20-HZ GENERATOR

20Hz BAND PASS FILTER

In order to implement a 100 % stator earth fault protection based on sub harmonic injection, a 20Hz voltage is injected into the generator star point. The 20-Hz generator SGEN-1001 is used in combination with the band pass filter SBPF-1001 in the Stator Earth fault protection. Injection can be performed by connecting the SGEN-1001 and the SBPF-1001 to the load resistor of an earthing or neutral transformer. If an earth fault occurs in the generator star point, the 20 Hz voltage drives a current through the fault resistance. From the driving voltage and the fault current, the protective relay determines the fault resistance.

Features

  • 100 % stator earth fault protection based on sub harmonic injection
  • Able to detect stator ground faults when the generator is offline
  • Providing a wide range of fault resistance coverage
  • Low Cost unit with high performance
  • Plug and Play System

Application

  • Generators

20-HZ GENERATOR SPECIFICATION

Power Supply
Supply Voltage 85 to 260V AC, 1φ, (47Hz to 63Hz)

or 120V to 370V DC

System Status
LED Power & Signal
Alarm PFC contact
Output Signal
Output Voltage 50V +10%, Rectangular
Output Current 10A continuously
Output Frequency 20Hz +5%
Efficiency 85%
Environment
Operating Temp 0°to 55°C
Humidity 93% Non Condensing
Cooling Passively Cooled
Mechanical
Dimension 482mm x 173mm x 245mm +5mm
Enclosure Panel/Table Top Mountable
Protection Class IP20
Test
Burn in Test IEC 60068-2-78
Vibration Test IEC 60068-2-6
Shock Test IEC 60068-2-27
Seismic Test IEC 60068-3-3

20Hz BAND PASS FILTER SPECIFICATION

Input Signal
Frequency 20Hz +5%
Voltage 50V +10%, Rectangular
Output Signal
Output Voltage Min 25V RMS without Load
Output Current 5A continuously
Output Frequency 20Hz +5%
Withstand voltage 140V at 50Hz (NGT V)
Impedance at center frequency <5Ω @ 20Hz
Impedance at System frequency >50Ω @ 50Hz
Environment
Operating Temp 0°to 55°C
Humidity 93% Non Condensing
Cooling Passively Cooled
Mechanical
Dimension 482mm x 173mm x 245mm +5mm
Enclosure Panel/Table Top Mountable
Protection Class IP20
Test
Burn in Test IEC 60068-2-78
Vibration Test IEC 60068-2-6
Shock Test IEC 60068-2-27
Seismic Test IEC 60068-3-3