JPS641422A - Ground fault protection relay - Google Patents
Ground fault protection relayInfo
- Publication number
- JPS641422A JPS641422A JP15574587A JP15574587A JPS641422A JP S641422 A JPS641422 A JP S641422A JP 15574587 A JP15574587 A JP 15574587A JP 15574587 A JP15574587 A JP 15574587A JP S641422 A JPS641422 A JP S641422A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- voltage
- difference
- zero
- ground
- 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.)
- Granted
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To detect a ground fault accident feeder with high sensitivity and adequacy, by discriminating ground fault phase from the change width of zero- phase voltage and the sum of two-phase phase voltage, and by phase-comparing the voltage and zero-phase current with each other.
CONSTITUTION: At the same time as zero-phase voltage, VO is input-stored in a storage circuit 1, a difference ▵VO between a present value V0i and a value VO(i-1)before a fixed time is found by an arithmetic circuit 2, and the input to a first phase comparing circuit 3 is provided. The input of respective phase voltage VA, VB, VC to the first phase comparing circuit 3 is also provided, and respective voltage VB+VC, VA+VC, VB+VA and the difference ▵VO are phase-compared with each other, and when the voltage VB+VC and the difference ▵VO are within a constant phase difference, then it is discriminated that the voltage is for A-phase ground. In the same manner also in case of the difference ▵VO and the voltage VA+VC, VA+VB, it is discriminated that the voltage is for B-phase ground or for C-phase ground. As this comparison result, by a second phase comparing circuit 4, zero-phase current IO and the voltage VB+VC, VA+VC, VA+VB are phase-compared with each other, and as its result, an accident feeder can be selectively interrupted.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15574587A JP2600682B2 (en) | 1987-06-23 | 1987-06-23 | Ground fault protection relay |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15574587A JP2600682B2 (en) | 1987-06-23 | 1987-06-23 | Ground fault protection relay |
Publications (3)
Publication Number | Publication Date |
---|---|
JPH011422A JPH011422A (en) | 1989-01-05 |
JPS641422A true JPS641422A (en) | 1989-01-05 |
JP2600682B2 JP2600682B2 (en) | 1997-04-16 |
Family
ID=15612501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15574587A Expired - Fee Related JP2600682B2 (en) | 1987-06-23 | 1987-06-23 | Ground fault protection relay |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2600682B2 (en) |
-
1987
- 1987-06-23 JP JP15574587A patent/JP2600682B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2600682B2 (en) | 1997-04-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |