CN105606951A - Method and device for measuring polarity of capacitor voltage transformer by using self-excitation method - Google Patents
Method and device for measuring polarity of capacitor voltage transformer by using self-excitation method Download PDFInfo
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- CN105606951A CN105606951A CN201510843677.6A CN201510843677A CN105606951A CN 105606951 A CN105606951 A CN 105606951A CN 201510843677 A CN201510843677 A CN 201510843677A CN 105606951 A CN105606951 A CN 105606951A
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Abstract
The embodiment of the invention discloses a method and device for measuring the polarity of a capacitor voltage transformer by using a self-excitation method. The device is used for measuring the capacitor voltage transformer. The device includes a direct-current voltage generation device and a pointer type voltage meter, wherein, the direct-current voltage generation device is connected in parallel with the secondary side of the capacitor voltage transformer, and the pointer type voltage meter is connected in parallel with the primary side of the capacitor voltage transformer. The method includes the following steps that: the direct-current voltage generation device is controlled to be switched on, and a test channel is controlled to be switched on for the measurement of the polarity of the capacitor voltage transformer; when the direct-current voltage generation device is switched on, the deviation direction of the pointer of the pointer type voltage meter is observed and recorded; and the polarity of the capacitor voltage transformer is judged according to the deviation direction of the pointer of the pointer type voltage meter. The method and device provided by the invention have the advantages of operational simplicity, safety, reliability, high economical efficiency and operational performance.
Description
Technical field
The present invention relates to high voltage electric power equip ment detection technique field, particularly relate to a kind of self-excitation method measurement capacitor voltage mutualThe method of sensor polarity and device.
Background technology
Capacitance type potential transformer is a kind of very important high-tension power transmission and transformation equipment, is mainly used as voltage measurement and relay and protectsThe voltage signal sampler protecting, its secondary voltage signal is the important criterion of electric power system fault. In engineering debug to electricityThe verification of appearance formula voltage transformer does not have method accurately and effectively, causes transformer station to put into operation in process, easily occurs that voltage is mutualThe problems such as sensor secondary connection mistake or reversal connection, cause the relay protection can not the correct decision system failure. Therefore, in handing-overAnd should carry out polarity test before and after overhaul, in case polarity is mistaken in the time of wiring, cause relay protection malfunction and metering notCorrectly.
Testing the polarity chron of electromagnetic potential transformer in the past, can and link straight between transformer primary side lead-in wire and groundGalvanic battery, at a needle dc voltmeter of secondary side access in parallel, by accessing and disconnecting dc source, observes secondary sideThe yawing moment of pointer gauge pointer, just can judge the correctness of polarity. For capacitance type potential transformer, electric capacity toolHave longer charge and discharge process, the capacity of dc-battery is substantially negligible for dividing potential drop electric capacity. At primary sideAccess dc-battery cannot observe the deflection of pointer at all at secondary side, traditional polarity test method lost efficacy.
Comparatively general method is to adopt PT (PotentialTransformer, voltage transformer) characteristic test at presentInstrument carries out polarity test to capacitance type potential transformer. But this tester is very heavy, its test connection is alsoHeavy thick copper lines, carrying and commutation are very inconvenient. And PT characteristic tester there is no special polarity test menu, and this is establishedAfter standby each startup, all will the parameters of PT all be tested according to set model own, the testing time is long. Voltage is mutualSensor has multiple windings conventionally, and every mutually each winding all needs to carry out polarity test, and therefore the time of waste can not ignore.The polarity chron of checking and accepting, need especially the multiple capacitance type potential transformers of test at new website, the shortcoming of PT characteristic tester is further prominentAobvious, a large amount of working times and physical all being expended in handling process. In addition, PT characteristic tester cost is highExpensive, economy is not high.
Summary of the invention
The method and the device that in the embodiment of the present invention, provide a kind of self-excitation method to measure capacitance type potential transformer polarity, to separateCertainly in prior art, cannot directly test for the polarity of capacitance type potential transformer, cause in test process and expend greatlyThe extra time of amount and the problem of energy.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
First aspect, the device that the embodiment of the present invention provides a kind of self-excitation method to measure capacitance type potential transformer polarity, instituteState device for measuring capacitance type potential transformer, comprise DC voltage generating means and needle dc voltmeter, wherein, instituteThe secondary side of stating DC voltage generating means and described capacitance type potential transformer is connected in parallel, described needle dc voltmeter withDescribed capacitance type potential transformer primary side is connected in parallel;
One group of Secondary Winding coil terminals of the positive pole of described DC voltage generating means and described capacitance type potential transformerPolar end electrical connection, one group of secondary of the negative pole of described DC voltage generating means and described capacitance type potential transformer aroundThe non-polar end electrical connection of group coil terminals;
The positive pole of described needle dc voltmeter is electrically connected with the primary side intermediate voltage terminal of described capacitance type potential transformer,The negative pole of described needle dc voltmeter is electrically connected with the primary side low-voltage terminal of described capacitance type potential transformer.
Preferably, described DC voltage generating means comprises 1.5V dc-battery.
Preferably, described device also comprises gauge tap, and described gauge tap and described direct current generating means are connected in series.
On the other hand, a kind of method that the present invention also provides self-excitation method to measure capacitance type potential transformer polarity, comprise withLower step:
Control DC voltage generating means and connect, connect TCH test channel for measuring capacitance type potential transformer polarity;
Connect moment at described DC voltage generating means, observe the also throw of pointer direction of record pointer formula voltmeter;
Judge the polarity of described capacitance type potential transformer according to the throw of pointer direction of described needle dc voltmeter.
Preferably, the described throw of pointer direction according to described needle dc voltmeter judges described capacitance type potential transformerPolarity, comprising:
If the pointer positive deflection of described needle dc voltmeter, judges described capacitance type potential transformer first and second sideSub-polarity is correct;
If the pointer attonity of described needle dc voltmeter or oppositely deflection, judge described capacitance type potential transformer one,Secondary side terminal polarity is incorrect.
From above technical scheme, the self-excitation method that the embodiment of the present invention provides is measured the device of capacitance type potential transformer,Comprise capacitance type potential transformer, DC voltage generating means and needle dc voltmeter, wherein, DC voltage generating meansBe connected in parallel with the secondary side of capacitance type potential transformer, needle dc voltmeter is in parallel with capacitance type potential transformer primary sideConnect; One group of Secondary Winding coil terminals polar end electricity of the positive pole of DC voltage generating means and capacitance type potential transformerConnect one group of Secondary Winding coil terminals non-polar end of the negative pole of DC voltage generating means and capacitance type potential transformerElectrical connection; The positive pole of needle dc voltmeter is electrically connected with the primary side intermediate voltage terminal of capacitance type potential transformer, pointerThe negative pole of formula voltmeter is electrically connected with the primary side low-voltage terminal of capacitance type potential transformer.
The method that the self-excitation method that the embodiment of the present invention provides is measured capacitance type potential transformer comprises the following steps: control direct currentVoltage generation circuit is connected, and connects TCH test channel for measuring capacitance type potential transformer polarity; Occur at described DC voltageDevice is connected moment, observes the throw of pointer direction of needle dc voltmeter; Utilize the throw of pointer of described needle dc voltmeterDirection judges the polarity of capacitance type potential transformer.
The required testing tool of device that the self-excitation method that the embodiment of the present invention provides is measured capacitance type potential transformer is simple, carriesConvenient. When test, only need to prepare a joint 1.5V dc-battery, a needle dc voltmeter, some test leads,Small investment, economic benefit are high. Meanwhile, the method for self-excitation method measurement capacitance type potential transformer is simple to operate, safe and reliable,Pass through theory analysis and facts have proved, not having the anti-risk of boosting of voltage transformer secondary. The required testing tool of the methodSimply, small investment and easily carrying, easy to operate and time saving and energy saving, there is very high economy and operability, canGreatly improve relay protection staff's operating efficiency, there is larger engineering practical value, be worth net on a large scalePromote.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existingIn technical description, the accompanying drawing of required use is briefly described, apparently, for those of ordinary skill in the art andSpeech, is not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of self-excitation method that Fig. 1 provides for the embodiment of the present invention is measured the apparatus structure signal of capacitance type potential transformer polarityFigure;
The device that Fig. 2 measures capacitance type potential transformer polarity for a kind of self-excitation method that the embodiment of the present invention provides is at EMTDCIn model;
Capacitance type potential transformer secondary side injected pulse voltage wave in the EMTDC model that Fig. 3 provides for the embodiment of the present inventionShape figure;
The capacitance type potential transformer primary side output voltage waveforms in EMTDC model that Fig. 4 provides for the embodiment of the present inventionFigure.
In Fig. 1-and Fig. 4, symbol represents:
1-capacitance type potential transformer, 2-DC voltage generating means, 3-gauge tap, 4-needle dc voltmeter, 11-Primary side intermediate voltage terminal, 12-primary side binding post, 13-capacitive divider, 14-intermediate voltage transformer, 15-Secondary Winding coil terminals, 16-primary side low-voltage terminal.
Detailed description of the invention
In order to make those skilled in the art person understand better the technical scheme in the present invention, below in conjunction with the invention processAccompanying drawing in example, is clearly and completely described the technical scheme in the embodiment of the present invention, obviously, and described realityExecuting example is only the present invention's part embodiment, instead of whole embodiment. Based on the embodiment in the present invention, abilityTerritory those of ordinary skill is not being made the every other embodiment obtaining under creative work prerequisite, all should belong to thisThe scope of invention protection.
Referring to Fig. 1, a kind of self-excitation method providing for the embodiment of the present invention is measured the device knot of capacitance type potential transformer polarityStructure schematic diagram, described device is used for measuring capacitance type potential transformer 1, wherein, described capacitance type potential transformer 1The high pressure of primary side system is first by capacitive divider 13 dividing potential drops, then by intermediate voltage transformer 14, medium voltage is becomeSecondary voltage, in the compensation reactor in intermediate voltage transformer 14 and transformer leakage reactance sum and capacitive divider 13The equivalent capacitive reactance formation series resonance of dividing potential drop electric capacity can be eliminated secondary load and change the impact bringing, and can keep voltage stabilization.Described capacitive divider 13 is held and is composed in series by a joint or a few economize on electricity, and primary side binding post 12 is at capacitive divider 13Top.
In Fig. 1, winding intermediate voltage terminal in the time that user needs by this terminal joint porcelain from capacitive divider 13Wall is drawn, the primary side intermediate voltage terminal 11 of the capacitance type potential transformer 1 of combined type single-column structure and primary side low pressureTerminal 16 is to be drawn out in calutron with intermediate voltage transformer 14 by the little insulator in next economize on electricity vessel bottom headEarth terminal on high-pressure side and outlet board is connected.
This device comprises DC voltage generating means 2 and needle dc voltmeter 4, DC voltage generating means 2 in the present inventionAdopt dc-battery, dc-battery volume is little, and quality is light, carries with easy to use, and the dc-battery of employing dischargesVoltage range be 1V-3V, the dc-battery voltage adopting in the embodiment of the present invention is 1.5V. The pointer voltage adoptingTable 4 is electromagnetic type pointer voltmeter, by observing the swing situation of pointer, judges the utmost point of capacitance type potential transformer 1Property, intuitively efficient. In device, also comprise gauge tap 3, described gauge tap 3 is connected with described direct current generating means and is connectedConnect, be used for controlling the break-make of battery.
In the embodiment of the present invention, self-excitation method is measured in the device of capacitance type potential transformer polarity, and described DC voltage occursDevice 2 is connected in parallel with the secondary side of described capacitance type potential transformer 1, described needle dc voltmeter 4 and described electric capacityThe primary side of formula voltage transformer 1 is connected in parallel.
One group of Secondary Winding coil-end of the positive pole of described DC voltage generating means 2 and described capacitance type potential transformer 1The polar end electrical connection of son 15, one of the negative pole of described DC voltage generating means 2 and described capacitance type potential transformer 1The non-polar end electrical connection of group Secondary Winding coil terminals 15.
The primary side intermediate voltage terminal 11 of the positive pole of described needle dc voltmeter 4 and described capacitance type potential transformer 1Electrical connection, the primary side low-voltage terminal 16 of the negative pole of described needle dc voltmeter 4 and described capacitance type potential transformer 1Electrical connection.
It is corresponding with the device embodiment that above-mentioned a kind of self-excitation method provided by the invention is measured capacitance type potential transformer polarity,The present invention also provides a kind of self-excitation method to measure the method for capacitance type potential transformer polarity, comprises the following steps:
Step S101: control respectively DC voltage generating means 2 and connect, for measuring capacitance type potential transformer 1 polarity connectionLogical TCH test channel;
Step S102: connect moment at DC voltage generating means 2, the pointer of observation record pointer formula voltmeter 4 is inclined to one sideVeer;
Step S103: the polarity that judges capacitance type potential transformer 1 according to the throw of pointer direction of needle dc voltmeter 4.
This step also comprises: if the pointer positive deflection of described needle dc voltmeter 4 judges capacitance type potential transformer1 first and second side terminal polarity is correct; If the pointer attonity of described needle dc voltmeter 4 or oppositely deflection, judgementCapacitance type potential transformer 1 first and second side terminal polarity is incorrect.
Self-excitation method is to utilize battery to apply DC voltage at capacitance type potential transformer secondary side, at capacitance type potential transformerNeedle dc voltmeter 4 in parallel between 1 primary side intermediate voltage terminal 11 and primary side low-voltage terminal 16, is connecting direct currentThe moment of battery is observed the deflection of needle dc voltmeter that primary side connects 4, thereby judges polarity correctness. The method profitWith the secondary of capacitance type potential transformer 1 intermediate voltage transformer 14 own to the characteristic of boosting once, micro-secondary sideWeak DC voltage amplifies, and at primary side intermediate voltage terminal 11 place's access needle dc voltmeters 4, has avoided capacitive dividerHigh-voltage capacitance in 13. At this, survey with the polarity of the laln winding in the Secondary Winding coil terminals 15 shown in Fig. 1Examination is for example, at laln winding two ends and link the dc-battery of a 1.5V, primary side intermediate voltage terminal 11 and oneBetween inferior side low-voltage terminal 16 and link needle dc voltmeter 4.
For a long time, thereby need prevent from causing the anti-high pressure that send of primary side at the secondary side making alive of capacitance type potential transformer 1,This viewpoint is deep-rooted already in the heart relay protection staff, therefore never someone whether thought can be mutual at capacitor voltageThe secondary side of sensor 1 adds DC voltage and tests polarity. And a kind of self-excitation method proposing in the present invention is measured capacitor voltageThe method of mutual inductor polarity has been put into secondary side DC voltage generating means 2 just.
By theory analysis and practice, a kind of self-excitation method in the embodiment of the present invention is measured to capacitance type potential transformer polarityMethod correctness prove.
Build EMTDC (ElectricMagneticTransientof according to the parameter of capacitance type potential transformer 1DirectCurrent, electro-magnetic transient simulation program) model, as Fig. 3, the EMTDC that Fig. 3 provides for the embodiment of the present inventionCapacitance type potential transformer secondary side injected pulse voltage waveform image in model, at the secondary of capacitance type potential transformer 1Side is utilized the pulse voltage of the quick-speed turning on-off analog input of switch, and input pulse voltage is 1.5V. Referring to Fig. 4, Fig. 4 isThe primary side output voltage waveform picture of capacitance type potential transformer 1 in EMTDC model that the embodiment of the present invention provides,When input pulse voltage is 1.5V, the voltage wave of the primary side output of capacitance type potential transformer 1,, the about 0.1kV of peak value.A kind of self-excitation method that the proof employing embodiment of the present invention provides is measured the method for capacitance type potential transformer polarity, can't produceThe anti-phenomenon of boosting of raw secondary side, can to capacitance type potential transformer 1 or whole circuit damage.
In the new website checking and accepting of the 220kV of Guangzhou power supply administration Chinese field, a kind of self-excitation method in the embodiment of the present invention is measured to electricityThe method of appearance formula TV transformer polarity is tested.
The 220kV capacitance type potential transformer 1 that Chinese field new website adopts, the high-voltage capacitance rated value in capacitive divider 13 is0.01187 μ F, it is 0.06351 μ F that middle piezoelectricity holds rated value, therefore can calculate wherein between the no-load voltage ratio of transformer be about364:1. Add at secondary the power frequency ac voltage that a peak value is 1.5V, the voltage measuring at intermediate voltage terminal place should be386V (virtual value). Thereby capacitance type potential transformer 1 is to utilize alternating magnetic field that primary coil produces in iron core inferiorLevel coil-induced go out secondary voltage, therefore do not change DC voltage. In the time utilizing self-excitation method to carry out polarity test, secondaryThe added alternating voltage of side is to form by artificial connecting and disconnecting dc-battery, is only switching on and off momentCan form voltage at primary side, this voltage, by the voltage producing much smaller than the power frequency ac voltage of 1.5V, can lead to completelyCross access needle dc voltmeter 4 and measure, while utilizing needle dc voltmeter 4 to measure, the deflection maximum of pointer existsBetween 40V-100V, do not exceed 100V, illustrate and there is in practice very high security and practical value.
The present invention proposes a kind of method of self-excitation method measurement capacitance type potential transformer polarity, further by EMTDC emulationVerify the feasibility of the method. In the new website checking and accepting of the 220kV of Guangzhou power supply administration Chinese field, the method is triedTest and succeed, having proved security and the practical value of this method. Finally in the capacitance type potential transformer polarity examination of full stationIn testing, adopt the method, saved a large amount of reception times, proved the efficient and practicality of the method from engineering practice.
It should be noted that, in this article, the relational terms such as " once " and " secondary " etc. be only used for byEntity or operation and another entity or operating space separate, and not necessarily require or imply these entities or behaviourBetween work, there is relation or the order of any this reality. And term " comprises ", " comprising " or it is anyOther variants are intended to contain comprising of nonexcludability, thus make to comprise a series of key elements process, method, article orEquipment not only comprises those key elements, but also comprises other key elements of clearly not listing, or is also included as this mistakeThe key element that journey, method, article or equipment are intrinsic. In the situation that there is no more restrictions, " comprise one by statementIndividual ... " key element that limits, and be also not precluded within process, method, article or the equipment that comprises described key element and existOther identical element.
The above is only the specific embodiment of the present invention, makes those skilled in the art can understand or realize the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiment, as defined herein oneAs principle can be in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, thisBrightly will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of noveltyThe widest consistent scope.
Claims (5)
1. self-excitation method is measured a device for capacitance type potential transformer polarity, and it is mutual that described device is used for measuring capacitor voltageSensor (1), is characterized in that, comprises DC voltage generating means (2) and needle dc voltmeter (4), wherein, described inDC voltage generating means (2) is connected in parallel with the secondary side of described capacitance type potential transformer (1), described pointer-typeVoltmeter (4) is connected in parallel with described capacitance type potential transformer (1) primary side;
One group of Secondary Winding of the positive pole of described DC voltage generating means (2) and described capacitance type potential transformer (1)The polar end electrical connection of coil terminals (15), the negative pole of described DC voltage generating means (2) and described capacitor voltageThe non-polar end electrical connection of one group of Secondary Winding coil terminals (15) of transformer (1);
The primary side medium voltage end of the positive pole of described needle dc voltmeter (4) and described capacitance type potential transformer (1)Son (11) electrical connection, the negative pole of described needle dc voltmeter (4) and described capacitance type potential transformer (1) are onceSide low-voltage terminal (16) electrical connection.
2. self-excitation method according to claim 1 is measured the device of capacitance type potential transformer polarity, it is characterized in that,Described DC voltage generating means (2) comprises 1.5V dc-battery.
3. self-excitation method according to claim 1 is measured the device of capacitance type potential transformer polarity, it is characterized in that,Described device also comprises gauge tap (3), and described gauge tap (3) is connected with described DC voltage generating means (2)Connect.
4. self-excitation method is measured a method for capacitance type potential transformer polarity, it is characterized in that, described method comprises followingStep:
Control DC voltage generating means (2) and connect, for the polarity of measuring capacitance type potential transformer (1) is connected testPassage;
Connect moment at described DC voltage generating means (2), the pointer of observation record pointer formula voltmeter (4) is inclined to one sideVeer;
Judge the utmost point of described capacitance type potential transformer (1) according to the throw of pointer direction of described needle dc voltmeter (4)Property.
5. self-excitation method according to claim 4 is measured the method for capacitance type potential transformer polarity, it is characterized in that,The described throw of pointer direction according to described needle dc voltmeter (4) judges the utmost point of described capacitance type potential transformer (1)Property, comprising:
If the pointer positive deflection of described needle dc voltmeter (4), judges described capacitance type potential transformer (1)First and second side terminal polarity is correct;
If the pointer attonity of described needle dc voltmeter (4) or oppositely deflection, judge described capacitance type potential transformer(1) first and second side terminal polarity is incorrect.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510843677.6A CN105606951A (en) | 2015-11-27 | 2015-11-27 | Method and device for measuring polarity of capacitor voltage transformer by using self-excitation method |
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| CN201510843677.6A CN105606951A (en) | 2015-11-27 | 2015-11-27 | Method and device for measuring polarity of capacitor voltage transformer by using self-excitation method |
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Cited By (6)
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| CN107369544A (en) * | 2017-09-04 | 2017-11-21 | 云南电网有限责任公司电力科学研究院 | A kind of GIS formulas of band electromagnetic shielding are from the standard potential transformer that boosts |
| CN108169575A (en) * | 2018-01-16 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | The test device and method of a kind of CVT capacitances dielectric loss and capacitance |
| CN110488068A (en) * | 2019-08-07 | 2019-11-22 | 国网河北省电力有限公司 | A kind of sampling unit on capacitance type potential transformer |
| CN110531214A (en) * | 2019-08-28 | 2019-12-03 | 中广核工程有限公司 | For detecting the detection verification method of Secondary Circuit of Potential Transformer winding short circuit |
| CN111751766A (en) * | 2020-06-28 | 2020-10-09 | 深圳供电局有限公司 | Main transformer bushing current transformer polarity detection method |
| CN115389984A (en) * | 2022-08-15 | 2022-11-25 | 国网天津市电力公司 | Mutual inductor polarity identification device and identification method based on non-oscillation over-damping characteristic |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107369544A (en) * | 2017-09-04 | 2017-11-21 | 云南电网有限责任公司电力科学研究院 | A kind of GIS formulas of band electromagnetic shielding are from the standard potential transformer that boosts |
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| CN108169575A (en) * | 2018-01-16 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | The test device and method of a kind of CVT capacitances dielectric loss and capacitance |
| CN108169575B (en) * | 2018-01-16 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Method for testing dielectric loss and capacitance of CVT capacitor |
| CN110488068A (en) * | 2019-08-07 | 2019-11-22 | 国网河北省电力有限公司 | A kind of sampling unit on capacitance type potential transformer |
| CN110531214A (en) * | 2019-08-28 | 2019-12-03 | 中广核工程有限公司 | For detecting the detection verification method of Secondary Circuit of Potential Transformer winding short circuit |
| CN110531214B (en) * | 2019-08-28 | 2022-06-07 | 中广核工程有限公司 | Detection and verification method for detecting short circuit of secondary circuit winding of voltage transformer |
| CN111751766A (en) * | 2020-06-28 | 2020-10-09 | 深圳供电局有限公司 | Main transformer bushing current transformer polarity detection method |
| CN115389984A (en) * | 2022-08-15 | 2022-11-25 | 国网天津市电力公司 | Mutual inductor polarity identification device and identification method based on non-oscillation over-damping characteristic |
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Application publication date: 20160525 |