Overcurrent Relay NR-100
An overcurrent relay developed for protection of power transformers in 10(20)/0.4 kV distribution and industrial substations and for protection of small power transformers in medium-voltage installations. It can be powered from the measuring circuit through standard current transformers.
An overcurrent relay developed for protection of power transformers in 10(20)/0.4 kV distribution and industrial substations and for protection of small power transformers in medium-voltage installations. It can be powered from the measuring circuit through standard current transformers.
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Power transformer protection
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Inverse I2t characteristic
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L, S and I protection segments
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True RMS current measurement
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Operation without auxiliary power supply
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2x16 LCD display
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Self-test and local availability indication
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Optional RS485 MODBUS RTU
- Rated current for ST1 transformer
- 25 mA
- Rated current for STA1 or ANB transformer
- 36 mA
- Measuring range
- 2 In to 30 In
- Burden
- <0.3 VA
- Withstand
- continuous 10 x In, 1 s 100 x In
- Protection characteristics
- inverse I2t, short-time definite-time, instantaneous short-circuit protection
- Display
- LCD 2x16
- Communication
- optional RS485 MODBUS RTU
- Auxiliary supply
- 110 or 220 V AC, 24/110/220 V DC
- Measuring circuit supply option
- through ST1, STA1 or ANB current transformers
- Temperature range
- -20 C to +60 C
- Mounting
- panel, DIN 43700
- Dimensions
- 96 x 96 x 90 mm
- MODBUS RTU (option)