CN201497802U - High-voltage three-phase combined mutual inductor testing device - Google Patents
High-voltage three-phase combined mutual inductor testing device Download PDFInfo
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- CN201497802U CN201497802U CN2009201039499U CN200920103949U CN201497802U CN 201497802 U CN201497802 U CN 201497802U CN 2009201039499 U CN2009201039499 U CN 2009201039499U CN 200920103949 U CN200920103949 U CN 200920103949U CN 201497802 U CN201497802 U CN 201497802U
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Abstract
The utility model discloses a high-voltage three-phase combined mutual inductor testing device, which solves the problem that an existing single-phase check method need repeatedly connect wires to test, thereby having low working efficiency and error brought by interference between phases, and simulates the error changes of actual industrial and mineral tests when a combined mutual inductor operates. The high-voltage three-phase combined mutual inductor testing device comprises a computer control and information management system (1), a zero and overload protection module (2) of a voltage line, a single-phase voltage mutual inductor tester (3), a three-phase voltage load box (4), an electric three-phase voltage regulator (5) for a voltage mutual inductor, a three-phase voltage mutual inductor conversion and control module (6), an integrated three-phase standard voltage mutual inductor with booster (7) and a voltage portion of a tested three-phase combined inductor (8), wherein a three-phase power supply is connected in the electric three-phase voltage regulator (5) for a voltage mutual inductor through the zero and overload protection module (2) through a voltage line, the electric three-phase voltage regulator (5) for a voltage mutual inductor is connected with the booster part of the integrated standard voltage mutual inductor with booster (7) through YN, yn wires. The high-voltage three-phase combined mutual inductor testing device can form a system by itself, and has fast field detection and high efficiency.
Description
Technical field
The present invention relates to a kind of electric energy metrical and detect the proving installation that three combined sensors (electrical energy metering tank) or threephase potential transformer are used, be particularly related to and a kind ofly adopt one to carry the stepup transformer standard potential transformer formula threephase potential transformer that is combined into one by three all insulations single-phase and carry three-phase (or two-phase) the current transformer detection system of current lifting device current transformer as the current standard device as threephase potential transformer detection system and three high pressure of voltage standard device, two overlap the testing device for high-voltage three-phase combination transformer that electric measuring system is independently formed, can at on-the-spot three-phase combination transformer simulate its actual industrial and mineral carry out error performance with and the detection that influences each other.
Background technology
The National Development and Reform Commission issues simultaneously as far back as on August 1st, 2004 and has implemented industry standard JB/T10432-2004 " three-phase combination transformer " and JB/T10433-2004 " threephase potential transformer ", and State Administration for Quality Supervision and Inspection and Quarantine and national standardization management committee revised again and implemented GB17201-2007 " combination transformer " national standard on July 1st, 2008.Separately the method for test is promptly separately but present most of testing agency is all by single-phase current or voltage transformer (VT): by each phase high-tension current inductor of the single-phase test of each phase, low-pressure state of mutually single-phase test threephase potential transformer, all do not consider the error that interphase interference is brought into, do not simulate running status under the actual industrial and mineral of combination transformer.The three-phase combination transformer of 10kV electric pressure (batch meter) was used by large-scale popularization in recent years, and this kind equipment is installed on the large user mostly and critical point metering usefulness is made in the private station change, its disturbing effect between phase and phase the accuracy of electric energy metrical, is directly connected to the just and fair of the economic benefit of power consumer and electric energy metrical trade settlement.Therefore be necessary to carry out effectively and accurately to detect its interphase interference to the amount of influence of error to check its accuracy.All less than the equipment that is suitable for, product testing is all tested calibrating respectively with single-phase standard to domestic each metrology and measurement calibration authority under single phase poaer supply, can not truly reflect the error and the respective performances of three-phase combination transformer, does not also meet request of national standard.
Summary of the invention
Testing device for high-voltage three-phase combination transformer provided by the invention will change existing single-phase method of calibration, make it meet the requirement of existing national sector standard and be easy to realize and check, both combination transformer (electrical energy metering tank) or threephase potential transformer, simulate it fully under actual working state, just under three-phase 10kV or 35kV high voltage, survey the error and the amount of influence thereof of current transformer and voltage transformer (VT), such measurement is truer, more accurate than common single-phase measurement three-phase combination transformer.It does not need in the existing single-phase process repeatedly problem such as wiring test, can save a large amount of manpower and materials, increases work efficiency.
The present invention solves above technical matters by the following technical programs:
1, a kind of technical scheme of testing device for high-voltage three-phase combination transformer, comprise threephase potential transformer check test circuit and the threephase current transformer check test circuit that can independently carry out test job, threephase potential transformer check test circuit and threephase current transformer check test circuit also can be carried out check test at combination transformer simultaneously.Two cover test macros independently use two-way three-phase symmetrical balance power supply, and each uses a single-phase mutual-inductor tester.Concrete invention is to constitute like this: threephase potential transformer check test circuit comprises computer control and information management system (1), the zero-bit of voltage circuit and overload protection module (2), single-phase potential transformer tester (3), three-phase voltage Burden box (4), voltage transformer (VT) is with electronic three-phase regulator (5), threephase potential transformer conversion and control module (6), the integral type three-phase carries stepup transformer standard potential transformer (7), tested three-phase combination transformer (8) voltage segment; Its annexation is: zero-bit and the overload protection module (2) of three-phase supply by voltage circuit inserts voltage transformer (VT) with electronic three-phase regulator (5); voltage transformer (VT) carries the middle stepup transformer of stepup transformer standard potential transformer (7) with electronic three-phase regulator (5) and integral type three-phase and partly adopts YN, the yn wiring.
At connect the tested three-phase combination transformer (8) that voltage transformer (VT) and three-phase (or two-phase) current transformer are formed by V, the integral type three-phase carries a polar end A of stepup transformer standard potential transformer (7)
0And C
0Respectively with the A of tested three-phase combination transformer (8) voltage segment
xAnd C
xEnd connects, and the integral type three-phase carries a non-polar end X of stepup transformer standard potential transformer (7)
AAnd X
CBehind the short circuit again with the B of tested three-phase combination transformer (8) voltage segment
xEnd connects, and the integral type three-phase carries the secondary polar end a of stepup transformer standard potential transformer (7)
0And c
0And secondary non-polar end x
aAnd x
c(corresponding connecting terminal row's 0 terminal) corresponding respectively threephase potential transformer conversion and control module (6) terminal row of inserting behind the short circuit.The secondary polar end a of tested three-phase combination transformer (8) voltage segment
x, b
x, c
xExcept that corresponding the access threephase potential transformer conversion and control module (6) terminal row respectively also will be distinguished corresponding access three-phase voltage Burden box (4).Corresponding respectively threephase potential transformer conversion and control module (6) terminal row, the terminal K of inserting of single-phase potential transformer tester (3) terminal a, x, D
uWith the x short circuit, single-phase potential transformer tester (3) is also wanted other ground connection.The threephase potential transformer conversion connects with control module (6) and single-phase potential transformer tester (3) connection and computer control and information management system (1).
At connect the tested three-phase combination transformer (8) that voltage transformer (VT) and three-phase (or two-phase) current transformer are formed by Y, the integral type three-phase carries a polar end A of stepup transformer standard potential transformer (7)
0, B
0, C
0Respectively successively with the A of tested three-phase combination transformer (8) voltage segment
x, B
x, C
xEnd connects, and the integral type three-phase carries a non-polar end X of stepup transformer standard potential transformer (7)
A, X
B, X
CShort circuit, integral type three-phase carry the secondary non-polar end x of stepup transformer standard potential transformer (7)
a, x
b, x
cShort circuit, secondary polar end a
0, b
0, c
0Corresponding respectively threephase potential transformer conversion and control module (6) terminal row of inserting, other are the same.
The threephase potential transformer conversion is seen accompanying drawing 5 with inner the connection with switching of control module (6): capacitor C 2, pushbutton switch S1, resistance R 1, R2 form the low level reset circuit jointly and link to each other with the RST pin of AT89S52 single-chip microcomputer U1.Crystal oscillator Y1, capacitor C 1, C4 form oscillatory circuit jointly and link to each other with XTAL1, the XTAL2 pin of AT89S52 single-chip microcomputer U1.Capacitor C 3, C5, C6, C7, C8 and MAX232A serial ports conversion chip U2 form level shifting circuit, the level conversion of the P3.0 of AT89S52 single-chip microcomputer U1 and P3.1 pin are outputed to 2,3 mouthfuls of 9 needle serial port JX1.Computing machine is by 9 needle serial port JX1 control total system.Photoelectrical coupler U3 links to each other with resistance R 3, photoelectrical coupler U4 links to each other with resistance R 4, photoelectrical coupler U5 links to each other with resistance R 5, photoelectrical coupler U6 links to each other with resistance R 6, photoelectrical coupler U7 links to each other with resistance R 7, photoelectrical coupler U8 links to each other with resistance R 8, and photoelectrical coupler U9 links to each other with resistance R 9, and P2.6, P2.5, P2.4, P2.3, P2.2, P2.1, the P2.0 with AT89S52 single-chip microcomputer U1 is connected to form seven channel control circuits respectively.Relay K 1, K2, K3 form self-locking and interlock circuit control terminal a
x, b
x, c
x, a
0, b
0/ o, c
0, a, x, D break-make, and show on off operating mode by the light on and off of light emitting diode LDE1, LDE2, LDE3.Relay K A connects with button 0SB1 and controls the break-make of 5V control circuit general supply jointly.Relay K A4, KA5 interlocking connect the break-make of control contactor KM1, KM2.Relay K A6 and terminal b
0, o, b
0/ o is used for gating terminal b
0, o.Combination switch 0SB7,0SB8, position switch SQ3, SQ4 form control circuit control motor movement with contactor KM2, KM3.Contactor KM1, button 0SB6, position switch SQ1, SQ2 form control motor on-off circuit jointly.
Threephase current transformer check test circuit comprises shared computer control and information management system (1), single-phase current mutual-inductor tester (16), the zero-bit of current circuit and overload protection module (15), single-phase current Burden box (14), current transformer is with electronic three-phase regulator (13), threephase current transformer conversion and control module (12), A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure carries current lifting device standard current transformer (10), C phase high pressure carries current lifting device standard current transformer (9) and tested three-phase combination transformer (8) current segment; Its annexation is: zero-bit and the overload protection module (15) of three-phase supply by current circuit inserts current transformer with electronic three-phase regulator (13); current transformer with each phase line of electronic three-phase regulator (13) output respectively with A mutually high pressure carry current lifting device standard current transformer (11); B phase high pressure carries current lifting device standard current transformer (10) (two phase times then do not have the B phase); the end that C phase high pressure carries current lifting device part in the current lifting device standard current transformer (9) connects; current transformer with the zero line of electronic three-phase regulator (13) simultaneously with A mutually B phase C mutually each phase high pressure other end of carrying current lifting device part in the current lifting device standard current transformer connect, current transformer inserts threephase current transformer conversion and control module (12) terminal row with the motor line of electronic three-phase regulator (13).A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure and carries current lifting device standard current transformer (10) (two phase times then do not have the B phase), C phase high pressure and carry in the current lifting device standard current transformer (9) once polar end A
0P1, B
0P1 (two phase times need not), C
0P1 is connected with polar end AP1, BP1 (two phase times do not have), the CP1 of tested three-phase combination transformer current segment respectively, and A phase B phase C mutually each phase high pressure carries in the current lifting device standard current transformer (two phase times then do not have the B phase) once non-polar end A
0P2, B
0P2 (two phase times need not), C
0P2 is connected with non-polar end AP2, BP2 (two phase times do not have), the CP2 of tested three-phase combination transformer current segment respectively.A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure and carries the polar end a that current lifting device standard current transformer (10) (two phase times then do not have the B phase), C phase high pressure carry secondary in the current lifting device standard current transformer (9)
0S1, b
0S1 (two phase times need not), c
0S1 and non-polar end a
0S2, b
0S2 (two phase times need not), c
0Corresponding respectively successively threephase current transformer conversion and control module (12) terminal row of inserting of S2.Also corresponding respectively successively threephase current transformer conversion and control module (12) terminal row of inserting of polar end aS1, the bS1 of tested three-phase combination transformer current segment secondary (two phase times do not have), cS1 and non-polar end aS2, bS2 (two phase times do not have), cS2.The T of single-phase current mutual-inductor tester (16)
xTerminal inserts after the single-phase current Burden box (14) and T again
0Corresponding respectively threephase current transformer conversion and control module (12) terminal row of inserting of terminal K terminal, single-phase current mutual-inductor tester (16) is also wanted other ground connection.The threephase current transformer conversion connects with control module (12) and single-phase current mutual-inductor tester (16) connection and computer control and information management system (1).The threephase current transformer conversion is seen accompanying drawing 6 with inner the connection with switching of control module (12): capacitor C 11, pushbutton switch S2, resistance R 13, R14 form the low level reset circuit jointly and link to each other with the RST pin of AT89S52 single-chip microcomputer U11.Crystal oscillator Y2, capacitor C 9, C13 form oscillatory circuit jointly and link to each other with XTAL1, the XTAL2 pin of AT89S52 single-chip microcomputer U11.Capacitor C 10, C12, C14, C15, C16 and MAX232A serial ports conversion chip U10 form level shifting circuit, the level conversion of the P3.0 of AT89S52 single-chip microcomputer U11 and P3.1 are outputed to 2,3 mouthfuls of 9 needle serial port JX2.Computing machine is by 9 needle serial port JX2 control total system.Photoelectrical coupler U12 links to each other with resistance R 15, photoelectrical coupler U13 links to each other with resistance R 16, photoelectrical coupler U14 links to each other with resistance R 17, photoelectrical coupler U15 links to each other with resistance R 18, photoelectrical coupler U16 links to each other with resistance R 19, photoelectrical coupler U17 links to each other with resistance R 20, and P2.5, P2.4, P2.3, P2.2, P2.1, the P2.0 port with AT89S52 single-chip microcomputer U11 is connected to form six channel control circuits respectively.Relay K 10, K11, K12 are formed the break-make of self-locking and interlock circuit control contactor KM4, KM5, KM6, relay K A7, KA8, KA9, and by the light on and off demonstration on off operating mode of light emitting diode LDE4, LDE5, LDE6.Relay K A13 connects with button SB1 and controls the break-make of 5V control circuit general supply jointly.Relay K A14, KA15 interlocking connect the break-make of control contactor KM8, KM9.Combination switch SB7, SB8, position switch SQ7, SQ8 form control circuit control motor movement with contactor KM8, KM9.Contactor KM7, button SB6, position switch SQ5, SQ6 form control motor on-off circuit jointly.Relay K A7, KA8, KA9 interlocking connect the break-make of control contactor KM4, KM5, KM6.Contactor KM4, KM5, KM6 control terminal aS1, aS2, bS1, bS2, cS1, cS2, a
0S1, a
0S2, b
0S1, b
0S2, c
0S1, c
0S2, T
x, T
0, K
iBreak-make.
2, according to 1 described a kind of testing device for high-voltage three-phase combination transformer, it is characterized in that: when this testing device for high-voltage three-phase combination transformer is pressed JB/T10432-2004 " three-phase combination transformer " error determine method test, can apply the three-phase current and the three-phase voltage of regulation simultaneously, remove to test and connect the three-phase combination transformer that voltage transformer (VT) and three-phase (or two-phase) current transformer form by V and see accompanying drawing 1 and accompanying drawing 2, the three-phase combination transformer of can also verification being made up of Y connection voltage transformer (VT) and three-phase (or two-phase) current transformer is seen accompanying drawing 3 and accompanying drawing 4.Also can dispose corresponding milivoltmeter or oscillograph measuring voltage mutual inductor secondary induction voltage respectively, can calculate current transformer to the error effect of voltage transformer (VT) and the resistance R of recommending, just can calculate the error effect of threephase potential transformer current transformer in every phase current mutual inductor access national standard of three-phase combination transformer (8).
3, according to 1 described a kind of testing device for high-voltage three-phase combination transformer, it is characterized in that: the threephase potential transformer check test circuit in this testing device for high-voltage three-phase combination transformer removes the voltage transformer (VT) that V connects or Y connects in the verification combination transformer that can boost simultaneously, and verification independent threephase potential transformer simultaneously can also boost.
But the present invention has the integrated self-organizing system in order of voltage current transformer two cover test loops, the scene detection is quick, efficient is high, test specification is wide, it is flexible, simple to operate to move, energy consumption is low and it is easy to safeguard.
Description of drawings:
Fig. 1. be to the present invention is directed to the three-phase combination transformer measurement circuit figure that forms by V connection voltage transformer (VT) and threephase current transformer
Fig. 2. be to the present invention is directed to the three-phase combination transformer measurement circuit figure that forms by V connection voltage transformer (VT) and biphase current mutual inductor
Fig. 3. be to the present invention is directed to the three-phase combination transformer measurement circuit figure that forms by Y connection voltage transformer (VT) and threephase current transformer
Fig. 4. be to the present invention is directed to the three-phase combination transformer measurement circuit figure that forms by Y connection voltage transformer (VT) and biphase current mutual inductor
Fig. 5. be threephase potential transformer conversion and control module (6) wiring transfer principle figure among the present invention
Fig. 6. be conversion of three-phase among the present invention (or two-phase) current transformer and control module (12) wiring transfer principle figure
Fig. 7. be the programmed control block diagram of threephase potential transformer test among the present invention
Fig. 8. be the programmed control block diagram of three-phase among the present invention (or two-phase) current transformer test
Embodiment
Embodiment one:
The technical scheme of a kind of testing device for high-voltage three-phase combination transformer in the present embodiment is seen accompanying drawing 1, comprise the 10kV threephase potential transformer check test circuit that can independently carry out test job and the 5A～600A/5A threephase current transformer check test circuit that can independently carry out test job, threephase potential transformer check test circuit and threephase current transformer check test circuit also can be carried out check test at the 10kV combination transformer simultaneously.Two cover autonomous systems respectively use a cover three-phase to advance ups power mark organizational security that three-phase goes out 10kVA to have demonstrate,proved power supply three-phase symmetrical balance noiseless, each uses a general intelligent mutual-inductor tester to replace single-phase mutual-inductor tester.Concrete invention is to constitute like this: threephase potential transformer check test circuit comprises that computer control and information management system (1) comprise computer and software, the zero-bit of voltage circuit and overload protection module (2), single-phase potential transformer tester (3), three-phase voltage Burden box (4) can directly be carried out V according to the load wiring difference of the tested mutual inductor of reality, Y, the Δ mode is switched, the voltage transformer (VT) electronic three-phase regulator of 6kVA (5), threephase potential transformer conversion and control module (6), 0.02 level 10kV/100V all insulation cast integral type three-phase carries stepup transformer standard potential transformer (7), as test specimen voltage 10kV/100V below 0.2 grade, the following 5A of electric current 0.2S level～600A/5A three-phase combination transformer (8); Its annexation is: zero-bit and the overload protection module (2) of three-phase supply by voltage circuit inserts voltage transformer (VT) with electronic three-phase regulator (5); voltage transformer (VT) carries the middle stepup transformer of stepup transformer standard potential transformer (7) with electronic three-phase regulator (5) and integral type three-phase and partly adopts YN, the yn wiring.
At connect the tested three-phase combination transformer (8) that voltage transformer (VT) and three-phase (or two-phase) current transformer are formed by V, the integral type three-phase carries a polar end A of stepup transformer standard potential transformer (7)
0And C
0Respectively with the A of tested three-phase combination transformer (8) voltage segment
xAnd C
xEnd connects, and the integral type three-phase carries a non-polar end X of stepup transformer standard potential transformer (7)
AAnd X
CBehind the short circuit again with the B of tested three-phase combination transformer (8) voltage segment
xEnd connects, and the integral type three-phase carries the secondary polar end a of stepup transformer standard potential transformer (7)
0And c
0And secondary non-polar end x
aAnd x
c(corresponding connecting terminal row's 0 terminal) corresponding respectively threephase potential transformer conversion and control module (6) terminal row of inserting behind the short circuit.The secondary polar end a of tested three-phase combination transformer (8) voltage segment
x, b
x, c
xExcept that corresponding the access threephase potential transformer conversion and control module (6) terminal row respectively also will be distinguished corresponding access three-phase voltage Burden box (4).Corresponding respectively threephase potential transformer conversion and control module (6) terminal row, the terminal K of inserting of single-phase potential transformer tester (3) terminal a, x, D
uWith the x short circuit, single-phase potential transformer tester (3) is also wanted other ground connection.The threephase potential transformer conversion connects with control module (6) and single-phase potential transformer tester (3) connection and computer control and information management system (1).
At connect the tested three-phase combination transformer (8) that voltage transformer (VT) and three-phase (or two-phase) current transformer are formed by Y, the integral type three-phase carries a polar end A of stepup transformer standard potential transformer (7)
0, B
0, C
0Respectively successively with the A of tested three-phase combination transformer (8) voltage segment
x, B
x, C
xEnd connects, and the integral type three-phase carries a non-polar end X of stepup transformer standard potential transformer (7)
A, X
B, X
CShort circuit, integral type three-phase carry the secondary non-polar end x of stepup transformer standard potential transformer (7)
a, x
b, x
cShort circuit, secondary polar end a
0, b
0, c
0Corresponding respectively threephase potential transformer conversion and control module (6) terminal row of inserting, other are the same.
The threephase potential transformer conversion is seen accompanying drawing 5 with inner the connection with switching of control module (6): capacitor C 2, pushbutton switch S1, resistance R 1, R2 form the low level reset circuit jointly and link to each other with the RST pin of AT89S52 single-chip microcomputer U1.Crystal oscillator Y1, capacitor C 1, C4 form oscillatory circuit jointly and link to each other with XTAL1, the XTAL2 pin of AT89S52 single-chip microcomputer U1.Capacitor C 3, C5, C6, C7, C8 and MAX232A serial ports conversion chip U2 form level shifting circuit, the level conversion of the P3.0 of AT89S52 single-chip microcomputer U1 and P3.1 pin are outputed to 2,3 mouthfuls of 9 needle serial port JX1.Computing machine is by 9 needle serial port JX1 control total system.Photoelectrical coupler U3 links to each other with resistance R 3, photoelectrical coupler U4 links to each other with resistance R 4, photoelectrical coupler U5 links to each other with resistance R 5, photoelectrical coupler U6 links to each other with resistance R 6, photoelectrical coupler U7 links to each other with resistance R 7, photoelectrical coupler U8 links to each other with resistance R 8, and photoelectrical coupler U9 links to each other with resistance R 9, and P2.6, P2.5, P2.4, P2.3, P2.2, P2.1, the P2.0 with AT89S52 single-chip microcomputer U1 is connected to form seven channel control circuits respectively.Relay K 1, K2, K3 form self-locking and interlock circuit control terminal a
x, b
x, c
x, a
0, b
0/ o, c
0, a, x, D break-make, and show on off operating mode by the light on and off of light emitting diode LDE1, LDE2, LDE3.Relay K A connects with button 0SB1 and controls the break-make of 5V control circuit general supply jointly.Relay K A4, KA5 interlocking connect the break-make of control contactor KM1, KM2.Relay K A6 and terminal b
0, o, b
0/ o is used for gating terminal b
0, o.Combination switch 0SB7,0SB8, position switch SQ3, SQ4 form control circuit control motor movement with contactor KM2, KM3.Contactor KM1, button 0SB6, position switch SQ1, SQ2 form control motor on-off circuit jointly.
Its principle of work is: zero-bit and the overload protection module (2) of 3 * 380V three-phase ac power supply by voltage circuit inserts voltage transformer (VT) with electronic three-phase regulator (5) input end; computer control and information management system (1) are controlled voltage transformer (VT) by voltage transformer (VT) with motor interface circuit control module (2) and are started with electronic three-phase regulator (5); the stepup transformer of carrying stepup transformer standard potential transformer (7) for the integral type three-phase is partly powered and is risen the three-phase high voltage; give simultaneously in standard potential transformer (8) that the integral type three-phase carries stepup transformer and the tested three-phase combination transformer (8) the voltage transformer (VT) part or independently the primary circuit of threephase potential transformer high voltage is provided; the integral type three-phase carry in the standard potential transformer part of stepup transformer standard potential transformer (7) and the tested three-phase combination transformer (8) the voltage transformer (VT) part or independently the secondary of threephase potential transformer induce secondary voltage and in computer control and information management system (1) control, pass to single-phase potential transformer tester (3) by threephase potential transformer conversion and control module (6); form the comparison loop of the test differential pressure of secondary closure; three-phase voltage Burden box (4) provides corresponding simulation three-phase voltage load any stack combinations between 1.25VA～158.75VA according to the capacity of tested threephase potential transformer; single-phase potential transformer tester (3) carries out passing to computer control and information management system (1) again after data operation is handled; for safety; prevent that chance failure from taking place; computer control and information management system (1) by the safe voltage following time below 1% rated voltage by receiving the error information intelligent decision no-load voltage ratio mistake after single-phase potential transformer tester (3) is gathered calculation process; faults such as the anti-and second short circuit of polarity; the discovery fault is returned zero-bit immediately and is disconnected major loop; computer control and information management system (1) should promptly be controlled threephase potential transformer conversion and control module (6) by national Specification and change the A quadratic phase of B phase C phase (Y connection) or AB phase CB phase (V connection) mutually successively in proper order after the error information that receives under 80% rated voltage after single-phase potential transformer tester (3) is gathered calculation process after confirming there is not fault; when controlling voltage transformer (VT) and boost to 100% rated voltage with motor interface circuit control module (2) by voltage transformer (VT) again with electronic three-phase regulator (5) successively the quadratic phase of backward conversion A phase B phase C phase (Y connections) or AB phase CB phase (V connection) and receive single-phase potential transformer tester (3) collection calculation process after error information; error information after order is changed the quadratic phase of A phase B phase C phase (Y connection) or AB phase CB phase (V connection) and received single-phase potential transformer tester (3) collection calculation process successively when in like manner boosting to 120% rated voltage; computer control and information management system (1) are controlled voltage transformer (VT) by voltage transformer (VT) with motor interface circuit control module (2) and are returned to zero-bit and disconnect major loop with electronic three-phase regulator (5) then; computer control and information management system (1) are handled the error information information of gathering and are judged whether qualifiedly, have so far finished the test of threephase potential transformer.
Threephase current transformer check test circuit comprises that computer control and information management system (1) comprise computer and software; single-phase current mutual-inductor tester (16); the zero-bit of voltage circuit and overload protection module (15); single-phase current Burden box (14); current transformer is formed electronic three-phase regulator (14) with 6kVA coarse adjustment and 1.5kVA fine tuning; threephase current transformer conversion and control module (12); A phase high pressure carries (11) 0.02 grades of 5A～600A/5A of current lifting device standard current transformer; B phase high pressure carries (10) 0.02 grades of 5A～600A/5A of current lifting device standard current transformer; C phase high pressure carries (9) 0.02 grades of 5A～600A/5A of current lifting device standard current transformer and as test specimen voltage 10kV/100V below 0.2 grade; the combination transformer (8) of the following 5A～600A/5A of electric current 0.2S level.Its annexation is: zero-bit and the overload protection module (15) of three-phase supply by current circuit inserts current transformer with electronic three-phase regulator (13); current transformer with each phase line of electronic three-phase regulator (13) output respectively with A mutually high pressure carry current lifting device standard current transformer (11); B phase high pressure carries current lifting device standard current transformer (10) (two phase times then do not have the B phase); the end that C phase high pressure carries current lifting device part in the current lifting device standard current transformer (9) connects; current transformer with the zero line of electronic three-phase regulator (13) simultaneously with A mutually B phase C mutually each phase high pressure other end of carrying current lifting device part in the current lifting device standard current transformer connect, current transformer inserts threephase current transformer conversion and control module (12) terminal row with the motor line of electronic three-phase regulator (13).A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure and carries current lifting device standard current transformer (10) (two phase times then do not have the B phase), C phase high pressure and carry in the current lifting device standard current transformer (9) once polar end A
0P1, B
0P1 (two phase times need not), C
0P1 is connected with polar end AP1, BP1 (two phase times do not have), the CP1 of tested three-phase combination transformer current segment respectively, and A phase B phase C mutually each phase high pressure carries in the current lifting device standard current transformer (two phase times then do not have the B phase) once non-polar end A
0P2, B
0P2 (two phase times need not), C
0P2 is connected with non-polar end AP2, BP2 (two phase times do not have), the CP2 of tested three-phase combination transformer current segment respectively.A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure and carries the polar end a that current lifting device standard current transformer (10) (two phase times then do not have the B phase), C phase high pressure carry secondary in the current lifting device standard current transformer (9)
0S1, b
0S1 (two phase times need not), c
0S1 and non-polar end a
0S2, b
0S2 (two phase times need not), c
0Corresponding respectively successively threephase current transformer conversion and control module (12) terminal row of inserting of S2.Also corresponding respectively successively threephase current transformer conversion and control module (12) terminal row of inserting of polar end aS1, the bS1 of tested three-phase combination transformer current segment secondary (two phase times do not have), cS1 and non-polar end aS2, bS2 (two phase times do not have), cS2.The T of single-phase current mutual-inductor tester (16)
xTerminal inserts after the single-phase current Burden box (14) and T again
0Corresponding respectively threephase current transformer conversion and control module (12) terminal row of inserting of terminal K terminal, single-phase current mutual-inductor tester (16) is also wanted other ground connection.The threephase current transformer conversion connects with control module (12) and single-phase current mutual-inductor tester (16) connection and computer control and information management system (1).The threephase current transformer conversion is seen accompanying drawing 6 with inner the connection with switching of control module (12): capacitor C 11, pushbutton switch S2, resistance R 13, R14 form the low level reset circuit jointly and link to each other with the RST pin of AT89S52 single-chip microcomputer U11.Crystal oscillator Y2, capacitor C 9, C13 form oscillatory circuit jointly and link to each other with XTAL1, the XTAL2 pin of AT89S52 single-chip microcomputer U11.Capacitor C 10, C12, C14, C15, C16 and MAX232A serial ports conversion chip U10 form level shifting circuit, the level conversion of the P3.0 of AT89S52 single-chip microcomputer U11 and P3.1 are outputed to 2,3 mouthfuls of 9 needle serial port JX2.Computing machine is by 9 needle serial port JX2 control total system.Photoelectrical coupler U12 links to each other with resistance R 15, photoelectrical coupler U13 links to each other with resistance R 16, photoelectrical coupler U14 links to each other with resistance R 17, photoelectrical coupler U15 links to each other with resistance R 18, photoelectrical coupler U16 links to each other with resistance R 19, photoelectrical coupler U17 links to each other with resistance R 20, and P2.5, P2.4, P2.3, P2.2, P2.1, the P2.0 port with AT89S52 single-chip microcomputer U11 is connected to form six channel control circuits respectively.Relay K 10, K11, K12 are formed the break-make of self-locking and interlock circuit control contactor KM4, KM5, KM6, relay K A7, KA8, KA9, and by the light on and off demonstration on off operating mode of light emitting diode LDE4, LDE5, LDE6.Relay K A13 connects with button SB1 and controls the break-make of 5V control circuit general supply jointly.Relay K A14, KA15 interlocking connect the break-make of control contactor KM8, KM9.Combination switch SB7, SB8, position switch SQ7, SQ8 form control circuit control motor movement with contactor KM8, KM9.Contactor KM7, button SB6, position switch SQ5, SQ6 form control motor on-off circuit jointly.Relay K A7, KA8, KA9 interlocking connect the break-make of control contactor KM4, KM5, KM6.Contactor KM4, KM5, KM6 control terminal aS1, aS2, bS1, bS2, cS1, cS2, a
0S1, a
0S2, b
0S1, b
0S2, c
0S1, c
0S2, T
x, T
0, K
iBreak-make.
Threephase current transformer check test circuit can adjust that A phase high pressure carries the no-load voltage ratio of current lifting device standard current transformer (11) and or B phase high pressure carries the no-load voltage ratio of current lifting device standard current transformer (10) and no-load voltage ratio that C phase high pressure carries current lifting device standard current transformer (9) makes the standard of correspondence consistent with tested no-load voltage ratio according to the no-load voltage ratio of three-phase (or two-phase) current transformer in the tested combination transformer (8) respectively.Its principle of work is: zero-bit and the overload protection module (16) of 3 * 380V three-phase ac power supply by current circuit inserts current transformer with electronic three-phase regulator (13); computer control and information management system (1) start with electronic three-phase regulator (13) by controlling current transformer; give simultaneously A phase high pressure carry current lifting device standard current transformer (11) and or B mutually high pressure carry current lifting device that current lifting device standard current transformer (10) and C phase high pressure carry current lifting device standard current transformer (9) the big electric current of rise of partly powering; give simultaneously A phase high pressure carry current lifting device standard current transformer (11) and or B mutually high pressure carry current lifting device standard current transformer (10) and C phase high pressure carries current lifting device standard current transformer (9) and the middle current transformer of tested three-phase combination transformer (8) primary circuit partly provides once big electric current; give simultaneously A phase high pressure carry current lifting device standard current transformer (11) and or B mutually high pressure carry secondary that current lifting device standard current transformer (10) and C phase high pressure carry current transformer part in the standard current transformer part of current lifting device standard current transformer (9) and the tested three-phase combination transformer (8) and induce secondary current and in computer control and information management system (1) are controlled, pass to single-phase current mutual-inductor tester (16) by threephase current transformer conversion and control module (12); form the comparison loop of the test difference stream of secondary closure; current capacity case (15) provides corresponding analog current load according to the capacity of tested threephase current transformer; single-phase potential transformer tester (17) carries out passing to computer control and information management system (1) again after data operation is handled; for safety; prevent that chance failure from taking place; computer control and information management system (1) by the safety current following time below 0.5% rated current by receiving the error information intelligent decision no-load voltage ratio mistake after single-phase potential transformer tester (3) is gathered calculation process; faults such as the anti-and second open circuit of polarity; the discovery fault is returned zero-bit immediately and is disconnected major loop; computer control and information management system (1) should promptly be controlled threephase current transformer conversion and control module (12) by national Specification and change the A quadratic phase of B phase C phase (Y connection) or A phase C phase (V connection) mutually successively in proper order after the error information that receives under 1% (at S level current transformer) or 5% rated current after single-phase potential transformer tester (17) is gathered calculation process after confirming there is not fault; error information after backward is changed the quadratic phase of A phase B phase C phase (Y connection) or A phase C phase (V connection) and received single-phase potential transformer tester (17) collection calculation process successively when controlling current transformer with electronic three-phase regulator (13) pressure regulation up-flow to 20% rated current again; in like manner boost to 100% alternately change successively during with 120% rated current A mutually B phase C phase (Y connection) or A phase C phase (V connection) quadratic phase and receive error information after single-phase potential transformer tester (17) is gathered calculation process; computer control and information management system (1) return to zero-bit by controlling current transformer with electronic three-phase regulator (13) then; computer control and information management system (1) are handled the error information information of gathering and are judged whether qualifiedly, so far finish the test of three-phase (or two-phase) current transformer.
Embodiment two:
The technical scheme of a kind of testing device for high-voltage three-phase combination transformer in the present embodiment in the present embodiment is seen accompanying drawing 1, wherein can independently carry out the 10kV threephase potential transformer check test circuit of test job among the embodiment one and can also test independent threephase potential transformer as stated above.
Embodiment three:
A kind of testing device for high-voltage three-phase combination transformer in the present embodiment, it is characterized in that: when this testing device for high-voltage three-phase combination transformer carries out error determine by GB17201-2007 " combination transformer " type approval test, remove the three-phase current and the three-phase voltage that can apply regulation simultaneously, directly verification is connect by V or Y connects the three-phase combination transformer that voltage transformer (VT) and three-phase (or two-phase) current transformer are formed, also can dispose corresponding milivoltmeter or oscillograph measuring voltage mutual inductor secondary induction voltage respectively in addition, can calculate current transformer to the error effect of voltage transformer (VT) and resistance R=4 Ω that recommend in every phase current mutual inductor access national standard of three-phase combination transformer (8), just can calculate the error effect of threephase potential transformer current transformer.Except that this error influence each other the test, can also do temperature rise test with thermocouple measurement.
Claims (4)
1. a testing device for high-voltage three-phase combination transformer comprises that the zero-bit of computer control and information management system (1), voltage circuit and overload protection module (2), single-phase potential transformer tester (3), three-phase voltage Burden box (4), voltage transformer (VT) carry stepup transformer standard potential transformer (7), tested three-phase combination transformer (8) voltage segment with electronic three-phase regulator (5), threephase potential transformer conversion with control module (6), integral type three-phase; Zero-bit and the overload protection module (2) of three-phase supply by voltage circuit inserts voltage transformer (VT) with electronic three-phase regulator (5), voltage transformer (VT) carries the middle stepup transformer of stepup transformer standard potential transformer (7) with electronic three-phase regulator (5) and integral type three-phase and partly adopts YN, the yn wiring; It is characterized in that described threephase potential transformer conversion with control module (6) structure is: capacitor C 2, pushbutton switch S1, resistance R 1, R2 form the low level reset circuit jointly and link to each other with the RST pin of AT89S52 single-chip microcomputer U1; Crystal oscillator Y1, capacitor C 1, C4 form oscillatory circuit jointly and link to each other with XTAL1, the XTAL2 pin of AT89S52 single-chip microcomputer U1; Capacitor C 3, C5, C6, C7, C8 and MAX232A serial ports conversion chip U2 form level shifting circuit, the level conversion of the P3.0 of AT89S52 single-chip microcomputer U1 and P3.1 pin are outputed to 2,3 mouthfuls of 9 needle serial port JX1; Computing machine is by 9 needle serial port JX1 control total system; Photoelectrical coupler U3 links to each other with resistance R 3, photoelectrical coupler U4 links to each other with resistance R 4, photoelectrical coupler U5 links to each other with resistance R 5, photoelectrical coupler U6 links to each other with resistance R 6, photoelectrical coupler U7 links to each other with resistance R 7, photoelectrical coupler U8 links to each other with resistance R 8, and photoelectrical coupler U9 links to each other with resistance R 9, and P2.6, P2.5, P2.4, P2.3, P2.2, P2.1, the P2.0 with AT89S52 single-chip microcomputer U1 is connected to form seven channel control circuits respectively; Relay K 1, K2, K3 form self-locking and interlock circuit control terminal a
x, b
x, c
x, a
0, b
0/ o, c
0, a, x, D break-make, and show on off operating mode by the light on and off of light emitting diode LDE1, LDE2, LDE3; Relay K A connects with button OSB1 and controls the break-make of 5V control circuit general supply jointly; Relay K A4, KA5 interlocking connect the break-make of control contactor KM1, KM2; Relay K A6 and terminal b
0, o, b
0/ o is used for gating terminal b
0, o; Combination switch OSB7, OSB8, position switch SQ3, SQ4 form control circuit control motor movement with contactor KM2, KM3; Contactor KM1, button OSB6, position switch SQ1, SQ2 form control motor on-off circuit jointly.
2. testing device for high-voltage three-phase combination transformer according to claim 1, it is characterized in that: described tested three-phase combination transformer (8) connects voltage transformer (VT) and three-phase or biphase current mutual inductor by V and forms, and the integral type three-phase carries a polar end A of stepup transformer standard potential transformer (7)
0And C
0Respectively with the A of tested three-phase combination transformer (8) voltage segment
xAnd C
xEnd connects, and the integral type three-phase carries a non-polar end X of stepup transformer standard potential transformer (7)
AAnd X
CBehind the short circuit again with the B of tested three-phase combination transformer (8) voltage segment
xEnd connects, and the integral type three-phase carries the secondary polar end a of stepup transformer standard potential transformer (7)
0And c
0And secondary non-polar end x
aAnd x
cCorresponding respectively threephase potential transformer conversion and control module (6) terminal row of inserting behind the short circuit; The secondary polar end a of tested three-phase combination transformer (8) voltage segment
x, b
x, c
xExcept that corresponding the access threephase potential transformer conversion and control module (6) terminal row respectively also will be distinguished corresponding access three-phase voltage Burden box (4); Corresponding respectively threephase potential transformer conversion and control module (6) terminal row, the terminal K of inserting of single-phase potential transformer tester (3) terminal a, x, D
uWith the x short circuit, single-phase potential transformer tester (3) is also wanted other ground connection; The threephase potential transformer conversion connects with control module (6) and single-phase potential transformer tester (3) connection and computer control and information management system (1).
3. testing device for high-voltage three-phase combination transformer according to claim 1, it is characterized in that: tested three-phase combination transformer (8) connects voltage transformer (VT) and three-phase or biphase current mutual inductor by Y and forms, and the integral type three-phase carries a polar end A of stepup transformer standard potential transformer (7)
0, B
0, C
0Respectively successively with the A of tested three-phase combination transformer (8) voltage segment
x, B
x, C
xEnd connects, and the integral type three-phase carries a non-polar end X of stepup transformer standard potential transformer (7)
A, X
B, X
CShort circuit, integral type three-phase carry the secondary non-polar end x of stepup transformer standard potential transformer (7)
a, x
b, x
cShort circuit, secondary polar end a
0, b
0, c
0Corresponding respectively threephase potential transformer conversion and control module (6) terminal row of inserting.
4. according to claim 1 or 2 or 3 described testing device for high-voltage three-phase combination transformer, it is characterized in that, also comprise threephase current transformer check test circuit, concrete structure comprises: computer control and information management system (1), single-phase current mutual-inductor tester (16), the zero-bit of current circuit and overload protection module (15), single-phase current Burden box (14), current transformer is with electronic three-phase regulator (13), threephase current transformer conversion and control module (12), A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure carries current lifting device standard current transformer (10), C phase high pressure carries current lifting device standard current transformer (9) and tested three-phase combination transformer (8) current segment; Its annexation is: zero-bit and the overload protection module (15) of three-phase supply by current circuit inserts current transformer with electronic three-phase regulator (13), current transformer with each phase line of electronic three-phase regulator (13) output respectively with A mutually high pressure carry current lifting device standard current transformer (11), B phase high pressure carries current lifting device standard current transformer (10) (two phase times then do not have the B phase), the end that C phase high pressure carries current lifting device part in the current lifting device standard current transformer (9) connects, current transformer with the zero line of electronic three-phase regulator (13) simultaneously with A mutually B phase C mutually each phase high pressure other end of carrying current lifting device part in the current lifting device standard current transformer connect, current transformer inserts threephase current transformer conversion and control module (12) terminal row with the motor line of electronic three-phase regulator (13); A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure and carries current lifting device standard current transformer (10), C phase high pressure and carry in the current lifting device standard current transformer (9) once polar end A
0P1, B
0P1, C
0P1 is connected with polar end AP1, BP1, the CP1 of tested three-phase combination transformer current segment respectively, and A phase B phase C mutually each phase high pressure carries in the current lifting device standard current transformer (two phase times then do not have the B phase) once non-polar end A
0P2, B
0P2, C
0P2 is connected with non-polar end AP2, BP2, the CP2 of tested three-phase combination transformer current segment respectively; A phase high pressure carries current lifting device standard current transformer (11), B phase high pressure and carries the polar end a that current lifting device standard current transformer (10), C phase high pressure carry secondary in the current lifting device standard current transformer (9)
0S1, b
0S1, c
0S1 and non-polar end a
0S2, b
0S2, c
0Corresponding respectively successively threephase current transformer conversion and control module (12) terminal row of inserting of S2; Also corresponding respectively successively threephase current transformer conversion and control module (12) terminal row of inserting of polar end aS1, the bS1 of tested three-phase combination transformer current segment secondary, cS1 and non-polar end aS2, bS2, cS2; The T of single-phase current mutual-inductor tester (16)
xTerminal inserts after the single-phase current Burden box (14) and T again
0Corresponding respectively threephase current transformer conversion and control module (12) terminal row of inserting of terminal K terminal, single-phase current mutual-inductor tester (16) is also wanted other ground connection; The threephase current transformer conversion connects with control module (12) and single-phase current mutual-inductor tester (16) connection and computer control and information management system (1); Capacitor C 11, pushbutton switch S2, resistance R 13, R14 form the low level reset circuit jointly and link to each other with the RST pin of AT89S52 single-chip microcomputer U11; Crystal oscillator Y2, capacitor C 9, C13 form oscillatory circuit jointly and link to each other with XTAL1, the XTAL2 pin of AT89S52 single-chip microcomputer U11; Capacitor C 10, C12, C14, C15, C16 and MAX232A serial ports conversion chip U10 form level shifting circuit, the level conversion of the P3.0 of AT89S52 single-chip microcomputer U11 and P3.1 are outputed to 2,3 mouthfuls of 9 needle serial port JX2; Computing machine is by 9 needle serial port JX2 control total system; Photoelectrical coupler U12 links to each other with resistance R 15, photoelectrical coupler U13 links to each other with resistance R 16, photoelectrical coupler U14 links to each other with resistance R 17, photoelectrical coupler U15 links to each other with resistance R 18, photoelectrical coupler U16 links to each other with resistance R 19, photoelectrical coupler U17 links to each other with resistance R 20, and P2.5, P2.4, P2.3, P2.2, P2.1, the P2.0 port with AT89S52 single-chip microcomputer U11 is connected to form six channel control circuits respectively; Relay K 10, K11, K12 are formed the break-make of self-locking and interlock circuit control contactor KM4, KM5, KM6, relay K A7, KA8, KA9, and by the light on and off demonstration on off operating mode of light emitting diode LDE4, LDE5, LDE6; Relay K A13 connects with button SB1 and controls the break-make of 5V control circuit general supply jointly; Relay K A14, KA15 interlocking connect the break-make of control contactor KM8, KM9.Combination switch SB7, SB8, position switch SQ7, SQ8 form control circuit control motor movement with contactor KM8, KM9; Contactor KM7, button SB6, position switch SQ5, SQ6 form control motor on-off circuit jointly; Relay K A7, KA8, KA9 interlocking connect the break-make of control contactor KM4, KM5, KM6; Contactor KM4, KM5, KM6 control terminal aS1, aS2, bS1, bS2, cS1, cS2, a
0S1, a
0S2, b
0S1, b
0S2, c
0S1, c
0S2, T
x, T
0, K
iBreak-make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201039499U CN201497802U (en) | 2009-07-28 | 2009-07-28 | High-voltage three-phase combined mutual inductor testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201039499U CN201497802U (en) | 2009-07-28 | 2009-07-28 | High-voltage three-phase combined mutual inductor testing device |
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| Publication Number | Publication Date |
|---|---|
| CN201497802U true CN201497802U (en) | 2010-06-02 |
Family
ID=42441006
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201039499U Expired - Lifetime CN201497802U (en) | 2009-07-28 | 2009-07-28 | High-voltage three-phase combined mutual inductor testing device |
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| Country | Link |
|---|---|
| CN (1) | CN201497802U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625403B (en) * | 2009-07-28 | 2012-02-01 | 山西省电力公司电力科学研究院 | Testing device for high-voltage three-phase combination transformer |
| CN103245930A (en) * | 2013-05-13 | 2013-08-14 | 国家电网公司 | Movable three-phase combined mutual inductor storage area verification system |
| CN103969540A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Method for testing wiring of secondary circuits of four-star voltage transformers |
| CN104764918A (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Three-phase combined type transformer based on orthogonal coordinate transformation output |
| CN104898083A (en) * | 2015-06-17 | 2015-09-09 | 国网四川省电力公司电力科学研究院 | Three phase mutual inductor check meter |
| CN109116288A (en) * | 2018-11-06 | 2019-01-01 | 云南电网有限责任公司电力科学研究院 | A kind of three-phase combination transformer calibrating installation |
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| CN101625403B (en) * | 2009-07-28 | 2012-02-01 | 山西省电力公司电力科学研究院 | Testing device for high-voltage three-phase combination transformer |
| CN103969540A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Method for testing wiring of secondary circuits of four-star voltage transformers |
| CN103969540B (en) * | 2013-01-30 | 2016-06-22 | 江苏省电力公司常州供电公司 | The method of testing of four wye voltage transformer secondary circuit wiring |
| CN103245930A (en) * | 2013-05-13 | 2013-08-14 | 国家电网公司 | Movable three-phase combined mutual inductor storage area verification system |
| CN103245930B (en) * | 2013-05-13 | 2015-09-30 | 国家电网公司 | A kind of moveable three-phase combination transformer warehouse district verification system |
| CN104764918A (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Three-phase combined type transformer based on orthogonal coordinate transformation output |
| CN104764918B (en) * | 2015-03-16 | 2017-12-22 | 中国计量学院 | Type three phase combined mutual-inductor based on orthogonal coordinate system conversion output |
| CN104898083A (en) * | 2015-06-17 | 2015-09-09 | 国网四川省电力公司电力科学研究院 | Three phase mutual inductor check meter |
| CN109116288A (en) * | 2018-11-06 | 2019-01-01 | 云南电网有限责任公司电力科学研究院 | A kind of three-phase combination transformer calibrating installation |
| CN111257818A (en) * | 2020-03-06 | 2020-06-09 | 云南电网有限责任公司电力科学研究院 | Metering performance verification system and method of combined metering device for distribution network |
| CN112735795A (en) * | 2020-12-07 | 2021-04-30 | 云南电网有限责任公司 | Standard three-phase combined mutual inductor |
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