CN103247489B - The circuit breaker electronic release of no ground current sample Special mutual-inductor - Google Patents
The circuit breaker electronic release of no ground current sample Special mutual-inductor Download PDFInfo
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- CN103247489B CN103247489B CN201310180834.0A CN201310180834A CN103247489B CN 103247489 B CN103247489 B CN 103247489B CN 201310180834 A CN201310180834 A CN 201310180834A CN 103247489 B CN103247489 B CN 103247489B
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Abstract
The present invention relates to a kind of circuit breaker electronic release of no ground current sample Special mutual-inductor.Be characterized in.Phase current is converted to low voltage potential signal by the hollow current transformer of three-phase by main circuit current respectively, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit, and by resistance, three groups of low pass active filter circuits of electric capacity and integrated circuit composition, electromagnetic interference in filtering major loop, each phase electric potential signal through filtering enters the subtraction circuit be made up of resistance and integrated circuit and carries out computing to signal, operation result is sent out greatly by being carried out anti-phase ratio by resistance and integrated circuit proportion of composing operational amplifier, the AD analog-to-digital conversion port that the earth current signal that collection union is crossed taps into microprocessor processes.The present invention decreases earth current sampling Special mutual-inductor when carrying out earth current signal sampling, saved manufacturing cost, reduced installation volume, improve the access difficulty of circuit breaker in operational system, and structure has been simple.
Description
Technical field
The invention belongs to a kind of low-voltage circuit breaker electronic trip unit, particularly relate to a kind of circuit breaker electronic release of no ground current sample Special mutual-inductor.
Background technology
Current low-voltage electrical apparatus particularly electronic breaker ground protection is generally adopted as the collection that zero-sequence current sampling principle carries out signal; cause its zero sequence current mutual inductor will by U, V, W three-phase loop of circuit breaker in actual applications; to splice at the rear side of circuit breaker and note the zero sequence current mutual inductor of envelope with three-phase metallic conductor by insulating material; circuit breaker integral installation volume is caused to strengthen like this; and overall circuit breaker cost is increased; cause the volume of complete cabinet to strengthen, or affect integral installation mode.
Summary of the invention
The present invention provides a kind of circuit breaker electronic release of no ground current sample Special mutual-inductor for solving in known technology the technical problem that exists.
The technical scheme that the present invention takes for the technical problem existed in solution known technology is: described electronic trip unit comprises three phase air core current transformer (CT1 of the common phase alignment circuit sampling used, CT2, CT3, ), described three phase air core current transformer (CT1, CT2, CT3, ) primary side respectively its three phase main circuit conductors of connecting breaker, secondary side output one end of first-phase air core current transformer (CT1) connects the first electric capacity (C1), outside one end of first resistance (R1) and one end of the first integrated circuit (U1) in-phase end, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously, the inverting input of described first integrated circuit (U1) is connected with output, and is connected with one end of the 6th resistance (R6), second-phase air core current transformer (CT2) secondary side output one end connects the second electric capacity (C2), outside one end of second resistance (R2) and one end of the second integrated circuit (U2) in-phase end, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously, the inverting input of described second integrated circuit (U2) is connected with output, and is connected with one end of the 5th resistance (R5), third phase air core current transformer (CT3) secondary side output one end connects the 3rd electric capacity (C3), outside one end of 3rd resistance (R3) and one end of the 3rd integrated circuit (U3) in-phase end, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously, the inverting input of described 3rd integrated circuit (U3) is connected with output, and is connected with one end of the 4th resistance (R4), three phase air core current transformers (CT1, CT2, CT3,) the secondary side other end and first, second and third resistance described (R1, R2, R3), the other end of described first, second and third electric capacity (C1, C2, C3) is connected with reference potential zero potential, the inverting input of the 4th integrated circuit (U4) is connected with the other end of described fourth, fifth, six resistance (R4, R5, R6), the in-phase input end of described 4th integrated circuit (U4) is connected with one end of the 7th resistance (R7), and the other end of described 7th resistance (R7), one end of the 8th resistance (R8) are connected with reference potential zero potential, the output of described 4th integrated circuit (U4) connects one end of the tenth resistance (R10), the other end of described tenth resistance (R10) is connected with one end of the 9th resistance (R9) and the 5th integrated circuit (U5) inverting input, the in-phase input end of described 5th integrated circuit (U5) is connected with the other end of described 8th resistance (R8), and the output of described 5th integrated circuit (U5) is connected to the other end and the microprocessor of described 9th resistance (R9).
The advantage that the present invention has and good effect are: present principles adopts and uses three cored current sampling instrument transformers to be signal input apparatus by primary electron formula circuit breaker electronic release body, the secondary side output potential signal of its every air core current transformer is while entering phase current sampling circuit, output potential signal enters involved Special grounding Acquisition Circuit, first this circuit carries out phase calibration and filtering to the secondary side electric potential signal of phase current air core current transformer, after the discretization error eliminating three-phase air core current transformer self and phase error, enter an add circuit be made up of integrated circuit and resistive element and computing is carried out to three-phase signal, it exports the vector result being three-phase current, the micro-process of its vector result access circuit breaker electric sub-controller
This circuit decreases earth current sampling Special zero current mutual-inductor when carrying out earth current signal sampling, saved manufacturing cost, reduced installation volume, improve the access difficulty of circuit breaker in operational system, and have the features such as structure is simple.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
For content of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
As shown in Figure 1, three-phase air core current transformer CT1, CT2, CT3, primary side respectively its three-phase main circuit conductor of connecting breaker, secondary side output one end of air core current transformer CT1 connects electric capacity C1, outside one end of resistance R1 and one end of integrated circuit U1 in-phase end, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously; The inverting input of integrated circuit U1 is connected with output, and is connected with one end of resistance R6; Air core current transformer CT2 secondary side output one end connects electric capacity C2, outside one end of resistance R2 and one end of integrated circuit U2 in-phase end, is connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously; The inverting input of integrated circuit U2 is connected with output, and is connected with one end of resistance R5; Air core current transformer CT3 secondary side output one end connects electric capacity C3, outside one end of resistance R3 and one end of integrated circuit U3 in-phase end, is connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously; The inverting input of integrated circuit U3 is connected with output, and is connected with one end of resistance R4; Air core current transformer CT1, CT2, CT3, the secondary side other end and resistance R1, R2, R3, the other end of electric capacity C1, C2, C3 is connected with reference potential zero potential; The inverting input of integrated circuit U4 is connected with the other end of resistance R4, R5, R6, and the in-phase input end of integrated circuit U4 is connected with one end of resistance R7, and the other end of resistance R7, one end of resistance R8 are connected with reference potential zero potential; One end of the output contact resistance R10 of integrated circuit U4, the other end of resistance R10 is connected with one end of resistance R9 and integrated circuit U5 inverting input, the in-phase input end of integrated circuit U5 is connected with the other end of resistance R8, and the output of integrated circuit U5 is connected to the other end and the microprocessor of resistance R9.
Its implementation procedure is: major loop phase current is converted to low voltage potential signal by hollow current transformer CT1, CT2, CT3 by main circuit current respectively, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit, its signal enters this patent earth current sample circuit simultaneously, it is by R1, C1, U1, R2, C2, U2, R3, C3, U3, three groups of low pass active filter circuits of composition, filtering is carried out to the electromagnetic interference in major loop, removes major loop electromagnetic interference; Each phase electric potential signal after filtering enters a subtraction circuit be made up of resistance R4, R5, R6, R7 and integrated circuit U4 and carries out computing to signal, its operation result is by after carrying out anti-phase scale amplifying by resistance R10, R9, R8 and integrated circuit U5 proportion of composing operational amplifier, and the AD analog-to-digital conversion port that the earth current signal that collection union is crossed taps into microprocessor processes.
Claims (1)
1. the circuit breaker electronic release of a no ground current sample Special mutual-inductor, described electronic trip unit comprises three phase air core current transformer (CT1 of the common phase alignment circuit sampling used, CT2, CT3, ), described three phase air core current transformer (CT1, CT2, CT3, ) primary side respectively its three phase main circuit conductors of connecting breaker, it is characterized in that: secondary side output one end of first-phase air core current transformer (CT1) connects the first electric capacity (C1), outside one end of first resistance (R1) and one end of the first integrated circuit (U1) in-phase end, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously, the inverting input of described first integrated circuit (U1) is connected with output, and is connected with one end of the 6th resistance (R6), second-phase air core current transformer (CT2) secondary side output one end connects the second electric capacity (C2), outside one end of second resistance (R2) and one end of the second integrated circuit (U2) in-phase end, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously, the inverting input of described second integrated circuit (U2) is connected with output, and is connected with one end of the 5th resistance (R5), third phase air core current transformer (CT3) secondary side output one end connects the 3rd electric capacity (C3), outside one end of 3rd resistance (R3) and one end of the 3rd integrated circuit (U3) in-phase end, be connected to primary electron formula circuit breaker electronic release phase line current sampling processing circuit simultaneously, the inverting input of described 3rd integrated circuit (U3) is connected with output, and is connected with one end of the 4th resistance (R4), three phase air core current transformers (CT1, CT2, CT3,) the secondary side other end and first, second and third resistance described (R1, R2, R3), the other end of described first, second and third electric capacity (C1, C2, C3) is connected with reference potential zero potential, the inverting input of the 4th integrated circuit (U4) is connected with the other end of described fourth, fifth, six resistance (R4, R5, R6), the in-phase input end of described 4th integrated circuit (U4) is connected with one end of the 7th resistance (R7), and the other end of described 7th resistance (R7), one end of the 8th resistance (R8) are connected with reference potential zero potential, the output of described 4th integrated circuit (U4) connects one end of the tenth resistance (R10), the other end of described tenth resistance (R10) is connected with one end of the 9th resistance (R9) and the 5th integrated circuit (U5) inverting input, the in-phase input end of described 5th integrated circuit (U5) is connected with the other end of described 8th resistance (R8), and the output of described 5th integrated circuit (U5) is connected to the other end and the microprocessor of described 9th resistance (R9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310180834.0A CN103247489B (en) | 2013-05-16 | 2013-05-16 | The circuit breaker electronic release of no ground current sample Special mutual-inductor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310180834.0A CN103247489B (en) | 2013-05-16 | 2013-05-16 | The circuit breaker electronic release of no ground current sample Special mutual-inductor |
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| CN103247489A CN103247489A (en) | 2013-08-14 |
| CN103247489B true CN103247489B (en) | 2015-11-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271763B (en) * | 2017-06-20 | 2019-07-23 | 常熟开关制造有限公司(原常熟开关厂） | Current sampling circuit, electronic trip unit, breaker |
| CN108711827B (en) * | 2018-04-27 | 2023-11-24 | 天津市百利电气有限公司 | Signal processing device of leakage circuit breaker |
| JP6947302B2 (en) * | 2018-06-08 | 2021-10-13 | 三菱電機株式会社 | Electronic circuit breaker |
| CN110310808A (en) * | 2019-07-09 | 2019-10-08 | 威胜电气有限公司 | A kind of current transformer and breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170367A (en) * | 1985-01-29 | 1986-07-30 | Atreus Enterprises Limited | Residual current device |
| CN201541115U (en) * | 2009-11-19 | 2010-08-04 | 天津市百利电气有限公司 | Intelligent controller with voltage protection module |
| CN202363871U (en) * | 2011-11-24 | 2012-08-01 | 天津市百利电气有限公司 | Circuit breaker having switching-on instant protection function |
| CN203277253U (en) * | 2013-05-16 | 2013-11-06 | 天津市百利电气有限公司 | Electronic tripping device of low-voltage breaker of non-zero sequence current mutual inductor |
-
2013
- 2013-05-16 CN CN201310180834.0A patent/CN103247489B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170367A (en) * | 1985-01-29 | 1986-07-30 | Atreus Enterprises Limited | Residual current device |
| CN201541115U (en) * | 2009-11-19 | 2010-08-04 | 天津市百利电气有限公司 | Intelligent controller with voltage protection module |
| CN202363871U (en) * | 2011-11-24 | 2012-08-01 | 天津市百利电气有限公司 | Circuit breaker having switching-on instant protection function |
| CN203277253U (en) * | 2013-05-16 | 2013-11-06 | 天津市百利电气有限公司 | Electronic tripping device of low-voltage breaker of non-zero sequence current mutual inductor |
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