CN103884915A - Device and method for automatically measuring direct-current resistance of windings of power transformers - Google Patents
Device and method for automatically measuring direct-current resistance of windings of power transformers Download PDFInfo
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- CN103884915A CN103884915A CN201410068626.6A CN201410068626A CN103884915A CN 103884915 A CN103884915 A CN 103884915A CN 201410068626 A CN201410068626 A CN 201410068626A CN 103884915 A CN103884915 A CN 103884915A
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Abstract
The invention relates to a device and method for automatically measuring the direct-current resistance of windings of power transformers. The device comprises a main controller U1, a direct-current resistance measurement module U2, a selector switch module U3 and an electric mechanism controller U4. The electric mechanism controller U4 comprises a power module U4-1, a control increase module U4-2, a control decrease module U4-3 and a time delay module U4-4. The method includes the step of measuring the direct-current resistance of the windings of the power transformer with two windings and the step of measuring the direct-current resistance of the windings of the power transformer with three windings. The device and method have the advantages that the direct-current resistance of the power transformers can be automatically measured, no manual operation is needed for operating a test instrument and replacing a test wire in the whole test process, test efficiency is greatly improved, test time is saved, work intensity is lowered, and work efficiency is improved.
Description
Technical field
The invention belongs to power equipment field of measuring technique, relate to a kind of device and measuring method of automatic measurement power transformer winding D. C. resistance.
Background technology
Power transformer is the major equipment of electric system, significant for power grid security operation reliably, in 18 great electrical network anti-accident measures of national grid, explicitly point out, DC resistance of power transformer is tested as transformer conventionally test project, being transformer requisite pilot project after handing-over, overhaul and change shunting switch, is also the important inspection item after 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 on all positions of each tap, and simultaneously non-tested winding requires open circuit.As mentioned above, if intactly measure the resistance of the large-scale power transformer value with a multiple windings and shunting switch pilot project, just likely need repeatedly to climb up transformer, tens of dismounting connecting lines, because high-power transformer is bulky, adopt manual type to disconnect p-wire and not only waste time and energy, but also the wiring that very likely makes a mistake, thereby cause the even hidden danger in safety of error in measurement.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of device of automatic measurement power transformer winding D. C. resistance without disconnect line in middle measuring process.
For solving the problems of the technologies described above taked technical scheme be: a kind of device of automatic measurement power transformer winding D. C. resistance, comprises master controller U1, directly hinders measurement module U2, change-over switch module U3 and motor drive mechanism controller U4; Described motor drive mechanism controller U4 comprises power module U4-1, rises control module U4-2, falls control module U4-3 and time delay module U4-4;
The winding casing tube outlet terminal of power transformer T connects the corresponding port of described straight resistance measurement module U2 through meeting described change-over switch module U3; The two-way connection of corresponding PORT COM of the PORT COM of described straight resistance measurement module U2 and described master controller U1; Described power module U4-1, rise control module U4-2, corresponding PORT COM that the control signal input end that falls control module U4-3, time delay module U4-4 and change-over switch module U3 meets respectively described master controller U1; Described power module U4-1, rise control module U4-2, respective input that the control signal output terminal that falls control module U4-3 and time delay module U4-4 meets respectively the load ratio bridging switch motor drive mechanism FJKG of power transformer T.
Described change-over switch module U3 comprises relay J 1-J25;
The swing arm J1-1 of described relay J 1 meets the high pressure A phase winding sleeve pipe outlet terminal A of power transformer T
h; The stationary contact J1-2 of described relay J 1 meets the high pressure A phase current signal output terminal IAH of described straight resistance measurement module U2;
The stationary contact J1-3 of described relay J 1 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J14-1 of described relay J 14
h; The high pressure A phase voltage signal output terminal VAH of straight resistance measurement module U2 described in another termination of the normally closed contact J14-1 of described relay J 14; The normally opened contact J14-2 of described relay J 14 is unsettled;
The swing arm J2-1 of described relay J 2 meets the high pressure B phase winding sleeve pipe outlet terminal B of power transformer T
h; The stationary contact J2-2 of described relay J 2 meets the high pressure B phase current signal output terminal IBH of described straight resistance measurement module U2;
The stationary contact J2-3 of described relay J 2 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J15-1 of described relay J 15
h; The high pressure B phase voltage signal output terminal VBH of straight resistance measurement module U2 described in another termination of the normally closed contact J15-1 of described relay J 15; The normally opened contact J15-2 of described relay J 15 is unsettled;
The swing arm J3-1 of described relay J 3 meets the high pressure C phase winding sleeve pipe outlet terminal C of power transformer T
h; The stationary contact J3-2 of described relay J 3 meets the high pressure C phase current signal output terminal ICH of described straight resistance measurement module U2;
The stationary contact J3-3 of described relay J 3 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J16-1 of described relay J 16
h; The high pressure C phase voltage signal output terminal VCH of straight resistance measurement module U2 described in another termination of the normally closed contact J16-1 of described relay J 16; The normally opened contact J16-2 of described relay J 16 is unsettled;
The swing arm J4-1 of described relay J 4 meets the high pressure neutral bushing outlet terminal O of power transformer T
h; The stationary contact J4-2 of described relay J 4 meets the high pressure neutral point current signal input part IOH of described straight resistance measurement module U2;
The stationary contact J4-3 of described relay J 4 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J17-1 of described relay J 17
h; The high pressure neutral point voltage signal input part VOH of straight resistance measurement module U2 described in another termination of the normally closed contact J17-1 of described relay J 17; The normally opened contact J17-2 of described relay J 17 is unsettled;
The swing arm J5-1 of described relay J 5 meets the middle pressure A phase winding sleeve pipe outlet terminal A of power transformer T
m; The stationary contact J5-2 of described relay J 5 meets the middle pressure A phase current signal output terminal IAM of described straight resistance measurement module U2;
The stationary contact J5-3 of described relay J 5 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J18-1 of described relay J 18
m; The middle pressure A phase voltage signal output terminal VAM of straight resistance measurement module U2 described in another termination of the normally closed contact J18-1 of described relay J 18; The normally opened contact J18-2 of described relay J 18 is unsettled;
The swing arm J6-1 of described relay J 6 meets the middle pressure B phase winding sleeve pipe outlet terminal B of power transformer T
m; The stationary contact J6-2 of described relay J 6 meets the middle pressure B phase current signal output terminal IBM of described straight resistance measurement module U2;
The stationary contact J6-3 of described relay J 6 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J19-1 of described relay J 19
m; The middle pressure B phase voltage signal output terminal VBM of straight resistance measurement module U2 described in another termination of the normally closed contact J19-1 of described relay J 19; The normally opened contact J19-2 of described relay J 19 is unsettled;
The swing arm J7-1 of described relay J 7 meets the middle pressure C phase winding sleeve pipe outlet terminal C of power transformer T
m; The stationary contact J7-2 of described relay J 7 meets the middle pressure C phase current signal output terminal ICM of described straight resistance measurement module U2;
The stationary contact J7-3 of described relay J 7 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J20-1 of described relay J 20
m; The middle pressure C phase voltage signal output terminal VCM of straight resistance measurement module U2 described in another termination of the normally closed contact J20-1 of described relay J 20; The normally opened contact J20-2 of described relay J 20 is unsettled;
The swing arm J8-1 of described relay J 8 meets the middle pressure neutral bushing outlet terminal O of power transformer T
m; The stationary contact J8-2 of described relay J 8 meets the middle pressure neutral point current signal input part IOM of described straight resistance measurement module U2;
The stationary contact J8-3 of described relay J 8 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J21-1 of described relay J 21
m; The middle pressure neutral point voltage signal input part VOM of straight resistance measurement module U2 described in another termination of the normally closed contact J21-1 of described relay J 21; The normally opened contact J21-2 of described relay J 21 is unsettled;
The swing arm J9-1 of described relay J 9 meets the low pressure A phase winding sleeve pipe outlet terminal A of power transformer T
l; The stationary contact J9-2 of described relay J 9 meets the low pressure A phase current signal output terminal IAL of described straight resistance measurement module U2;
The stationary contact J9-3 of described relay J 9 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J22-1 of described relay J 22
l; The low pressure A phase voltage signal output terminal VAL of straight resistance measurement module U2 described in another termination of the normally closed contact J22-1 of described relay J 22; The normally opened contact J22-2 of described relay J 22 is unsettled;
The swing arm J10-1 of described relay J 10 meets the low pressure B phase winding sleeve pipe outlet terminal B of power transformer T
l; The stationary contact J10-2 of described relay J 10 meets the low pressure B phase current signal output terminal IBL of described straight resistance measurement module U2;
The stationary contact J10-3 of described relay J 10 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J23-1 of described relay J 23
l; The low pressure B phase voltage signal output terminal VBL of straight resistance measurement module U2 described in another termination of the normally closed contact J23-1 of described relay J 23; The normally opened contact J23-2 of described relay J 23 is unsettled;
The swing arm J11-1 of described relay J 11 meets the low pressure C phase winding sleeve pipe outlet terminal C of power transformer T
l; The stationary contact J11-2 of described relay J 11 meets the low pressure C phase current signal output terminal ICL of described straight resistance measurement module U2;
The stationary contact J11-3 of described relay J 11 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J24-1 of described relay J 24
l; The low pressure C phase voltage signal output terminal VCL of straight resistance measurement module U2 described in another termination of the normally closed contact J24-1 of described relay J 24; The normally opened contact J24-2 of described relay J 24 is unsettled;
The swing arm J12-1 of described relay J 12 meets the low pressure neutral bushing outlet terminal O of power transformer T
l; The stationary contact J12-2 of described relay J 12 meets the low pressure neutral point current signal input part IOL of described straight resistance measurement module U2;
The stationary contact J12-3 of described relay J 12 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J25-1 of described relay J 25
l; The low pressure neutral point voltage signal input part VOL of straight resistance measurement module U2 described in another termination of the normally closed contact J25-1 of described relay J 25; The normally opened contact J25-2 of described relay J 25 is unsettled;
The control signal input end of the coil of described relay J 1-J25 connects respectively the corresponding PORT COM of described master controller U1.
The model of described master controller U1 is for grinding auspicious T90; The model of described straight resistance measurement module U2 is dr-m; The model of described relay J 1-J25 is G7L-2A-P; Described power module U4-1 is pow-m; The described control module U4-2 that rises is upctl-m; It is described that to fall control module U4-3 be dnctl-m; Described time delay module U4-4 is tdl-m.
The measuring method of power transformer winding D. C. resistance comprises the steps:
step 1obtaining the maximum tap position of the type of tested power transformer, the specified tap of tested tapping switch for electric power transformer position, tested tapping switch for electric power transformer and minimum tap position, preset high-pressure by described master controller U1 measures tap position and counts N1 and middle pressure and measure tap position and count N2; If double winding power transformer goes to step 2; If three winding power transformers go to step 3;
step 2double winding Winding in Power Transformer directly hinders measurement;
(1) step of measurement high pressure winding D.C. resistance;
step 2-1described master controller U1 controls described change-over switch module U3 and switches, and power transformer high pressure A phase winding sleeve pipe outlet terminal is communicated with the high pressure A phase signals output terminal of described straight resistance measurement module U2 through described change-over switch module U3; Power transformer high pressure A phase neutral bushing outlet terminal is communicated with the high pressure neutral point signal input part of described straight resistance measurement module U2 through described change-over switch module U3;
step 2-2described master controller is notified described straight resistance measurement module U2 output direct current continuous current, described straight resistance measurement module U2 read input current value and measure high pressure A phase winding sleeve pipe outlet terminal and high pressure neutral bushing outlet terminal between magnitude of voltage, according to described magnitude of voltage and current value, described straight resistance measurement module U2 calculates the A phase high pressure winding DC resistance under this tap position, and described DC resistance is transferred to described master controller U1, show or print, after measurement finishes, master controller U1 controls and closes experiment power supply, carries out extinguishing arc;
step 2-3described master controller U1 controls described change-over switch module U3 and switches, and adopts the method same with step 2-1 and step 2-2 to measure respectively the DC resistance of high pressure B phase and C phase winding;
step 2-4measure after the direct current resistance of high pressure winding of a tap position, described master controller U1 counts N1 by described measurement tap position and subtracts 1, and judges whether N1-1 equals preset value; If N1-1 is greater than preset value, described master controller U1 controls described motor drive mechanism control module U4, make it control power transformer load tap changer motor drive mechanism and switch next tap position, then adopt the method identical with step 2-1 ~ 2-3 to measure the DC resistance of A, B under this tap, C three-phase high-voltage winding; If N1-1 equals preset value, finish the measurement of high pressure winding D.C. resistance;
(2) step of measurement low pressure winding D.C. resistance;
step 2-5described master controller U1 controls described change-over switch module U3, and power transformer low pressure A phase winding sleeve pipe outlet terminal is communicated with the low pressure A phase signals output terminal of described straight resistance measurement module U2 through described change-over switch module U3; Power transformer low pressure A phase neutral bushing outlet terminal is communicated with the low pressure neutral point signal input part of described straight resistance measurement module U2 through described change-over switch module U3;
step 2-6described master controller U1 controls described straight resistance measurement module U2 output direct current continuous current, described straight resistance measurement module U2 read input current value and measure low pressure A phase winding sleeve pipe outlet terminal and low pressure neutral bushing outlet terminal between magnitude of voltage, described straight resistance measurement module U2 calculates A phase low pressure winding D.C. resistance value, and described DC resistance is transferred to described master controller U1; After measurement finishes, described master controller U1 controls and closes experiment power supply, carries out extinguishing arc;
step 2-7described master controller U1 controls described change-over switch module, adopts the method same with step 2-5 and step 2-6 to measure respectively the DC resistance of low pressure B phase and C phase winding;
step 3three winding power transformer windings directly hinder measurement;
The step of high pressure winding D.C. resistance of measuring three winding power transformers is identical with described step 2-1～step 2-4; The step of low pressure winding D.C. resistance of measuring three winding power transformers is identical with described step 2-5～step 2-7;
The step of middle pressure winding D.C. resistance of measuring three winding power transformers is as follows:
step 3-1described master controller U1 controls described change-over switch module U3 and switches, and makes to press A phase winding sleeve pipe outlet terminal to be communicated with the middle pressure A phase signals output terminal of described straight resistance measurement module U2 through described change-over switch module U3 in power transformer; Make to press A phase neutral bushing outlet terminal to be communicated with the middle pressure neutral point signal input part of described straight resistance measurement module U2 through described change-over switch module U3 in power transformer;
step 3-2described master controller is notified described straight resistance measurement module U2 output direct current continuous current, described straight resistance measurement module U2 reads in input current value measurement and presses the magnitude of voltage between A phase winding sleeve pipe outlet terminal and middle pressure neutral bushing outlet terminal, according to described magnitude of voltage and current value, described straight resistance measurement module U2 calculates the A middle winding D.C. resistance value of pressing mutually under this tap position, and described DC resistance is transferred to described master controller U1, after measurement finishes, master controller U1 controls and closes experiment power supply, carries out extinguishing arc;
step 3-3described master controller U1 controls described change-over switch module U3 and switches, and the employing method same with step 3-1 and step 3-2 pressed the DC resistance of B phase and C phase winding in measuring respectively;
step 3-4measure after the direct current resistance of middle pressure winding of a tap position, described master controller U1 counts N2 by described measurement tap position and subtracts 1, and judges whether N2-1 equals preset value; If N2-1 is greater than preset value, described master controller U1 controls described motor drive mechanism control module U4, make it control power transformer load tap changer motor drive mechanism and switch next tap position, then adopt the method identical with step 3-1 ~ 3-3 to measure the DC resistance of pressing winding in A, B under this tap, C three-phase; If N2-1 equals preset value, finish the measurement of middle pressure winding D.C. resistance.
The beneficial effect that adopts technique scheme to produce is: the present invention can realize the automatic measurement to DC resistance of power transformer, only needing primary connection and this device of a key operation can automatically complete shunting switch switches, the work of test connection replacing and direct current resistance m easurem ent, realize the whole measuring process automatic switchover of the automatic switchover winding state of load ratio bridging switch tap position by motor drive mechanism controller, in whole test process, change without manually carrying out test apparatus operation and test connection, greatly improve test efficiency, save test period, on-the-spot test shows, use this device to test Transformer Winding direct current resistance can make test efficiency improve more than 80%, this can not only reduce measuring error, can also alleviate working strength, increase work efficiency.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is change-over switch module U3 and three winding power transformer catenation principle figure.
Fig. 3 is double winding DC resistance of power transformer measuring principle figure.
Fig. 4 is double winding power transformer measurement procedure figure.
Fig. 5 is three winding power transformer measurement procedure figure.
In Fig. 1-5, U1 is that master controller, U2 are that directly to hinder measurement module, U3 be that change-over switch module, U4 are that motor drive mechanism controller, U4-1 are that power module, U4-2 are that a liter control module, U4-3 are that to fall control module, U4-4 be that time delay module, T are that three winding power transformers, FJKG are that load ratio bridging switch motor drive mechanism, the T1 of three winding power transformer T is that double winding power transformer, FJKG1 are the load ratio bridging switch motor drive mechanism of double winding power transformer T1.
Embodiment
Embodiment mono-
From the embodiment shown in Fig. 1, Fig. 3, Fig. 4, the present embodiment one comprises master controller U1, directly hinders measurement module U2, change-over switch module U3 and motor drive mechanism controller U4; Described motor drive mechanism controller U4 comprises power module U4-1, rises control module U4-2, falls control module U4-3 and time delay module U4-4;
The winding casing tube outlet terminal of double winding power transformer T1 connects the corresponding port of described straight resistance measurement module U2 through described change-over switch module U3; The two-way connection of corresponding PORT COM of the PORT COM of described straight resistance measurement module U2 and described master controller U1; Described power module U4-1, rise control module U4-2, corresponding PORT COM that the control signal input end that falls control module U4-3, time delay module U4-4 and change-over switch module U3 meets respectively described master controller U1; Described power module U4-1, rise control module U4-2, respective input that the control signal output terminal that falls control module U4-3 and time delay module U4-4 meets respectively the load ratio bridging switch motor drive mechanism FJKG of power transformer T.
Described change-over switch module U3 comprises relay J 1-J25;
The swing arm J1-1 of described relay J 1 meets the high pressure A phase winding sleeve pipe outlet terminal A of power transformer T
h; The stationary contact J1-2 of described relay J 1 meets the high pressure A phase current signal output terminal IAH of described straight resistance measurement module U2;
The stationary contact J1-3 of described relay J 1 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J14-1 of described relay J 14
h; The high pressure A phase voltage signal output terminal VAH of straight resistance measurement module U2 described in another termination of the normally closed contact J14-1 of described relay J 14; The normally opened contact J14-2 of described relay J 14 is unsettled;
The swing arm J2-1 of described relay J 2 meets the high pressure B phase winding sleeve pipe outlet terminal B of power transformer T
h; The stationary contact J2-2 of described relay J 2 meets the high pressure B phase current signal output terminal IBH of described straight resistance measurement module U2;
The stationary contact J2-3 of described relay J 2 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J15-1 of described relay J 15
h; The high pressure B phase voltage signal output terminal VBH of straight resistance measurement module U2 described in another termination of the normally closed contact J15-1 of described relay J 15; The normally opened contact J15-2 of described relay J 15 is unsettled;
The swing arm J3-1 of described relay J 3 meets the high pressure C phase winding sleeve pipe outlet terminal C of power transformer T
h; The stationary contact J3-2 of described relay J 3 meets the high pressure C phase current signal output terminal ICH of described straight resistance measurement module U2;
The stationary contact J3-3 of described relay J 3 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J16-1 of described relay J 16
h; The high pressure C phase voltage signal output terminal VCH of straight resistance measurement module U2 described in another termination of the normally closed contact J16-1 of described relay J 16; The normally opened contact J16-2 of described relay J 16 is unsettled;
The swing arm J4-1 of described relay J 4 meets the high pressure neutral bushing outlet terminal O of power transformer T
h; The stationary contact J4-2 of described relay J 4 meets the high pressure neutral point current signal input part IOH of described straight resistance measurement module U2;
The stationary contact J4-3 of described relay J 4 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J17-1 of described relay J 17
h; The high pressure neutral point voltage signal input part VOH of straight resistance measurement module U2 described in another termination of the normally closed contact J17-1 of described relay J 17; The normally opened contact J17-2 of described relay J 17 is unsettled;
Described relay J 5 ~ J8 and J18 ~ J21 are unsettled;
The swing arm J9-1 of described relay J 9 meets the low pressure A phase winding sleeve pipe outlet terminal A of power transformer T
l; The stationary contact J9-2 of described relay J 9 meets the low pressure A phase current signal output terminal IAL of described straight resistance measurement module U2;
The stationary contact J9-3 of described relay J 9 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J22-1 of described relay J 22
l; The low pressure A phase voltage signal output terminal VAL of straight resistance measurement module U2 described in another termination of the normally closed contact J22-1 of described relay J 22; The normally opened contact J22-2 of described relay J 22 is unsettled;
The swing arm J10-1 of described relay J 10 meets the low pressure B phase winding sleeve pipe outlet terminal B of power transformer T
l; The stationary contact J10-2 of described relay J 10 meets the low pressure B phase current signal output terminal IBL of described straight resistance measurement module U2;
The stationary contact J10-3 of described relay J 10 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J23-1 of described relay J 23
l; The low pressure B phase voltage signal output terminal VBL of straight resistance measurement module U2 described in another termination of the normally closed contact J23-1 of described relay J 23; The normally opened contact J23-2 of described relay J 23 is unsettled;
The swing arm J11-1 of described relay J 11 meets the low pressure C phase winding sleeve pipe outlet terminal C of power transformer T
l; The stationary contact J11-2 of described relay J 11 meets the low pressure C phase current signal output terminal ICL of described straight resistance measurement module U2;
The stationary contact J11-3 of described relay J 11 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J24-1 of described relay J 24
l; The low pressure C phase voltage signal output terminal VCL of straight resistance measurement module U2 described in another termination of the normally closed contact J24-1 of described relay J 24; The normally opened contact J24-2 of described relay J 24 is unsettled;
The swing arm J12-1 of described relay J 12 meets the low pressure neutral bushing outlet terminal O of power transformer T
l; The stationary contact J12-2 of described relay J 12 meets the low pressure neutral point current signal input part IOL of described straight resistance measurement module U2;
The stationary contact J12-3 of described relay J 12 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J25-1 of described relay J 25
l; The low pressure neutral point voltage signal input part VOL of straight resistance measurement module U2 described in another termination of the normally closed contact J25-1 of described relay J 25; The normally opened contact J25-2 of described relay J 25 is unsettled;
The control signal input end of the coil of described relay J 1-J25 connects respectively the corresponding PORT COM of described master controller U1.
The model of described master controller U1 is for grinding auspicious T90; The model of described straight resistance measurement module U2 is dr-m; The model of described relay J 1-J25 is G7L-2A-P; Described power module U4-1 is pow-m; The described control module U4-2 that rises is upctl-m; It is described that to fall control module U4-3 be dnctl-m; Described time delay module U4-4 is tdl-m.
The measuring method of the present embodiment one is as follows: by stationary contact J1-2 ~ J4-2 closure of J1 ~ J4, switch to pressurized state, normally closed contact J14-1 ~ J17 of J14 ~ J17 switches to on-state; J5 ~ J12 switches to vacant state, and J18 ~ J25 switches to vacant state; Measure high pressure winding D.C. resistance by directly hindering 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, measures one time direct current resistance, completes the high pressure winding direct current resistance m easurem ent work under all taps position;
By stationary contact J9-2 ~ J12-2 closure of J9 ~ J12, switch to pressurized state, normally closed contact J22-1 ~ J25-1 of J22 ~ J25 switches to on-state; J1 ~ J9 switches to vacant state, and J17 ~ J21 switches to vacant state; Measure low pressure winding D.C. resistance by directly hindering measurement module.
Embodiment bis-
From the embodiment shown in Fig. 1, Fig. 2, Fig. 5, the present embodiment two comprises master controller U1, directly hinders measurement module U2, change-over switch module U3 and motor drive mechanism controller U4; Described motor drive mechanism controller U4 comprises power module U4-1, rises control module U4-2, falls control module U4-3 and time delay module U4-4; Described change-over switch module U3 comprises relay J 1-J25;
The swing arm J5-1 of described relay J 5 meets the middle pressure A phase winding sleeve pipe outlet terminal A of three winding power transformer T
m; The stationary contact J5-2 of described relay J 5 meets the middle pressure A phase current signal output terminal IAM of described straight resistance measurement module U2;
The stationary contact J5-3 of described relay J 5 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J18-1 of described relay J 18
m; The middle pressure A phase voltage signal output terminal VAM of straight resistance measurement module U2 described in another termination of the normally closed contact J18-1 of described relay J 18; The normally opened contact J18-2 of described relay J 18 is unsettled;
The swing arm J6-1 of described relay J 6 meets the middle pressure B phase winding sleeve pipe outlet terminal B of power transformer T
m; The stationary contact J6-2 of described relay J 6 meets the middle pressure B phase current signal output terminal IBM of described straight resistance measurement module U2;
The stationary contact J6-3 of described relay J 6 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J19-1 of described relay J 19
m; The middle pressure B phase voltage signal output terminal VBM of straight resistance measurement module U2 described in another termination of the normally closed contact J19-1 of described relay J 19; The normally opened contact J19-2 of described relay J 19 is unsettled;
The swing arm J7-1 of described relay J 7 meets the middle pressure C phase winding sleeve pipe outlet terminal C of power transformer T
m; The stationary contact J7-2 of described relay J 7 meets the middle pressure C phase current signal output terminal ICM of described straight resistance measurement module U2;
The stationary contact J7-3 of described relay J 7 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J20-1 of described relay J 20
m; The middle pressure C phase voltage signal output terminal VCM of straight resistance measurement module U2 described in another termination of the normally closed contact J20-1 of described relay J 20; The normally opened contact J20-2 of described relay J 20 is unsettled;
The swing arm J8-1 of described relay J 8 meets the middle pressure neutral bushing outlet terminal O of power transformer T
m; The stationary contact J8-2 of described relay J 8 meets the middle pressure neutral point current signal input part IOM of described straight resistance measurement module U2;
The stationary contact J8-3 of described relay J 8 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J21-1 of described relay J 21
m; The middle pressure neutral point voltage signal input part VOM of straight resistance measurement module U2 described in another termination of the normally closed contact J21-1 of described relay J 21; The normally opened contact J21-2 of described relay J 21 is unsettled;
Other structures of the present embodiment two are identical with described embodiment mono-.
The present embodiment two measuring method as follows: by stationary contact J1-2 ~ J4-2 closure of J1 ~ J4, switch to pressurized state, normally closed contact J14-1 ~ J17 of J14 ~ J17 switches to on-state; J5 ~ J12 switches to vacant state, and J18 ~ J25 switches to vacant state; Measure high pressure winding D.C. resistance by directly hindering 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, measures one time direct current resistance, completes the high pressure winding direct current resistance m easurem ent work under all taps position;
By stationary contact J5-2 ~ J8-2 closure of J5 ~ J8, switch to pressurized state, normally closed contact J18-1 ~ J21-1 of J18 ~ J21 switches to on-state; J1 ~ J4 and J9 ~ J12 switch to vacant state, and J14 ~ J17 and J22 ~ J25 switch to vacant state; Press winding D.C. resistance by directly hindering in 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, measures one time direct current resistance, completes the middle pressure winding D.C. resistance surveying work under all taps position;
By stationary contact J9-2 ~ J12-2 closure of J9 ~ J12, switch to pressurized state, normally closed contact J22-1 ~ J25-1 of J22 ~ J25 switches to on-state; J1 ~ J9 switches to vacant state, and J17 ~ J21 switches to vacant state; Measure low pressure winding D.C. resistance by directly hindering measurement module.
Claims (4)
1. a device of automatically measuring power transformer winding D. C. resistance, is characterized in that: comprise master controller U1, directly hinder measurement module U2, change-over switch module U3 and motor drive mechanism controller U4; Described motor drive mechanism controller U4 comprises power module U4-1, rises control module U4-2, falls control module U4-3 and time delay module U4-4;
The winding casing tube outlet terminal of power transformer T connects the corresponding port of described straight resistance measurement module U2 through meeting described change-over switch module U3; The two-way connection of corresponding PORT COM of the PORT COM of described straight resistance measurement module U2 and described master controller U1; Described power module U4-1, rise control module U4-2, corresponding PORT COM that the control signal input end that falls control module U4-3, time delay module U4-4 and change-over switch module U3 meets respectively described master controller U1; Described power module U4-1, rise control module U4-2, respective input that the control signal output terminal that falls control module U4-3 and time delay module U4-4 meets respectively the load ratio bridging switch motor drive mechanism FJKG of power transformer T.
2. the device of a kind of automatic measurement power transformer winding D. C. resistance according to claim 1, is characterized in that: described change-over switch module U3 comprises relay J 1-J25;
The swing arm J1-1 of described relay J 1 meets the high pressure A phase winding sleeve pipe outlet terminal A of power transformer T
h; The stationary contact J1-2 of described relay J 1 meets the high pressure A phase current signal output terminal IAH of described straight resistance measurement module U2;
The stationary contact J1-3 of described relay J 1 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J14-1 of described relay J 14
h; The high pressure A phase voltage signal output terminal VAH of straight resistance measurement module U2 described in another termination of the normally closed contact J14-1 of described relay J 14; The normally opened contact J14-2 of described relay J 14 is unsettled;
The swing arm J2-1 of described relay J 2 meets the high pressure B phase winding sleeve pipe outlet terminal B of power transformer T
h; The stationary contact J2-2 of described relay J 2 meets the high pressure B phase current signal output terminal IBH of described straight resistance measurement module U2;
The stationary contact J2-3 of described relay J 2 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J15-1 of described relay J 15
h; The high pressure B phase voltage signal output terminal VBH of straight resistance measurement module U2 described in another termination of the normally closed contact J15-1 of described relay J 15; The normally opened contact J15-2 of described relay J 15 is unsettled;
The swing arm J3-1 of described relay J 3 meets the high pressure C phase winding sleeve pipe outlet terminal C of power transformer T
h; The stationary contact J3-2 of described relay J 3 meets the high pressure C phase current signal output terminal ICH of described straight resistance measurement module U2;
The stationary contact J3-3 of described relay J 3 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J16-1 of described relay J 16
h; The high pressure C phase voltage signal output terminal VCH of straight resistance measurement module U2 described in another termination of the normally closed contact J16-1 of described relay J 16; The normally opened contact J16-2 of described relay J 16 is unsettled;
The swing arm J4-1 of described relay J 4 meets the high pressure neutral bushing outlet terminal O of power transformer T
h; The stationary contact J4-2 of described relay J 4 meets the high pressure neutral point current signal input part IOH of described straight resistance measurement module U2;
The stationary contact J4-3 of described relay J 4 is through the contact of described relay J 13 J13-1 ground connection;
The high pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J17-1 of described relay J 17
h; The high pressure neutral point voltage signal input part VOH of straight resistance measurement module U2 described in another termination of the normally closed contact J17-1 of described relay J 17; The normally opened contact J17-2 of described relay J 17 is unsettled;
The swing arm J5-1 of described relay J 5 meets the middle pressure A phase winding sleeve pipe outlet terminal A of power transformer T
m; The stationary contact J5-2 of described relay J 5 meets the middle pressure A phase current signal output terminal IAM of described straight resistance measurement module U2;
The stationary contact J5-3 of described relay J 5 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J18-1 of described relay J 18
m; The middle pressure A phase voltage signal output terminal VAM of straight resistance measurement module U2 described in another termination of the normally closed contact J18-1 of described relay J 18; The normally opened contact J18-2 of described relay J 18 is unsettled;
The swing arm J6-1 of described relay J 6 meets the middle pressure B phase winding sleeve pipe outlet terminal B of power transformer T
m; The stationary contact J6-2 of described relay J 6 meets the middle pressure B phase current signal output terminal IBM of described straight resistance measurement module U2;
The stationary contact J6-3 of described relay J 6 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J19-1 of described relay J 19
m; The middle pressure B phase voltage signal output terminal VBM of straight resistance measurement module U2 described in another termination of the normally closed contact J19-1 of described relay J 19; The normally opened contact J19-2 of described relay J 19 is unsettled;
The swing arm J7-1 of described relay J 7 meets the middle pressure C phase winding sleeve pipe outlet terminal C of power transformer T
m; The stationary contact J7-2 of described relay J 7 meets the middle pressure C phase current signal output terminal ICM of described straight resistance measurement module U2;
The stationary contact J7-3 of described relay J 7 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J20-1 of described relay J 20
m; The middle pressure C phase voltage signal output terminal VCM of straight resistance measurement module U2 described in another termination of the normally closed contact J20-1 of described relay J 20; The normally opened contact J20-2 of described relay J 20 is unsettled;
The swing arm J8-1 of described relay J 8 meets the middle pressure neutral bushing outlet terminal O of power transformer T
m; The stationary contact J8-2 of described relay J 8 meets the middle pressure neutral point current signal input part IOM of described straight resistance measurement module U2;
The stationary contact J8-3 of described relay J 8 is through the contact of described relay J 13 J13-1 ground connection;
The middle pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J21-1 of described relay J 21
m; The middle pressure neutral point voltage signal input part VOM of straight resistance measurement module U2 described in another termination of the normally closed contact J21-1 of described relay J 21; The normally opened contact J21-2 of described relay J 21 is unsettled;
The swing arm J9-1 of described relay J 9 meets the low pressure A phase winding sleeve pipe outlet terminal A of power transformer T
l; The stationary contact J9-2 of described relay J 9 meets the low pressure A phase current signal output terminal IAL of described straight resistance measurement module U2;
The stationary contact J9-3 of described relay J 9 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure A phase winding sleeve pipe outlet terminal A of a termination power transformer T of the normally closed contact J22-1 of described relay J 22
l; The low pressure A phase voltage signal output terminal VAL of straight resistance measurement module U2 described in another termination of the normally closed contact J22-1 of described relay J 22; The normally opened contact J22-2 of described relay J 22 is unsettled;
The swing arm J10-1 of described relay J 10 meets the low pressure B phase winding sleeve pipe outlet terminal B of power transformer T
l; The stationary contact J10-2 of described relay J 10 meets the low pressure B phase current signal output terminal IBL of described straight resistance measurement module U2;
The stationary contact J10-3 of described relay J 10 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure B phase winding sleeve pipe outlet terminal B of a termination power transformer T of the normally closed contact J23-1 of described relay J 23
l; The low pressure B phase voltage signal output terminal VBL of straight resistance measurement module U2 described in another termination of the normally closed contact J23-1 of described relay J 23; The normally opened contact J23-2 of described relay J 23 is unsettled;
The swing arm J11-1 of described relay J 11 meets the low pressure C phase winding sleeve pipe outlet terminal C of power transformer T
l; The stationary contact J11-2 of described relay J 11 meets the low pressure C phase current signal output terminal ICL of described straight resistance measurement module U2;
The stationary contact J11-3 of described relay J 11 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure C phase winding sleeve pipe outlet terminal C of a termination power transformer T of the normally closed contact J24-1 of described relay J 24
l; The low pressure C phase voltage signal output terminal VCL of straight resistance measurement module U2 described in another termination of the normally closed contact J24-1 of described relay J 24; The normally opened contact J24-2 of described relay J 24 is unsettled;
The swing arm J12-1 of described relay J 12 meets the low pressure neutral bushing outlet terminal O of power transformer T
l; The stationary contact J12-2 of described relay J 12 meets the low pressure neutral point current signal input part IOL of described straight resistance measurement module U2;
The stationary contact J12-3 of described relay J 12 is through the contact of described relay J 13 J13-1 ground connection;
The low pressure neutral bushing outlet terminal O of a termination power transformer T of the normally closed contact J25-1 of described relay J 25
l; The low pressure neutral point voltage signal input part VOL of straight resistance measurement module U2 described in another termination of the normally closed contact J25-1 of described relay J 25; The normally opened contact J25-2 of described relay J 25 is unsettled;
The control signal input end of the coil of described relay J 1-J25 connects respectively the corresponding PORT COM of described master controller U1.
3. the device of a kind of automatic measurement power transformer winding D. C. resistance according to claim 2, is characterized in that: the model of described master controller U1 is for grinding auspicious T90; The model of described straight resistance measurement module U2 is dr-m; The model of described relay J 1-J25 is G7L-2A-P; Described power module U4-1 is pow-m; The described control module U4-2 that rises is upctl-m; It is described that to fall control module U4-3 be dnctl-m; Described time delay module U4-4 is tdl-m.
4. the measuring method of the device of a kind of automatic measurement power transformer winding D. C. resistance according to claim 3, is characterized in that comprising the steps:
step 1obtaining the maximum tap position of the type of tested power transformer, the specified tap of tested tapping switch for electric power transformer position, tested tapping switch for electric power transformer and minimum tap position, preset high-pressure by described master controller U1 measures tap position and counts N1 and middle pressure and measure tap position and count N2; If double winding power transformer goes to step 2; If three winding power transformers go to step 3;
step 2double winding Winding in Power Transformer directly hinders measurement;
(1) step of measurement high pressure winding D.C. resistance;
step 2-1described master controller U1 controls described change-over switch module U3 and switches, and power transformer high pressure A phase winding sleeve pipe outlet terminal is communicated with the high pressure A phase signals output terminal of described straight resistance measurement module U2 through described change-over switch module U3; Power transformer high pressure A phase neutral bushing outlet terminal is communicated with the high pressure neutral point signal input part of described straight resistance measurement module U2 through described change-over switch module U3;
step 2-2described master controller is notified described straight resistance measurement module U2 output direct current continuous current, described straight resistance measurement module U2 read input current value and measure high pressure A phase winding sleeve pipe outlet terminal and high pressure neutral bushing outlet terminal between magnitude of voltage, according to described magnitude of voltage and current value, described straight resistance measurement module U2 calculates the A phase high pressure winding DC resistance under this tap position, and described DC resistance is transferred to described master controller U1, show or print, after measurement finishes, master controller U1 controls and closes experiment power supply, carries out extinguishing arc;
step 2-3described master controller U1 controls described change-over switch module U3 and switches, and adopts the method same with step 2-1 and step 2-2 to measure respectively the DC resistance of high pressure B phase and C phase winding;
step 2-4measure after the direct current resistance of high pressure winding of a tap position, described master controller U1 counts N1 by described measurement tap position and subtracts 1, and judges whether N1-1 equals preset value; If N1-1 is greater than preset value, described master controller U1 controls described motor drive mechanism control module U4, make it control power transformer load tap changer motor drive mechanism and switch next tap position, then adopt the method identical with step 2-1 ~ 2-3 to measure the DC resistance of A, B under this tap, C three-phase high-voltage winding; If N1-1 equals preset value, finish the measurement of high pressure winding D.C. resistance;
(2) step of measurement low pressure winding D.C. resistance;
step 2-5described master controller U1 controls described change-over switch module U3, and power transformer low pressure A phase winding sleeve pipe outlet terminal is communicated with the low pressure A phase signals output terminal of described straight resistance measurement module U2 through described change-over switch module U3; Power transformer low pressure A phase neutral bushing outlet terminal is communicated with the low pressure neutral point signal input part of described straight resistance measurement module U2 through described change-over switch module U3;
step 2-6described master controller U1 controls described straight resistance measurement module U2 output direct current continuous current, described straight resistance measurement module U2 read input current value and measure low pressure A phase winding sleeve pipe outlet terminal and low pressure neutral bushing outlet terminal between magnitude of voltage, described straight resistance measurement module U2 calculates A phase low pressure winding D.C. resistance value, and described DC resistance is transferred to described master controller U1; After measurement finishes, described master controller U1 controls and closes experiment power supply, carries out extinguishing arc;
step 2-7described master controller U1 controls described change-over switch module, adopts the method same with step 2-5 and step 2-6 to measure respectively the DC resistance of low pressure B phase and C phase winding;
step 3three winding power transformer windings directly hinder measurement;
The step of high pressure winding D.C. resistance of measuring three winding power transformers is identical with described step 2-1～step 2-4; The step of low pressure winding D.C. resistance of measuring three winding power transformers is identical with described step 2-5～step 2-7;
The step of middle pressure winding D.C. resistance of measuring three winding power transformers is as follows:
step 3-1described master controller U1 controls described change-over switch module U3 and switches, and makes to press A phase winding sleeve pipe outlet terminal to be communicated with the middle pressure A phase signals output terminal of described straight resistance measurement module U2 through described change-over switch module U3 in power transformer; Make to press A phase neutral bushing outlet terminal to be communicated with the middle pressure neutral point signal input part of described straight resistance measurement module U2 through described change-over switch module U3 in power transformer;
step 3-2described master controller is notified described straight resistance measurement module U2 output direct current continuous current, described straight resistance measurement module U2 reads in input current value measurement and presses the magnitude of voltage between A phase winding sleeve pipe outlet terminal and middle pressure neutral bushing outlet terminal, according to described magnitude of voltage and current value, described straight resistance measurement module U2 calculates the A middle winding D.C. resistance value of pressing mutually under this tap position, and described DC resistance is transferred to described master controller U1, after measurement finishes, master controller U1 controls and closes experiment power supply, carries out extinguishing arc;
step 3-3described master controller U1 controls described change-over switch module U3 and switches, and the employing method same with step 3-1 and step 3-2 pressed the DC resistance of B phase and C phase winding in measuring respectively;
step 3-4measure after the direct current resistance of middle pressure winding of a tap position, described master controller U1 counts N2 by described measurement tap position and subtracts 1, and judges whether N2-1 equals preset value; If N2-1 is greater than preset value, described master controller U1 controls described motor drive mechanism control module U4, make it control power transformer load tap changer motor drive mechanism and switch next tap position, then adopt the method identical with step 3-1 ~ 3-3 to measure the DC resistance of pressing winding in A, B under this tap, C three-phase; If N2-1 equals preset value, finish the measurement of middle pressure winding D.C. resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410068626.6A CN103884915A (en) | 2014-02-27 | 2014-02-27 | Device and method for automatically measuring direct-current resistance of windings of power transformers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410068626.6A CN103884915A (en) | 2014-02-27 | 2014-02-27 | Device and method for automatically measuring direct-current resistance of windings of power transformers |
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| CN103884915A true CN103884915A (en) | 2014-06-25 |
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| CN105334456A (en) * | 2015-11-06 | 2016-02-17 | 国家电网公司 | Dual voltage-regulating winding power transformer on-load tap-changer tester and fault detection method |
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| CN107561418A (en) * | 2017-08-15 | 2018-01-09 | 华北电力大学 | A kind of dielectric response live line measurement device of power transformer, bushing installation |
| CN109358235A (en) * | 2018-11-29 | 2019-02-19 | 山东电工电气集团智能电气有限公司 | Transformer directly hinders measuring device and system |
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