JPS6485524A - Ground fault protective-relay system - Google Patents
Ground fault protective-relay systemInfo
- Publication number
- JPS6485524A JPS6485524A JP23928687A JP23928687A JPS6485524A JP S6485524 A JPS6485524 A JP S6485524A JP 23928687 A JP23928687 A JP 23928687A JP 23928687 A JP23928687 A JP 23928687A JP S6485524 A JPS6485524 A JP S6485524A
- Authority
- JP
- Japan
- Prior art keywords
- relay
- ground fault
- frequency
- zero
- output
- 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 enhance the allowance degree of ground fault protection coordination, by combining frequency detecting relays with each other, and by detecting low-frequency attenuating oscillation at the time of ground fault accident recovery, in both the positive and negative waves of zero-phase voltage, to lock the ground-directional relay of a sound circuit. CONSTITUTION:A ground fault protective-relay system is provided with a ground overvoltage relay 1 to which the input of zero-phase voltage V0 is provided, a ground fault directional relay 2 for preventing malfunction from being generated, and a frequency detecting relay 3 for detecting the fundamental frequency of the zero-phase voltage, and the input of their output and inversion output to an AND circuit 4 is provided, and from the output terminal of the AND circuit 4, the final working output of the ground fault directional relay 2 is obtained. Besides, with the frequency detecting relay 3, the sampling of the fundamental wave of the zero-phase voltage V0 is executed by every 30 deg., and the positive wave and the negative wave of the data are discriminated. In this case, when the fundamental frequency comes to a constant value or less and low-frequency attenuating oscillation is detected, then the output of relay locking command is generated, and the ground fault directional relay of a sound circuit is locked, and the malfunction is prevented from being generated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62239286A JPH0636647B2 (en) | 1987-09-24 | 1987-09-24 | Ground fault protection relay system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62239286A JPH0636647B2 (en) | 1987-09-24 | 1987-09-24 | Ground fault protection relay system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6485524A true JPS6485524A (en) | 1989-03-30 |
| JPH0636647B2 JPH0636647B2 (en) | 1994-05-11 |
Family
ID=17042481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62239286A Expired - Lifetime JPH0636647B2 (en) | 1987-09-24 | 1987-09-24 | Ground fault protection relay system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636647B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52136340A (en) * | 1976-05-11 | 1977-11-15 | Mitsubishi Electric Corp | Protective relay device |
| JPS52150534A (en) * | 1976-06-09 | 1977-12-14 | Mitsubishi Electric Corp | Earth relay |
-
1987
- 1987-09-24 JP JP62239286A patent/JPH0636647B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52136340A (en) * | 1976-05-11 | 1977-11-15 | Mitsubishi Electric Corp | Protective relay device |
| JPS52150534A (en) * | 1976-06-09 | 1977-12-14 | Mitsubishi Electric Corp | Earth relay |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0636647B2 (en) | 1994-05-11 |
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