JPS54162149A - Neutral grounding monitor of generator - Google Patents
Neutral grounding monitor of generatorInfo
- Publication number
- JPS54162149A JPS54162149A JP7084078A JP7084078A JPS54162149A JP S54162149 A JPS54162149 A JP S54162149A JP 7084078 A JP7084078 A JP 7084078A JP 7084078 A JP7084078 A JP 7084078A JP S54162149 A JPS54162149 A JP S54162149A
- Authority
- JP
- Japan
- Prior art keywords
- generator
- zero
- neutral point
- impedance
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
PURPOSE: To discriminate either a grounding short of the generator neutral point or a cut of the neutral grounding device by detecting zero-phase voltage and zero- phase current, taking only a specific higher harmonic component from its output, and by computing the circuit impedance.
CONSTITUTION: The zero-phase voltage and zero-phase current of the generator 1 are detected by the auxiliary PT 10 and CT 7 respectively, and are fed to the third harmonic zero-phase impedance relay 11. The impedance relay takes only the third harmonic component by the third harmonic pass filter 111, 112, computes impedance of the circuit by the division unit 113, and decides whether the value is present within a fixed range, which is determined by both impedances of the generator and the neutral point grounding device, by the comparators 114, 115. Thus the fact that either a grounding short of the generator neutral point or a cut of the neutral point grounding device is present can be decided to prevent the occurrence of a serious accident.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7084078A JPS54162149A (en) | 1978-06-14 | 1978-06-14 | Neutral grounding monitor of generator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7084078A JPS54162149A (en) | 1978-06-14 | 1978-06-14 | Neutral grounding monitor of generator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54162149A true JPS54162149A (en) | 1979-12-22 |
Family
ID=13443153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7084078A Pending JPS54162149A (en) | 1978-06-14 | 1978-06-14 | Neutral grounding monitor of generator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54162149A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4507699A (en) * | 1981-12-30 | 1985-03-26 | Messer Griesheim Gmbh | Protective device for the welding circuit of welding power sources |
JPS61174603A (en) * | 1985-01-29 | 1986-08-06 | 日新電機株式会社 | Temperature monitor for midpoint ground resistor |
JPS6445441U (en) * | 1987-09-10 | 1989-03-20 |
-
1978
- 1978-06-14 JP JP7084078A patent/JPS54162149A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4507699A (en) * | 1981-12-30 | 1985-03-26 | Messer Griesheim Gmbh | Protective device for the welding circuit of welding power sources |
JPS61174603A (en) * | 1985-01-29 | 1986-08-06 | 日新電機株式会社 | Temperature monitor for midpoint ground resistor |
JPS6445441U (en) * | 1987-09-10 | 1989-03-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS54162149A (en) | Neutral grounding monitor of generator | |
JPS5366548A (en) | Grounding fault detector for dc circuit | |
JPS5471347A (en) | State detector | |
JPS54122844A (en) | Earthing protection relay system | |
JPS55159162A (en) | Direct current grounding detector | |
JPS51129643A (en) | Load-current/phase-lack detecting circuit for three-phase circuit | |
JPS5538046A (en) | Transformer for condenser type meter | |
JPS5482615A (en) | Controller for ac motor | |
JPS5347925A (en) | Inverter overvoltage protection system | |
JPS5317948A (en) | Protective circuit for overcurrent | |
JPS52124148A (en) | Condition detector for electric parts | |
JPS53111451A (en) | Ratio differential relay for transformer protection | |
JPS53101621A (en) | Parallel running device for inverter | |
JPS5571176A (en) | Protective system of direct current power source system | |
JPS5288747A (en) | Protecting system for inverter | |
JPS5463243A (en) | Transformer protection relay | |
JPS5468939A (en) | Neutral point grounding circuit for power generation or transmission system | |
JPS53111448A (en) | Protective equipment for cyclo-converter | |
JPS52140843A (en) | System for supervising current differential bus bar protection relay suppressing circuit | |
JPS6485525A (en) | Protective-relay unit with breaker non-working counter measure function | |
JPS53135438A (en) | Detection method of distance of short-circuit fault | |
JPS5355757A (en) | Power line protection | |
JPS547127A (en) | Overcurrent detector for inverter | |
JPS54105746A (en) | Detecting fault in electric power system | |
JPS5615170A (en) | Output current abnormality detector for inverter circuit |