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protection relays MV and HV

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All new products

NG20

MULTIFUNCTION PROTECTION FOR SYNCHRONOUS GENERATORS OR NOT SELF-STARTED
SYNCHRONOUS MOTORS

More details...

‹ ›

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Price on request

Reference : NG20

More info
Data sheet
Download

Several functions, required for synchronous generators and not self-started synchronous motors are included.

Applications
• Generator
• Motor
Protection functions
• Pt100 thermometric probes (26)
• Undervoltage (27)
• Reverse active overpower (32R)
• Directional active underpower (37P)
• Loss of field (40)
• Negative sequence overcurrent (46)
• Thermal image (49)
• Phase overcurrent (50/51)
• Residual overcurrent (50N/51N)
• Voltage-controlled overcurrent (51V)
• Minimum power factor (55)
• Overvoltage (59)
• Residual overvoltage (59N)
• Underfrequency & overfrequency (81U 81O)
• High impedance restricted earth fault (87NHIZ)
• Breaker failure (BF)
Monitoring and control functions
• CB diagnostic
• CTs monitoring (74CT)
• Digital Fault recording (DFR)
• Fault and event logging (SER & SFR)
• Logic selectivity
• Multiple setting profiles
• Programmable Logic Controller
• Self-test
• Trip circuit supervision (74TCS)
• VTs monitoring (74VT)
Hardware
• 19-inch "4U" rack mounting
• 8 binary inputs + 8 output relays + 16 LEDs
• Auxiliary power supply 110-230 Vac/dc
• Auxiliary power supply 24-48 Vac/dc
• Network module with Ethernet FX port (optical fiber)
• Network module with Ethernet TX port (copper RJ45) + RS485 port
• Nominal current 1/5 A selectable by DIP-switch
• RS485 port (unavailable with Ethernet FX port)
• Standard CT amperometric inputs 1/5 A
Communication
• Modbus RTU RS232 protocol
• Modbus RTU RS485 / IEC 870-5-103 / DNP3 protocol
• Modbus TCP/IP protocol (network board must be provided)

application MOTOR|GENERATOR
ANSI protection Directional active underpower (37P)|High impedance restricted earth fault (87NHIZ)|Voltage-controlled overcurrent (51V)|Thermal image (49)|Underfrequency & overfrequency (81U 81O)|Undervoltage (27)|Residual overcurrent (50N/51N)|Reverse active overpower (32R)|Pt100 thermometric probes (26)|Loss of field (40)|Negative sequence overcurrent (46)|Minimum power factor (55)|Residual overvoltage (59N)|Phase overcurrent (50/51)|Overvoltage (59)|Breaker failure (BF)