CN202854246U - Zinc oxide lightning arrester insulation state live detection device - Google Patents
Zinc oxide lightning arrester insulation state live detection device Download PDFInfo
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- CN202854246U CN202854246U CN201220477397.XU CN201220477397U CN202854246U CN 202854246 U CN202854246 U CN 202854246U CN 201220477397 U CN201220477397 U CN 201220477397U CN 202854246 U CN202854246 U CN 202854246U
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- lightning arrester
- zinc oxide
- insulation state
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- live detection
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Abstract
The utility model belongs to the technical field of lightning arrester insulation state live detection, and particularly relates to a zinc oxide lightning arrester insulation state live detection device. The device is a device for carrying out live detecting on the insulation state of a gapless metal zinc oxide lightning arrester, and a new method is disclosed. According to the device, a CPCI type structure is employed by a host machine case which is internally provided with a measurement connection cable, a signal conditioning circuit, a data acquisition and processing circuit and an industrial control computer, and each circuit is connected with a circuit board through a bottom end. The host machine case is provided with a touch display screen. According to the zinc oxide lightning arrester insulation state live detection device, the resistive current of a lightning arrester can be accurately and stably measured without leading a voltage transformer secondary signal, thus the state of the lightning arrester under operating voltage is effectively obtained, and the safe and stable operation of equipment is ensured.
Description
Technical field
The utility model belongs to the technical field of lightning arrester insulation state band electro-detection, relates in particular to a kind of zinc oxide lightning arrester insulation state measuring device with electricity, is a kind of to the device of gapless metal zinc oxide lightning arrester state of insulation with electro-detection.
Background technology
At present, in the every field such as transformer station and GIS, Zinc-Oxide Arrester has replaced traditional gapped lightning arrester of being with, and becomes the in the world main direction of lightning arrester development.The Zinc-Oxide Arrester resistor disc has very superior nonlinear characteristic.Under normal working voltage, its resistance is very high, in fact is equivalent to an insulator, therefore can come isolated working voltage without series gap; And under the superpotential effect, resistor disc resistance is very little, and residual voltage is very low.Under the normal working voltage, the electric current that flows through zinc oxide resistance sheet only is microampere order, but because valve block, resistor disc bear the power-frequency voltage effect for a long time produces deterioratedly, causes the variation of resistance characteristic, causes flowing through the leakage current increase of valve block.In addition, owing to lightning arrester dysplasia, poorly sealed internals and the valve block of making make moist, also can cause the increase of leakage current of an arrester in service.The rapid increase of resistive component in the leakage current can make the valve block temperature rise and thermal runaway occurs, and when serious, even causes the explosion accident of lightning arrester.
Power department generally adopts the method that detects zinc oxide lightning arrester block property current to diagnose its insulation status.Because the Zinc-Oxide Arrester valve block has very large specific inductive capacity, therefore, what flow through valve block under normal working voltage mainly is capacity current.The gordian technique that Zinc-Oxide Arrester detects is exactly how to isolate faint current in resistance property from capacity current is main total current.
At present, the detection method of arrester resistance current mainly contains two kinds: the first is the third harmonic method, namely by measuring the circuital third harmonic content of lightning arrester, triple harmonic current is thought current in resistance property.This method is owing to being subject to the impact of third harmonic content in the system voltage, and measuring accuracy is relatively poor, can't accurately reflect the current in resistance property of lightning arrester.The second is the angular difference method, namely carries out Fourier transform behind total current and the reference voltage and calculates phase angle by measuring, and can calculate current in resistance property by the phase angle difference of total current and system voltage.This method measuring accuracy is high, good stability, but reference voltage generally needs extraction voltage mutual inductor secondary singal, and outgoing cable not only operates comparatively loaded down with trivial details, in case and misoperation can cause the faults such as voltage transformer secondary voltage short circuit, affects the safe and stable operation of electric system.And other gets the method for reference voltage, and such as inductive method etc., it is larger that resulting voltage signal is affected by space electric field, and measuring accuracy is relatively poor.
In view of the limitation of present various measuring methods, be necessary to design the measuring device with electricity of a kind of lightning arrester total current and current in resistance property, both can be without extraction voltage mutual inductor secondary singal, acquisition lightning arrester operation conditions that again can be accurate, stable.
Summary of the invention
The utility model provides a kind of zinc oxide lightning arrester insulation state measuring device with electricity for above-mentioned problems of the prior art.Purpose is in the situation that do not need measurement lightning arrester total current and the current in resistance property of extraction voltage mutual inductor secondary singal accurate stable, thereby effectively obtains the state of insulation of lightning arrester under working voltage, guarantees the safe and stable operation of equipment.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of zinc oxide lightning arrester insulation state measuring device with electricity, adopt CPCI formula structure at mainframe box, be provided with in the mainframe box and measure connection cable, signal conditioning circuit, data acquisition and treatment circuit, industrial control computer, the each several part circuit connects by the bottom connecting circuit board; Housing is provided with touching display screen.
The utlity model has following innovative point:
(1) need not to take the voltage transformer secondary signal, draw the resistive electricity of lightning arrester by relative angular difference method
Stream.
(2) one groups of three-phase lightning protector synchro measures, real-time is high, is easy to on-the-spot installing and using.
(3) directly connect lightning arrester by measuring cable, need not the punching sensor, be easy to on-the-spot installing and using.
(4) adopt Anti-interference Design, be applicable to the rugged surroundings of transformer station's highfield, high-intensity magnetic field.
(5) have local storage and warning function, make things convenient for testing crew record data and judgment device operation shape
Attitude.
(6) the CPCI formula structure cabinet of adopting international standards, easy to use, expansion and safeguarding.
(7) adopt touch LCD screen, friendly interface, easy to operate, be easy to use.
(8) industrial computer that gathers in the control module adopts Windows XP system, is easy to store data derivation and the Function Extension of data, different-format.
(9) according to many data experience and site testing data assert that B phase angle value is 85 °, by A phase, the C phase lightning arrester angular difference with B phase lightning arrester, calculate the current in resistance property of A, C two-phase.Long-term by this method detection arrester resistance current, can react the operation conditions of lightning arrester.
Advantage of the present utility model and effect are:
Through the retrieval proof, have no at present the application report that directly detects the lightning arrester operation conditions by the full current signal of one group of three-phase oxidation zinc of synchro measure lightning arrester.Enforcement by technical solutions of the utility model, can be in the situation that do not need the measurement arrester resistance current of extraction voltage mutual inductor secondary singal accurate stable, thereby effectively obtain the state of lightning arrester under working voltage, guarantee the safe and stable operation of equipment.
Description of drawings
Below in conjunction with specific embodiment of the utility model and accompanying drawing, the utility model is described in detail.
Fig. 1 is detection method field wiring schematic diagram of the present utility model;
Fig. 2 is detection method Algorithm Analysis polar plot of the present utility model;
Fig. 3 is the utility model structural representation.
Among the figure: power module 1, signal processing unit 2 gathers control module 3, touch-screen display 4.
Embodiment
Embodiment 1:
The utility model is a kind of zinc oxide lightning arrester insulation state measuring device with electricity, and as shown in Figure 3, pick-up unit comprises that measuring connection cable is power module 1, signal processing unit 2, gathers the parts such as control module 3 and touch-screen display 4.Mainframe box adopts CPCI formula structure, is provided with in the mainframe box and measures connection cable, signal conditioning circuit, data acquisition and treatment circuit, industrial control computer, and the each several part circuit connects by the bottom connecting circuit board; Mainframe box is provided with touching display screen 4.
The utility model is by measuring the current in resistance property parameter of lightning arrester, judging the running status of lightning arrester.The utility model needs the full current signal of one group of three-phase oxidation zinc of synchro measure lightning arrester, calculates amplitude and the phasing degree of three-phase lightning protector current signal.The current in resistance property angle (and angle of B phase voltage signal and full current signal) of assert B phase lightning arrester is 85 °, according to the relation of 120 ° of three-phase voltage phase phasic differences, calculated the current in resistance property angle of A phase and C phase by the circuital phasing degree of the three-phase lightning protector that obtains value.By the three-phase lightning protector total current that draws and current in resistance property angle, according to formula
Calculate the current in resistance property value.Respectively organize for a long time the current in resistance property of lightning arrester by this measurement device, the current in resistance property fluctuation single-phase such as A phase or C phase lightning arrester is larger, thinks that then there are defective in A phase or C phase lightning arrester; If it is larger that A phase and C phase arrester resistance current fluctuate simultaneously, think that then there is defective in B phase lightning arrester.
The designed device of the utility model is obtained the lightning arrester full current signal by the measurement cable that is connected to the counter of lightning arrester two ends.The total current of one group of three-phase lightning protector of device synchro measure is processed by data acquisition and data, calculates total current and the current in resistance property value of lightning arrester.Device has lcd touch panel type display 4, and in real time display measurement value, and per 3 seconds is upgraded current measurement value one time.Measurement result can be preserved, and the user can check by touch-screen display 4 historical data information of equipment.When measurement result during significantly greater than the historical data value, device can send warning message, and may there be the insulation degradation problem in this group lightning arrester of reminding user.
The wiring diagram that the utility model is used at the scene as shown in Figure 1.The total current of one group of three-phase lightning protector of this device synchronized sampling calculates the amplitude I of three-phase current by Fourier Transform Algorithm
a, I
b, I
c, and vector phase a
a, a
b, a
cAssert I
bWith U
bAngle
Then the position relationship by each vector shown in Figure 2 can draw:
Embodiment 2:
2011,2 groups of the 500kV of this transformer station lightning arresters have been detected in Hunhe transformer station with device.Wherein the current in resistance property angle numerical value of one group of lightning arrester is as shown in table 1:
As can be seen from Table 1, this device detects this group arrester resistance current angular data with the front conventional test of electro-detection data and a week and compares, and every phase has all reduced 1 °.Measuring error is because this device has assert that B phase current in resistance property angle is 85 ° and causes, and measuring accuracy is all identical with conventional test data before the week with trend.Although what the method obtained is not the actual value of arrester resistance current, but detect arrester resistance current with this device for a long time, can obtain accurately the variation tendency of arrester resistance current actual value, can reflect the running status of lightning arrester, meet on-the-spot testing requirements.
Table 1 is the current in resistance property angle numerical value of one group of lightning arrester wherein
| Separate | This method measurement data | Conventional test data before one week |
| A | 83° | 84° |
| B | 85° | 86° |
| C | 86° | 87° |
Claims (1)
1. zinc oxide lightning arrester insulation state measuring device with electricity, it is characterized in that: adopt CPCI formula structure at mainframe box, be provided with in the mainframe box and measure connection cable, signal conditioning circuit, data acquisition and treatment circuit, industrial control computer, the each several part circuit connects by the bottom connecting circuit board; Housing is provided with touching display screen (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220477397.XU CN202854246U (en) | 2012-09-18 | 2012-09-18 | Zinc oxide lightning arrester insulation state live detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220477397.XU CN202854246U (en) | 2012-09-18 | 2012-09-18 | Zinc oxide lightning arrester insulation state live detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202854246U true CN202854246U (en) | 2013-04-03 |
Family
ID=47985429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220477397.XU Expired - Lifetime CN202854246U (en) | 2012-09-18 | 2012-09-18 | Zinc oxide lightning arrester insulation state live detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202854246U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2012
- 2012-09-18 CN CN201220477397.XU patent/CN202854246U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102830319B (en) * | 2012-09-18 | 2016-02-24 | 辽宁省电力有限公司电力科学研究院 | A kind of zinc oxide lightning arrester insulation state measuring device with electricity and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130403 |