CN204116589U - A kind of current transformer for metering secondary circuit failure pick-up unit - Google Patents
A kind of current transformer for metering secondary circuit failure pick-up unit Download PDFInfo
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- CN204116589U CN204116589U CN201420594638.8U CN201420594638U CN204116589U CN 204116589 U CN204116589 U CN 204116589U CN 201420594638 U CN201420594638 U CN 201420594638U CN 204116589 U CN204116589 U CN 204116589U
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- 238000001514 detection method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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Abstract
The utility model provides a kind of current transformer for metering secondary circuit failure pick-up unit, and described device comprises digital processing part, high-frequency voltage signal generating portion, secondary loop current detecting portion and power load control terminal; Described digital processing part is connected with described high-frequency voltage signal generating portion, described secondary loop current detecting portion and described power load control terminal respectively by ARM single-chip microcomputer STM32F407.This device is simple, reliably, can detect the parameter such as impedance, electric energy on sensed current transformer secondary circuit in real time, for secondary circuit failure analysis provides reliable Data Source.
Description
Technical field:
The utility model relates to a kind of pick-up unit, specifically relates to a kind of current transformer for metering secondary circuit failure pick-up unit.
Background technology:
Current transformer is the important composition equipment in Operation of Electric Systems and electric energy metrical, is get in touch with element between primary system and electrical secondary system in alternating circuit, for transmission of information to measurement instrument, protection and control device etc.
During current transformer runs, the contingent fault of secondary circuit comprises: poor contact of contacts, contact are damaged, artificially short circuit or disconnection, mutual inductor damage etc., and these faults all can be summed up as secondary circuit open circuit or short circuit in current return; Secondary loop of mutual inductor fault will directly affect the accuracy of electric energy metrical, even causes electric power safety accident.
Following two kinds of modes are generally had at present to the fault detection method of metering current mulual inductor, one is usually in the erecting stage of metering current mulual inductor, with the voltage of common voltage table measurement current transform er secondary circuit output terminal, with the electric current of pincerlike meter measurement current transform er secondary circuit, whether the variance estimation metering current mulual inductor according to the system power that has that it's too late of using electricity system voltage exists fault; Two is install prime dedicated test current transformer additional at the input end of electric network source, and the difference according to dedicated test current transformer and metering current mulual inductor secondary output current value judges whether to there is fault.These two kinds of detection modes carry out testing owing to all needing testing staff to scene, and sometimes also need power failure operation, there is the problem of real-time, accuracy and poor reliability in utilization process.
Therefore, need to provide a kind of current transformer for metering secondary circuit failure pick-up unit, detect the duty of metering current mulual inductor with real-time online, Timeliness coverage metering current mulual inductor secondary circuit failure and anti-electricity-theft detection etc.
Utility model content:
In order to overcome above-mentioned deficiency existing in prior art, the utility model proposes a kind of current transformer for metering secondary circuit failure pick-up unit.
The technical scheme that the utility model provides is: a kind of current transformer for metering secondary circuit failure pick-up unit, and its improvements are: described device comprises digital processing part, high-frequency voltage signal generating portion, secondary loop current detecting portion and power load control terminal; Described digital processing part is connected with described high-frequency voltage signal generating portion, described secondary loop current detecting portion and described power load control terminal respectively by ARM single-chip microcomputer STM32F407.
Preferably, described high-frequency voltage signal generating portion comprises: power amplifier TDA8498, DDS frequency synthesizer AD9850 and voltage transformer (VT); Described DDS frequency synthesizer AD9850 is connected with described ARM single-chip microcomputer STM32F407 by spi bus, and it is connected with described power amplifier TDA8498 by simulation single-ended signal line; Described power amplifier TDA8498 is by a winding switching of analog signal line and voltage transformer (VT).
Preferably, described secondary loop current detecting portion comprises: current transformer, signal condition unit, Hi-pass filter, low-pass filter and AD converter ADS8556; The input end of described signal condition unit is connected by the Secondary Winding of analog signal line with described current transformer, and its output terminal is connected with the input end of described Hi-pass filter and the input end of described low-pass filter respectively by analog signal line; The output terminal of described Hi-pass filter is connected respectively by the input end of differential analog signal line with described AD converter ADS8556 with the output terminal of described low-pass filter.
Preferably, described digital processes is divided and is comprised ARM single-chip microcomputer STM32F407, dynamic storage SRM61LV102416, code translator 74HC139; Described ARM single-chip microcomputer is connected with described code translator 74HC139, described dynamic storage SRM61LV102416 and AD converter ADS8556 with address bus by data bus.
Further, described ARM single-chip microcomputer STM32F407 is connected with keyboard by I/O interface line; It is connected with 480*320LCD LCDs by FSMC bus.
Further, described ARM single-chip microcomputer STM32F407 is also connected with USB interface and hummer.
Preferably, the primary circuit of sensed current mutual inductor connects power current source, and its secondary circuit is connected with electric energy meter through the center of voltage transformer (VT) summation current transformer; Described electric energy meter is connected with power load control terminal.
With immediate prior art ratio, the technical solution of the utility model has following beneficial effect:
(1) this device injection HF voltage voltage transformer (VT) and monitoring current Current Transformer all adopt a punching design, can realize not disconnecting secondary circuit, not impact measurement loop;
(2) the high-frequency signal generating portion of this device adopts DDS frequency synthesizer, power amplifier and voltage transformer (VT), injecting voltage signal is in secondary circuit non-faulting situation, amplitude is less, and frequency avoids first-harmonic and common harmonic frequency in system, does not affect electric energy meter and normally measures.
(3) this device detects and obtains the impedance of CT secondary circuit, the correlation parameters such as electric energy, can judge sensed current transformer secondary circuit fault by the parameter measured, and the fault analysis for secondary circuit provides comprehensively Data Source reliably.
Accompanying drawing illustrates:
The device hardware elementary diagram that Fig. 1 provides for the utility model;
Wherein: 1-sensed current mutual inductor; 2-voltage transformer pt; 3-current transformer.
Embodiment:
In order to understand the utility model better, below in conjunction with Figure of description and example, content of the present utility model is described further.
The device that the utility model provides is as shown in Figure 1:
1, the CT-1 secondary circuit wire of sensed current mutual inductor passes the voltage transformer (VT)-2 of 25:1 and the current transformer-3 of 300:1 by the mode of punching.Voltage transformer (VT)-2 is for secondary circuit injecting voltage; Current transformer-3 is for detecting electric current on secondary circuit, and this electric current is the superposed signal of the electric current that power current and injecting voltage produce;
2, STM32F407ARM single-chip microcomputer is connected by spi bus with DDS frequency synthesizer AD9850, produces relative set information by read-write spi bus to DDS frequency synthesizer AD9850, drives DDS to produce the high frequency sinusoidal waveform of 1531Hz.
3, DDS frequency synthesizer AD98508 is connected by simulating single-ended signal line with power amplifier TDA8498, the signal that power amplifier TDA8498 produces for amplifying DDS frequency synthesizer AD9850, improves its driving force;
4, the voltage transformer (VT) of power amplifier TDA8498 and 25:1 is connected by analog signal line, and the voltage transformer (VT) driving 25:1 is the sinusoidal waveform of 1531Hz to CT loop injected frequency, and amplitude is 0.4V;
5, the Secondary Winding of current transformer-3 is connected by analog signal line with signal condition unit, the power frequency component of signal condition unit to the high-frequency signal of the 1531Hz that current transformer detects and 50Hz carries out removal DC component, frequency-selecting is amplified, and produces corresponding voltage signal and is supplied to rear class;
6, signal condition unit is connected by the low-pass filter of analog signal line and cutoff frequency to be the Hi-pass filter of 1000Hz and cutoff frequency be 100Hz.The Hi-pass filter of 1000Hz 50Hz power frequency component in filtering mixed signal and other noise signals, the electric current that the Injection Signal obtaining clean 1531Hz produces is corresponding, 100Hz low-pass filter, for filtering high-frequency signal and other noise signals of 1531Hz in mixed signal, obtains clean 50Hz power frequency component;
7, the Hi-pass filter of 1000Hz, 100Hz low-pass filter is connected by differential analog signal line with ADS8556AD converter.AD converter 6 possesses 6 independently analog input channels, and its passage 1,2 is connected with Hi-pass filter and low-pass filter respectively, carries out AD conversion for the signal exported Hi-pass filter and low-pass filter;
8, ARM single-chip microcomputer STM32F407 is by data bus, address bus and code translator 74HC139, dynamic storage 61LV102416, and AD converter connects.The address signal that code translator produces for receiving ARM single-chip microcomputer STM32F407, decoding goes out the work enable signal of dynamic storage 61LV102416 and AD converter, coordinate with read-write enable signal, make AD converter export to Hi-pass filter and low-pass filter correct being transferred in 61LV102416 dynamic storage of numerical value produced.Upon completion of the transmission, the shape information of the representative current signal be stored in dynamic storage 61LV102416 is read out by code translator 74HC139 by ARM single-chip microcomputer STM32F407 again;
9, power load control terminal is used for the electric energy in reading power meters, voltage, electric current, power and power factor, and above-mentioned parameter value is transferred to ARM single-chip microcomputer STM32F407, shows through LCD liquid crystal display screen.
10, keyboard is connected by I/O interface line with ARM single-chip microcomputer STM32F407, and keyboard is used for user's input information, and passes to ARM single-chip microcomputer STM32F407 by I/O interface line;
11,480*320LCD display screen is connected with ARM single-chip microcomputer STM32F407 by FSMC bus, for showing the parameter information of the secondary circuit that failure detector obtains, comprise: be injected into the high-frequency voltage signal value on sensed current loop, inject the high-frequency current signal value that HF voltage produces, the power frequency current signal value of secondary circuit itself, the electric energy that electric energy meter measures, voltage, electric current, power and power factor.These parameters are that the secondary circuit failure analysis of sensed current mutual inductor provides reliable and comprehensive Data Source.
12, ARM single-chip microcomputer STM32F407 can be connected with remote gathering system interface by USB interface, remote gathering system obtains the fault parameter that pick-up unit measures, by analyzing fault parameter, low cost can realize the on-line monitoring of transformer secondary circuit fault, Timeliness coverage metering current mulual inductor secondary circuit field failure and anti-electricity-theft detection; When detecting that secondary circuit is abnormal, ARM single-chip microcomputer STM32F407 produces alerting signal by controlling hummer.
These are only embodiment of the present utility model, be not limited to the utility model, all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all applying within the right of the present utility model awaited the reply.
Claims (7)
1. a current transformer for metering secondary circuit failure pick-up unit, is characterized in that: described device comprises digital processing part, high-frequency voltage signal generating portion, secondary loop current detecting portion and power load control terminal; Described digital processing part is connected with described high-frequency voltage signal generating portion, described secondary loop current detecting portion and described power load control terminal respectively by ARM single-chip microcomputer STM32F407.
2. a kind of current transformer for metering secondary circuit failure pick-up unit as claimed in claim 1, is characterized in that:
Described high-frequency voltage signal generating portion comprises: power amplifier TDA8498, DDS frequency synthesizer AD9850 and voltage transformer (VT); Described DDS frequency synthesizer AD9850 is connected with described ARM single-chip microcomputer STM32F407 by spi bus, and it is connected with described power amplifier TDA8498 by simulation single-ended signal line; Described power amplifier TDA8498 is by a winding switching of analog signal line and voltage transformer (VT).
3. a kind of current transformer for metering secondary circuit failure pick-up unit as claimed in claim 1, is characterized in that:
Described secondary loop current detecting portion comprises: current transformer, signal condition unit, Hi-pass filter, low-pass filter and AD converter ADS8556; The input end of described signal condition unit is connected by the Secondary Winding of analog signal line with described current transformer, and its output terminal is connected with the input end of described Hi-pass filter and the input end of described low-pass filter respectively by analog signal line; The output terminal of described Hi-pass filter is connected respectively by the input end of differential analog signal line with described AD converter ADS8556 with the output terminal of described low-pass filter.
4. a kind of current transformer for metering secondary circuit failure pick-up unit as claimed in claim 1, is characterized in that:
Described digital processes is divided and is comprised ARM single-chip microcomputer STM32F407, dynamic storage SRM61LV102416, code translator 74HC139; Described ARM single-chip microcomputer is connected with described code translator 74HC139, described dynamic storage SRM61LV102416 and AD converter ADS8556 with address bus by data bus.
5. a kind of current transformer for metering secondary circuit failure pick-up unit as claimed in claim 4, is characterized in that:
Described ARM single-chip microcomputer STM32F407 is connected with keyboard by I/O interface line; It is connected with 480*320LCD LCDs by FSMC bus.
6. a kind of current transformer for metering secondary circuit failure pick-up unit as claimed in claim 5, is characterized in that: described ARM single-chip microcomputer STM32F407 is also connected with USB interface and hummer.
7. a kind of current transformer for metering secondary circuit failure pick-up unit as claimed in claim 1, is characterized in that:
The primary circuit of sensed current mutual inductor connects power current source, and its secondary circuit is connected with electric energy meter through the center of voltage transformer (VT) summation current transformer; Described electric energy meter is connected with power load control terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420594638.8U CN204116589U (en) | 2014-10-14 | 2014-10-14 | A kind of current transformer for metering secondary circuit failure pick-up unit |
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| CN201420594638.8U CN204116589U (en) | 2014-10-14 | 2014-10-14 | A kind of current transformer for metering secondary circuit failure pick-up unit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849649A (en) * | 2015-05-26 | 2015-08-19 | 中国电力科学研究院 | System and method for detecting state of secondary circuit of current transformer for metering |
| 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 |
| CN106569078A (en) * | 2016-10-25 | 2017-04-19 | 中国电力科学研究院 | State detection method and system for secondary circuit of current transformer |
| CN106707026A (en) * | 2017-01-05 | 2017-05-24 | 中国电力科学研究院 | Device for measuring electric reactance of electric energy metering secondary circuit |
| CN109142826A (en) * | 2018-09-05 | 2019-01-04 | 云南电网有限责任公司曲靖供电局 | Adaptive metering fault load records equipment, System and method for |
| CN110221239A (en) * | 2019-06-28 | 2019-09-10 | 深圳市锐能微科技有限公司 | Three-phase current detection circuit, method and electric energy computation chip |
| CN115144807A (en) * | 2022-09-05 | 2022-10-04 | 武汉格蓝若智能技术有限公司 | Differential noise filtering and current-carrying grading current transformer online evaluation method and device |
| CN117075027A (en) * | 2023-10-16 | 2023-11-17 | 江苏纳通能源技术有限公司 | CT transformer fault identification method and identification system thereof |
-
2014
- 2014-10-14 CN CN201420594638.8U patent/CN204116589U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849649A (en) * | 2015-05-26 | 2015-08-19 | 中国电力科学研究院 | System and method for detecting state of secondary circuit of current transformer for metering |
| 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 |
| 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 |
| CN106569078A (en) * | 2016-10-25 | 2017-04-19 | 中国电力科学研究院 | State detection method and system for secondary circuit of current transformer |
| CN106707026A (en) * | 2017-01-05 | 2017-05-24 | 中国电力科学研究院 | Device for measuring electric reactance of electric energy metering secondary circuit |
| CN109142826A (en) * | 2018-09-05 | 2019-01-04 | 云南电网有限责任公司曲靖供电局 | Adaptive metering fault load records equipment, System and method for |
| CN110221239A (en) * | 2019-06-28 | 2019-09-10 | 深圳市锐能微科技有限公司 | Three-phase current detection circuit, method and electric energy computation chip |
| CN115144807A (en) * | 2022-09-05 | 2022-10-04 | 武汉格蓝若智能技术有限公司 | Differential noise filtering and current-carrying grading current transformer online evaluation method and device |
| CN115144807B (en) * | 2022-09-05 | 2022-12-02 | 武汉格蓝若智能技术有限公司 | Differential noise filtering and current-carrying grading current transformer online evaluation method and device |
| CN117075027A (en) * | 2023-10-16 | 2023-11-17 | 江苏纳通能源技术有限公司 | CT transformer fault identification method and identification system thereof |
| CN117075027B (en) * | 2023-10-16 | 2024-01-26 | 江苏纳通能源技术有限公司 | CT transformer fault identification method and identification system thereof |
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