CN202025054U - Portable creepage current electrified detecting system for support insulator - Google Patents

Portable creepage current electrified detecting system for support insulator Download PDF

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Publication number
CN202025054U
CN202025054U CN2011200357716U CN201120035771U CN202025054U CN 202025054 U CN202025054 U CN 202025054U CN 2011200357716 U CN2011200357716 U CN 2011200357716U CN 201120035771 U CN201120035771 U CN 201120035771U CN 202025054 U CN202025054 U CN 202025054U
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input
support insulator
data acquisition
current
leakage current
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Expired - Fee Related
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CN2011200357716U
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刘志学
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刘志学
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Abstract

The utility model discloses a portable creepage current electrified detecting system for a support insulator. The system comprises a first input end and a second input end, the first input end is connected with a current sensor, the current sensor is connected with a double-throw switch, two contacts of the double-throw switch are connected with the second input end through resistors with different intensity, the current sensor is connected with a data acquisition module, and the data acquisition module is connected with a microcomputer processing module and a power module through data buses respectively. By adopting the system to carry out electrified measurement to the creepage current of the support insulator, the only requirement is to connect the first input end of the system to an optional point above a framework and connect the second input end to an optional point below a framework. When the electrified checkout to a milli-ampere-meter of a lightning arrester detector is needed, the only requirement is to connect the first input end of the system to the upper end of the detector and connect the second input end to the lower end of the detector, and the checkout can be completed during the running process of the lightning arrester detector.

Description

The charged detection system of a kind of portable support insulator leakage current
Technical field
The utility model relates to a kind of insulator leakage current detection system, the charged detection system of particularly a kind of portable support insulator leakage current.
Background technology
Support insulator is subjected to the influence of factors such as filthy icing, high temperature humidity, dynamo-electric load for a long time in outdoor operation, decreasing insulating may occur, can dodge the Lip river breakdown accident when serious, threatens power supply reliability.It is the non electrical quantity detection of representative that support insulator detection at present has with ultraviolet imagery, ultrasound examination, observation, detect two big classes with the electric weight that with leakage current detection, electric field measurement, insulation measurement is representative, wherein the leakage current detection is important support insulator detection method, by can judge the pollution level of insulator to the analysis of leakage current, for the pollution flashover early warning provides foundation.As can be seen, live line measurement support insulator leakage current is necessary.
Two kinds of methods are adopted in the live line measurement of support insulator leakage current at present usually:
1. adopt the non-contact current sensor of Luo-coil formation.Its shortcoming: operation maintenance is comparatively complicated.
2. between insulator and ground, seal in current sensor.Its shortcoming: change original loop, and Unit Installation and the maintenance processing that all need have a power failure.
Lightning arrester monitor is used to monitor leakage current of an arrester and action frequency, it can regard a milliammeter that has superpotential action tally function as, its type generally has three kinds: measure effective value, mean value, peak value, its milliammeter electric current indication and equivalent internal resistance may change in operational process: if table meter bite, can cause indication unusual, influence operations staff's judgement; If the loose contact of table meter lead-in wire, the contact portion corrosion causes transition resistance to increase, and not only can make the electric current indication less than normal, and unobstructed the impacting in cascading water loop can be to superpotential the time.As can be seen, the indication of the internal resistance of charged verification lightning arrester monitor milliammeter and electric current is necessary.
Whether present technology only can check the lightning arrester monitor milliammeter to indicate whether correctly usually, can not check the internal resistance of lightning arrester monitor milliammeter normal.
The utility model content
At above-mentioned the deficiencies in the prior art, the technical problems to be solved in the utility model provides a kind of charged detection that can be used for the support insulator leakage current, also can be used for the system of the charged verification of lightning arrester monitor milliammeter.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
The charged detection system of a kind of portable support insulator leakage current, it comprises the first input end and second input end, described first input end is connected with current sensor, described current sensor is connected with a double throw switch, two contacts of described double throw switch are connected with described second input end by two resistance that vary in size respectively, described current sensor is connected with data acquisition module, and described data acquisition module is connected with MICROCOMPUTER PROCESSING module and power module respectively by data bus.
Preferably, described data acquisition module also is connected with a man-machine conversation module by data bus.
Preferably, described data acquisition module also is connected with communication module by data bus.
Preferably, described data acquisition module also is connected with a temperature transmitter by data bus.
Preferably, described data acquisition module also is connected with a humidity transmitter by data bus.
Technique scheme has following beneficial effect: native system is very easy to use, in the time of need carrying out the live line measurement of support insulator leakage current, only need the first input end of this system is connected to arbitrfary point, framework top, second input end is connected to frame underneath (as the ground connection band iron) more arbitrarily, do not need to destroy original loop like this, and when equipment is charged, can conveniently install, be convenient to realize portable.When need carry out the charged verification of lightning arrester monitor milliammeter, only need the first input end of this system is connected to the monitor upper end, second input end is connected to the monitor lower end, can realize verification when lightning arrester monitor moves.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the structural representation of the utility model during to the live line measurement of support insulator leakage current.
Fig. 3 is the structural representation of the utility model during to the charged verification of lightning arrester monitor milliammeter.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described in detail.
As shown in Figure 1, the charged detection system of this portable support insulator leakage current comprises the first input end and second input end, first input end is connected with current sensor 1, current sensor 1 is connected with a double throw switch S, two contacts of double throw switch S are connected with second input end with Ry by two resistance R x that vary in size respectively, current sensor 1 is connected with data acquisition module 2, data acquisition module 2 by the BUS data bus respectively with MICROCOMPUTER PROCESSING module 4, communication module 3, man-machine conversation module 5, power module 6, temperature transmitter 8 is connected with humidity transmitter 7.
Switch S is that a pair of is put switch, and it is by data acquisition module 2 controls, and cycle of electric system is 0.02 (s), if during t=a (s), system starts working, and then S places on the contact of resistance R x one side the current i that current sensor 1 measuring resistance Rx flows through during a≤t<0.02+a x, switch S places on the contact of resistance R y one side the current i that current sensor 1 measuring resistance Ry flows through when 0.02+a≤t<0.04+a y, the effect of current sensor 1 is the current i that measuring resistance Rx and resistance R y flow through xAnd i y
Data acquisition module 2 realizes that by microcomputer device its effect is the current i that collection resistance R x and resistance R y flow through xAnd i y, and they are deposited in the storage element of MICROCOMPUTER PROCESSING module 4.If data acquisition module 2 sample frequency are f s, when then S placed on the contact of resistance R x one side, data acquisition module can be gathered 0.02f sIndividual i xDiscrete value, data acquisition module can be gathered 0.02f when S placed on the contact of resistance R y one side sIndividual i yDiscrete value.
The effect of MICROCOMPUTER PROCESSING module 4 has three:
Effect 1: according to the 0.02f of data collecting module collected sIndividual i xDiscrete value and 0.02f sIndividual i yDiscrete value, calculate the 0.02f of the leakage current i of support insulator or lightning arrester by formula sIndividual discrete value, the discrete value computing formula is.
i * ( a + k × T s ) = i x * ( a + k × T s ) i y * ( a + k T s + N T s ) ( R y - R x ) i y * ( a + k T s + N T s ) ( R y + r s ) - i x * ( a + k × T s ) ( R x + r s )
(this formula is used to calculate support insulator leakage current discrete value)
(i *Be support insulator leakage current discrete value, Rx and Ry are two known resistance, i x *For resistance R x flows through electric current discrete value, i y *For resistance R y flows through the electric current discrete value, a is for sampling the zero hour, and Ts is the inverse of sample frequency fs, N equals 0.02fs, rs is the current sensor equivalent internal resistance, if K is taken to N-1 successively from 0, and whole 0.02fs discrete magnitude in just can supported insulator leakage current one-period)
i * ( a + k × T s ) = i x * ( a + k × T s ) i y * ( a + k T s + N T s ) ( R y - R x ) i y * ( a + k T s + N T s ) ( R y + r ′ s ) - i x * ( a + k × T s ) ( R x + r ′ s )
(this formula is used to calculate the leakage current of an arrester discrete value)
(i *Be the leakage current of an arrester discrete value, Rx and Ry are two known resistance, i x *For resistance R x flows through electric current discrete value, i y *For resistance R y flows through the electric current discrete value, a is for sampling the zero hour, and Ts is the inverse of sample frequency fs, N equals 0.02fs, r ' s is the current sensor equivalent internal resistance, if K is taken to N-1 successively from 0, just can obtain whole 0.02fs discrete magnitude in the leakage current of an arrester one-period)
Effect 2: according to the i of data collecting module collected xDiscrete value and i yDiscrete value, calculate lightning arrester milliammeter internal resistance value by formula, computing formula is:
r s = i y * ( a + k T s + N T s ) ( R y + r ′ s ) - i x * ( a + k × T s ) ( R x + r ′ s ) i x * ( a + k × T s ) - i y * ( a + k T s + N T s )
(Rx and Ry are two known resistance, i x *For resistance R x flows through electric current discrete value, i y *For resistance R y flows through the electric current discrete value, a is sampling zero hour, and Ts is the inverse of sample frequency fs, and N equals 0.02fs, and r ' s is the current sensor equivalent internal resistance, and K can be taken to N-1 successively from 0, no matter k gets what value, the r that tries to achieve sConstant)
Effect 3: according to the 0.02f of the leakage current i of support insulator and lightning arrester sIndividual discrete value obtains leakage current eigenwert (peak value, mean value, effective value), each harmonic component by corresponding calculating (as full Fourier transform and associated quad computing).
Man-machine conversation module 5 comprises display screen and button, its effect is to select corresponding function by button, thereby the waveform, the eigenwert (peak value that show the leakage current of support insulator and lightning arrester, mean value, effective value), the humiture of each harmonic component, the internal resistance of lightning arrester monitor milliammeter, site environment.The effect of communication module 3 is the mode of related data by wired (as cable) or wireless (as bluetooth, microwave) to be reached a distant place when installing for a long time.The effect of temperature transmitter 8 is to measure ambient temperature.The effect of humidity transmitter 7 is to measure ambient humidity.The effect of power module 3 is to power to system by wired mode (as cable) or wireless mode (as sun power).
As shown in Figure 2, when this detection system 10 need be carried out support insulator 11 leakage current live line measurements, only need the first input end of this system is connected to arbitrfary point, conductor 12 top, second input end is connected to conductor 12 belows (as the ground connection band iron) more arbitrarily, do not need to destroy original loop like this, and when equipment is charged, can conveniently install, be convenient to realize portable.The resistance that a point is ordered to b in the Rab presentation graphs among the figure, the resistance that the b point is ordered to o in the Rbo presentation graphs.Because leakage current is by equipment voltage and the decision of insulator equiva lent impedance, so S places any contact that current i is not influenced, if the data acquisition module sample frequency is f s, adopt number N=0.02f in the cycle s, current sensor 1 internal resistance is r s, K is the natural number less than N, it is as follows then can to get electric current discrete magnitude equation:
i * ( a + k × T s ) = i x * ( a + k × T s ) ( R b 0 R bo + R x + r x ) - - - ( 1 )
i * ( a + kT s + NT s ) = i y * ( a + k T s + NT s ) ( R bo R bo + R y + r s ) - - - ( 2 )
Because
i *(a+k×T s)=i *(a+kT s+NT s) (3)
So solve by 1,2 formulas:
i * ( a + k × T s ) =
i x * ( a + k × T s ) i y * ( a + k T s + N T s ) ( R y - R x ) i y * ( a + k T s + N T s ) ( R y + r s ) - i x * ( a + k × T s ) ( R x + r s ) - - - ( 4 )
(4) be the discrete magnitude expression of support insulator leakage current, when being taken to N-1 successively from 0, K just can obtain whole N discrete magnitudes in the one-period, detection system can " described point " be drawn current waveform, and can obtain leakage current eigenwert and each secondary frequency components by correlation computations and full Fourier Tranform, according to nyquist sampling theorem as can be known, if sample frequency is fs, then sampled value can reappear the following radio-frequency component of fs/2, and the electronic installation sample frequency order of magnitude is generally greater than 10 at present 3, if consider that with fs=2KHZ then native system can reappear following harmonic component 20 times, satisfies requirement of engineering.
As shown in Figure 3, when this detection system 10 is carried out the charged verification of lightning arrester monitor milliammeter, first input end is connected to monitor milliammeter 9 upper ends, second input end is connected to monitor milliammeter 9 lower ends.The impedance that the c point is ordered to a in the Zca presentation graphs among the figure, the impedance that a point is ordered to d in the Zad presentation graphs, the resistance that the d point is ordered to o in the Rdo presentation graphs.
Native system is installed in the monitor two ends, is not difficult to analyze and finds out that current i is almost constant before and after check system is installed among the lead ab, and establishing the current sensor internal resistance is r ' s, the monitor internal resistance is r s, by the analysis of similar above, can get:
r s =
i y * ( a + k T s + N T s ) ( R y + r ′ s ) - i x * ( a + k × T s ) ( R x + r ′ s ) i x * ( a + k × T s ) - i y * ( a + k T s + N T s )
(5)
i * ( a + k × T s ) =
i x * ( a + k × T s ) i y * ( a + k T s + N T s ) ( R y - R x ) i y * ( a + k T s + N T s ) ( R y + r ′ s ) - i x * ( a + k × T s ) ( R x + r ′ s )
(6)
(5) no matter k gets what value, r in the formula sConstant, (6) formula gained is the electric current discrete value, calculates by the whole discrete values of one-period and can get it to effective value, mean value or peak value, so that verification.
More than the charged detection system of a kind of portable support insulator leakage current that the utility model embodiment is provided be described in detail; for one of ordinary skill in the art; thought according to the utility model embodiment; part in specific embodiments and applications all can change; in sum; this description should not be construed as restriction of the present utility model, and all any changes of being made according to the utility model design philosophy are all within protection domain of the present utility model.

Claims (5)

1. charged detection system of portable support insulator leakage current, it is characterized in that: it comprises the first input end and second input end, described first input end is connected with current sensor, described current sensor is connected with a double throw switch, two contacts of described double throw switch are connected with described second input end by two resistance that vary in size respectively, described current sensor is connected with data acquisition module, and described data acquisition module is connected with MICROCOMPUTER PROCESSING module and power module respectively by data bus.
2. the charged detection system of portable support insulator leakage current according to claim 1 is characterized in that: described data acquisition module also is connected with a man-machine conversation module by data bus.
3. the charged detection system of portable support insulator leakage current according to claim 1, it is characterized in that: described data acquisition module also is connected with communication module by data bus.
4. the charged detection system of portable support insulator leakage current according to claim 1, it is characterized in that: described data acquisition module also is connected with a temperature transmitter by data bus.
5. the charged detection system of portable support insulator leakage current according to claim 1, it is characterized in that: described data acquisition module also is connected with a humidity transmitter by data bus.
CN2011200357716U 2011-02-10 2011-02-10 Portable creepage current electrified detecting system for support insulator Expired - Fee Related CN202025054U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103033702A (en) * 2012-12-03 2013-04-10 桂林赛普电子科技有限公司 Multi-functional handheld tester of lighting protection device
CN103439367A (en) * 2013-09-04 2013-12-11 国家电网公司 Composite insulator string live detection equipment
CN103675434A (en) * 2013-12-12 2014-03-26 国家电网公司 System and method for early warning insulator pollution flashover
CN103809047A (en) * 2012-11-09 2014-05-21 河南省电力公司焦作供电公司 Centralized electric appliance monitoring device
CN105158630A (en) * 2015-09-02 2015-12-16 国家电网公司 System for testing and taking leakage current of tested piece directly and conveniently

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103809047A (en) * 2012-11-09 2014-05-21 河南省电力公司焦作供电公司 Centralized electric appliance monitoring device
CN103033702A (en) * 2012-12-03 2013-04-10 桂林赛普电子科技有限公司 Multi-functional handheld tester of lighting protection device
CN103033702B (en) * 2012-12-03 2015-10-28 桂林赛普电子科技有限公司 Multifunctional hand-held lightning arrester tester
CN103439367A (en) * 2013-09-04 2013-12-11 国家电网公司 Composite insulator string live detection equipment
CN103675434A (en) * 2013-12-12 2014-03-26 国家电网公司 System and method for early warning insulator pollution flashover
CN105158630A (en) * 2015-09-02 2015-12-16 国家电网公司 System for testing and taking leakage current of tested piece directly and conveniently
CN105158630B (en) * 2015-09-02 2019-01-04 国家电网公司 A kind of system for measuring test product leakage current of direct convenience

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Granted publication date: 20111102

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