Voltage transformers

Voltage transformer — one of kinds of transformers, designed not for electric power transformation and for feeding a various devices, but for electrical isolation the high-voltage circuit (6kV and above) off low-voltage one (generally 100V) intended for measure. It is used in measuring circuits, for converting the power lines and generators high voltage to a low voltage, convenient for measuring.
Furthermore, voltage transformers application allows to insulate a low-voltage protection, measuring or control circuits off high voltage, which in turn, allows usage a cheaper equipment in low-voltage circuits and reduces the cost of the insulation.
Since voltage transformers are not designed for passing the power through it, the basic operation mode of the voltage transformer is no-load mode.



110, 150, 220 kV Single-phased oil-immersed voltage transformers НКФ type

  The НКФ type voltage transformers are single-phase, electromagnetic, oil-immersed, triple-wound, outdoor installation, designed for scale transformation of electric AC voltage with a view to its further measure and connection to the inputs of measuring instruments, protection devices and alarms. Transformers are designed for use in AC 50Hz electrical circuits, with rated voltage up to 220 kV. Transformers are designed to work in mains with effectively grounded neutral and can up to 30 sec. withstand primary overvoltage of 150% of its nominal value.
 For accurate determination of your needs, please fill out the questionnaire NKF-110.doc [64,5 Kb] (downloads: 8).



Voltage Transformers of the НКФА series

Measuring voltage transformers of the НКФА series - single-phase, electromagnetic, oil, four-winding, anti-resonance, outdoor installation, are designed for large-scale conversion of AC voltage with a frequency of 50 Hz or 60 Hz for the purpose of its further measurement and supply to the inputs of measuring equipment, protection and alarm devices ... Voltage transformers of the НКФА series are manufactured for voltage classes from 110 kV to 500 kV. Our company manufactures the following НКФА:
НКФА-123 (НКФА-110), НКФА-170 (НКФА-150), НКФА-245 (НКФА-220), НКФА-362 (НКФА-330), НКФА-525 (НКФА-500).



Voltage Transformers of the ЕТН series

ETH(ETN) measuring voltage transformers - capacitive, single-phase, oil, four-winding, anti-resonance, outdoor installation, are intended for use in AC electric circuits with a frequency of 50 Hz with a grounded neutral, in order to transmit a signal of measuring information to measuring, protection, automation, signaling and control devices, as well as providing high-frequency communication. Voltage transformers of the ЕТН series have antiferroresonant properties, have a single design of a capacitive module and an electromagnetic device. ETH series transformers are manufactured for voltage classes from 110 kV to 750 kV. ETH transformers have a hermetically sealed design. Our factory produces the following transformers



35 kV Single-phased oil-immersed voltage transformers ЗНОМ type

Grounding voltage transformers ЗНОМ-35-У1 (УХЛ1), single-phase, with natural oil cooling, are the scale inverters and are designed for transmission the data signal to measurement, protection, signaling, automation or mains-control measuring instruments, AC 50 Hz, with isolated neutral or with neutral, grounded through the Peterson coil.
For accurate determination of your needs, please fill out the questionnaire ZNOM-35.doc [38,5 Kb] (downloads: 46).
35 kV Single-phased oil-immersed voltage transformers ЗНОМ type



35 kV Three-phase oil-immersed voltage transformers НАМИ type

 Three-phased oil-immersed anti-resonance voltage transformer НАМИ-35 type УХЛ1 is designed for installation in three-phase AC 50Hz electric mains, 35kV rated voltage, with ineffectively grounded neutral, to form signal for measurement and electrical protective devices.
 For accurate determination of your needs, please fill out the questionnaire NAMI-35.doc [64,5 Kb] (downloads: 10).



6-10 kV Oil-immrsed voltage transformers, НТМИ-1, НАМИ-1 types

The transformers are designed for voltage measurement and may be connected to voltage meters and other devices that respond to the voltage, for example, the power meter voltage coils, electric meters, phase meters. Also they are usable for connection to automation, signaling and relay circuits. Applicable in AC 50Hz mains with voltage 6kV and 10kV with insulated neutral.
For accurate determination of your needs, please fill out the questionnaires NTMI.doc [38,5 Kb] (downloads: 16) NAMI.doc [40,5 Kb] (downloads: 6).