CN203117354U - Looped network detecting device for direct-current system - Google Patents
Looped network detecting device for direct-current system Download PDFInfo
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- CN203117354U CN203117354U CN 201320160447 CN201320160447U CN203117354U CN 203117354 U CN203117354 U CN 203117354U CN 201320160447 CN201320160447 CN 201320160447 CN 201320160447 U CN201320160447 U CN 201320160447U CN 203117354 U CN203117354 U CN 203117354U
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- brachium pontis
- variable resistance
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Abstract
The utility model discloses a looped network detecting device for a direct-current system. The looped network detecting device comprises a variable resistance bridge, a general control analysis unit and a grounding voltage detecting unit. The variable resistance bridge comprises a positive bridge arm and a negative bridge arm. At least one of the positive bridge arm and the negative bridge arm is a variable resistance bridge arm. The general control analysis unit is provided with a signal output end used for controlling resistance changes of the variable resistance bridge arm of the variable resistance bridge, and the signal output end is connected with a control end of the variable resistance bridge arm. The grounding voltage detecting unit is provided with an input end used for acquiring bus voltage to earth of another bus section of the direct-current system, and an output end used for being connected with the general control analysis unit. The looped network detecting device for the direct-current system is simple, and with no low-frequency signal generator and a direct-current blocking capacitor, cost can be effectively reduced. The variable resistance bridge arm can be in resistance control of the general control analysis unit; by adopting variable-step-length way to synchronously compare, injected and acquired signals can be differentiated from interference signals effectively, and misjudgment rate is greatly decreased.
Description
Technical field
The utility model relates to a kind of electric circuit inspection equipment, particularly a kind of straight-flow system looped network pick-up unit.
Background technology
In the electric system of direct supply; " power engineering straight-flow system designing technique rules " are clearly stipulated: in principle from dc load power supply reliability viewpoint, the important transformer station of 110kV and 220kV transformer station will and satisfy relay protection, circuit breaker trip mechanism dualization power demands, regulation and select two group storage batteries from importance.Two group storage batteries adopt the mode of connection of two sections buses, and two sections bus off-the-line operations just often are as Fig. 1.But after operation after a while, owing to after insulation against ground descends or produces ground connection separately, just may cause another section bus voltage-to-ground to change by corresponding earth point, thereby cause follow-up protective device malfunction.So whether detect has connection namely looped network is just quite important between two sections buses.
For reaching the looped network testing goal, existing most of ac-current inject method that adopts is as Fig. 2.Namely inject low-frequency ac signal over the ground at I section bus, by detecting II section bus voltage-to-ground, sort out and I section bus with the amplitude of AC signal frequently, thereby calculate the looped network situation of I, II section bus.There is following problem in this method: 1, because there is electric capacity over the ground in bus, so the signal frequency of injecting can not be too high, this causes the injection of device and samples capacitance all must be very big; 2, owing to have various power supplys and use electric loading in the system, bus multiple harmonic content may occur over the ground, thereby causes flase drop.
Summary of the invention
In order to overcome the deficiencies in the prior art, the utility model provides a kind of designs simplification, the convenient straight-flow system looped network pick-up unit that uses.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of straight-flow system looped network pick-up unit, comprise: be installed in the variable resistor bridge on certain bus section, busbar section of straight-flow system, the variable resistor bridge comprise be attempted by the positive brachium pontis between positive bus-bar and the ground wire and be attempted by negative busbar and ground wire between negative brachium pontis, at least one in positive brachium pontis and the negative brachium pontis is the variable resistor brachium pontis; The master control analytic unit, it is provided with the signal output part for the resistance variations of the variable resistor brachium pontis of control variable resistor bridge, and signal output part is connected with the control end of variable resistor brachium pontis; The ground voltage detecting unit, it is provided with the input end for the bus voltage-to-ground of gathering another bus section, busbar section of straight-flow system, and is provided with the output terminal that is connected to the master control analytic unit.
The beneficial effects of the utility model are: this pick-up unit is by changing variable resistor bridge bus section, busbar section voltage-to-ground of living in, detects the i.e. interlock method of method that specific bus section, busbar section voltage-to-ground changes and whether detects looped network.Namely change the size of this section bus positive and negative busbar resistance to earth by the variable resistor bridge, thereby cause its voltage-to-ground to change, monitor simultaneously whether the voltage-to-ground situation of change that detects a certain specific bus section, busbar section is synchronous with the variation maintenance of above-mentioned voltage-to-ground, if then determine to exist looped network.Said apparatus is simple, does not have low frequency generator, does not have capacitance, can effectively reduce cost; It carries out resistance control by the master control analytic unit to the variable resistor brachium pontis, can take the mode of variable step to compare synchronously, and injection and the signal of gathering can effectively be distinguished with undesired signal, thereby reduces the erroneous judgement probability greatly.
Description of drawings
Fig. 1 is the operating circuit synoptic diagram of straight-flow system looped network;
Fig. 2 is the operating circuit synoptic diagram of pick-up unit in the prior art;
Fig. 3 is operating circuit synoptic diagram of the present utility model.
Embodiment
In order to make goal of the invention of the present utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, not in order to limit the utility model.
With reference to shown in Figure 3, the looped network pick-up unit comprises controllable resistor bridge 2, master control analytic unit 12 and ground voltage detecting unit 11.Master control analytic unit 12 and ground voltage detecting unit 11 generally are integrated in the individual module unit 1, and this module 1 communicates by RS485 and controllable resistor bridge 2.Among Fig. 3, different bus section, busbar sections shows that with bus I section and bus II segment table controllable resistor bridge 1 is arranged on the bus I section, and ground voltage detecting unit 3 detects the bus voltage-to-ground of bus II section.
Master control analytic unit 12 is provided with the signal output part for the resistance variations of the variable resistor brachium pontis of control variable resistor bridge 2, and signal output part is connected with the control end of variable resistor brachium pontis, and as previously mentioned, this signal output part is generally the RS485 communications cable.Master control analytic unit 12 can start the looped network deterministic process according to timing or the artificial mode that triggers, Master Control Unit 12 sends instruction allows controllable resistor bridge 2 carry out the switching of bridge resistance, according to a specific flow process, thereby allows bus I section voltage-to-ground form specific voltage waveform.
Ground voltage detecting unit 11 is provided with the input end for the bus voltage-to-ground of gathering another bus section, busbar section of straight-flow system, and is provided with the output terminal that is connected to master control analytic unit 12.This unit 11 detects bus II section voltage-to-ground synchronously, and be uploaded to the master control analytic unit, the master control analytic unit compares to the situation of change of bus II section voltage-to-ground, if the situation of change and instruction is synchronous, then explanation exists bus II section and bus I section looped network, otherwise does not have looped network.
Below this Device Testing principle is described.
As shown in Figure 3, variable resistor bridge two brachium pontis of figure median generatrix I section all are the variable resistor brachium pontis, the resistance to earth that resistance bridge shown in the bus II section is represented when being the work of this section bus, also can be the fixed resistance bridge that arranges, or other pick-up units be at the set variable resistor bridge of this bus section, busbar section.For the convenience of analyzing, suppose that the arm resistance value R of bus II section resistance bridge is 30K, the positive brachium pontis of the variable resistor bridge of bus I section and the maximum resistance R of negative brachium pontis
1=R
2=30K, the minimum value of variation then is 24K.The selection of above-mentioned resistance value can guarantee that the positive and negative busbar voltage-to-ground of bridge action initiation changes the degree of unbalancedness that causes and can not surpass 10%.
During detection, the positive brachium pontis R1 resistance variations of master control analytic unit control variable resistor bridge, when no looped network, the switching of detected bus II section voltage and variable resistor bridge is asynchronous.
When bus I section is anodal when being connected with bus II section is anodal, bus II section voltage and bridge switching forward are synchronous.
The positive female voltage-to-ground of II section bus this moment:
V
II+ = (V
h1×RR
1 + V
h2×R
1R
2)/(RR
1 + RR
2 +2×R
1R
2 )
When positive brachium pontis moves, R
1=24K, R
2=R=30K:
V
II+ = 106V
When positive brachium pontis recovers, R
1=R
2=R=30K:
V
II+ = 115V
When bus I section positive pole was connected with bus II section negative pole, bus II section voltage and bus I section were anti-inclined to one side.
V
II+ = V
h2 = 230V
By above data two sections bus looped network situations as can be known.
The above be preferred embodiments of the present utility model, but the utility model is not limited to above-described embodiment, as long as it reaches technique effect of the present utility model with any same or similar means, all should fall within the protection domain of the present utility model.
Claims (1)
1. straight-flow system looped network pick-up unit is characterized in that comprising:
Be installed in the variable resistor bridge on certain bus section, busbar section of straight-flow system, the variable resistor bridge comprise be attempted by the positive brachium pontis between positive bus-bar and the ground wire and be attempted by negative busbar and ground wire between negative brachium pontis, at least one in positive brachium pontis and the negative brachium pontis is the variable resistor brachium pontis;
The master control analytic unit, it is provided with the signal output part for the resistance variations of the variable resistor brachium pontis of control variable resistor bridge, and signal output part is connected with the control end of variable resistor brachium pontis;
The ground voltage detecting unit, it is provided with the input end for the bus voltage-to-ground of gathering another bus section, busbar section of straight-flow system, and is provided with the output terminal that is connected to the master control analytic unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320160447 CN203117354U (en) | 2013-04-02 | 2013-04-02 | Looped network detecting device for direct-current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320160447 CN203117354U (en) | 2013-04-02 | 2013-04-02 | Looped network detecting device for direct-current system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203117354U true CN203117354U (en) | 2013-08-07 |
Family
ID=48897689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320160447 Expired - Lifetime CN203117354U (en) | 2013-04-02 | 2013-04-02 | Looped network detecting device for direct-current system |
Country Status (1)
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| CN (1) | CN203117354U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360215A (en) * | 2014-11-12 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Detection device for multi-point earthing fault of small bus N600 |
| CN106646141A (en) * | 2017-02-28 | 2017-05-10 | 深圳市汇业达通讯技术有限公司 | Automatic detection method and system for direct current power supply bus loop closing |
| CN107045092A (en) * | 2017-05-16 | 2017-08-15 | 广东电网有限责任公司惠州供电局 | One kind station change low-voltage alternating-current looped network intelligent detection device and method |
| CN107091969A (en) * | 2017-05-15 | 2017-08-25 | 广东电网有限责任公司惠州供电局 | A kind of looped network of DC power intelligent detection device and method |
| CN111398739A (en) * | 2020-04-20 | 2020-07-10 | 广东电网有限责任公司梅州供电局 | Device and method for detecting abnormal parallel of direct current system for station |
| CN112187396A (en) * | 2019-07-05 | 2021-01-05 | 许继集团有限公司 | Communication system and method suitable for flexible direct current converter valve |
-
2013
- 2013-04-02 CN CN 201320160447 patent/CN203117354U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360215A (en) * | 2014-11-12 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Detection device for multi-point earthing fault of small bus N600 |
| CN104360215B (en) * | 2014-11-12 | 2017-10-03 | 江苏省电力公司淮安供电公司 | N600 multipoint earth faults detection means |
| CN106646141A (en) * | 2017-02-28 | 2017-05-10 | 深圳市汇业达通讯技术有限公司 | Automatic detection method and system for direct current power supply bus loop closing |
| CN107091969A (en) * | 2017-05-15 | 2017-08-25 | 广东电网有限责任公司惠州供电局 | A kind of looped network of DC power intelligent detection device and method |
| CN107091969B (en) * | 2017-05-15 | 2023-03-31 | 广东电网有限责任公司惠州供电局 | Intelligent detection device and method for direct current looped network |
| CN107045092A (en) * | 2017-05-16 | 2017-08-15 | 广东电网有限责任公司惠州供电局 | One kind station change low-voltage alternating-current looped network intelligent detection device and method |
| CN107045092B (en) * | 2017-05-16 | 2023-04-07 | 广东电网有限责任公司惠州供电局 | Intelligent detection device and method for low-voltage alternating-current ring network for station |
| CN112187396A (en) * | 2019-07-05 | 2021-01-05 | 许继集团有限公司 | Communication system and method suitable for flexible direct current converter valve |
| CN112187396B (en) * | 2019-07-05 | 2022-10-25 | 许继集团有限公司 | Communication system and method suitable for flexible direct current converter valve |
| CN111398739A (en) * | 2020-04-20 | 2020-07-10 | 广东电网有限责任公司梅州供电局 | Device and method for detecting abnormal parallel of direct current system for station |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130807 |