CN204422640U - A kind of MOA lightning arrester current monitoring device - Google Patents
A kind of MOA lightning arrester current monitoring device Download PDFInfo
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- CN204422640U CN204422640U CN201420787800.8U CN201420787800U CN204422640U CN 204422640 U CN204422640 U CN 204422640U CN 201420787800 U CN201420787800 U CN 201420787800U CN 204422640 U CN204422640 U CN 204422640U
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Abstract
The utility model discloses a kind of MOA lightning arrester current monitoring device, comprise the current sensor, A/D convertor circuit, discharge circuit and the CPU main control unit that are connected to described MOA lightning arrester; Described current sensor is connected electrically to described A/D convertor circuit and discharge circuit respectively; Described A/D convertor circuit and discharge circuit are all connected electrically to described CPU main control unit; Described CPU main control unit is connected with communication module.A kind of MOA lightning arrester current monitoring device of this utility model, can aging, the internal wetted of Timeliness coverage MOA lightning arrester or the bad and radial electric discharge phenomena of insulating property, and can upload to backstage centralized management, and measurement result and up-delivering signal are stablized.
Description
Technical field
The utility model relates to transformer station's facilities and equipment field, is specifically related to a kind of MOA lightning arrester current monitoring device.
Background technology
Lightning arrester is a kind of important overvoltage protection of electric applicance, is responsible for the duplicate protection task of restriction lightning surge and switching overvoltage, and it normally runs and plays an important role to the guarantee safe operation of electrical equipment and the safe power supply of electric system.Take zinc paste as gapless Oxide Arrester (the Metal Oxide Surge Arrester of valve block raw material; be called for short MOA) there is superior protective value; and stable performance; ageing resistance is strong; severe contamination and the multiple special requirement such as high altitude localities and GIS can be adapted to, become the important overvoltage protective device of safe operation of power system.
MOA lightning arrester is in operation and there are following problems:
1, MOA lightning arrester is owing to eliminating series gap, bears system voltage for a long time, flows through electric current.Real component valve block heating in electric current, draw the change of volt-ampere characteristic, the result of long term can cause valve block aging, even thermal breakdown.
2, MOA lightning arrester is subject to the use of surge voltage, and valve block also can occur aging under the effect of surge voltage energy.
3, MOA lightning arrester internal wetted or insulating property bad, power current can be made to increase, power consumption aggravate, can internal discharge be caused time serious.
4, MOA lightning arrester is subject to the pollution of rain, snow, condensation or dust, issues different and makes to produce between inner valve block and outside insulator comparatively potential difference (PD), cause radial electric discharge phenomena to occur due to interior dispatch from foreign news agency.
In view of the problems referred to above that MOA lightning arrester exists; depend merely on annually preventive trial to find that the aging of MOA lightning arrester is inadequate; even if MOA lightning arrester qualified in prerun; be in operation and also punch through damage may occur; degradation situation under protection feature, this will produce extremely serious consequence.
For ensureing the safe operation of MOA lightning arrester, must monitor MOA lightning arrester.
At present, discharge current during leakage current, the thunderbolt of the technology of monitoring MOA lightning arrester mainly to MOA lightning arrester and discharging action number of times are monitored, and have following two kinds of methods:
1, be serially connected in MOA lightning arrester lower end with conventional counter and carry out measurement total current and action frequency, by reometer and counter dial display, without networking, without the measurement of current in resistance property, capacity current, discharge current, local can only show, backstage centralized management need not be uploaded.
2, based on the lightning arrester on-line monitoring of Optical Fiber Transmission, the total current (leakage current) that monitoring device for lightning arrester records by its principle of work is transformed into light pulse signal, carry out optical transport by optical fiber and be transformed into 485 buses by photoelectric transformer again, realize transporting function.This method solves the problem of data remote really, but in practical process, there is many problems, and some installations just cannot normally work less than half a year.Main cause be because in voltage-frequency circuit the capacitance of capacitor very easily influenced by ambient temperature, optical fiber easily to affect by extraneous factor and optical interface on monitor leaks relatively seriously, cause the instability of measurement result and remote transfer signal.
Therefore, on-line monitoring is carried out to MOA lightning arrester, can aging, the internal wetted of Timeliness coverage MOA lightning arrester or the bad and radial electric discharge phenomena of insulating property, and backstage centralized management can be uploaded to, measurement result and up-delivering signal are stablized, and are this area technical issues that need to address.
Utility model content
The technical problems to be solved in the utility model: on-line monitoring is carried out to MOA lightning arrester, can aging, the internal wetted of Timeliness coverage MOA lightning arrester or the bad and radial electric discharge phenomena of insulating property, and backstage centralized management can be uploaded to, measurement result and up-delivering signal are stablized.
For solving the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of MOA lightning arrester current monitoring device, comprises the current sensor, A/D convertor circuit, discharge circuit and the CPU main control unit that are connected to described MOA lightning arrester; Described current sensor is connected electrically to described A/D convertor circuit and discharge circuit respectively; Described A/D convertor circuit and discharge circuit are all connected electrically to described CPU main control unit; Described CPU main control unit is connected with communication module.
Preferably, described communication module is RS485 or CAN.
Preferably, described current sensor is Zero flux current sensor.
Preferably, described A/D convertor circuit is 24 AD circuit.
Pass through technique scheme, a kind of MOA lightning arrester current monitoring device that the utility model provides, comprise current sensor, A/D convertor circuit, discharge circuit and CPU main control unit, described current sensor is connected electrically to described A/D convertor circuit and discharge circuit respectively, described A/D convertor circuit and discharge circuit are all connected electrically to described CPU main control unit, and described CPU main control unit is connected with communication module.Current sensor detects MOA leakage current of an arrester signal in real time, by sending into CPU after AD circuit and discharge circuit process, the data of AD processing of circuit to CPU for measuring total current, then use the principle of third harmonic and unique compensation technique to calculate current in resistance property and capacity current, discharge circuit signal to CPU for recording discharging action number of times and measuring discharge current size.So just can go out the on-line operation state of MOA lightning arrester according to these inferred from input data, as aging, internal wetted or the situation such as insulating property are bad.Its beneficial effect is: can aging, the internal wetted of Timeliness coverage MOA lightning arrester or the bad and radial electric discharge phenomena of insulating property, and can upload to backstage centralized management, and measurement result and up-delivering signal are stablized.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of a kind of MOA lightning arrester current monitoring device disclosed in the utility model embodiment.
Numeral and the corresponding component title represented by letter in figure:
1. current sensor 2.AD change-over circuit 3. discharge circuit 4.CPU main control unit 5 communication module.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Principle of the present utility model is: current sensor detects MOA leakage current of an arrester signal in real time, by sending into CPU after AD circuit and discharge circuit process, the data of AD processing of circuit to CPU for measuring total current, then use the principle of third harmonic and unique compensation technique to calculate current in resistance property and capacity current, discharge circuit signal to CPU for recording discharging action number of times and measuring discharge current size.So just can go out the on-line operation state of MOA lightning arrester according to these inferred from input data, as aging, internal wetted or the situation such as insulating property are bad.
Embodiment:
As shown in Figure 1, a kind of MOA lightning arrester current monitoring device, comprises the current sensor 1, A/D convertor circuit 2, discharge circuit 3 and the CPU main control unit 4 that are connected to described MOA lightning arrester; Described current sensor 1 is connected electrically to described A/D convertor circuit 2 and discharge circuit 3 respectively; Described A/D convertor circuit 2 and discharge circuit 3 are all connected electrically to described CPU main control unit 4; Described CPU main control unit 4 is connected with communication module 5.
Current sensor detects MOA leakage current of an arrester signal in real time, rear feeding CPU main control unit 4 is processed by A/D convertor circuit 2 and discharge circuit 3, the data of A/D convertor circuit process are to CPU main control unit, for measuring total current, then use the principle of third harmonic and unique compensation technique to calculate current in resistance property and capacity current, discharge circuit signal to CPU main control unit for recording discharging action number of times and measuring discharge current size.So just can go out the on-line operation state of MOA lightning arrester according to these inferred from input data, as aging, internal wetted or the situation such as insulating property are bad.
A/D convertor circuit 2 is convert the simulating signal of current sensor to digital signal, is convenient to the process of CPU main control unit like this.
Discharge circuit 3 is for converting the electric current of current sensor to voltage, and when there being discharge current, in different size according to discharge current, the voltage signal being transferred to CPU is in different size, can measure the sizes values of each discharge current like this.And according to the size variation situation of voltage signal, also can discharge time be known.
Communication module 5 is that the data that CPU main control unit calculates are sent to backstage.
In the present embodiment, described communication module 5 is RS485 or CAN.RS485 is the interface of connected network communication between smart machine, can realize the connected network communication between multiple equipment.And CAN is more advanced than RS485, the interface of connected network communication with better function.These those skilled in the art can understand, and do not detail at this.
In the present embodiment, described current sensor 1 is Zero flux current sensor.Specifically be exactly active Zero flux punching mutual inductor.Zero flux current sensor is that measuring accuracy is high based on Hall effect principle, and those skilled in the art can understand, and does not detail.
In the present embodiment, described A/D convertor circuit 2 is 24 AD circuit.The AD circuit of 24, can provide the data of enough accuracy to CPU main control unit, make the better effects if of monitoring.
In the above-described embodiments, a kind of MOA lightning arrester current monitoring device that the utility model provides, comprise current sensor, A/D convertor circuit, discharge circuit and CPU main control unit, described current sensor is connected electrically to described A/D convertor circuit and discharge circuit respectively, described A/D convertor circuit and discharge circuit are all connected electrically to described CPU main control unit, and described CPU main control unit is connected with communication module.Current sensor detects MOA leakage current of an arrester signal in real time, by sending into CPU after AD circuit and discharge circuit process, the data of AD processing of circuit to CPU for measuring total current, then use the principle of third harmonic and unique compensation technique to calculate current in resistance property and capacity current, discharge circuit signal to CPU for recording discharging action number of times and measuring discharge current size.So just can go out the on-line operation state of MOA lightning arrester according to these inferred from input data, as aging, internal wetted or the situation such as insulating property are bad.Its beneficial effect is: carry out on-line monitoring to MOA lightning arrester, can aging, the internal wetted of Timeliness coverage MOA lightning arrester or the bad and radial electric discharge phenomena of insulating property, and can upload to backstage centralized management, and measurement result and up-delivering signal are stablized.
Above is only preferred implementation of the present utility model; it should be pointed out that for the person of ordinary skill of the art, under the prerequisite not departing from the utility model creation design; can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (4)
1. a MOA lightning arrester current monitoring device, is characterized in that, comprises the current sensor, A/D convertor circuit, discharge circuit and the CPU main control unit that are connected to described MOA lightning arrester; Described current sensor is connected electrically to described A/D convertor circuit and discharge circuit respectively; Described A/D convertor circuit and discharge circuit are all connected electrically to described CPU main control unit; Described CPU main control unit is connected with communication module.
2. a kind of MOA lightning arrester current monitoring device according to claim 1, it is characterized in that, described communication module is RS485 or CAN.
3. a kind of MOA lightning arrester current monitoring device according to claim 1, it is characterized in that, described current sensor is Zero flux current sensor.
4. a kind of MOA lightning arrester current monitoring device according to claim 3, is characterized in that, described A/D convertor circuit is 24 AD circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420787800.8U CN204422640U (en) | 2014-12-12 | 2014-12-12 | A kind of MOA lightning arrester current monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420787800.8U CN204422640U (en) | 2014-12-12 | 2014-12-12 | A kind of MOA lightning arrester current monitoring device |
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| CN204422640U true CN204422640U (en) | 2015-06-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567887A (en) * | 2021-08-10 | 2021-10-29 | 江苏久创电气科技有限公司 | Monitoring device for insulating equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567887A (en) * | 2021-08-10 | 2021-10-29 | 江苏久创电气科技有限公司 | Monitoring device for insulating equipment |
| CN113567887B (en) * | 2021-08-10 | 2024-04-09 | 江苏久创电气科技有限公司 | Monitoring device for insulating equipment |
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