CN107449987B - Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open - Google Patents
Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open Download PDFInfo
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- CN107449987B CN107449987B CN201710769923.7A CN201710769923A CN107449987B CN 107449987 B CN107449987 B CN 107449987B CN 201710769923 A CN201710769923 A CN 201710769923A CN 107449987 B CN107449987 B CN 107449987B
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- 238000010998 test method Methods 0.000 title claims abstract description 23
- 238000005516 engineering process Methods 0.000 title claims abstract description 12
- 238000004804 winding Methods 0.000 claims abstract description 119
- 238000012360 testing method Methods 0.000 claims abstract description 70
- 230000007935 neutral effect Effects 0.000 claims abstract description 40
- 238000012956 testing procedure Methods 0.000 claims abstract description 18
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 9
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- 230000000694 effects Effects 0.000 description 5
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- 238000012546 transfer Methods 0.000 description 4
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention discloses a kind of based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open, and it includes middle pressure-low pressure no-load voltage ratio testing procedures to be depressed into neutral point winding D.C. resistance testing procedure in；Medium pressure-low pressure no-load voltage ratio testing procedure are as follows: remove lead at three-phase neutral bushing, remove the earth mat circuit of first winding parallel connection；Temporary changes low-pressure side safety measure simultaneously pulls open main transformer low-pressure side three-phase ground disconnecting link or removes ground line, disconnects ground connection, remove the earth mat circuit of secondary winding parallel connection；Any one phase low pressure winding wiring is removed simultaneously, opens Angle connection, removes other two-phase winding loops of secondary winding parallel connection；No-load voltage ratio test is carried out finally by no-load voltage ratio tester.
Description
Technical field
The present invention relates to transformer high-voltages to test field, specifically, in particular to 750 kv transformers transfer the files and transfer the files
Experiment work afterwards.
Background technique
Power transformer is one of the capital equipment of transmission distribution electric energy in electric system, is undertaken a certain voltage change phase
The effect of the different voltage of same another or several numerical value.In order to meet the variation of network load and voltage, transformer need to be fitted
The adjustment of Shi Jinhang operational taps.Since 750 kv transformer voltages are high, capacity is big, select single-phase self-coupling formula without excitation
Structure.The gear adjustment of off circuit tap changing transfor mer needs to carry out under power failure.The variation of gear means winding connection
Changed, since off circuit tap changing transfor mer gear can only be judged by the mechanical instruction of equipment pressure regulating device itself, because
There are actual-gears and instruction gear not to be inconsistent for this, the risk of winding joint poor contact；If actual-gear is not inconsistent with instruction gear,
After electrification can not matching system voltage and load, serious person will cause power grid paralysis；And winding joint poor contact can make to contact
Resistance increases, and fever is generated under the action of electric current, causes insulation dissolved gas in oil content constantly to increase, dielectric strength declines most
It causes to puncture eventually, cause damages to equipment and the stabilization of power grids.For the generation for avoiding such accident, need after gear adjusts to it
Carry out the test of electric property verifying.According to the requirement of " 18 great anti-accident measures of power grid of State Grid Corporation of China " 9.4.1:
Off circuit tap changer is after changing tap position, it is necessary to which measurement uses the D.C. resistance and no-load voltage ratio tapped.
For exclusive PCR, the accuracy of guarantee electrical test data, previous electrical test needs are being torn open in tested device
Except being carried out under conditions of a lead.750 kv transformer volumes are big, sleeve position is high, and about 13 meters of bushing distance away the ground,
Lead is the bis- division aluminum conductors of 1600mm2；About 7 meters of medium voltage side distance away the ground, lead is the bis- division aluminum conductors of 1440mm2；It is high, in
Lead dismounting in side is pressed to need to configure crane and high altitude vehicle cooperation dismounting, the average phase transformer lead dismounting time is about 3 hours.
Transformer work power off time of transferring the files is typically only 1-2 days, in the nervous activity duration, when removing fixture wire and occupying a large amount of
Between, prolonged high altitude operation means high operating risk, meanwhile, frequent detaching equipment also can will cause lead to fitting
Abrasion even deforms.
By us specifically the study found that 750 kv transformers are YNd11, neutral-point solid ground connection type, change
After depressor has a power failure, safety measure need to be arranged, cloth postpones high, medium and low three side of transformer and passes through ground line or grounding switch ground connection
(Fig. 1).Overwhelming majority no-load voltage ratio tester measuring principle is bridge method (Fig. 2) at present, that is, passes through the primary side in subject transformer
Making alive U1 adjusts resistance R1, refers to galvanometer then in Circuit Fault on Secondary Transformer since electromagnetic induction principle induces voltage U2
Zero, voltage ratio K is obtained by series loop voltage divider principle simple computation, is can be found that by above-mentioned measuring principle figure accurately to survey
Voltage ratio K is measured, cannot and there are other circuits in first and second side of transformer, and pressure-low pressure no-load voltage ratio is tested in actually carrying out
When, first winding be in be depressed into neutral point winding, secondary winding is low pressure winding.It is not removing a lead and is not changing safety
In the case where measure, since middle pressure, neutral point are grounded, first winding parallel connection earth mat；Low-pressure side is Angle connection and connects simultaneously
Ground, secondary winding parallel connection earth mat and other two-phase low pressure windings, other circuits in parallel cause the voltage and current signal for being tested winding
It changes, test data is caused deviation occur.
The test of overwhelming majority D.C. resistance is all made of digital direct current resistance meter (Fig. 3) at present, successively passes through pressure stabilizing
Power supply EN and constant-current supply IN gives tested winding charging, after test loop transient process, transformer winding and circuit string
The measuring resistance of connection all passes through the same electric current IN, and at this time according to the characteristic of series loop, voltage is than being resistance ratio, known
The resistance value and precise measurement measuring resistance and transformer of measuring resistance be tested after the voltage at winding both ends can calculate it is tested around
The D.C. resistance of group is can be found that when being depressed into the test of neutral point winding D.C. resistance in progress by above-mentioned measuring principle figure as energy
Accurately measure the D.C. resistance of winding, it is to be ensured that in measurement circuit cannot other in parallel circuits, otherwise will lead to measured value is
The parallel value of the two；It is simultaneously guarantee test safety, non-tested winding will guarantee to open a way.And pressure-neutral point in actually carrying out
When D.C. resistance is tested, in the case where not removing a lead and not changing safety measure, since middle pressure, neutral point connect
Earth mat can be coupled in parallel in measurement circuit by ground, first winding parallel connection earth mat if directly measuring, the direct current measured
Resistance value is the parallel value of the D.C. resistance of winding actual DC resistance value and earth mat, and the result measured and true value is caused to occur
Deviation；Low-pressure side is Angle connection and ground connection simultaneously, is not also able to satisfy the requirement of open circuit
Summary of the invention
It is based on not tearing open in view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing one kind
The test method of transferring the files of 750 kv transformer high pressure lead technologies, by not removing 750 kv transformers height, medium voltage side draws
Line is completed to test after transferring the files in the case where removing low-pressure side lead less.This method greatly shortens test period, reduces existing
The operating risk of field, has saved a large amount of human and material resources, financial resources cost input.
In order to achieve the above object, the present invention is achieved by the following scheme:
Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open, surveyed comprising middle pressure-low pressure no-load voltage ratio
Try is depressed into neutral point winding D.C. resistance testing procedure in suddenly；
Medium pressure-low pressure no-load voltage ratio testing procedure are as follows: remove lead at three-phase neutral bushing, it is in parallel to remove first winding
Earth mat circuit；Temporary changes low-pressure side safety measure simultaneously pulls open main transformer low-pressure side three-phase ground disconnecting link or removes ground line,
Ground connection is disconnected, the earth mat circuit of secondary winding parallel connection is removed；Any one phase low pressure winding wiring is removed simultaneously, opens angular company
It connects, removes other two-phase winding loops of secondary winding parallel connection；No-load voltage ratio test is carried out finally by no-load voltage ratio tester；
Medium pressure is to neutral point winding D.C. resistance testing procedure are as follows: removes lead at three-phase neutral bushing, removes
The earth mat circuit of first winding parallel connection；Temporary changes low-pressure side safety measure simultaneously, pulls open main transformer low-pressure side three-phase ground disconnecting link
Or ground line is removed, ground connection is disconnected, the earth mat circuit of secondary winding parallel connection is removed；Any one phase low pressure winding is removed simultaneously to connect
Line opens Angle connection, it is ensured that low-pressure side winding is in open-circuit condition；It is carried out finally by digital direct current resistance meter straight
Leakage resistance test.
As a kind of preferred embodiment of the invention: passing through change in medium pressure-low pressure transformation no-load voltage ratio testing procedure
Than tester carry out no-load voltage ratio test refer to: by subject transformer primary side making alive U1, then Circuit Fault on Secondary Transformer by
Voltage U2 is induced in electromagnetic induction principle, resistance R1 is adjusted, makes galvanometer nulling, simply counted by series loop voltage divider principle
Calculation obtains voltage ratio K, is can be found that by above-mentioned measuring principle figure as that can accurately measure voltage ratio K；
Medium pressure is carried out into neutral point winding D.C. resistance testing procedure by digital direct current resistance meter
D.C. resistance test refers to: successively by regulated power supply EN and constant-current supply IN to tested winding charging, when test loop transition
After process, the measuring resistance of transformer winding and circuit in series all passes through the same electric current IN, at this time according to series loop
Characteristic, voltage than being resistance ratio, the resistance value and precise measurement measuring resistance and transformer of known measuring resistance it is tested around
The D.C. resistance of tested winding can be calculated after the voltage at group both ends, and the test of neutral point winding D.C. resistance is depressed into progress.
As a kind of preferred embodiment of the invention: 750 kv transformer is single-phase self-coupling formula without excitation transformation
Device.
As a kind of preferred embodiment of the invention: 750 kv transformer is YNd11, neutral-point solid ground
Connection type.
As a kind of preferred embodiment of the invention: also comprising pressure-low pressure no-load voltage ratio testing procedure and middle pressure in commission
Transformer is had a power failure before to neutral point winding D.C. resistance testing procedure, safety measure is arranged after power failure, cloth postpones transformer
High, medium and low three side passes through the step of ground line or grounding switch ground connection.
The medicine have the advantages that
1, test of transferring the files is carried out using method of the invention, it is only necessary to remove main transformer three-phase neutral bushing lead and a phase master
It is lower and presses winding casing tube lead that can carry out correlation test work, and previous experiment work needs to remove main transformer three-phase high-low pressure
Three sides amount to 15 leads, at least need to configure the people an of crane, a high altitude vehicle and 3 times of new type test methods every time
Member, new type test method has saved a large amount of time, human and material resources cost in contrast, effectively reduces high altitude operation wind
Danger, while reducing to the unnecessary abrasion of fitting.
2, by theoretical research and date comprision, single-phase self-coupling formula is being carried out using test method of transferring the files of the invention
Transformer is transferred the files in experiment work, it is only necessary to pressure-low pressure no-load voltage ratio in measurement, in be depressed into neutral point winding D.C. resistance and can have effect
The good tap switch physical location simultaneously of card off circuit tap changer contact is consistent with indicating positions, it is compared with the past it is reasonable, have
Effect reduces test number (TN).
Detailed description of the invention
Fig. 1 is the transformer connection schematic diagram of the prior art, is had a power failure it illustrates main transformer and after arrangement safety measure
Wiring effect；
Fig. 2-1 is the no-load voltage ratio tester schematic diagram of the prior art；
Fig. 2-2 is the no-load voltage ratio test schematic of the prior art (before taking out stitches)；
Fig. 2-3 is no-load voltage ratio test schematic of the invention (after taking out stitches)；
Fig. 2-4 is that no-load voltage ratio of the invention tests wiring diagram；
Fig. 3-1 is the instrument for measuring DC resistance schematic diagram of the prior art；
Fig. 3-2 is the D.C. resistance test schematic of the prior art (before taking out stitches)；
Fig. 3-3 is D.C. resistance test schematic of the invention (after taking out stitches)；
Fig. 3-4 is that D.C. resistance of the invention tests wiring diagram；
Fig. 4 is the schematic diagram removed using the lead that the present invention transfer the files when testing.
Description of symbols:
LA: A phase；LB: B phase；LC: C phase；
A:A phase high-voltage winding；X:A phase neutral point winding；A:A phase low pressure winding head end；X:A phase low pressure winding tail end；Am:
Winding head end is pressed in A phase；
B:B phase high-voltage winding；Y:B phase neutral point winding；B:B phase low pressure winding head end；Y:B phase low pressure winding tail end；Bm:
Winding head end is pressed in B phase；
C:C phase high-voltage winding；Z:C phase neutral point winding；C:C phase low pressure winding head end；Z:C phase low pressure winding tail end；Cm:
Winding head end is pressed in C phase.
Specific embodiment
The specific embodiment of the invention is described with reference to the accompanying drawings and embodiments:
As shown, it illustrates a specific embodiment of the invention, as shown, disclosed by the invention be based on not tearing open
The test method of transferring the files of 750 kv transformer high pressure lead technologies, by not removing 750 kv transformers height, medium voltage side
Lead is completed to test after transferring the files in the case where removing low-pressure side lead less.This method greatly shortens test period, reduces
The operating risk at scene, has saved a large amount of human and material resources, financial resources cost input.
We are according to the research to single-phase self-coupling formula without exciting transformer structure note that the adjustment of gear only changes
Medium voltage side winding connection, other winding connections do not change, therefore we need to only verify the related electric of medium voltage side winding
Parameter, the i.e. correctness of verifying gear ensure that tap switch contact is good simultaneously, therefore can carry out the middle pressure of high pressure-or middle pressure-
Low pressure no-load voltage ratio test, high pressure to it is middle pressure winding or in be depressed into neutral point winding D.C. resistance test.From safety and implementation
Comprehensively consider in complexity, actual test Scheme Choice of the invention: 1, middle pressure-low pressure no-load voltage ratio test.2, neutrality is depressed into
Point winding D.C. resistance test.
In order to realize no-load voltage ratio test more properly and securely, the present invention removes lead at three-phase neutral bushing, removes
The earth mat circuit of first winding parallel connection；Temporary changes low-pressure side safety measure simultaneously, pulls open main transformer low-pressure side three-phase ground disconnecting link
Or ground line is removed, ground connection is disconnected, the earth mat circuit of secondary winding parallel connection is removed；Any one phase low pressure winding is removed simultaneously to connect
Line opens Angle connection, removes other two-phase winding loops of secondary winding parallel connection, test connection such as Fig. 2-4.
In order to realize D.C. resistance test more properly and securely, the present invention removes lead at three-phase neutral bushing,
Remove the earth mat circuit of first winding parallel connection；Temporary changes low-pressure side safety measure simultaneously, pulls open main transformer low-pressure side three-phase ground
Disconnecting link removes ground line, disconnects ground connection, removes the earth mat circuit of secondary winding parallel connection；Any one phase low pressure winding is removed simultaneously
Angle connection is opened in wiring, it is ensured that low-pressure side winding is in open-circuit condition, and the accurate and reliable of test data is effectively ensured, test
Wiring diagram such as Fig. 3-4.
In summary the test principle and requirement of no-load voltage ratio and D.C. resistance, scene of the invention take dismounting main transformer
The lead of three-phase neutral bushing, remove any one phase main transformer low pressure winding low-tension bushing lead, while temporarily pulling open master
Low pressure side three-phase ground disconnecting link or dismounting ground line (as shown in Figure 4) are met under the premise of guaranteeing operating personnel's safety
Test request.Scene has carried out relevant test job by this method, and with the test data of conventional dismounting lead into
Go comparison, test data no significant difference, and safety and steady is run after putting equipment in service electrification, and it is novel to further demonstrate the set
The reliability and accuracy of test method.Specific experiment data are as shown in the table；We carry out three substations under administration
Test, every group of test passes through conventional test methodologies and test method of the invention carries out test of transferring the files, experimental result respectively
It is as follows:
As seen from the above table, the mistake between the test result and precision and conventional test methodologies of test method of transferring the files of the invention
Difference is very small；Meet the regulation of electric system；But three times of working efficiency of the invention really conventional test methodologies；It saves significantly
Manpower and time have been saved, power off time and security risk are reduced.
Compared with the prior art, the present invention has the following advantages:
1, only need dismounting main transformer three-phase neutral bushing lead and a phase main transformer low pressure winding casing lead that can carry out phase
Experiment work is closed, and previous experiment work needs to remove three side of main transformer three-phase high-low pressure and amounts to 15 leads, at least needs every time
The personnel an of crane, a high altitude vehicle and 3 times of new type test methods are configured, new type test method is saved in contrast
A large amount of time, human and material resources cost, high altitude operation risk is effectively reduced, while reducing to the unnecessary mill of fitting
Damage.
2, it by theoretical research and date comprision, transfers the files in experiment work carrying out single-phase self-coupling formula transformer, only
Pressure-low pressure no-load voltage ratio in need to measuring, in be depressed into neutral point winding D.C. resistance can effectively to verify off circuit tap changer contact good
Good tap switch physical location simultaneously is consistent with indicating positions, it is compared with the past it is reasonable, be effectively reduced test number (TN).
To sum up, the mentality of designing in specific embodiments of the present invention is as follows:
(1) 750 kv transformer is that YNd11, neutral-point solid ground connection type need to arrange peace after transformer has a power failure
Full measure, cloth postpone high, medium and low three side of transformer and pass through ground line or grounding switch ground connection, as shown in Figure 1；
(2) most no-load voltage ratio tester measuring principles are bridge method at present, as shown in Fig. 2-1, by subject transformation
The primary side making alive U1 of device adjusts resistance R1, makes then in Circuit Fault on Secondary Transformer since electromagnetic induction principle induces voltage U2
Galvanometer nulling obtains voltage ratio K by series loop voltage divider principle simple computation.
It is can be found that by above-mentioned measuring principle figure as voltage ratio K can be accurately measured, it cannot in first and second side of transformer
And there are other circuits.And if pressure-low pressure no-load voltage ratio test (Fig. 2-in being carried out in the case where not changing safety measure and removing lead
2, by taking A phase as an example), since middle pressure, neutral point are grounded, first winding parallel connection earth mat circuit；Low-pressure side is Angle connection simultaneously
And be grounded, secondary winding other two-phase low pressure windings of parallel connection and earth mat circuit cause the voltage and current signal for being tested winding to occur
Variation, causes test data deviation occur.It realizes correct test, interference circuit (Fig. 2-2 dotted portion) should be disconnected.
In conjunction with actual conditions, neutral point lead is removed, removes the earth mat circuit of first winding parallel connection；Secondly, temporary changes
Low-pressure side safety measure pulls open step down side three-phase ground disconnecting link or removes ground line, disconnects ground connection, remove secondary winding
Earth mat circuit in parallel；Any one phase low pressure winding wiring is removed simultaneously, opens Angle connection, removes secondary winding parallel connection its
His two-phase winding loop, principle signal such as Fig. 2-3, tests wiring such as Fig. 2-4；
Remaining two-phase no-load voltage ratio test similarly, therefore, to realize in the correct test of pressure-low pressure no-load voltage ratio, transformer need to be pulled open
In the case where low-pressure side three-phase ground disconnecting link or dismounting ground line, removes three-phase neutral point lead and any one phase low pressure winding is drawn
Line.
(3) most D.C. resistance tests are all made of digital direct current resistance meter (3-1) at present, and instrument successively leads to
Regulated power supply EN and constant-current supply IN is crossed to tested winding charging, after test loop transient process, transformer winding and
The measuring resistance of circuit in series all passes through the same electric current IN, and at this time according to the characteristic of series loop, voltage ratio is resistance ratio,
It can be calculated after the resistance value and precise measurement measuring resistance and transformer of known measuring resistance are tested the voltage at winding both ends
The D.C. resistance RX of tested winding.
It is can be found that by the measuring principle figure of Fig. 3-1 to be depressed into the D.C. resistance of neutral point winding in capable of accurately measuring,
Need to ensure to measure in circuit cannot other in parallel circuits, otherwise will lead to the parallel value that measured value both is；It is simultaneously guarantee examination
Safety is tested, non-tested winding will guarantee to open a way.And if (Fig. 3-2, with A in the case where not changing safety measure and removing lead
For phase), since middle pressure, neutral point are grounded, first winding parallel connection earth mat causes the result measured and true value to occur inclined
Difference；Low-pressure side is that Angle connection constitutes circuit simultaneously.It realizes correct security measurement, tested winding interference circuit (figure should be disconnected
At 3-2 dotted line), and guarantee that low-pressure side is opened a way.
In conjunction with actual conditions, lead at dismountable three-phase neutral bushing removes the earth mat circuit of first winding parallel connection；Together
When temporary changes low-pressure side safety measure, pull open main transformer low-pressure side three-phase ground disconnecting link or remove ground line, disconnect ground connection, simultaneously
Any one phase low pressure winding wiring is removed, opens Angle connection, it is ensured that low-pressure side winding is in open-circuit condition, and test is effectively ensured
Accurate and reliable, the test wiring of data
Remaining two-phase D.C. resistance is tested similarly, therefore, to realize in be depressed into the D.C. resistance of neutral point winding and correctly survey
Examination in the case where need to pulling open step down side three-phase ground disconnecting link or removing ground line, is removed three-phase neutral point lead and is appointed
It anticipates a phase low pressure winding lead.
(4) therefore, to meet the test request of no-load voltage ratio and D.C. resistance in testing program, step down side need to pulled open
In the case where three-phase ground disconnecting link or dismounting ground line, three-phase neutral point lead and any one phase low pressure winding (totally four) are removed
Lead (Fig. 4)
Smoothly 17, Xinjiang, 750 kv substations complete transformer tune to test method through the invention at present
Whole gear and experiment work, test data is accurate and reliable, equal safe and stable operation after putting equipment in service.
By this new type test method, primary work at least 6000 yuan/time of save the cost of transferring the files that have a power failure, Xinjiang has altogether now
28 groups of transformers will save 33.6 ten thousand yuan if every group of transformer is transferred the files 2 times every year every year；In addition, new type test method also contracts
Short power off time, while avoiding potential various vehicle drivings, high altitude operation risk.And such new type test method
Using any economic input is not necessarily to, it is truly realized cost efficiency.
The preferred embodiment for the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes, these variations are related to the relevant technologies well-known to those skilled in the art, these both fall within the invention patent
Protection scope.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (5)
1. based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open, it is characterised in that: include middle pressure-
Low pressure no-load voltage ratio testing procedure is depressed into neutral point winding D.C. resistance testing procedure in；
Medium pressure-low pressure no-load voltage ratio testing procedure are as follows: remove lead at three-phase neutral bushing, remove the ground of first winding parallel connection
Net circuit；Temporary changes low-pressure side safety measure simultaneously pulls open main transformer low-pressure side three-phase ground disconnecting link or removes ground line, disconnects
Ground connection removes the earth mat circuit of secondary winding parallel connection；Any one phase low pressure winding wiring is removed simultaneously, opens Angle connection, is moved
Except other two-phase winding loops of secondary winding parallel connection；No-load voltage ratio test is carried out finally by no-load voltage ratio tester；
Medium pressure is to neutral point winding D.C. resistance testing procedure are as follows: removes lead at three-phase neutral bushing, removes primary
The earth mat circuit of winding parallel；Temporary changes low-pressure side safety measure simultaneously, pulls open main transformer low-pressure side three-phase ground disconnecting link or tears open
Except ground line, ground connection is disconnected, removes the earth mat circuit of secondary winding parallel connection；Any one phase low pressure winding wiring is removed simultaneously, is beaten
Open Angle connection, it is ensured that low-pressure side winding is in open-circuit condition；Direct current is carried out finally by digital direct current resistance meter
Resistance test.
2. special as described in claim 1 based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open
Sign is: in medium pressure-low pressure transformation no-load voltage ratio testing procedure by no-load voltage ratio tester carry out no-load voltage ratio test referring to: by
Be tested the primary side making alive U1 of transformer, then in Circuit Fault on Secondary Transformer since electromagnetic induction principle induces voltage U2, adjustment
Resistance R1 makes galvanometer nulling, obtains voltage ratio K by series loop voltage divider principle simple computation；
Medium pressure carries out direct current by digital direct current resistance meter into neutral point winding D.C. resistance testing procedure
Resistance test refers to: successively tested winding charging is given by regulated power supply EN and constant-current supply IN, when test loop transient process
After, the measuring resistance of transformer winding and circuit in series all passes through the same electric current, at this time according to the characteristic of series loop,
Voltage is tested winding both ends than being resistance ratio, in the resistance value and precise measurement measuring resistance and transformer of known measuring resistance
The D.C. resistance of tested winding can be calculated after voltage, and the test of neutral point winding D.C. resistance is depressed into progress.
3. special as described in claim 1 based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open
Sign is: 750 kv transformer is single-phase self-coupling formula without exciting transformer.
4. special as described in claim 1 based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open
Sign is: 750 kv transformer is YNd11, neutral-point solid ground connection type.
5. special as described in claim 1 based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open
Sign is: also comprising pressure-low pressure no-load voltage ratio testing procedure in commission and in be depressed into neutral point winding D.C. resistance testing procedure it
It is preceding that transformer has a power failure, safety measure is arranged after power failure, cloth postpones high, medium and low three side of transformer and passes through ground line or ground connection
The step of disconnecting link is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710769923.7A CN107449987B (en) | 2017-08-31 | 2017-08-31 | Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710769923.7A CN107449987B (en) | 2017-08-31 | 2017-08-31 | Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open |
Publications (2)
| Publication Number | Publication Date |
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| CN107449987A CN107449987A (en) | 2017-12-08 |
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| CN112433105B (en) * | 2020-10-27 | 2024-02-09 | 吴江变压器有限公司 | Transformer semi-finished product transformation ratio measuring method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354418A (en) * | 2008-09-22 | 2009-01-28 | 河南省电力公司商丘供电公司 | Power transformer test method without disconnecting wire |
| CN101769961A (en) * | 2008-12-30 | 2010-07-07 | 上海金炫建设工程有限公司 | Method for testing direct current resistance of large transformer without disconnecting lead |
| CN102095954A (en) * | 2010-12-17 | 2011-06-15 | 青海电力科学试验研究院 | Preventive test method for capacitance voltage transformer free from dismounting lead |
| CN103336186A (en) * | 2012-12-18 | 2013-10-02 | 辽宁省电力有限公司检修分公司 | Method for testing transformer equipment without disassembling lead |
| CN105974229A (en) * | 2016-05-06 | 2016-09-28 | 国网山东省电力公司青州市供电公司 | Disconnection-free testing method for high voltage electric equipment in transformer substation |
-
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- 2017-08-31 CN CN201710769923.7A patent/CN107449987B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354418A (en) * | 2008-09-22 | 2009-01-28 | 河南省电力公司商丘供电公司 | Power transformer test method without disconnecting wire |
| CN101769961A (en) * | 2008-12-30 | 2010-07-07 | 上海金炫建设工程有限公司 | Method for testing direct current resistance of large transformer without disconnecting lead |
| CN102095954A (en) * | 2010-12-17 | 2011-06-15 | 青海电力科学试验研究院 | Preventive test method for capacitance voltage transformer free from dismounting lead |
| CN103336186A (en) * | 2012-12-18 | 2013-10-02 | 辽宁省电力有限公司检修分公司 | Method for testing transformer equipment without disassembling lead |
| CN105974229A (en) * | 2016-05-06 | 2016-09-28 | 国网山东省电力公司青州市供电公司 | Disconnection-free testing method for high voltage electric equipment in transformer substation |
Non-Patent Citations (1)
| Title |
|---|
| 不拆引线测量500KV自耦变压器套管电容量及介质损耗的方法;张振兴 等;《中国电力》;20140831;第47卷(第8期);21-26 |
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