CN110927623A - Power equipment electric leakage detection system - Google Patents
Power equipment electric leakage detection system Download PDFInfo
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- CN110927623A CN110927623A CN201911241463.6A CN201911241463A CN110927623A CN 110927623 A CN110927623 A CN 110927623A CN 201911241463 A CN201911241463 A CN 201911241463A CN 110927623 A CN110927623 A CN 110927623A
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- residual current
- current transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides an electric leakage detection system of electric power equipment, which comprises a residual current transformer, a self-checking current generation unit, a signal conditioning unit, a control processing unit, an alarm unit, a display unit, a communication unit, a switch and a relay, wherein the residual current transformer is connected with the control processing unit; the electric leakage detection system analyzes and judges whether an electric leakage fault occurs according to the signals collected by the residual current transformer through the control processing unit, timely sends out an alarm when the electric leakage fault occurs, and can periodically perform abnormity self-detection on the electric leakage detection system. The invention provides a power equipment electric leakage detection system which can improve the accuracy of electric leakage detection and better ensure the safety and reliability of power equipment.
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to an electric power equipment electric leakage detection system.
Background
With the increasing production and living standards, the electrical safety is more and more emphasized by the countries and the society, and the leakage protector becomes an important device for detecting the leakage of the electrical equipment.
The residual current transformer is an important component of the leakage protector, and when the residual current transformer is in a complex and severe working environment for a long time, such as temperature, humidity and salinity drastic changes, the residual current transformer is influenced by electromagnetic interference, dirt, vibration and the like, or various faults are easily caused due to manufacturing processes, the service life of materials, corrosion and aging and the like.
When the residual current transformer has faults, the information quantity is small, the detection method is limited, and fault diagnosis is difficult, but tiny faults easily cause deviation of output values, so that misoperation and action rejection of the protector are caused. In order to ensure the safe operation of the intelligent residual current protector and improve the operation reliability of the intelligent residual current protector, the state of the residual current transformer needs to be periodically self-diagnosed.
The invention provides an electric leakage detection system for electric equipment, which can not only accurately detect whether the electric equipment has an electric leakage fault, but also regularly self-check the residual current transformer and the relay, and can effectively meet the requirement of electric leakage protection.
Disclosure of Invention
The invention provides a power equipment electric leakage detection system which can improve the accuracy of electric leakage detection and better ensure the safety and reliability of power equipment.
The invention specifically relates to an electric leakage detection system of power equipment, which comprises a residual current transformer, a self-checking current generation unit, a signal conditioning unit, a control processing unit, an alarm unit, a display unit, a communication unit, a switch and a relay, wherein the residual current transformer is respectively connected with the self-checking current generation unit and the signal conditioning unit; the electric leakage detection system analyzes and judges whether an electric leakage fault occurs according to the signals collected by the residual current transformer through the control processing unit, timely sends out an alarm when the electric leakage fault occurs, and can periodically perform abnormity self-detection on the electric leakage detection system.
The residual current transformer comprises an iron core, a secondary winding and a detection winding, and a phase line and an N line penetrate through the iron core during installation; the secondary winding is an output winding for normal work of the residual current transformer; and the detection winding is matched with the self-detection current generation unit to input detection current to the residual current transformer, so that whether the residual current transformer works normally is judged.
The signal conditioning unit comprises an amplifying module, a filtering module and an A/D conversion module, wherein the filtering module filters high-frequency interference signals by adopting a low-pass filter.
The relay comprises a first contact and a second contact, the first contact is closed to control the switch to be closed, the power equipment is connected with a power supply, and the second contact is connected with the first contact in parallel.
The control processing unit adopts a single chip microcomputer to carry out information processing and integral control on the electric leakage detection system, and mainly comprises three working modes:
and (3) a normal working mode: the first contact is closed, the second contact is opened, the leakage signal acquired by the residual current transformer is compared with the leakage signal reference value, if the leakage signal reference value is larger than the leakage signal reference value, the alarm unit is controlled to send an alarm signal, and the alarm information is uploaded to the monitoring center through the communication unit;
sensor inspection mode: the control processing system analyzes and compares the induced voltage signals, judges whether the residual current transformer works normally or not, controls the alarm unit to give an alarm if the residual current transformer works abnormally, displays the abnormality of the sensor by the display unit, and uploads the abnormal information of the residual current transformer to the monitoring center through the communication unit;
a relay checking mode: controlling the second contact to be closed, controlling the self-checking current generating unit to generate a self-checking residual current signal, transmitting the self-checking residual current signal to the detection winding, generating a corresponding induced voltage signal by the secondary winding, monitoring whether the first contact is disconnected, and if the first contact is disconnected, the relay works normally, controlling the first contact to be closed, and disconnecting the second contact; if the relay is not disconnected, the relay is in fault, the alarm unit is controlled to give an alarm, the display unit displays the abnormality of the relay, and the abnormal information of the relay is uploaded to the monitoring center through the communication unit;
and the control processing unit sets a checking period and performs periodic self-checking work on the residual current transformer and the relay respectively.
Compared with the prior art, the beneficial effects are: electric leakage detection system can not only accurately detect out whether electric leakage trouble takes place for power equipment, can also be regular right residual current transformer the relay carries out self-checking, guarantees electric leakage detection system's operational reliability and accuracy, and then ensures power equipment's safe, reliable work.
Drawings
Fig. 1 is a schematic structural diagram of an electrical leakage detection system of an electrical device according to the present invention.
Detailed Description
The following describes a specific embodiment of the electrical leakage detection system of the electrical equipment in detail with reference to the accompanying drawings.
As shown in fig. 1, the electric leakage detection system of the present invention includes a residual current transformer, a self-checking current generation unit, a signal conditioning unit, a control processing unit, an alarm unit, a display unit, a communication unit, a switch, and a relay, wherein the residual current transformer is connected to the self-checking current generation unit and the signal conditioning unit, the control processing unit is connected to the self-checking current generation unit, the signal conditioning unit, the alarm unit, the display unit, the communication unit, the switch, and the relay, and contacts of the relay are connected in series to a switch control loop; the relay comprises a first contact and a second contact, the first contact is closed to control the switch to be closed, the power equipment is connected with the power supply, the second contact is connected with the first contact in parallel, and the second contact is in a normally open state; the switch controls the power supply condition of the power equipment.
The residual current transformer comprises an iron core, a secondary winding and a detection winding, a phase line and an N line penetrate through the iron core during installation, the secondary winding is used for outputting the winding when the residual current transformer normally works, the detection winding is matched, and a self-detection current generation unit inputs detection current to the residual current transformer.
The signal conditioning unit comprises an amplifying module, a filtering module and an A/D conversion module, wherein the filtering module filters high-frequency interference signals by adopting a low-pass filter.
The control processing unit adopts the singlechip to carry out information processing and integral control on the electric leakage detection system, sets a check period and respectively controls the electric leakage detection system to carry out periodic self-checking work on the residual current transformer and the relay.
The leakage detection system mainly comprises three working modes:
and (3) a normal working mode: the first contact is closed, the second contact is opened, the leakage signal collected by the residual current transformer is processed by the signal conditioning unit and is transmitted to the control processing unit to compare the leakage signal collected by the residual current transformer with the reference value of the leakage signal, if the leakage signal is greater than the reference value of the leakage signal, the alarm unit is controlled to send an alarm signal, and the alarm information is uploaded to the monitoring center through the communication unit; if the current is not greater than the leakage signal reference value, continuing to detect;
sensor inspection mode: the first contact is closed, the second contact is opened, the control processing unit controls the self-checking current generating unit to generate a self-checking residual current signal, the self-checking residual current signal is transmitted to the detection winding, the secondary winding generates a corresponding induced voltage signal, the leakage signal is processed by the signal conditioning unit and is transmitted to the control processing unit to control the processing system to analyze and compare the induced voltage signal, whether the residual current transformer works normally is judged, if the residual current transformer works abnormally, the control alarm unit sends out an alarm, the display unit displays that the sensor is abnormal, and abnormal information of the residual current transformer is uploaded to the monitoring center through the communication unit;
a relay checking mode: firstly, the second contact is controlled to be closed, the self-checking current generating unit is controlled to generate a self-checking residual current signal, the self-checking residual current signal is transmitted to the detection winding, the secondary winding generates a corresponding induced voltage signal, the leakage signal is processed by the signal conditioning unit and is transmitted to the control processing unit control processing system, the first contact is controlled to be opened, whether the first contact is opened or not is monitored, if the first contact is opened, the relay works normally, the first contact is controlled to be closed, and the second contact is opened; if the relay is not disconnected, the relay is in fault, the alarm unit is controlled to give an alarm, the display unit displays the abnormality of the relay, and the abnormal information of the relay is uploaded to the monitoring center through the communication unit.
In the relay check mode, the second contact is closed firstly, and if the first contact acts normally in the detection process, normal power supply of the power equipment can be guaranteed while relay check is carried out.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The electric leakage detection system of the power equipment is characterized by comprising a residual current transformer, a self-checking current generation unit, a signal conditioning unit, a control processing unit, an alarm unit, a display unit, a communication unit, a switch and a relay, wherein the residual current transformer is respectively connected with the self-checking current generation unit and the signal conditioning unit, the control processing unit is respectively connected with the self-checking current generation unit, the signal conditioning unit, the alarm unit, the display unit, the communication unit, the switch and the relay, and a relay contact is connected in series with a switch control loop; the electric leakage detection system analyzes and judges whether an electric leakage fault occurs according to the electric leakage signal collected by the residual current transformer through the control processing unit, timely sends out an alarm when the electric leakage fault occurs, and can periodically perform abnormity self-detection on the electric leakage detection system.
2. The electrical equipment leakage detection system of claim 1, wherein the residual current transformer comprises an iron core, a secondary winding and a detection winding, and the phase line and the N line pass through the iron core when the residual current transformer is installed; the secondary winding is an output winding for normal work of the residual current transformer; and the detection winding is matched with the self-detection current generation unit to input detection current to the residual current transformer, so that whether the residual current transformer works normally is judged.
3. The electrical equipment leakage detection system of claim 2, wherein the signal conditioning unit comprises an amplifying module, a filtering module and an a/D conversion module, and the filtering module employs a low-pass filter to filter out high-frequency interference signals.
4. An electrical leakage detection system for electrical equipment according to claim 3, wherein said relay comprises a first contact and a second contact, said first contact closing controlling said switch closing, said electrical equipment being powered on, said second contact being connected in parallel with said first contact.
5. The electrical equipment leakage detection system of claim 4, wherein the control processing unit uses a single chip to perform information processing and overall control on the electrical equipment leakage detection system, and mainly comprises three operation modes:
and (3) a normal working mode: the first contact is closed, the second contact is opened, the leakage signal acquired by the residual current transformer is compared with the leakage signal reference value, if the leakage signal reference value is larger than the leakage signal reference value, the alarm unit is controlled to send an alarm signal, and the alarm information is uploaded to the monitoring center through the communication unit;
sensor inspection mode: the control processing system analyzes and compares the induced voltage signals, judges whether the residual current transformer works normally or not, controls the alarm unit to give an alarm if the residual current transformer works abnormally, displays the abnormality of the sensor by the display unit, and uploads the abnormal information of the residual current transformer to the monitoring center through the communication unit;
a relay checking mode: controlling the second contact to be closed, controlling the self-checking current generating unit to generate a self-checking residual current signal, transmitting the self-checking residual current signal to the detection winding, generating a corresponding induced voltage signal by the secondary winding, monitoring whether the first contact is disconnected, and if the first contact is disconnected, the relay works normally, controlling the first contact to be closed, and disconnecting the second contact; if the relay is not disconnected, the relay is in fault, the alarm unit is controlled to give an alarm, the display unit displays the abnormality of the relay, and the abnormal information of the relay is uploaded to the monitoring center through the communication unit;
and the control processing unit sets a checking period and performs periodic self-checking work on the residual current transformer and the relay respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911241463.6A CN110927623A (en) | 2019-12-06 | 2019-12-06 | Power equipment electric leakage detection system |
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| CN201911241463.6A CN110927623A (en) | 2019-12-06 | 2019-12-06 | Power equipment electric leakage detection system |
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| CN110927623A true CN110927623A (en) | 2020-03-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415465A (en) * | 2020-10-21 | 2021-02-26 | 国网江苏省电力有限公司盐城供电分公司 | Remote electric energy meter fault detection and identification system |
| CN112650068A (en) * | 2020-09-22 | 2021-04-13 | 杭州金胜电子科技有限公司 | Household fault detection method and device based on intelligent current sensor |
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| JPH09182278A (en) * | 1995-12-25 | 1997-07-11 | R B Controls Kk | Earth leakage protector |
| CN202903864U (en) * | 2012-10-22 | 2013-04-24 | 山西省电力公司长治供电分公司 | Electric leakage current detection device of single-phase AC power supply circuit |
| CN203225510U (en) * | 2013-04-22 | 2013-10-02 | 肖友盛 | Residual-current circuit breaker with self-checking function |
| CN104253411A (en) * | 2013-06-26 | 2014-12-31 | 成都昊地科技有限责任公司 | Protective circuit having functions of both alarm and electric leakage detection |
| CN204633310U (en) * | 2015-03-26 | 2015-09-09 | 湖南紫光测控有限公司 | A kind of intelligent fire-proofing device based on residual current self-inspection |
| CN108879596A (en) * | 2017-05-09 | 2018-11-23 | 上海复旦微电子集团股份有限公司 | A kind of leakage protection circuit with power supply monitoring function |
| CN110531211A (en) * | 2019-10-09 | 2019-12-03 | 青岛鼎信通讯股份有限公司 | A kind of circuit arrangement for alternating current-direct current current leakage detection system |
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2019
- 2019-12-06 CN CN201911241463.6A patent/CN110927623A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09182278A (en) * | 1995-12-25 | 1997-07-11 | R B Controls Kk | Earth leakage protector |
| CN202903864U (en) * | 2012-10-22 | 2013-04-24 | 山西省电力公司长治供电分公司 | Electric leakage current detection device of single-phase AC power supply circuit |
| CN203225510U (en) * | 2013-04-22 | 2013-10-02 | 肖友盛 | Residual-current circuit breaker with self-checking function |
| CN104253411A (en) * | 2013-06-26 | 2014-12-31 | 成都昊地科技有限责任公司 | Protective circuit having functions of both alarm and electric leakage detection |
| CN204633310U (en) * | 2015-03-26 | 2015-09-09 | 湖南紫光测控有限公司 | A kind of intelligent fire-proofing device based on residual current self-inspection |
| CN108879596A (en) * | 2017-05-09 | 2018-11-23 | 上海复旦微电子集团股份有限公司 | A kind of leakage protection circuit with power supply monitoring function |
| CN110531211A (en) * | 2019-10-09 | 2019-12-03 | 青岛鼎信通讯股份有限公司 | A kind of circuit arrangement for alternating current-direct current current leakage detection system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112650068A (en) * | 2020-09-22 | 2021-04-13 | 杭州金胜电子科技有限公司 | Household fault detection method and device based on intelligent current sensor |
| CN112650068B (en) * | 2020-09-22 | 2021-10-22 | 杭州金胜电子科技有限公司 | Household fault detection method and device based on intelligent current sensor |
| CN112415465A (en) * | 2020-10-21 | 2021-02-26 | 国网江苏省电力有限公司盐城供电分公司 | Remote electric energy meter fault detection and identification system |
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