CN102650669A - Charged detection device of substation equipment - Google Patents
Charged detection device of substation equipment Download PDFInfo
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- CN102650669A CN102650669A CN2012101590153A CN201210159015A CN102650669A CN 102650669 A CN102650669 A CN 102650669A CN 2012101590153 A CN2012101590153 A CN 2012101590153A CN 201210159015 A CN201210159015 A CN 201210159015A CN 102650669 A CN102650669 A CN 102650669A
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Abstract
The invention discloses a charged detection device of substation equipment. The charged detection device is characterized by comprising a current sensor unit, an I/V (Logarithmic Current-to-Voltage) conversion unit, a signal filtering amplification unit, a signal conditioning unit, an A/D (Analog to Digital) conversion unit, an industrial personal computer unit, a keyboard unit, a display unit and a power supply unit. The charged detection device can simultaneously detect various signals of a substation arrester and a transformer in a charged mode and can carry out real-time data processing and analysis through the industrial personal computer unit. Further, the accuracy and the high efficiency of the status maintenance work of a power supply system are increased, and a reliable guarantee is provided for the normal operation of the power supply system.
Description
Technical field
The present invention relates to a kind of substation equipment measuring device with electricity, particularly a kind of device that carries out charged detection for lightning arrester in the transformer station and transformer.
Background technology
Along with the continuous increase of transformer station's scale and quantity, the quantity of lightning arrester and transformer is more and more, and electric power system repair based on condition of component workload is heavy day by day.The metal current Zinc-Oxide Arrester has good nonlinear characteristic and is widely adopted, but it does not have series connection intermittently, the working voltage that directly bears for a long time in service; Valve block will produce deterioration gradually, and long-time running is made moist easily, and leakage current increased after valve block made moist; Deterioration condition is more serious, and leakage current further increases, and the resistive component in the leakage current produces active loss; The valve block temperature is raise, form thermal runaway and will cause Zinc-Oxide Arrester to damage.Make moist by superpotential, switching overvoltage, insulation owing to bearing for transformer, ground lug processing technology and design reasons such as bad; Cause or multipoint earthing when serious at 2; The loop current that forms between iron core and the earth can reach tens peaces; Cause the transformer core local overheating even burn, the accident that causes through the statistics multipoint earthing of iron core accounts for the front three in the Accident of Transformer.Therefore the service work of transformer station's electric power system is severe day by day, and the lightning arrester and the transformer belt electro-detection Equipment Inspection parameter of producing both at home and abroad at present are single, and every kind of equipment can only single detection lightning arrester or transformer.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point that a kind of substation equipment measuring device with electricity is provided; So that detect the charging operation signal and the multiple signal parameter of transformer station's lightning arrester and transformer simultaneously; Alleviate the workload of electric power system maintenance; Improve the accuracy and the high efficiency of charged detection, guarantee the smooth completion of electric power system repair based on condition of component work.
The present invention adopts following technical scheme for the technical solution problem:
The characteristics of substation equipment measuring device with electricity of the present invention are to comprise:
One current sensor unit; Comprise magnet ring and pickup coil; Be set in said magnet ring on the iron core grounding sheet of connecting line and transformer of arrester discharge counter, gather the charging operation signal of transformer and lightning arrester respectively, and output multichannel current sensing signal;
One comprises the I/V converting unit of micro current amplifier, and said I/V converting unit receives the multichannel current sensing signal of said current sensor unit, and the plurality of voltages signal after the conversion of I/V converting unit inserts follow-up signal filtering amplifying unit;
The one signal filtering amplifying unit that constitutes by filtering and amplifying circuit, the plurality of voltages signal that said signal filtering amplifying unit receives said I/V converting unit carries out filter amplifying processing, the output voltage signal of the high-frequency interferencing signal that is removed;
One includes the signal condition unit of raising level circuit, and said signal condition unit receives the output voltage signal of said signal filtering amplifying unit and raises, and obtains analog voltage signal;
One includes the A/D converting unit of multi-channel A/D conversion chip, and said A/D converting unit converts the analog voltage signal of said signal condition unit output into digital voltage signal;
One industrial computer unit comprises storage hard disk, communication module and CPU; Said industrial computer unit receives the digital voltage signal of said A/D converting unit through data line and analyzes; Obtain full current signal, harmonic signal, local discharge signal and the real component of lightning arrester respectively; And the ground current signal and the local discharge signal of transformer, and said each signal is transferred to display unit through data line show;
One keyboard unit is connected and controls sampling, data analysis and system's setting of said industrial computer unit through data line and said industrial computer unit.
Compared with present technology, beneficial effect of the present invention is embodied in:
1, the present invention has improved the unicity of checkout equipment detected parameters in the past, can realize the multiple signal of charged detection lightning arrester total current and transformer simultaneously, highly versatile, practicality height through the current sensor unit.
2, the present invention can handle and analyze data in real time through the industrial computer unit; Obtain the multiple current signal of lightning arrester and transformer; Realize the real-time measurement and the analysis of multiple parameter, alleviated the workload of system overhaul, improved the accuracy and the high efficiency of electric power system repair based on condition of component work; Be applicable to the repair based on condition of component work of each transformer station's lightning arrester and transformer, guaranteed the normal operation of electric power system.
Description of drawings
Fig. 1 is that pick-up unit of the present invention is formed structural representation;
Fig. 2 is a current sensor cellular construction synoptic diagram among the present invention;
Fig. 3 is I/V conversion unit circuit figure among the present invention;
Fig. 4 is a signal filtering amplifying unit circuit diagram among the present invention;
Fig. 5 is signal condition element circuit figure among the present invention.
Embodiment
As shown in Figure 1.The structure of present embodiment is to comprise:
The current sensor unit comprises magnet ring and pickup coil, and is as shown in Figure 2, and magnet ring is made up of a, b two parts, and pickup coil L1 is last around a, b.Magnet ring is set in the form of opening on the iron core grounding sheet of connecting line and transformer of arrester discharge counter, gathers the charging operation signal of transformer and lightning arrester respectively, and output multichannel current sensing signal;
The I/V converting unit that comprises micro current amplifier; As shown in Figure 3; The negative-feedback circuit that is made up of operational amplifier U1 and resistance R 1 converts the multichannel current sensing signal of I/V converting unit received current sensor unit into the plurality of voltages signal and inserts follow-up signal filtering amplifying unit; Wherein, resistance R 1 decision enlargement factor;
The signal filtering amplifying unit that constitutes by filtering and amplifying circuit; As shown in Figure 4; Operational amplifier U2, electric R2, capacitor C 1, resistance R 3 and R4 constitute active filter amplification circuit; R3/R4 determines enlargement factor, and the plurality of voltages signal that the signal filtering amplifying unit receives the I/V converting unit carries out filter amplifying processing, the output voltage signal of the high-frequency interferencing signal that is removed;
Include the signal condition unit of raising level circuit; As shown in Figure 5; Constitute by resistance R 5, R6, operational amplifier U3, diode D1 and D2 and to raise level circuit, the accept filter output voltage signal of amplifying unit of signal condition unit is raised, obtain analog voltage signal; The signal condition unit allows signal condition to be convenient to the A/D conversion chip and to sample within the scope of reception to the A/D conversion chip;
Include the A/D converting unit of multi-channel A/D conversion chip, said A/D converting unit converts the analog voltage signal of said signal condition unit output into digital voltage signal;
The industrial computer unit comprises storage hard disk, communication module and CPU; The industrial computer unit receives the digital voltage signal of A/D converting unit through data line and analyzes; Obtain full current signal, harmonic signal, local discharge signal and the real component of lightning arrester respectively; And the ground current signal and the local discharge signal of transformer; And each signal is transferred to display unit through data line show that display unit provides the good man-machine interaction interface, can demonstrate the analysis result of all signals intuitively;
Keyboard unit is connected and controls sampling, data analysis and system's setting of said industrial computer unit through data line and said industrial computer unit;
All direct supplys are to be provided by power supply unit in the pick-up unit, and power supply unit is with the input of 220V alternating current as power supply unit, and through the AC/DC change-over circuit, output ± 5V and ± 12V direct current are that pick-up unit is supplied power through power lead respectively.
Claims (1)
1. substation equipment measuring device with electricity is characterized in that comprising:
One current sensor unit; Comprise magnet ring and pickup coil; Be set in said magnet ring on the iron core grounding sheet of connecting line and transformer of arrester discharge counter, gather the charging operation signal of transformer and lightning arrester respectively, and output multichannel current sensing signal;
One comprises the I/V converting unit of micro current amplifier, and said I/V converting unit receives the multichannel current sensing signal of said current sensor unit, and the plurality of voltages signal after the conversion of I/V converting unit inserts follow-up signal filtering amplifying unit;
The one signal filtering amplifying unit that constitutes by filtering and amplifying circuit, the plurality of voltages signal that said signal filtering amplifying unit receives said I/V converting unit carries out filter amplifying processing, the output voltage signal of the high-frequency interferencing signal that is removed;
One includes the signal condition unit of raising level circuit, and said signal condition unit receives the output voltage signal of said signal filtering amplifying unit and raises, and obtains analog voltage signal;
One includes the A/D converting unit of multi-channel A/D conversion chip, and said A/D converting unit converts the analog voltage signal of said signal condition unit output into digital voltage signal;
One industrial computer unit comprises storage hard disk, communication module and CPU; Said industrial computer unit receives the digital voltage signal of said A/D converting unit through data line and analyzes; Obtain full current signal, harmonic signal, local discharge signal and the real component of lightning arrester respectively; And the ground current signal and the local discharge signal of transformer, and said each signal is transferred to display unit through data line show;
One keyboard unit is connected and controls sampling, data analysis and system's setting of said industrial computer unit through data line and said industrial computer unit.
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| CN2012101590153A CN102650669A (en) | 2012-05-21 | 2012-05-21 | Charged detection device of substation equipment |
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| CN102830319A (en) * | 2012-09-18 | 2012-12-19 | 辽宁省电力有限公司电力科学研究院 | Device and method for on-line inspection on insulation state of zinc oxide arrester |
| CN103018524A (en) * | 2012-11-30 | 2013-04-03 | 四川省电力公司内江电业局 | Electrification display detection device of high-voltage power system |
| CN103675615A (en) * | 2013-11-13 | 2014-03-26 | 国家电网公司 | Ultra-wideband detection device for realizing zinc oxide arrester partial discharge detection and method thereof |
| CN107807266A (en) * | 2017-10-31 | 2018-03-16 | 国家电网公司 | Leakage current of an arrester remote online monitoring system |
| CN111007435A (en) * | 2019-12-27 | 2020-04-14 | 广东电网有限责任公司电力科学研究院 | Monitoring method, device and equipment for analyzing transformer fault based on resistance-capacitance component |
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