CN101202432B - Control method of relay control circuit - Google Patents
Control method of relay control circuit Download PDFInfo
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- CN101202432B CN101202432B CN2006101473968A CN200610147396A CN101202432B CN 101202432 B CN101202432 B CN 101202432B CN 2006101473968 A CN2006101473968 A CN 2006101473968A CN 200610147396 A CN200610147396 A CN 200610147396A CN 101202432 B CN101202432 B CN 101202432B
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- relay
- circuit breaker
- current
- circuit
- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000005070 sampling Methods 0.000 abstract 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- Protection Of Transformers (AREA)
Abstract
The invention provides a control method of a relay control circuit, which comprises at least one circuit breaker, a relay which controls the on/off of the circuit breaker, a secondary controlling circuit which consists of a potential transformer and a current transformer; the secondary controlling circuit provides sampling voltage to the relay and the current transformer provides sampling current to the relay; wherein, when the relay detects that the sampling voltage is lower than the prearranged voltage and the sampling current is lower than the prearranged current, the relay controls the circuit breaker to trip. Compared with the prior art, the relay control circuit of the invention judges whether to disconnect the circuit breaker by detecting the voltage value and the current value at the same time, which can more ensure that the relay disconnect the circuit breaker only on unusual power supply condition than that only the voltage value is detected, thus effectively avoiding the disconnection of the circuit breaker caused by the mistaken judge of the relay caused by other unexpected situations.
Description
Technical field
The present invention relates to the control circuit of 10KV transformer station inside, specifically, relate to the control method of control relay circuit.
Background technology
Be typically provided with relay on the switch cubicle in the 10KV transformer station.Relay has measurement, monitors, and the function of control and protection, defencive function can act on circuit breaker trip, protects whole transformer station.When relay detects sampled voltage from secondary control loop and is lower than predetermined magnitude of voltage, will make circuit breaker trip automatically after the time that in waiting for relay, is provided with.
Yet, in the process of practical operation, be provided with a PT switch in the secondary control loop, if this switch under the normal power supply situation by misoperation, secondary control loop is disconnected, and the relay sample voltage value is zero, reaches the relay setting-up time and can make circuit breaker trip automatically, cause that transformer station stops power supply under the situation of normal power supply, cause bigger economic loss.
Summary of the invention
The object of the present invention is to provide a kind of control method of new control relay circuit, prevent to stop power supply under the fortuitous event.
For achieving the above object, the invention provides a kind of control method of control relay circuit, this control circuit comprises a circuit breaker at least, a relay of controlling circuit breaker conducting and disconnection, a secondary control loop that constitutes by PT and current transformer, secondary control loop provides sampled voltage to relay, and current transformer provides sample rate current to relay; Wherein, be lower than predetermined voltage, and sample rate current is then controlled circuit breaker trip when being lower than scheduled current when relay detects sampled voltage.
Compared with prior art, control relay circuit of the present invention judges whether cut-off breaker by while sampled voltage and current value, can guarantee more that than a sample voltage value relay only could control the circuit breaker disconnection under abnormal situation in power supply, effectively avoid other fortuitous events to cause the relay false judgment and cut-off breaker.
Description of drawings
To the description of one embodiment of the invention, can further understand purpose, specific structural features and the advantage of its invention by following in conjunction with its accompanying drawing.Wherein, accompanying drawing is:
Fig. 1 is the schematic diagram of control relay circuit of the present invention.
Embodiment
As shown in Figure 1, control relay circuit of the present invention mainly comprises a circuit breaker 1, controls the relay 2 of this circuit breaker 1, PT 3, the PT switch 4 of connecting with PT 3, and current transformer 5.Press in the node A input.
From PT 3 and PT switch 4 series connection gained voltages is relay 2 sampled voltages.Pass through the electric current of current transformer 5 conversions as relay 2 sample rate currents from the major loop output current.
Claims (2)
1. the control method of a control relay circuit, this control circuit comprises a circuit breaker at least, a relay of controlling circuit breaker conducting and disconnection, a secondary control loop that constitutes by PT and current transformer, PT provides sampled voltage to relay, and current transformer provides sample rate current to relay; It is characterized in that: be lower than predetermined voltage when relay detects sampled voltage, and sample rate current then controls circuit breaker trip when being zero, wherein, described predetermined voltage is 20 percent of a rated voltage.
2. the control method of a kind of control relay circuit as claimed in claim 1 is characterized in that: sampled voltage is lower than predetermined voltage and sample rate current is zero when relay detects, and reaches the relay setting-up time, then relay control circuit breaker trip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101473968A CN101202432B (en) | 2006-12-15 | 2006-12-15 | Control method of relay control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101473968A CN101202432B (en) | 2006-12-15 | 2006-12-15 | Control method of relay control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101202432A CN101202432A (en) | 2008-06-18 |
| CN101202432B true CN101202432B (en) | 2010-11-24 |
Family
ID=39517450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101473968A Active CN101202432B (en) | 2006-12-15 | 2006-12-15 | Control method of relay control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101202432B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425092A (en) * | 2015-11-17 | 2016-03-23 | 高新兴科技集团股份有限公司 | Method for judging network cabinet tripping |
| CN107046272B (en) * | 2017-06-15 | 2019-08-27 | 国网山西省电力公司电力科学研究院 | Circuit breaker emergency trip control circuit and control method after all DC power disappears |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896260A (en) * | 1996-02-05 | 1999-04-20 | Css Power, Inc. | Electronic safety break and method |
| CN2368206Y (en) * | 1999-04-21 | 2000-03-08 | 国家电力公司南京电力自动化设备总厂 | Microcomputor delay protection device for power equipment |
| CN1078756C (en) * | 1996-09-16 | 2002-01-30 | 尹顿公司 | Sequence based network protector relay with forward overcurrent protection and anti-pumping feature |
| CN1402404A (en) * | 2002-07-23 | 2003-03-12 | 甘肃省电力公司 | DC system short circuit protection device |
-
2006
- 2006-12-15 CN CN2006101473968A patent/CN101202432B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896260A (en) * | 1996-02-05 | 1999-04-20 | Css Power, Inc. | Electronic safety break and method |
| CN1078756C (en) * | 1996-09-16 | 2002-01-30 | 尹顿公司 | Sequence based network protector relay with forward overcurrent protection and anti-pumping feature |
| CN2368206Y (en) * | 1999-04-21 | 2000-03-08 | 国家电力公司南京电力自动化设备总厂 | Microcomputor delay protection device for power equipment |
| CN1402404A (en) * | 2002-07-23 | 2003-03-12 | 甘肃省电力公司 | DC system short circuit protection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101202432A (en) | 2008-06-18 |
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