CN203037775U - Fault detection device for metering current transformer - Google Patents
Fault detection device for metering current transformer Download PDFInfo
- Publication number
- CN203037775U CN203037775U CN 201320008527 CN201320008527U CN203037775U CN 203037775 U CN203037775 U CN 203037775U CN 201320008527 CN201320008527 CN 201320008527 CN 201320008527 U CN201320008527 U CN 201320008527U CN 203037775 U CN203037775 U CN 203037775U
- Authority
- CN
- China
- Prior art keywords
- chip
- pick
- processor
- metering
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Electric Clocks (AREA)
Abstract
The application provides a fault detection device for a metering current transformer; the device is connected in series in a current transformer secondary circuit and is connected with voltage signal, and circuit electric parameters and complex impedance value are collected through an electric parameter testing chip and an impedance testing chip; when a zero-crossing detector detects current signal to be at a zero-crossing point, a processor will calculate impedance amplitude and relative phase of each frequency point, and the electric parameter testing chip is combined to determine an open circuit state and a short circuit state of the current transformer secondary circuit; if the processor detects abnormal condition, a present clock time of a real-time clock chip will be read to form an event record, the event record will be stored in a data memory, and states and parameters will be displayed through a display device, thereby accurately and reliably detecting faults of the metering current transformer secondary circuit. Furthermore, the fault detection device is connected with a remote acquisition system through a data communication interface to realize on-line monitoring of faults of the transformer secondary circuit with low cost; metering electric transformer secondary circuit on-site faults can be timely found out, and anti-electricity stealing detection can be timely carried out.
Description
Technical field
The utility model relates to power electronics fault detection technique field, in particular, relates to a kind of current transformer failure metering pick-up unit.
Background technology
The fault detect of metering current mulual inductor normally detects at faults such as the reduction of metering current mulual inductor secondary coil insulating property, turn-to-turn short circuit, input and output terminal loose contact, transformer ratio, the artificial open circuit of secondary output loop and short circuits.
Fault detection method to metering current mulual inductor generally has following dual mode at present, first kind normally in the erecting stage of metering current mulual inductor, measure the voltage of secondary loop of mutual inductor output terminal by adopting the common voltage table, measure the electric current of secondary loop of mutual inductor with pincerlike meter, whether have fault according to the variance estimation metering current mulual inductor of the system power that has that it's too late of using electricity system voltage; Second kind is that input end at electric network source installs prime dedicated test current transformer additional, judges whether to exist fault according to the difference of dedicated test current transformer and metering current mulual inductor secondary output current value.These two kinds of detection modes are owing to all need the testing staff to carry out testing to the scene, and also need the operation that has a power failure sometimes, have the problem of real-time, accuracy and poor reliability in the utilization process.
Therefore, a kind of current transformer failure metering pick-up unit is provided, duty that can the real time on-line monitoring metering current mulual inductor is in time found metering current mulual inductor secondary circuit field failure and anti-electricity-theft detection etc., is those skilled in the art's problem demanding prompt solutions.
The utility model content
In view of this, the utility model provides a kind of current transformer failure metering pick-up unit, can solve the duty of real time on-line monitoring metering current mulual inductor, in time find problems such as metering current mulual inductor secondary circuit field failure and anti-electricity-theft detection.
For achieving the above object, the utility model provides following technical scheme:
A kind of current transformer failure metering pick-up unit comprises:
Processor;
Be connected with described processor, the power supply of power supply is provided for described processor;
Be connected with described processor, gather electric parameter measurement chip and the impedance measurement chip of described metering current mulual inductor secondary circuit electrical quantity and complex impedance value;
Be connected with described processor, obtain the synchronizing signal at zero point of described metering current mulual inductor secondary loop current signal, and with described zero point synchronizing signal amplify the zero-crossing detector that the rear drive triode obtains pulse signal;
Be connected with described processor, the real-time timepiece chip of real-time clock is provided for described pick-up unit;
Be connected the data-carrier store that the data after the information of described processor reception is handled are stored with described processor;
Be connected the display that the duty of described metering current mulual inductor, detected described complex impedance value and described electrical quantity are shown with described processor;
Described pick-up unit is provided with the data communication interface that carries out data interaction with remote gathering system.
Preferably, described processor is the 32-bit processor.
Preferably, described power supply is linear power supply, through two groups of insulating power supplies of voltage stabilizer output 12V100mA and 5V50mA.
Preferably, described electric parameter measurement chip is ADI high-performance three phase metering chip ADE7858, provides electrical quantity through the I2C bus to described processor, and described electrical quantity comprises: voltage, electric current, frequency and harmonic wave.
Preferably, described impedance measurement chip comprises AD5933 chip and peripheral circuit, the integrated frequency generator of described AD5933 chip and analog to digital converter.
Preferably, described real-time timepiece chip is RX-8025T type I
2The real-time timepiece chip of C bus interface, the 32.768kHz crystal oscillator that built-in high precision frequency is adjusted and high-precision timing precision are adjusted circuit.
Preferably, described data-carrier store adopts I
2The EEPROM storage chip of C bus interface.
Preferably, described display adopts 48 segmentation charactrons.
Preferably, described data communication interface adopts the special-purpose RS485 Bus Interface Chip of isolating.
Via above-mentioned technical scheme as can be known, compared with prior art, the utility model openly provides a kind of current transformer failure metering pick-up unit, is made up of power supply, electric parameter measurement chip, zero-crossing detector, impedance measurement chip, processor, real-time timepiece chip and data communication interface.This device series connection inserts secondary loop of mutual inductor, insert voltage signal simultaneously, by electrical quantitys such as electric parameter measurement chip measuring voltage, electric current, frequency and harmonic waves, zero-crossing detector detects when current signal is in zero crossing in the secondary loop of mutual inductor, the impedance measurement chip sends the 1-50KHz pumping signal, injects secondary loop of mutual inductor through driving coupled circuit, and detects feedback signal, after discrete Fourier transformation is handled, return a complex values at each Frequency point.Processor calculates impedance amplitude and the relative phase of each Frequency point, in conjunction with the electric parameter measurement chip, judges open circuit and the short-circuit condition of secondary loop of mutual inductor; Form logout and deposit data-carrier store in when processor detects present clock that secondary circuit reads real-time timepiece chip after unusual, and carry out state and parameter by display and show, can detect the faults such as open circuit, short circuit, turn-to-turn short circuit, input and output terminal loose contact of metering current mulual inductor secondary circuit accurately and reliably.
In addition, be connected with the remote gathering system interface by data communication interface, can the low-cost on-line monitoring of realizing the transformer secondary circuit fault, in time find metering current mulual inductor secondary circuit field failure and anti-electricity-theft detection.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
Fig. 1 is the structural representation of the disclosed a kind of current transformer failure metering pick-up unit of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model openly provides a kind of current transformer failure metering pick-up unit, its series connection inserts secondary loop of mutual inductor, and access voltage signal, by electric parameter measurement chip and impedance measurement chip acquisition circuit electrical quantity and complex impedance value, when the zero-crossing detector sensed current signal is in zero crossing, processor calculates impedance amplitude and the relative phase of each Frequency point, judges open circuit and the short-circuit condition of secondary loop of mutual inductor in conjunction with the electric parameter measurement chip; The present clock that reads real-time timepiece chip after processor detects unusually forms logout, and deposits data-carrier store in, and carries out state and parameter demonstration by display, and the fault to the metering current mulual inductor secondary circuit detects accurately and reliably.In addition, be connected with remote gathering system by data communication interface, can the low-cost on-line monitoring of realizing the transformer secondary circuit fault, in time find metering current mulual inductor secondary circuit field failure and anti-electricity-theft detection.
See also accompanying drawing 1, be the structural representation of the disclosed a kind of current transformer failure metering pick-up unit of the utility model embodiment.The utility model embodiment discloses a kind of current transformer failure metering pick-up unit, and this pick-up unit specifically comprises: processor 1; Be connected with processor 1, the power supply 2 of power supply is provided for processor 1; Be connected with processor 2, gather electric parameter measurement chip 3 and the impedance measurement chip 4 of described metering current mulual inductor secondary circuit electrical quantity and complex impedance value; Be connected with processor 1, obtain the synchronizing signal at zero point of metering current mulual inductor secondary loop current signal, and with zero point synchronizing signal amplify the zero-crossing detector 5 that the rear drive triode obtains pulse signal; Be connected with processor 1, the real-time timepiece chip 6 of real-time clock is provided for pick-up unit; Be connected the data-carrier store 7 that the data after the information of processor reception is handled are stored with processor 1; Be connected the display 8 that the duty of metering current mulual inductor, detected complex impedance value and electrical quantity are shown with processor 1; This pick-up unit is provided with the data communication interface 9 that carries out data interaction with remote gathering system.
This device series connection inserts secondary loop of mutual inductor, insert voltage signal simultaneously, by electrical quantitys such as electric parameter measurement chip measuring voltage, electric current, frequency and harmonic waves, zero-crossing detector detects when current signal is in zero crossing in the secondary loop of mutual inductor, the impedance measurement chip sends the 1-50KHz pumping signal, injects secondary loop of mutual inductor through driving coupled circuit, and detects feedback signal, after discrete Fourier transformation is handled, return a complex values at each Frequency point.Processor calculates impedance amplitude and the relative phase of each Frequency point, in conjunction with the electric parameter measurement chip, judges open circuit and the short-circuit condition of secondary loop of mutual inductor; Form logout and deposit data-carrier store in when processor detects present clock that secondary circuit reads real-time timepiece chip after unusual, and carry out state and parameter by display and show, can detect the faults such as open circuit, short circuit, turn-to-turn short circuit, input and output terminal loose contact of metering current mulual inductor secondary circuit accurately and reliably.
In addition, be connected with the remote gathering system interface by data communication interface, can the low-cost on-line monitoring of realizing the transformer secondary circuit fault, in time find metering current mulual inductor secondary circuit field failure and anti-electricity-theft detection.
Preferably, above-mentioned processor 1 is the 32-bit processor, be responsible for calculating impedance amplitude and the relative phase of each Frequency point, the correlation parameter that reads the electric parameter measurement chip carries out fault and judges, after detecting fault, read the clock information of real-time timepiece chip, generate failure logging and deposit data-carrier store in, and carry out the state demonstration by display, simultaneously, the processor communication request of response data communication interface also.
Preferably, above-mentioned power supply 2 is linear power supply, through two groups of insulating power supplies of voltage stabilizer output 12V100mA and 5V50mA.
Preferably, above-mentioned electric parameter measurement chip 3 is ADI high-performance three phase metering chip ADE7858, through I
2The C bus provides electrical quantity to described processor, and described electrical quantity comprises: voltage, electric current, frequency and harmonic wave.
Preferably, above-mentioned impedance measurement chip 4 comprises AD5933 chip and peripheral circuit, the integrated frequency generator of described AD5933 chip and analog to digital converter.AD5933 is a high-precision impedance transducer system scheme, the pumping signal that the frequency generator of AD5933 produces is through driving coupled circuit, on the current signal in the current signal zero passage is sent to the metering current mulual inductor secondary circuit constantly, response detects the loop pumping signal on the received current signal simultaneously, sends in the ADC of AD5933 after amplifying processing.The ADC sampled data of AD5933 is carried out discrete Fourier transformation and is handled, at each Frequency point through I
2The C bus is returned a complex values to processor unit.
Preferably, above-mentioned real-time timepiece chip 6 is RX-8025T type I
2The real-time timepiece chip of C bus interface, the 32.768kHz crystal oscillator that built-in high precision frequency is adjusted and high-precision timing precision are adjusted circuit.
Preferably, above-mentioned data-carrier store 7 adopts the EEPROM storage chip of I2C bus interface, and the EEPROM storage chip can effectively be preserved data more than 10 years.
Preferably, aforementioned display device 8 adopts 48 segmentation charactrons, in turn display working condition, resistance value and electrical quantity.
Preferably, above-mentioned data communication interface 9 adopts the special-purpose RS485 Bus Interface Chip of isolating, and this data-interface is supported the DL/T645-2007 communication protocol.
In sum, the utility model openly provides a kind of current transformer failure metering pick-up unit, is made up of power supply, electric parameter measurement chip, zero-crossing detector, impedance measurement chip, processor, real-time timepiece chip and data-interface.This device series connection inserts secondary loop of mutual inductor, insert voltage signal simultaneously, by electrical quantitys such as electric parameter measurement chip measuring voltage, electric current, frequency and harmonic waves, zero-crossing detector detects when current signal is in zero crossing in the secondary loop of mutual inductor, the impedance measurement chip sends the 1-50KHz pumping signal, injects secondary loop of mutual inductor through driving coupled circuit, and detects feedback signal, after discrete Fourier transformation is handled, return a complex values at each Frequency point.Processor calculates impedance amplitude and the relative phase of each Frequency point, in conjunction with the electric parameter measurement chip, judges open circuit and the short-circuit condition of secondary loop of mutual inductor; Form logout and deposit data-carrier store in when processor detects present clock that secondary circuit reads real-time timepiece chip after unusual, and carry out state and parameter by display and show, can detect the faults such as open circuit, short circuit, turn-to-turn short circuit, input and output terminal loose contact of metering current mulual inductor secondary circuit accurately and reliably.
In addition, be connected with the remote gathering system interface by data communication interface, can the low-cost on-line monitoring of realizing the transformer secondary circuit fault, in time find metering current mulual inductor secondary circuit field failure and anti-electricity-theft detection.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments herein.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a current transformer failure metering pick-up unit is characterized in that, comprising:
Processor;
Be connected with described processor, the power supply of power supply is provided for described processor;
Be connected with described processor, gather electric parameter measurement chip and the impedance measurement chip of described metering current mulual inductor secondary circuit electrical quantity and complex impedance value;
Be connected with described processor, obtain the synchronizing signal at zero point of described metering current mulual inductor secondary loop current signal, and with described zero point synchronizing signal amplify the zero-crossing detector that the rear drive triode obtains pulse signal;
Be connected with described processor, the real-time timepiece chip of real-time clock is provided for described pick-up unit;
Be connected the data-carrier store that the data after the information of described processor reception is handled are stored with described processor;
Be connected the display that the duty of described metering current mulual inductor, detected described complex impedance value and described electrical quantity are shown with described processor;
Described pick-up unit is provided with the data communication interface that carries out data interaction with remote gathering system.
2. pick-up unit according to claim 1 is characterized in that, described processor is the 32-bit processor.
3. pick-up unit according to claim 1 is characterized in that, described power supply is linear power supply, through two groups of insulating power supplies of voltage stabilizer output 12V100mA and 5V50mA.
4. pick-up unit according to claim 1 is characterized in that, described electric parameter measurement chip is ADI high-performance three phase metering chip ADE7858, through I
2The C bus provides electrical quantity to described processor, and described electrical quantity comprises: voltage, electric current, frequency and harmonic wave.
5. pick-up unit according to claim 1 is characterized in that, described impedance measurement chip comprises AD5933 chip and peripheral circuit, the integrated frequency generator of described AD5933 chip and analog to digital converter.
6. pick-up unit according to claim 1 is characterized in that, described real-time timepiece chip is RX-8025T type I
2The real-time timepiece chip of C bus interface, the 32.768kHz crystal oscillator that built-in high precision frequency is adjusted and high-precision timing precision are adjusted circuit.
7. pick-up unit according to claim 1 is characterized in that, described data-carrier store adopts the EEPROM storage chip of I2C bus interface.
8. pick-up unit according to claim 1 is characterized in that, described display adopts 48 segmentation charactrons.
9. pick-up unit according to claim 1 is characterized in that, described data communication interface adopts the special-purpose RS485 Bus Interface Chip of isolating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320008527 CN203037775U (en) | 2013-01-08 | 2013-01-08 | Fault detection device for metering current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320008527 CN203037775U (en) | 2013-01-08 | 2013-01-08 | Fault detection device for metering current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203037775U true CN203037775U (en) | 2013-07-03 |
Family
ID=48689886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320008527 Expired - Fee Related CN203037775U (en) | 2013-01-08 | 2013-01-08 | Fault detection device for metering current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203037775U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215929A (en) * | 2014-09-25 | 2014-12-17 | 国家电网公司 | Electronic transformer status monitor system |
| CN104330677A (en) * | 2014-11-18 | 2015-02-04 | 山东电力设备有限公司 | Device and method for testing electronic type current transformer |
| CN105116270A (en) * | 2015-07-16 | 2015-12-02 | 南京国电南自电网自动化有限公司 | Mutual inductor fault detection method for merging unit and protection control device |
| CN106338704A (en) * | 2015-07-14 | 2017-01-18 | 重庆龙源科技产业发展有限公司 | Real-time detection device suitable for failure and electricity larceny prevention of metering current transformer |
| CN106918796A (en) * | 2017-04-27 | 2017-07-04 | 中国电力科学研究院 | A kind of secondary loop of mutual inductor impedance on-line detecting system and method |
| CN107015095A (en) * | 2017-03-23 | 2017-08-04 | 中国电力科学研究院 | A kind of method and system that secondary loop of mutual inductor state is judged based on Transient Method |
| CN110794334A (en) * | 2019-11-26 | 2020-02-14 | 武汉帆茂电子科技有限公司 | Universal signal line open-short circuit detection device and detection method adopting frequency mode |
| CN112415287A (en) * | 2020-11-16 | 2021-02-26 | 中国电力科学研究院有限公司 | Method and system for identifying transformation ratio replacement of metering current transformer |
-
2013
- 2013-01-08 CN CN 201320008527 patent/CN203037775U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215929A (en) * | 2014-09-25 | 2014-12-17 | 国家电网公司 | Electronic transformer status monitor system |
| CN104330677A (en) * | 2014-11-18 | 2015-02-04 | 山东电力设备有限公司 | Device and method for testing electronic type current transformer |
| CN104330677B (en) * | 2014-11-18 | 2017-07-18 | 山东电力设备有限公司 | A kind of electronic current mutual inductor experimental rig and test method |
| CN106338704A (en) * | 2015-07-14 | 2017-01-18 | 重庆龙源科技产业发展有限公司 | Real-time detection device suitable for failure and electricity larceny prevention of metering current transformer |
| CN105116270A (en) * | 2015-07-16 | 2015-12-02 | 南京国电南自电网自动化有限公司 | Mutual inductor fault detection method for merging unit and protection control device |
| CN105116270B (en) * | 2015-07-16 | 2018-03-27 | 南京国电南自电网自动化有限公司 | A kind of mulual inductor malfunction detection method for being used for combining unit, protecting control device |
| CN107015095A (en) * | 2017-03-23 | 2017-08-04 | 中国电力科学研究院 | A kind of method and system that secondary loop of mutual inductor state is judged based on Transient Method |
| CN106918796A (en) * | 2017-04-27 | 2017-07-04 | 中国电力科学研究院 | A kind of secondary loop of mutual inductor impedance on-line detecting system and method |
| CN110794334A (en) * | 2019-11-26 | 2020-02-14 | 武汉帆茂电子科技有限公司 | Universal signal line open-short circuit detection device and detection method adopting frequency mode |
| CN112415287A (en) * | 2020-11-16 | 2021-02-26 | 中国电力科学研究院有限公司 | Method and system for identifying transformation ratio replacement of metering current transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203037775U (en) | Fault detection device for metering current transformer | |
| CN204116589U (en) | A kind of current transformer for metering secondary circuit failure pick-up unit | |
| CN106018985B (en) | The detection method and its system of three-phase electric energy meter voltage negative phase sequence | |
| CN104076321B (en) | On-line monitoring and evaluating system and method for digital electric energy meter | |
| CN202443082U (en) | Merging unit test system with analog input and university | |
| CN203965613U (en) | A kind of emulation test system of earth-fault indicator performance | |
| CN203700528U (en) | Cathode protection switch-off potential synchronous monitor | |
| CN102590700A (en) | Method and device for quickly locating faults of overhead line on basis of time synchronization | |
| CN201402286Y (en) | Voltage drop detecting device of secondary circuit of voltage transformer | |
| CN103323655B (en) | Non-contact alternating current and direct current crosstalk online detecting device and non-contact alternating current and direct current crosstalk online detecting method | |
| CN203722628U (en) | Power carrier channel communication tester | |
| CN201845051U (en) | Three-phase intelligent electric energy meter | |
| CN110161358A (en) | A kind of Earth design method and device | |
| CN203069728U (en) | Portable DC grounding system fault locator | |
| CN106485899A (en) | Family table wiring test device and its method of testing based on the power frequency distortion communication technology | |
| CN102981061A (en) | Direct earth capacitance gauge in converting station power distribution system | |
| CN201464598U (en) | Concealed cable fault detector | |
| CN201269915Y (en) | Travelling wave positioning apparatus for electricity grid failure | |
| CN202916338U (en) | Device for monitoring and recording electric power of electric equipment in real time | |
| CN209542825U (en) | A kind of on-line monitoring system of CVT measurement error state | |
| CN204065226U (en) | A kind of instantaneous peak voltage measuring instrument | |
| CN203433041U (en) | An electric energy meter provided with a communication function | |
| CN205193159U (en) | Dry -type air -core reactor loss detection device | |
| CN204595099U (en) | AC frequency conversion stake resistance on-line computing model | |
| CN107479020A (en) | Single-phase measurement Fault Identification device and processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160628 Address after: 401121 north of the city of Chongqing high tech park, Mount Huangshan Middle Road No. 66 Patentee after: CHONGQING ZHIWANG TECHNOLOGY Co.,Ltd. Address before: 400015 No. 75 Renmin Road, Yuzhong District, Chongqing Patentee before: CHONGQING YUDIAN ELECTRIC POWER TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20220108 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |