CN105842541A - Rapid testing apparatus and testing method for large scale transformer's direct current resistance - Google Patents
Rapid testing apparatus and testing method for large scale transformer's direct current resistance Download PDFInfo
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- CN105842541A CN105842541A CN201610223339.7A CN201610223339A CN105842541A CN 105842541 A CN105842541 A CN 105842541A CN 201610223339 A CN201610223339 A CN 201610223339A CN 105842541 A CN105842541 A CN 105842541A
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a rapid testing apparatus and testing method for large scale transformer's direct current resistance. The apparatus comprises a high voltage side testing module and a low voltage side testing module. The high voltage side testing module comprises current sampling resistors RN. The winding in star connection in each phase of a transformer is connected in series with the corresponding current sampling resistor RN. Each current sampling resistor RN and a resistor RX in the corresponding tested winding form a series connected voltage dividing circuit. The voltage testing model in each phase is connected to a voltmeter and the series connected voltage distributing circuit is in series connection to a constant current source. The low voltage testing module comprises a controller, a multi-channel relay and a current and voltage testing module. The controller is connected to the relay and the current and voltage testing module. The two ports of each channel of the relay are connected to the A-phase, B-phase and C-phase windings in star connection at the high voltage side of the transformer, the a-phase, b-phase and c-phase windings in delta connection at the low voltage side of the transformer, and a power supply. The controller is further connected to a display screen. According to the invention, the testing apparatus and the testing method can achieve accurate experiment data, reduce work risk, raise work efficiency and ensure the safety of both people and equipment.
Description
Technical field
The invention belongs to DCR of Transformer rapid testing technology field, be specifically related to a kind of large-scale transformation
Device quick test device for direct-current resistance and method of testing.
Background technology
The measurement of Transformer Winding D.C. resistance, can check the welding quality within winding and winding,
Joint looseness, many defects such as shunting switch loose contact.Weight is served to ensureing that transformer safety is run
Act on.But also it cannot be carried out live testing and on-line monitoring at present, rely primarily on power failure and survey
Examination, is the year project that must do of preventive trial.In transformator all preventive trials project, direct current
The 2/3 of measurement total time time of resistance.
The problem that on-the-spot test at present exists:
1, when existing step down side delta windings carries out D.C. resistance test, delta windings is surveyed
Why inscribe:
1. power system 110kV and above main transformer, low-pressure side is delta connection, is carrying out main transformer
During the test of low-pressure side D.C. resistance, due to the particularity of delta connection, carry out the survey of winding D.C. resistance
The examination time is the longest, and data are difficult to stable, and transformer capacity is the biggest, and this phenomenon is especially prominent.Make survey
The verity of examination data is difficult to ensure that.The most even Transformer Winding is done the judgement made mistake.
The most domestic magnetic assist method test used for delta windings, its wiring is more complicated, easily makes
Become false wiring, the highest to testing crew technical know-how level requirement.Process of the test need frequent thread-changing grasp
Make, increase operating risk.
2, when existing high voltage side of transformer star winding carries out D.C. resistance test, star-connection (YN)
There are the following problems in winding test:
1. main transformer high-pressure side winding is on-load voltage regulation mode, and all gears need to will be surveyed by code regulation
Examination, our test mode is by on-load voltage regulation institutional adjustment high-pressure side winding gear at present, first carries out A
After the D.C. resistance test of phase (1～17 grade) winding, then commutation carries out B phase (17～1 grades) winding
D.C. resistance test, then commutation carry out C phase (1～17 grade) winding D.C. resistance test；Time-consuming long.
2. complete main transformer high-pressure side A, B, C phase winding direct resistance metering, need to frequently adjust load ratio bridging switch
Three single cycles, load ratio bridging switch mechanical wear is big.Increase the oxide-film of tap changer contact to three
The impact of degree of balancing each other.
3., in commutation operating process, need to cut off test loop power supply, winding is discharged, then changes
Phase connection operates, then tests, and the process that winding re-establishes magnetic flux is longer, the longest.
4. during test, electric current passes through generate heat, owing to winding is that single-phase galvanization is tested, respectively during winding
Phase winding temperature is inconsistent, the factor of the size temperature influence of winding resistance, causes test data to exist
Certain deviation.The problems such as the unbalance factor of three-phase dc resistance exceeds standard.
The triple channel principle test mode of the most current domestic employing, owing to during test, neutral point lead portion does not has
Electric current is had to pass through, it is impossible to checking neutral point lead-in wire is the most normal, in addition it is also necessary at least to test mutually by uniphase mode is every
Demonstrate,prove data.
3, when existing high voltage side of transformer star winding carries out D.C. resistance test, its loaded tap-off is opened
Shutting mechanism case pressure regulation gear shift there is problems in that
1., during the winding D.C. resistance of testing high voltage side, a people is needed to carry out high pressure in on-load voltage regulation mechanism one end
The operation of side winding gear shift, to coordinate other end tester to carry out test operation, scene is to sing by exhaling
After mode confirms gear, tester tests again, and ergonomic is low.
2. test operation end is carried out not at the three unities due to on-load voltage regulation mechanism end and tester, on-the-spot
Be by the way of two ends personnel exhale and sing, confirm gear after, then tested by tester, easily deposit
Test leakage, repeat survey phenomenon, waste time and energy.
Summary of the invention
The technical problem to be solved in the present invention is: for the technical problem of above-mentioned existence, it is provided that a kind of large-scale
DCR of Transformer device for quick testing and method of testing, solve at present Transformer Winding D.C. resistance
The ergonomic that measurement brings is low, operating risk is high, time-consuming length and the impact on test data, it is ensured that examination
Test the accuracy of data, reduce operating risk, improve operation work efficiency, it is ensured that the person and equipment safety.
The technical scheme that the present invention takes is: a kind of direct current resistance of large transformer device for quick testing, bag
Including high-pressure side test module and low-pressure side test module, high-pressure side test module includes current sampling resistor
RN, at A, B, C end series current sample resistance respectively of transformator A, B, C three-phase star winding
RN, current sampling resistor RN form, with every mutually tested winding resistance RX of tested winding, dividing potential drop of connecting
Circuit, is connected respectively to electricity at the current sampling resistor RN two ends of transformator A, B and C three-phase concatenation
Pressure Table V AN, voltmeter VBN and voltmeter VCN, at the transformator tested winding of A, B and C three-phase
Resistance RX two ends are connected respectively to voltmeter VAX, voltmeter VBX and voltmeter VCX, will series connection
Bleeder circuit is concatenated on constant-current source；Low-pressure side test module includes controller, multicircuit relay and electric current
Voltage test module, controller is connected to relay and current/voltage test module, two, the every road of relay
Port is connected to transformer high-voltage star-like side ABC phase winding, low pressure triangle side abc phase winding and power supply,
Controller is also connected to display screen.
Relay includes 1S, 2S, 3S, 4S, 3S, 6S, 7S, 8S, 9S, 10S, 11S and 12
Positive source can be connected with C by S 12 tunnel, 1S, 3S and 5S respectively with A phase, B phase, 2S,
A phase, b phase and c that A phase can be connected respectively by 4S, 6S respectively with 8S, 10S and 12S are connected,
Power cathode can be connected with c with a phase, b phase respectively by 7S, 9S with 11S.
High-pressure side test module also includes a kind of to transformer on-load voltage regulating mechanism long-distance operating device, including
Electric magnet one and electric magnet two, electric magnet one and electric magnet two are fixedly connected on liter downshift button panel, electricity
The movable core one of Magnet one and the movable core two of electric magnet two are the most just to the liter on liter downshift button panel
Shelves button and down-shift button.
Electric magnet one and electric magnet two are connected respectively to upshift press button by control line and down-shift button is opened
Closing, upshift press button and down-shift button switch are connected to power supply, by the long-range upshift connecting power supply
Press button and down-shift button switch, can carry out a liter downshift operation conveniently and efficiently, controls simple, safeguards
Convenient.
Electric magnet one and electric magnet two are connected on liter downshift button panel by clamping and fixing device, and clamping is solid
Determine device include dismountable clamping device and be arranged on the fixed mechanism bottom clamping device, by removable
The gripper mechanism grips unloaded rises downshift button panel, uses fixing device to be fixedly connected by electric magnet, real
Show being rapidly assembled and disassembled of electric magnet, be greatly improved experimental test efficiency.
Clamping device includes the mobile clip of tetragonal body shape fixing hoop and bar shaped, and fixing hoop upper surface sets
Putting fixing hoop head, mobile clip upper surface arranges mobile hoop and left surface arranges guide post, fixing
Hoop and mobile hoop form oat tail groove structure, and mobile clip is telescopically connected to by guide post
In fixing hoop right flank pilot hole, being provided with compression spring in pilot hole, compression spring two ends are supported respectively
Lean against on the Step Shaft of guide post end and on the baffle plate in pilot hole aperture, the compression connected by your guide post
Spring, carries out tension and compression by fixing hoop head and mobile hoop to a liter downshift button panel and fixes, easy to loading and unloading
Fast, it is suitable for the installation rising downshift button panel of different in width size, and simple in construction, fix tightly
Leaning on, on liter downshift button panel, upper-lower position is easy to adjust, it is ensured that the position of electric magnet movable core is accurate.
Fixed mechanism includes that two chutes of channel-section steel shape and two pairs of L-types connect sheet, symmetrical before and after two chutes
Be fixedly connected on fixing hoop, the groove face opposite of two chutes is installed, and every pair connects sheet minor face and is entrenched in
In chute, and using holding screw to fix, every pair connects length of a film limit and is fixedly connected on electric magnet one and electromagnetism
On ferrum two, moved on chute by the connection sheet of L-type so that rise position, left and right on downshift button panel
Putting easy to adjust, it is ensured that the position of electric magnet movable core is accurate, easy to loading and unloading fast connection is reliable,
Registration.
A kind of to transformer on-load voltage regulating mechanism long-distance operating device, also include video monitor, video is supervised
Control instrument is connected to photographic head by cable, and photographic head is arranged at liter downshift button panel, just presses a liter downshift
Gear display lamp on button plate, uses monitoring remote video instrument and photographic head to carry out gear display lamp in real time
Remotely monitoring, thus the remotely operation control that can quickly make Transformer Winding D.C. resistance remotely tries
Test, it is to avoid the man-machine efficacy that remote call-in brings is low and wastes time and energy, it is ensured that the reliability of data,
Connecting on photographic head and have clip, clip is fixed on a liter down-shift button by detachable movable mountings
On plate, connect a liter downshift button panel by the dismountable mode of clip, load and unload more convenient, connect reliable,
Easy to operate, also can be fixed on the load ratio bridging switch mechanism case of different manufacturers, different model.
Photographic head is connected to clip by direction flexible, can take the photograph conveniently and efficiently by adjusting Universal pipe
As the position adjustment of head, adjust the head of relief photographic head just to gear display lamp.
Clip includes two holding pieces and torsion spring, and two holding pieces are installed, in rotary shaft by axisymmetry ground
Being socketed with torsion spring, torsion spring two free end is resisted against two holding piece pressing part interior.
The method of testing of a kind of direct current resistance of large transformer device for quick testing, the method includes following step
Rapid:
(1) high-pressure side D.C. resistance test: by high-pressure side test module by ammeter voltage corresponding for tester
Table is connected to high voltage side of transformer, and at A, B, C end of transformator A, B, C three-phase star winding
Distinguish every mutually tested winding of series current sample resistance RN, current sampling resistor RN and tested winding
Resistance RX composition series connection bleeder circuit, the current voltmeter every phase RN both end voltage of test and electric current,
Record every phase resistance: computing formula is as follows；
(2) low-pressure side D.C. resistance test: by low-pressure side test module by ammeter voltage corresponding for tester
Table is connected to step down side, by controller automatically control multicircuit relay realize high-pressure side winding with
The break-make in the different paths of low-pressure side winding, and loop is connected to power supply, the every phase of low-pressure side can be recorded
Resistance, is calculated can result be shown on display screen by controller.
Beneficial effects of the present invention: compared with prior art, the present invention has a following effect:
(1) present invention is by can measure the high-pressure side test module of high-pressure side D.C. resistance and by control simultaneously
Device automatic control relay processed switching measures the low-pressure side test module of low-pressure side D.C. resistance, it is achieved
The accuracy of test data, reduces operating risk, improves operation work efficiency, it is ensured that the person and equipment safety,
The ergonomic solving to bring Transformer Winding direct current resistance m easurem ent at present is low, operating risk is high, time-consumingly
Length and the impact on test data；
(2) test module in high-pressure side is because using three-phase to measure simultaneously, and transformer neutral point lead portion comprises
In test loop, also demonstrate neutral point lead-in wire the most normal simultaneously, solve current domestic employing three
Under passage principle test mode, it is impossible to checking neutral point lead-in wire is the most normal, in addition it is also necessary to every by uniphase mode
The most at least verifying mutually the drawback of data, owing to being that three-phase is tested simultaneously, and each phase current is produced closes
Becoming magnetic flux is zero, and curent change transient process shortens dramatically, when completing transformator whole gear test
Between be the 1/3 of the single-phase testing time, testing efficiency is greatly improved, time saving and energy saving, simultaneously measure ensure every phase
Winding temperature is consistent, substantially increases measuring accuracy and reliability, decreases the use of contact, decrease
Mechanical wear, reduces the impact on three-phase equilibrium degree of the oxide-film of tap changer contact, and service life is more
Long；
(3) low-pressure side test module can be together in series high and low pressure side energising by controller and relay
Flow measurement measures low pressure winding D.C. resistance, uses same phase and the high pressure winding magnetic assist of same polarity, due to
The number of turn of high pressure winding is many more than low pressure, by means of the number of ampere turns of high pressure winding, makes transformer core satisfy
With, reducing inductance, time constant can be reduced, reach the purpose quickly measured, the present invention is by automatically
The magnetic assist method mode of connection of switching, can be automatically performed thread-changing operation, substitute manually frequently ascend a height operation and
False wiring, improves operation effect, reduce that operating risk and false wiring bring to test error in data
Judgement.
Accompanying drawing explanation
Fig. 1 is the test structural representation of the present invention；
Fig. 2 is the high-pressure side test modular circuit attachment structure schematic diagram of the present invention；
Fig. 3 is the low-pressure side test module control structure schematic diagram of the present invention；
Fig. 4 is the Relay Link Circuit structural representation of Fig. 3；
Fig. 5 is the test Rac electrical block diagram of Fig. 3；
Fig. 6 is the test Rab electrical block diagram of Fig. 3；
Fig. 7 is the test Rbc electrical block diagram of Fig. 3；
Fig. 8 is that the high-pressure side gear replacing of the present invention remotely operates structural representation；
Fig. 9 is the circuit connection structure schematic diagram in Fig. 8；
Figure 10 is the left view structural representation of Fig. 8；
Figure 11 is the liter downshift button panel structural representation in Fig. 8；
Figure 12 is Fig. 8 medium-long range supervising device structural representation；
Figure 13 is clip junction structural representation in Figure 12.
In figure, 1-fixing hoop head, 2-Step Shaft, 3-fixing hoop, 4-compression spring, 5-moves clip,
6-moves hoop, and 7-upshift electric magnet connects sheet, and 8-downshift electric magnet connects sheet, 9-chute, 10-screw
One, 11-screw two, 12-electric magnet one, 13-electric magnet two, 14-upshifts the left line terminals of electric magnet, 15-
The upshift right line terminals of electric magnet, 16-downshifts the left line terminals of electric magnet, and 17-downshifts the right line terminals of electric magnet, 18-
Movable core one, 19-movable core two, 20-control line, 22-upshifts press button, and 23-down-shift button is opened
Closing, 24-rises downshift button panel, and 25-upshifts button, 26-down-shift button, 27-clamping and fixing device, 28-
Guide post, 29-pilot hole, 30-baffle plate, 31-holding screw.
Detailed description of the invention
Below in conjunction with the accompanying drawings and invention is described further by specific embodiment.
As shown in Fig. 1～Figure 13, a kind of direct current resistance of large transformer device for quick testing, including high-pressure side
Test module and low-pressure side test module, high-pressure side test blocks current sample resistance RN, transformator A,
A, B, C end of B, C three-phase star winding series current sample resistance RN, current sampling resistor respectively
Every mutually tested winding resistance RX of RN and tested winding forms bleeder circuit of connecting, transformator A,
The current sampling resistor RN two ends of B and C three-phase concatenation are connected respectively to voltmeter VAN, voltmeter VBN
With voltmeter VCN, it is connected respectively at transformator A, B and C three-phase tested winding resistance RX two ends
Voltmeter VAX, voltmeter VBX and voltmeter VCX, be concatenated into series connection bleeder circuit on constant-current source；
Low-pressure side test module includes controller, multicircuit relay and current/voltage test module, and controller connects
Testing module to relay and current/voltage, it is star-like that two, the every road of relay port is connected to transformer high-voltage
Side ABC phase winding, low pressure triangle side abc phase winding and power supply, use same phase and the height of same polarity
Pressure winding magnetic assist, controller is also connected to display screen.
Relay includes 1S, 2S, 3S, 4S, 3S, 6S, 7S, 8S, 9S, 10S, 11S and 12
Positive source can be connected with C by S 12 tunnel, 1S, 3S and 5S respectively with A phase, B phase, 2S,
A phase, b phase and c that A phase can be connected respectively by 4S, 6S respectively with 8S, 10S and 12S are connected,
Power cathode can be connected with c with a phase, b phase respectively by 7S, 9S with 11S.
High-pressure side test module also includes a kind of to transformer on-load voltage regulating mechanism long-distance operating device, including
Electric magnet 1 and electric magnet 2 13, electric magnet 1 and electric magnet 2 13 be fixedly connected on liter downshift by
On button plate 24, the movable core 1 of electric magnet 1 and the movable core of electric magnet 2 13 2 19 points
The most just to the upshift button 25 on liter downshift button panel 24 and down-shift button 26, use two electric magnet
Movable core is the most just carrying out load ratio bridging switch mechanism case pressure regulation gear shift to high voltage side of transformer star winding
Upshift button and down-shift button, electric magnet is connected to remotely to be controlled a liter downshift, it is achieved that remotely
Operation, efficiently solve in prior art at present Transformer Winding direct current resistance m easurem ent is brought man-machine
Work efficiency is low, operating risk is high, time-consuming length and on test data affect problem, it is ensured that the standard of test data
Really property, reduces operating risk, improves operation work efficiency, it is ensured that the person and equipment safety.
Electric magnet 1 and electric magnet 2 13 are connected respectively to, by control line 20, the press button 22 that upshifts
Switching 21 with down-shift button, upshift press button 22 and down-shift button switch 21 are connected to power supply 23, logical
Cross the long-range upshift press button connecting power supply and down-shift button switch, can lift conveniently and efficiently
Shelves operation, controls simple, easy to maintenance.
Electric magnet 1 and electric magnet 2 13 are connected to a liter downshift button panel 24 by clamping and fixing device 27
On, the binding post of electric magnet 1 is the upshift left line terminals of electric magnet 14 and the upshift right line end of electric magnet
Son 15, the binding post of electric magnet 2 13 is the downshift left line terminals of electric magnet 16 and the downshift right line of electric magnet
Terminal 17, clamping and fixing device 27 includes dismountable clamping device and is arranged on consolidating bottom clamping device
Determine mechanism, rise downshift button panel by dismountable gripper mechanism grips, use fixing device by electric magnet
It is fixedly connected, it is achieved that being rapidly assembled and disassembled of electric magnet, is greatly improved experimental test efficiency.
Clamping device includes the mobile clip 5 of tetragonal body shape fixing hoop 3 and bar shaped, fixing hoop 3 upper end
Face arranges fixing hoop head 1, and mobile clip 5 upper surface arranges mobile hoop 6 and left surface arranges guiding
Bar 28, fixing hoop head 1 and mobile hoop 6 form oat tail groove structure, and mobile clip 5 is by guiding
Bar 28 is telescopically connected in fixing hoop 3 right flank pilot hole 29, is provided with pressure in pilot hole 29
Contracting spring 4, compression spring 4 two ends bear against on guide post 28 end Step Shaft 2 and pilot hole 29
On the baffle plate 30 in aperture, the compression spring connected by your guide post, by fixing hoop head and mobile clip
Head carries out tension and compression fixes a liter downshift button panel, easy to loading and unloading fast, be suitable for the liter of different in width size
The installation of down-shift button plate, and simple in construction, fixed, upper-lower position on liter downshift button panel
Easy to adjust, it is ensured that the position of electric magnet movable core is accurate.
Fixed mechanism includes that two chutes 9 of channel-section steel shape and the upshift electric magnet of two pairs of L-types connect sheet 7 He
Downshift electric magnet connects sheet 8, is fixedly connected on symmetrically on fixing hoop 3 before and after two chutes 9, and two is sliding
The groove face opposite of groove 9 is installed, and every pair of upshift electric magnet connects sheet 7 and connects sheet 8 minor face with downshift electric magnet
Being entrenched in chute, and use holding screw 31 to fix, every pair of upshift electric magnet connects sheet 7 and downshift electricity
Magnet connects the long limit of sheet 8 and is fixedly connected on electric magnet 1 and electric magnet 2 13, by the company of L-type
Contact pin moves on chute so that rise left and right position adjustment on downshift button panel convenient, it is ensured that electromagnetism
The position of ferrum movable core is accurate, easy to loading and unloading fast, connect reliable, registration.
Operating process: power supply 23 takes the self-test instrument electricity of high voltage side of transformer star winding D.C. resistance test
Source, when using upshift operation, switches on power 23, clicks upshift press button 22 and makes its normal opened contact
Connecting, the coil of the electric magnet 1 that power supply passes through the band movable core 1 that control line 20 makes to be connected is charged,
What movable core 1 top was pressed with in on-load shunting switch mechanism case rises the upshift button on downshift button panel, complete
The upshift operation of load ratio bridging switch in pairs；When using downshift operation, switch on power 23, click fall
Shelves press button 21 makes its normal opened contact connect, and power supply makes the band movable core two being connected by control line 20
The coil of the electric magnet 2 13 of 19 is charged, and movable core 2 19 top is pressed with the liter in on-load shunting switch mechanism case
Down-shift button on down-shift button plate, completes the downshift operation to load ratio bridging switch.
A kind of to transformer on-load voltage regulating mechanism long-distance operating device, also include video monitor 32, video
Monitor controller 32 is connected to photographic head 33 by cable, and photographic head 33 is arranged at liter downshift button panel 24,
Just to the gear display lamp 39 on liter downshift button panel 24, photographic head 33 connects and has clip 34, clip
34 are fixed on liter downshift button panel 24 by detachable movable mountings, and photographic head 33 is by universal
Flexible pipe 35 is connected to clip 34, and clip 34 includes that two holding pieces 36 and torsion spring 37, two holding pieces 36 lead to
Cross rotary shaft 38 to install symmetrically, rotary shaft 38 be socketed with torsion spring 37,37 liang of free ends of torsion spring against
Part interior is pressed at two holding pieces 36.
Embodiment 1: in high-pressure side test module, when the test electric current of constant-current source is simultaneously entered the three-phase of parallel connection
After winding, the test electric current sampling resistor RN on transformator A, B, C phase winding respectively produces one
Sampled voltage VN, produces a voltage VX, according to known sample resistance on tested winding resistance RX
The resistance value of RN, by following series resistance voltage division formulas, is counted out each phase winding by counting circuit
DC resistance RX:
It is known resistance by the three-phase of transformator star winding being concatenated respectively a resistance RN, RN,
RN forms dividing potential drop with the tested winding resistance RX of every phase, is recorded RN and RX two respectively by voltmeter
The voltage of end, can try to achieve RX, because using three-phase to measure simultaneously, and transformer neutral point leading part subpackage
It is contained in test loop, also demonstrates neutral point lead-in wire the most normal simultaneously, solve current domestic employing
Under triple channel principle test mode, it is impossible to checking neutral point lead-in wire is the most normal, in addition it is also necessary to by uniphase mode
Every drawback the most at least verifying data, owing to being that three-phase is tested simultaneously, and produced by each phase current
Resultant flux is zero, and curent change transient process shortens dramatically, and completes transformator whole gear test
Time is the 1/3 of single-phase testing time, and testing efficiency is greatly improved, time saving and energy saving, measures simultaneously and ensures often
Phase winding temperature is consistent, substantially increases measuring accuracy and reliability, decreases the use of contact, reduces
Mechanical wear, reduces the impact on three-phase equilibrium degree of the oxide-film of tap changer contact, service life
Longer.
Embodiment 2: in low-pressure side test module, when carrying out the test of Rac D.C. resistance, by main transformer high pressure
Side star-like A, B, C and main transformer low-pressure side a, b, c are connected in figure below corresponding terminal by p-wire,
Connect test power supply.By Programmable Logic Controller, drive controlled member relay.Start and measure loop,
Now contact 1s-4s-6s-8s-11s connect, DC source by positive pole (+) flow through Guan Bi contact arrive
Negative pole (-), complete the measurement of Rac.Actual test circuit relay junction electrical block diagram is the most attached
Shown in Fig. 5, test current flow paths is: (+) (1s) (A phase winding) (BC is in parallel
Winding) (4s6s) 8s a phase winding b phase winding c phase winding (-).
Embodiment 3: in low-pressure side test module, when carrying out the test of Rab D.C. resistance, by main transformer high pressure
Side star-like A, B, C and main transformer low-pressure side a, b, c are connected in figure below corresponding terminal by p-wire,
Connect test power supply.By Programmable Logic Controller, drive controlled member relay, start and measure loop,
Now contact 3s-2s-6s-7s-10s connect, DC source by positive pole (+) flow through Guan Bi contact arrive
Negative pole (-), completing the measurement of Rab, actual test circuit relay junction electrical block diagram is such as
Shown in accompanying drawing 6, test current flow paths is: (+) (3s) (B phase winding) (AC phase is also
Connection winding) (2s6s) 10s b phase winding c phase winding a phase winding (-).
Embodiment: 4: when carrying out the test of Rbc D.C. resistance, by star-like for main transformer high-pressure side A, B, C and
Main transformer low-pressure side a, b, c are connected in figure below corresponding terminal by p-wire, connect test power supply.Logical
Cross Programmable Logic Controller, drive controlled member relay, start and measure loop, now contact
5s-2s-4s-9s-12s connect, DC source by positive pole (+) flow through Guan Bi contact arrive negative pole (-),
Completing the measurement of Rbc, reality tests circuit relay junction electrical block diagram as shown in Figure 7,
Test current flow paths is: (+) (5s) (C phase winding) (AB be in parallel winding) (2s4s)
12s a phase winding c phase winding b phase winding (-).
Embodiment 5: the method for testing of a kind of direct current resistance of large transformer device for quick testing, the method bag
Include following steps:
(1) high-pressure side D.C. resistance test: by high-pressure side test module by ammeter voltage corresponding for tester
Table is connected to high voltage side of transformer, and at A, B, C end of transformator A, B, C three-phase star winding
Distinguish every mutually tested winding of series current sample resistance RN, current sampling resistor RN and tested winding
Resistance RX composition series connection bleeder circuit, the current voltmeter every phase RN both end voltage of test and electric current,
Record every phase resistance: computing formula is as follows；
(2) low-pressure side D.C. resistance test: by low-pressure side test module by ammeter voltage corresponding for tester
Table is connected to step down side, by controller automatically control multicircuit relay realize high-pressure side winding with
The break-make in the different paths of low-pressure side winding, and loop is connected to power supply, use same phase and same polarity
High pressure winding magnetic assist, the every phase resistance of low-pressure side can be recorded, by controller calculate result can be shown
Show on display screen.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited to
In this, any those familiar with the art, can be easily in the technical scope that the invention discloses
Expect change or replace, all should contain within protection scope of the present invention, therefore, the protection of the present invention
Scope should be as the criterion with described scope of the claims.
Claims (10)
1. a direct current resistance of large transformer device for quick testing, it is characterised in that: include that mould is tested in high-pressure side
Block and low-pressure side test module, high-pressure side test module include current sampling resistor RN, transformator A,
A, B, C end of B, C three-phase star winding series current sample resistance RN, current sampling resistor respectively
Every mutually tested winding resistance RX of RN and tested winding forms bleeder circuit of connecting, transformator A,
The current sampling resistor RN two ends of B and C three-phase concatenation are connected respectively to voltmeter VAN, voltmeter VBN
With voltmeter VCN, it is connected respectively at transformator A, B and C three-phase tested winding resistance RX two ends
Voltmeter VAX, voltmeter VBX and voltmeter VCX, be concatenated into series connection bleeder circuit on constant-current source；
Low-pressure side test module includes controller, multicircuit relay and current/voltage test module, and controller connects
Testing module to relay and current/voltage, it is star-like that two, the every road of relay port is connected to transformer high-voltage
Side ABC phase winding, low pressure triangle side abc phase winding and power supply, controller is also connected to display screen.
A kind of direct current resistance of large transformer device for quick testing the most according to claim 1, its feature exists
In: relay includes 1S, 2S, 3S, 4S, 3S, 6S, 7S, 8S, 9S, 10S, 11S and 12
Positive source can be connected with C by S 12 tunnel, 1S, 3S and 5S respectively with A phase, B phase, 2S,
A phase, b phase and c that A phase can be connected respectively by 4S, 6S respectively with 8S, 10S and 12S are connected,
Power cathode can be connected with c with a phase, b phase respectively by 7S, 9S with 11S.
A kind of direct current resistance of large transformer device for quick testing the most according to claim 1, its feature exists
In: high-pressure side test module also includes a kind of to transformer on-load voltage regulating mechanism long-distance operating device, this dress
Put and include electric magnet one (12) and electric magnet two (13), electric magnet one (12) and electric magnet two (13)
Be fixedly connected on liter in downshift button panel (24), the movable core one (18) of electric magnet one (12) and
The movable core two (19) of electric magnet two (13) is the most just to the upshift in liter downshift button panel (24)
Button (25) and down-shift button (26).
A kind of direct current resistance of large transformer device for quick testing the most according to claim 3, its feature exists
In: electric magnet one (12) and electric magnet two (13) by control line (20) be connected respectively to upshift by
Button switch (22) and down-shift button switch (21), upshift press button (22) and down-shift button switch
(21) power supply (23) it is connected to.
A kind of direct current resistance of large transformer device for quick testing the most according to claim 3, its feature exists
In: electric magnet one (12) and electric magnet two (13) are connected to lifting by clamping and fixing device (27)
On shelves button panel (24), clamping and fixing device (27) includes dismountable clamping device and is arranged on folder
Hold the fixed mechanism of actuator base.
A kind of direct current resistance of large transformer device for quick testing the most according to claim 5, its feature exists
In: clamping device includes the mobile clip (5) of tetragonal body shape fixing hoop (3) and bar shaped, fixing card
Hoop (3) upper surface arranges fixing hoop head (1), and mobile clip (5) upper surface arranges mobile hoop
(6) guide post (28), fixing hoop head (1) and mobile hoop (6) are set are formed with left surface
Oat tail groove structure, mobile clip (5) is telescopically connected to fixing hoop (3) by guide post (28)
In right flank pilot hole (29), in pilot hole (29), it is provided with compression spring (4), compression spring (4)
Two ends bear against and the baffle plate in pilot hole (29) aperture upper in guide post (28) end Step Shaft (2)
(30) on.
A kind of direct current resistance of large transformer device for quick testing the most according to claim 3, its feature exists
Include that two chutes (9) of channel-section steel shape and two pairs of L-types connect sheet (7,8) in: fixed mechanism, two
It is fixedly connected on symmetrically on fixing hoop (3) before and after chute (9), the groove face opposite of two chutes (9)
Installing, every pair connects sheet (7,8) minor face and is entrenched in chute, and uses holding screw (31) to fix,
Every pair connects sheet (7,8) long limit and is fixedly connected on electric magnet one (12) and electric magnet two (13).
A kind of direct current resistance of large transformer device for quick testing the most according to claim 3, its feature exists
In: also include that video monitor (32), video monitor (32) are connected to photographic head (33) by cable,
Photographic head (33) is arranged on liter downshift button panel (24) place, just in liter downshift button panel (24)
Gear display lamp (39).
A kind of direct current resistance of large transformer device for quick testing the most according to claim 8, its feature exists
In: the upper connection of photographic head (33) has clip (34), and clip (34) is by detachable movable installation side
Formula is fixed in liter downshift button panel (24), and photographic head (33) is connected to by direction flexible (35)
Clip (34).
10. according to the arbitrary described a kind of direct current resistance of large transformer device for quick testing of claim 1-9
Method of testing, it is characterised in that: the method comprises the following steps:
(1) high-pressure side D.C. resistance test: by high-pressure side test module by ammeter voltage corresponding for tester
Table is connected to high voltage side of transformer, and at A, B, C end of transformator A, B, C three-phase star winding
Distinguish every mutually tested winding of series current sample resistance RN, current sampling resistor RN and tested winding
Resistance RX composition series connection bleeder circuit, the current voltmeter every phase RN both end voltage of test and electric current,
Record every phase resistance: computing formula is as follows；
(2) low-pressure side D.C. resistance test: by low-pressure side test module by ammeter voltage corresponding for tester
Table is connected to step down side, by controller automatically control multicircuit relay realize high-pressure side winding with
The break-make in the different paths of low-pressure side winding, and loop is connected to power supply, the every phase of low-pressure side can be recorded
Resistance, is calculated can result be shown on display screen by controller.
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| CN201610223339.7A CN105842541B (en) | 2016-04-12 | 2016-04-12 | A kind of direct current resistance of large transformer device for quick testing and test method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462788A (en) * | 2017-07-17 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of method of testing of 500kV auto-transformers D.C. resistance |
| CN108535549A (en) * | 2018-06-11 | 2018-09-14 | 保定市力兴电子设备有限公司 | A kind of hand-held three-phase transformer instrument for measuring DC resistance |
| CN111337750A (en) * | 2020-02-11 | 2020-06-26 | 深圳供电局有限公司 | Method and device for synchronously testing direct resistance of three-phase winding of cable outgoing type transformer |
| CN112748371A (en) * | 2020-12-18 | 2021-05-04 | 国网福建省电力有限公司检修分公司 | Universal test structure and logic control method for multiple test items of transformer test |
| CN113391131A (en) * | 2021-08-03 | 2021-09-14 | 山东双益电气有限责任公司 | Resistance testing device and method for dry-type transformer tapping winding |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2192040Y (en) * | 1994-04-26 | 1995-03-15 | 胡维祥 | Precise quick measuring ohmmeter for testing direct impedance of wide measuring range transformer |
| CN1124846A (en) * | 1994-10-26 | 1996-06-19 | 华北电力学院 | Dynamic measuring method and apparatus for D.C. resistance of power transformer |
| CN202093095U (en) * | 2011-06-09 | 2011-12-28 | 上海市电力公司 | Direct-current resistance tester for transformer |
| CN202351328U (en) * | 2011-11-03 | 2012-07-25 | 杭州高电科技有限公司 | Three-channel direct-current resistance tester |
| CN102759662A (en) * | 2012-07-09 | 2012-10-31 | 中国长江三峡集团公司 | Method for measuring DC (Direct Current) resistances of transformer windings |
| CN102866299A (en) * | 2011-07-08 | 2013-01-09 | 保定市金源科技有限公司 | Method for testing direct-current resistance of transformer |
| CN103884915A (en) * | 2014-02-27 | 2014-06-25 | 国家电网公司 | Device and method for automatically measuring direct-current resistance of windings of power transformers |
| CN203674127U (en) * | 2013-12-30 | 2014-06-25 | 广东电网公司中山供电局 | Switchgear breaker opening system |
| US20140191774A1 (en) * | 2011-05-17 | 2014-07-10 | Haefely Test Ag | Apparatus and a method for testing winding resistances of transformers |
| CN204705672U (en) * | 2015-04-23 | 2015-10-14 | 国家电网公司 | A kind of automatic gear shifting phase-change Transformer Winding direct current resistance proving installation |
| CN205506941U (en) * | 2016-04-12 | 2016-08-24 | 贵州电网有限责任公司都匀供电局 | Quick testing arrangement of large -scale transformer direct current resistance |
-
2016
- 2016-04-12 CN CN201610223339.7A patent/CN105842541B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2192040Y (en) * | 1994-04-26 | 1995-03-15 | 胡维祥 | Precise quick measuring ohmmeter for testing direct impedance of wide measuring range transformer |
| CN1124846A (en) * | 1994-10-26 | 1996-06-19 | 华北电力学院 | Dynamic measuring method and apparatus for D.C. resistance of power transformer |
| US20140191774A1 (en) * | 2011-05-17 | 2014-07-10 | Haefely Test Ag | Apparatus and a method for testing winding resistances of transformers |
| CN202093095U (en) * | 2011-06-09 | 2011-12-28 | 上海市电力公司 | Direct-current resistance tester for transformer |
| CN102866299A (en) * | 2011-07-08 | 2013-01-09 | 保定市金源科技有限公司 | Method for testing direct-current resistance of transformer |
| CN202351328U (en) * | 2011-11-03 | 2012-07-25 | 杭州高电科技有限公司 | Three-channel direct-current resistance tester |
| CN102759662A (en) * | 2012-07-09 | 2012-10-31 | 中国长江三峡集团公司 | Method for measuring DC (Direct Current) resistances of transformer windings |
| CN203674127U (en) * | 2013-12-30 | 2014-06-25 | 广东电网公司中山供电局 | Switchgear breaker opening system |
| CN103884915A (en) * | 2014-02-27 | 2014-06-25 | 国家电网公司 | Device and method for automatically measuring direct-current resistance of windings of power transformers |
| CN204705672U (en) * | 2015-04-23 | 2015-10-14 | 国家电网公司 | A kind of automatic gear shifting phase-change Transformer Winding direct current resistance proving installation |
| CN205506941U (en) * | 2016-04-12 | 2016-08-24 | 贵州电网有限责任公司都匀供电局 | Quick testing arrangement of large -scale transformer direct current resistance |
Non-Patent Citations (3)
| Title |
|---|
| 卞颖慧 等: "变压器直流电阻助磁法测量转换开关的设计", 《湖北工业大学学报》 * |
| 梁志瑞 等: "大型电力变压器低压侧绕组直流电阻测试新方法", 《电力自动化设备》 * |
| 袁燕岭 等: "助磁法测量变压器直流电阻的应用研究", 《电气技术》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462788A (en) * | 2017-07-17 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of method of testing of 500kV auto-transformers D.C. resistance |
| CN108535549A (en) * | 2018-06-11 | 2018-09-14 | 保定市力兴电子设备有限公司 | A kind of hand-held three-phase transformer instrument for measuring DC resistance |
| CN111337750A (en) * | 2020-02-11 | 2020-06-26 | 深圳供电局有限公司 | Method and device for synchronously testing direct resistance of three-phase winding of cable outgoing type transformer |
| CN111337750B (en) * | 2020-02-11 | 2021-12-21 | 深圳供电局有限公司 | Method and device for synchronously testing direct resistance of three-phase winding of cable outgoing type transformer |
| CN112748371A (en) * | 2020-12-18 | 2021-05-04 | 国网福建省电力有限公司检修分公司 | Universal test structure and logic control method for multiple test items of transformer test |
| CN112748371B (en) * | 2020-12-18 | 2024-03-12 | 国网福建省电力有限公司检修分公司 | General test structure for multiple test items of transformer test and logic control method |
| CN113391131A (en) * | 2021-08-03 | 2021-09-14 | 山东双益电气有限责任公司 | Resistance testing device and method for dry-type transformer tapping winding |
| CN113391131B (en) * | 2021-08-03 | 2022-07-15 | 山东双益电气有限责任公司 | Resistance testing device and method for dry-type transformer tapping winding |
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