Price of Guodian Nanrui Transformer Protection Device

Guodian Nanrui NSR-378 Transformer Protection DeviceGuodian Nanrui NSR-378 Transformer Protection Device

Scope of application

The NSR-378 transformer protection device is suitable for various types and wiring methods of transformers with voltage levels of 220kV and above

The device. The device includes differential protection and complete backup protection on all sides.

Product features

Fast action speed, typical action time, differential quick break action time not exceeding 15ms, longitudinal differential protection action time

Not exceeding 25ms

Fully utilizing the difference between the waveform characteristics of fault current and excitation inrush current, comprehensively utilizing the harmonic content and waveform of the waveform

Identify excitation inrush current and fault current based on interruption and waveform symmetry

Using sample currents with zero sequence current components to identify excitation inrush currents, the charging and decoupling of each phase inrush current more accurately reflects the present situation

Phase excitation current, achieving phase separation inrush current braking

Based on whether the waveform is symmetrical about the positive and negative half cycles, accurately identify the excitation inrush current using the amplitude ratio criterion

By utilizing the common feature of intermittent waveform of excitation inrush current and CT saturation caused by faults outside the area during transformer airdrop, a waveform is adopted

Intermittent technology for identifying excitation inrush current and CT saturation of out of zone faults

Using the CT saturation criterion of *, comprehensively utilizing the characteristics of time difference method, linear region, and discontinuous difference waveform, accurately identifying

Avoid various saturation states of CT inside and outside the area, and ensure reliable operation when CT is saturated due to faults inside the area and when CT is saturated due to faults outside the area

Reliable and not refusing to move from outside the area to inside the areaPrice of Guodian Nanrui Transformer Protection Device Price of Guodian Nanrui Transformer Protection Device

装置功能

protection function

Longitudinal differential protection, phase differential, side differential, zero sequence differential, and cell differential

Impedance protection

Overexcitation protection

Multiple voltage locking (direction) overcurrent protection

Zero sequence (directional) overcurrent protection

Gap protection

Circuit breaker failure and tripping

Overload alarm

Overload start air cooling

Overload lockout voltage regulation