CN203178409U - Direct current grounding line selection device - Google Patents
Direct current grounding line selection device Download PDFInfo
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- CN203178409U CN203178409U CN 201320225965 CN201320225965U CN203178409U CN 203178409 U CN203178409 U CN 203178409U CN 201320225965 CN201320225965 CN 201320225965 CN 201320225965 U CN201320225965 U CN 201320225965U CN 203178409 U CN203178409 U CN 203178409U
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- direct current
- line selection
- grounding
- variable resistance
- grounding line
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Abstract
The utility model provides a direct current grounding line selection device, and relates to an electrical detection device. The direct current grounding line selection device comprises a variable resistance box, a protection device, an automation device and an insulation supervision device. A direct current positive electrode is respectively connected with a power terminal of the variable resistance box, the protection device, the automation device and the insulation supervision device. A direct current negative electrode is respectively connected with the protection device, the automation device and the insulation supervision device. The variable resistance box is grounded via a grounding terminal, the protection device is grounded at a direct current negative electrode connection A via a grounding resistor R, the direct current negative electrode is connected with the protection device via a direct current clamp, and the resistance of an electrical bridge of the insulation supervision device is 20 kilo-ohm. The grounding line selection device is an automatic device integrated with sampling, storage, calculation, determination and output, multi-point grounding faults can be determined, and faulty lines can be selected; the grounding line selection device is free of the influence from transition resistors in a line, and faulty lines can be accurately determined.
Description
Technical field
The utility model relates to a kind of electric pick-up unit, particularly relates to a kind of DC earthing line selector.
Background technology
Along with the continuous development of integrated automation of transformation stations degree, straight-flow system has become the important ring in the power network safety operation for equipment such as relay protection, automatic safety device, automatically-monitored, communication provide safe and reliable power supply.The straight-flow system many serious consequences such as to cause communication disruption, supervisory system paralysis, protective device tripping that break down.Therefore, the construction of straight-flow system more and more obtains the attention of electric power enterprise.
Straight-flow system is isolated neutral system in the transformer station, when one point earth takes place, can't cause any harm, and system still can move.But must in time handle, otherwise when another ground connection is taken place, the malfunction of the protective device that might cause or tripping.
At present, the main method of searching DC earthing has and draws the road to search method and Portable DC system earth fault locator is searched method. when drawing the road to search the branch road of method on dc bus two tieback places are arranged simultaneously, can't lock fault branch line or trouble spot.Then at the scene in the practical application, success ratio is very low for Portable DC Earth Fault Detection instrument.
Summary of the invention
The purpose of this utility model is to provide a kind of DC earthing line selector; this earthing wire-selecting instrument can be judged the multipoint earthing fault; select faulty line; and be not subjected to the influence of transition resistance in the circuit; can accurately judge faulty line; do not need running gear to have a power failure, avoid primary equipment to break away from the danger of protection operation.
The purpose of this utility model is achieved through the following technical solutions:
A kind of DC earthing line selector, include variable resistance box, protective device, automation equipment and insulating monitoring device, described direct-flow positive pole is connected with the power end of variable resistance box respectively, is connected with protective device, is connected with automation equipment and insulating monitoring device; The direct current negative pole is connected with protective device respectively, is connected with automation equipment and insulating monitoring device; Its variable resistance box is through earth terminal ground connection, protective device through stake resistance R direct current negative pole connecting place A ground connection.
Described a kind of DC earthing line selector, described direct current negative pole joined with being connected through the pincerlike folder of direct current of protective device.
Described a kind of DC earthing line selector, the resistance of electric bridge is 20k Ω in the described insulating monitoring device.
Advantage of the present utility model and effect are:
1. the utility model can be judged the multipoint earthing fault, selects faulty line.
2. the utility model is not subjected to the influence of transition resistance in the circuit, can accurately judge faulty line.
3. the utility model does not increase earth point, avoids multipoint earthing, the possibility of protection malfunction, tripping.
4. the utility model does not inject any interference volume, avoids because injecting the possibility that interference volume causes the protection malfunction.
5. the utility model does not need running gear to have a power failure, and avoids primary equipment to break away from protection and moves dangerously.
Description of drawings
Fig. 1 is the course of work block scheme of the utility model device;
Fig. 2 is the connection diagram of the utility model device.
Embodiment
Be elaborated below in conjunction with the utility model of embodiment.
The utility model is a kind of based on the DC earthing line selector under the current change quantity principle, and this earthing wire-selecting instrument is centralized procurement sample, storage, calculating, judge, be output in the automation equipment of one.
As shown in Figure 1, the course of work block scheme of the utility model device, this device carries out the real-time follow-up sampling by sampling system to the dc feeder branch road of each operation; Signal processing unit in this device carries out filtering, calculating and logic to the data of gathering to be judged, when positive and negative level is out-of-limit, sends alarm signal, enters malfunction routine simultaneously.In malfunction routine, judgement is that positive level ground connection or negative level ground connection or positive and negative level are mixed.The insulating monitoring instrument of straight-flow system in the transformer station is out of service, earth point and the direct supply of balanced bridge in the disconnection insulating monitoring instrument.Automatically enter the earthing wire-selecting function, by the size of stake resistance in the continuous variation ground connection detector, detect the variable quantity of electric current in each DC loop, therefrom select that bigger branch road of variable quantity, this branch road is ground loop.
Embodiment:
Fig. 2 is the connection diagram of the utility model device, and the positive pole of direct current is connected with the power end of variable resistance box respectively, is connected with protective device, is connected with automation equipment and other device (insulating monitoring device); The negative pole of direct current is connected with protective device respectively, is connected with automation equipment and insulating monitoring device; Its variable resistance box is through earth terminal ground connection, and direct current negative pole connecting place A ground connection, the negative pole of direct current and protective device join through the pincerlike folder of direct current protective device through stake resistance R.If DC voltage is 220V, the resistance of electric bridge is 20k Ω in other device (insulating monitoring device), the stake resistance of assumed fault point is 50 k Ω, so, when the one point earth fault takes place when, the above earth potential of positive and negative dc bus can change because of the generation of earth point, but because straight-flow system is non-direct ground system, so the electric potential difference between positive and negative dc bus can not change, load current in the non-fault line can not change, and in faulty line, will produce the current change quantity of 3.17mA, in addition, constantly change the size that inserts resistance, thereby cause the continuous variation of fault current, according to this Changing Pattern, and which bar circuit the variable quantity of electric current just can be judged earth fault has taken place in the fault branch.
This device be a kind of be the DC earthing line selector of principle based on current change quantity, this earthing wire-selecting instrument is centralized procurement sample, storage, calculating, judge, be output in the automation equipment of one.
This device is applicable to each power generation or supply enterprise, the route selection of DC earthing in the high voltage substation of each large industrial enterprise.
Claims (3)
1. DC earthing line selector, include variable resistance box, protective device, automation equipment and insulating monitoring device, it is characterized in that described direct-flow positive pole is connected with the power end of variable resistance box respectively, is connected with protective device, is connected with automation equipment and insulating monitoring device; The direct current negative pole is connected with protective device respectively, is connected with automation equipment and insulating monitoring device; Its variable resistance box is through earth terminal ground connection, protective device through stake resistance R direct current negative pole connecting place A ground connection.
2. a kind of DC earthing line selector according to claim 1 is characterized in that, described direct current negative pole joined with being connected through the pincerlike folder of direct current of protective device.
3. a kind of DC earthing line selector according to claim 1 is characterized in that, the resistance of electric bridge is 20k Ω in the described insulating monitoring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320225965 CN203178409U (en) | 2013-04-28 | 2013-04-28 | Direct current grounding line selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320225965 CN203178409U (en) | 2013-04-28 | 2013-04-28 | Direct current grounding line selection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203178409U true CN203178409U (en) | 2013-09-04 |
Family
ID=49075087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320225965 Expired - Fee Related CN203178409U (en) | 2013-04-28 | 2013-04-28 | Direct current grounding line selection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203178409U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007396A (en) * | 2014-05-19 | 2014-08-27 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN107015104A (en) * | 2017-05-25 | 2017-08-04 | 广东电网有限责任公司惠州供电局 | A kind of DC system grounding signal tester |
-
2013
- 2013-04-28 CN CN 201320225965 patent/CN203178409U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007396A (en) * | 2014-05-19 | 2014-08-27 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN104007396B (en) * | 2014-05-19 | 2017-01-25 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN107015104A (en) * | 2017-05-25 | 2017-08-04 | 广东电网有限责任公司惠州供电局 | A kind of DC system grounding signal tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20170428 |