CN103267933B - The method of shelf depreciation in measuring transformer induced voltage test device - Google Patents
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Abstract
The invention discloses a kind of method of shelf depreciation in measuring transformer induced voltage test device, a resonant capacitance in parallel at the two ends of compensation reactor, electrically connect a detection impedance in the junction of two electric capacity arms, utilize the shelf depreciation in shelf depreciation instrument experiment with measuring device；Powering testing transformer, external ac power source accesses the low-pressure side of testing transformer by variable-frequency power sources；Adjust the electric voltage frequency of variable-frequency power sources output, make compensation reactor and resonance capacitor loop resonance；The voltage of elevated external alternating current power supply, the high side voltage selecting now testing transformer is the first high side voltage, measures now partial discharge quantity；Continuing elevated external AC supply voltage on the basis of step 5, the high side voltage selecting now testing transformer is the second high side voltage, measures now partial discharge quantity.The advantage that device is calibrated before can getting rid of the external shelf depreciation of self disturbing accurate experiment with measuring device and can be used for test by realization.
Description
Technical field
The present invention is in particular it relates to a kind of method of shelf depreciation in measuring transformer induced voltage test device.
Background technology
At present, time long, induced voltage test (ACLD) can be in order to simulate transient over-voltage and continuous working voltage effect
Reliability.And the test of additional measurement of partial discharge can be used for detecting inside transformer non-through defect.
When media interior generation shelf depreciation, the quantity of electric charge of internal movement is referred to as actual discharge amount, because actual discharge
Being to carry out at media interior, its discharge capacity cannot be measured.But according to the analysis of prior art, Apparent discharge magnitude is put with actual
There is certain incidence relation in electricity, can indirectly obtain actual discharge amount by measuring Apparent discharge magnitude.Such as become at one
In the test product of depressor, the Apparent discharge magnitude varied in size may occur simultaneously, the maximum Apparent discharge magnitude of stable appearance is referred to as
The discharge capacity of shelf depreciation.
During shelf depreciation, test product two ends produce a change in voltage the most instantaneous.According to the principle of pulse current method, as
Fruit is linked into measure loop test product, will produce pulse current, measure pulse current, just with a highly sensitive electronic machine
Can determine whether to exist shelf depreciation, and detect its strength of discharge.In prior art, measure shelf depreciation and there is direct method peace
Weighing apparatus method.Being direct method as shown in Figure 1a, test product equivalent capacity Cx, with to couple electric capacity Ck in parallel, measured impedance Z m and couples capacitor
Ck connects.Being the another kind of connection of direct method as shown in Figure 1 b, test product equivalent capacity Cx, with to couple electric capacity Ck in parallel, measures impedance
Zm connects with coupling capacitor Cx, in parallel with coupling capacitor Ck.Wherein M is measurement of partial discharge instrument, and Zf is hv filtering device.
Existing utilize pulse current method measure single-phase two-winding transformer induced voltage test loop.Wherein, include
Assay device and tested transformator.Wherein assay device includes AC380V power supply, variable-frequency power sources, testing transformer, compensating reactance
Device, measurement potentiometer.Three alternating current power supplys access the low-pressure side of testing transformer by variable-frequency power sources.The high-pressure side of testing transformer
It is connected with by the input side of testing transformer, is parallel with compensation reactor in the high-pressure side of testing transformer and measures potentiometer.
Control station connects variable-frequency power sources by optical cable., when for power transformer test, generally utilize the height of tested transformator self
Gland pipe, as coupling electric capacity, accesses detection impedance in bottom shielding of bushing series connection and measures.
But, according to technical standard and test requirements document, partial discharge of transformer can not be more than 500pC.This is one and compares
Little amount, the most at the scene in the middle of test.Therefore, when partial discharge of transformer is tested, the interference outside eliminating becomes special
The most important.And the electric discharge in assay device, on measuring impact greatly.If there is bigger electric discharge in assay device, such as, greatly
In 5000pC, and conduct to test product, the most tested transformator 140, by having the interference to hundreds of pC in tested transformator, cause
Cannot judge that shelf depreciation is from tested transformator, or the interference from assay device；Therefore, assay device is put
Electricity is calibrated, and particularly records shelf depreciation when being above standard, when i.e. there is bigger discharge capacity, it is difficult to judge shelf depreciation
Source.
Therefore, current local discharge measuring method has the drawback that (1) cannot before the test, specially to device
Calibrate；(2) calibration cannot be carried out quantitatively, it is impossible to grasp the concrete value of device shelf depreciation；(3) other are discharged
Measure normal test product and repeat test, test product is existed to the risk accelerating insulation ag(e)ing；(4) after on-the-spot test being pinpointed the problems, nothing
Method solves in time.
Summary of the invention
It is an object of the invention to, for the problems referred to above, propose office in a kind of measuring transformer induced voltage test device
The method of portion's electric discharge, to realize to get rid of the external shelf depreciation of self disturbing accurate experiment with measuring device and can be used for
The advantage before Shi Yan, device calibrated.
For achieving the above object, the technical solution used in the present invention is:
A kind of method of shelf depreciation in measuring transformer induced voltage test device, described assay device includes that test becomes
Depressor, compensation reactor and measurement potentiometer, described compensation reactor and measurement potentiometer are connected in parallel on the high pressure of testing transformer
Side, described measurement potentiometer at least two electric capacity arms are in series, and one of them is high-voltage capacitance arm, and another is low tension
Hold arm, and this experimental provision be for carrying out induced voltage test to outside tested transformator,
Step one a: resonant capacitance in parallel, the capacitance of this resonant capacitance and above-mentioned quilt at the two ends of compensation reactor
The equivalent capacitance value of examination transformator is equal, and described resonant capacitance can be with compensation reactor in 100-300Hz frequency range
There is resonance；
Step 2: electrically connect a detection impedance in the junction of two electric capacity arms, the input electricity of described detection impedance
Being connected between two electric capacity arms, the outfan of described detection impedance electrically connects instrument for measuring partial discharge, utilizes this shelf depreciation
Shelf depreciation in instrument experiment with measuring device；
Step 3: power testing transformer, external ac power source accesses the low pressure of testing transformer by variable-frequency power sources
Side；
Step 4: adjust the electric voltage frequency of variable-frequency power sources output, make compensation reactor and resonance capacitor loop resonance；
Step 5: the voltage of elevated external alternating current power supply, the high side voltage selecting now testing transformer is the first height
Pressure side voltage, keeps a period of time, measures now partial discharge quantity；
Step 6: continue elevated external AC supply voltage on the basis of step 5, select now testing transformer
High side voltage is the second high side voltage, keeps a period of time, measures now partial discharge quantity.
Further, in step 5 and step 6, voltage hold-time is one minute.
Further, described resonant capacitance local under the conditions of operating frequency is 30-300Hz and voltage is 120kV
Electric discharge is less than 10pC.
Further, when the transformer induction voltage test of 750kV, the capacitance of described resonant capacitance is 1.8 μ F-
2.2 μ F, described first high side voltage is 69.3kV, and described second high side voltage is 94.5kV.
Further, the capacitance of described resonant capacitance is 2 μ F.
Further, when the transformer induction voltage test of 220kV, the capacitance of described resonant capacitance is 0.2-0.3 μ
F；Described first high side voltage is 11kV, and described second high side voltage is 15kV.
Further, the capacitance of described resonant capacitance is 0.25 μ F.
Further, when the transformer induction voltage test of 330kV, the capacitance of described resonant capacitance is 0.2-0.5 μ
F, described first high side voltage is 38.5kV, and described second high side voltage is 52.5kV.
Further, the capacitance of described resonant capacitance is 0.35 μ F.
Technical scheme has the advantages that
Technical scheme, is replaced by testing transformer by resonant capacitance so that assay device can be formed also
Connection resonant tank is to make assay device effectively work, and measures the shelf depreciation of this device in this case, thus avoids
The tested transformer discharge impact on assay device, has reached while getting rid of external interference accurately experiment with measuring device
The shelf depreciation of self and can be used for purpose that device is calibrated before test.And according to different experimental voltages, select
Suitable resonant capacitance, so that experimental result is more accurate, gets rid of the interference of device electric discharge.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 a and Fig. 1 b is to use direct method to measure the circuit diagram of shelf depreciation in prior art；
Fig. 2 is the circuit diagram of the device for transformer induction voltage test of the present invention.
In conjunction with accompanying drawing, in the embodiment of the present invention, reference is as follows:
100-variable-frequency power sources；110-testing transformer；120-compensation reactor；130-measures potentiometer；160-detects resistance
Anti-；170-control station；180-instrument for measuring partial discharge；190-A.C. voltmeter；200-resonant capacitance.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred reality described herein
Execute example be merely to illustrate and explain the present invention, be not intended to limit the present invention.
A kind of method of shelf depreciation in measuring transformer induced voltage test device, assay device is as in figure 2 it is shown, include
Testing transformer 110, compensation reactor 120 and measurement potentiometer 130, compensation reactor 120 and measurement potentiometer 130 are connected in parallel on
The high-pressure side of testing transformer 110, measures potentiometer 130 at least two electric capacity arms and is in series, and one of them is high-tension electricity
Holding arm, another is low-voltage capacitance arm, and this experimental provision is for carrying out induced voltage test to outside tested transformator, its
Measuring method is specific as follows:
Step one a: resonant capacitance 200 in parallel, the capacitance of this resonant capacitance 200 at the two ends of compensation reactor 120
Equal with the equivalent capacitance value of tested transformator, and resonant capacitance can be with compensation reactor 120 in 100-300Hz frequency range
Interior generation resonance；
Step 2: electrically connect a detection impedance 160, the input of detection impedance 160 in the junction of two electric capacity arms
Being connected electrically between two electric capacity arms, the outfan of detection impedance 160 electrically connects instrument for measuring partial discharge 180, utilizes this local
Shelf depreciation in discharge instrument 180 experiment with measuring device；
Step 3: power testing transformer 110, external ac power source accesses testing transformer by variable-frequency power sources 100
The low-pressure side of 110；
Step 4: adjust the electric voltage frequency of variable-frequency power sources 100 output, make compensation reactor 120 and resonant capacitance 200 loop
Resonance；
Step 5: the voltage of elevated external alternating current power supply, the high side voltage selecting now testing transformer 110 is first
High side voltage, keeps a period of time, measures now partial discharge quantity；
Step 6: continue elevated external AC supply voltage on the basis of step 5, select now testing transformer 110
High side voltage be the second high side voltage, keep a period of time, measure now partial discharge quantity.
Wherein, in step 5 and step 6, voltage hold-time is one minute.Can be according to the experiment demand length to the time
Short select.
Compensation reactor 120 includes at least one compensation reactor L, it is preferable that gone here and there by plural compensation electric controller L
Connection is formed.
The inductance ratings 1.1H of compensation reactor 120, rated voltage 120kV, rated current 30A.Measure potentiometer 130 by
Plural electric capacity C1 and C2 is in series, and wherein, electric capacity C1 is the high-voltage capacitance arm measuring potentiometer, and its parameter is: electricity
Capacitance 1000pF, rated voltage 120kV, electric capacity C2 is then for measuring the low-voltage capacitance arm of potentiometer, and its parameter example is: capacitance
It is 1 F, rated voltage 1kV, potentiometer specified intrinsic standoff ratio 1000:1 the most now.In actual application, the value of C1 and C2 can depend on
Need to determine intrinsic standoff ratio and the corresponding capacitance value of the two according to concrete measurement.
Described resonant capacitance 200 it is parallel with at the two ends of compensation reactor.The input of detection impedance 160 connects to measure and divides
Between the electric capacity arm of depressor 130, i.e. between electric capacity C1 and electric capacity C2, earth terminal then ground connection, instrument for measuring partial discharge 180 then passes through
Measure signal cable and connect the outfan of described detection impedance 160.A.C. voltmeter 190 connects described by measuring signal cable
Measure the electric capacity arm of potentiometer, i.e. between electric capacity C1 and electric capacity C2.Control station 170 connects variable-frequency power sources 100 by optical cable, with control
Variable-frequency power sources processed exports.
When so working, C1 serves a dual purpose: the high-voltage capacitance arm of (1) voltage-dividing capacitor；(2) needed for measuring shelf depreciation
The coupling electric capacity wanted.
The value principle of compensation reactor 120 inductance value in assay device is: can be with resonant capacitance 200 at 100-
There is parallel resonance in the range of 300Hz, thus under conditions of higher than 2 times of power frequencies, outside tested transformator is sensed
Voltage test.
The selection of the parameter of resonant capacitance 200 should be for carry out the parameter of tested transformator tested.Work electricity
Pressure for 750kV, and running voltage be 330, the method for 220kV transformer test device measurement of partial discharge be identical, simply
The capacity of the resonant capacitance 200 used is different.Below in an example, it is as a example by 750 kV by running voltage, illustrates
Choosing of the parameter of resonant capacitance 200.
Owing to the equivalent electric capacity of tested transformator 140 is a scope, for 750kV, usually 1.8 μ F-2.2 μ F,
Therefore, the capacitance of resonant capacitance 200 is 1.8 μ F-2.2 μ F, it is preferable that the capacitance of resonant capacitance 200 is 2 μ F, the most humorous
Shaking the actual equivalent capacity of electric capacity 200, test effect is preferable.
For the tested transformator of 750kV, low-pressure side only needs to input 94.5kV.Therefore, a minute of resonant capacitance 200
Power frequency withstanding voltage is 70kV-140kV.This scope fully meets and works under 94.5kV, measures the requirement of shelf depreciation.Preferably
Ground, rated voltage is 70kV, and this voltage belongs to the category of the class B insulations such as 66kV, and nargin is reasonable.Rated voltage is the lowest, then be unsatisfactory for
Test voltage requirement, when rated voltage is higher than 140kV, then nargin is excessive.
The operating frequency of resonant capacitance 200 is similar to test voltage frequency, for 30-300Hz, it is therefore preferable to 100-300Hz,
Saturated with the iron core of avoiding transformator.
The shelf depreciation of resonant capacitance 200 is less than 10pC under 120kV, less than 100pC under 140kV.Due to assay device
Normal condition discharge capacity own is at 1000pC, therefore, as long as resonant capacitance 200 self-discharge is less than assay device discharge capacity one
The individual order of magnitude, the impact on measuring just can be ignored.
Wherein the first high side voltage is, i.e. 69.3kV, the second high side voltage is, i.e. 94.5kV, this is the shelf depreciation in the induced voltage test device measuring 750kV grade transformator
Alternative value.
It should be known that the method for the present invention can also be applied to the induced voltage test device of 330kV, 220kV transformator
The measurement of middle shelf depreciation and calibration, the two electric pressure transformer test device principle is complete with 750kV grade transformator
Identical, equipment configuration is the most identical, and simply parameter is different.When measuring for different transformators or calibrate, the most humorous
The capacitance of electric capacity of shaking should be chosen according to the equivalent capacity of tested transformator, enables resonant capacitance and compensation reactor at 100-
Resonance, the state of simulation actual tests is there is in the range of 300Hz.
For 220kV, 330kV transformator, its equivalent capacity is less.Therefore, when the induced voltage for 220kV transformator
When in assay device, shelf depreciation measures and calibrates, resonant capacitance capacity is 0.2-0.3 μ F, preferably 0.25 μ F.First
High side voltage is 11kV, and described second high side voltage is 15kV.
When calibrating for 330kV transformator, resonant capacitance capacity desirable 0.2-0.5 μ F, preferably 0.35 μ F.
First high side voltage is 38.5kV, and described second high side voltage is 52.5kV.
It should be known that the method can also be applied in the induced voltage test device of 330kV, 220kV transformator local
The measurement of electric discharge and calibration, the two electric pressure transformer test device principle is identical with 750kV grade transformator, if
Standby configuration is the most identical, and simply parameter is different.When calibrating for different transformators, the capacitance of corresponding resonant capacitance
Should choose according to the equivalent capacity of tested transformator, enable resonant capacitance and compensation reactor to send out in the range of 100-300Hz
Raw resonance, the state of simulation actual tests.
Finally it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention,
Although being described in detail the present invention with reference to previous embodiment, for a person skilled in the art, it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent.
All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's
Within protection domain.
Claims (9)
1. a method for shelf depreciation in measuring transformer induced voltage test device, described assay device includes testing transformation
Device, compensation reactor and measurement potentiometer, described compensation reactor and measurement potentiometer are connected in parallel on the high-pressure side of testing transformer,
Described measurement potentiometer at least two electric capacity arms are in series, and one of them is high-voltage capacitance arm, and another is low-voltage capacitance
Arm, and this assay device is for carrying out induced voltage test to outside testing transformer, it is characterised in that:
Step one a: resonant capacitance in parallel at the two ends of compensation reactor, the capacitance of this resonant capacitance becomes with above-mentioned test
The equivalent capacitance value of depressor is equal, and described resonant capacitance can occur in 100-300Hz frequency range with compensation reactor
Resonance；
Step 2: electrically connect a detection impedance in the junction of two electric capacity arms, the input electrical connection of described detection impedance
Between two electric capacity arms, the outfan of described detection impedance electrically connects instrument for measuring partial discharge, utilizes this shelf depreciation instrument to survey
Shelf depreciation in amount assay device；
Step 3: power testing transformer, external ac power source accesses the low-pressure side of testing transformer by variable-frequency power sources；
Step 4: adjust the electric voltage frequency of variable-frequency power sources output, make compensation reactor and resonance capacitor loop resonance；
Step 5: the voltage of elevated external alternating current power supply, the high side voltage selecting now testing transformer is the first high-pressure side
Voltage, keeps a period of time, measures now partial discharge quantity；
Step 6: continue elevated external AC supply voltage on the basis of step 5, select the high pressure of now testing transformer
Side voltage is the second high side voltage, keeps a period of time, measures now partial discharge quantity；
Compensation reactor includes at least one compensation reactor.
The method of shelf depreciation in measuring transformer induced voltage test device the most according to claim 1, its feature exists
In: in above-mentioned steps five and step 6, voltage hold-time is one minute.
The method of shelf depreciation, its feature in measuring transformer induced voltage test device the most according to claim 1 and 2
It is: described resonant capacitance shelf depreciation under the conditions of operating frequency is 30-300Hz and voltage is 120kV is less than 10pC.
The method of shelf depreciation in measuring transformer induced voltage test device the most according to claim 3, its feature exists
In: during for the transformer induction voltage test of 750kV, the capacitance of described resonant capacitance is 1.8 μ F-2.2 μ F, described first
High side voltage is 69.3kV, and described second high side voltage is 94.5kV.
The method of shelf depreciation in measuring transformer induced voltage test device the most according to claim 4, its feature exists
In: the capacitance of described resonant capacitance is 2 μ F.
The method of shelf depreciation in measuring transformer induced voltage test device the most according to claim 3, its feature exists
In: during transformer induction voltage test at 220kV, the capacitance of described resonant capacitance is 0.2-0.3 μ F；Described first high pressure
Side voltage is 11kV, and described second high side voltage is 15kV.
The method of shelf depreciation in measuring transformer induced voltage test device the most according to claim 6, its feature exists
In: the capacitance of described resonant capacitance is 0.25 μ F.
The method of shelf depreciation in measuring transformer induced voltage test device the most according to claim 3, its feature exists
In: during transformer induction voltage test at 330kV, the capacitance of described resonant capacitance is 0.2-0.5 μ F, described first high pressure
Side voltage is 38.5kV, and described second high side voltage is 52.5kV.
The method of shelf depreciation in measuring transformer induced voltage test device the most according to claim 8, its feature exists
In: the capacitance of described resonant capacitance is 0.35 μ F.
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| CN103605058A (en) * | 2013-12-03 | 2014-02-26 | 山东电力设备有限公司 | Device for carrying out partial discharge tests simultaneously on multiple sets of transformers |
| CN103941125B (en) * | 2014-04-23 | 2017-03-29 | 南方电网科学研究院有限责任公司 | A kind of CURRENT DISTRIBUTION experimental rig and test method |
| CN104316854A (en) * | 2014-11-06 | 2015-01-28 | 国网上海市电力公司 | Variable-frequency resonance testing circuit |
| CN106501696B (en) * | 2016-10-19 | 2019-09-06 | 云南电网有限责任公司电力科学研究院 | A kind of 500kV high-voltage shunt reactor scene local discharge test system and method |
| 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 |
| CN107271869B (en) * | 2017-06-30 | 2020-02-07 | 国家电网公司 | High-altitude area 750kV parallel reactor partial discharge test method |
| CN108152694A (en) * | 2018-02-01 | 2018-06-12 | 清华大学 | A kind of GIS disc insulators detection method for local discharge |
| CN109001563A (en) * | 2018-06-20 | 2018-12-14 | 国网安徽省电力有限公司滁州供电公司 | A kind of line measurement method and system |
| CN110988772A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Check-up comparison circuit of ultraviolet imager |
| CN110988773B (en) * | 2019-12-19 | 2021-05-11 | 国网山西省电力公司电力科学研究院 | Verification comparison method of ultraviolet imager |
| CN113064026A (en) * | 2021-03-01 | 2021-07-02 | 国网甘肃省电力公司电力科学研究院 | Ultra-high voltage super-large capacity transformer long-time induction voltage test device |
| CN113138323B (en) * | 2021-03-12 | 2024-04-19 | 深圳供电局有限公司 | Partial discharge type recognition device |
| CN115047302B (en) * | 2022-08-15 | 2022-12-30 | 国网江西省电力有限公司电力科学研究院 | Cable series resonance partial discharge detection system and method based on double transformers |
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| JPS63101775A (en) * | 1986-10-20 | 1988-05-06 | Hitachi Ltd | Ac high voltage generator |
| CN101201363A (en) * | 2007-12-14 | 2008-06-18 | 湖北省电力试验研究院 | Current conversion transformer induction pressure test supply apparatus and method for measurement of partial discharge thereof |
| CN201203633Y (en) * | 2008-06-16 | 2009-03-04 | 湖北省电力试验研究院 | Power supply device for controllable inductor induction voltage-resistant experiment |
| CN102175956B (en) * | 2011-02-17 | 2012-10-10 | 甘肃电力科学研究院 | Long duration induction voltage withstand test device of ultrahigh-voltage transformer |
| CN102142779A (en) * | 2011-03-15 | 2011-08-03 | 荣信电力电子股份有限公司 | Novel transformer test power supply |
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