Overcurrent Relay NR-300
An overcurrent relay specifically developed for protection of power transformers in 10(20)/0.4 kV distribution and industrial substations. It is suitable for standard transformer ratings from 160 to 2000 kVA.
An overcurrent relay specifically developed for protection of power transformers in 10(20)/0.4 kV distribution and industrial substations. It is suitable for standard transformer ratings from 160 to 2000 kVA.
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Protection of 160 to 2000 kVA transformers
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L and S trip characteristics
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Operation without auxiliary power supply
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True RMS current measurement
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High trip characteristic accuracy
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Second-harmonic trip blocking
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Optional earth fault protection
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USB 2.0 CDC and optional RS485 MODBUS RTU
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Direct installation in medium-voltage switchgear
- Rated current
- 25 mA or 75 mA
- Input normalized current
- 1 to 3.5 In
- Measuring range
- 0.8 to 20 Is
- Burden
- <0.3 VA
- Withstand
- continuous 10 x In, 1 s 100 x In
- Overcurrent protection
- NI, VI, EI, DT, HV fuse characteristic
- I> setting
- 0.8 to 2.5 Is
- I>> setting
- 1 to 20 Is
- Earth fault protection option
- IE 0.2 to 2.5 Is
- Actuator pulse output
- 24 V, E=0.1 Ws
- Communication
- USB 2.0 CDC, optional RS485 MODBUS RTU
- Measuring circuit supply
- through SVA 100 current transformers
- Auxiliary supply option
- 110/220 V AC or 24/110/220 V DC
- Temperature range
- -30 C to +60 C
- Mounting
- panel, DIN 43700
- Housing protection class
- IP40
- Dimensions
- 144 x 48 x 105 mm
- MODBUS RTU (option)
- USB 2.0 CDC