CN204179639U - Intelligent leakage circuit breaker - Google Patents
Intelligent leakage circuit breaker Download PDFInfo
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- CN204179639U CN204179639U CN201420703125.6U CN201420703125U CN204179639U CN 204179639 U CN204179639 U CN 204179639U CN 201420703125 U CN201420703125 U CN 201420703125U CN 204179639 U CN204179639 U CN 204179639U
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Abstract
The utility model relates to a kind of electric power system leak current fault detection method and device, and its device forms three phase mains transformer by three single-phase transformers by YN.yn.d0.Single-phase transformer primary winding coils L1, L2, L3 are connected into the public termination the earth of Y type, secondary exports as double winding coil, first group of coil L11, L21, L31 are connected into Y type common port connected control system ground, and three components be you can well imagine for A phase, B phase, the voltage detection signal of C phase and the voltage source needed for control system.Second group of coil L12, L22, L32 compose in series zero sequential potential transformer by head and the tail, utilize the every relatively Insulation monitoring principle of three-phase zero sequential potential transformer, detect the opening change in voltage situation of zero sequential potential transformer to judge whether low-voltage power supply system exists electric leakage and grounding phenomenon.The utility model greatly reduces electric power system electric leakage erroneous judgement and has a power failure, and avoids human electric shock and to be failure to actuate phenomenon, ensure personnel's life security.
Description
Technical field
The utility model relates to electric power system leak current fault detection technique field, is specifically related to a kind of intelligent leakage circuit breaker.
Background technology
Existing intelligent leakage circuit breaker, normally judges whether electric power system leaks electricity, because the generation of zero sequence current mutual inductor electric current has many reasons: three-phase current unbalance by the size of the zero-sequence current detecting zero sequence current mutual inductor; Imbalance of three-phase voltage; Have DC component in using electricity system, these factors all can cause zero sequence current mutual inductor to produce induced current.Electric power system is along with the increasing of power consumption, and when the increasing of especially single-phase power consumption, the induced current of zero sequence current mutual inductor can be very large, and hundreds of milliampere more than 1 ampere at most at least, such result will cause residual current circuit breaker misoperation to be judged as electric leakage.Therefore to detect the result precision whether electric power system leak electricity not high for existing method, usually can judge by accident, cause improper power failure, and more seriously cause human electric shock to be failure to actuate, injure fail safe.
Summary of the invention
The purpose of this utility model is the defect in order to overcome prior art, provides the intelligent leakage circuit breaker that a kind of electric power system detection of electrical leakage precision is high, reduce erroneous judgement action, improve electrical safety.
For achieving the above object, the utility model design intelligent leakage circuit breaker, comprise the single-phase transformer A, single-phase transformer B and the single-phase transformer C that are connected to electric power system three-phase voltage input, single-phase transformer A, B, C form three phase mains transformer, the primary winding coils L1 of single-phase transformer A, B, C, L2, L3 are connected into Y type, the public termination the earth of Y type winding coil, other three ends are drawn respectively and are connected with three-phase voltage input, described single-phase transformer A, B, the secondary winding coil of C exports as double winding coil, first group of coil L11, L21, L31 is connected into y type, the common port connected control system ground of y type winding coil, other three ends of y type winding coil provide circuit breaker A phase respectively, B phase, C phase-voltage measurement signal and the voltage source needed for control system, single-phase transformer A, B, second group of coil L12 of the secondary output of C, L22, L32 composes in series zero sequential potential transformer by head and the tail, the opening two ends of zero sequential potential transformer connect the ac input end of rectifier bridge, the output of described rectifier bridge is connected with filter capacitor and dividing potential drop components and parts, described dividing potential drop components and parts are connected to the input input of MCU control module, described single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, C phase voltage output is connected in parallel to rectifier bridge successively, pressurizer and filter capacitor, described output end of voltage stabilizer connects the energization input of MCU control module.
The output of above-mentioned rectifier bridge is connected in parallel to filter capacitor C5, filter capacitor C6, described filter capacitor C5, one end ground connection of filter capacitor C6, described filter capacitor C6 two ends are connected in parallel to the divider resistance R6 be connected in series, divider resistance R5, divider resistance R10, the described divider resistance R5 that is connected in series and divider resistance R10 two ends are connected in parallel to one or more divider resistance group, each divider resistance group is connected in series by two divider resistances, wherein the divider resistance two ends of ground connection are connected in parallel to voltage stabilizing didoe, the high voltage end of the divider resistance of each ground connection is all connected to the input input of MCU control module.
Above-mentioned single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, one end of C phase voltage is respectively by grading resistor R20, grading resistor R21, grading resistor R22 connects together and is connected to the first input end of bridge rectifier, single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, the other end of C phase voltage connects together and is connected to the second input of bridge rectifier, described bridge rectifier output is connected in parallel to filter capacitor C6, filter capacitor C1, the two ends of filter capacitor C1 connect input pin and the ground of three terminal regulator U1 respectively, filter capacitor C2 is connected in parallel between the output of described three terminal regulator U1 and ground, filter capacitor C3, the output of described three terminal regulator U1 is connected with the energization input of described MCU control module.
The utility model intelligent leakage circuit breaker, utilize the every relatively Insulation monitoring principle of three-phase zero sequential potential transformer, the opening change in voltage situation detecting zero sequential potential transformer is to judge low-voltage power supply system and whether there is electric leakage and grounding phenomenon detects each phase voltage situation of change; Detect each phase current situation of change to analyze, whether whether the work that accurately can judge current power scene normally or break down.Detection method of the present utility model possesses the necessary condition that three-phase power supply system grid power leakage detects: zero-sequence current will have loop over the ground, the drain conditions of electric power system accurately can be detected when residual voltage occurs, greatly reduce electric power system electric leakage erroneous judgement to have a power failure, avoid human electric shock to be failure to actuate phenomenon, ensure personnel's life security.
Accompanying drawing explanation
Fig. 1 is intelligent leakage circuit breaker wiring schematic diagram of the present utility model;
Fig. 2 is intelligent leakage circuit breaker circuit theory diagrams of the present utility model;
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Intelligent leakage circuit breaker as illustrated in fig. 1 and 2, comprise the single-phase transformer A, single-phase transformer B and the single-phase transformer C that are connected to electric power system three-phase voltage input, single-phase transformer A, B, C form three phase mains transformer, the primary winding coils L1 of single-phase transformer A, B, C, L2, L3 are connected into Y type, the public termination the earth of Y type winding coil, other three ends are drawn respectively and are connected with three-phase voltage input, the secondary winding coil of single-phase transformer A, B, C exports as double winding coil, first group of coil L11, L21, L31 are connected into y type, the common port connected control system ground of y type winding coil, other three ends of y type winding coil provide circuit breaker A phase, B phase, C phase-voltage measurement signal and the voltage source needed for control system respectively, second group of coil L12, L22, L32 that the secondary of single-phase transformer A, B, C exports compose in series zero sequential potential transformer by head and the tail, and the opening two ends of zero sequential potential transformer connect the ac input end of rectifier bridge, the output of rectifier bridge is connected in parallel to filter capacitor C5, filter capacitor C6, filter capacitor C5, one end ground connection of filter capacitor C6, filter capacitor C6 two ends are connected in parallel to the divider resistance R6 be connected in series, divider resistance R5, divider resistance R10, the divider resistance R5 be connected in series and divider resistance R10 two ends are connected in parallel to one or more divider resistance group, each divider resistance group is connected in series by two divider resistances, wherein the divider resistance two ends of ground connection are connected in parallel to voltage stabilizing didoe, the high voltage end of the divider resistance of each ground connection is all connected to the input input of MCU control module.
Single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, one end of C phase voltage is respectively by grading resistor R20, grading resistor R21, grading resistor R22 connects together and is connected to the first input end of bridge rectifier, single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, the other end of C phase voltage connects together and is connected to the second input of bridge rectifier, bridge rectifier output is connected in parallel to filter capacitor C6, filter capacitor C1, the two ends of filter capacitor C1 connect input pin and the ground of three terminal regulator U1 respectively, filter capacitor C2 is connected in parallel between the output of three terminal regulator U1 and ground, filter capacitor C3, the output of three terminal regulator U1 is connected with the energization input of MCU control module.
Intelligent leakage circuit breaker of the present utility model forms three phase mains transformer by three single-phase transformers by YN.yn.d0.Single-phase transformer primary winding coils L1, L2, L3 are connected into the public termination the earth of Y type, secondary exports as double winding coil, first group of coil L11, L21, L31 are connected into Y type common port connected control system ground, and three components be you can well imagine for A phase, B phase, the voltage detection signal of C phase and the voltage source needed for control system.Second group of coil L12, L22, L32 compose in series zero sequential potential transformer by head and the tail, utilize the every relatively Insulation monitoring principle of three-phase zero sequential potential transformer, detect the opening change in voltage situation of zero sequential potential transformer to judge whether low-voltage power supply system exists electric leakage and grounding phenomenon, and transformer winding connection is shown in Figure 1.
The every phase voltage a1 of secondary winding three-phase voltage, b1, c1, a2, b2, c2 be every phase mutual deviation 120 degree when three-phase voltage balances, and at this moment the vector sum of d0 is zero.Namely
when three-phase electricity is pressed with a phase generation electric leakage, d0 is non-vanishing for secondary windings in series vector sum voltage, and its large young pathbreaker determines with the resistance of the earth resistance of this phase.D0 is little for earth resistance big uncork voltage, and earth resistance little opening voltage d0 is large, and when this phase dead ground, opening voltage d0 will reach maximum voltage value.By opening voltage d0 two ends access rectifier bridge ac input end, the output of rectifier bridge is through filter capacitor C5, C6 filter capacitor and divider resistance and voltage stabilizing didoe composition insulation against ground voltage detection signal, detection signal divides Four composition Wei UK1, UK2, UK3, UK4, four groups of elements of being correlated with and circuit connect to be consulted shown in Fig. 2, UK1, UK2, UK3, corresponding to the intelligent control system MCU control module respectively interface of UK4 direct current signal connects, MCU control module is passed through UK1, UK2, UK3, UK4 signal transacting, detect current detection zero sequence current signal situation of change, and detect each phase voltage situation of change, detect each phase current situation of change to analyze, whether normally or whether break down the work that accurately can judge current power scene, and make corresponding process.
Intelligent leakage circuit breaker provides MCU control module electricity consumption: secondary winding L11, L21, L31 are connected into Y type, provides the voltage detection signal of A phase, B phase, C phase and the voltage source needed for control system respectively.A phase, B phase, C phase voltage are connected together by three grading resistors R20, R21, R22,1 pin of three terminal regulator U1 is exported to through bridge rectifier GQ2 filter capacitor C6, C1, output voltage, by three terminal regulator 3 pin direct current 5 volts of voltages through filter capacitor C2, C3 stable output, supplies the energization input of MCU control module.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (3)
1. an intelligent leakage circuit breaker, it is characterized in that: comprise the single-phase transformer A, single-phase transformer B and the single-phase transformer C that are connected to electric power system three-phase voltage input, single-phase transformer A, B, C form three phase mains transformer, the primary winding coils L1 of single-phase transformer A, B, C, L2, L3 are connected into Y type, the public termination the earth of Y type winding coil, other three ends are drawn respectively and are connected with three-phase voltage input, described single-phase transformer A, B, the secondary winding coil of C exports as double winding coil, first group of coil L11, L21, L31 is connected into y type, the common port connected control system ground of y type winding coil, other three ends of y type winding coil provide circuit breaker A phase respectively, B phase, C phase-voltage measurement signal and the voltage source needed for control system, single-phase transformer A, B, second group of coil L12 of the secondary output of C, L22, L32 composes in series zero sequential potential transformer by head and the tail, the opening two ends of zero sequential potential transformer connect the ac input end of rectifier bridge, the output of described rectifier bridge is connected with filter capacitor and dividing potential drop components and parts, described dividing potential drop components and parts are connected to the input input of MCU control module, described single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, C phase voltage output is connected in parallel to rectifier bridge successively, pressurizer and filter capacitor, described output end of voltage stabilizer connects the energization input of MCU control module.
2. intelligent leakage circuit breaker according to claim 1, it is characterized in that: the output of described rectifier bridge is connected in parallel to filter capacitor C5, filter capacitor C6, described filter capacitor C5, one end ground connection of filter capacitor C6, described filter capacitor C6 two ends are connected in parallel to the divider resistance R6 be connected in series, divider resistance R5, divider resistance R10, the described divider resistance R5 that is connected in series and divider resistance R10 two ends are connected in parallel to one or more divider resistance group, each divider resistance group is connected in series by two divider resistances, wherein the divider resistance two ends of ground connection are connected in parallel to voltage stabilizing didoe, the high voltage end of the divider resistance of each ground connection is all connected to the input input of MCU control module.
3. intelligent leakage circuit breaker according to claim 1 and 2, it is characterized in that: described single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, one end of C phase voltage is respectively by grading resistor R20, grading resistor R21, grading resistor R22 connects together and is connected to the first input end of bridge rectifier, single-phase transformer A, the A phase of single-phase transformer B and single-phase transformer C, B phase, the other end of C phase voltage connects together and is connected to the second input of bridge rectifier, described bridge rectifier output is connected in parallel to filter capacitor C6, filter capacitor C1, the two ends of filter capacitor C1 connect input pin and the ground of three terminal regulator U1 respectively, filter capacitor C2 is connected in parallel between the output of described three terminal regulator U1 and ground, filter capacitor C3, the output of described three terminal regulator U1 is connected with the energization input of described MCU control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420703125.6U CN204179639U (en) | 2014-11-20 | 2014-11-20 | Intelligent leakage circuit breaker |
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| CN201420703125.6U CN204179639U (en) | 2014-11-20 | 2014-11-20 | Intelligent leakage circuit breaker |
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| CN204179639U true CN204179639U (en) | 2015-02-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330687A (en) * | 2014-11-20 | 2015-02-04 | 浙江诚通电力科技有限公司 | Method and device for detecting electricity leakage fault of power supply system |
| CN105609283A (en) * | 2016-01-15 | 2016-05-25 | 胡妍 | Three-phase zero sequence current transformer |
| CN112630584A (en) * | 2020-11-02 | 2021-04-09 | 安徽安庆皖江发电有限责任公司 | Generator end abnormity monitoring system and method and electronic equipment |
-
2014
- 2014-11-20 CN CN201420703125.6U patent/CN204179639U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330687A (en) * | 2014-11-20 | 2015-02-04 | 浙江诚通电力科技有限公司 | Method and device for detecting electricity leakage fault of power supply system |
| CN105609283A (en) * | 2016-01-15 | 2016-05-25 | 胡妍 | Three-phase zero sequence current transformer |
| CN112630584A (en) * | 2020-11-02 | 2021-04-09 | 安徽安庆皖江发电有限责任公司 | Generator end abnormity monitoring system and method and electronic equipment |
| CN112630584B (en) * | 2020-11-02 | 2023-10-20 | 国能神皖安庆发电有限责任公司 | Generator terminal abnormality monitoring system and method and electronic equipment |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150225 Termination date: 20191120 |
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| CF01 | Termination of patent right due to non-payment of annual fee |