CN109100603A - The detection device and method of secondary loop of mutual inductor short circuit - Google Patents
The detection device and method of secondary loop of mutual inductor short circuit Download PDFInfo
- Publication number
- CN109100603A CN109100603A CN201811157434.7A CN201811157434A CN109100603A CN 109100603 A CN109100603 A CN 109100603A CN 201811157434 A CN201811157434 A CN 201811157434A CN 109100603 A CN109100603 A CN 109100603A
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- mutual inductor
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- impedance
- secondary loop
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to the detection devices and method of a kind of secondary loop of mutual inductor short circuit, including secondary circuit state recognition unit, high frequency electrocardiography unit, current signal detection unit, first coil and sampling resistor, wherein the secondary circuit state recognition unit is connected with the high frequency electrocardiography unit, the high frequency electrocardiography unit is connected by the sampling resistor with the first coil, the sampling resistor is connected by the current signal detection unit with the secondary circuit state recognition unit, the secondary circuit state recognition unit calculates the impedance of secondary circuit, by the way that the impedance is made comparisons judge whether secondary loop of mutual inductor is short-circuit with threshold value.The present invention is not only simple, and measuring accuracy is high.
Description
Technical field
The present invention relates to the technical fields of impedance loop detection, refer in particular to a kind of short circuit of secondary loop of mutual inductor
Detection device and method.
Background technique
Metering current mulual inductor secondary circuit failure and stealing state common are the second open circuit, secondary of current transformer
Short circuit, primary bypass, secondary concatenation semiconductor etc., in these failures and stealing state and with Current Transformer Secondary short circuit the most
It is common.Common detection method is to concatenate 2 high-frequency cores in metering secondary single-turn cored structure, if 2 high-frequency cores are around upper
Dry circle first injects a high-frequency signal by a high-frequency core, then return signal is detected in another high-frequency core, by infusing
The return signal of the high-frequency signal and detection that enter calculates the high frequency equivalent impedance of metering secondary, judges further according to impedance
The state of secondary circuit.Due to the signal very little that high-frequency detection iron core is coupled to, needs to concatenate biggish sampling resistor and adopted
Sample, therefore be easy to be saturated when having power current, to influence the calculating of metering secondary high frequency equivalent impedance, lead
It is not high to send a telegraph current transformer secondary loop short circuit state recognition rate, and is easy to appear wrong report.
In order to overcome the above problem, Chinese invention patent (CN106645931A) discloses a kind of Current Transformer Secondary time
Road monitoring modular and method, special transformer acquisition terminal, the monitoring modular includes: the first communication unit, in special transformer acquisition terminal
The second communication unit communicated；Current detecting unit detects the load current of secondary loop of mutual inductor；Signal applies
Unit injects high-frequency voltage signal to secondary loop of mutual inductor；Resonant element injects high in secondary loop of mutual inductor
Resonance occurs when frequency voltage signal；Phase inverter constitutes self-maintained circuit with resonant element；Micro-control unit realizes that data are adopted
Collection, Row control and signal control.Although the above-mentioned normal connection that secondary loop of mutual inductor may be implemented opens a way, is short
Road and the status monitoring for being shorted electric energy meter, but entire test method is complicated, and accuracy is low.
Summary of the invention
For this purpose, technical problem to be solved by the present invention lies in overcome test method complexity, and accuracy in the prior art
Low problem, to provide, a kind of method is simple, and improves the detection dress of the secondary loop of mutual inductor short circuit of measurement accuracy
It sets and method.
In order to solve the above technical problems, a kind of detection device of secondary loop of mutual inductor short circuit of the invention, including
Secondary circuit state recognition unit, high frequency electrocardiography unit, current signal detection unit, first coil and sampling resistor,
Described in secondary circuit state recognition unit be connected with the high frequency electrocardiography unit, the high frequency electrocardiography unit passes through
The sampling resistor is connected with the first coil, the sampling resistor by the current signal detection unit with it is described secondary
Loop state recognition unit is connected, and the secondary circuit state recognition unit calculates the impedance of secondary circuit, by by the resistance
It is anti-to make comparisons judge whether secondary loop of mutual inductor is short-circuit with threshold value.
In one embodiment of the invention, when the impedance is made comparisons with threshold value, if the impedance is less than or equal to described
Threshold value, then it is assumed that output current transformer secondary loop short circuit, if the impedance is greater than the threshold value, then it is assumed that output electric current is mutual
Sensor secondary circuit is normal.
In one embodiment of the invention, the threshold value is the calibration value of experience.
It in one embodiment of the invention, further include secondary loop of mutual inductor, and the Current Transformer Secondary
Circuit is connected with the first coil.
In one embodiment of the invention, the secondary loop of mutual inductor passes through the second coil and electricity consumption side phase
Even.
The present invention also provides a kind of detection methods of secondary loop of mutual inductor short circuit, utilize above-mentioned any one institute
Whether the detection arrangement monitors secondary loop of mutual inductor for the secondary loop of mutual inductor short circuit stated occurs short circuit, including such as
Lower step: the high-frequency voltage signal that secondary circuit state recognition unit generates is applied in first coil；Sensed current signal,
And the numerical value that will test passes to the secondary circuit state recognition unit, passes through the secondary circuit state recognition unit meter
Calculate the impedance of secondary circuit；The impedance is made comparisons judge whether secondary loop of mutual inductor is short-circuit with threshold value.
In one embodiment of the invention, judge secondary loop of mutual inductor whether Duan Lu method are as follows: if described
Impedance is less than or equal to the threshold value, then it is assumed that output current transformer secondary loop short circuit, if the impedance is greater than the threshold value,
Then think output current transformer secondary circuit normally the threshold value be experience calibration value.
In one embodiment of the invention, the impedance of secondary circuit is calculated by the secondary circuit state recognition unit
Method are as follows:WhereinFor High frequency injection signals, n0For the number of turns of first coil,For injection
The electric current that voltage generates,Injecting voltage when opening a way for metering secondaryThe electric current of generation.
The above technical solution of the present invention has the following advantages over the prior art:
The detection device and method of secondary loop of mutual inductor short circuit of the present invention, the high frequency electrocardiography list
Member is connected by the sampling resistor with the first coil, to high-frequency voltage signal is added in the first coil, institute
It states sampling resistor and is connected by the current signal detection unit with the secondary circuit state recognition unit, the current signal
Detection unit detects the current signal by generating when the first coil, and the numerical value detected is passed to the secondary returning
Line state recognition unit, the secondary circuit state recognition unit calculate the impedance of secondary circuit, by by the impedance and threshold
Value, which is made comparisons, judges whether secondary loop of mutual inductor is short-circuit, so as to accurately identify that secondary loop of mutual inductor has
Secondary loop short circuit state when power current, the present invention is not only simple, and accuracy is high, effective solution metering secondary returning
There is when power current the problem of identification of secondary loop of mutual inductor short-circuit condition is influenced because of high-frequency detection core sataration on road.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the schematic diagram of the detection device of secondary loop of mutual inductor short circuit of the present invention.
Figure of description explanation: 11- secondary circuit state recognition unit, 12- high frequency electrocardiography unit, 13- electric current letter
Number detection unit, 14- first coil, 15- sampling resistor, 16- secondary loop of mutual inductor, the second coil of 17-, 18- electricity consumption
It surveys.
Specific embodiment
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of detection device of secondary loop of mutual inductor short circuit, including secondary returning
Line state recognition unit 11, high frequency electrocardiography unit 12, current signal detection unit 13, first coil 14 and sampling resistor
15, wherein the secondary circuit state recognition unit 11 is connected with the high frequency electrocardiography unit 12, the high-frequency signal note
Enter unit 12 and be connected by the sampling resistor 15 with the first coil 14, the sampling resistor 15 passes through the current signal
Detection unit 13 is connected with the secondary circuit state recognition unit 11, and the secondary circuit state recognition unit 11 calculates secondary
The impedance in circuit, by the way that the impedance is made comparisons judge whether secondary loop of mutual inductor is short-circuit with threshold value.
The detection device of the short circuit of secondary loop of mutual inductor described in the present embodiment, including secondary circuit state recognition unit
11, high frequency electrocardiography unit 12, current signal detection unit 13, first coil 14 and sampling resistor 15, wherein described secondary
Loop state recognition unit 11 is connected with the high frequency electrocardiography unit 12, and the secondary circuit state recognition unit 11 generates
Frequency is the high-frequency voltage signal of fThe high-frequency voltage signalIt is transmitted in the high frequency electrocardiography unit 12, institute
It states high frequency electrocardiography unit 12 and is connected by the sampling resistor 15 with the first coil 14, thus by high-frequency voltage signalIt is added in the first coil 14, the sampling resistor 15 passes through the current signal detection unit 13 and the secondary circuit
State recognition unit 11 is connected, and the detection of current signal detection unit 13 is believed by the electric current generated when the first coil 14
NumberAnd the numerical value detected is passed to the secondary circuit state recognition unit 11, the secondary circuit state recognition list
Member 11 calculates the impedance of secondary circuit, by the way that the impedance is made comparisons judge whether secondary loop of mutual inductor is short with threshold value
Road, secondary loop short circuit state when so as to accurately identify that secondary loop of mutual inductor has power current, the present invention is not
But it is simple, and accuracy is high, when effective solution metering secondary has power current due to high-frequency detection core sataration
The problem of influencing the identification of secondary loop of mutual inductor short-circuit condition.
When the impedance is made comparisons with threshold value, if the impedance is less than or equal to the threshold value, then it is assumed that output Current Mutual Inductance
Device secondary loop short circuit, if the impedance is greater than the threshold value, then it is assumed that output current transformer secondary circuit is normal, effectively
Solving metering secondary and having when power current influences secondary loop of mutual inductor short circuit because of high-frequency detection core sataration
The problem of state recognition.Wherein the threshold value is the calibration value of experience.
It further include secondary loop of mutual inductor 16, and the secondary loop of mutual inductor 16 and the first coil 14
It is connected, to realize the connection of measuring device Yu the secondary loop of mutual inductor 16.The secondary loop of mutual inductor
16 are connected by the second coil 17 with electricity consumption side 18, to facilitate deciding on the purposes such as whether faulty, aging, stealing.
In the present embodiment, the first coil 14 and second coil 17 are high-frequency cores, and the first coil
14 be high-frequency signal coupling channel.
Embodiment two
The present embodiment provides a kind of detection methods of secondary loop of mutual inductor short circuit, utilize electricity described in embodiment one
Whether the detection arrangement monitors secondary loop of mutual inductor of current transformer secondary loop short circuit occurs short circuit, including walks as follows
It is rapid: step S1: the high-frequency voltage signal that secondary circuit state recognition unit 11 generates being applied in first coil 14；Step
S2: sensed current signal, and the numerical value that will test passes to the secondary circuit state recognition unit 11, by described secondary
The impedance of the calculating secondary circuit of loop state recognition unit 11；Step S3: the impedance is made comparisons with threshold value and judges that electric current is mutual
Whether sensor secondary circuit is short-circuit.
The detection method of the short circuit of secondary loop of mutual inductor described in the present embodiment, in the step S1, by secondary circuit
The high-frequency voltage signal that state recognition unit 11 generates is applied in first coil 14, is conducive to sensed current signal；The step
In rapid S2, sensed current signal, and the numerical value that will test passes to the secondary circuit state recognition unit 11, by described
The impedance of the calculating secondary circuit of secondary circuit state recognition unit 11；In the step S3, the impedance is made comparisons with threshold value
Judge whether secondary loop of mutual inductor is short-circuit, so as to accurately identify that secondary loop of mutual inductor has power current
When secondary loop short circuit state, the present invention is not only simple, and accuracy is high, and effective solution metering secondary has power frequency
The problem of secondary loop of mutual inductor short-circuit condition identification is influenced when electric current because of high-frequency detection core sataration.
Judge secondary loop of mutual inductor whether Duan Lu method are as follows: if the impedance be less than or equal to the threshold value,
Output current transformer secondary loop short circuit is thought, if the impedance is greater than the threshold value, then it is assumed that output current transformer two
Minor loop normally the threshold value be experience calibration value.Wherein the threshold value is the calibration value of experience.
The method of the impedance of secondary circuit is calculated by the secondary circuit state recognition unit are as follows: if first coil 14
The number of turns is n0, the sampling resistor 15 is R0, Z1It (f) is the high frequency equivalent impedance of first coil 14.For High frequency injection signals,Injecting voltage when opening a way for metering secondaryThe electric current of generation, then impedance are For injecting voltageThe electric current of generation,For the voltage at 14 both ends of first coil, have It is secondary to be injected into metering
The voltage in circuit,ForThe electric current of output, hasInfusion circuit total impedanceHaveThe then impedance of metering secondary
Obviously, the above embodiments are merely examples for clarifying the description, does not limit the embodiments.For
For those of ordinary skill in the art, other different form variations can also be made on the basis of the above description or are become
It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.And obvious variation extended from this or change
It moves still within the protection scope of the invention.
Claims (9)
1. a kind of detection device of secondary loop of mutual inductor short circuit, it is characterised in that: including secondary circuit state recognition list
Member, high frequency electrocardiography unit, current signal detection unit, first coil and sampling resistor, wherein the secondary circuit state
Recognition unit is connected with the high frequency electrocardiography unit, the high frequency electrocardiography unit by the sampling resistor with it is described
First coil is connected, and the sampling resistor passes through the current signal detection unit and the secondary circuit state recognition unit phase
Even, the secondary circuit state recognition unit calculates the impedance of secondary circuit, by the way that the impedance is made comparisons judgement with threshold value
Whether secondary loop of mutual inductor is short-circuit.
2. the detection device of secondary loop of mutual inductor short circuit according to claim 1, it is characterised in that: the impedance with
When threshold value is made comparisons, if the impedance is less than or equal to the threshold value, then it is assumed that output current transformer secondary loop short circuit, if institute
Impedance is stated greater than the threshold value, then it is assumed that output current transformer secondary circuit is normal.
3. the detection device of secondary loop of mutual inductor short circuit according to claim 1, it is characterised in that: the threshold value is
The calibration value of experience.
4. the detection device of secondary loop of mutual inductor short circuit according to claim 1, it is characterised in that: further include electric current
Transformer secondary circuit, and the secondary loop of mutual inductor is connected with the first coil.
5. the detection device of secondary loop of mutual inductor short circuit according to claim 4, it is characterised in that: the electric current is mutual
Sensor secondary circuit is connected by the second coil with electricity consumption side.
6. a kind of detection method of secondary loop of mutual inductor short circuit, utilizes electricity described in any one of claim 1-5
Whether the detection arrangement monitors secondary loop of mutual inductor of current transformer secondary loop short circuit occurs short circuit, which is characterized in that
Include the following steps:
Step S1: the high-frequency voltage signal that secondary circuit state recognition unit generates is applied in first coil；
Step S2: sensed current signal, and the numerical value that will test passes to the secondary circuit state recognition unit, passes through institute
State the impedance that secondary circuit state recognition unit calculates secondary circuit；
Step S3: the impedance is made comparisons judge whether secondary loop of mutual inductor is short-circuit with threshold value.
7. the detection method of secondary loop of mutual inductor short circuit according to claim 6, it is characterised in that: judge that electric current is mutual
Sensor secondary circuit whether Duan Lu method are as follows: if the impedance be less than or equal to the threshold value, then it is assumed that output current transformer
Secondary loop short circuit, if the impedance is greater than the threshold value, then it is assumed that the normal threshold value of output current transformer secondary circuit
It is the calibration value of experience.
8. the detection method of the short circuit of secondary loop of mutual inductor described according to claim 6 or 7, it is characterised in that: the threshold
Value is the calibration value of experience.
9. the detection method of secondary loop of mutual inductor short circuit according to claim 6, it is characterised in that: pass through described two
The method that minor loop state recognition unit calculates the impedance of secondary circuit are as follows:WhereinFor high frequency
Injection Signal, n0For the number of turns of first coil,For injecting voltage generate electric current,To be injected when metering secondary open circuit
VoltageThe electric current of generation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811157434.7A CN109100603A (en) | 2018-09-30 | 2018-09-30 | The detection device and method of secondary loop of mutual inductor short circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811157434.7A CN109100603A (en) | 2018-09-30 | 2018-09-30 | The detection device and method of secondary loop of mutual inductor short circuit |
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Cited By (8)
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| CN110736916A (en) * | 2019-10-29 | 2020-01-31 | 宁波三星医疗电气股份有限公司 | State recognition method and device, electronic equipment and computer readable storage medium |
| CN110850334A (en) * | 2019-11-28 | 2020-02-28 | 国网福建省电力有限公司龙岩供电公司 | Nondestructive testing method and device for CT secondary circuit state |
| CN111505533A (en) * | 2020-05-06 | 2020-08-07 | 南京四联共创电气工程有限公司 | Ground wire test terminal and system and ground wire test method under uninterrupted power supply working condition |
| CN112415460A (en) * | 2020-09-07 | 2021-02-26 | 青岛鼎信通讯股份有限公司 | Current transformer fault self-diagnosis system and method |
| CN113504501A (en) * | 2021-09-13 | 2021-10-15 | 中国电力科学研究院有限公司 | Online error monitoring system and method for current transformer |
| CN113848381A (en) * | 2021-09-23 | 2021-12-28 | 石家庄科林电气股份有限公司 | Device and method for judging current bypass event |
| CN116087866A (en) * | 2023-04-11 | 2023-05-09 | 山东泰开互感器有限公司 | Short-circuit resistance test system and method for secondary grounding system of current transformer |
| CN118376959A (en) * | 2024-06-21 | 2024-07-23 | 东方电子股份有限公司 | Current transformer secondary connecting wire monitoring system and method for lightning arrester monitoring |
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| CN110850334B (en) * | 2019-11-28 | 2022-03-29 | 国网福建省电力有限公司龙岩供电公司 | Nondestructive testing method and device for CT secondary circuit state |
| CN111505533A (en) * | 2020-05-06 | 2020-08-07 | 南京四联共创电气工程有限公司 | Ground wire test terminal and system and ground wire test method under uninterrupted power supply working condition |
| CN112415460A (en) * | 2020-09-07 | 2021-02-26 | 青岛鼎信通讯股份有限公司 | Current transformer fault self-diagnosis system and method |
| CN113504501A (en) * | 2021-09-13 | 2021-10-15 | 中国电力科学研究院有限公司 | Online error monitoring system and method for current transformer |
| CN113848381A (en) * | 2021-09-23 | 2021-12-28 | 石家庄科林电气股份有限公司 | Device and method for judging current bypass event |
| CN116087866A (en) * | 2023-04-11 | 2023-05-09 | 山东泰开互感器有限公司 | Short-circuit resistance test system and method for secondary grounding system of current transformer |
| CN118376959A (en) * | 2024-06-21 | 2024-07-23 | 东方电子股份有限公司 | Current transformer secondary connecting wire monitoring system and method for lightning arrester monitoring |
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