CN203720239U - On-line monitor and online monitoring system of ultrahigh-voltage DC lightning arrester - Google Patents

On-line monitor and online monitoring system of ultrahigh-voltage DC lightning arrester Download PDF

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Publication number
CN203720239U
CN203720239U CN201420048786.XU CN201420048786U CN203720239U CN 203720239 U CN203720239 U CN 203720239U CN 201420048786 U CN201420048786 U CN 201420048786U CN 203720239 U CN203720239 U CN 203720239U
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CN
China
Prior art keywords
loop
counter
electrically
line monitoring
current
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Expired - Fee Related
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CN201420048786.XU
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Chinese (zh)
Inventor
牛文瑞
宋继军
千叶智基
李明刚
田宏伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ping Gao Toshiba (langfang) Lightning Arrester Co Ltd
PG Toshiba Langfang Arrester Co Ltd
Original Assignee
Ping Gao Toshiba (langfang) Lightning Arrester Co Ltd
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Priority to CN201420048786.XU priority Critical patent/CN203720239U/en
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Publication of CN203720239U publication Critical patent/CN203720239U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model relates to an on-line monitor and an online monitoring system of an ultrahigh-voltage DC lightning arrester. The on-line monitor comprises a resistance chip, a counter loop, a current measuring loop, a field counter, a field current meter and an electro-optical conversion loop, wherein one end of the resistance chip is connected with a high voltage, another end is grounded, an input end of the counter loop is connected with one end, connected with the high voltage, of the resistance chip, an output end of the counter loop is connected with an input end of the current measuring loop, an output end of the current measuring loop is connected with the grounded end of the resistance chip, the field counter and the electro-optical conversion loop are accessed into a counter measuring loop, the field counter and the electro-optical conversion loop are driven by the counter measuring loop, and the field current meter is accessed into the current measuring loop. The on-line monitor and the online monitoring system of the ultrahigh-voltage DC lightning arrester adopts a passive mode, and transmits lightning arrester action signals through an optical signal mode; and the action times and action time of the lightning arrester can be recorded through the judgment processing of the optical signals, and the magnitude of the impact current can be obtained accurately.

Description

A kind of on-line monitoring instrument and on-line monitoring system of UHVDC Arrester
Technical field
The utility model relates to UHVDC Arrester monitoring field, particularly a kind of on-line monitoring instrument and on-line monitoring system of UHVDC Arrester.
Background technology
Gapless metal-oxide lighting arrester is as one of important power equipment, internal resistance sheet directly bears voltage for a long time, run duration always has current flowing resistance sheet, if system exception, lightning arrester frequent movement, can cause that lightning arrester resistor disc is aging, Leakage Current increases and power consumption aggravation, cause lightning arrester resistor disc temperature to be increased to generation thermal runaway, thereby cause power system accident.In order to find in time the hidden danger of Oxide Arrester, need to understand its operation conditions, at present, the Main Means that metal oxide arrester running status is understood is on-line monitoring.
Domestic ac transmission is more now, the basic function of alternating current gapless metal oxide arrester on-line monitoring is to measure Leakage Current and the action frequency of lightning arrester, along with the development of electric system, the particularly rise of extra-high voltage direct-current transmission engineering, in order to increase the security performance in operational process, on-line monitoring for direct current metal Oxide Arrester is also even more important, and direct current metal Oxide Arrester is mainly reflected in the following aspects with the requirement of on-line monitoring:
1, require monitor can be operated in high-pressure side, and can be by lightning arrestor movement the signal is far passed to pulpit;
2, require monitor can on-the-spotly show lightning arrestor movement number of times and Leakage Current;
3, require the monitoring action frequency of lightning arrester and the size of action current;
The on-line monitoring of conventional lightning arrester cannot satisfied technical requirement mainly contain following several respects:
1, be applied to low pressure end, cannot be used for high-pressure side and carry out teletransmission monitoring;
2, can only monitor the action frequency of lightning arrester, the size of electric current when lightning arrestor movement can not be monitored.
In prior art, the normal resistor disc sampling theorem that adopts, realizes the monitoring of lightning arrestor movement number of times and Leakage Current, and adopts RS-485 mode to realize the teletransmission of data,
This kind of monitor existing problems:
1, monitor needs Power supply, and Power supply and RS-485 signal, by cable transfer, cannot be used for high-pressure side;
2, monitor cannot be realized the monitoring of arrester action current size;
Utility model content
Technical problem to be solved in the utility model is to provide and a kind ofly adopts passive mode, with light signal form transmission lightning arrestor movement signal and can accurately draw on-line monitoring instrument and the on-line monitoring system of the UHVDC Arrester of dash current size.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of on-line monitoring instrument of UHVDC Arrester, comprises resistor disc, counter loop, current measurement circuit, field enumeration device, on-the-spot reometer and electric light conversion loop;
One termination high pressure of described resistor disc, other end ground connection, the input end of described counter loop is electrically connected with one end that resistor disc connects high pressure, the output terminal of described counter loop is electrically connected with the input end of described current measurement circuit, the output terminal of described current measurement circuit is electrically connected with the earth terminal of described resistor disc, described field enumeration device is electrically connected with described counter loop, described electrical to optical converter is electrically connected with counter loop, and described on-the-spot reometer is electrically connected with described current measurement circuit.
The beneficial effects of the utility model are: adopt passive mode, carry out the transmission of lightning arrestor movement signal by mode optical signal; In monitor, field enumeration device is that electromagnetic mechanical type, on-the-spot reometer are that moving-coil type, electric light conversion are used passive device in loop, do not need power supply, realize the request for utilization for high-pressure side, and eliminate the various unstable hidden danger that needs power supply mode to bring, also reduced the cost that the realization of various power supply modes increases; Simulate arrester action current and electric current-time pulsewidth curve corresponding to output optical signal by test, by the monitoring judgement of signal processing module, can draw more accurately the action current size of lightning arrester; Adjustment for monitor lower limit action current is convenient, as long as by drawing the pulse width of the light signal that electric current is corresponding in electric current-pulsewidth curve, can process the criterion that the action using this pulse width as lightning arrester is rolled off the production line by follow-up signal.
On the basis of technique scheme, the utility model can also do following improvement.
Further, described on-the-spot reometer is the on-the-spot reometer of moving-coil type.
Further, described field enumeration device is electromagnetic mechanical type field enumeration device.
Further, the device in described electric light conversion loop is passive device.
Further, described resistor disc is non-linear metal oxide resistance.
Further, a kind of UHVDC Arrester on-line monitoring system of applying online monitor, comprises at least one monitor, optical fiber, at least one photoelectric commutator, signal processing module and protocol converter;
Each described monitor is electrically connected with a photoelectric commutator by optical fiber respectively, the output terminal of each described photoelectric commutator is all electrically connected with the signal input part of described signal processing module, the signal output part of described signal processing module is electrically connected with the input end of described protocol converter, and the output terminal of described protocol converter is connected with background control system.
Brief description of the drawings
Fig. 1 is the utility model on-line monitoring instrument circuit structured flowchart;
Fig. 2 is the utility model on-line monitoring system circuit structure block diagram.
In accompanying drawing, the list of parts of each label representative is as follows:
1, resistor disc, 2, counter loop, 3, current measurement circuit, 4, field enumeration device, 5, on-the-spot reometer, 6, electric light conversion loop, 7, monitor, 8, optical fiber, 9, photoelectric commutator, 10, signal processing module, 11, protocol converter, 12, background control system.
Embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, be the utility model on-line monitoring instrument circuit structured flowchart; Fig. 2 is the utility model on-line monitoring system circuit structure block diagram.
Embodiment 1
An online current monitoring instrument for UHVDC Arrester, comprises resistor disc 1, counter loop 2, current measurement circuit 3, field enumeration device 4, on-the-spot reometer 5 and electric light conversion loop 6;
One termination high pressure of described resistor disc 1, other end ground connection, the input end of described counter loop 2 is electrically connected with one end that resistor disc 1 connects high pressure, the output terminal of described counter loop 2 is electrically connected with the input end of described current measurement circuit 3, the output terminal of described current measurement circuit 3 is electrically connected with the earth terminal of described resistor disc 1, described field enumeration device 4 is electrically connected with described counter loop 2, described electrical to optical converter 6 is electrically connected with counter loop, and described on-the-spot reometer 5 is electrically connected with described current measurement circuit 3.
Described on-the-spot reometer 5 is the on-the-spot reometer of moving-coil type.Described field enumeration device 4 is electromagnetic mechanical type field enumeration device.Device in described electric light conversion loop 6 is passive device.
Described resistor disc 1 is non-linear metal oxide resistance.
Apply a UHVDC Arrester on-line monitoring system for online monitor, comprise at least one monitor 7, optical fiber 8, at least one photoelectric commutator 9, signal processing module 10 and protocol converter 11;
Each described monitor 7 is connected with a photoelectric commutator 9 by optical fiber 8 respectively, the output terminal of each described photoelectric commutator 9 is all connected with the signal input part of described signal processing module 10, the signal output part of described signal processing module 10 is connected with the input end of described protocol converter 11, and the output terminal of described protocol converter 11 is connected with background control system 12.
In concrete enforcement, on-line monitoring system of the present utility model comprises monitor, optical fiber, photoelectric commutator, signal processing module, 61850 protocol converters, and monitor comprises: resistor disc, counter loop, current measurement circuit, field enumeration device, on-the-spot reometer.
In the time that dash current passes through, electric current is mainly by resistor disc, and the pressure drop that resistor disc two ends produce drives field enumeration device and electrooptic conversion module simultaneously, when the action of field enumeration device, actuating signal is converted to light signal, and arrives signal processing module by Optical Fiber Transmission.Signal is processed judgement by signal processing module, gives background control system by final process result;
The voltage drop of resistor disc is determined by the size of dash current, and become positive correlation with dash current, the pressure drop that electrooptic conversion module output optical signal pulse width produces with resistor disc becomes positive correlation, thereby draw the magnitude relationship curve of output optical signal pulse width and dash current, can draw more accurately the size of dash current to the Treatment Analysis of light signal by processor, and result is passed to background control system, set monitor action lower current criterion, get final product the action frequency of bulk registration lightning arrester, and understand the size of current of the each action of lightning arrester,
In the time that the Leakage Current of lightning arrester passes through, electric current is mainly by counter measures loop and current measurement circuit, and current measurement circuit drives on-the-spot reometer to show the size of leakage current.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (6)

1. the on-line monitoring instrument of a UHVDC Arrester, it is characterized in that: comprise resistor disc (1), counter loop (2), current measurement circuit (3), field enumeration device (4), on-the-spot reometer (5) and electric light conversion loop (6);
One termination high pressure of described resistor disc (1), other end ground connection, the input end of described counter loop (2) is electrically connected with one end that resistor disc (1) connects high pressure, the output terminal of described counter loop (2) is electrically connected with the input end of described current measurement circuit (3), the output terminal of described current measurement circuit (3) is electrically connected with the earth terminal of described resistor disc (1), described field enumeration device (4) is electrically connected with described counter loop (2), described electrical to optical converter (6) is electrically connected with counter loop, described on-the-spot reometer (5) is electrically connected with described current measurement circuit (3).
2. on-line monitoring instrument according to claim 1, is characterized in that: described on-the-spot reometer (5) is the on-the-spot reometer of moving-coil type.
3. on-line monitoring instrument according to claim 1, is characterized in that: described field enumeration device (4) is electromagnetic mechanical type field enumeration device.
4. on-line monitoring instrument according to claim 1, is characterized in that: the device in described electric light conversion loop (6) is passive device.
5. according to the arbitrary described on-line monitoring instrument of claim 1 to 4, it is characterized in that: described resistor disc (1) is non-linear metal oxide resistance.
6. the UHVDC Arrester on-line monitoring system of the online monitor of application, it is characterized in that: comprise at least one monitor (7) as described in claim 1 to 5, optical fiber (8), at least one photoelectric commutator (9), signal processing module (10) and protocol converter (11);
Each described monitor (7) is connected with a photoelectric commutator (9) by optical fiber (8) respectively, the output terminal of each described photoelectric commutator (9) is all connected with the signal input part of described signal processing module (10), the signal output part of described signal processing module (10) is connected with the input end of described protocol converter (11), and the output terminal of described protocol converter (11) is connected with background control system (12).
CN201420048786.XU 2014-01-24 2014-01-24 On-line monitor and online monitoring system of ultrahigh-voltage DC lightning arrester Expired - Fee Related CN203720239U (en)

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CN201420048786.XU CN203720239U (en) 2014-01-24 2014-01-24 On-line monitor and online monitoring system of ultrahigh-voltage DC lightning arrester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420048786.XU CN203720239U (en) 2014-01-24 2014-01-24 On-line monitor and online monitoring system of ultrahigh-voltage DC lightning arrester

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698312A (en) * 2015-02-25 2015-06-10 中国南方电网有限责任公司超高压输电公司检修试验中心 System and method for electrically detecting DC arrester of DC converter station
CN104914317A (en) * 2015-05-12 2015-09-16 西安交通大学 Method used for measuring capacitance value of zinc oxide varistor applied to arrester

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698312A (en) * 2015-02-25 2015-06-10 中国南方电网有限责任公司超高压输电公司检修试验中心 System and method for electrically detecting DC arrester of DC converter station
CN104914317A (en) * 2015-05-12 2015-09-16 西安交通大学 Method used for measuring capacitance value of zinc oxide varistor applied to arrester
CN104914317B (en) * 2015-05-12 2017-08-15 西安交通大学 A kind of method for measuring arrester zinc oxide resistance sheet capacitance

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20140716

Termination date: 20180124