CN103364754A - Method for automatically measuring direct-current resistor, short-circuit impedance, on-load switch and non-load voltage ratio of transformer - Google Patents
Method for automatically measuring direct-current resistor, short-circuit impedance, on-load switch and non-load voltage ratio of transformer Download PDFInfo
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- CN103364754A CN103364754A CN2013103014001A CN201310301400A CN103364754A CN 103364754 A CN103364754 A CN 103364754A CN 2013103014001 A CN2013103014001 A CN 2013103014001A CN 201310301400 A CN201310301400 A CN 201310301400A CN 103364754 A CN103364754 A CN 103364754A
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Abstract
The invention discloses a method for automatically measuring a direct-current resistor, a short-circuit impedance, an on-load switch and a non-load voltage ratio of a transformer. In the measurement process, the opening-and-closing status of a high-pressure switch can be controlled so as to achieve the status of a transformer winding in the measurement process, and the status is pressurization or an open circuit or a short circuit or grounding. The current measuring item is selected by controlling a multi-way selection switch, and the item is the direct-current resistor or the on-load tapping switch or the short-circuit impedance or the non-load voltage ratio. The method can achieve automatic measurement of the direct-current resistor, the on-load tapping switch, the non-load voltage ratio and the short-circuit impedance of the power transformer, the winding status is automatically switched in the whole measurement process, manual intervention is not required, the measurement error can be reduced, working intensity can be relieved, and working efficiency is improved.
Description
Technical field
The invention belongs to the power equipment field of measuring technique, relate to a kind of method that DC resistance of power transformer, load ratio bridging switch, short-circuit impedance and no-load voltage ratio are measured automatically.
Background technology
Power transformer is the major equipment of electric system, significant for reliably operation of power grid security, explicitly point out in 18 great electrical network anti-accident measures of national grid, strengthen load ratio bridging switch test and short-circuit impedance test for preventing that the great insulation fault of transformer from having great significance.In addition, direct current resistance test and no-load voltage ratio test are transformer requisite pilot projects behind handing-over, overhaul and change shunting switch as transformer conventionally test project, also are the important inspection items after the fault.
According to standard GB/T 50150-2006 " Erection works of electrical installations Standard for handover test of electric equipment " requirement, for the Transformer Winding with load ratio bridging switch, the direct current resistance of measuring winding and sleeve should carry out in all positions of each tap, and simultaneously non-tested winding requires open circuit; For multiwinding transformer, measuring voltage than the time should measure with the no-load voltage ratio of shunting switch winding to all taps of remaining winding; Also require all tap positions are measured when measuring each phase transition resistance of load ratio bridging switch and contact resistance, require simultaneously electric independently other side short circuit in winding and ground connection.As mentioned above, if four kinds of pilot projects of large-scale power transformer with a plurality of windings and shunting switch of complete measurement, just might need repeatedly to climb up transformer, tens of dismounting connecting lines, because high-power transformer is bulky, adopting manual type to disconnect p-wire not only wastes time and energy, but also the wiring that very likely makes a mistake, thereby causes error in the measurement even the hidden danger on the safety.
Summary of the invention
There is the problem that needs repeatedly to disconnect line in the process of the test during for present measurement DC resistance of power transformer, load ratio bridging switch, no-load voltage ratio and short-circuit impedance, the present invention proposes a kind of method of automatically measuring on the basis of digitized measurement.The method need not to disconnect line in measuring process, as long as connect line when beginning to test, just can automatically measure each test item parameter of transformer, and pilot process need not to disconnect line.
The present invention includes change-over switch module, multidiameter option switch, measurement module and motor drive mechanism control module, wherein measurement module comprises straight resistance measurement module, the measurement module of carrying is arranged, lacks resistance measurement module, no-load voltage ratio measurement module.The change-over switch module is used for the state of control transformer winding in measuring process: pressurization, open circuit, short circuit or ground connection; Multidiameter option switch is used for selecting the transformer measure the item: direct current resistance, load ratio bridging switch, short-circuit impedance or no-load voltage ratio; Straight resistance measurement module is used for the direct current resistance of measuring transformer winding; Have and carry a measurement module, be used for measuring transformer load ratio bridging switch mechanical property; Short resistance measurement module is used for measuring the Transformer Short Circuit Impedance under the low-voltage; The no-load voltage ratio measurement module is used for no-load voltage ratio and the polarity group of measuring transformer; The motor drive mechanism control module is used for load ratio bridging switch, automatically controls its motor drive mechanism action when directly resistance and no-load voltage ratio are measured.
Measuring method is as follows:
Step 1: judgement is three-winding transformer or two-winding transformer, if three-winding transformer is implemented in accordance with the following steps:
Step 2: with multidiameter option switch S1, S2, S3, S4 switch to straight resistance measurement module, and S5～S12 switches to vacant state.
Step 3:RL1, RL2, RL3 and RL4 switch to pressurized state, and RL14, RL15, RL16 and RL17 switch to on-state; RL5, RL6, RL7 and RL8, RL9, RL10, RL11 and RL12 switch to vacant state; RL18, RL19, RL20 and RL21, RL22, RL23, RL24 and RL25 switch to vacant state.
Step 4: measure the high pressure winding D.C. resistance by straight resistance measurement module, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, measure one time direct current resistance, finish the high pressure winding direct current resistance m easurem ent work under all tap positions.
Step 5: with multidiameter option switch S5, S6, S7, S8 switch to straight resistance measurement module, and S1～S4 and S9～S12 switch to vacant state.
Step 6:RL5, RL6, RL7 and RL8 switch to pressurized state, and RL18, RL19, RL20 and RL21 switch to on-state; RL1, RL2, RL3 and RL4, RL9, RL10, RL11 and RL12 switch to vacant state; RL14, RL15, RL16 and RL17, RL22, RL23, RL24 and RL25 switch to vacant state.
Step 7: by pressing winding D.C. resistance in the straight resistance measurement module measurement, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, measure one time direct current resistance, finish the middle pressure winding D.C. resistance surveying work under all tap positions.
Step 8: with multidiameter option switch S9, S10, S11, S12 switch to straight resistance measurement module, and S1～S8 switches to vacant state.
Step 9:RL9, RL10, RL11 and RL12 switch to pressurized state; RL22, RL23, RL24 and RL25 switch to on-state; RL1, RL2, RL3 and RL4, RL5, RL6, RL7 and RL8 switch to vacant state; RL14, RL15, RL16 and RL17, RL18, RL19, RL20 and RL21 switch to vacant state; Measure the low pressure winding D.C. resistance.
Step 10: with multidiameter option switch S1, S2, S3, S4 have switched to and have carried measurement module, and S5～S12 switches to vacant state.
Step 11:RL1, RL2, RL3 and RL4 switch to pressurized state; RL14, RL15, RL16 and RL17 switch to on-state; RL5, RL6, RL7 and RL8, RL9, RL10, RL11 and RL12 switch to short-circuit condition; Control grounding switch RL13 conducting makes all non-tested short circuit in winding and ground connection; RL18, RL19, RL20 and RL21, RL22, RL23, RL24 and RL25 switch to vacant state.
Step 12: by there being the measurement module of carrying to measure the high-pressure side load ratio bridging switch, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, there is the measurement module of carrying to measure once, finishes the surveying work of high-pressure side shunting switch under all tap positions.
Step 13: with multidiameter option switch S5, S6, S7, S8 have switched to and have carried measurement module, and S1～S4 and S9～S12 switch to vacant state.
Step 14:RL5, RL6, RL7 and RL8 switch to pressurized state; RL18, RL19, RL20 and RL21 switch to on-state; RL1, RL2, RL3 and RL4, RL9, RL10, RL11 and RL12 switch to short-circuit condition; Control grounding switch RL13 conducting makes all non-tested short circuit in winding and ground connection; RL14, RL15, RL16 and RL17, RL22, RL23, RL24 and RL25 switch to vacant state.
Step 15: by there being the measurement module of carrying to measure the medium voltage side load ratio bridging switch, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, there is the measurement module of carrying to measure once, finishes the surveying work of medium voltage side shunting switch under all tap positions.
Step 16: with multidiameter option switch S1, S2, S3, S4, S9, S10, S11, S12 switch to the no-load voltage ratio measurement module, and S5～S8 switches to vacant state.
Step 17:RL14, RL15, RL16 switch to on-state, and RL17 switches to vacant state; RL1, RL2, RL3 and RL4 switch to vacant state; RL22, RL23, RL24 switch to on-state, and RL25 switches to vacant state; RL9, RL10, RL11 and RL12 switch to vacant state; RL18, RL19, RL20 and RL21 switch to vacant state; RL5, RL6, RL7 and RL8 switch to vacant state.
Step 18: by no-load voltage ratio measurement module measuring transformer high pressure to low pressure winding no-load voltage ratio, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, the no-load voltage ratio measurement module is measured once, finishes high pressure under all tap positions to low pressure winding no-load voltage ratio surveying work.
Step 19: with multidiameter option switch S5, S6, S7, S8, S9, S10, S11, S12 switch to the no-load voltage ratio measurement module, and S1～S4 switches to vacant state.
Step 20:RL18, RL19, RL20 switch to on-state, and RL21 switches to vacant state; RL5, RL6, RL7 and RL8 switch to vacant state; RL22, RL23, RL24 switch to on-state, and RL25 switches to vacant state; RL9, RL10, RL11 and RL12 switch to vacant state; RL14, RL15, RL16 and RL17 switch to vacant state; RL1, RL2, RL3 and RL4 switch to vacant state.
Step 21: by pressing low pressure winding no-load voltage ratio in the no-load voltage ratio measurement module measuring transformer, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, the no-load voltage ratio measurement module is measured once, finishes middle pressure under all tap positions to low pressure winding no-load voltage ratio surveying work.
Step 22: with multidiameter option switch S1, S2, S3, S4, S5, S6, S7, S8 switch to short resistance measurement module, and S9～S12 switches to vacant state.
Step 23:RL1, RL2, RL3 and RL4 switch to pressurized state; RL14, RL15, RL16 and RL17 switch to on-state; RL5, RL6, RL7 and RL8 switch to pressurized state; RL18, RL19, RL20 and RL21 switch to on-state; RL9, RL10, RL11 and RL12 switch to the earth-free state of short circuit; RL22, RL23, RL24 and RL25 switch to vacant state; Finish the automatic surveying work of short-circuit impedance that high pressure centering is pressed winding.
Step 24: with multidiameter option switch S1, S2, S3, S4, S9, S10, S11, S12 switch to short resistance measurement module, and S5～S8 switches to vacant state.
Step 25:RL1, RL2, RL3 and RL4 switch to pressurized state; RL14, RL15, RL16 and RL17 switch to on-state; RL9, RL10, RL11 and RL12 switch to pressurized state; RL22, RL23, RL24 and RL25 switch to on-state; RL5, RL6, RL7 and RL8 switch to the earth-free state of short circuit; RL18, RL19, RL20 and RL21 switch to vacant state; Finish high pressure to the automatic surveying work of the short-circuit impedance of low pressure winding.
Step 26: with multidiameter option switch S5, S6, S7, S8, S9, S10, S11, S12 switch to short resistance measurement module, and S1～S4 switches to vacant state.
Step 27:RL5, RL6, RL7 and RL8 switch to pressurized state; RL18, RL19, RL20 and RL21 switch to on-state; RL9, RL10, RL11 and RL12 switch to pressurized state; RL22, RL23, RL24 and RL25 switch to on-state; RL1, RL2, RL3 and RL4 switch to the earth-free state of short circuit; RL14, RL15, RL16 and RL17 switch to vacant state; Finish middle pressure to the automatic surveying work of the short-circuit impedance of low pressure winding.
If two-winding transformer only need remove the measuring switch RL5 of corresponding middle pressure winding, RL6, RL7 and RL8, RL18, RL19, RL20 and RL21, and multidiameter option switch S5, S6, S7, S8, all the other steps and three-winding transformer are identical.
The invention has the beneficial effects as follows the automatic measurement that to realize DC resistance of power transformer, load ratio bridging switch, no-load voltage ratio and short-circuit impedance, whole measuring process automatic switchover winding state, need not manual intervention, can not only reduce measuring error, can also alleviate working strength, increase work efficiency.
Description of drawings
Fig. 1 is three winding power transformer wiring schematic diagrams;
Fig. 2 is that the high pressure winding directly hinders measuring switch switching synoptic diagram;
Fig. 3 is that middle pressure winding directly hinders measuring switch switching synoptic diagram;
Fig. 4 is that the low pressure winding directly hinders measuring switch switching synoptic diagram;
Fig. 5 is that the high pressure winding has the measuring switch switching figure of carrying;
Fig. 6 is that high pressure is to low pressure winding no-load voltage ratio measuring switch switching figure;
Fig. 7 is that middle pressure is to low pressure winding no-load voltage ratio measuring switch switching figure;
Fig. 8 is that high pressure centering is pressed the short resistance of winding measuring switch switching figure;
Fig. 9 is that high pressure is to the short resistance of low pressure winding measuring switch switching figure;
Figure 10 is that middle pressure is to the short resistance of low pressure winding Test Switchboard switching figure;
Figure 11 is double winding power transformer wiring diagram;
Figure 12 increases or reduces the measurement module synoptic diagram.
Among the figure, A, B, C, O are the transformer high-voltage winding, and Am, Bm, Cm, Om press winding in the transformer, and a, b, c, o are the transformer low voltage winding; VA, VB, VC, VO are high pressure winding voltage end, and VAm, VBm, VCm, VOm are middle pressure winding electric pressure side, and Va, Vb, Vc, Vo are low pressure winding electric pressure side; IA, IB, IC, IO are high pressure winding current terminal, and IAm, IBm, ICm, IOm are middle pressure winding current end, and Ia, Ib, Ic, Io are low pressure winding current end; RL1～RL25 is high-voltage switch gear; S1～S12 is multidiameter option switch.
Embodiment
The below illustrates as an example of three winding high-power transformers example and how automatically to measure.
The wiring diagram of Fig. 1 when measuring the directly resistance of large-scale three-winding transformer, load ratio bridging switch, short-circuit impedance and no-load voltage ratio be tested power transformer part in the dotted line frame 1, and dotted line frame 2 is interior to be summary of the invention.Each winding terminal that can see in the drawings transformer is divided into two-way, links to each other with a high-voltage switch gear respectively, and one the tunnel is voltage signal, and another road is current signal.In measuring process, can by the folding condition of control high-voltage switch gear, realize the state of Transformer Winding in measuring process: pressurization or open circuit or short circuit or ground connection.Select the project of current measurement by the control multidiameter option switch: direct current resistance or load ratio bridging switch or short-circuit impedance or no-load voltage ratio.Thereby in whole process of the test, select winding state and measure the item to replace artificial wiring by the control high-voltage switch gear, realize that by control tapping switch electric control module the automatic switchover of load ratio bridging switch tap position is two innovative points of the present invention.
1. measure straight resistance
(1) as shown in Figure 2, when measuring the high pressure YN winding with load ratio bridging switch, four switch RL1, RL2, RL3 and the RL4 that will connect respectively current terminal IA, IB, IC, IO switch to pressurized state; Four switch RL14, RL15, RL16 and RL17 connecting voltage end VA, VB, VC, VO switch to on-state;
(2) switch RL5, RL6, RL7 and the RL8 of the non-tested winding current end IAm of connection, IBm, ICm, IOm, Ia, Ib, Ic, Io, RL9, RL10, RL11 and RL12 switch to vacant state;
(3) switch RL18, RL19, RL20 and the RL21 of the non-tested winding electric pressure side VAm of connection, VBm, VCm, VOm, Va, Vb, Vc, Vo, RL22, RL23, RL24 and RL25 switch to vacant state;
(4) multidiameter option switch S1, S2, S3, S4 switch to straight resistance measurement module with IA, IB, IC, IO four road current signals and VA, VB, VC, VO four road voltage signals respectively, begin to measure;
(5) finish whenever once that straight resistance is measured and fully after the discharge, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, thereby finish the straight resistance surveying work of high pressure winding under all tap positions;
(6) as shown in Figure 3, when pressing winding in the measurement, four switch RL5, RL6, RL7 and the RL8 that will connect respectively current terminal IAm, IBm, ICm, IOm switch to pressurized state; Four switch RL18, RL19, RL20 and RL21 connecting voltage end VAm, VBm, VCm, VOm also switch to on-state;
(7) switch RL1, RL2, RL3 and the RL4 of the non-tested winding current end IA of connection, IB, IC, IO, Ia, Ib, Ic, Io, RL9, RL10, RL11 and RL12 switch to vacant state;
(8) switch RL14, RL15, RL16 and the RL17 of the non-tested winding electric pressure side VA of connection, VB, VC, VO, Va, Vb, Vc, Vo, RL22, RL23, RL24 and RL25 switch to vacant state;
(9) multidiameter option switch S5, S6, S7, S8 switch to straight resistance measurement module with IAm, IBm, ICm, IOm four road current signals and VAm, VBm, VCm, VOm four road voltage signals respectively, begin to measure;
(10) finish whenever once that straight resistance is measured and fully after the discharge, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, thereby finish the straight resistance surveying work of all lower pressure windings in tap position;
(11) as shown in Figure 4, when measuring the low pressure winding, four switch RL9, RL10, RL11 and the RL12 that will connect respectively current terminal Ia, Ib, Ic, Io switch to pressurized state; Four switch RL22, RL23, RL24 and RL25 connecting voltage end Va, Vb, Vc, Vo also switch to on-state;
(12) switch RL1, RL2, RL3 and the RL4 of the non-tested winding current end IA of connection, IB, IC, IO, IAm, IBm, ICm, IOm, RL5, RL6, RL7 and RL8 switch to vacant state;
(13) switch RL14, RL15, RL16 and the RL17 of the non-tested winding electric pressure side VA of connection, VB, VC, VO, VAm, VBm, VCm, VOm, RL18, RL19, RL20 and RL21 switch to vacant state;
(14) multidiameter option switch S9, S10, S11, S12 switch to straight resistance measurement module with Ia, Ib, Ic, Io four road current signals and Va, Vb, Vc, Vo four road voltage signals respectively, begin to measure;
(15) finish the automatic measurement of low pressure winding.
2. measurement load ratio bridging switch
(1) as shown in Figure 5, when measuring high pressure winding load ratio bridging switch electrical specification, four switch RL1, RL2, RL3 and the RL4 that will connect respectively current terminal IA, IB, IC, IO switch to pressurized state; Four switch RL14, RL15, RL16 and RL17 connecting voltage end VA, VB, VC, VO also switch to on-state;
(2) switch RL5, RL6, RL7 and the RL8 of the non-tested winding current end IAm of connection, IBm, ICm, IOm, Ia, Ib, Ic, Io, RL9, RL10, RL11 and RL12 switch to short-circuit condition; Control grounding switch RL13 conducting makes all non-tested short circuit in winding and ground connection;
(3) switch RL18, RL19, RL20 and the RL21 of the non-tested winding electric pressure side VAm of connection, VBm, VCm, VOm, Va, Vb, Vc, Vo, RL22, RL23, RL24 and RL25 switch to vacant state;
(4) multidiameter option switch S1, S2, S3, S4 have switched to IA, IB, IC, IO four road current signals and VA, VB, VC, VO four road voltage signals respectively and have carried measurement module, begin to measure;
(5) whenever finish load ratio bridging switch and measure after, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, thereby finish the surveying work of all tap positions.
When (6) pressing winding load ratio bridging switch electrical specification in the measurement, four switch RL5, RL6, RL7 and the RL8 that will connect respectively current terminal IAm, IBm, ICm and IOm switch to pressurized state; Four switch RL18, RL19, RL20 and RL21 connecting voltage end VAm, VBm, VCm and VOm switch to on-state;
(7) switch RL1, RL2, RL3 and the RL4 of the non-tested winding current end IA of connection, IB, IC, IO, Ia, Ib, Ic, Io, RL9, RL10, RL11 and RL12 switch to short-circuit condition; Control grounding switch RL13 conducting makes all non-tested short circuit in winding and ground connection;
(8) switch RL14, RL15, RL16 and the RL17 of the non-tested winding electric pressure side VA of connection, VB, VC, VO, Va, Vb, Vc, Vo, RL22, RL23, RL24 and RL25 switch to vacant state;
(9) multidiameter option switch S5, S6, S7, S8 have switched to IAm, IBm, ICm, IOm four road current signals and VAm, VBm, VCm, VOm four road voltage signals respectively and have carried measurement module, begin to measure;
(10) whenever finish load ratio bridging switch and measure after, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, thereby finish the surveying work of all tap positions.
3. measurement no-load voltage ratio
(1) as shown in Figure 6, measurement is with the high pressure winding of load ratio bridging switch during to low pressure winding no-load voltage ratio, three switch RL14, RL15, the RL16 that will connect respectively high pressure winding voltage end VA, VB, VC switch to on-state, and the switch RL17 that connects voltage end V0 switches to vacant state; Four switch RL1, RL2, RL3 and RL4 connecting high pressure winding current terminal IA, IB, IC, IO switch to vacant state; Three switch RL22, RL23, RL24 connecting low pressure winding electric pressure side Va, Vb, Vc switch to on-state, and the switch RL25 that connects voltage end Vo switches to vacant state; Switch RL9, the RL10, RL11 and the RL12 that connect low pressure winding current end Ia, Ib, Ic, Io switch to vacant state;
(2) press switch RL18, RL19, RL20 and the RL21 of winding electric pressure side VAm, VBm, VCm, VOm to switch to vacant state in the connection; Press switch RL5, RL6, RL7 and the RL8 of winding current end IAm, IBm, ICm, IOm to switch to vacant state in the connection;
(3) multidiameter option switch S1, S2, S3, S4, S9, S10, S11, S12 switch to the no-load voltage ratio measurement module with VA, VB, VC, VO four road voltage signals and Va, Vb, Vc, Vo four road voltage signals respectively, begin to measure;
(4) whenever finish a sub-high pressure low pressure winding no-load voltage ratio measured after, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, thereby finish the automatic surveying work of no-load voltage ratio under all tap positions;
(5) as shown in Figure 7, measurement is with the middle pressure winding of load ratio bridging switch during to low pressure winding no-load voltage ratio, press three switch RL18, RL19, the RL20 of winding electric pressure side VAm, VBm, VCm to switch to on-state in will connecting respectively, the switch RL21 that connects voltage end VOm switches to vacant state; Press four switch RL5, RL6, RL7 and the RL8 of winding current end IAm, IBm, ICm, IOm to switch to vacant state in the connection; Three switch RL22, RL23, RL24 connecting low pressure winding electric pressure side Va, Vb, Vc switch to on-state, and the switch RL25 that connects voltage end Vo switches to vacant state; Switch RL9, the RL10, RL11 and the RL12 that connect low pressure winding current end Ia, Ib, Ic, Io switch to vacant state;
(6) switch RL14, RL15, RL16 and the RL17 of connection high pressure winding voltage end VA, VB, VC, VO switch to vacant state; Switch RL1, the RL2, RL3 and the RL4 that connect high pressure winding current terminal IA, IB, IC, IO switch to vacant state;
(7) multidiameter option switch S5, S6, S7, S8, S9, S10, S11, S12 switch to the no-load voltage ratio measurement module with VAm, VBm, VCm, VOm four road voltage signals and Va, Vb, Vc, Vo four road voltage signals respectively, begin to measure;
(8) press in whenever finishing once low pressure winding no-load voltage ratio measured after, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, thereby finish the automatic surveying work of no-load voltage ratio under all tap positions.
4. measurement short-circuit impedance
(1) as shown in Figure 8, when measuring the impedance of high pressure winding centering pressure short circuit in winding, four switch RL1, RL2, RL3 and the RL4 that will connect respectively current terminal IA, IB, IC, IO switch to pressurized state; Four switch RL14, RL15, RL16 and RL17 connecting voltage end VA, VB, VC, VO also switch to on-state; Press switch RL5, RL6, RL7 and the RL8 of winding current end IAm, IBm, ICm, IOm to switch to pressurized state in the connection; Press switch RL18, RL19, RL20 and the RL21 of winding electric pressure side VAm, VBm, VCm, VOm to switch to on-state in the connection;
(2) four switch RL9, RL10, RL11 and the RL12 of connection low pressure winding current end Ia, Ib, Ic, Io switch to the earth-free state of short circuit; Four switch RL22, RL23, RL24 and RL25 connecting voltage end Va, Vb, Vc, Vo also switch to vacant state;
(3) multidiameter option switch S1, S2, S3, S4, S5, S6, S7, S8 be respectively with VA, VB, VC, VO four road voltage signals, IA, IB, IC, IO four road current signals and VAm, VBm, VCm, VOm four road voltage signals, IAm, IBm, ICm, IOm four road current signals switch to short resistance measurement module, begin to measure;
(4) finish the automatic surveying work of short-circuit impedance that high pressure winding centering is pressed winding;
(5) as shown in Figure 9, when measuring the high pressure winding to the impedance of low pressure short circuit in winding, four switch RL1, RL2, RL3 and the RL4 that will connect respectively current terminal IA, IB, IC, IO switch to pressurized state; Four switch RL14, RL15, RL16 and RL17 connecting voltage end VA, VB, VC, VO also switch to on-state; Switch RL9, the RL10, RL11 and the RL12 that connect low pressure winding current end Ia, Ib, Ic, Io switch to pressurized state; Switch RL22, the RL23, RL24 and the RL25 that connect low pressure winding electric pressure side Va, Vb, Vc, Vo switch to on-state;
(6) press four switch RL5, RL6, RL7 and the RL8 of winding current end IAm, IBm, ICm, IOm to switch to the earth-free state of short circuit in the connection; Four switch RL18, RL19, RL20 and RL21 connecting voltage end VAm, VBm, VCm, VOm also switch to vacant state;
(7) multidiameter option switch S1, S2, S3, S4, S9, S10, S11, S12 be respectively with VA, VB, VC, VO four road voltage signals, IA, IB, IC, IO four road current signals and Va, Vb, Vc, Vo four road voltage signals, Ia, Ib, Ic, Io four road current signals switch to short resistance measurement module, begin to measure;
(8) finish the high pressure winding to the automatic surveying work of the short-circuit impedance of low pressure winding;
(9) as shown in figure 10, when pressing winding to the impedance of low pressure short circuit in winding in the measurement, four switch RL5, RL6, RL7 and the RL8 that will connect respectively current terminal IAm, IBm, ICm, IOm switch to pressurized state; Four switch RL18, RL19, RL20 and RL21 connecting voltage end VAm, VBm, VCm, VOm also switch to on-state; Switch RL9, the RL10, RL11 and the RL12 that connect low pressure winding current end Ia, Ib, Ic, Io switch to pressurized state; Switch RL22, the RL23, RL24 and the RL25 that connect low pressure winding electric pressure side Va, Vb, Vc, Vo switch to on-state;
(10) four switch RL1, RL2, RL3 and the RL4 of connection high pressure winding current terminal IA, IB, IC, IO switch to the earth-free state of short circuit; Four switch RL14, RL15, RL16 and RL17 connecting voltage end VA, VB, VC, VO also switch to vacant state;
(11) multidiameter option switch S5, S6, S7, S8, S9, S10, S11, S12 be respectively with VAm, VBm, VCm, VOm four road voltage signals, IAm, IBm, ICm, IOm four road current signals and Va, Vb, Vc, Vo four road voltage signals, Ia, Ib, Ic, Io four road current signals switch to short resistance measurement module, begin to measure;
(12) finish middle pressure winding to the automatic surveying work of the short-circuit impedance of low pressure winding.
For two-winding transformer, Figure 11 just can realize automatic measurement, only needs the corresponding measuring switch RL5 of middle pressure winding, RL6, RL7 and RL8, RL18, RL19, RL20 and RL21, and multidiameter option switch S5, S6, S7, the S8 of removing.
For measurement module, can increase arbitrarily or reduce, only need corresponding increase or reduce multidiameter option switch, Figure 12 illustrates this function to remove the no-load voltage ratio measurement module as example.
Claims (3)
1. the resistance of automatic measuring transformer value, short resistance, have carry, the method for no-load voltage ratio, the used module of the method comprises change-over switch module, multidiameter option switch, measurement module and motor drive mechanism control module; Wherein measurement module comprises straight resistance measurement module, the measurement module of carrying is arranged, lacks resistance measurement module and no-load voltage ratio measurement module;
Described change-over switch module is used for the state of control transformer winding in measuring process: pressurization, open circuit, short circuit or ground connection;
Described multidiameter option switch is used for selecting the transformer measure the item: direct current resistance, load ratio bridging switch, short-circuit impedance or no-load voltage ratio;
Described straight resistance measurement module is used for the direct current resistance of measuring transformer winding;
Described have carry a measurement module, be used for measuring transformer load ratio bridging switch mechanical property;
Described short resistance measurement module is used for measuring the Transformer Short Circuit Impedance under the low-voltage;
Described no-load voltage ratio measurement module is used for no-load voltage ratio and the polarity group of measuring transformer;
Described motor drive mechanism control module is used for load ratio bridging switch, automatically controls its motor drive mechanism action when directly resistance and no-load voltage ratio are measured, and it is characterized in that the method is specifically:
Step 1: judgement is three-winding transformer or two-winding transformer, if three-winding transformer is then carried out following steps:
Step 2: with multidiameter option switch S1, S2, S3, S4 switch to straight resistance measurement module, and S5～S12 switches to vacant state;
Step 3: high-voltage switch gear RL1, RL2, RL3 and RL4 switch to pressurized state, and RL14, RL15, RL16 and RL17 switch to on-state; RL5, RL6, RL7 and RL8, RL9, RL10, RL11 and RL12 switch to vacant state; RL18, RL19, RL20 and RL21, RL22, RL23, RL24 and RL25 switch to vacant state;
Step 4: measure the high pressure winding D.C. resistance by straight resistance measurement module, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, measure one time direct current resistance, finish the high pressure winding direct current resistance m easurem ent work under all tap positions;
Step 5: with multidiameter option switch S5, S6, S7, S8 switch to straight resistance measurement module, and S1～S4 and S9～S12 switch to vacant state;
Step 6: high-voltage switch gear RL5, RL6, RL7 and RL8 switch to pressurized state, and RL18, RL19, RL20 and RL21 switch to on-state; RL1, RL2, RL3 and RL4, RL9, RL10, RL11 and RL12 switch to vacant state; RL14, RL15, RL16 and RL17, RL22, RL23, RL24 and RL25 switch to vacant state;
Step 7: by pressing winding D.C. resistance in the straight resistance measurement module measurement, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, measure one time direct current resistance, finish the middle pressure winding D.C. resistance surveying work under all tap positions;
Step 8: with multidiameter option switch S9, S10, S11, S12 switch to straight resistance measurement module, and S1～S8 switches to vacant state;
Step 9: high-voltage switch gear RL9, RL10, RL11 and RL12 switch to pressurized state; RL22, RL23, RL24 and RL25 switch to on-state; RL1, RL2, RL3 and RL4, RL5, RL6, RL7 and RL8 switch to vacant state; RL14, RL15, RL16 and RL17, RL18, RL19, RL20 and RL21 switch to vacant state; Measure the low pressure winding D.C. resistance;
Step 10: with multidiameter option switch S1, S2, S3, S4 have switched to and have carried measurement module, and S5～S12 switches to vacant state;
Step 11: high-voltage switch gear RL1, RL2, RL3 and RL4 switch to pressurized state; RL14, RL15, RL16 and RL17 switch to on-state; RL5, RL6, RL7 and RL8, RL9, RL10, RL11 and RL12 switch to short-circuit condition; Control grounding switch RL13 conducting makes all non-tested short circuit in winding and ground connection; RL18, RL19, RL20 and RL21, RL22, RL23, RL24 and RL25 switch to vacant state;
Step 12: by there being the measurement module of carrying to measure the high-pressure side load ratio bridging switch, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, there is the measurement module of carrying to measure once, finishes the surveying work of high-pressure side shunting switch under all tap positions;
Step 13: with multidiameter option switch S5, S6, S7, S8 have switched to and have carried measurement module, and S1～S4 and S9～S12 switch to vacant state;
Step 14: high-voltage switch gear RL5, RL6, RL7 and RL8 switch to pressurized state; RL18, RL19, RL20 and RL21 switch to on-state; RL1, RL2, RL3 and RL4, RL9, RL10, RL11 and RL12 switch to short-circuit condition; Control grounding switch RL13 conducting makes all non-tested short circuit in winding and ground connection; RL14, RL15, RL16 and RL17, RL22, RL23, RL24 and RL25 switch to vacant state;
Step 15: by there being the measurement module of carrying to measure the medium voltage side load ratio bridging switch, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, there is the measurement module of carrying to measure once, finishes the surveying work of medium voltage side shunting switch under all tap positions;
Step 16: with multidiameter option switch S1, S2, S3, S4, S9, S10, S11, S12 switch to the no-load voltage ratio measurement module, and S5～S8 switches to vacant state;
Step 17:RL14, RL15, RL16 switch to on-state, and RL17 switches to vacant state; RL1, RL2, RL3 and RL4 switch to vacant state; RL22, RL23, RL24 switch to on-state, and RL25 switches to vacant state; RL9, RL10, RL11 and RL12 switch to vacant state; RL18, RL19, RL20 and RL21 switch to vacant state; RL5, RL6, RL7 and RL8 switch to vacant state;
Step 18: by no-load voltage ratio measurement module measuring transformer high pressure to low pressure winding no-load voltage ratio, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, the no-load voltage ratio measurement module is measured once, finishes high pressure under all tap positions to low pressure winding no-load voltage ratio surveying work;
Step 19: with multidiameter option switch S5, S6, S7, S8, S9, S10, S11, S12 switch to the no-load voltage ratio measurement module, and S1～S4 switches to vacant state;
Step 20: high-voltage switch gear RL18, RL19, RL20 switch to on-state, and RL21 switches to vacant state; RL5, RL6, RL7 and RL8 switch to vacant state; RL22, RL23, RL24 switch to on-state, and RL25 switches to vacant state; RL9, RL10, RL11 and RL12 switch to vacant state; RL14, RL15, RL16 and RL17 switch to vacant state; RL1, RL2, RL3 and RL4 switch to vacant state;
Step 21: by pressing low pressure winding no-load voltage ratio in the no-load voltage ratio measurement module measuring transformer, switch successively to most significant digit from lowest order by motor drive mechanism control module operation load ratio bridging switch, tap position of every switching, the no-load voltage ratio measurement module is measured once, finishes middle pressure under all tap positions to low pressure winding no-load voltage ratio surveying work;
Step 22: with multidiameter option switch S1, S2, S3, S4, S5, S6, S7, S8 switch to short resistance measurement module, and S9～S12 switches to vacant state;
Step 23: high-voltage switch gear RL1, RL2, RL3 and RL4 switch to pressurized state; RL14, RL15, RL16 and RL17 switch to on-state; RL5, RL6, RL7 and RL8 switch to pressurized state; RL18, RL19, RL20 and RL21 switch to on-state; RL9, RL10, RL11 and RL12 switch to the earth-free state of short circuit; RL22, RL23, RL24 and RL25 switch to vacant state; Finish the automatic surveying work of short-circuit impedance that high pressure centering is pressed winding;
Step 24: with multidiameter option switch S1, S2, S3, S4, S9, S10, S11, S12 switch to short resistance measurement module, and S5～S8 switches to vacant state;
Step 25: high-voltage switch gear RL1, RL2, RL3 and RL4 switch to pressurized state; RL14, RL15, RL16 and RL17 switch to on-state; RL9, RL10, RL11 and RL12 switch to pressurized state; RL22, RL23, RL24 and RL25 switch to on-state; RL5, RL6, RL7 and RL8 switch to the earth-free state of short circuit; RL18, RL19, RL20 and RL21 switch to vacant state; Finish high pressure to the automatic surveying work of the short-circuit impedance of low pressure winding;
Step 26: with multidiameter option switch S5, S6, S7, S8, S9, S10, S11, S12 switch to short resistance measurement module, and S1～S4 switches to vacant state;
Step 27: high-voltage switch gear RL5, RL6, RL7 and RL8 switch to pressurized state; RL18, RL19, RL20 and RL21 switch to on-state; RL9, RL10, RL11 and RL12 switch to pressurized state; RL22, RL23, RL24 and RL25 switch to on-state; RL1, RL2, RL3 and RL4 switch to the earth-free state of short circuit; RL14, RL15, RL16 and RL17 switch to vacant state; Finish middle pressure to the automatic surveying work of the short-circuit impedance of low pressure winding;
If two-winding transformer only need remove the measuring high-voltage switch gear RL5 of corresponding middle pressure winding, RL6, RL7 and RL8, RL18, RL19, RL20 and RL21, and multidiameter option switch S5, S6, S7, S8, all the other steps and three-winding transformer are identical.
2. method according to claim 1 is characterized in that: the change-over switch module is according to the measurement process, in real time the state of switching transformer winding: pressurization or open circuit or short circuit or ground connection.
3. method according to claim 1 is characterized in that: the motor drive mechanism control module is being carried out load ratio bridging switch, directly when resistance and no-load voltage ratio test, is being realized automatically adjusting the tap position by the action of control motor drive mechanism to transformer.
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