Overcurrent relay NR-100 is a multifunctional numerical relay used for the protection of power transformers in distribution and industrial substations 10(20)/0.4kV and power transformers used for internall supplying substations in MV plants. NR-100 is designed to protect power transformers of all the standard power ratings built in the substations. Optionaly, the relay can be powered from the measurement circuit via standard current transformers (type ST1, STA1 or ANB, manufacturer KONČAR or WIC1-W manufacturer SEG) and used in cases when there is no auxiliary power supply in substation.
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- overcurrent relay with inverse time characteristics I2t
- digital signal processing
- measuring of the true RMS current values
- great accuracy of the trip characteristics
- relay test by means of the auxiliary winding on the standard current transformer
- wide measuring range from 2In to 60 In
- microprocessor (RISC) measuring signal processing
- 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, local indication of the device’s availability
- small dimensions, according to DIN 43700 standard for the built-in instruments
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