CN103941100A - Intelligent device for measuring dielectric loss factor and insulation resistance of power transformer - Google Patents
Intelligent device for measuring dielectric loss factor and insulation resistance of power transformer Download PDFInfo
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- CN103941100A CN103941100A CN201410071488.7A CN201410071488A CN103941100A CN 103941100 A CN103941100 A CN 103941100A CN 201410071488 A CN201410071488 A CN 201410071488A CN 103941100 A CN103941100 A CN 103941100A
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Abstract
The invention relates to an intelligent device for measuring the dielectric loss factor and the insulation resistance of a power transformer. The intelligent device comprises an upper computer U1, an insulation resistance measuring module U2, a dielectric loss measuring reverse connection module U3, a dielectric loss measuring positive connection module set, a diverter switch J, a high-voltage relay set and a low-voltage relay set. The intelligent device has the following advantages that as long as connection lines are well connected at the beginning of a test, in the whole test process, the upper computer is used for controlling high-voltage relays, low-voltage relays and the diverter switch to select a winding state and a measurement project so as to replace manual line connecting, the winding state is automatically switched in the whole measurement process, manual intervention is not needed, measurement errors can be reduced, the working intensity can also be relieved, the working efficiency is improved, and intelligent measurement of the dielectric loss factor and the insulation resistance of the power transformer is achieved.
Description
Technical field
The invention belongs to power equipment field of measuring technique, relate to a kind of Intelligent electric power transformer dielectric dissipation factor and insulation resistance measuring device.
Background technology
Power transformer is the major equipment of electric system, significant for power grid security operation reliably, and power transformer being carried out to the tests such as state of insulation is the important measures that ensure its safe operation.Test practice shows, measuring the dielectric dissipation factor of power transformer and the measurement of insulation resistance is the effective means that judges electric power transformer insulated state, is that power transformer joins and the main project of preventive trial.Dielectric dissipation factor is mainly used to check that the state of transformer makes moist, adhere to greasy filth and serious local defect etc. on oil quality deterioration, winding; Insulation resistance can judge that transformer insulated entirety is made moist, parts surface makes moist or dirty and perfoliate concentrated defect effectively.
Because of the direct ground connection of shell of power transformer, field by using alternating current bridge opposition method is measured the medium consumption factor of power transformer at present, when test, need will measure the each phase short circuit pressurization of winding, the each phase short circuit of non-measurement winding ground connection.According to the requirement of the industry standard DL/T474.3 – of State Grid 2006 " directive/guide dielectric dissipation factor tan δ test is implemented in on-the-spot Insulation Test ", surveying heaped capacity three-winding transformer need to implement in accordance with the following steps: the pressurization of (1) low pressure winding short circuit, high pressure, middle pressure winding short circuit ground connection; (2) in, press the pressurization of winding short circuit, high pressure, low pressure winding short circuit ground connection; (3) high pressure winding short circuit pressurization, middle pressure, low pressure winding short circuit ground connection; (4) high pressure, the pressurization of middle pressure winding short circuit, low pressure winding short circuit ground connection; (5) high pressure, middle pressure and the pressurization of low pressure winding short circuit; Measure while being contained in the dielectric dissipation factor of arbitrary bushing on three-phase transformer and electric capacity simultaneously, three phase windings of identical electric pressure and neutral point must pressurize by short circuit, by other winding three-phase short circuit ground connection of non-measurement, adopt positive connection, to sleeve pipe measuring one by one.As mentioned above, if intactly measure the bushing on a large-scale power transformer and transformer, just likely need dismounting connecting line 17 times, due to high-power transformer bulky (up to 4m), adopt manual type to disconnect line and not only waste time and energy, but also very likely mis-wired cause the even hidden danger in safety of error in measurement.
At present when measuring transformer insulation resistance, be in like manner also to measure successively the insulating resistance value of each winding over the ground and between other windings.The each lead end short circuit pressurization of tested winding, all short circuit ground connection of all the other each non-tested windings.Different from measuring transformer dielectric dissipation factor, for avoiding residual charge on winding to cause measuring error bigger than normal, should be by tested winding short circuit ground connection before measurement, should be no less than 2 minutes its discharge time.Be not difficult to find out, measuring transformer insulation resistance also needs repeatedly to disconnect line, also exists the hidden danger in measuring error and the safety causing thus.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of Intelligent electric power transformer dielectric dissipation factor and insulation resistance measuring device without disconnect line in measuring process.
The technical solution adopted for the present invention to solve the technical problems is: a kind of Intelligent electric power transformer dielectric dissipation factor and insulation resistance measuring device, comprise host computer U1, insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement, change-over switch J, high-voltage relay group and low-voltage relay group;
Three phase windings after the identical voltage one side short circuit of power transformer connect respectively the corresponding port of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 successively through described high-voltage relay group, change-over switch J; The extension line of Winding in Power Transformer bottom shielding of bushing connects the corresponding port of the positive connection module group of described dielectric loss measurement through described low-voltage relay group; The power end of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 meets high-voltage ac power ACY through high-voltage power supply interface ACT respectively; The PORT COM of described insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM; The coil of described high-voltage relay group, change-over switch J, low-voltage relay group connects respectively the corresponding PORT COM of described host computer U1.
Described low-voltage relay group comprises low-voltage relay J1-J12; Described high-voltage relay group comprises high-voltage relay J13-J15; The positive connection module group of described dielectric loss measurement comprises the positive connection module U15 of the positive connection module of the 4th dielectric loss measurement U4 to the 15 dielectric loss measurement;
The swing arm end J13-1 of described high-voltage relay J13 connects three phase windings after three winding power transformer T1 high pressure one side short circuits; The normally opened contact J13-3 ground connection of described high-voltage relay J13;
The swing arm end J14-1 of described high-voltage relay J14 connects and in three winding power transformer T1, presses three phase windings after a side short circuit; The normally opened contact J14-3 ground connection of described high-voltage relay J14;
The swing arm end J15-1 of described high-voltage relay J15 connects three phase windings after three winding power transformer T1 low pressure one side short circuits; The normally opened contact J15-3 ground connection of described high-voltage relay J15;
The normally closed contact J15-2 of the normally closed contact J13-2 of described high-voltage relay J13, the normally closed contact J14-2 of high-voltage relay J14 and described high-voltage relay J15 meets respectively the swing arm end J-1 of described change-over switch J;
The normally closed contact J-2 of described change-over switch J connects the corresponding port of described insulation measurement module U2; The normally opened contact J-3 of described change-over switch J connects the corresponding port of described dielectric loss measurement reversal connection module U3;
Swing arm end J1-1～J12-1 of described low-voltage relay J1-J12 meets respectively the extension line X1-X12 of three winding power transformer T1 winding bushing tap BT1; Normally closed contact J1-2～J12-2 of described low-voltage relay J1-J12 connects respectively the corresponding port of the positive connection module U15 of the positive connection module of described the 1st dielectric loss measurement U4 to the 12 dielectric loss measurement; Normally opened contact J1-3～J12-3 of described low-voltage relay J1-J12 ground connection respectively;
The PORT COM of the positive connection module U15 of the positive connection module of described the 4th dielectric loss measurement U4 to the 15 dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM;
The coil of described low-voltage relay J1-J12 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described high-voltage relay J13-J15 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described change-over switch J connects respectively the corresponding PORT COM of described host computer U1.
Described low-voltage relay group comprises low-voltage relay J16-J23; Described high-voltage relay group comprises high-voltage relay J24-J25; The positive connection module group of described dielectric loss measurement comprises the positive connection module U23 of the positive connection module of the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement;
The swing arm end J24-1 of described high-voltage relay J24 connects three phase windings after double winding power transformer T2 high pressure one side short circuit; The normally opened contact J24-3 ground connection of described high-voltage relay J24;
The swing arm end J25-1 of described high-voltage relay J25 connects three phase windings after double winding power transformer T2 low pressure one side short circuit; The normally opened contact J15-3 ground connection of described high-voltage relay J25;
The normally closed contact J24-2 of described high-voltage relay J24 and the normally closed contact J25-2 of high-voltage relay J25 meet respectively the swing arm end J-1 of described change-over switch J;
The normally closed contact J-2 of described change-over switch J connects the corresponding port of described insulation measurement module U2; The normally opened contact J-3 of described change-over switch J connects the corresponding port of described dielectric loss measurement reversal connection module U3;
Swing arm end J16-1～J23-1 of described low-voltage relay J16-J23 meets respectively the extension line X21-X28 of double winding power transformer T2 winding bushing tap BT2; Normally closed contact J16-2～J23-2 of described low-voltage relay J16-J23 connects respectively the corresponding port of the positive connection module U23 of the positive connection module of described the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement; Normally opened contact J16-3～J23-3 of described low-voltage relay J16-J23 ground connection respectively;
The PORT COM of the positive connection module U23 of the positive connection module of described the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM;
The coil of described low-voltage relay J16-J23 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described high-voltage relay J24-J25 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described change-over switch J connects respectively the corresponding PORT COM of described host computer U1.
The model of described host computer U1 is for grinding auspicious T90; The model of described insulation measurement module U2 is TOP415; The model of described dielectric loss measurement reversal connection module U3 is TOP413; The model of the positive connection module U23 of the positive connection module of described the 4th dielectric loss measurement U4 to the 23 dielectric loss measurement is TOP414; The model of described change-over switch J is G6H; The model of described high-voltage relay J13-J15 and high-voltage relay J24-J25 is GL66SF; The model of described low-voltage relay J1-J12 and low-voltage relay J16-J23 is G7L-2A-P.
Beneficial effect of the present invention is as follows: the present invention is without disconnect line in measuring process, as long as connect line in the time starting to test, just can automatically measure the each winding of transformer dielectric dissipation factor, the dielectric dissipation factor of the each winding casing tube of transformer and the insulation resistance of transformer over the ground, pilot process is without disconnecting line; In the present invention, each module can be by PORT COM and upper machine communication, and test figure is uploaded to host computer; Thereby select winding state and measure the item to replace artificial wiring by PC control high-voltage relay, low-voltage relay and change-over switch in whole process of the test, whole measuring process automatic switchover winding state, without manual intervention, can not only reduce measuring error, can also alleviate working strength, increase work efficiency, realize the intellectualityization of power transformer dielectric dissipation factor and insulation resistance is measured.
Brief description of the drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the schematic diagram of measuring three winding power transformers;
Fig. 3 is the schematic diagram of measuring double winding power transformer.
Embodiment
Embodiment 1
From the embodiment shown in Fig. 1-2, the present embodiment comprises host computer U1, insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement, change-over switch J, high-voltage relay group and low-voltage relay group;
Three phase windings after the identical voltage one side short circuit of power transformer connect respectively the corresponding port of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 successively through described high-voltage relay group, change-over switch J; The extension line of Winding in Power Transformer bottom shielding of bushing connects the corresponding port of the positive connection module group of described dielectric loss measurement through described low-voltage relay group; The power end of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 meets high-voltage ac power ACY through high-voltage power supply interface ACT respectively; The PORT COM of described insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM; The coil of described high-voltage relay group, change-over switch J, low-voltage relay group connects respectively the corresponding PORT COM of described host computer U1.
Described low-voltage relay group comprises low-voltage relay J1-J12; Described high-voltage relay group comprises high-voltage relay J13-J15; The positive connection module group of described dielectric loss measurement comprises the positive connection module U15 of the positive connection module of the 4th dielectric loss measurement U4 to the 15 dielectric loss measurement;
The swing arm end J13-1 of described high-voltage relay J13 connects three phase windings after three winding power transformer T1 high pressure one side short circuits; The normally opened contact J13-3 ground connection of described high-voltage relay J13;
The swing arm end J14-1 of described high-voltage relay J14 connects and in three winding power transformer T1, presses three phase windings after a side short circuit; The normally opened contact J14-3 ground connection of described high-voltage relay J14;
The swing arm end J15-1 of described high-voltage relay J15 connects three phase windings after three winding power transformer T1 low pressure one side short circuits; The normally opened contact J15-3 ground connection of described high-voltage relay J15;
The normally closed contact J15-2 of the normally closed contact J13-2 of described high-voltage relay J13, the normally closed contact J14-2 of high-voltage relay J14 and described high-voltage relay J15 meets respectively the swing arm end J-1 of described change-over switch J;
The normally closed contact J-2 of described change-over switch J connects the corresponding port of described insulation measurement module U2; The normally opened contact J-3 of described change-over switch J connects the corresponding port of described dielectric loss measurement reversal connection module U3;
Swing arm end J1-1～J12-1 of described low-voltage relay J1-J12 meets respectively the extension line X1-X12 of three winding power transformer T1 winding bushing tap BT1; Normally closed contact J1-2～J12-2 of described low-voltage relay J1-J12 connects respectively the corresponding port of the positive connection module U15 of the positive connection module of described the 1st dielectric loss measurement U4 to the 12 dielectric loss measurement; Normally opened contact J1-3～J12-3 of described low-voltage relay J1-J12 ground connection respectively;
The PORT COM of the positive connection module U15 of the positive connection module of described the 4th dielectric loss measurement U4 to the 15 dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM;
The coil of described low-voltage relay J1-J12 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described high-voltage relay J13-J15 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described change-over switch J connects respectively the corresponding PORT COM of described host computer U1.The model of described host computer U1 is for grinding auspicious T90; The model of described insulation measurement module U2 is TOP415; The model of described dielectric loss measurement reversal connection module U3 is TOP413; The model of the positive connection module U15 of the positive connection module of described the 4th dielectric loss measurement U4 to the 15 dielectric loss measurement is TOP414; The model of described change-over switch J is G6H; The model of described high-voltage relay J13-J15 is GL66SF; The model of described low-voltage relay J1-J12 is G7L-2A-P.
The course of work of the present embodiment is as follows:
High-voltage relay is used for the state of control transformer winding in measuring process: pressurization or ground connection; Change-over switch is used for selecting transformer measure the item: dielectric dissipation factor or insulation resistance; Dielectric loss measurement reversal connection module is used for the dielectric dissipation factor of measuring transformer; The positive connection module of dielectric loss measurement is used for the dielectric dissipation factor of measuring transformer winding casing tube, and it can just connect measurement module with dielectric loss and measure simultaneously; Insulation measurement module is used for the insulation resistance of measuring transformer.
To after the winding short circuit of transformer the same side, be connected with corresponding high-voltage relay, high-voltage relay number is corresponding with Transformer Winding group number, according to the requirement of the industry standard DL/T474.3 – of State Grid 2006 " directive/guide dielectric dissipation factor tan δ test is implemented in on-the-spot Insulation Test " and " power equipment hand-over and preventive test code ", switch the high-voltage relay of corresponding windings, the high-voltage relay that tested winding is corresponding switches to high pressure, high-voltage relay corresponding to non-tested winding switches to be held, and change-over switch is selected corresponding test module.
1. measuring transformer dielectric dissipation factor
(1) change-over switch J is switched to measuring media loss factor state, high voltage interface input AC high pressure;
(2) high-voltage relay J15 normally closed contact is connected, high-voltage relay J13 and high-voltage relay J14 normally opened contact closure, switch to earth terminal, low-voltage relay J1～J12 switches to and holds, and dielectric loss reversal connection measurement module is measured low-pressure side winding with the dielectric loss value between middle pressure, high pressure and transformer case;
(3) low-voltage relay J9～J12 normally closed contact is connected, and switches to measuring junction, and dielectric loss is just connecing the dielectric loss value of measurement module measurement low-pressure side winding casing tube;
(4) high-voltage relay J14 normally closed contact is connected, high-voltage relay J13 and high-voltage relay J15 normally opened contact closure, switch to and hold, low-voltage relay J1～J12 switches to and holds, and dielectric loss reversal connection measurement module is measured medium voltage side winding with the dielectric loss value between low pressure, high pressure and transformer case;
(5) low-voltage relay J5～J8 normally closed contact is connected, and switches to measuring junction, and dielectric loss is just connecing the dielectric loss value of measurement module measurement medium voltage side winding casing tube;
(6) high-voltage relay J13 normally closed contact is connected, high-voltage relay J14 and high-voltage relay J15 switch to and hold, low-voltage relay J1～J12 switches to and holds, and dielectric loss reversal connection measurement module is measured high-pressure side winding with the dielectric loss value between middle pressure, low pressure and transformer case;
(7) low-voltage relay J1～J4 normally closed contact is connected, and switches to measuring junction, and dielectric loss is just connecing the dielectric loss value of measurement module measurement high-pressure side winding casing tube;
(8) high-voltage relay J13 and high-voltage relay J14 normally closed contact are connected, high-voltage relay J15 switches to and holds, low-voltage relay J1～J12 switches to and holds, and dielectric loss reversal connection measurement module is measured high pressure, medium voltage side winding with the dielectric loss value between low pressure and transformer case;
(9) high-voltage relay J13, high-voltage relay J14 and high-voltage relay J15 normally closed contact are connected, low-voltage relay J1～J12 switches to and holds, and dielectric loss reversal connection measurement module is measured high pressure, middle pressure and low-pressure side winding with the dielectric loss value between transformer case.
2. measuring transformer insulating resistance value
(1) change-over switch J is switched to and measures insulation resistance state, and low-voltage relay J1～J12 switches to and holds, high voltage interface input AC high pressure;
(2) high-voltage relay J13, high-voltage relay J14, high-voltage relay J15 are switched to and hold, and continue to discharge over the ground two minutes;
(3) high-voltage relay J15 normally closed contact is connected, and switches to high pressure, and high-voltage relay J13 and high-voltage relay J14 switch to and hold, and insulation measurement module is measured low-pressure side winding with the insulating resistance value between middle pressure, high pressure and transformer case;
(4) high-voltage relay J14 normally closed contact is connected, and switches to high pressure, and high-voltage relay J13 and high-voltage relay J15 switch to and hold, and insulation measurement module is measured medium voltage side winding with the insulating resistance value between low pressure, high pressure and transformer case;
(5) high-voltage relay J13 normally closed contact is connected, and switches to high pressure, and high-voltage relay J14 and high-voltage relay J15 switch to and hold, and insulation measurement module is measured high-pressure side winding with the insulating resistance value between middle pressure, low pressure and transformer case;
(6) high-voltage relay J13 and high-voltage relay J14 normally closed contact are connected, and switch to high pressure, and high-voltage relay J15 switches to and holds, and insulation resistance module is measured high pressure, medium voltage side winding with the insulating resistance value between low pressure and transformer case;
(7) high-voltage relay J13, high-voltage relay J14 and high-voltage relay J15 switch to high pressure, and insulation measurement module is measured high pressure, middle pressure and low-pressure side winding with the insulating resistance value between transformer case.
Embodiment 2
From the embodiment shown in Fig. 1, Fig. 3, the present embodiment comprises host computer U1, insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement, change-over switch J, high-voltage relay group, low-voltage relay group and high-voltage power supply interface ACT;
Three phase windings after the identical voltage one side short circuit of power transformer connect respectively the corresponding port of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 successively through described high-voltage relay group, change-over switch J; The extension line of Winding in Power Transformer bottom shielding of bushing connects the corresponding port of the positive connection module group of described dielectric loss measurement through described low-voltage relay group; The power end of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 meets high-voltage ac power ACY through described high-voltage power supply interface ACT respectively; The PORT COM of described insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM; The coil of described high-voltage relay group, change-over switch J, low-voltage relay group connects respectively the corresponding PORT COM of described host computer U1.
Described low-voltage relay group comprises low-voltage relay J16-J23; Described high-voltage relay group comprises high-voltage relay J24-J25; The positive connection module group of described dielectric loss measurement comprises the positive connection module U23 of the positive connection module of the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement;
The swing arm end J24-1 of described high-voltage relay J24 connects three phase windings after double winding power transformer T2 high pressure one side short circuit; The normally opened contact J24-3 ground connection of described high-voltage relay J24;
The swing arm end J25-1 of described high-voltage relay J25 connects three phase windings after double winding power transformer T2 low pressure one side short circuit; The normally opened contact J15-3 ground connection of described high-voltage relay J25;
The normally closed contact J24-2 of described high-voltage relay J24 and the normally closed contact J25-2 of high-voltage relay J25 meet respectively the swing arm end J-1 of described change-over switch J;
The normally closed contact J-2 of described change-over switch J connects the corresponding port of described insulation measurement module U2; The normally opened contact J-3 of described change-over switch J connects the corresponding port of described dielectric loss measurement reversal connection module U3;
Swing arm end J16-1～J23-1 of described low-voltage relay J16-J23 meets respectively the extension line X21-X28 of double winding power transformer T2 winding bushing tap BT2; Normally closed contact J16-2～J23-2 of described low-voltage relay J16-J23 connects respectively the corresponding port of the positive connection module U23 of the positive connection module of described the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement; Normally opened contact J16-3～J23-3 of described low-voltage relay J16-J23 ground connection respectively;
The PORT COM of the positive connection module U23 of the positive connection module of described the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM;
The coil of described low-voltage relay J16-J23 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described high-voltage relay J24-J25 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described change-over switch J connects respectively the corresponding PORT COM of described host computer U1.
The model of described host computer U1 is for grinding auspicious T90; The model of described insulation measurement module U2 is TOP415; The model of described dielectric loss measurement reversal connection module U3 is TOP413; The model of the positive connection module U23 of the positive connection module of described the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement is TOP414; The model of described change-over switch J is G6H; The model of described high-voltage relay J24-J25 is GL66SF; The model of described low-voltage relay J16-J23 is G7L-2A-P.
The course of work of the present invention is as follows:
High-voltage relay is used for the state of control transformer winding in measuring process: pressurization or ground connection; Change-over switch is used for selecting transformer measure the item: dielectric dissipation factor or insulation resistance; Dielectric loss measurement reversal connection module is used for the dielectric dissipation factor of measuring transformer; The positive connection module of dielectric loss measurement is used for the dielectric dissipation factor of measuring transformer winding casing tube, and it can just connect measurement module with dielectric loss and measure simultaneously; Insulation measurement module is used for the insulation resistance of measuring transformer.
To after the winding short circuit of transformer the same side, be connected with corresponding high-voltage relay, high-voltage relay number is corresponding with Transformer Winding group number, according to the requirement of the industry standard DL/T474.3 – of State Grid 2006 " directive/guide dielectric dissipation factor tan δ test is implemented in on-the-spot Insulation Test " and " power equipment hand-over and preventive test code ", switch the high-voltage relay of corresponding windings, the high-voltage relay that tested winding is corresponding switches to high pressure, high-voltage relay corresponding to non-tested winding switches to be held, and change-over switch is selected corresponding test module.
1. measuring transformer dielectric dissipation factor
(1) change-over switch is switched to measuring media loss factor state, high voltage interface input AC high pressure;
(2) high-voltage relay J25 normally closed contact is connected, switch to high pressure, high-voltage relay J24 switches to and holds, and low-voltage relay J16～J23 switches to and holds, and dielectric loss reversal connection measurement module is measured low-pressure side winding with the dielectric loss value between high pressure and transformer case;
(3) low-voltage relay J20～J23 switches to measuring junction, and dielectric loss is just connecing the dielectric loss value of measurement module measurement low-pressure side winding casing tube;
(4) high-voltage relay J24 normally closed contact is connected, switch to high pressure, high-voltage relay J25 changes to ground end, and low-voltage relay J16～J23 switches to and holds, and dielectric loss reversal connection measurement module is measured high-pressure side winding with the dielectric loss value between low pressure and transformer case;
(5) low-voltage relay J16～J19 switches to measuring junction, and dielectric loss is just connecing the dielectric loss value of measurement module measurement high-pressure side winding casing tube;
(6) high-voltage relay J24 and relay J 25 normally closed contacts are connected, and switch to high pressure, and dielectric loss reversal connection measurement module is measured high pressure, low-pressure side winding with the dielectric loss value between transformer case.
2. measuring transformer insulating resistance value
(1) change-over switch is switched J to measuring insulation resistance state, and low-voltage relay J16～J23 switches to and holds, high voltage interface input direct-current high pressure;
(2) high-voltage relay J24 and high-voltage relay J25 are switched to and hold, and continue to discharge over the ground two minutes;
(3) high-voltage relay J25 normally closed contact is connected, and switches to high pressure, and high-voltage relay J24 switches to and holds, and insulation measurement module is measured low-pressure side winding with the insulating resistance value between high pressure and transformer case;
(4) high-voltage relay J24 normally closed contact is connected, and switches to high pressure, and high-voltage relay J25 switches to and holds, and insulation measurement module is measured high-pressure side winding with the insulating resistance value between low pressure and transformer case;
(5) high-voltage relay J24 and high-voltage relay J25 normally closed contact are connected, and switch to high pressure, and insulation resistance module is measured high pressure, low-pressure side winding with the insulating resistance value between transformer case.
Claims (4)
1. Intelligent electric power transformer dielectric dissipation factor and an insulation resistance measuring device, is characterized in that: comprise host computer U1, insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement, change-over switch J, high-voltage relay group and low-voltage relay group;
Three phase windings after the identical voltage one side short circuit of power transformer connect respectively the corresponding port of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 successively through described high-voltage relay group, change-over switch J; The extension line of Winding in Power Transformer bottom shielding of bushing connects the corresponding port of the positive connection module group of described dielectric loss measurement through described low-voltage relay group; The power end of described insulation measurement module U2 and dielectric loss measurement reversal connection module U3 meets high-voltage ac power ACY through high-voltage power supply interface ACT respectively; The PORT COM of described insulation measurement module U2, dielectric loss measurement reversal connection module U3, the positive connection module group of dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM; The coil of described high-voltage relay group, change-over switch J, low-voltage relay group connects respectively the corresponding PORT COM of described host computer U1.
2. a kind of Intelligent electric power transformer dielectric dissipation factor according to claim 1 and insulation resistance measuring device, is characterized in that: described low-voltage relay group comprises low-voltage relay J1-J12; Described high-voltage relay group comprises high-voltage relay J13-J15; The positive connection module group of described dielectric loss measurement comprises the positive connection module U15 of the positive connection module of the 4th dielectric loss measurement U4 to the 15 dielectric loss measurement;
The swing arm end J13-1 of described high-voltage relay J13 connects three phase windings after three winding power transformer T1 high pressure one side short circuits; The normally opened contact J13-3 ground connection of described high-voltage relay J13;
The swing arm end J14-1 of described high-voltage relay J14 connects and in three winding power transformer T1, presses three phase windings after a side short circuit; The normally opened contact J14-3 ground connection of described high-voltage relay J14;
The swing arm end J15-1 of described high-voltage relay J15 connects three phase windings after three winding power transformer T1 low pressure one side short circuits; The normally opened contact J15-3 ground connection of described high-voltage relay J15;
The normally closed contact J15-2 of the normally closed contact J13-2 of described high-voltage relay J13, the normally closed contact J14-2 of high-voltage relay J14 and described high-voltage relay J15 meets respectively the swing arm end J-1 of described change-over switch J;
The normally closed contact J-2 of described change-over switch J connects the corresponding port of described insulation measurement module U2; The normally opened contact J-3 of described change-over switch J connects the corresponding port of described dielectric loss measurement reversal connection module U3;
Swing arm end J1-1～J12-1 of described low-voltage relay J1-J12 meets respectively the extension line X1-X12 of three winding power transformer T1 winding bushing tap BT1; Normally closed contact J1-2～J12-2 of described low-voltage relay J1-J12 connects respectively the corresponding port of the positive connection module U15 of the positive connection module of described the 1st dielectric loss measurement U4 to the 12 dielectric loss measurement; Normally opened contact J1-3～J12-3 of described low-voltage relay J1-J12 ground connection respectively;
The PORT COM of the positive connection module U15 of the positive connection module of described the 4th dielectric loss measurement U4 to the 15 dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM;
The coil of described low-voltage relay J1-J12 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described high-voltage relay J13-J15 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described change-over switch J connects respectively the corresponding PORT COM of described host computer U1.
3. a kind of Intelligent electric power transformer dielectric dissipation factor according to claim 1 and insulation resistance measuring device, is characterized in that: described low-voltage relay group comprises low-voltage relay J16-J23; Described high-voltage relay group comprises high-voltage relay J24-J25; The positive connection module group of described dielectric loss measurement comprises the positive connection module U23 of the positive connection module of the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement;
The swing arm end J24-1 of described high-voltage relay J24 connects three phase windings after double winding power transformer T2 high pressure one side short circuit; The normally opened contact J24-3 ground connection of described high-voltage relay J24;
The swing arm end J25-1 of described high-voltage relay J25 connects three phase windings after double winding power transformer T2 low pressure one side short circuit; The normally opened contact J15-3 ground connection of described high-voltage relay J25;
The normally closed contact J24-2 of described high-voltage relay J24 and the normally closed contact J25-2 of high-voltage relay J25 meet respectively the swing arm end J-1 of described change-over switch J;
The normally closed contact J-2 of described change-over switch J connects the corresponding port of described insulation measurement module U2; The normally opened contact J-3 of described change-over switch J connects the corresponding port of described dielectric loss measurement reversal connection module U3;
Swing arm end J16-1～J23-1 of described low-voltage relay J16-J23 meets respectively the extension line X21-X28 of double winding power transformer T2 winding bushing tap BT2; Normally closed contact J16-2～J23-2 of described low-voltage relay J16-J23 connects respectively the corresponding port of the positive connection module U23 of the positive connection module of described the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement; Normally opened contact J16-3～J23-3 of described low-voltage relay J16-J23 ground connection respectively;
The PORT COM of the positive connection module U23 of the positive connection module of described the 16th dielectric loss measurement U16 to the 23 dielectric loss measurement respectively with described host computer U1 two-way connection of corresponding PORT COM;
The coil of described low-voltage relay J16-J23 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described high-voltage relay J24-J25 connects respectively the corresponding PORT COM of described host computer U1;
The coil of described change-over switch J connects respectively the corresponding PORT COM of described host computer U1.
4. according to any Intelligent electric power transformer dielectric dissipation factor and insulation resistance measuring device described in claim 2 or 3, it is characterized in that: the model of described host computer U1 is for grinding auspicious T90; The model of described insulation measurement module U2 is TOP415; The model of described dielectric loss measurement reversal connection module U3 is TOP413; The model of the positive connection module U23 of the positive connection module of described the 4th dielectric loss measurement U4 to the 23 dielectric loss measurement is TOP414; The model of described change-over switch J is G6H; The model of described high-voltage relay J13-J15 and high-voltage relay J24-J25 is GL66SF; The model of described low-voltage relay J1-J12 and low-voltage relay J16-J23 is G7L-2A-P.
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| CN201410071488.7A CN103941100A (en) | 2014-02-28 | 2014-02-28 | Intelligent device for measuring dielectric loss factor and insulation resistance of power transformer |
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| CN201410071488.7A CN103941100A (en) | 2014-02-28 | 2014-02-28 | Intelligent device for measuring dielectric loss factor and insulation resistance of power transformer |
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