CN103094979A - Standby power for electric system direct current grounding line checking - Google Patents
Standby power for electric system direct current grounding line checking Download PDFInfo
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- CN103094979A CN103094979A CN2013100631057A CN201310063105A CN103094979A CN 103094979 A CN103094979 A CN 103094979A CN 2013100631057 A CN2013100631057 A CN 2013100631057A CN 201310063105 A CN201310063105 A CN 201310063105A CN 103094979 A CN103094979 A CN 103094979A
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- direct current
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- detection circuit
- power supply
- transformer station
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Abstract
The invention provides a standby power for electric system direct current grounding line checking, and belongs to the technical field of substation direct current grounding line checking. The standby power solves the problem that when line selection and segmentation searching are carried out on a protection and control return circuit direct current power, a direct current power of a protection or control device breaks. A substation direct current system is connected with a to-be-detected direct current bus of the substation direct current system through an air switch, a direct current power output end of a direct current high-frequency switch power is connected with a direct current power input end of a polarity detection circuit, an output end of the polarity detection circuit is connected with the to-be-detected bus of the substation direct current system to form a return circuit, and the direct current power output end of the direct current high-frequency switch power is connected with a direct current power input end of a leakage current detection circuit. The standby power is used for the substation direct current grounding line checking.
Description
Technical field
The present invention relates to electric power system DC earthing line inspection stand-by power supply, belong to transforming plant DC ground connection line inspection technical field.
Background technology
Transformer station direct current system is the automatic control for whole transformer station, the important component part that protective device provides power supply; in transformer station, direct current system adopts radial power supply or looply connected power supply network; when DC earthing occurs when; very unfavorable to whole protection, control system safe operation; and field by using is drawn the way judgement grounded circuit of road route selection; and then search piecemeal, the risk of this way is very big.When drawing road route selection and segment lookup, causing protection or control device DC power supply to interrupt protection and control loop DC power supply, easily cause and protect tripping to bypass the immediate leadership, cause a series of accident.
Summary of the invention
The present invention is in order to solve when the protection of transformer station and control loop DC power supply are drawn road route selection and segment lookup, and the problem that causes protection or control device DC power supply to interrupt provides a kind of electric power system DC earthing line inspection stand-by power supply.
Electric power system DC earthing line inspection stand-by power supply of the present invention, it comprises the air switch of transformer station direct current system, it also comprises direct current high frequency switch power, polarity detection circuit and leakage current detection circuit,
Transformer station direct current system connects the dc bus to be measured of transformer station direct current system through air switch,
The dc power output end of direct current high frequency switch power connects the dc supply input of polarity detection circuit, and the dc bus to be measured of the output of polarity detection circuit and transformer station direct current system is connected to form the loop,
The dc power output end of direct current high frequency switch power connects the dc supply input of leakage current detection circuit.
Described leakage current detection circuit adopts the direct current tong-type leakage current meter to realize.
advantage of the present invention: the invention provides a kind of temporary source that uses when searching the transformer station direct current system grounded circuit, when need to draw the road route selection to the DC loop of transformer station direct current system ground connection, the positive negative terminal of described stand-by power supply is received below the DC power supply air switch or insurance that need to draw the road, after the polarity correct wiring, this stand-by power supply access dc bus, this moment, the air switch with transformer station direct current system pulled open, be about to stand-by power supply access DC loop, and disconnect with transformer station direct current system, so, can detect transformer station direct current system and whether have earth fault, can adopt leak current detection device to carry out searching of fault.
Stand-by power supply of the present invention; when having avoided the protection of transformer station and control loop DC power supply are drawn road route selection and segment lookup; the protection that causes or the Power supply of control device interrupt; ensure the normal operation of protection or control device, can reduce the rate of breakdown of transformer station direct current system.
Description of drawings
Fig. 1 is the principle schematic of electric power system DC earthing line inspection stand-by power supply of the present invention;
Fig. 2 is the panel setting of electric power system DC earthing line inspection stand-by power supply of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the described electric power system DC earthing of present embodiment line inspection stand-by power supply, it comprises the air switch 4 of transformer station direct current system, and it also comprises direct current high frequency switch power 1, polarity detection circuit 2 and leakage current detection circuit 3
Transformer station direct current system connects the dc bus to be measured of transformer station direct current system through air switch 4,
The dc power output end of direct current high frequency switch power 1 connects the dc supply input of polarity detection circuit 2, and the dc bus to be measured of the output of polarity detection circuit 2 and transformer station direct current system is connected to form the loop,
The dc power output end of direct current high frequency switch power 1 connects the dc supply input of leakage current detection circuit 3.
In present embodiment, direct current high frequency switch power 1 is as the core component of described stand-by power supply.Polarity detection circuit 2 can prevent that stand-by power supply and the access of direct current system reversed polarity from causing the system failure.During use, at first with direct current high frequency switch power 1 incoming transport power supply, then check whether its direct current output is normal, and suitably adjust VD, binding post is accessed line loop load side to be selected according to polar requirement, polarity is pulled open air switch 4 after connecting correctly, and whether can detect direct current system has earth fault.
The present invention in use can make dc bus to be detected loop and transformer station direct current system thoroughly break away from, thereby detect transformer station direct current system, whether earth fault is arranged.The direct current output of direct current high frequency switch power 1 draws the loop sky of road route selection open load side and connect through polarity detection circuit 2 and preparation, pull open air switch, namely form one and be independent of the station with the DC loop by interim stand-by power supply power supply of direct current system, guarantee the DC loop uninterrupted power supply when judging whether there is earth fault.
Embodiment two: below in conjunction with Fig. 1 and Fig. 2, present embodiment is described, present embodiment is described further execution mode one, and the described leakage current detection circuit 3 of present embodiment adopts the direct current tong-type leakage current meter to realize.
Many outlets for the upper public DC power supply of dc bus row, can adopt the direct current tong-type leakage current meter to detect the auxiliary preliminary judgement that leakage current carries out DC earthing, dwindle line inspection scope, then access described stand-by power supply to direct current system the choosing of taking out stitches survey.
Shown in Figure 2, can arrange this stand-by power supply as required power supply indicator, polarity alarm indicator, direct current input indicator light, ammeter, D.C. voltmeter and polarity detect and drop into switch, and connect it on panel that is arranged on the stand-by power supply shell by circuit, check whether D.C. voltmeter is normal after dropping into AC power during use, and regulation output voltage is as far as possible near system's direct voltage, the direct current output connection is required the access DC loop according to the phase look, drop into the polarity sense switch, check that direct current drops into indicator light and whether lights.Pull open DC loop air switch to be selected and can detect whether earth fault is arranged.
Claims (2)
1. electric power system DC earthing line inspection stand-by power supply, it comprises the air switch (4) of transformer station direct current system, it is characterized in that, it also comprises direct current high frequency switch power (1), polarity detection circuit (2) and leakage current detection circuit (3)
Transformer station direct current system connects the dc bus to be measured of transformer station direct current system through air switch (4),
The dc power output end of direct current high frequency switch power (1) connects the dc supply input of polarity detection circuit (2), and the output of polarity detection circuit (2) and the dc bus to be measured of transformer station direct current system are connected to form the loop,
The dc power output end of direct current high frequency switch power (1) connects the dc supply input of leakage current detection circuit (3).
2. electric power system DC earthing line inspection stand-by power supply according to claim 1, is characterized in that, described leakage current detection circuit (3) adopts the direct current tong-type leakage current meter to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100631057A CN103094979A (en) | 2013-02-28 | 2013-02-28 | Standby power for electric system direct current grounding line checking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100631057A CN103094979A (en) | 2013-02-28 | 2013-02-28 | Standby power for electric system direct current grounding line checking |
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| Publication Number | Publication Date |
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| CN103094979A true CN103094979A (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013100631057A Pending CN103094979A (en) | 2013-02-28 | 2013-02-28 | Standby power for electric system direct current grounding line checking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019049A (en) * | 2016-05-19 | 2016-10-12 | 国网新疆电力公司伊犁供电公司 | Auxiliary device for DC grounding search of transformer station |
| CN110514945A (en) * | 2019-07-12 | 2019-11-29 | 国网浙江省电力有限公司嘉兴供电公司 | A kind of multifunctional DC grounding test apparatus and Method for Measuring Insulating Resistance |
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| JP2009254102A (en) * | 2008-04-04 | 2009-10-29 | Mitsubishi Electric Corp | Uninterruptible power supply device |
| CN201774301U (en) * | 2010-06-24 | 2011-03-23 | 甘肃省电力公司兰州供电公司 | High frequency switch DC supply system for substation |
| CN102664454A (en) * | 2012-05-10 | 2012-09-12 | 四川电力科学研究院 | Non-floating charging type substation direct current power supply system based on iron lithium battery |
| CN203056675U (en) * | 2013-02-28 | 2013-07-10 | 绥化电业局 | DC grounding and line inspection stand-by power supply of power system |
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2013
- 2013-02-28 CN CN2013100631057A patent/CN103094979A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009254102A (en) * | 2008-04-04 | 2009-10-29 | Mitsubishi Electric Corp | Uninterruptible power supply device |
| CN201774301U (en) * | 2010-06-24 | 2011-03-23 | 甘肃省电力公司兰州供电公司 | High frequency switch DC supply system for substation |
| CN102664454A (en) * | 2012-05-10 | 2012-09-12 | 四川电力科学研究院 | Non-floating charging type substation direct current power supply system based on iron lithium battery |
| CN203056675U (en) * | 2013-02-28 | 2013-07-10 | 绥化电业局 | DC grounding and line inspection stand-by power supply of power system |
Non-Patent Citations (1)
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| 王礼田等: "电力系统直流接地故障探测方法的探讨", 《山西电力》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019049A (en) * | 2016-05-19 | 2016-10-12 | 国网新疆电力公司伊犁供电公司 | Auxiliary device for DC grounding search of transformer station |
| CN110514945A (en) * | 2019-07-12 | 2019-11-29 | 国网浙江省电力有限公司嘉兴供电公司 | A kind of multifunctional DC grounding test apparatus and Method for Measuring Insulating Resistance |
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Application publication date: 20130508 |