CN208013311U - A kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method - Google Patents
A kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method Download PDFInfo
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- CN208013311U CN208013311U CN201820355042.0U CN201820355042U CN208013311U CN 208013311 U CN208013311 U CN 208013311U CN 201820355042 U CN201820355042 U CN 201820355042U CN 208013311 U CN208013311 U CN 208013311U
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Abstract
The utility model provides a kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method, which includes tested three-phase lightning protector, variable frequency signal source, high pressure PT, light current current transformer, the anti-interference frequency-selecting measuring device of high-precision strong, alternating current 220V power supplys, grounded screen, connecting line.For measuring the Coupling Between Phases capacitance of A, B phase arrester, alternating current 220V power supplys are connected to variable frequency signal source to system power supply;The output of variable frequency signal source is connected to the low-voltage terminal of high pressure PT;The High voltage output of high pressure PT is connected to the upper end of B phase arresters, the earthing of casing of high pressure PT;A, B phases arrester upper end is hanging, and B phase arresters lower end is directly grounded, and A arresters lower end is also directly grounded, and a light current current transformer is accessed on its ground wire;The output of light current current transformer is connected to the current measurement terminal of the anti-interference frequency-selecting measuring device of high-precision strong, the non-power-frequency current of A phases is measured, the output of variable frequency signal source is connected to the voltage measurement terminal of the anti-interference frequency-selecting measuring device of high-precision strong simultaneously, the no-load voltage ratio that high pressure PT is set in the anti-interference frequency-selecting measuring device of high-precision strong, can calculate the Coupling Between Phases capacitance of A, B phase arrester automatically.
Description
Technical field
The utility model is related to the technical fields of measurement, alternate more particularly, to a kind of arrester based on alien frequencies method
Coupled capacitor tests system.
Background technology
The test method capacitive current compensation method for accounting for mainstream in lightning arrester live-line test at present does not take PT because of security reason
Secondary singal, or transfer that station is taken to become reference voltage, bring larger original reason error, and live interphase interference and instrument etc.
Reason cannot accurately measure current in resistance property value, or even the problem of erroneous judgement, fail to judge occurs, and affect live testing technology to keeping away
The validity of thunder device defect diagonsis.
Capacitive current compensation method is method the most ripe in principle in current lightning arrester live-line test, by taking system electric
It presses signal as benchmark, the capacitive part in total current is compensated, obtain the current in resistance property of reflection arrester active loss
Component.
But three-phase lightning protector is all "-" type installation at the scene, due to Coupling Between Phases capacitance and electromagnetic interference, is made each
Phase arrester is also acted on by Coupling Between Phases by adjacent phase voltage, in addition to being acted on by this phase voltage to influence to monitor
As a result accuracy.
Site layout project mode brings lightning arrester live-line test the influence of interphase interference, although the instrument of existing maturation is equal
There is alternate compensation function, but effect is undesirable in practical application.Existing lightning arrester live-line test method can not obtain resistive electricity
The exact value of stream, the result of live testing do not pursue the accuracy of test data, and the validity of live testing is mainly reflected in
The lateral comparison of test data, occurring the arrester deteriorated individually can find to come out in lateral comparison, it is difficult to criticizing
Secondary property, familial defect arrester state are reflected, and are difficult to find arrester early defect.
Live testing the case where there is also erroneous judgements, in Practical on-site test, there is also live testings to pinpoint the problems, and
Situation without exception is tested after power failure.
Currently, live testing instrument manufacturer is numerous, test philosophy, anti-interference ability are different, and the equipment quality good and the bad is not
Together, in practice usually can not usage history data carry out longitudinal comparison, the trend of arrester deterioration is difficult to from historical data
It reflects.On April 25th, 2013, the Shantou 500kV station 500kV Shans banyan A-wire arrester are afterwards, right because lightning stroke is broken down
The reason of DC experiment test for perfecting phase arrester, as a result shows that leakage current is exceeded, confirms that resistor disc deteriorates, failure is point
Deteriorating under the accumulation impact for bearing multiple lightning stroke occurs in analysis resistor disc, accelerated deterioration, and occurs under subsequent working voltage
Thermal runaway.Nearly 3 years live testing data of the arrester are transferred, find the leakage current of an arrester resistive component in 2011
It is slightly increased in test process, maximum amplification is the 3.2% of A phases.The new arrester band electrical measurement for purchasing strong antijamming capability in 2012
Test instrument, leakage current of an arrester resistive component decline to a great extent, and the maximum range of decrease is the 36.2% of A phases, and test result is qualified, electrification
Test result is because of different instruments, and there are certain deviations, are not effectively reflected arrester resistor disc degradation trend, most
Arrester internal flaw could not be effectively checked eventually, so that accident occurs.
Arrester test site complex environment, the problem of also bringing live high interference.Test data is easy by ring
The influence of temperature, humidity, rainfall, arrester contamination degree of surface of electric, the electromagnetic environment in border etc., causes the inaccuracy of data.
Another current problem is safety problem.There are inconvenience and safety hidden when taking voltage transformer signal at the scene
Suffer from：1. operations staff is needed to coordinate access voltage transformer signal, there are maloperation risks；2. needing additionally to increase isolation dress
It sets, prevents signal in instrument from sealing in voltage transformer；3. there is short-circuit risks for voltage transformer signal.Safety, letter are not met
Just the technological development direction of lightning arrester live-line test.
Since existing lightning arrester live-line test technology is there are disadvantages mentioned above, live testing data validity is deposited at present
In deficiency.
Invention content
The utility model is at least one defect overcome described in the above-mentioned prior art, provides a kind of keeping away based on alien frequencies method
Thunder device Coupling Between Phases capacitor test system, effectively avoids the Hz noise at scene, and can guarantee the equivalence with power frequency.
The technical solution of the utility model is：A kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method, packet
Include tested three-phase lightning protector, variable frequency signal source, high pressure PT, light current current transformer, the anti-interference frequency-selecting measuring device of high-precision strong, city
Electric 220V power supplys, grounded screen, connecting line；
For measuring the Coupling Between Phases capacitance of A, B phase arrester, alternating current 220V power supplys are connected to variable frequency signal source to being
System power supply;The output of variable frequency signal source is connected to the low-voltage terminal of high pressure PT;The High voltage output of high pressure PT is connected to B phase arresters
Upper end, the earthing of casing of high pressure PT;A, B phases arrester upper end is hanging, and B phase arresters lower end is directly grounded, A arresters lower end
Also it is directly grounded, and accesses a light current current transformer on its ground wire;The output of light current current transformer is connected to high-precision strong
The current measurement terminal of anti-interference frequency-selecting measuring device, measures the non-power-frequency current of A phases, while by the defeated of variable frequency signal source
The voltage measurement terminal for going out to be connected to the anti-interference frequency-selecting measuring device of high-precision strong, in the anti-interference frequency-selecting measuring device of high-precision strong
On set the no-load voltage ratio of high pressure PT, the Coupling Between Phases capacitance of A, B phase arrester can be calculated automatically.
Further, the three-phase lightning protector is the arrester without electricity operation.
Further, the variable-frequency power sources output frequency is 40~70Hz.
Further, the voltage class of the high pressure PT is determined according to the voltage class of tested arrester, high pressure PT's
High voltage output voltage is being tested the 50%~100% of arrester rated voltage.
The anti-interference frequency-selecting measuring device of high-precision strong can be in thousand times of Hz noises to lower alien frequencies voltage and current signal standard
Really measure.
Compared with prior art, advantageous effect is：（1）It is measured, can effectively be avoided existing using 40-70Hz alien frequencies methods
The Hz noise of field, and can guarantee the equivalence with power frequency.（2）Strong antijamming capability, can be in the power current of thousand times of thousand times
The vector of faint alien frequencies is accurately measured under interference.（3）Intelligence degree is high.Can automatic switching range, can save as a result, can lead
Go out test waveform, is very beneficial for further technology analysis.
Description of the drawings
Fig. 1 is the utility model overall schematic.
Specific implementation mode
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；It is attached in order to more preferably illustrate the present embodiment
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of position relationship described in attached drawing
Illustrate, should not be understood as the limitation to this patent.
Fig. 1 show a kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method, which includes tested three
Phase arrester, variable frequency signal source, high pressure PT, light current current transformer, the anti-interference frequency-selecting measuring device of high-precision strong, alternating current 220V electricity
Source, grounded screen, connecting line.
For measuring the Coupling Between Phases capacitance of A, B phase arrester, alternating current 220V power supplys are connected to variable frequency signal source to being
System power supply;The output of variable frequency signal source is connected to the low-voltage terminal of high pressure PT;The High voltage output of high pressure PT is connected to B phase arresters
Upper end, the earthing of casing of high pressure PT;A, B phases arrester upper end is hanging, and B phase arresters lower end is directly grounded, A arresters lower end
Also it is directly grounded, and accesses a light current current transformer on its ground wire;The output of light current current transformer is connected to high-precision strong
The current measurement terminal of anti-interference frequency-selecting measuring device, measures the non-power-frequency current of A phases, while by the defeated of variable frequency signal source
The voltage measurement terminal for going out to be connected to the anti-interference frequency-selecting measuring device of high-precision strong, in the anti-interference frequency-selecting measuring device of high-precision strong
On set the no-load voltage ratio of high pressure PT, the Coupling Between Phases capacitance of A, B phase arrester can be calculated automatically.
The system is tested using alien frequencies method, since the electromagnetic environment of test site is extremely complex, especially power frequency magnetic
Interference especially severe, the alien frequencies method in the system tested using frequency different from power frequency but close to the signal of power frequency,
The method is come Hz noise and measured signal segregation with non-50 Hz experiment power supplies, avoids its caused measurement error, simultaneously also
It can guarantee the equivalence with power frequency.
It must be the arrester not run that has a power failure that arrester is tested in the system, need to be to tested arrester pressurization, it is necessary to stop
The arrester that electricity is not run could be realized.
Variable-frequency power sources output frequency in the system is 40~70Hz
Mutual inductor in the system uses light current current transformer, since the Coupling Between Phases electric current in arrester is all microampere order
, it requires the current transformer of sampling that can accurately sample the signal of microampere order in this way, the precondition accurately measured is provided.
The voltage class of high pressure PT in the present invention is determined according to tested arrester rated voltage, is typically chosen in tested keep away
The 50%~100% of thunder device rated voltage.
The anti-interference frequency-selecting measuring device of high-precision strong can accurately measure faint different under thousands of times of interference in the system
Frequency current signal.
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
It is exhaustive.All any modification, equivalent and improvement made within the spirit and principle of the present invention etc., should be included in
Within the protection domain of the utility model claims.
Claims (3)
1. a kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method, which is characterized in that lightning-arrest including tested three-phase
Device, variable frequency signal source, high pressure PT, light current current transformer, the anti-interference frequency-selecting measuring device of high-precision strong, alternating current 220V power supplys connect
Earth mat, connecting line；
Alternating current 220V power supplys are connected to variable frequency signal source to system power supply;The output of variable frequency signal source is connected to the low pressure of high pressure PT
Terminal;The High voltage output of high pressure PT is connected to the upper end of B phase arresters, the earthing of casing of high pressure PT;A, B phases arrester upper end is outstanding
Sky, B phase arresters lower end are directly grounded, and A arresters lower end is also directly grounded, and a weak current mutual inductance is accessed on its ground wire
Device;The output of light current current transformer is connected to the current measurement terminal of the anti-interference frequency-selecting measuring device of high-precision strong, frequency variation signal
The output in source is connected to the voltage measurement terminal of the anti-interference frequency-selecting measuring device of high-precision strong.
2. a kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method according to claim 1, feature exist
In：The three-phase lightning protector is the arrester without electricity operation.
3. a kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method according to claim 1, feature exist
In：The voltage class of the high pressure PT determines that the High voltage output voltage of high pressure PT exists according to the voltage class of tested arrester
The 50%~100% of tested arrester rated voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820355042.0U CN208013311U (en) | 2018-03-15 | 2018-03-15 | A kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820355042.0U CN208013311U (en) | 2018-03-15 | 2018-03-15 | A kind of arrester Coupling Between Phases capacitor test system based on alien frequencies method |
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| CN208013311U true CN208013311U (en) | 2018-10-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534007A (en) * | 2021-07-28 | 2021-10-22 | 广东电网有限责任公司 | Lightning arrester leakage current monitoring method and system |
-
2018
- 2018-03-15 CN CN201820355042.0U patent/CN208013311U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534007A (en) * | 2021-07-28 | 2021-10-22 | 广东电网有限责任公司 | Lightning arrester leakage current monitoring method and system |
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