CN208172234U - A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig - Google Patents
A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig Download PDFInfo
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- CN208172234U CN208172234U CN201820873885.XU CN201820873885U CN208172234U CN 208172234 U CN208172234 U CN 208172234U CN 201820873885 U CN201820873885 U CN 201820873885U CN 208172234 U CN208172234 U CN 208172234U
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Abstract
The utility model relates to electrically detect test field, no-load voltage ratio, the Check up polarity experimental rig of a kind of current transformer are disclosed, including：Relay-protection tester 1,1 piece of Digital Phase VA Meter with Two Current Sensor, test wire and crocodile clip; wherein; the relay-protection tester is used to provide the electric current I1 of input first winding; current output terminal Ia is connect with crocodile clip with the end L1 of current transformer first winding to be measured by test wire, and current output terminal In is connect with crocodile clip with the end L2 of current transformer first winding to be measured by test wire；The utility model both ensure that accuracy, detection experiment work efficiency is improved again, wiring is simple, it is easy to operate, according to its application principle, the method achieve in the case where no-load voltage ratio, polar synchronization detection test i.e. any additional work amount of no increase and any instrument and meter, no-load voltage ratio, Check up polarity test are synchronously completed.
Description
Technical field
The utility model relates to electrically detect test field more particularly to a kind of no-load voltage ratio of current transformer, Check up polarity
Experimental rig.
Background technique
The top priority of high voltage electric equipment is safely and reliably to power, any fault outage, and it is raw all to influence industrial or agricultural
The normal transport order of production and railway, causes huge loss to national economy.Current transformer (CT) is that electric system is important
Electrical equipment, the function that it carries isolation between high and low pressure system and high pressure amount is converted to low pressure amount.Its wiring is just
Whether really, there is extremely important meaning to the normal work of the equipment such as the protection, measurement, monitoring of system.So electrical equipment is examined
Test, which is tested, to be very necessary, and the no-load voltage ratio of current transformer and polarity surely belong to the most important thing.
Wherein, the purpose of current transformer polarity test is in order to ensure power component, impedor and differential protection
Correctness, it is such as incorrect, it will to make the tool for accessing the circuit directive instrument instruction mistake, and make directionality relay
Ineffective or even malfunction is protected, therefore copes with polarity and goes through, it is necessary to ensure that is accurate.Detection test is exactly according to journey
Sequence determines the activity of electrical equipment characteristic, and the purpose that current transformer ratio, Check up polarity are tested is whether to meet design requirement,
And should be consistent with nameplate and mark, in the prior art, there are many method and apparatus to carry out no-load voltage ratio, Check up polarity test, such as：
1, current transformer conventional polar is tested, as shown in Figure 1, PV is milivoltmeter in figure；S is chopper switch；TA is quilt
Try current transformer；DC is DC power supply.Judgment method is when chopper switch connects moment, if observation millivolt list index positively biased
(to right avertence), then L1、K1For homopolar end, subject current transformer is subtractive polarity；If pointer is reverse-biased, L1、K1For heteropolarity
End, subject current transformer are additive polarity.
The advantages of this method is that required instrument and meter is easy to carry.But it has the disadvantage that：
If ordinary straight galvanic electricity pointer gauge is selected in the test of current transformer conventional polar, the displacement very little of swing is not easy to observe,
Easily erroneous judgement.Especially when the control of drawing period of switching time is improper, switch, which is closed and switched, pulls open the true of the meter beat of pointer
Direction is not easy to see clearly.
2, current transformer ratio detection test, as shown in Fig. 2, i is current source, practical application includes 1 pressure regulator, 1
Platform current lifting device；A1Primary current for ammeter, for measurement current transform er；A2For ammeter, it to be used for measurement current transform er
Secondary current.The advantages of this method is：It is readily appreciated that, and has obtained widely universal.But it has the disadvantage that：
Current transformer ratio detection test can be with the increase of power system capacity, and current transformer primary current is increasingly
Greatly, the huge and heavy test for making scene of testing equipment is more and more difficult, and detection test efficiency is low.
3, using mutual inductor characteristic integrated tester, an instrument can complete the mutual inductors such as polarity, no-load voltage ratio, excitation property
Attribute testing project, disadvantage predominantly use mutual inductor characteristic integrated tester, and examination is detected in high voltage alive equipment region
When testing, electromagnetic interference is serious, and it is too big to generate error to its analog quantity calculated result；It is inconvenient to carry；Plotted versus is rough, lacks
Detailed analysis；In terms of polarity discriminating, liquid crystal display is not intuitive enough, not obvious enough.
Utility model content
The utility model provides a kind of no-load voltage ratio of current transformer, Check up polarity experimental rig, and solution is shaken in the prior art
The technical issues of dynamic data acquire there are noncontinuity, important information are caused to be lost.
The purpose of this utility model is achieved through the following technical solutions：
A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig, including：Relay-protection tester 1, digital pair
Clamp 1 piece of phase voltammetric meter, test wire and crocodile clip, wherein
The relay-protection tester is used to provide the electric current I1 of input first winding, and current output terminal Ia passes through test wire
Connect with crocodile clip with the end L1 of current transformer first winding to be measured, current output terminal In by test wire with crocodile clip with to
Survey the end the L2 connection of current transformer first winding；
Digital Phase VA Meter with Two Current Sensor, for measuring the phase between once winding current I1 and secondary winding electric current I2
Angle judges the polarity of current transformer to be measured, measures once winding current I1 numerical value and secondary winding electric current I2 numerical value, calculate to
Survey the practical no-load voltage ratio of current transformer, wherein secondary winding in current transformer to be measured is shorted through test wire, and I1 jaw is caught in described
Test wire, and the arrow of Digital Phase VA Meter with Two Current Sensor is directed toward the end L1 of current transformer first winding to be measured, to be measured
Current transformer carries out polarity discriminating；The I2 jaw of Digital Phase VA Meter with Two Current Sensor is caught in the test wire, and digital double
The arrow of pincers phase voltammetric meter is directed toward the end K1 of secondary winding in current transformer to be measured, to carry out polarity to current transformer to be measured
Differentiate.
The utility model provides a kind of no-load voltage ratio of current transformer, Check up polarity experimental rig, by surveying relay protection
Examination instrument is connect with the first winding of current transformer to be measured；The I1 jaw of Digital Phase VA Meter with Two Current Sensor is caught in the test
Line；Secondary winding in current transformer to be measured is shorted through test wire, then the I2 jaw of Digital Phase VA Meter with Two Current Sensor is caught in
The test wire；Digital Phase VA Meter with Two Current Sensor change-over switch is allocated to parameter I1I2, is measured between electric current I1 and electric current I2
Phase angle, according to the phase angle to current transformer to be measured carry out polarity discriminating；Measure the electric current I1 and two of first winding
The electric current I2 of secondary winding calculates the practical no-load voltage ratio of current transformer to be measured according to current value I1 and current value I2.The utility model
Not only it ensure that accuracy, but also improve detection experiment work efficiency, wiring is simple, and it is easy to operate, according to its application principle, the party
Method realizes no-load voltage ratio, polar synchronous detection test i.e. no the case where increasing any additional work amount and any instrument and meter
Under, synchronously complete no-load voltage ratio, Check up polarity test.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the circuit connection diagram of current transformer conventional polar in the prior art test；
Fig. 2 is the circuit connection diagram of current transformer ratio in the prior art detection test；
Fig. 3 is the flow chart of a kind of no-load voltage ratio of current transformer of the utility model embodiment, Check up polarity test method；
Fig. 4 is that a kind of no-load voltage ratio of current transformer, the structure of Check up polarity experimental rig of the utility model embodiment are shown
It is intended to.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
The utility model embodiment provides a kind of no-load voltage ratio of current transformer, Check up polarity test method, such as Fig. 3 institute
Show, including：
Relay-protection tester is connect by step 101 with the first winding of current transformer to be measured；
Wherein, relay-protection tester current output terminal Ia is specifically matched into crocodile clip and Current Mutual Inductance to be measured by test wire
The end L1 of device first winding connects；By relay-protection tester current output terminal In by test wire with crocodile clip and electric current to be measured
The end L2 of mutual inductor first winding connects；
Step 102, the I1 jaw of Digital Phase VA Meter with Two Current Sensor is caught in the current transformer to be measured it is primary around
Group test connecting line, and arrow is directed toward the end L1 of current transformer first winding to be measured；
Wherein, the I1 jaw of Digital Phase VA Meter with Two Current Sensor is specifically caught in the test wire, and digital double pincers phases
The arrow of position volt ampere meter is directed toward the end L1 of current transformer first winding to be measured, is sentenced with carrying out polarity to current transformer to be measured
Not；
Secondary winding in current transformer to be measured is shorted by step 103 through test wire, then Digital Phase VA Meter with Two Current Sensor
I2 jaw be caught in the test wire, and arrow is directed toward the end K1 of secondary winding in current transformer to be measured；
Wherein, specifically secondary winding in current transformer to be measured is shorted through test wire, then digital double phase clamping volt-ampere
The I2 jaw of table is caught in the test wire, and the arrow of Digital Phase VA Meter with Two Current Sensor be directed toward Current Transformer Secondary to be measured around
The end K1 of group, to carry out polarity discriminating to current transformer to be measured；
The electric current I2 of step 104, the electric current I1 for measuring first winding and secondary winding, according to current value I1 and current value
I2 calculates the practical no-load voltage ratio of current transformer to be measured；
Wherein, Digital Phase VA Meter with Two Current Sensor change-over switch is specifically allocated to the corresponding range of parameter I1, measures electric current
Value I1 numerical value simultaneously records, and Digital Phase VA Meter with Two Current Sensor change-over switch is allocated to the corresponding range of parameter I2, measures current value
I2 is simultaneously recorded；According to current value I1 and current value I2, the practical no-load voltage ratio of current transformer to be measured is calculated.In this step calculate to
After the practical no-load voltage ratio for measuring current transformer, it is also necessary to make comparisons, check whether and electricity to be measured with current transformer ontology nameplate
The nameplate of current transformer is consistent.
Digital Phase VA Meter with Two Current Sensor change-over switch is allocated to parameter I1I2, measurement electric current I1 and electric current I2 by step 105
Between phase angle, according to the phase angle to current transformer to be measured carry out polarity discriminating；
Wherein, step 105 can specifically include：
When the phase angle between electric current I1 and electric current I2 is shown as 180 °, then the end L1 of first winding, secondary winding
The end K1 is homopolar end, and the current transformer to be measured is subtractive polarity；When the phase angle between electric current I1 and electric current I2 is shown as
At 0 °, then the end L1 of first winding, secondary winding the end K1 be heteropolarity end, the current transformer to be measured be additive polarity.
Under normal conditions, when the arrow of I1 is directed toward L1, the arrow of I2 is directed toward K1, and Digital Phase VA Meter with Two Current Sensor
When the angle of I1I2 gear is shown as 180 °, it can determine that the polarity for the current transformer is subtractive polarity, be otherwise additive polarity.But
It is, in practical application, the case where 0 ° is shown as the phase angle between electric current I1 and electric current I2, when relay-protection tester does not have
When having output electric current, angle still can show 0 ° (as long as i.e. gear is adjusted to I1I2 after Digital Phase VA Meter with Two Current Sensor booting
Position will show 0 °), so in order to judge whether really to show that 0 ° causes the polarity of current transformer to be judged by accident because of the factor, it can
It is further verified so that arrow direction is exchanged 180 °；Alternatively, as the sequence of the utility model embodiment first carries out step 104
No-load voltage ratio measurement, can ensure that relay-protection tester has output electric current in this way, then carries out the polar judgement of current transformer again.
In addition, when selecting Digital Phase VA Meter with Two Current Sensor, selection is high as far as possible in order to improve the measurement accuracy of this method
Precision type；When using Digital Phase VA Meter with Two Current Sensor, wiring must not be surround.
The utility model provides a kind of no-load voltage ratio of current transformer, Check up polarity test method, by surveying relay protection
Examination instrument is connect with the first winding of current transformer to be measured；The I1 jaw of Digital Phase VA Meter with Two Current Sensor is caught in the test
Line；Secondary winding in current transformer to be measured is shorted through test wire, then the I2 jaw of Digital Phase VA Meter with Two Current Sensor is caught in
The test wire；Digital Phase VA Meter with Two Current Sensor change-over switch is allocated to parameter I1I2, is measured between electric current I1 and electric current I2
Phase angle, according to the phase angle to current transformer to be measured carry out polarity discriminating；Measure the electric current I1 and two of first winding
The electric current I2 of secondary winding calculates the practical no-load voltage ratio of current transformer to be measured according to current value I1 and current value I2.The utility model
Not only it ensure that accuracy, but also improve detection experiment work efficiency, wiring is simple, and it is easy to operate, according to its application principle, the party
Method realizes no-load voltage ratio, polar synchronous detection test i.e. no the case where increasing any additional work amount and any instrument and meter
Under, synchronously complete no-load voltage ratio, Check up polarity test.
In certain project, is compared in the 10kV current transformer detection test of 10kV distribution substation with conventional method, use number
Word formula Phase VA Meter with Two Current Sensor test current mutual inductor polarity and its result precision of no-load voltage ratio are high, and detection experiment work efficiency improves
20% or more, the superior embodiment of energy is easy to carry while smoothly avoiding conventional method disadvantage, and wiring is simple, easy to operate, fits
It is strong with property；Polarity discriminating has the characteristics that intuitive, obvious, clear, easy observation, is not easy to judge by accident.In practical applications, this method is kept away
Exempt from the disconnection of testing current terminal and resumed work, improved work efficiency compared with conventional method, realizes no-load voltage ratio, polar same
Step detection test.During detection test, artificially increases grounding point respectively at the both ends of secondary winding, shunted according to parallel circuit
Principle and Kirchhoff's current law (KCL) check its secondary circuit polarity, and whether correct, secondary circuit is arranged with the presence or absence of multipoint earthing
It looks into and parasitic loop is checked.It checks, investigation finishes and remembers to remove artificial ground wiring.
The utility model embodiment additionally provides a kind of no-load voltage ratio of current transformer, Check up polarity experimental rig, such as Fig. 4 institute
Show, including：Relay-protection tester 210 (Microcomputer Relay ProtectTester, MRPT), digital double pincers
Phase voltammetric meter 220, test wire 230 and current clamp 240, wherein
The relay-protection tester is used to provide the electric current I1 of input first winding, and current output terminal Ia passes through test wire
Connect with crocodile clip with the end L1 of current transformer first winding to be measured, current output terminal In by test wire with crocodile clip with to
Survey the end the L2 connection of current transformer first winding；
Digital Phase VA Meter with Two Current Sensor, for measuring the phase between once winding current I1 and secondary winding electric current I2
Angle judges the polarity of current transformer to be measured, measures once winding current I1 numerical value and secondary winding electric current I2 numerical value, calculate to
Survey the practical no-load voltage ratio of current transformer, wherein secondary winding in current transformer to be measured is shorted through test wire, and I1 jaw is caught in described
Test wire, and the arrow of Digital Phase VA Meter with Two Current Sensor is directed toward the end L1 of current transformer first winding to be measured, to be measured
Current transformer carries out polarity discriminating；The I2 jaw of Digital Phase VA Meter with Two Current Sensor is caught in the test wire, and digital double
The arrow of pincers phase voltammetric meter is directed toward the end K1 of secondary winding in current transformer to be measured, to carry out polarity to current transformer to be measured
Differentiate.
Wherein, the Digital Phase VA Meter with Two Current Sensor is specifically used for showing when the phase angle between electric current I1 and electric current I2
When being 180 °, then the end L1 of first winding, secondary winding the end K1 be homopolar end, the current transformer to be measured be subtract pole
Property；When the phase angle between electric current I1 and electric current I2 is shown as 0 °, then the end L1 of first winding, secondary winding the end K1 be it is different
Polar end, the current transformer to be measured are additive polarity.
The utility model is described in detail above, specific case used herein is to the principles of the present invention
And embodiment is expounded, the method and its core of the above embodiments are only used to help understand the utility model
Thought；At the same time, for those skilled in the art, based on the idea of the present invention, in specific embodiment and application
There will be changes in range, in conclusion the content of the present specification should not be construed as a limitation of the present invention.
Claims (2)
1. a kind of no-load voltage ratio of current transformer, Check up polarity experimental rig, which is characterized in that including：Relay-protection tester 1
Platform, 1 piece of Digital Phase VA Meter with Two Current Sensor, test wire and crocodile clip, wherein the relay-protection tester is for providing input
The electric current I1 of first winding, current output terminal Ia match the end L1 of crocodile clip and current transformer first winding to be measured by test wire
Connection, current output terminal In are connect with crocodile clip with the end L2 of current transformer first winding to be measured by test wire.
2. the no-load voltage ratio of current transformer according to claim 1, Check up polarity experimental rig, which is characterized in that the number
Word formula Phase VA Meter with Two Current Sensor is specifically used for when the phase angle between electric current I1 and electric current I2 is shown as 180 °, then first winding
The end L1, secondary winding the end K1 be homopolar end, the current transformer to be measured be subtractive polarity；When electric current I1 and electric current I2 it
Between phase angle when being shown as 0 °, then the end L1 of first winding, secondary winding the end K1 be heteropolarity end, the electric current to be measured is mutual
Sensor is additive polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820873885.XU CN208172234U (en) | 2018-06-07 | 2018-06-07 | A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820873885.XU CN208172234U (en) | 2018-06-07 | 2018-06-07 | A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig |
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| CN208172234U true CN208172234U (en) | 2018-11-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763965A (en) * | 2020-12-11 | 2021-05-07 | 深圳供电局有限公司 | Comprehensive test device of current transformer |
| CN113567891A (en) * | 2021-08-05 | 2021-10-29 | 中石化第十建设有限公司 | Transformer differential system test method and test device |
-
2018
- 2018-06-07 CN CN201820873885.XU patent/CN208172234U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763965A (en) * | 2020-12-11 | 2021-05-07 | 深圳供电局有限公司 | Comprehensive test device of current transformer |
| CN113567891A (en) * | 2021-08-05 | 2021-10-29 | 中石化第十建设有限公司 | Transformer differential system test method and test device |
| CN113567891B (en) * | 2021-08-05 | 2023-11-17 | 中石化第十建设有限公司 | Transformer differential system test method and test device |
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