JPS54119648A - Static type protective relay - Google Patents
Static type protective relayInfo
- Publication number
- JPS54119648A JPS54119648A JP2549678A JP2549678A JPS54119648A JP S54119648 A JPS54119648 A JP S54119648A JP 2549678 A JP2549678 A JP 2549678A JP 2549678 A JP2549678 A JP 2549678A JP S54119648 A JPS54119648 A JP S54119648A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- operational amplifier
- reference current
- matching value
- protective relay
- 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
- Protection Of Transformers (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To prevent wrong operation, by coupling a level detection circuit to the contact of switch element, which generates the minimum of reference currents, when changing the matching value of a matching circuit.
CONSTITUTION: The input of the protective relay is rectified by a rectifier circuit REC so that a negative signal current I1 is applied to an inverting terminal of an operational amplifier OA. A positive reference current I2 is applied from fixed contacts a, b, c of the switch SW to the inverting terminal of the operational amplifier OA. Both the currents I1, I2 are compared with each other to produce a trip signal. A diode D is connected between a moving contact d of the switch SW and the fixed contact a which supplies the reference current corresponding to the minimum matching value. Thus, the reference current I2 is applied to the operational amplifier OA even if the moving contact d remains disconnected from the fixed contacts a∼c at the time of shifting of the switch SW. This eliminates the wrong operation due to the alteration of the matching value.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2549678A JPS54119648A (en) | 1978-03-08 | 1978-03-08 | Static type protective relay |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2549678A JPS54119648A (en) | 1978-03-08 | 1978-03-08 | Static type protective relay |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54119648A true JPS54119648A (en) | 1979-09-17 |
Family
ID=12167662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2549678A Pending JPS54119648A (en) | 1978-03-08 | 1978-03-08 | Static type protective relay |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54119648A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58122063A (en) * | 1982-01-13 | 1983-07-20 | Nippon Ranzubaagu Kk | Electrostatic coating device |
-
1978
- 1978-03-08 JP JP2549678A patent/JPS54119648A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58122063A (en) * | 1982-01-13 | 1983-07-20 | Nippon Ranzubaagu Kk | Electrostatic coating device |
JPH0154102B2 (en) * | 1982-01-13 | 1989-11-16 | Gema Ransburg Ag |
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