CN108459290A - Voltage transformer is than polar detection method - Google Patents
Voltage transformer is than polar detection method Download PDFInfo
- Publication number
- CN108459290A CN108459290A CN201710088508.5A CN201710088508A CN108459290A CN 108459290 A CN108459290 A CN 108459290A CN 201710088508 A CN201710088508 A CN 201710088508A CN 108459290 A CN108459290 A CN 108459290A
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- Prior art keywords
- current
- phase
- voltage
- transformer
- amperometric
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
Abstract
The present invention relates to voltage transformers than polar detection method；Belong to transformer technical field；The two-phase of optional current transformer, is grounded simultaneously at the ends L of first siding ring, one up-flow device of the ends K concatenation；An AC ammeter is concatenated on the neutral conductor n of secondary side；Quantitative alternating current is injected thereto with up-flow device, and size of current and amperometric range can be determined that the order of magnitude is about in 10 1A between 1A by the no-load voltage ratio of current transformer；Observe amperometric variation and reading；The electric current very little of secondary circuit, is approximately zero, if at this time amperometric pointer it is motionless or it is micro- partially, illustrate the secondary circuit of this two-phase under closing face encirclement its electric current similar to circulation；The polarity that it can be applied to live relay protection automatic unit is examined, and is detected it is not necessary that every group of three-phase voltage or current transformer connection solution are split into single mutual inductor, therefore can mitigate workload, is increased substantially experimental work efficiency.
Description
Technical field
The present invention relates to voltage transformers than polar detection method, belongs to transformer technical field.
Background technology
Voltage transformer and transformer are very alike, are all the voltage on conversion line.But transformer voltage of transformation
Purpose be to convey electric energy, therefore capacity is very big, typically using kilovolt-ampere or megavolt-ampere as unit of account；And voltage is mutual
The purpose of sensor voltage of transformation is primarily used to power to measuring instrumentss and protective relaying device, for measure circuit voltage,
Power and electric energy, or for expensive equipment, motor and the transformer in the protection circuit in line failure, therefore voltage
The capacity very little of mutual inductor generally all only has several volt-amperes, tens volt-amperes, and maximum is also no more than one kilovolt-ampere.
Voltage transformer is a transformer with iron core.It is mainly made of first and second coil, iron core and insulation.When
As soon as in application voltage U1 in first winding, a magnetic flux φ is generated in iron core, according to the law of electromagnetic induction, then two
A secondary voltage U2 is just generated in secondary winding.Change primary or secondary winding the number of turns, different primary voltages can be generated
With secondary voltage ratio, this just constitutes the voltage transformer of different ratios.High voltage is converted into low electricity by voltage transformer in proportion
Pressure, i.e. 100V, voltage transformer primary side are connected on primary system, and secondary side connects measuring instrumentss, relay protection etc.；Mainly electromagnetism
(capacitance type potential transformer is widely used) of formula, separately there is non electromagnetic, such as electronic type, photo-electric.
The impedance very little of voltage transformer itself, once short circuit occurs for secondary side, sharp increase is burnt coil by electric current.For
This, the primary side of voltage transformer is connected to fuse, and secondary side reliable ground, in order to avoid when the insulation damage of former and deputy side, secondary side occurs over the ground
High potential and cause the person and equipment breakdown.
Measurement generally all makes single phase two-line coil structures with voltage transformer, and original edge voltage is tested voltage (such as electric power
The line voltage of system), it single-phase can use, V-V shapes can also be connected into two and make three-phase use.The mutual induction of voltage of use for laboratory
Device is often primary side multi-tap, to adapt to measure the needs of different voltages.One is also carried for protective grounding voltage transformer
A tertiary coil claims three-winding voltage transformer.The tertiary coil of three-phase is connected into open-delta, two extractions of open-delta
End couples with the potential winding of ground(preference) relay.
When normal operation, the three-phase voltage of electric system is symmetrical, and the sum of three-phase induction electromotive force on tertiary coil is zero.
When single-phase earthing occurs, there is displacement in neutral point, and residual voltage is just will appear between the terminal of open delta keeps relay dynamic
Make, to shield to electric system.
It is not difficult to find out from the principle features of voltage transformer, voltage transformer secondary survey does not allow short circuit, due to voltage
Mutual inductor internal impedance very little, when secondary loop short circuit, it may appear that damage secondary device is even jeopardized personal peace by many electric currents
Entirely, it is therefore desirable to polar detection.
Invention content
In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of step is simple, reasonable design, spirit
Convenient voltage transformer living is than polar detection method.
To achieve the above object, the technical solution adopted by the present invention is：It is comprised the steps of：
1, before testing, an isolation switch must be disconnected, it is ensured that current transformer internal circuit is in no current state；
2, the two-phase of optional current transformer is grounded simultaneously at the ends L of first siding ring, one up-flow device of the ends K concatenation；
3, an AC ammeter is concatenated on the neutral conductor n of secondary side；
4, quantitative alternating current is injected thereto with up-flow device, size of current and amperometric range can be mutual by electric current
The no-load voltage ratio of sensor determines that the order of magnitude is about in 10-1A between 1A；
5, amperometric variation and reading are observed；Since the original side of another single-phase non-beam opens a way, in secondary star circuit
Middle current relay coil impedance is relatively very high, so the electric current I3 very littles of secondary circuit, are approximately zero, if amperometric at this time
Pointer it is motionless or it is micro- partially (reading IA be also about zero), then illustrate that the secondary circuit of this two-phase its electric current under closing face encirclement is approximate
At circulation, the amount of flowing in and out of electric current is equal on the neutral conductor n where ampere meter, i.e., this two-phase polarity is identical, if ampere meter
Throw of pointer is larger (reading IA is about 2I1), then illustrates that its secondary current flows into neutral conductor n, this bipolarity is different；
6, A, C two-phase Injection Current are taken again, and judge A, C two-phase polarity also according to amperometric reading on the neutral conductor
The similarities and differences；
7, appoint and take two-phase in the head or end of first siding ring while being grounded, and one is concatenated in this two-phase primary side other end
Flow up device；
8, an ampere meter is concatenated in secondary side, it is same simultaneously to observe ampere meter simultaneously with up-flow device Injection Current, if ampere
The pointer of meter is motionless or micro- inclined, then illustrates that the induced potential in the enclosed circuit in secondary closure face is cancelled out each other, two-phase is heteropolar each other
Property (i.e. a, y heterodoxy connects) illustrates the mutual superposition of two-phase induced potential if throw of pointer is larger, and same polarity is (i.e. each other for two-phase
A, y connects with end)；
9, another Injection Current is surveyed again, and secondary detection result is recorded and achieved, and judges this group of current transformer with this
The polarity of triangle connection.
10 and then several groups of results are combined and compared；It can judge the polarity of this group of star-like connection mutual inductor.
The present invention flows into node electric current summation on the arbitrary node in any circuit is equal to the electricity for flowing out the node
Flowing summation, i.e. Σ i enter=and Σ i go out.When a certain node tends to infinitely great limiting case, KCL, which can be extended to, arbitrary uses one
Closing face；The circuit part surrounded；Closing face S encloses partial circuit, and intersects with branch 1,2,3, using KCL laws
I1-i3-i2=0 can be obtained.
There are many voltage transformer first winding the number of turns in the present invention, and secondary winding the number of turns is seldom, is equivalent to downconverter
Device；When work, first winding is connected in parallel in primary circuit, and the potential winding of secondary winding parallel connection instrument, relay；Therefore electricity
It forces down, rated voltage is generally 100V；Capacity is small, only tens volt-amperes or hundreds of volt-amperes；Load impedance is big, its is secondary when work
Side is close to light condition, and its load is constant in most cases.
With the above structure, the present invention has the beneficial effect that：Voltage transformer of the present invention is than polar detection side
Method, the polarity that can be applied to live relay protection automatic unit are examined, are not necessarily to every group of three-phase voltage or current transformer connection
Solution is split into single mutual inductor and is detected, therefore can mitigate workload, increases substantially experimental work efficiency；It can be according to judgement
Polarity determines the delta connection sequence of voltage or secondary loop of mutual inductor.For checking triangle circuit connection mistake, make
The exclusion of failure seems particularly clear convenience.
Specific implementation mode
Present embodiment comprises the steps of：
1, before testing, an isolation switch must be disconnected, it is ensured that current transformer internal circuit is in no current state；
2, the two-phase of optional current transformer is grounded simultaneously at the ends L of first siding ring, one up-flow device of the ends K concatenation；
3, an AC ammeter is concatenated on the neutral conductor n of secondary side；
4, quantitative alternating current is injected thereto with up-flow device, size of current and amperometric range can be mutual by electric current
The no-load voltage ratio of sensor determines that the order of magnitude is about in 10-1A between 1A；
5, amperometric variation and reading are observed；Since the original side of another single-phase non-beam opens a way, in secondary star circuit
Middle current relay coil impedance is relatively very high, so the electric current I3 very littles of secondary circuit, are approximately zero, if amperometric at this time
Pointer it is motionless or it is micro- partially (reading IA be also about zero), then illustrate that the secondary circuit of this two-phase its electric current under closing face encirclement is approximate
At circulation, the amount of flowing in and out of electric current is equal on the neutral conductor n where ampere meter, i.e., this two-phase polarity is identical, if ampere meter
Throw of pointer is larger (reading IA is about 2I1), then illustrates that its secondary current flows into neutral conductor n, this bipolarity is different；
6, A, C two-phase Injection Current are taken again, and judge A, C two-phase polarity also according to amperometric reading on the neutral conductor
The similarities and differences；
7, appoint and take two-phase in the head or end of first siding ring while being grounded, and one is concatenated in this two-phase primary side other end
Flow up device；
8, an ampere meter is concatenated in secondary side, it is same simultaneously to observe ampere meter simultaneously with up-flow device Injection Current, if ampere
The pointer of meter is motionless or micro- inclined, then illustrates that the induced potential in the enclosed circuit in secondary closure face is cancelled out each other, two-phase is heteropolar each other
Property (i.e. a, y heterodoxy connects) illustrates the mutual superposition of two-phase induced potential if throw of pointer is larger, and same polarity is (i.e. each other for two-phase
A, y connects with end)；
9, another Injection Current is surveyed again, and secondary detection result is recorded and achieved, and judges this group of current transformer with this
The polarity of triangle connection.
10 and then several groups of results are combined and compared；It can judge the polarity of this group of star-like connection mutual inductor.
Present embodiment flows into node electric current summation on the arbitrary node in any circuit should equal to outflow
The electric current summation of node, i.e. Σ i enter=and Σ i go out.When a certain node tends to infinitely great limiting case, KCL can be extended to
The arbitrary circuit part surrounded with a closing face (dotted line indicates the intersecting lens with paper plane).Closing face S encloses part
Circuit, and intersect with branch 1,2,3, it can obtain i1-i3-i2=0 using KCL laws.
With the above structure, present embodiment has the beneficial effect that：Mutual induction of voltage described in present embodiment
Device than polar detection method, examine, be not necessarily to every group of three-phase voltage by the polarity that can be applied to live relay protection automatic unit
Or current transformer connection solution is split into single mutual inductor and is detected, therefore workload can be mitigated, increase substantially experimental work
Efficiency；The delta connection sequence of voltage or secondary loop of mutual inductor can be determined according to the polarity of judgement.For checking three
Angular convolution road wiring error so that the exclusion of failure seems particularly clear convenience.
The above is merely illustrative of the technical solution of the present invention and unrestricted, and those of ordinary skill in the art are to this hair
The other modifications or equivalent replacement that bright technical solution is made, as long as it does not depart from the spirit and scope of the technical scheme of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (3)
1. voltage transformer is than polar detection method, it is characterised in that：It is comprised the steps of：
(1), an isolation switch must before testing, be disconnected, it is ensured that current transformer internal circuit is in no current state；
(2), the two-phase of optional current transformer is grounded simultaneously at the ends L of first siding ring, one up-flow device of the ends K concatenation；
(3), an AC ammeter is concatenated on the neutral conductor n of secondary side；
(4), quantitative alternating current is injected thereto with up-flow device, size of current and amperometric range can be by Current Mutual Inductances
The no-load voltage ratio of device determines that the order of magnitude is about in 10-1A between 1A；
(5), amperometric variation and reading are observed；Since the original side of another single-phase non-beam opens a way, in secondary star circuit
Current relay coil impedance is relatively very high, so the electric current I3 very littles of secondary circuit, are approximately zero, if amperometric finger at this time
Needle it is motionless or it is micro- partially, then illustrating the secondary circuit of this two-phase, its electric current is similar to circulation under closing face encirclement, where ampere meter
Neutral conductor n on electric current the amount of flowing in and out it is equal, i.e., this two-phase polarity is identical, if ampere meter throw of pointer is larger, says
Its bright secondary current flows into neutral conductor n, this bipolarity is different；
(6), A, C two-phase Injection Current are taken again, and judge that A, C two-phase are polar also according to amperometric reading on the neutral conductor
The similarities and differences；
(7), appoint and take two-phase in the head or end of first siding ring while being grounded, and one liter is concatenated in this two-phase primary side other end
Flow device；
(8), an ampere meter is concatenated in secondary side, it is same simultaneously to observe ampere meter simultaneously with up-flow device Injection Current, if ampere meter
Pointer it is motionless or it is micro- then illustrate that the induced potential in the enclosed circuit in secondary closure face is cancelled out each other partially, two-phase heteropolarity each other,
If throw of pointer is larger, illustrate the mutual superposition of two-phase induced potential, two-phase same polarity each other；
(9), another Injection Current is surveyed again, and secondary detection result is recorded and achieved, and judges this group of current transformer three with this
The polarity of Angle connection.
(10) and then by several groups of results combine and compare；It can judge the polarity of this group of star-like connection mutual inductor.
2. voltage transformer according to claim 1 is than polar detection method, it is characterised in that：In any circuit
The electric current summation that the node is flowed on arbitrary node is equal to the electric current summation for flowing out the node, i.e. and Σ i enter=and Σ i go out；When a certain
When node tends to infinitely great limiting case, KCL can extend to the arbitrary circuit part surrounded with a closing face.
3. voltage transformer according to claim 1 is than polar detection method, it is characterised in that：Voltage transformer is primary
There are many umber of turn, and secondary winding the number of turns is seldom, is equivalent to step-down transformer；When work, first winding is connected in parallel on primary electricity
Lu Zhong, and the potential winding of secondary winding parallel connection instrument, relay；Therefore voltage is low, and rated voltage is generally 100V；Capacity
It is small, only tens volt-amperes or hundreds of volt-amperes；Load impedance is big, its secondary side is close to light condition when work, and most cases
Its lower load is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710088508.5A CN108459290A (en) | 2017-02-20 | 2017-02-20 | Voltage transformer is than polar detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710088508.5A CN108459290A (en) | 2017-02-20 | 2017-02-20 | Voltage transformer is than polar detection method |
Publications (1)
| Publication Number | Publication Date |
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| CN108459290A true CN108459290A (en) | 2018-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710088508.5A Withdrawn CN108459290A (en) | 2017-02-20 | 2017-02-20 | Voltage transformer is than polar detection method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203117358U (en) * | 2013-01-30 | 2013-08-07 | 江苏省电力公司常州供电公司 | Intelligent tester for secondary polarity of four-star-shaped voltage transformer |
| CN103954883A (en) * | 2014-05-21 | 2014-07-30 | 中国化学工程第十一建设有限公司 | Voltage transformer secondary connection inspecting method and device |
| CN103969540A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Method for testing wiring of secondary circuits of four-star voltage transformers |
| CN104166072A (en) * | 2014-08-22 | 2014-11-26 | 江苏省电力公司常州供电公司 | Intelligent polarity detection device and method for four-star type voltage transformer |
-
2017
- 2017-02-20 CN CN201710088508.5A patent/CN108459290A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203117358U (en) * | 2013-01-30 | 2013-08-07 | 江苏省电力公司常州供电公司 | Intelligent tester for secondary polarity of four-star-shaped voltage transformer |
| CN103969540A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Method for testing wiring of secondary circuits of four-star voltage transformers |
| CN103954883A (en) * | 2014-05-21 | 2014-07-30 | 中国化学工程第十一建设有限公司 | Voltage transformer secondary connection inspecting method and device |
| CN104166072A (en) * | 2014-08-22 | 2014-11-26 | 江苏省电力公司常州供电公司 | Intelligent polarity detection device and method for four-star type voltage transformer |
Non-Patent Citations (2)
| Title |
|---|
| LOJ喵CYJ: "电感线圈：互感器的工作原理", 《百度文库》 * |
| 叶启明: "判断电压电流互感器极性的新方法", 《大众用电》 * |
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Application publication date: 20180828 |