CN105425067A - Method for testing residual current protection electric appliance - Google Patents
Method for testing residual current protection electric appliance Download PDFInfo
- Publication number
- CN105425067A CN105425067A CN201510800682.9A CN201510800682A CN105425067A CN 105425067 A CN105425067 A CN 105425067A CN 201510800682 A CN201510800682 A CN 201510800682A CN 105425067 A CN105425067 A CN 105425067A
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- mutual inductor
- internal resistance
- winding coil
- rct
- sampling resistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a method for testing a residual current protection electric appliance, comprising the following steps: a touch switch is switched on, a test instruction is issued, a microcontroller starts a signal conditioning circuit for detection after receiving the instruction, and tripping is output directly through a mechanical output mechanism if the leakage current is not zero and complies with a predetermined signal waveform in design; if the obtained real leakage current is zero or extremely low, the microcontroller activates a breakage detection circuit to detect the connection state of a single-winding coil of a transformer; when the single-winding coil is in a broken state, tripping is not output, and an LED lamp gives an alarm indication; and when the state is good, tripping is output directly through the mechanical output mechanism. According to the invention, the single-winding leakage current transformer is used as the input of detection, detection and protection of the protector can be self-checked without producing any analog excitation current in the whole process, and the test result can be indicated. A single winding is one winding less than double windings, the material consumption and technology complexity of the winding are reduced, the reliability is improved, and the cost is reduced.
Description
Technical field
The present invention relates to a kind of test method, particularly relate to a kind of test method of residual current protecting electrical equipment.
Background technology
GB GB-Z6829-2008, requires in " General Requirements of residual current protecting electrical equipment " 8.4: RCD should have a test unit, simulates and under rated voltage, passes to one to pick-up unit be no more than 2.5*I
Δthe residual current of n, so that the Motor ability of regular inspection residual current protecting electrical equipment.
If RCD has multiple I
Δn ratings, should only at minimum I
Δ2.5*I is verified under n setting valve
Δn value.
Note 1: time if necessary, technical committee can use and be greater than 2.5*I
Δthe value of n.
Note 2: test unit is used to check tripping function, instead of for evaluating the validity of the rated residual operating current function relevant with break.
As can be seen here, the major function of the test unit specified in GB is inspection tripping function.The method of current use is all use doublewound excitation winding to drive detect winding or produce exciting current with additive method, then drives testing circuit, the actuating circuit of protection circuit and dropout, realizes the object of test.The prerequisite of these methods flows through residual current protecting electrical equipment real residual current when being all and pressing test be zero or and small, once true residual current exists, because vector superposed reason, what may cause testing abnormally carries out.
Summary of the invention
One use simplex winding creepage mutual inductor in residual current operated protective device is the invention provides in order to overcome the above problems; also the test effect of the residual current protecting electrical equipment using double winding mutual inductor can be reached; and the cost overcoming doublewound mechanism existence is high; high withstand voltage; large volume, the test method of the residual current protecting electrical equipment of potential safety hazard.
For achieving the above object, the invention provides following technical scheme:
A test method for residual current protecting electrical equipment, is characterized in that: comprise the following steps:
The first step: connect touch-switch, microcontroller receives instruction, the corresponding actions that true leakage current makes is calculated according to signal conditioning circuit sampling, if leakage current is non-vanishing and meet design prearranged signal waveform, prove that the transformer induced output that residual current operated protective device is current and signal conditioning circuit are all normal, directly export trip action;
Second step: if the true leakage current that signal conditioning circuit obtains be zero or its value minimum, microcontroller activates break detection circuit, and according to voltage divider principle, calculate the internal resistance Rct of mutual inductor simplex winding coil, its formula is as follows:
Rct＝R2Vs/(Vref-Vs(1+R2/R1))
Wherein, R1 is sampling resistor, and R2 is divider resistance, and Vref is constant pressure source, and Vs is that dividing potential drop is sampled the voltage obtained;
3rd step: according to the internal resistance Rct of the mutual inductor simplex winding coil that second step calculates, and the mutual inductor internal resistance of actual design compares, judges whether to break;
When transformer disconnection, Vs=(R1/ (R1+R2)) * Vref, bring above formula into and obtain Rct infinity, the internal resistance Rct of the mutual inductor simplex winding coil namely calculated is greater than the mutual inductor internal resistance of actual design, then prove broken string, do not export trip action, make by LED instruction of reporting to the police accordingly;
And when mutual inductor does not break, Vs < (R1/ (R1+R2)) * Vref, bring above formula into obtain Rct and be less than 50 Ω, namely the internal resistance Rct of mutual inductor simplex winding coil equals the mutual inductor internal resistance of actual design, then represent and do not break, directly exported by mechanical output mechanism by microcontroller and thread off.
Described break detection circuit comprises sampling resistor R1, the internal resistance Rct of mutual inductor simplex winding coil, sampling resistor R1; Divider resistance R2 mono-termination constant pressure source Vref, another termination sampling resistor R1 one end, sampling resistor R1 other end welding system ground GND, between sampling resistor R1 and sampling resistor R1, connect dividing potential drop to sample the voltage Vs obtained, the internal resistance Rct mono-termination dividing potential drop of sensor simplex winding coil is sampled the voltage Vs obtained, another termination welding system ground GND.
Described mutual inductor is made up of magnetic core and mutual inductor simplex winding coil.
Beneficial effect: the present invention uses the leakage current transformer of simplex winding as the input detected, the omnidistance exciting current not producing any simulation, and self-inspection can be made to the detection of protector and protection, and the result of test can be indicated.A simplex winding winding fewer than double winding, decreases material consumption and the process complexity of winding, improves reliability, reduces cost.
The present invention adopt simplex winding button adopt touch-switch to experimental order signal to microcontroller, do not need directly to carry out analog current from alternate power taking, withstand voltage very low, thus need very little volume, while reducing cost, decrease handling safety hidden danger.
The present invention not only can detect the connection status of simplex winding, also can judge the duty of current detection unit simultaneously, more can judge the whether normal of trip action link, achieve inspection tripping function preferably.
The mutual inductor that the present invention adopts is primarily of magnetic core and simplex winding coil composition, and this mutual inductor can ensure the detection of residual current protecting electrical equipment and the normal operation of protection.
Accompanying drawing explanation
Fig. 1 is the pilot system block diagram of residual current protecting electrical equipment.
Fig. 2 is the test method logical flow chart of residual current protecting electrical equipment.
Fig. 3 is the break detection circuit figure of the pilot system of residual current protecting electrical equipment.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
As shown in Figure 1, the invention provides a kind of pilot system of residual current protecting electrical equipment, comprise touch-switch 6, microcontroller 5, enable circuits, break detection circuit 3, signal conditioning circuit 4, mutual inductor simplex winding coil 2, mechanical output mechanism 7, LED 8; Described mutual inductor is made up of magnetic core 1 and mutual inductor simplex winding coil 2; Touch-switch 6 is connected and is sent test dictation, after microcontroller 5 receives instruction, enabling signal modulate circuit 4 detects the corresponding actions obtaining true leakage current and make, if leakage current is non-vanishing and meet design prearranged signal waveform, prove that the transformer induced output that residual current operated protective device is current and signal conditioning circuit 4 are all normal, directly exported by mechanical output mechanism 7 and thread off; If the true leakage current obtained be zero or its value minimum, microcontroller 5 activates break detection circuit 3, goes to detect mutual inductor simplex winding coil 2 connection status; When mutual inductor simplex winding coil 2 state is for broken string, does not export dropout, and make by LED 8 instruction of reporting to the police accordingly; When mutual inductor simplex winding coil 2 is in good condition, is directly exported by mechanical output mechanism 7 and thread off.Enable circuits is metal-oxide-semiconductor on-off circuit, by microprocessor controls conducting, break detection circuit 3 is linked into microcontroller, to judge mutual inductor connection status.
As shown in Figure 3, described break detection circuit 3 comprises sampling resistor R1, the internal resistance Rct of mutual inductor simplex winding coil 2, sampling resistor R1; Divider resistance R2 mono-termination constant pressure source Vref, another termination sampling resistor R1 one end, sampling resistor R1 other end welding system ground GND, between sampling resistor R1 and sampling resistor R1, connect dividing potential drop to sample the voltage Vs obtained, the internal resistance Rct mono-termination dividing potential drop of sensor simplex winding coil 2 is sampled the voltage Vs obtained, another termination welding system ground GND.
As shown in Figure 2, a kind of test method of residual current protecting electrical equipment, comprises the following steps:
The first step: connect touch-switch 6, microcontroller 5 receives instruction, the corresponding actions that true leakage current makes is calculated according to signal conditioning circuit 4 sampling, if leakage current is non-vanishing and meet design prearranged signal waveform, prove that the transformer induced output that residual current operated protective device is current and signal conditioning circuit 4 are all normal, directly export trip action;
Second step: if the true leakage current that signal conditioning circuit 4 obtains be zero or its value minimum, microcontroller 5 activates break detection circuit 3, and according to voltage divider principle, calculate the internal resistance Rct of mutual inductor simplex winding coil 2, its formula is as follows:
Rct＝R2Vs/(Vref-Vs(1+R2/R1))
Wherein, R1 is sampling resistor, and R2 is divider resistance, and Vref is constant pressure source, and Vs is that dividing potential drop is sampled the voltage obtained;
3rd step: according to the internal resistance Rct of the mutual inductor simplex winding coil 2 that second step calculates, and the mutual inductor internal resistance of actual design compares, judges whether to break;
When transformer disconnection, Vs=(R1/ (R1+R2)) * Vref, bring above formula into and obtain Rct infinity, the internal resistance Rct of the mutual inductor simplex winding coil 2 namely calculated is greater than the mutual inductor internal resistance of actual design, then prove broken string, do not export trip action, make by LED 8 instruction of reporting to the police accordingly;
And when mutual inductor does not break, Vs < (R1/ (R1+R2)) * Vref, bring above formula into obtain Rct and be less than 50 Ω, namely the internal resistance Rct of mutual inductor simplex winding coil 2 equals the mutual inductor internal resistance of actual design, then represent and do not break, directly export dropout by mechanical output mechanism 7 by microcontroller 5.
The foregoing is only the preferred embodiments of the present invention, be not restricted to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (3)
1. a test method for residual current protecting electrical equipment, is characterized in that: comprise the following steps:
The first step: connect touch-switch (6), microcontroller (5) receives instruction, the corresponding actions that true leakage current makes is calculated according to signal conditioning circuit (4) sampling, if leakage current is non-vanishing and meet design prearranged signal waveform, prove that the transformer induced output that residual current operated protective device is current and signal conditioning circuit (4) are all normal, directly export trip action;
Second step: if the true leakage current that signal conditioning circuit (4) obtains be zero or its value minimum, microcontroller (5) activates break detection circuit (3), according to voltage divider principle, calculate the internal resistance Rct of mutual inductor simplex winding coil (2), its formula is as follows:
Rct＝R2Vs/(Vref-Vs(1+R2/R1))
Wherein, R1 is sampling resistor, and R2 is divider resistance, and Vref is constant pressure source, and Vs is that dividing potential drop is sampled the voltage obtained;
3rd step: according to the internal resistance Rct of the mutual inductor simplex winding coil (2) that second step calculates, and the mutual inductor internal resistance of actual design compares, judges whether to break;
When transformer disconnection, Vs=(R1/ (R1+R2)) * Vref, bring above formula into and obtain Rct infinity, the internal resistance Rct of the mutual inductor simplex winding coil (2) namely calculated is greater than the mutual inductor internal resistance of actual design, then prove broken string, do not export trip action, make by LED (8) instruction of reporting to the police;
And when mutual inductor does not break, Vs < (R1/ (R1+R2)) * Vref, bring above formula into obtain Rct and be less than 50 Ω, namely the internal resistance Rct of mutual inductor simplex winding coil (2) equals the mutual inductor internal resistance of actual design, then represent and do not break, directly exported by mechanical output mechanism (7) by microcontroller (5) and thread off.
2. the test method of a kind of residual current protecting electrical equipment according to claim 1, is characterized in that: described break detection circuit (3) comprises sampling resistor R1, the internal resistance Rct of mutual inductor simplex winding coil (2), sampling resistor R1; Divider resistance R2 mono-termination constant pressure source Vref, another termination sampling resistor R1 one end, sampling resistor R1 other end welding system ground GND, between sampling resistor R1 and sampling resistor R1, connect dividing potential drop to sample the voltage Vs obtained, the internal resistance Rct mono-termination dividing potential drop of sensor simplex winding coil (2) is sampled the voltage Vs obtained, another termination welding system ground GND.
3. the test method of a kind of residual current protecting electrical equipment according to claim 1, is characterized in that: described mutual inductor is made up of magnetic core (1) and mutual inductor simplex winding coil (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510800682.9A CN105425067A (en) | 2015-11-19 | 2015-11-19 | Method for testing residual current protection electric appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510800682.9A CN105425067A (en) | 2015-11-19 | 2015-11-19 | Method for testing residual current protection electric appliance |
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| CN105425067A true CN105425067A (en) | 2016-03-23 |
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| CN201510800682.9A Pending CN105425067A (en) | 2015-11-19 | 2015-11-19 | Method for testing residual current protection electric appliance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019062A (en) * | 2016-07-29 | 2016-10-12 | 江苏益邦电力科技有限公司 | Residual current coil disconnection detection device and detection method thereof |
| CN110658368A (en) * | 2019-09-24 | 2020-01-07 | 深圳供电局有限公司 | Residual current detection device and residual current action protection system |
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| CN104198794A (en) * | 2014-07-23 | 2014-12-10 | 浙江天正电气股份有限公司 | Zero sequence current transformer wire-break detection and residual current detection circuit |
| CN104297611A (en) * | 2014-01-14 | 2015-01-21 | 河南许继智能控制技术有限公司 | Transformer sampling circuit |
| CN204331971U (en) * | 2015-01-14 | 2015-05-13 | 安徽海圣电气有限公司 | A kind of can the electric fire monitoring device of monitoring current mutual inductor connection status |
| CN104793100A (en) * | 2015-05-13 | 2015-07-22 | 上海盛善电气有限公司 | Detection device for circuit breakage and short circuit of secondary coil of electric leakage mutual inductor |
-
2015
- 2015-11-19 CN CN201510800682.9A patent/CN105425067A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297611A (en) * | 2014-01-14 | 2015-01-21 | 河南许继智能控制技术有限公司 | Transformer sampling circuit |
| CN104198794A (en) * | 2014-07-23 | 2014-12-10 | 浙江天正电气股份有限公司 | Zero sequence current transformer wire-break detection and residual current detection circuit |
| CN204331971U (en) * | 2015-01-14 | 2015-05-13 | 安徽海圣电气有限公司 | A kind of can the electric fire monitoring device of monitoring current mutual inductor connection status |
| CN104793100A (en) * | 2015-05-13 | 2015-07-22 | 上海盛善电气有限公司 | Detection device for circuit breakage and short circuit of secondary coil of electric leakage mutual inductor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019062A (en) * | 2016-07-29 | 2016-10-12 | 江苏益邦电力科技有限公司 | Residual current coil disconnection detection device and detection method thereof |
| CN106019062B (en) * | 2016-07-29 | 2018-11-23 | 江苏益邦电力科技有限公司 | A kind of residual current coil breakage detection device and its detection method |
| CN110658368A (en) * | 2019-09-24 | 2020-01-07 | 深圳供电局有限公司 | Residual current detection device and residual current action protection system |
| CN110658368B (en) * | 2019-09-24 | 2022-09-02 | 深圳供电局有限公司 | Residual current detection device and residual current action protection system |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20170911 Address after: Xinba Daquan 212200 Yangzhong Road, Zhenjiang City, Jiangsu province 66 Applicant after: Jiangsu Daquan Kai Kai switch Co., Ltd. Address before: 211106 Jiangning economic and Technological Development Zone, Jiangsu, Hidden Dragon Road, No. 28, No. Applicant before: NANJING DAQO ELECTRIC INSTITUTE CO., LTD. |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160323 |