Overcurrent relay NR-300 is intentionally developed for the power transformers’ protection in distributive and industrial substations 10(20)/0,4kV. The relay can be applied to protect power transformers of all standard powers (160 – 2000 kVA). It can also be used in applications where there is no auxiliary power supply in a power station because it can be powered from the measuring circuit through the current transformers. Small dimensions enable the relay to be built in directly in the medium voltage switchgear equipment.
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- overcurrent relay with L, S tripping characteristics (Long time delay, Short time delay)
- numerical signal processing
- auxiliary power supply not needed
- true RMS current measurement
- high accuracy of tripping characteristics
- relay test via auxiliary winding of the current transformer
- wide measuring range from 0,8 to 70 In
- microcontroller measuring signal processing (RISC)
- wide trip time range from 30ms to several hours
- pulse stream to drive actuator ensures safe trip in case of breaker mechanism failure
- self test
- small dimensions according to DIN 43700 for panel instruments and direct build in the medium voltage switchgear equipment
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