CN205665358U - Withstand voltage test system is executed outward to large -scale transformer neutral point - Google Patents
Withstand voltage test system is executed outward to large -scale transformer neutral point Download PDFInfo
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- CN205665358U CN205665358U CN201620491846.4U CN201620491846U CN205665358U CN 205665358 U CN205665358 U CN 205665358U CN 201620491846 U CN201620491846 U CN 201620491846U CN 205665358 U CN205665358 U CN 205665358U
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 230000007935 neutral effect Effects 0.000 title claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 2
- 229960001484 edetic acid Drugs 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 abstract 3
- 238000009413 insulation Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses an execute the withstand voltage test system outside the large -scale transformer neutral point scene, include high tension switchgear, the experimental power of frequency conversion, excitation transformer, protection resistance, frequency compensation unit, survey article unit and ampere meter, high tension switchgear access AC electric current, high tension switchgear, the experimental power of frequency conversion are connected with excitation transformer electricity in proper order, the high voltage loop circuit connect protection resistance R and the ampere meter of excitation transformer, the frequency compensation unit is connected to the other end of protection resistance R and ampere meter, the frequency compensation unit and by the unit connection of the article of survey, the frequency compensation unit includes cascade compensation reactor and shunt compensation capacitor unit, included by examination article and alternating voltage measuring unit by the article of survey unit that it is parallelly connected with alternating voltage measuring unit to be tried article. The utility model discloses can execute withstand voltage test outside large -scale transformer neutral point scene is accomplished to the power frequency within range with test frequency control, effectively guarantee the reliable safe operation of transformer equipment.
Description
Technical field
This utility model relates to transformer neutral point pressure test technical field, is specifically related to a kind of high-power transformer neutral
Pressure test system is executed outside point is on-the-spot.
Background technology
According to the requirement of " Erection works of electrical installations Standard for handover test of electric equipment " (GB50150-2006), main transformer pressure
Device is during carrying out on-the-spot commissioning test, and winding rated voltage is 110kV and above transformator, and its neutral point should be handed over
Stream pressure test, test withstanding voltage standard is the 80% of delivery test magnitude of voltage；Its China and foreign countries execute the frequency of ac voltage withstanding test voltage
Rate is 45-65Hz, and under full voltage, tolerance time is 60s.
According to existing field testing procedure, owing to tested transformer neutral point insulation against ground can be equivalent to an equivalent electric
Hold, by producing required test voltage value with series compensation reactor series resonance scene, use voltage measurement unit prison simultaneously
Survey.But owing to tested transformer neutral point insulation against ground equivalent capacitance value is according to different there are differences of transformer type, for
Ensure that series resonance frequency meets power frequency scope (45-65Hz), it is desirable to the different different series compensations of transformer neutral point coupling
Reactor, thus cause and execute series compensation reactor parameter in pressurized system outside high-power transformer neutral point and vary, do not have
The flexible suitability of standby on-the-spot test.And test transform capacity is big, experimental facilities is heavy, inconvenience carrying, gives on-the-spot test tape
Carry out difficulty.
Notification number be the utility model patent of CN205157710 disclose a kind of extra-high voltage neutral reactor presence should
Pressure test system, including frequency conversion experiment power supply, exciting transformer, compensation capacitor unit, tested article unit, frequency conversion test electricity
Source, exciting transformer, compensation capacitor unit, tested article unit are sequentially connected with, during the tested article unit of this pilot system includes
Property point reactor and ac voltage measurement unit, parallel capacitor is in parallel with neutral reactor, to tested article unit
Neutral reactor carries out induced over voltage withstand test, and this system is to carry out pressure examination for 1000kV extra-high voltage transformer neutral point
Testing, tested transformator scope is less, need to mate different series connection time in actual use to different tested device unit testing
Compensation reactor, does not possess the flexible suitability of on-the-spot test, and the scene test of giving brings difficulty.
Utility model content
In view of this, the purpose of this utility model is for the deficiencies in the prior art, it is provided that a kind of high-power transformer is neutral
Pressure test system is executed, it is possible to on-the-spot high-power transformer neutral point executes pressure test outside carrying out, it is adaptable to various outside point is on-the-spot
High-power transformer, on-the-spot test is flexibly, easy to operate.
For solving above-mentioned technical problem, technical solution adopted in the utility model is as follows:
Pressure test system is executed, wherein, including high-tension switch cabinet, frequency conversion test outside a kind of high-power transformer neutral point scene
Power supply, exciting transformer, protective resistance, frequency compensation unit, tested article unit and ammeter, described high-tension switch cabinet accesses A/
C electric current, described high-tension switch cabinet, frequency conversion experiment power supply are sequentially connected electrically with exciting transformer；The high pressure of described exciting transformer
Loop connection protective resistance R and ammeter, the other end rate of connections compensating unit of described protective resistance R and ammeter, described
Frequency compensation unit is connected with described tested article unit；Described frequency compensation unit includes series compensation reactor and shunt compensation
Capacitor unit；Described tested article unit includes that test specimen and ac voltage measurement unit, described test specimen are surveyed with alternating voltage
Amount unit is in parallel；Described ac voltage measurement unit is made up of high-voltage bleeder C10 and low pressure potentiometer C11, and described high pressure divides
Depressor C10 and low pressure potentiometer C11 is in parallel with described test specimen after connecting.
Preferably, described parallel capacitor unit includes capacitor C1-C9, and described capacitor C1-C3 parallel connection is even
Connecing, described capacitor C4-C6 is connected in parallel, and described capacitor C7-C9 is connected in parallel, described in be connected in parallel after capacitor C1-
C3, C4-C6, C7-C9 are connected in series.
Preferably, described ac voltage measurement unit also includes kilovoltmeter, described kilovoltmeter and described low pressure
Potentiometer C11 is in parallel.
Preferably, described ac voltage measurement unit includes kilovoltmeter.
Preferably, described series compensation reactor is high voltage reactor.
Preferably, described tested article unit also includes variable inductor C12, described variable inductor C12 and test specimen string
Connection connects.
The beneficial effects of the utility model are:
Frequency compensation unit of the present utility model uses series compensation reactor and parallel capacitor unit composition, and
Connection compensates capacitor unit and is made up of capacitor C1-C9, increases pressure voltage while ensureing to increase capacitance.In use
Can directly change this capacitor when certain capacitor failure, it is not necessary to integral replacing, reduce maintenance cost, and by multiple
Capacitor composition has been also convenient for the arrangement of the parallel capacitor unit of entirety, reduces the volume of equipment.
This utility model adds variable inductor C12 in tested article unit, at the trial, for different large-scale changes
Depressor, can complete different transformer neutral point couplings, it is possible to flexibly to various large-scale by regulation variable inductor C12
Pressure test is executed, it is possible to complete the on-the-spot test to transformer neutral point insulation outside the neutral point scene of transformator.
This utility model equipment conveying is convenient, and floor space is little, adapts to the transport between different tests scene, breaches tradition
Execute Withstand test device outside neutral point scene and not there is the bottleneck of on-the-spot broad applicability, make the neutral point of various high-power transformer
Execute outward pressure added test voltage to control to be possibly realized in the range of power frequency, filled up execute outside domestic on-the-spot neutral point scene pressure
The blank of assay device.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of this utility model embodiment 1.
Fig. 2 is the circuit theory diagrams of this utility model embodiment 2.
Detailed description of the invention
Below in conjunction with the accompanying drawings utility model technical scheme is further illustrated:
Embodiment 1:
This utility model includes that high-tension switch cabinet 1, frequency conversion experiment power supply 2, exciting transformer 3, protective resistance R, frequency are mended
Repaying unit 4, tested article unit 5 and ammeter, high-tension switch cabinet 1 accesses A/C electric current, high-tension switch cabinet 1, frequency conversion experiment power supply 2
Being sequentially connected electrically with exciting transformer 3, the output voltage U1 of frequency conversion experiment power supply 2 is boosted as U2, excitation-transformation variable by exciting transformer 3
Series connection protective resistance R and ammeter in depressor 3 high tension loop.Tested article unit 5 is by test specimen 6 and ac voltage measurement unit 7
Composition, test specimen 6 is in parallel with ac voltage measurement unit 7.Frequency compensation unit 4 is by series compensation reactor 8 and shunt compensation
Capacitor unit 9 forms；Parallel capacitor unit 9 connects 8 with series compensation reactor, parallel capacitor unit 9
Being made up of nine identical capacitor C1 ~ C9, wherein, capacitor C1 ~ C9 is divided into three groups, first group: capacitor C1, C2, C3 are also
Connection, second group: capacitor C4, C5, C6 are in parallel, the 3rd group: capacitor C7, C8, C9 are in parallel, and then this three group capacitor is connected on
Together, while ensureing to increase capacitance, pressure voltage is increased.Test specimen 6 equivalence neutral point electric capacity CX.
Exciting transformer 3 excites resonant tank, makes the series compensation in loop by frequency conversion experiment power supply 2 output frequency
There is resonance in reactor 8 and parallel capacitor unit 9.Exciting transformer 3 is played the effect of protection by high-tension switch cabinet 1,
Prevent the excessive damage equipment of electric current.Ac voltage measurement unit 7 also includes kilovoltmeter, uses kilovoltmeter to alternating current
Pressure measures, high-voltage bleeder C10 and low pressure show that instrument forms, and low pressure display instrument is by low pressure potentiometer C11 and electricity
Pressure table composition, it is ensured that the transformer neutral point voltage of pressure test is monitored.
The output voltage of frequency conversion experiment power supply 2 is raised to suitably by this utility model at the trial by exciting transformer 3
Magnitude of voltage, to excite whole test loop, the output frequency of regulation frequency conversion experiment power supply, make the frequency compensation unit 4 in loop
Realizing resonant frequency is 50HZ, and now the output frequency of frequency conversion experiment power supply 2 is test frequency, test specimen 6 equivalent capacity institute
Making alive is resonance potential.According to series resonance principal, this pilot system utilizes high voltage reactor and and capacitor resonant tank product
Raw high voltage and big electric current, power supply only needs the meritorious part consumed in offer system, and required power supply capacity significantly reduces, experiment
The volume and weight of equipment the most significantly reduces.And parallel capacitor unit is in parallel with test specimen in pilot system, it is whole
The capacitance of individual device increases, and the scope of test frequency increases the most therewith, the expanded range of the most tested transformator.At resonance shape
State, when the insulation weak-point of test specimen is breakdown, circuit takes off humorous immediately, and loop current declines immediately, it is possible to electric current in the loop
Table shows.
Embodiment 2:
Difference from Example 1 is, tested article unit 5 includes test specimen 6, ac voltage measurement unit 7 and variable
Inducer C12.At the trial, for different high-power transformers, can be completed difference by regulation variable inductor C12
Transformer neutral point mates, it is possible to execute pressure test to outside the neutral point scene of various high-power transformers flexibly, it is possible to complete existing
The field test to transformer neutral point insulation.
Finally illustrate, above example only in order to the technical solution of the utility model to be described and unrestricted, this area
Other amendment or equivalents that the technical solution of the utility model is made by those of ordinary skill, without departing from this practicality
The spirit and scope of new technique scheme, all should contain in the middle of right of the present utility model.
Claims (6)
1. execute pressure test system outside a high-power transformer neutral point scene, it is characterised in that: include high-tension switch cabinet, frequency conversion
Experiment power supply, exciting transformer, protective resistance, frequency compensation unit, tested article unit and ammeter, described high-tension switch cabinet connects
Entering A/C electric current, described high-tension switch cabinet, frequency conversion experiment power supply are sequentially connected electrically with exciting transformer；Described exciting transformer
High tension loop connection protective resistance R and ammeter, the other end rate of connections compensating unit of described protective resistance R and ammeter,
Described frequency compensation unit is connected with described tested article unit；Described frequency compensation unit includes series compensation reactor and parallel connection
Compensate capacitor unit；Described tested article unit includes test specimen and ac voltage measurement unit, described test specimen and alternating current
Pressure measuring unit is in parallel；Described ac voltage measurement unit is made up of high-voltage bleeder C10 and low pressure potentiometer C11, described height
Pressure potentiometer C10 and low pressure potentiometer C11 is in parallel with described test specimen after connecting.
2. execute pressure test system outside high-power transformer neutral point scene as claimed in claim 1, it is characterised in that: described also
Connection compensates capacitor unit and includes that capacitor C1-C9, described capacitor C1-C3 are connected in parallel, and described capacitor C4-C6 is in parallel
Connect, described capacitor C7-C9 is connected in parallel, described in be connected in parallel after capacitor C1-C3, C4-C6, C7-C9 be connected in series.
3. execute pressure test system outside high-power transformer neutral point scene as claimed in claim 1, it is characterised in that: described friendship
Stream voltage measurement unit also includes kilovoltmeter, and described kilovoltmeter is in parallel with described low pressure potentiometer C11.
4. execute pressure test system outside high-power transformer neutral point scene as claimed in claim 1, it is characterised in that: described friendship
Stream voltage measurement unit includes kilovoltmeter.
5. execute pressure test system outside high-power transformer neutral point scene as claimed in claim 1, it is characterised in that: described string
Connection compensation reactor is high voltage reactor.
6. executing pressure test system outside the high-power transformer neutral point scene as described in any one of claim 1-5, its feature exists
In: described tested article unit also includes that variable inductor C12, described variable inductor C12 are connected in series with test specimen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620491846.4U CN205665358U (en) | 2016-05-26 | 2016-05-26 | Withstand voltage test system is executed outward to large -scale transformer neutral point |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620491846.4U CN205665358U (en) | 2016-05-26 | 2016-05-26 | Withstand voltage test system is executed outward to large -scale transformer neutral point |
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| Publication Number | Publication Date |
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| CN205665358U true CN205665358U (en) | 2016-10-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771911A (en) * | 2016-12-09 | 2017-05-31 | 广西电友科技发展有限公司 | A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel |
-
2016
- 2016-05-26 CN CN201620491846.4U patent/CN205665358U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771911A (en) * | 2016-12-09 | 2017-05-31 | 广西电友科技发展有限公司 | A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel |
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