CN201569718U - On-line monitoring device for two-point earthing of AC voltage and current secondary loop - Google Patents
On-line monitoring device for two-point earthing of AC voltage and current secondary loop Download PDFInfo
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- CN201569718U CN201569718U CN2009202547915U CN200920254791U CN201569718U CN 201569718 U CN201569718 U CN 201569718U CN 2009202547915 U CN2009202547915 U CN 2009202547915U CN 200920254791 U CN200920254791 U CN 200920254791U CN 201569718 U CN201569718 U CN 201569718U
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Abstract
The utility model relates to a monitoring device in an electric power system, in particular to an on-line monitoring device for two-point earthing of an AC voltage and current secondary loop, which solves the problem that in the prior electric power system, no on-line monitoring device capable of monitoring multi-point earthing in a secondary loop exists. The monitoring device provided by the utility model comprises a main-control module, a voltage acquisition loop, a current collection loop and a power supply; the I/O pin of the main-control module is connected with a digital-analog converter, an input circuit and an output circuit; both the voltage acquisition loop and the current collection loop are connected with the analog input terminal of the main-control module; the power supply is connected with the power source terminal of the main-control module; a keystroke is connected to the input terminal of the main-control module; and a display module is connected to the output terminal of the main-control module. The utility model solves the problem that in the prior electric power system, no on-line monitoring device capable of monitoring multi-point earthing in a secondary loop exists, and is suitable for secondary loop monitoring in the electric power system.
Description
Technical field
The utility model relates to the power system monitoring device, specifically is 2 ground connection on-Line Monitor Device of a kind of alternating voltage electric current secondary loop.
Background technology
The secondary circuit of electric system plays important effect to the safe operation that ensures electric system.Under the electric system normal operation; in order to guarantee the safety of the person and equipment; one of " electric operating site safety rules " rated current mutual inductor, voltage transformer secondary loop is electrically connected a reliable earth point must be arranged; in order to guarantee the correct work of relay protection and aut.eq., can only there be an earth point again in a secondary circuit that is electrically connected simultaneously.But; large power plant and transformer station's electric current and voltage secondary circuit connection device are various; expanded range is wide; usually because artificial wiring error or some inevitable laws of nature; aging etc. as insulation; appear in the secondary circuit that is electrically connected and multipoint earthing occurs; and the secondary circuit major part of electric system is outdoor; the probability of insulation damages is big; multipoint earthing causes the incorrect operation protected; cause taking place repeatedly of large area blackout in system; for example; in a single day 2 ground connection take place in secondary circuit; owing to can not in time be found; when an earthed system generation earth fault; short-circuit current just may flow through electric substation's earth mat; between secondary two earth points, form potential difference (PD); caused the incorrect operation of protective device; this class accident is of common occurrence on power grid security accident declaration over the years; cause serious consequence to system; cause electrical network the serious accident of large-area power-cuts to occur, and electric system does not at present still have a kind of on-Line Monitor Device whether multipoint earthing takes place in can the on-line monitoring secondary circuit.
Summary of the invention
The utility model does not still have the problem whether on-Line Monitor Device of multipoint earthing takes place in a kind of energy on-line monitoring secondary circuit in order to solve present electric system, provides a kind of alternating voltage electric current secondary loop 2 ground connection on-Line Monitor Device.
The utility model is to adopt following technical scheme to realize: 2 ground connection on-Line Monitor Device of alternating voltage electric current secondary loop comprise main control module, voltage acquisition circuit, current acquisition circuit and power supply; The I/O pin of main control module is connected with digital to analog converter, opens into circuit and digital output circuit; Voltage acquisition circuit all links to each other with the analog input end of main control module with current acquisition circuit; Power supply links to each other with the power end of main control module; The input end of main control module is connected with button, and the output terminal of main control module is connected with display module.Described voltage acquisition circuit, current acquisition circuit, open into circuit, digital output circuit and be existing known configurations.
During concrete work, the I/O pin of main control module regularly produces digital signal, and digital to analog converter is converted into sine wave signal with digital signal and this sine wave signal is injected the one point earth place in detected loop; Voltage acquisition circuit and current acquisition circuit are responsible for the electric current and voltage of the sine wave signal that injects detected loop is measured in real time, and magnitude of voltage and the current value that records be sent to main control module, the insulating resistance value that main control module calculates detected loop according to the magnitude of voltage that receives and current value; Practice shows if in the detected loop multipoint earthing takes place, will have powerful electric current to pass through in the then detected loop, and promptly the insulating resistance value in detected loop will obviously reduce; Therefore, obviously reduce in case main control module calculates the insulating resistance value in detected loop, main control module promptly sends control signal and alarm signal by digital output circuit, finishes thus whether the on-line monitoring of multipoint earthing takes place in the detected loop; If will monitor again, then main control module is carried out signal return by opening into circuit; In this process, the insulating resistance value in the magnitude of voltage of sine wave signal and current value and detected loop etc. all shows in real time by display module.
Further, also comprise network interface, printing interface, watchdog circuit and clock chip; Wherein, network interface, printing interface, watchdog circuit, clock chip all link to each other with main control module; Network interface is used for connecting bus, carries out Network Transmission; Printing interface is used to connect printer, realizes online printing; The effect of watchdog circuit is to guarantee the device reliability service, avoids device generation deadlock phenomenon as much as possible; Clock chip charges to self in the device operational process, even device outage like this, clock also can true(-)running.
The utility model is simple in structure, easy to use, and having solved present electric system does not still have the problem whether on-Line Monitor Device of multipoint earthing takes place in a kind of energy on-line monitoring secondary circuit, is applicable to that the secondary circuit of electric system detects.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure: the 1-main control module, 2-digital to analog converter, 3-are opened into circuit, 4-digital output circuit, 5-voltage acquisition circuit, 6-current acquisition circuit, 7-button, 8-display module, 9-network interface, 10-printing interface, 11-watchdog circuit, 12-clock chip.
Embodiment
2 ground connection on-Line Monitor Device of alternating voltage electric current secondary loop comprise main control module 1, voltage acquisition circuit 4, current acquisition circuit 5 and power supply; The I/O pin of main control module 1 is connected with digital to analog converter 2, opens into circuit 3 and digital output circuit 4; Voltage acquisition circuit 5 all links to each other with the analog input end of main control module 1 with current acquisition circuit 6; Power supply links to each other with the power end of main control module 1; The input end of main control module 1 is connected with button 7, and the output terminal of main control module 1 is connected with display module 8; Also comprise network interface 9, printing interface 10, watchdog circuit 11 and clock chip 12; Wherein, network interface 9, printing interface 10, watchdog circuit 11, clock chip 12 all link to each other with main control module 1.During concrete enforcement, main control module 1 adopts the MC68HC912DG128A single-chip microcomputer, and display module 6 adopts LCDs, and clock chip 12 adopts the PCF8583 chip.
Claims (2)
1. 2 ground connection on-Line Monitor Device of an alternating voltage electric current secondary loop is characterized in that: comprise main control module (1), voltage acquisition circuit (5), current acquisition circuit (6) and power supply; The I/O pin of main control module (1) is connected with digital to analog converter (2), opens into circuit (3) and digital output circuit (4); Voltage acquisition circuit (5) all links to each other with the analog input end of main control module (1) with current acquisition circuit (6); Power supply links to each other with the power end of main control module (1); The input end of main control module (1) is connected with button (7), and the output terminal of main control module (1) is connected with display module (8).
2. 2 ground connection on-Line Monitor Device of alternating voltage electric current secondary loop according to claim 1 is characterized in that: also comprise network interface (9), printing interface (10), watchdog circuit (11) and clock chip (12); Wherein, network interface (9), printing interface (10), watchdog circuit (11), clock chip (12) all link to each other with main control module (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202547915U CN201569718U (en) | 2009-11-27 | 2009-11-27 | On-line monitoring device for two-point earthing of AC voltage and current secondary loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202547915U CN201569718U (en) | 2009-11-27 | 2009-11-27 | On-line monitoring device for two-point earthing of AC voltage and current secondary loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201569718U true CN201569718U (en) | 2010-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202547915U Expired - Lifetime CN201569718U (en) | 2009-11-27 | 2009-11-27 | On-line monitoring device for two-point earthing of AC voltage and current secondary loop |
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| Country | Link |
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| CN (1) | CN201569718U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968524A (en) * | 2010-09-30 | 2011-02-09 | 王道龙 | Division test method and tester for multi-point grounding of common loop |
| CN102749549A (en) * | 2012-06-21 | 2012-10-24 | 云南电力试验研究院（集团）有限公司电力研究院 | Intelligent checking system for substation alternating current voltage secondary circuit |
| CN103605041A (en) * | 2013-11-14 | 2014-02-26 | 国家电网公司 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
| CN104092192A (en) * | 2014-07-04 | 2014-10-08 | 天津大学 | Method for recognizing two-point grounding covert faults of voltage transformer secondary circuit |
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| CN109596934A (en) * | 2018-11-30 | 2019-04-09 | 广州格兴全电力科技有限公司 | A kind of double split-core type meter mensurations of secondary circuit multipoint earthing |
| CN110954845A (en) * | 2019-12-19 | 2020-04-03 | 深圳供电局有限公司 | CT secondary circuit multipoint earth fault on-line monitoring system and method |
-
2009
- 2009-11-27 CN CN2009202547915U patent/CN201569718U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968524A (en) * | 2010-09-30 | 2011-02-09 | 王道龙 | Division test method and tester for multi-point grounding of common loop |
| CN102749549A (en) * | 2012-06-21 | 2012-10-24 | 云南电力试验研究院（集团）有限公司电力研究院 | Intelligent checking system for substation alternating current voltage secondary circuit |
| CN102749549B (en) * | 2012-06-21 | 2016-07-06 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of transformer station AC current-voltage secondary circuit Smart Verify system |
| CN103605041A (en) * | 2013-11-14 | 2014-02-26 | 国家电网公司 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
| CN103605041B (en) * | 2013-11-14 | 2017-01-18 | 国家电网公司 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
| CN104092192A (en) * | 2014-07-04 | 2014-10-08 | 天津大学 | Method for recognizing two-point grounding covert faults of voltage transformer secondary circuit |
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| CN109596934A (en) * | 2018-11-30 | 2019-04-09 | 广州格兴全电力科技有限公司 | A kind of double split-core type meter mensurations of secondary circuit multipoint earthing |
| CN109596934B (en) * | 2018-11-30 | 2021-06-01 | 广州格兴全电力科技有限公司 | Secondary circuit multipoint grounding double-clamp meter measuring method |
| CN110954845A (en) * | 2019-12-19 | 2020-04-03 | 深圳供电局有限公司 | CT secondary circuit multipoint earth fault on-line monitoring system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100901 |
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| CX01 | Expiry of patent term |