CN203798945U - High-voltage capacitor set imbalance detection circuit - Google Patents
High-voltage capacitor set imbalance detection circuit Download PDFInfo
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- CN203798945U CN203798945U CN201420084119.7U CN201420084119U CN203798945U CN 203798945 U CN203798945 U CN 203798945U CN 201420084119 U CN201420084119 U CN 201420084119U CN 203798945 U CN203798945 U CN 203798945U
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- 239000003990 capacitor Substances 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 title abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000012216 screening Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model provides a high-voltage capacitor set imbalance detection circuit. A high-voltage capacitor set comprises a first branch and a second branch. The high-voltage capacitor set imbalance detection circuit also comprises a difference current mutual inductor and a confluence current mutual inductor. The first branch and the second branch oppositely penetrate through the difference current mutual inductor and are converged so that a main trunk loop is formed. The main trunk loop penetrates through the confluence current mutual inductor. The high-voltage capacitor set imbalance detection circuit is simple and reasonable in structure so that a total current value of primary current sensed by the difference current mutual inductor can be reduced, the difference current mutual inductor can work within a linear area of an iron core, and difference current detection precision is greatly enhanced, manufacturing technology of the two current mutual inductors is simplified, and a difference current error caused by mutual inductor characteristic difference brought about by secondary current difference formed by different current mutual inductors is eliminated.
Description
Technical field
The utility model relates to the technical field of high-voltage capacitor group, particularly relates to the uneven testing circuit of a kind of high-voltage capacitor group.
Background technology
For the jumbo high-voltage capacitor group of compensation condenser, wave filter, be usually arranged to two branch roads parallel with one another, under normal operation, wherein the total capacitance of a branch road and the total capacitance of another branch road equate.Once and the capacity cell of any branch road breaks down, by causing, two electric capacitys between branch road are unequal, be also that high-voltage capacitor group breaks down.
Whether break down in order to detect operating high-voltage capacitor group, existing testing circuit as shown in Figure 1, wherein C
1for the total capacitance of branch road 1, C
2for the total capacitance of branch road 2, TA1 is the current transformer of installing on branch road 1, and TA2 is the current transformer of installing on branch road 2.If the no-load voltage ratio of current transformer TA1
the no-load voltage ratio of current transformer TA2
wherein
for the primary current of branch road 1,
for the primary current of branch road 2.The electric capacity C of two branch roads when normal
1=C
2, therefore
for the poor stream that makes to be reflected under capacitor normal condition Current Transformer Secondary side is 0,
must make k
1=k
2=k, k represents the no-load voltage ratio of current transformer.
Therefore according to the actual configuration of the high-voltage capacitor group of Fig. 1, require two current transformer TA1 identical with the theory structure of TA2.Their primary side is conducting rod, and conducting rod, through ring-type iron core, is wound with Secondary Winding on ring-type iron core, and in the ideal situation, the characteristic of TA1 must be in full accord with the characteristic of TA2.
But even if factory has carried out strict detection and screening in manufacturing, still may there is difference in the family curve of two actual current transformers, make the no-load voltage ratio k of current transformer TA1 and TA2
1≠ k
2, this may cause the normal secondary current difference detecting in service | i
1-i
2| ≠ 0, and then cause capacitor bank protection false alarm, even mistrip.Meanwhile, existing this testing circuit, in full accord in order to ensure to form the characteristic of two different current transformers of poor stream, current transformer factory will produce many current transformers and screen, and causes man-hour nervous and waste starting material.
Summary of the invention
The problem that the utility model exists for above-mentioned prior art, proposes a kind of high-voltage capacitor group testing circuit, can eliminate the detection error that the current transformer of different qualities brings, and improves the accuracy of high-voltage capacitor group fault detect.
In order to solve the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of high-voltage capacitor group testing circuit, described high-voltage capacitor group comprises the first branch road and the second branch road, also comprise difference current transformer and interflow current transformer, the first branch road and the second branch road are opposite to each other through difference current transformer, then merge into trunk roads, described trunk roads are through interflow current transformer.
The primary side of described difference current transformer is provided with the first conducting rod and second conducting rod of mutually insulated, and the first conducting rod is connected with the first branch road, and the second conducting rod is connected with the second branch road.On described two conducting rods, pass to after primary current in opposite directions, the secondary side of described difference current transformer can induce according to same no-load voltage ratio the size of difference electric current, can obtain the difference of electric current.
The utility model has the advantages that: simple and reasonable for structure, can utilize difference current transformer to gather the difference between current in the first branch road and the second branch road, the primary current total current value of difference current transformer impression is reduced, make its range of linearity that is operated in iron core, improve accuracy of detection; Interflow current transformer collect the first branch road and the second branch road electric current and, and then according to the difference between current of secondary side of difference current transformer and interflow current transformer and electric current and ratio, judge whether to exist high-voltage capacitor group fault.This imbalance testing circuit has avoided that the characteristic of different current transformers is different and the error brought can also be simplified the technique of detection, screening etc. repeatedly of manufacturing in current transformer.
Brief description of the drawings
Fig. 1 is the uneven testing circuit of existing high-voltage capacitor group;
Fig. 2 is the uneven testing circuit of high-voltage capacitor group of the present utility model;
Fig. 3 is difference current transformer structure schematic diagram of the present utility model;
Description of reference numerals: 1, the first branch road; 2, the second branch road; 3, difference current transformer; 4, interflow current transformer; 5, trunk roads; 6, the first conducting rod; 7, the second conducting rod.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 2, the uneven testing circuit of a kind of high-voltage capacitor group, described high-voltage capacitor group comprises the first branch road 1 and the second branch road 2, also comprise difference current transformer 3 and interflow current transformer 4, the first branch road 1 and the second branch road 2 are opposite to each other through difference current transformer 3, and merging into trunk roads 5, described trunk roads 5 are through interflow current transformer 4.
The first conducting rod 6 and the second conducting rod 7, the first conducting rods 6 that the primary side of described difference current transformer 3 is provided with mutually insulated are connected with the first branch road 1, and the second conducting rod 7 is connected with the second branch road 2.On described two conducting rods, pass to after primary current in opposite directions, the secondary side of described difference current transformer can induce according to no-load voltage ratio the size of difference electric current.
Principle of work of the present utility model is as follows.
Two conducting rods of the primary side of difference current transformer 3 pass to respectively electric current in opposite directions
with
formation first difference stream
the Secondary Winding of difference current transformer 3 will induce secondary difference current i naturally
1-i
2.This secondary difference current i
1-i
2the property difference that does not exist two different current transformers to bring, when therefore primary side high-voltage capacitor group is normal, the value of first difference stream
therefore secondary difference electric current will be also 0.
Two conducting rods of primary side of the first branch road 1 of high-voltage capacitor group and the second branch road 2 are after difference current transformer 3, and two branch roads are merged into trunk roads 5, and the lead-in wire in trunk roads 5 is loaded with the electric current that closes of two branch roads
this closes electric current by collaborating after current transformer 4, will obtain secondary in its secondary side induction and close current i
1+ i
2.According to capacitor protection principle, when
time (working value that setting is this protective device is the parameter of setting), can judge that the electric current in two branch roads of high-voltage capacitor group is unequal, there is fault in high-voltage capacitor group, starts and report to the police or send capacitor group trip signal.
The principle of difference current transformer is shown in Fig. 3.The primary side of difference current transformer has two conducting rods, in the time passing to rightabout electric current in two different conducting rods, primary side at difference mutual inductor is formed to difference electric current, after the difference electric current of this primary side converts by common iron core and Secondary Winding thereof, secondary side difference electric current after its conversion can as one man react the size of a difference electric current, thereby eliminate the problem that existing difference electric current brings by different current transformer collections, the error that different current transformer characteristic difference is brought.
Adopt this difference current transformer and interflow current transformer and utilize the mode of connection in this example, because the quantity of current transformer does not increase, can not increase cost of investment, but can improve the accuracy of detection of the poor stream electric current in two branch roads of high-voltage capacitor group.
The utility model is simple and reasonable for structure, can utilize difference current transformer to gather the difference between current in the first branch road and the second branch road, the primary current total current value of difference current transformer impression is reduced, allow difference operation of current transformers in the range of linearity of its iron core, improve accuracy of detection; Interflow current transformer collect the first branch road and the second branch road electric current and, and then according to the difference between current of the secondary side of current transformer and electric current and ratio, judge whether to exist high-voltage capacitor group fault, the error of having avoided the characteristic difference of different current transformers and bring, can also simplify the technique of detection, screening etc. repeatedly of manufacturing in current transformer.
Above-listed detailed description is for the illustrating of the utility model possible embodiments, and this embodiment is not in order to limit the scope of the claims of the present utility model, does not allly depart from the equivalence that the utility model does and implements or change, and all should be contained in the scope of the claims of this case.
Claims (2)
1. the uneven testing circuit of high-voltage capacitor group, described high-voltage capacitor group comprises the first branch road (1) and the second branch road (2), it is characterized in that, also comprise difference current transformer (3) and interflow current transformer (4), the first branch road (1) and the second branch road (2) are opposite to each other through difference current transformer (3), and merging into trunk roads (5), described trunk roads (5) are through interflow current transformer (4).
2. the uneven testing circuit of high-voltage capacitor group according to claim 1, it is characterized in that, the primary side of described difference current transformer (3) is provided with the first conducting rod (6) and second conducting rod (7) of mutually insulated, the first conducting rod (6) is connected with the first branch road (1), and the second conducting rod (7) is connected with the second branch road (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420084119.7U CN203798945U (en) | 2014-02-26 | 2014-02-26 | High-voltage capacitor set imbalance detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420084119.7U CN203798945U (en) | 2014-02-26 | 2014-02-26 | High-voltage capacitor set imbalance detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203798945U true CN203798945U (en) | 2014-08-27 |
Family
ID=51381149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420084119.7U Expired - Lifetime CN203798945U (en) | 2014-02-26 | 2014-02-26 | High-voltage capacitor set imbalance detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203798945U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144737A (en) * | 2017-06-09 | 2017-09-08 | 华北电力科学研究院有限责任公司 | A kind of series capacitor compensation element fault monitoring method and device |
| CN109375040A (en) * | 2018-12-13 | 2019-02-22 | 国网冀北电力有限公司电力科学研究院 | A kind of state monitoring method, equipment and the system of H bridge capacitor group |
| CN111308244A (en) * | 2020-03-07 | 2020-06-19 | 西南交通大学 | Direct current filter high-voltage capacitor fault positioning method based on current characteristics |
-
2014
- 2014-02-26 CN CN201420084119.7U patent/CN203798945U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144737A (en) * | 2017-06-09 | 2017-09-08 | 华北电力科学研究院有限责任公司 | A kind of series capacitor compensation element fault monitoring method and device |
| CN109375040A (en) * | 2018-12-13 | 2019-02-22 | 国网冀北电力有限公司电力科学研究院 | A kind of state monitoring method, equipment and the system of H bridge capacitor group |
| CN109375040B (en) * | 2018-12-13 | 2024-03-19 | 国网冀北电力有限公司电力科学研究院 | State monitoring method, equipment and system for H-bridge capacitor bank |
| CN111308244A (en) * | 2020-03-07 | 2020-06-19 | 西南交通大学 | Direct current filter high-voltage capacitor fault positioning method based on current characteristics |
| CN111308244B (en) * | 2020-03-07 | 2021-06-25 | 西南交通大学 | Direct current filter high-voltage capacitor fault positioning method based on current characteristics |
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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: 20140827 |
|
| CX01 | Expiry of patent term |