CN102445655A - Grounding vector sampling circuit for molded case circuit breaker - Google Patents
Grounding vector sampling circuit for molded case circuit breaker Download PDFInfo
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- CN102445655A CN102445655A CN2011102957324A CN201110295732A CN102445655A CN 102445655 A CN102445655 A CN 102445655A CN 2011102957324 A CN2011102957324 A CN 2011102957324A CN 201110295732 A CN201110295732 A CN 201110295732A CN 102445655 A CN102445655 A CN 102445655A
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Abstract
The invention discloses a grounding vector sampling circuit for a molded case circuit breaker. The sampling circuit comprises a sampling signal transformer set and a vector processing circuit, wherein the sampling signal transformer set comprises a plurality of transformers; each transformer is provided with two output ends; one output end of each of the plurality of transformers is connected to serve as a common end of the sampling signal transformer set; the vector processing circuit comprises a plurality of parallel branch circuits which are matched with the transformers; each branch circuit is formed by connecting two diodes and a resistor in series; the common end of the sampling signal transformer set is connected between two diodes of one branch circuit; the other output ends of the plurality of transformers are all connected between the two diodes of the other branch circuits; and the branch circuits comprise power output ends and operation signal output ends. The sampling circuit has the advantages of undistorted sampling vector signal, wide signal range, high accuracy and low self-generated power supply starting point.
Description
Technical field
The present invention relates to a kind of ground connection vector sample circuit, relate in particular to a kind of ground connection vector sample circuit that is used for breaker of plastic casing.
Background technology
At present; The detection mode that has ground protection function breaker of plastic casing on the market all adopts secondary ground connection mutual inductor sample or adopts programmed algorithm to handle, and all there is drawback in these methods: first and second ground connection mutual inductor sample, though programmed algorithm is simple; But hardware configuration is complicated; Take the original just very compact space of breaker of plastic casing, influenced by the inherent characteristic of primary current mutual inductor, have problems such as sampled signal error is big, the work start-up point is high, protection domain is little; Two, the method for programmed algorithm processing is fairly simple on hardware configuration, but influenced by the inherent characteristic of primary current mutual inductor, not only has above-mentioned defective, also has problems such as programmed algorithm complicacy.
Summary of the invention
To the problems referred to above; The object of the present invention is to provide a kind of ground connection vector sample circuit that is used for breaker of plastic casing; It has the advantages that the sample vector signal is undistorted, range of signal is wide, accuracy is high and the authigenic power supply start-up point is low, to solve shortcoming of the prior art.
The objective of the invention is to realize through following technical scheme:
A kind of ground connection vector sample circuit that is used for breaker of plastic casing; It comprises sampled signal mutual inductor group and vector treatment circuit; Wherein, said sampled signal mutual inductor group comprises several mutual inductors, and each mutual inductor has two output terminals; An output terminal of said several mutual inductors is connected as the common port of sampled signal mutual inductor group; Said vector treatment circuit comprises several parallelly connected parallel circuits that cooperate mutual inductor, and said parallel circuit is in series by two diodes and a resistance, and the common port of said sampled signal mutual inductor group is connected between two diodes of one of them parallel circuit; Another output terminal of said several mutual inductors all is connected between two diodes of other parallel circuits, and said parallel circuit comprises power output end and computing signal output part.
Especially, said sampled signal mutual inductor group comprises four mutual inductors, and said vector treatment circuit comprises the parallel circuit of five parallel connections of corresponding four mutual inductors.
Beneficial effect of the present invention does, one of output terminal of the mutual inductor of the said ground connection vector sample circuit that is used for breaker of plastic casing is used for acquired signal, simultaneously as the authigenic power supply output of subsequent conditioning circuit.Another output terminal of mutual inductor is connected in a bit as common port, do not having under the situation of earth fault, the vector of common port with equal 0; After earth fault occurring, produce the vector of ground current common port and be not equal to 0, thereby produce ground signalling, subsequent process circuit is according to the value output control signal corresponding of this signal.And utilize the unilateal conduction characteristic of diode, signal is handled, positive half-wave is exported as power supply, and negative half-wave greatly reduces authigenic power supply start-up point and signal acquisition point as the output of computing signal, has enlarged protection domain, has improved the protection precision.
Description of drawings
According to accompanying drawing and embodiment the present invention is done further explain below.
Fig. 1 is used for the physical circuit figure of the ground connection vector sample circuit of breaker of plastic casing for the present invention.
Embodiment
Please with reference to shown in Figure 1, Fig. 1 is used for the physical circuit figure of the ground connection vector sample circuit of breaker of plastic casing for the present invention.
In the present embodiment; A kind of ground connection vector sample circuit that is applicable to three-phase four-wire system is provided; It comprises sampled signal mutual inductor group of being made up of four mutual inductors and the vector treatment circuit of being made up of the parallel circuit of five parallel connections, and said four mutual inductors have output terminals A 1, A2, B1, B2, C1, C2, N1, N2; Said output terminals A 1, B1, C1, N1 are used for gathering the signal of A, B, C, N; Export as the authigenic power supply of subsequent conditioning circuit simultaneously; Said output terminals A 2, B2, C2 and N2 are connected in a bit as common port G, and said common port G is connected between diode D51 and the D52, and said diode D51, D52 and resistance R 5 are formed a parallel circuit; Said output terminals A 1 is connected between diode D11 and the D12; The parallel circuit that said diode D11, D12 and resistance R 1 are formed, said output terminal B1 is connected between diode D21 and the D22, the parallel circuit that said diode D21, D22 and resistance R 2 are formed; Said output terminal C1 is connected between diode D31 and the D32; The parallel circuit that said diode D31, D32 and R3 form, said output terminal N1 is connected between diode D41 and the D42, the parallel circuit that said diode D41, D42 and R4 form.
The negative pole of said diode D11, D21, D31, D41 and D51 connects as power output end; Draw A phase computing signal output part between said diode D12 and the resistance R 1; Draw B phase computing signal output part between said diode D22 and the resistance R 2; Draw C phase computing signal output part between said diode D32 and the resistance R 3, draw N phase computing signal output part between said diode D42 and the resistance R 4, draw ground signalling between said diode D52 and the resistance R 5.
One of the output terminal of the mutual inductor of the above-mentioned ground connection vector sample circuit that is used for breaker of plastic casing A1, B1, C1, N1 are used for gathering the signal of A, B, C, N, simultaneously as the authigenic power supply output of subsequent conditioning circuit.Common port G is not having under the situation of earth fault, the vector that G is ordered with equal 0; After earth fault occurring, produce ground current, the vector that G order be not equal to 0, thereby produce ground signalling, subsequent process circuit is exported control signal corresponding according to the value of this signal.Utilize the unilateal conduction characteristic of diode, the signal of A, B, C, N, G is handled, positive half-wave is exported as power supply; Negative half-wave greatly reduces authigenic power supply start-up point and signal acquisition point as the output of computing signal, has enlarged protection domain; Improved the protection precision, in addition, the said ground connection vector sample circuit that is used for breaker of plastic casing is once to sample in real time; There is not second-order distortion, not influenced by programmed algorithm.The sample vector signal is undistorted except having, range of signal is wide, the accuracy advantages of higher, also have the low advantage in authigenic power supply start-up point.
Above embodiment has just set forth ultimate principle of the present invention and characteristic; The present invention is not limited by above-mentioned example; Under the prerequisite that does not break away from spirit and scope of the invention; The present invention is applicable to that in addition three-phase three-wire system or other have the product of ground protection function, and these variations and change all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (2)
1. ground connection vector sample circuit that is used for breaker of plastic casing; It comprises sampled signal mutual inductor group and vector treatment circuit; It is characterized in that: said sampled signal mutual inductor group comprises several mutual inductors; Each mutual inductor has two output terminals, and an output terminal of said several mutual inductors is connected as the common port of sampled signal mutual inductor group, and said vector treatment circuit comprises several parallelly connected parallel circuits that cooperate mutual inductor; Said parallel circuit is in series by two diodes and a resistance; The common port of said sampled signal mutual inductor group is connected between two diodes of one of them parallel circuit, and another output terminal of said several mutual inductors all is connected between two diodes of other parallel circuits, and said parallel circuit comprises power output end and computing signal output part.
2. the ground connection vector sample circuit that is used for breaker of plastic casing according to claim 1; It is characterized in that: said sampled signal mutual inductor group comprises four mutual inductors, and said vector treatment circuit comprises the parallel circuit of five parallel connections of corresponding four mutual inductors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102957324A CN102445655A (en) | 2011-09-27 | 2011-09-27 | Grounding vector sampling circuit for molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102957324A CN102445655A (en) | 2011-09-27 | 2011-09-27 | Grounding vector sampling circuit for molded case circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN102445655A true CN102445655A (en) | 2012-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102957324A Pending CN102445655A (en) | 2011-09-27 | 2011-09-27 | Grounding vector sampling circuit for molded case circuit breaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374986A (en) * | 2014-11-18 | 2015-02-25 | 浙江正泰电器股份有限公司 | Novel current sampling circuit and electronic controller of breaker |
| CN105391044A (en) * | 2015-11-26 | 2016-03-09 | 南京大全电气研究院有限公司 | Earth fault current detection circuit and method |
-
2011
- 2011-09-27 CN CN2011102957324A patent/CN102445655A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374986A (en) * | 2014-11-18 | 2015-02-25 | 浙江正泰电器股份有限公司 | Novel current sampling circuit and electronic controller of breaker |
| CN105391044A (en) * | 2015-11-26 | 2016-03-09 | 南京大全电气研究院有限公司 | Earth fault current detection circuit and method |
| CN105391044B (en) * | 2015-11-26 | 2017-10-20 | 江苏大全凯帆开关有限公司 | A kind of earth-fault current detection circuit and method |
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Application publication date: 20120509 |