Medium-voltage voltage transformers
Application and description
APPLICATION: Instrument voltage transformers are used to isolate measuring and protection devices from high voltage and to transform the voltage to a value suitable for measuring and protection devices.
DESCRIPTION: The transformer cores are made of high-quality cold-rolled magnetic steel with an oriented crystal structure. The primary and secondary windings are cast in epoxy resin filled with quartz sand, which gives an electrically and mechanically very strong construction. A special design of the windings ensures an even distribution of impulse overvoltages along the windings and over the surface of the insulating part of the transformer. Thanks to all these properties, and despite their small dimensions, these transformers withstand power-frequency voltage tests and impulse overvoltage tests excellently.
Since the core is made of very high-quality magnetic steel (low specific losses), there is no danger of impermissible heating of the core in a single-pole transformer at the high inductions that can occur in the event of an earth fault in an unearthed network.
Single-pole insulated voltage transformers also have an auxiliary residual winding (tertiary) for connection in an open delta, intended for earth-fault protection. An ohmic resistance in the circuit of the open-delta residual windings of three single-pole insulated voltage transformers connected in star in networks with an isolated neutral point prevents the occurrence and persistence of ferroresonance, which can arise during transient operating conditions of the network.
We manufacture voltage transformers for all climatic conditions.
Selection of accuracy class and version
SELECTING THE ACCURACY CLASS: The accuracy class of a voltage transformer should be selected according to its purpose.
- Class 0.1: for the most accurate laboratory measurements and calibrations;
- Class 0.2: for laboratory measurements and test stations, for the most accurate power measurements in operation and for revenue metering of electricity consumption at large consumers;
- Class 0.5: for operational voltage and power measurements, for metering electricity consumption and for supplying auxiliary relays;
- Class 1: for cases where a high rated output is required and a higher class is not necessary.
CONSUMPTION OF CONNECTING CONDUCTORS FOR DETERMINING THE RATED OUTPUT OF INSTRUMENT TRANSFORMERS: These data should be taken into account when selecting the rated output of instrument transformers, in addition to the consumption of the measuring or protection devices being connected.
| Load | Power consumption per system (W/m) |
|---|---|
| Cu conductor 1 m, 2.5 mm² at 5 A | 0.18 |
| Cu conductor 1 m, 4 mm² at 5 A | 0.11 |
| Cu conductor 1 m, 2.5 mm² at 1 A | 0.007 |
| Cu conductor 1 m, 4 mm² at 1 A | 0.0044 |
VERSIONS: We make transformers for indoor and outdoor installation. For indoor installation there are also versions with high-voltage fuse holders that can be mounted directly on the transformer. There are also reconnectable versions, where the transformer can be used for both 10 kV and 20 kV networks by special reconnection.
Filters
Single-pole voltage transformers 12-38 kV
Voltage: 12 kV, 24 kV, 38 kV | Mounting: Indoor / Outdoor | Insulation: Epoxy resin
To prevent ferroresonance, when single-pole voltage transformers are used in networks with an isolated neutral, an additional resistor must be installed in the tertiary circuit (the open delta of the transformers).
For transformers for indoor mounting, the housing and fuse are ordered separately, except for the model JNT SOP* in which they are integrated.
When ordering transformers, always state the primary, secondary and tertiary voltages, accuracy class and rated output. On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
Single-pole voltage transformers
JNT-12, JNT-24, JNT-24/12, JNT-36
Mounting: Indoor | Highest voltage for equipment: 12; 24; 36; 38 kV | Single-pole
We can also make these transformers for rated primary voltages: 3/√3; 5/√3; 6/√3; 15/√3; 17.5/√3; 25/√3 and 33/√3 kV.
| TECHNICAL DATA | JNT-12 | JNT-24 | JNT-24/12 | JNT-36 |
|---|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 20/√3 | 20/√3//10/√3 | 35/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | 24 | 38 (36) |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | |||
| Rated tertiary voltage (V) | 100/3 or 110/3 | |||
| Rated power-frequency withstand voltage (kV) | 28 | 50 | 50 | 70 |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | 125 | 170 |
| Rated frequency (Hz) | 50/60 | |||
| Maximum rated output for accuracy class 0.2 (VA) | 25 | 30 | 30/10 | 30 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 75 | 75/25 | 100 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 150 | 150/50 | 200 |
| Rated tertiary output (VA) | 25; 50; 100 | |||
| Rated tertiary accuracy class | 3P; 6P | |||
| Rated voltage factor | 1.9/8h | |||
| Additional resistance in the tertiary circuit (Ω) | 25 | 25 | 25 | 16.5 |
| Thermal limiting output (VA) | 600 | 600 | 600/300 | 800 |
| Mass (kg) | 24.6 | 31.5 | 32.5 | 41 |
| Insulation temperature class | E/B | |||
| Type of main insulation | Epoxy resin | |||
| Applicable standards | IEC 61869-1; IEC 61869-3 | |||
Dimensions (mm)
| Transformer type | Dimensions (mm) | ||||||
|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | |
| JNT-12 | 355 | 180 | 245 | 190 | 155 | 93 | 72 |
| JNT-24 | 375 | 200 | 298 | 210 | 175 | 93 | 72 |
| JNT-24/12 | 375 | 200 | 298 | 210 | 175 | 93 | 72 |
| JNT-36 | 385 | 225 | 389 | 245 | 200 | 74.5 | 65.5 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers with integrated housing
JNT SOP-12, JNT SOP-24, JNT SOP-24/12
Mounting: Indoor | Highest voltage for equipment: 12; 24 kV | Single-pole | Integrated fuse housing in the primary
JNT SOP transformers are suitable for installation in smaller cubicles up to the 24 kV voltage level. They have fuse housings on the high-voltage side, and with the transformer we supply the appropriate fuse cartridges, which are extremely easy to fit and remove.
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3 and 22/√3 kV.
| TECHNICAL DATA | JNT SOP-12 | JNT SOP-24 | JNT SOP-24/12 |
|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 20/√3 | 20/√3//10/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | 24 |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | ||
| Rated tertiary voltage (V) | 100/3 or 110/3 | ||
| Rated power-frequency withstand voltage (kV) | 28 | 50 | 50 |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | 125 |
| Rated frequency (Hz) | 50/60 | ||
| Maximum rated output for accuracy class 0.2 (VA) | 25 | 30 | 30/10 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 75 | 75/25 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 150 | 150/50 |
| Rated tertiary output (VA) | 25; 50; 100 | ||
| Rated tertiary accuracy class | 3P; 6P | ||
| Rated voltage factor | 1.9/8h | ||
| Additional resistance in the tertiary circuit (Ω) | 25 | ||
| Thermal limiting output (VA) | 600 | 600 | 600/300 |
| Mass (kg) | 23 | 29 | 30.5 |
| Insulation temperature class | E/B | ||
| Type of main insulation | Epoxy resin | ||
| Applicable standards | IEC 61869-1; IEC 61869-3 | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | |||||||
|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | H | |
| JNT SOP-12 | 533 | 240 | 280 | 353 | 270 | 125 | 312 | 148 |
| JNT SOP-24 | 606 | 300 | 340 | 416 | 275 | 130 | 325 | 178 |
| JNT SOP-24/12 | 606 | 300 | 340 | 416 | 275 | 130 | 325 | 178 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers of reduced dimensions
JNT-10, JNT-10U, JNT-20U, JNT-30U
Mounting: Indoor | Highest voltage for equipment: 12; 24; 36; 42 kV | Single-pole
We can also make these transformers for rated primary voltages: 3/√3; 5/√3; 6/√3; 15/√3; 17.5/√3; 25/√3 and 33/√3 kV.
| TECHNICAL DATA | JNT-10 | JNT-10U | JNT-20U | JNT-30U |
|---|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 10/√3 | 20/√3 | 35/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 12 | 24 | 36 (42) |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | |||
| Rated tertiary voltage (V) | 100/3 or 110/3 | |||
| Rated power-frequency withstand voltage (kV) | 28 | 28 (42) | 50 (65) | 70 (95) |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 75 | 125 | 170 (190) |
| Rated frequency (Hz) | 50/60 | |||
| Maximum rated output for accuracy class 0.2 (VA) | 15 | 30 | 30 | 30 |
| Maximum rated output for accuracy class 0.5 (VA) | 50 | 75 | 75 | 75 |
| Maximum rated output for accuracy class 1 (VA) | 100 | 150 | 150 | 150 |
| Rated tertiary output (VA) | 25; 50; 100 | 10-50 | 10-50 | 10-50 |
| Rated tertiary accuracy class | 3P; 6P | 3P; 6P | 3P; 6P | 3P; 6P |
| Rated voltage factor | 1.9/8h | 1.9/8h | 1.9/8h | 1.9/8h |
| Additional resistance in the tertiary circuit (Ω) | 25 | 25 | 25 | 25 |
| Thermal limiting output (VA) | 400 | 600 | 600 | 800 |
| Mass (kg) | 17 | 30 | 43 | 60 |
| Insulation temperature class | E/B | |||
| Type of main insulation | Epoxy resin | |||
| Applicable standards | IEC 61869-1; IEC 61869-3 | IEC 61869-1; IEC 61869-3; GOST 1983 | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | I | J | |
| JNT-10 | 320 | 148 | 237 | 210 | 115 | 81 | 19 | M8 | 11 |
| JNT-10U | 275 | 220 | 251 | 215 | 180 | 30 | 30 | M10 | 13 |
| JNT-20U | 315 | 242 | 290 | 240 | 207 | 37.5 | 37.5 | M10 | 13 |
| JNT-30U | 415 | 250 | 390 | 300 | 225 | 90 | 25 | M10 | 13 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers of reduced dimensions
JNT-10d, JNTm2-24, JNTm2-24/12
Mounting: Indoor | Highest voltage for equipment: 12; 24 kV | Single-pole
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3 and 22/√3 kV.
| TECHNICAL DATA | JNT-10d | JNTm2-24 | JNTm2-24/12 |
|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 20/√3 | 20/√3//10/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | 24 |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | ||
| Rated tertiary voltage (V) | 100/3 or 110/3 | ||
| Rated power-frequency withstand voltage (kV) | 28 | 50 | 50 |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | 125 |
| Rated frequency (Hz) | 50/60 | ||
| Maximum rated output for accuracy class 0.2 (VA) | 15 | 15 | - |
| Maximum rated output for accuracy class 0.5 (VA) | 50 | 50 | 50/15 |
| Maximum rated output for accuracy class 1 (VA) | 100 | 100 | 75/25 |
| Rated tertiary output (VA) | 25; 50; 100 | ||
| Rated tertiary accuracy class | 3P; 6P | ||
| Rated voltage factor | 1.9/8h | ||
| Additional resistance in the tertiary circuit (Ω) | 25 | 25 | 25 |
| Thermal limiting output (VA) | 400 | 400 | 400/200 |
| Mass (kg) | 21 | 27 | 27 |
| Insulation temperature class | E/B | ||
| Type of main insulation | Epoxy resin | ||
| Applicable standards | IEC 61869-1; IEC 61869-3 | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | I | J | |
| JNT-10d | 340 | 148 | 220 | 270 | 125 | 53 | 17 | M10 | 11 |
| JNTm2-24 | 355 | 178 | 271 | 280 | 150 | 53 | 22 | M10 | 14 |
| JNTm2-24/12 | 355 | 178 | 271 | 280 | 150 | 53 | 22 | M10 | 14 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers of reduced dimensions - BLOCK TYPE
REL 10, REL 20, REL 20/10
Mounting: Indoor | Highest voltage for equipment: 12; 24 kV | Single-pole | Block type
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3 and 22/√3 kV.
| TECHNICAL DATA | REL 10 | REL 20 | REL 20/10 |
|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 20/√3 | 20/√3//10/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | 24 |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | ||
| Rated tertiary voltage (V) | 100/3 or 110/3 | ||
| Rated power-frequency withstand voltage (kV) | 28 (42) | 50 (65) | 50 (65) |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | 125 |
| Rated frequency (Hz) | 50/60 | ||
| Maximum rated output for accuracy class 0.2 (VA) | 15 | 15 | 10(5) |
| Maximum rated output for accuracy class 0.5 (VA) | 50 | 50 | 30(15) |
| Maximum rated output for accuracy class 1 (VA) | 100 | 120 | 120(50) |
| Rated tertiary output (VA) | 10-50 | ||
| Rated tertiary accuracy class | 3P; 6P | ||
| Rated voltage factor | 1.9/8h | ||
| Additional resistance in the tertiary circuit (Ω) | 50 | ||
| Thermal limiting output (VA) | 400 | 400 | 400/200 |
| Insulation temperature class | E | ||
| Type of main insulation | Epoxy resin | ||
| Applicable standards | IEC 61869-1; IEC 61869-3 (GOST 1983) | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | Mass (kg) | ||||||
|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | ||
| REL 10 | 325 | 148 | 200 | 125 | 260 | 15 | 11 | ~18.5 |
| REL 20 | 351 | 178 | 230 | 150 | 275 | 20 | 14 | ~25 |
| REL 20/10 | 351 | 178 | 230 | 150 | 275 | 20 | 14 | ~25 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers of reduced dimensions - BLOCK TYPE
JNT-12z, JNT-12d, JNT-24z, JNT-24d, JNT-24/12z, JNT-24/12d
Mounting: Indoor | Highest voltage for equipment: 12; 24 kV | Single-pole | Block type
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3 and 22/√3 kV.
| TECHNICAL DATA | JNT-12z | JNT-12d | JNT-24z | JNT-24d | JNT-24/12z | JNT-24/12d |
|---|---|---|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 10/√3 | 20/√3 | 20/√3 | 20/√3//10/√3 | 20/√3//10/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 12 | 24 | 24 | 24 | 24 |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | |||||
| Rated tertiary voltage (V) | 100/3 or 110/3 | |||||
| Rated power-frequency withstand voltage (kV) | 28 | 28 | 50 | 50 | 50 | 50 |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 75 | 125 | 125 | 125 | 125 |
| Rated frequency (Hz) | 50/60 | |||||
| Maximum rated output for accuracy class 0.2 (VA) | 25 | 25 | 30 | 30 | 30/10 | 30/10 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 75 | 75 | 75 | 75/25 | 75/25 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 150 | 150 | 150 | 150/50 | 150/50 |
| Rated tertiary output (VA) | 25; 50; 100 | |||||
| Rated tertiary accuracy class | 3P; 6P | |||||
| Rated voltage factor | 1.9/8h | |||||
| Additional resistance in the tertiary circuit (Ω) | 25 | 25 | 25 | 25 | 25 | 25 |
| Thermal limiting output (VA) | 500 | 600 | 600 | 700 | 600/300 | 700/350 |
| Mass (kg) | 24.6 | 24.6 | 31.5 | 33 | 32.5 | 34.5 |
| Insulation temperature class | E/B | |||||
| Type of main insulation | Epoxy resin | |||||
| Applicable standards | IEC 61869-1; IEC 61869-3; DIN 42600-9 | |||||
Dimensions (mm)
| Transformer type | Dimensions (mm) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | H | I | K | J | |
| JNT-12z | 348 | 148 | 234 | 270 | 125 | 48 | 15 | 152 | 150 | 183 | Ø12, Ø14 |
| JNT-12d | 358 | 148 | 234 | 275 | 125 | 55 | 15 | 162 | 150 | 195 | Ø12, Ø14 |
| JNT-24z | 368 | 178 | 293 | 280 | 150 | 53 | 20 | 162 | 160 | 193 | Ø12, Ø14 |
| JNT-24d | 392 | 178 | 293 | 275 | 150 | 70 | 32 | 174 | 172 | 205 | Ø12, Ø14 |
| JNT-24/12z | 368 | 178 | 293 | 280 | 150 | 53 | 20 | 162 | 160 | 193 | Ø12, Ø14 |
| JNT-24/12d | 392 | 178 | 293 | 275 | 150 | 70 | 32 | 174 | 172 | 205 | Ø12, Ø14 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers of reduced dimensions - BLOCK TYPE
JNT-38z, JNT-38d, JNT-36d
Mounting: Indoor | Highest voltage for equipment: 36; 38; 40.5 kV | Single-pole | Block type
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3; 22/√3 and 30/√3 kV.
| TECHNICAL DATA | JNT-38z | JNT-38d | JNT-36d |
|---|---|---|---|
| Rated primary voltage (kV) | 35/√3 | 35/√3 | 35/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 38 | 38 (40.5) | 36, 38 (40.5) |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | ||
| Rated tertiary voltage (V) | 100/3 or 110/3 | ||
| Rated power-frequency withstand voltage (kV) | 70 | 70 (80) | 70 (80) |
| Rated impulse voltage 1.2/50 µs (kV) | 170 | 170 (190) | 170 (190) |
| Rated frequency (Hz) | 50/60 | ||
| Maximum rated output for accuracy class 0.2 (VA) | 25 | 30 | 50 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 100 | 150 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 200 | 300 |
| Rated tertiary output (VA) | 25; 50; 100 | 25; 50; 100; 150 | |
| Rated tertiary accuracy class | 3P; 6P | ||
| Rated voltage factor | 1.9/8h | ||
| Additional resistance in the tertiary circuit (Ω) | 25 | 25 (16.7) | 16.7 (12.5) |
| Thermal limiting output (VA) | 600 | 800 | 1200 |
| Mass (kg) | 34 | 40 | 72 |
| Insulation temperature class | E/B | ||
| Type of main insulation | Epoxy resin | ||
| Applicable standards | IEC 61869-1; IEC 61869-3 | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | F | G | H | I | K | |
| JNT-38z | 368 | 210 | 342 | 245 | 70.5 | 37.5 | 162 | 160 | 193 |
| JNT-38d | 392 | 220 | 384 | 245 | 82.5 | 49.5 | 174 | 172 | 205 |
| JNT-36d | 443 | 240 | 376 | 300 | 88 | 40 | 207 | 190 | 238 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers for outdoor mounting
JNT SM-12, JNT SM-24, JNT SM-24/12, JNT SM-36*
Mounting: Outdoor | Highest voltage for equipment: 12; 24; 36; 38 kV | Single-pole
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3; 22/√3 and 30/√3 kV.
| TECHNICAL DATA | JNT SM-12 | JNT SM-24 | JNT SM-24/12 | JNT SM-36* |
|---|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 20/√3 | 20/√3//10/√3 | 35/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | 24 | 38 (36) |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | |||
| Rated tertiary voltage (V) | 100/3 or 110/3 | |||
| Rated power-frequency withstand voltage (kV) | 28 | 50 | 50 | 70 |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | 125 | 170 |
| Rated frequency (Hz) | 50/60 | |||
| Maximum rated output for accuracy class 0.2 (VA) | 25 | 30 | 30/10 | 30 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 75 | 75/25 | 100 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 150 | 150/50 | 200 |
| Rated tertiary output (VA) | 25; 50; 100 | |||
| Rated tertiary accuracy class | 3P; 6P | |||
| Rated voltage factor | 1.9/8h | |||
| Additional resistance in the tertiary circuit (Ω) | 25 | 25 | 25 | 16.5 |
| Thermal limiting output (VA) | 600 | 600 | 600/300 | 800 |
| Mass (kg) | 25.9 | 31.5 | 32.5 | 43 |
| Insulation temperature class | E/B | |||
| Type of main insulation | Epoxy resin | |||
| Applicable standards | IEC 61869-1; IEC 61869-3 | |||
Dimensions (mm)
| Transformer type | Dimensions (mm) | Number of sheds | Creepage distance (mm) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | |||
| JNT SM-12 | 366 | 190 | 367 | 209 | 165 | 98 | 21 | 3 | 500 |
| JNT SM-24 | 370 | 190 | 447 | 220 | 165 | 90.5 | 27.5 | 4 | 630 |
| JNT SM-24/12 | 370 | 190 | 447 | 220 | 165 | 90.5 | 27.5 | 4 | 630 |
| JNT SM-36-5R | 379 | 225 | 549 | 229 | 200 | 92 | 25 | 5 | 855 |
| JNT SM-36-6R | 379 | 225 | 579 | 229 | 200 | 92 | 25 | 6 | 920 |
| JNT SM-36-8R | 379 | 225 | 626 | 229 | 200 | 92 | 25 | 8 | 1125 |
| JNT SM-36-10R | 379 | 225 | 695 | 229 | 200 | 92 | 25 | 10 | 1280 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
* - applies to all models of that type (JNT SM-36-5R, JNT SM-36-6R, JNT SM-36-8R, JNT SM-36-10R).
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers for outdoor mounting 12-42 kV
NTSM-12, NTSM-24, NTSM-38
Mounting: Outdoor | Highest voltage for equipment: 12; 24; 36; 42 kV | Single-pole | Cycloaliphatic resin
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3; 22/√3 and 30/√3 kV.
| TECHNICAL DATA | NTSM-12 | NTSM-24 | NTSM-38 |
|---|---|---|---|
| Rated primary voltage (kV) | 10/√3 | 20/√3 | 35/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | 36 (42) |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | ||
| Rated tertiary voltage (V) | 100/3 or 110/3 | ||
| Rated power-frequency withstand voltage (kV) | 28 (42) | 50 (65) | 70 (95) |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | 170 (190) |
| Rated frequency (Hz) | 50/60 | ||
| Maximum rated output for accuracy class 0.2 (VA) | 15 | 15 | 20 |
| Maximum rated output for accuracy class 0.5 (VA) | 50 | 50 | 75 |
| Maximum rated output for accuracy class 1 (VA) | 100 | 120 | 150 |
| Rated tertiary output (VA) | 10-50 | ||
| Rated tertiary accuracy class | 3P; 6P | ||
| Rated voltage factor | 1.9/8h | ||
| Additional resistance in the tertiary circuit (Ω) | 25-50 | ||
| Thermal limiting output (VA) | 600 | ||
| Insulation temperature class | F | ||
| Type of main insulation | Cycloaliphatic resin | ||
| Applicable standards | IEC 61869-1; IEC 61869-3 (GOST 1983) | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | Mass (kg) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | I | ||
| NTSM-12 | 315 | 372 | Pg16 | 280 | 276 | 224 | 224 | 14 | ~40 |
| NTSM-24 | 315 | 450 | Pg16 | 280 | 276 | 224 | 224 | 14 | ~58 |
| NTSM-38 | 315 | 520 | Pg16 | 280 | 276 | 224 | 224 | 14 | ~72 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers of reduced rated output
JNT SM-10
Mounting: Outdoor | Highest voltage for equipment: 12 kV | Single-pole
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3 and 11/√3 kV.
| TECHNICAL DATA | JNT SM-10 |
|---|---|
| Rated primary voltage (kV) | 10/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 |
| Rated secondary voltage (V) | 100/√3 or 110/√3 |
| Rated tertiary voltage (V) | 100/3 or 110/3 |
| Rated power-frequency withstand voltage (kV) | 28 |
| Rated impulse voltage 1.2/50 µs (kV) | 75 |
| Rated frequency (Hz) | 50/60 |
| Maximum rated output for accuracy class 0.2 (VA) | 15 |
| Maximum rated output for accuracy class 0.5 (VA) | 50 |
| Maximum rated output for accuracy class 1 (VA) | 100 |
| Rated tertiary output (VA) | 25; 50; 100 |
| Rated tertiary accuracy class | 3P; 6P |
| Rated voltage factor | 1.9/8h |
| Additional resistance in the tertiary circuit (Ω) | 25 |
| Thermal limiting output (VA) | 400 |
| Creepage distance (mm) | 465 |
| Mass (kg) | 18.2 |
| Insulation temperature class | E/B |
| Type of main insulation | Epoxy resin |
| Applicable standards | IEC 61869-1; IEC 61869-3 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Single-pole voltage transformers of reduced rated output
JNTm2 SM-24, JNTm2 SM-24/12
Mounting: Outdoor | Highest voltage for equipment: 24 kV | Single-pole
We can also make these transformers for primary voltages: 3/√3; 5/√3; 6/√3; 11/√3; 15/√3 and 22/√3 kV.
| TECHNICAL DATA | JNTm2 SM-24 | JNTm2 SM-24/12 |
|---|---|---|
| Rated primary voltage (kV) | 20/√3 | 20/√3//10/√3 |
| Highest voltage for equipment (r.m.s.) (kV) | 24 | |
| Rated secondary voltage (V) | 100/√3 or 110/√3 | |
| Rated tertiary voltage (V) | 100/3 or 110/3 | |
| Rated power-frequency withstand voltage (kV) | 50 | |
| Rated impulse voltage 1.2/50 µs (kV) | 125 | |
| Rated frequency (Hz) | 50/60 | |
| Maximum rated output for accuracy class 0.2 (VA) | 15 | - |
| Maximum rated output for accuracy class 0.5 (VA) | 50 | 50/15 |
| Maximum rated output for accuracy class 1 (VA) | 100 | 75/25 |
| Rated tertiary output (VA) | 25; 50; 100 | |
| Rated tertiary accuracy class | 3P; 6P | |
| Rated voltage factor | 1.9/8h | |
| Additional resistance in the tertiary circuit (Ω) | 25 | |
| Thermal limiting output (VA) | 400 | 400/200 |
| Creepage distance (mm) | 535 | |
| Mass (kg) | 27.5 | 28 |
| Insulation temperature class | E/B | |
| Type of main insulation | Epoxy resin | |
| Applicable standards | IEC 61869-1; IEC 61869-3 | |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary, secondary and tertiary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole voltage transformers 12-38 kV
Voltage: 12 kV, 24 kV, 38 kV | Mounting: Indoor / Outdoor | Insulation: Epoxy resin
When ordering, always state the primary and secondary voltages, accuracy class and rated output.
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
Double-pole auxiliary power transformers
DNT-24E
Mounting: Indoor | Highest voltage for equipment: 7.2; 12; 17.5; 24 kV | Double-pole | Auxiliary power transformer
We can also make these transformers for primary voltages: 3; 5; 6; 15; 17.5 and 22 kV.
During installation, pay attention to the connections according to these instructions.
Incorrect connection can cause damage to the transformer and injury.
Terminal "a" MUST NOT be connected to earth - THIS CAUSES A SHORT CIRCUIT AND DAMAGE to the transformer if terminal "b" in the secondary terminal box is connected to the base with an M5x20 screw at point 2.
| TECHNICAL DATA | DNT-24E | |||
|---|---|---|---|---|
| Rated primary voltage (kV) | 6 | 10 | 15 | 20 |
| Highest voltage for equipment (r.m.s.) (kV) | 7.2 | 12 | 17.5 | 24 |
| Rated secondary voltage (V) | 220 or 230 | |||
| Rated power-frequency withstand voltage, 1 min (kV) | 20 | 28 | 38 | 50 |
| Rated impulse voltage 1.2/50 µs (kV) | 60 | 75 | 95 | 125 |
| Rated frequency (Hz) | 50/60 | |||
| Thermal limiting output (VA) | 2500 | 2500 | 2000 | 2000 |
| Rated voltage factor Vf | 1.2 continuous | |||
| Mass (kg) | 38.5 | 39 | 40 | 40 |
| Insulation temperature class | E/B | |||
| Type of main insulation | Epoxy resin | |||
| Applicable standards | IEC 60076-1; IEC 61869-1; IEC 61869-3 | |||
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole auxiliary power transformers
DNT-36
Mounting: Indoor | Highest voltage for equipment: 7.2; 12; 24; 36 kV | Double-pole | Auxiliary power transformer
We can also make these transformers for primary voltages: 3; 5; 6; 15; 17.5; 25 and 33 kV.
| TECHNICAL DATA | DNT-36 | |||
|---|---|---|---|---|
| Rated primary voltage (kV) | 6 | 10 | 20 | 35 |
| Highest voltage for equipment (r.m.s.) (kV) | 7.2 | 12 | 24 | 36 |
| Rated secondary voltage (V) | 220 or 230 | |||
| Rated power-frequency withstand voltage, 1 min (kV) | 20 | 28 | 50 | 70 |
| Rated impulse voltage 1.2/50 µs (kV) | 60 | 75 | 125 | 170 |
| Rated frequency (Hz) | 50/60 | |||
| Thermal limiting output (VA) | 5000 | 5000 | 4000 | 2500 |
| Rated voltage factor Vf | 1.2 continuous | |||
| Mass (kg) | 58.5 | 59 | 62 | 64 |
| Insulation temperature class | E/B | |||
| Type of main insulation | Epoxy resin | |||
| Applicable standards | IEC 60076-1; IEC 61869-1; IEC 61869-3 | |||
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole voltage transformers
DNT-12, DNTm1-24, DNT-24, DNT-24/12, DNT-36
Mounting: Indoor | Highest voltage for equipment: 12; 24; 36; 38 kV | Double-pole
We can also make these transformers for primary voltages: 3; 4; 6; 11; 15; 22 and 30 kV.
The DNTm1-24 voltage transformer is a version with reduced rated output and smaller dimensions, which makes it suitable for smaller cubicles.
| TECHNICAL DATA | DNT-12 | DNTm1-24 | DNT-24 | DNT-24/12 | DNT-36 |
|---|---|---|---|---|---|
| Rated primary voltage (kV) | 10 | 20 | 20 | 20/10 | 35 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | 24 | 24 | 38 (36) |
| Rated secondary voltage (V) | 100 or 110 | ||||
| Rated power-frequency withstand voltage (kV) | 28 | 50 | 50 | 50 | 70 |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | 125 | 125 | 170 |
| Rated frequency (Hz) | 50/60 | ||||
| Maximum rated output for accuracy class 0.2 (VA) | 25 | 15 | 30 | 30/10 | 30 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 50 | 75 | 75/25 | 100 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 100 | 150 | 150/50 | 200 |
| Rated voltage factor | 1.2 / continuous | ||||
| Thermal limiting output (VA) | 600 | 400 | 600 | 600/300 | 800 |
| Mass (kg) | 27.4 | 28 | 34.5 | 35.5 | 58 |
| Insulation temperature class | E/B | ||||
| Type of main insulation | Epoxy resin | ||||
| Applicable standards | IEC 61869-1; IEC 61869-3 | ||||
Dimensions (mm)
| Transformer type | Dimensions (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | H | I | |
| DNT-12 | 355 | 180 | 246 | 190 | 155 | 93 | 72 | 150 | 198 |
| DNTm1-24 | 355 | 180 | 300 | 190 | 155 | 93 | 72 | 210 | 246 |
| DNT-24 | 375 | 200 | 300 | 210 | 175 | 93 | 72 | 210 | 246 |
| DNT-24/12 | 375 | 200 | 300 | 210 | 175 | 93 | 72 | 210 | 246 |
| DNT-36 | 430 | 250 | 397 | 300 | 225 | 76 | 54 | 320 | 364 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole voltage transformers of reduced dimensions - BLOCK TYPE
RZL 10, RZL 20, RZL 20/10
Mounting: Indoor | Highest voltage for equipment: 12; 24 kV | Double-pole | Block type
We can also make these transformers for primary voltages: 3; 5; 6; 11; 15 and 22 kV.
| TECHNICAL DATA | RZL 10 | RZL 20 | RZL 20/10 |
|---|---|---|---|
| Rated primary voltage (kV) | 10 | 20 | 20/10 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | |
| Rated secondary voltage (V) | 100; 110 or 230 | ||
| Rated power-frequency withstand voltage (kV) | 28 (42) | 50 (65) | |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | |
| Rated frequency (Hz) | 50/60 | ||
| Maximum rated output for accuracy class 0.2 (VA) | 10 | 15 | 10(5) |
| Maximum rated output for accuracy class 0.5 (VA) | 30 | 50 | 30(15) |
| Maximum rated output for accuracy class 1 (VA) | 100 | 120 | 120(50) |
| Rated voltage factor | 1.2 / continuous | ||
| Thermal limiting output (VA) | 400 | ||
| Insulation temperature class | E | ||
| Type of main insulation | Epoxy resin | ||
| Applicable standards | IEC 61869-1; IEC 61869-3 (GOST 1983) | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | Mass (kg) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | H | O | ||
| RZL 10 | 325 | 148 | 200 | 125 | 260 | 15 | 11 | 102 | 110 | ~18.5 |
| RZL 20 | 351 | 178 | 230 | 150 | 275 | 20 | 14 | 165 | 130 | ~25 |
| RZL 20/10 | 351 | 178 | 230 | 150 | 275 | 20 | 14 | 165 | 130 | ~26 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole voltage transformers for outdoor mounting
DNT SM-17.5, DNT SM-24, DNT SM-24/12,
DNT SM-36, DNT SM-36S, DNT SM-36-8R, DNT SM-36-10R
Mounting: Outdoor | Highest voltage for equipment: 12; 17.5; 24; 38; 40.5 kV | Double-pole
We can also make these transformers for primary voltages: 3; 5; 6.3; 11; 15; 22 and 30 kV.
| TECHNICAL DATA | DNT SM-17.5 | DNT SM-24 | DNT SM-24/12 | DNT SM-36 | DNT SM-36S | DNT SM-36-8R | DNT SM-36-10R |
|---|---|---|---|---|---|---|---|
| Rated primary voltage (kV) | 15 (10) | 20 | 20/10 | 35 | 35 | 35 | 35 |
| Highest voltage for equipment (r.m.s.) (kV) | 17.5 (12) | 24 | 24 | 38 | 38 | 40.5 | 40.5 |
| Rated secondary voltage (V) | 100 or 110 | ||||||
| Rated power-frequency withstand voltage (kV) | 38 (28) | 50 | 50 | 70 | 70 | 80 | 80 |
| Rated impulse voltage 1.2/50 µs (kV) | 95 (75) | 125 | 125 | 170 | 170 | 190 | 190 |
| Rated frequency (Hz) | 50/60 | ||||||
| Maximum rated output for accuracy class 0.2 (VA) | 25 | 30 | 30/10 | 30 | 30 | 30 | 30 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 75 | 75/25 | 100 | 100 | 100 | 100 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 150 | 150/50 | 200 | 200 | 200 | 200 |
| Rated voltage factor | 1.2 / continuous | ||||||
| Thermal limiting output (VA) | 600 | 600 | 600/300 | 800 | 800 | 800-1200 | 800-1200 |
| Mass (kg) | 27.6 | 36 | 37 | 60 | 53 | 63 | 66 |
| Insulation temperature class | E/B | ||||||
| Type of main insulation | Epoxy resin | ||||||
| Applicable standards | IEC 61869-1; IEC 61869-3 | ||||||
Dimensions (mm)
| Transformer type | Dimensions (mm) | Number of sheds | Creepage distance (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | H | I | |||
| DNT SM-17.5 | 360 | 190 | 367 | 207 | 165 | 94 | 28 | 210 | 292 | 3 | 500 |
| DNT SM-24 | 373 | 190 | 449 | 220 | 165 | 94 | 31 | 320 | 406 | 4 | 650 |
| DNT SM-24/12 | 373 | 190 | 449 | 220 | 165 | 94 | 31 | 320 | 406 | 4 | 650 |
| DNT SM-36 | 425 | 225 | 551 | 270 | 200 | 96 | 33 | 430 | 520 | 5 | 900 |
| DNT SM-36S | 410 | 225 | 506 | 260 | 200 | 91 | 28 | 430 | 515 | 6 | 900 |
| DNT SM-36-8R | 425 | 225 | 613 | 270 | 200 | 96 | 33 | 490 | 573 | 8 | 1152 |
| DNT SM-36-10R | 425 | 225 | 676 | 270 | 200 | 96 | 33 | 536 | 613 | 10 | 1320 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole voltage transformers for outdoor mounting 12-24 kV
NTDSM-12, NTDSM-24, NTDSM-24/12
Mounting: Outdoor | Highest voltage for equipment: 12; 24 kV | Double-pole | Cycloaliphatic resin
We can also make these transformers for primary voltages: 3; 5; 6; 11; 15 and 22 kV.
| TECHNICAL DATA | NTDSM-12 | NTDSM-24 | NTDSM-24/12 |
|---|---|---|---|
| Rated primary voltage (kV) | 10 | 20 | 20/10 |
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | |
| Rated secondary voltage (V) | 100; 110 or 230 | ||
| Rated power-frequency withstand voltage (kV) | 28 (42) | 50 (65) | |
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | |
| Rated frequency (Hz) | 50/60 | ||
| Maximum rated output for accuracy class 0.2 (VA) | 15 | 15 | 10(5) |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 75 | 30(15) |
| Maximum rated output for accuracy class 1 (VA) | 150 | 150 | 120(50) |
| Rated voltage factor | 1.2 / continuous | ||
| Thermal limiting output (VA) | 600 | ||
| Insulation temperature class | F | ||
| Type of main insulation | Cycloaliphatic resin | ||
| Applicable standards | IEC 61869-1; IEC 61869-3 (GOST 1983) | ||
Dimensions (mm)
| Transformer type | Dimensions (mm) | Mass (kg) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | H | I | O | R | ||
| NTDSM-12 | 320 | 220 | 315 | 370 | 303 | 270 | 183 | 215 | 27.5 | 13 | 25 | ~32 |
| NTDSM-24 | 350 | 242 | 430 | 449 | 368 | 300 | 207 | 240 | 30 | 13 | 25 | ~48 |
| NTDSM-24/12 | 350 | 242 | 430 | 449 | 368 | 300 | 207 | 240 | 30 | 13 | 25 | ~49 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole voltage transformers for outdoor mounting 12-24 kV
NTDSM-0.63-12, NTDSM-1.25-12,
NTDSM-0.63-24, NTDSM-1.25-24
Mounting: Outdoor | Highest voltage for equipment: 12; 24 kV | Double-pole | Cycloaliphatic resin
We can also make these transformers for primary voltages: 3; 5; 6; 11; 15 and 22 kV.
| TECHNICAL DATA | NTDSM-0.63-12 | NTDSM-1.25-12 | NTDSM-0.63-24 | NTDSM-1.25-24 |
|---|---|---|---|---|
| Rated primary voltage (kV) | 3; 6; 10 | 10; 15; 20 | ||
| Highest voltage for equipment (r.m.s.) (kV) | 12 | 24 | ||
| Rated secondary voltage (V) | 218; 224; 230; 236; 242 | |||
| Rated power-frequency withstand voltage (kV) | 28 | 50 | ||
| Rated impulse voltage 1.2/50 µs (kV) | 75 | 125 | ||
| Rated frequency (Hz) | 50/60 | |||
| Rated output (VA) | 630 | 1250 | ||
| No-load losses (W) | 50 | 50 | ||
| Short-circuit voltage (%) | 4.5 | 4.5±10 | ||
| Load losses (W) | 55 | 50 | ||
| Rated voltage factor | 1.2 / continuous | |||
| Insulation temperature class | E | |||
| Type of main insulation | Cycloaliphatic resin | |||
| Applicable standards | IEC 61869-1; IEC 61869-3 (GOST 1983) | |||
Dimensions (mm)
| Transformer type | Dimensions (mm) | Mass (kg) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | H | I | O | R | ||
| NTDSM-0.63-12 | 320 | 220 | 315 | 370 | 303 | 270 | 183 | 215 | 27.5 | 13 | 25 | ~32 |
| NTDSM-1.25-12 | 320 | 220 | 315 | 370 | 303 | 270 | 183 | 215 | 27.5 | 13 | 25 | ~34 |
| NTDSM-0.63-24 | 350 | 242 | 430 | 449 | 368 | 300 | 207 | 240 | 30 | 13 | 25 | ~48 |
| NTDSM-1.25-24 | 350 | 242 | 430 | 449 | 368 | 300 | 207 | 240 | 30 | 13 | 25 | ~50 |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Double-pole voltage transformers for outdoor mounting
NTDSM-24h, NTDSM-24/12h
Mounting: Outdoor | Highest voltage for equipment: 24 kV | Double-pole
We can also make these transformers for primary voltages: 3; 5; 6; 6.3; 11; 15 and 22 kV.
| TECHNICAL DATA | NTDSM-24h | NTDSM-24/12h |
|---|---|---|
| Rated primary voltage (kV) | 20 | 20/10 |
| Highest voltage for equipment (r.m.s.) (kV) | 24 | 24 |
| Rated secondary voltage (V) | 100; 110 or 230 | |
| Rated power-frequency withstand voltage (kV) | 50 | 50 |
| Rated impulse voltage 1.2/50 µs (kV) | 125 | 125 |
| Rated frequency (Hz) | 50/60 | |
| Maximum rated output for accuracy class 0.2 (VA) | 30 | 30/10 |
| Maximum rated output for accuracy class 0.5 (VA) | 75 | 75/25 |
| Maximum rated output for accuracy class 1 (VA) | 150 | 150/50 |
| Rated voltage factor | 1.2 / continuous | |
| Thermal limiting output (VA) | 600 | 600/300 |
| Mass (kg) | 36 | 37 |
| Insulation temperature class | E/B | |
| Type of main insulation | Epoxy resin | |
| Applicable standards | IEC 61869-1; IEC 61869-3 | |
On customer request, we can also make other combinations of rated transformation ratios, accuracy classes, rated outputs and voltage factors.
When ordering, always state the primary and secondary voltages, accuracy class and rated output. We reserve the right to make changes.
Accessories for voltage transformers
Residual winding resistors / High-voltage fuse housings
Resistors for suppressing ferroresonance in the open-delta (tertiary) circuit of single-pole voltage transformers, and high-voltage fuse housings for mounting on voltage transformers.
Ferroresonance suppression resistor for indoor mounting
ORN-25/400, ORN-16.7/600
Mounting: Indoor | Residual (tertiary) winding resistor | For 10, 20 and 35 kV voltage transformers
To prevent ferroresonance, when single-pole voltage transformers are used in networks with an isolated neutral, a 25 Ω (400 W) resistor must be installed in the open-delta circuit for 10 and 20 kV transformers, and a 16-20 Ω (600 W) resistor for 35 kV transformers. This significantly reduces the risk of ferroresonance.
| Resistor type | For FMT voltage transformers | Power | Resistance | L (mm) | A (mm) |
|---|---|---|---|---|---|
| ORN-25/400 | 10 and 20 kV | 400 W | 25 Ω | 322 | 305 |
| ORN-16.7/600 | 35 kV | 600 W | 16.7 Ω | 432 | 415 |
Ferroresonance suppression resistor for outdoor mounting
ORN SM-25/400, ORN SM-16.7/600
Mounting: Outdoor | Residual (tertiary) winding resistor | For 10, 20 and 35 kV voltage transformers
To prevent ferroresonance, when single-pole voltage transformers are used in networks with an isolated neutral, a 25 Ω; 400 W resistor must be installed in the open-delta circuit for 10 and 20 kV transformers, and a (16-20) Ω; 600 W resistor for 35 kV transformers. This significantly reduces the risk of ferroresonance.
These resistors are always installed as standard, without the need to specify them, in the medium-voltage three-system metering units manufactured by FMT.
| Resistor type | For FMT voltage transformers | Power | Resistance | L (mm) | A (mm) |
|---|---|---|---|---|---|
| ORN SM-25/400 | 10 and 20 kV | 400 W | 25 Ω | 290 | 210 |
| ORN SM-16.7/600 | 35 kV | 600 W | 16.7 Ω | 400 | 320 |
The cable length is 2 m, or according to customer request.
High-voltage fuse housings
FT-12, FT-24, FT-36
Mounting on the voltage transformer: vertical or horizontal | For 10, 20 and 35 kV networks
FT fuse housings can be mounted on the voltage transformer in a vertical or horizontal position using an adapter that we supply.
On special customer request, the housings are supplied with or without fuse cartridges.
| Housing type | Rated voltage (kV) | A (mm) | B (mm) | Fuse dimensions (mm) | Mass of housing without fuse (kg) |
|---|---|---|---|---|---|
| FT-12 | 10 | 179 | 137 | Ø60x160 | 0.8 |
| FT-24 | 20 | 284 | 242 | Ø60x265 | 1.06 |
| FT-36 | 35 | 380 | 338 | Ø60x358 | 1.44 |
High-voltage fuse housings
KO VVC12kV, KO VVC24kV, KO VVC36kV (VVC-*)
Mounting on the voltage transformer: vertical only | For 10, 20 and 35 kV networks
VVC fuse housings can be mounted on the voltage transformer in a vertical position only.
On special customer request, the housings are supplied with or without fuse cartridges.
| Housing type | Rated voltage (kV) | A (mm) | H (mm) | Fuse dimensions (mm) | Mass of housing without fuse (kg) |
|---|---|---|---|---|---|
| KO VVC12kV | 10 | 314 | 339 | Ø53x192 | 1.93 |
| KO VVC24kV | 20 | 414 | 439 | Ø53x292 | 2.33 |
| KO VVC36kV | 35 | 564 | 589 | Ø53x442 | 2.88 |
Examples of fuse housings mounted on voltage transformers
Fuse housing mounted vertically (VVC and FT) and horizontally (FT)
