CN102411112B - Method and circuit for detecting secondary side wiring state of primary metering CT (Computed Tomography) outside terminal - Google Patents
Method and circuit for detecting secondary side wiring state of primary metering CT (Computed Tomography) outside terminal Download PDFInfo
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- CN102411112B CN102411112B CN 201110219559 CN201110219559A CN102411112B CN 102411112 B CN102411112 B CN 102411112B CN 201110219559 CN201110219559 CN 201110219559 CN 201110219559 A CN201110219559 A CN 201110219559A CN 102411112 B CN102411112 B CN 102411112B
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Abstract
The invention discloses a method and circuit for detecting a secondary side wiring state of a primary metering CT (Computed Tomography) outside a terminal. According to the invention, a test CT is arranged inside the terminal and a primary side of the test CT is connected with a secondary side of a tested CT; a secondary side of the test CT is connected with a self-excited oscillation circuit composed of a capacitor and an inverter; and a single chip computer arranged inside the terminal is used for measuring the frequency of an output waveform of the self-excited oscillation circuit to obtain open circuit or short circuit or partial short circuit or normal state information of a secondary side circuit of the tested CT. According to the method provided by the invention, the problem that the traditional detection technology cannot detect the partial short circuit condition of the secondary side part of the CT is solved, and the anti-electric-larceny level is effectively improved. The circuit is simple and reliable, low in price and convenient to manufacture.
Description
Technical field
The present invention relates to a kind of sense terminals outside and once measure the method and the circuit thereof of CT secondary side wiring state.
Background technology
At present, large-scale power user power utilization electric current both domestic and external reaches tens of to thousands of amperes.Generally be converted to the current supply electricity management terminal metering use of 5A or 1A by current transformer (once measuring CT).Some lawless persons come stealing by the mode that will once measure CT secondary circuit short-circuit or disconnection.The short-circuit condition of opening of once measuring the CT secondary side by terminal inner circuit supervision terminal outside prevents that stealing from having become important need.
Electric current or phase change that present existing technology can only once be measured the secondary side of the built-in CT that CT links to each other by test and outside are discerned the open circuit, short circuit of tested CT secondary side, are normally used electricity condition.And come the behavior of stealing not have effective detection means by will once measuring CT secondary side partial short circuit for some lawless persons.
Summary of the invention
The object of the present invention is to provide a kind of terminal inner circuit that can utilize once to measure the open circuit, short circuit, partial short circuit of CT secondary side, normal electricity consumption status detection method and circuit thereof in the identification terminal outside quickly and accurately.
Provided by the inventionly be used for the method that CT secondary side wiring state is once measured in the sense terminals outside, be that test CT is set in terminal, and the primary side that will test CT is connected with the secondary side of tested CT, connect electric capacity and phase inverter at the secondary side of test CT and form self-maintained circuit, utilize the frequecy characteristic of this self-maintained circuit output waveform of the built-in single chip computer measurement of terminal to obtain the open circuit of this tested CT secondary side circuit or short circuit or partial short circuit or status information normally.
The circuit that said method adopts, comprise test CT, self-maintained circuit, waveform shaping circuit, single chip circuit, wherein self-maintained circuit comprises the secondary side of testing CT, the input end of waveform shaping circuit is connected with self-maintained circuit, output terminal is connected with single-chip microcomputer, the output waveform of self-maintained circuit is carried out importing single-chip microcomputer after the shaping, single-chip microcomputer calculates the frequency of specified point, draws exterior of terminal according to the corresponding relation of frequency values and theoretical value and once measures the open circuit of CT secondary side circuit or short circuit or partial short circuit or status information normally.
The present invention utilizes the different principle of inductance value under CT secondary side open circuit, partial short circuit, all short circuits, the normal electricity consumption situation to obtain open circuit, short circuit, partial short circuit, normal four kinds of status informations of electricity consumption of this tested CT secondary side, solve the situation that can not detect CT secondary side partial short circuit in the detection technique in the past, improved anti-electricity-theft level effectively.And this circuit is simple, reliable, cheap, convenient to be produced.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a circuit structure diagram of the present invention.
Fig. 3 is a self-maintained circuit of the present invention.
Fig. 4 is a waveform shaping circuit of the present invention.
Fig. 5 is a single chip circuit of the present invention.
Fig. 6 is a software flow of the present invention.
Embodiment
The method that CT secondary side wiring state is once measured in sense terminals of the present invention outside is that test CT is set in terminal, and the primary side that will test CT is connected with the secondary side of tested CT, secondary side at test CT connects electric capacity and phase inverter composition self-maintained circuit, and the circuit that utilizes the frequecy characteristic of this self-maintained circuit output waveform of the built-in single chip computer measurement of terminal to obtain this tested CT secondary side is opened short-circuit condition information.The inventive method can detect four kinds and use electricity condition, i.e. open circuit, short circuit, partial short circuit, normal electricity consumption, and its principle is: CT is under open circuit, short circuit, partial short circuit, normal electricity consumption situation, and its inductance parameters can change thereupon.Utilize this characteristic, can judge the variation of tested CT inductance parameters by the waveform frequency feature that the self-maintained circuit that test is made up of test CT secondary side and electric capacity, phase inverter is exported, and then determine tested CT wiring state.
Tested CT secondary side open circuit, short circuit both of these case are with the difference of partial short circuit, normal electricity consumption both of these case: when tested CT secondary side open circuit or short circuit, the waveform that the self-maintained circuit of being made up of test CT secondary side and electric capacity, phase inverter is exported is the waveform of a frequency stabilization; And when tested CT secondary side partial short circuit or normal electricity consumption, the waveform that the self-maintained circuit of being made up of test CT secondary side and electric capacity, phase inverter is exported contains the power frequency composition.And the minimum frequency detection method can detect this tested CT secondary side is normal electricity consumption or partial short circuit.
So still short circuit is according to self-sustained oscillation output waveform frequency separation for tested CT secondary side open circuit, tested CT secondary side is that partial short circuit or normal electricity consumption are then distinguished according to the minimum frequency value of self-maintained circuit output waveform.
As shown in Figure 1, the present invention is that the test CT primary side that tested CT secondary side and terminal is built-in links to each other, and obtains the wiring state information of this tested CT secondary side circuit by the inductance of built-in circuit test test CT secondary side.
As shown in Figure 2, hardware circuit part of the present invention comprises self-maintained circuit, waveform shaping circuit, single chip circuit.Tested CT secondary side links with test CT primary side, and test CT secondary side and electric capacity, phase inverter are formed self-maintained circuit.The waveform of self-maintained circuit output is imported single-chip microcomputer through after the shaping.Single-chip microcomputer calculates the frequency of specified point, and the circuit that draws the Current Transformer Secondary side according to the corresponding relation of frequency values and theoretical value is opened short-circuit condition information.
As shown in Figure 3, self-maintained circuit of the present invention is made up of test CT secondary side, capacitor C 1, capacitor C 2, phase inverter D1.If tested CT secondary side equivalent inductance is L1, test CT primary side equivalent inductance is L2, and test CT secondary side equivalent inductance is L3, and test CT coefficient of mutual inductance is M, and test CT primary side and secondary side turn ratio are n.When resonance frequency big (more than the 1KHz), the reactance parameter of CT and mutual inductor is far longer than wire resistor.Therefore, in equivalent electrical circuit, can ignore coiling and line resistance.Can obtain Fig. 3 self-maintained circuit equivalent inductance thus is:
Circuit resonant frequencies:
When occurring that CT short circuit or open circuit etc. are any to cause the situation that inductance L changes, circuit resonant frequencies changes thereupon, judges tested CT secondary side wiring situation thus, below is two kinds of extreme cases.
During short circuit, L1=0, equivalent inductance
During open circuit, L1=
, equivalent inductance
For improving the reliability that detects, the design of test CT needs emphasis to consider following two aspects:
One. select magnetic permeability than higher core material.Magnetic permeability height, the inductance value of natural CT both sides also increase a lot, and be corresponding
Value just alters a great deal, so just than being easier to distinguish variation inductance;
Two. reduce the number of turn of secondary side.Though the primary side number of turn has tailed off, inductance value also diminishes, and also can make L
Open: L
NormallyValue become big, help distinguishing open circuit and subnormal frequency change.Through actual test, the number of turn of test CT secondary side is when 3 to 6 circles, and the test effect is best.
The means of stealing now are included in exterior of terminal and once measure the CT secondary side and shunt stealing, are exactly the so-called incomplete short circuit of electric current of going up, such as being short to 3A from the 5A shunting.This with power on directly that to flow to 3A be different because be shorted to 3A the impedance of primary side is changed, its equivalent inductance value diminishes.And the impedance of normally going up its primary side of 3A electric current is constant, thus electric current be near zero frequency can be than 3A on normal in the frequency of current zero-crossing point much bigger, just frequency at this moment is not the resonance frequency under the specific currents.
The foundation of minimum frequency detection algorithm is: under the situation of the influence of not considering magnetic hysteresis, the reflection of self-oscillatory minimum frequency be exactly electric current frequency when being zero.Therefore, this frequency has been eliminated the influence of electric current, and situation is the same during with CT loop no current, and this frequency can reflect the short-circuit state of opening of CT.
Because not exclusively short circuit is different with the impedance that direct upward electric current exterior of terminal in zero crossing once measures the CT secondary side, its equivalent inductance value is exactly different so, so the frequency values of zero crossing is exactly different, thereby know that its minimum frequency value also is different.Therefore, the minimum frequency detection method can detect this exterior of terminal once to measure the CT secondary side be normal electricity consumption or partial short circuit.
Tested CT secondary side open circuit, short circuit both of these case are with the difference of partial short circuit, normal electricity consumption both of these case: when tested CT secondary side open circuit or short circuit, the waveform that the self-maintained circuit of being made up of test CT secondary side and electric capacity, phase inverter is exported is the waveform of a frequency stabilization; And when tested CT secondary side partial short circuit or normal electricity consumption, the waveform that the self-maintained circuit of being made up of test CT secondary side and electric capacity, phase inverter is exported contains the power frequency composition.Therefore, whether containing the power frequency composition according to the self-sustained oscillation output waveform can distinguish.Still short circuit is according to self-sustained oscillation output waveform frequency separation for tested CT secondary side open circuit, and tested CT secondary side is that partial short circuit or normal electricity consumption are then distinguished according to the minimum frequency value of self-maintained circuit output waveform.
As shown in Figure 4, waveform shaping circuit is made up of capacitor C 5, resistance R 1, phase inverter D2, D3.The function of this circuit is that the sine wave that self-maintained circuit is exported is converted into square wave, makes things convenient for the single-chip microcomputer calculated rate.
As shown in Figure 5, single-chip microcomputer D4 external power supply and crystal oscillator, single-chip microcomputer are received from the waveform of excited oscillation circuit output by a common IO pin.
As shown in Figure 6, software judges that flow process is:
The first step, continuous coverage surpass each square wave frequency of the self-maintained circuit output of a power frequency period time span;
Second step, whether contain the power frequency composition by differentiating this waveform, the wiring of CT secondary side is divided into two kinds of situations: open circuit or short circuit, normal electricity consumption or partial short circuit;
The 3rd step, distinguish open circuit and short circuit by survey frequency, distinguish normal electricity consumption and partial short circuit by minimum frequency;
The 4th step is if test result conforms to certain wiring theoretic frequency value, then exports the result.If the result who records not in the theoretical value scope, then tests again.
The software flow of minimum frequency method part is when the rising edge of square wave arrives, to produce an interruption.First interruption enables timer and zero clearing register, each interrupt routine is finished following work afterwards: the counter register numerical value when opening up two word address space ADD1 and ADD2 and preserving nearest secondary successively and interrupt, suppose it is to interrupt for the N time at present, then should preserve the N-1 time with N-2 time counter register numerical value.The register value comparison of reading the N time interruption counter register numerical value and reading with the N-1 time interruption, as if the register value of interrupting reading greater than N-1 time, then use N-1 time counter register numerical value to cover N-2 counter register numerical value, cover N-1 time counter register numerical value with the N time interruption counter register numerical value, otherwise do not deal with.After experience was greater than a power frequency period, the numerical value that reads ADD1 was the minimum frequency value, was the frequency (this value usually very big) of circuit when not having resonance and preserve the ADD2 address.In order to make the method have stronger anti-interference, preferably remember 4 values near minimum frequency, calculate its mean value then.The frequency minima of being got, does not compare when frequency is lower than the open circuit frequency greater than the reference value of open circuit frequency, directly skips.
This technology is utilized the different principle of inductance value under CT secondary side open circuit, partial short circuit, all short circuits, the normal electricity consumption situation, the test CT primary side that tested CT secondary side and terminal is built-in links to each other, connect electric capacity and phase inverter composition self-maintained circuit for test CT secondary side, the frequency of utilizing built-in single-chip microcomputer to test this self-maintained circuit output waveform obtains the wiring state information of this tested CT secondary side.
The circuit part that this technology is used comprises test CT, self-maintained circuit, waveform shaping circuit, single chip circuit.Tested CT secondary side links with test CT primary side, and test CT secondary side and electric capacity, phase inverter are formed self-maintained circuit.The waveform of self-maintained circuit output is imported single-chip microcomputer through after the shaping.Single-chip microcomputer calculates the frequency of specified point, draws the wiring state information of this tested CT secondary side according to the corresponding relation of frequency values and theoretical value.
This technology solved in the detection technique in the past can not detection place CT secondary side partial short circuit situation.With CT secondary side open circuit, short circuit, normal three kinds of states of electricity consumption that can detect in the past, bring up to open circuit, short circuit, partial short circuit, normal four kinds of states of electricity consumption, improved anti-electricity-theft level effectively.And this circuit is simple, reliable, cheap, convenient to be produced.
Claims (4)
1. method that CT secondary side wiring state is once measured in the sense terminals outside, it is characterized in that installation testing CT in terminal, and the primary side that will test CT is connected with the secondary side of tested CT, secondary side at test CT connects electric capacity and phase inverter composition self-maintained circuit, utilize the frequecy characteristic of this self-maintained circuit output waveform of the built-in single chip computer measurement of terminal to obtain open circuit or short circuit or the partial short circuit or the normal status information of this tested CT secondary side circuit, specifically comprise the steps:
(1) terminal built-in testing CT primary side is once measured the CT secondary side with exterior of terminal and link to each other, test CT secondary side that terminal is built-in and electric capacity, phase inverter are formed self-maintained circuit;
(2) continuous coverage surpasses each square wave frequency of the self-maintained circuit output of a power frequency period time span;
(3) whether contain the power frequency composition by differentiating this waveform, the wiring of tested CT secondary side is divided into two kinds of situations: open circuit or short circuit, normal electricity consumption or partial short circuit;
(4) distinguish open circuit and short circuit by survey frequency, distinguish normal electricity consumption and partial short circuit by minimum frequency;
(5) test result conforms to certain wiring theoretic frequency value, then exports the result, and the result who records then tests not in the theoretical value scope again;
Described minimum frequency, it is the rising edge that comes each square wave of square wave of Acquisition Detection CT resonant circuit generation by described single-chip microcomputer, when the rising edge of square wave arrives, produce an interruption, first interruption enables timer and zero clearing register, each interrupt routine is finished following work afterwards: the counter register numerical value when opening up two word address space ADD1 and ADD2 and preserving nearest secondary successively and interrupt, suppose it is the N time interruption at present, then should preserve the counter register numerical value of the N-1 time and N-2 time, the register value comparison of reading the N time interruption counter register numerical value and reading with the N-1 time interruption, as if the register value of interrupting reading greater than N-1 time, then use N-1 time counter register numerical value to cover N-2 counter register numerical value, cover N-1 time counter register numerical value with the N time interruption counter register numerical value, otherwise do not deal with, after experience was greater than a power frequency period, the numerical value that reads ADD1 was the minimum frequency value.
2. circuit of adopting of method according to claim 1, it is characterized in that this circuit comprises test CT, self-maintained circuit, waveform shaping circuit, single chip circuit, wherein self-maintained circuit comprises the secondary side of testing CT, the input end of waveform shaping circuit is connected with self-maintained circuit, output terminal is connected with single-chip microcomputer, the output waveform of self-maintained circuit is carried out importing single-chip microcomputer after the shaping, single-chip microcomputer calculates the frequency of specified point, draws open circuit or short circuit or the partial short circuit or the normal status information of tested CT secondary side circuit according to the corresponding relation of frequency values and theoretical value.
3. circuit according to claim 2 is characterized in that described self-maintained circuit is made up of test CT secondary side, two electric capacity (C1, C2), phase inverter (D1).
4. according to claim 2 or 3 described circuit, it is characterized in that the core material of the core material selection high magnetic permeability of described test CT, the secondary side number of turn of test CT is not higher than 6 circles.
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| CN 201110219559 CN102411112B (en) | 2011-08-02 | 2011-08-02 | Method and circuit for detecting secondary side wiring state of primary metering CT (Computed Tomography) outside terminal |
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| CN 201110219559 CN102411112B (en) | 2011-08-02 | 2011-08-02 | Method and circuit for detecting secondary side wiring state of primary metering CT (Computed Tomography) outside terminal |
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| CN102411112A CN102411112A (en) | 2012-04-11 |
| CN102411112B true CN102411112B (en) | 2013-07-31 |
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| CN102967792B (en) * | 2012-11-19 | 2015-07-08 | 北京交通大学 | System and method for monitoring open-circuit faults of secondary circuit of current transformer in traction substation |
| CN104849649B (en) * | 2015-05-26 | 2019-03-22 | 中国电力科学研究院 | A kind of detection method of current transformer for metering secondary circuit state |
| CN106199306B (en) * | 2016-07-01 | 2021-04-23 | 中国电力科学研究院 | System and method for checking loop state monitoring device |
| CN107037303B (en) * | 2016-11-07 | 2019-06-07 | 北京博纳电气股份有限公司 | For being tested the detection device and method of CT secondary side circuit state outside ammeter |
| CN106443304B (en) * | 2016-11-07 | 2019-06-07 | 北京博纳电气股份有限公司 | For detecting the device and method of primary metering CT secondary side circuit state outside ammeter |
| CN108152784A (en) * | 2017-12-29 | 2018-06-12 | 江苏林洋能源股份有限公司 | A kind of circuit and method that external CT states are detected for mutual inductor access electric energy meter |
| CN109100603A (en) * | 2018-09-30 | 2018-12-28 | 中国电力科学研究院有限公司 | The detection device and method of secondary loop of mutual inductor short circuit |
| CN112285618A (en) * | 2019-12-20 | 2021-01-29 | 青岛鼎信通讯股份有限公司 | Scheme for detecting CT secondary side wiring state |
| CN112345995B (en) * | 2020-11-04 | 2022-12-13 | 国网山东省电力公司潍坊供电公司 | Voltage transformer calibration wiring device and use method |
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| CN2387647Y (en) * | 1999-08-20 | 2000-07-12 | 刘在能 | Device for preventing fraudulent use of electricity |
| CN2754103Y (en) * | 2004-04-19 | 2006-01-25 | 陈冬 | Illegal-use-proof electric-energy meter capable of monitoring CT state |
| CN201251596Y (en) * | 2008-06-25 | 2009-06-03 | 三门利达电器有限公司 | Anti-theft electric pulse type precise current transformer combination |
| CN202177678U (en) * | 2011-08-02 | 2012-03-28 | 长沙威胜信息技术有限公司 | Circuit for detecting terminal outside primary measurement captive test (CT) secondary side connection state |
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