20 Hz Generator
20 Hz Generator
In order to implement a 100 % stator earth fault protection based on subharmonic 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. The 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 subharmonic injection
- Detectsstator earth faults when the generator is offline
- Provides a wide range of fault resistance coverage
- Low-cost unit with high performance
- Plug and Play System
Applications
- Generators
Specifications
20Hz 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 Peak to peak +10%, Rectangular |
| Output Current | 5A 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 BANDPASS 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 | 245V AC at 50Hz (NGT V) |
| The impedance at the centre frequency | <5Ω @ 20Hz |
| The 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 |
