CN2152217Y

CN2152217Y - Comprehensive test device for transformer performance

Info

Publication number: CN2152217Y
Application number: CN 92240844
Authority: CN
Inventors: 王超声; 赵国军
Original assignee: HONGSHAN HIGH VOLTAGE TEST EQUIPMENT FACTORY HONGSHAN DISTRICT WUHAN CITY
Current assignee: HONGSHAN HIGH VOLTAGE TEST EQUIPMENT FACTORY HONGSHAN DISTRICT WUHAN CITY
Priority date: 1992-11-18
Filing date: 1992-11-18
Publication date: 1994-01-05
Anticipated expiration: 2002-11-18

Abstract

The utility model relates to a comprehensive testing device for the performance of a transformer. The utility model which is suitable for carrying out comprehensive test for various performances of a distributing transformer is composed of a main switching circuit, the circuit of measuring instrument and a controlling and protecting circuit. The utility model carry outs tests, such as empty load, load test, voltage ratio, group measurement, pressure-tight test, the pressure-tight test of oil, etc. Compared with the present testing device for the transformer, the utility model has the advantages of multiple test functions, convenient operation, high efficiency, safe working performance and the simple structure of the complete machine, and can meet the demands of the testing and the detecting work of the distributing transformer.

Description

Comprehensive test device for transformer performance

The utility model relates to a kind of transformer performance comprehensive test device that is suitable for the various performances of substation transformer, especially medium-small type distribution transformers are carried out integration test, can be used for the examination and test of products of transformer manufacturing firm and the transformer in using is regularly detected.

To various performance tests and the check of substation transformer before need dispatching from the factory, also must carry out regular detection to the transformer in using simultaneously, test and the project that detects have generally included zero load, load test, voltage ratio measurement, withstand voltage test, oily withstand voltage test etc., when existing transformer testing device uses each test item is all needed to connect separately test circuit and measurement instrument, complicated operation, inefficiency is usually made mistakes easily, so that damage instrument and show wrong data.On the other hand, also developed at present high precision transformer performance Auto-Test System device by microsystem control, has good automatic detection performance, but the structure more complicated of this system and device, cost an arm and a leg, maintenance is also very difficult when breaking down, thereby still can not promote the use of at large in China.

Task of the present utility model is to avoid above-mentioned weak point and a kind of transformer performance comprehensive test device that can carry out integration test to each test item of substation transformer is provided, it is not only easy and simple to handle, serviceability is safe and reliable, the detection efficiency height, and also complete machine structure is also comparatively simple.

Task of the present utility model is realized by following scheme: it is by main switch circuit; measurement instrument circuit and control protection electric circuit three parts are formed; main switch circuit includes the regulating circuit that the three-phase electric voltage regulator 1 that is connected in series with three-phase power line is formed; the transformation ratio test circuit that high-potting circuit that HT testing transformer TH single-phase and that connect is formed and automatic no-load voltage ratio electric bridge 2 are formed; the measurement instrument circuit is made up of the voltage sensor and the various instrument that are serially connected with the current sensor in the phase line and be connected in the phase line; be divided into power measurement appliance circuit and canonical measure appliance circuit two parts, control protection electric circuit is made up of control panel and digital measurement and overvoltage crowbar.

According to such scheme, main switch circuit is pressed set point value to tested transformer-supplied by the pressure regulation and the HT testing transformer of three-phase electric voltage regulator 1, zero load, load, withstand voltage, oily withstand voltage test can be carried out, the test of voltage ratio and wiring group can be carried out by automatic no-load voltage ratio electric bridge; The measurement instrument circuit is used for detecting, set and shows the phase current and the phase voltage of three-phase electric voltage regulator 1 input end and output terminal in the main switch circuit, also provides sampled data and signal for control protection electric circuit simultaneously; The function of control circuit is accurately to control the connection of each test event main switch circuit and the connection of corresponding instrument measurement circuit; and make the open circuit (disconnection) of non-test event; holding circuit includes the open-circuit-protection of current transformer; the short-circuit protection of voltage transformer (VT); the overvoltage and the overcurrent protection of withstand voltage and no-load test; at the beginning of the voltage ratio test; protection is pressed in rationing the power supply of secondary wiring error; the fast tripping protection of main circuit short circuit; the zero-bit starting self-lock protection that system boosts; test product impacts the protection of excision electronic circuit automatically when closing a floodgate test; can also the setting value and the measured value of trial voltage be followed the tracks of relatively amplification by operation amplifier circuit simultaneously; automatically finish the definite value and the timing of unloaded and withstand voltage test, interlock circuit of each control protection all adopts the proven technique scheme to guarantee its reliability.

In sum, it is many, easy and simple to handle to the utlity model has test function, the detection efficiency height, and serviceability is safe and reliable, and the comparatively simple characteristic of complete machine structure, can satisfy the needs of substation transformer test testing preferably.

Fig. 1 is a general structure block diagram of the present utility model.

Fig. 2 is the main switch circuit figure of an embodiment of the utility model.

Fig. 3 is the measurement instrument circuit diagram of an embodiment of the utility model.

Fig. 4 is the control panel wiring diagram of an embodiment of the utility model.

Fig. 5 is digital measurement and the overvoltage crowbar of an embodiment of the utility model.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing.

Main switch circuit as shown in Figure 2, has the terminal A that can join with three-phase supply, B, C and zero terminal N, terminal A, B, C serial connection fuse F1, F2, F3 and three-phase air switch Q and through current sensor CT4, the normally opened contact of CT5 and contactor K1 links to each other with the input end of three-phase electric voltage regulator 1, the driving mechanism of three-phase electric voltage regulator is made of servomotor SM and speed reduction unit, the output terminal of three-phase electric voltage regulator is through current sensor CT1, the normally opened contact of CT2 and contactor K3 and lead-out terminal a, b, c links to each other, at b, between the c and be connected to voltage sensor PT1, constitute regulating circuit, in addition, at the output terminal a of three-phase electric voltage regulator 1 phase circuit also and be connected to the secondary high-tension HT testing transformer TH that is output as, and be serially connected with fuse F6 in the link, the normally opened contact of current sensor CT3 and contactor K2, constitute the high-potting circuit, on the C of input end phase circuit and connect digital automatic no-load voltage ratio electric bridge 2, be serially connected with the normally opened contact of fuse F5 and contactor K4 on the input end of this digital automatic no-load voltage ratio electric bridge, the A1 of its output terminal, B1, be serially connected with the normally opened contact of contactor K5 on the C1 circuit, B1, go back and be connected to voltage sensor PT3 between the C1, the a1 of output terminal, b1, be serially connected with the normally opened contact of contactor K6 on the c1 circuit, constitute the transformation ratio test circuit.The power supply of the control protection electric circuit of whole testing device is provided by the A of the primary power overcurrent fuse F4 that communicates.

The measurement instrument circuit as shown in Figure 3; with the distolateral current sensor CT4 of three-phase electric voltage regulator 1 input; CT5 and reometer A1; A2; A3 is connected into three-phase total current metering circuit and is connected in series current relay J1; current sensor CT1 at the output end of three-phase electric voltage regulator 1; CT2 and reometer A4; A5; A6 and power meter W1; W2 is connected into the metering circuit of output voltage regulator electric current and power; and serial connection current relay J3; the current sensor CT3 distolateral in the input of HT testing transformer TH is connected in series mutually with reometer A7 and current relay J2; at terminal b; c place and the voltage sensor PT1 that connects link to each other with 6 grades of light current uni-directional push-button switches (KZJC type) SA6; SA6 also joins with the secondary of voltage sensor PT3; and link to each other with the input end of digital measurement and overvoltage crowbar; also provide ± 12V and 5V voltage simultaneously with D.C. regulated power supply 3() link to each other; therefore SA6 can connect the secondary and digital measuring instrument of voltage sensor PT1 or PT3 respectively; actual voltage value and setting value during with demonstration no-load voltage ratio or withstand voltage test; voltage sensor PT3 elementary by omnipotent commentaries on classics drag switch SA3 and HT testing transformer TH the measurement winding or with digital automatic no-load voltage ratio electric bridge 2 output terminal B1; C1 links to each other, and promptly finishes the actual voltage value of difference measuring voltage ratio or withstand voltage test with a sensor.In addition, also be connected to voltage table V1 and the universal seclector SA5 that detects power supply side line voltage, voltage table V2 and the universal seclector SA1 that detects pressure regulation mark directrix voltage respectively in the both sides of three-phase electric voltage regulator 1, frequency meter HZ is in order to monitor mains frequency.For the input end of the D.C. regulated power supply 3 of digital instrument and power electronics links to each other with the A of primary power.

Control protection electric circuit is shown in Fig. 4,5; wherein Fig. 4 is the control panel wiring diagram; there are fuse F4, F7 in the power supply input; and serial connection key switch SB1; and meet power light H1; contactor K1 and button S1, S2 and travel switch SL1 and normally closed contact KA1 are connected in series, and the side meets normally opened contact K1 and pilot lamp H2, are the combined floodgate control and the zero-bit latching circuit of main switch circuit.Auxiliary reclay KA1 is connected in series mutually with the normally opened contact of button S3, overcurrent relay J1, and the side meets normally opened contact KA1 and pilot lamp H3, constitutes the current foldback circuit of main switch circuit, can cut off main circuit when excess current or short circuit.Also select the fourth gear switch SA4 of usefulness by normally opened contact K1 serial connection pilot project at power end; contactor K4 in the I shelves wherein; K5; K6 also meets back and button S4; S5; serial connection; the side meets normally opened contact K4 and pilot lamp H4; be used for connecting the input/output terminal of digital automatic no-load voltage ratio electric bridge 2; constitute automatic no-load voltage ratio electric bridge contacting controling circuit; to carry out the voltage ratio test; contactor K7 and button S6 in the II shelves; the S7 serial connection; the side meets normally opened contact K7 and pilot lamp H5; be the group contacting controling circuit; be used to connect the combined floodgate control of group check; be two the tunnel in the III shelves; one the tunnel is contactor K3 and button S8; S9 and normally closed contact J3 are connected in series mutually; the side meets pilot lamp H6 and normally opened contact K3; for unloaded load test is closed a floodgate and current foldback circuit; combined floodgate and overcurrent protection when being used for unloaded and load test; another road meets six retaining switch SA2; SA2 and 6 auxiliary reclay KMA1; KMA2; KMA3; KMA4; KMA5; the KMA6 phase also connects; each current sensor accuracy selection circuit; can be communicated with the tap of six gears of current sensor CT1 and CT2 respectively; to adapt to the required size of current of test specimen (by 5A-100A); to improve the precision of measuring current value; the IV shelves also are divided into two the tunnel; one the tunnel be contactor K2 with time-delay break contact KT and normally closed contact KA2 serial connection and with the time relay KT that is connected in series and normally opened contact YJ mutually and connect; be connected in series mutually with button S10 time-delay moving together contact KT and travel switch SL2 more together; superpotential when the formation pressure regulator boosts (surpassing setting value) protection; and the side meets normally opened contact K2 and pilot lamp H7; be the pressure regulator overvoltage crowbar that boosts; by auxiliary reclay KA2 serial connection normally open contact J2 button S13 and and the normally opened contact KA2 and the pilot lamp H9 that connect form; overcurrent protection when being used for withstand voltage or oily withstand voltage test is the withstand voltage test current foldback circuit.Power end also and be connected to how to obey motor SM in this external control panel, input end at universal seclector SA4 also draws one the tunnel, by and the normally opened contact K2 that connects, K3, K7 and travel switch SL2, button S11, normally closed contact YJ, interlock button S12 is connected in series mutually with travel switch SL1, at button S11 place and be connected to pilot lamp H8, at interlock button S12 place and meet pilot lamp H10, the normally closed contact K1 that goes here and there in addition simultaneously and connect, K2, K3, K7 is connected in series mutually with servomotor starting capacitance C, one end of electric capacity connects with SM, the two ends of normally closed contact K1 also with interlock button S12 cross-over connection mutually, constitute three-phase electric voltage regulator control circuit, be used for controlling the buck of three-phase electric voltage regulator.Travel switch SL1, SL2 respectively have two contacts in the present embodiment, and it is arranged at 0 current potential and the noble potential place of three-phase electric voltage regulator 1 respectively.Fig. 5 is digital measurement and overvoltage protection electronic circuit; be divided into two the tunnel; one the tunnel is that signal amplifies and the value circuit; by amplifier F1 and resistance R 1; R2 forms the first order and amplifies; receive the transducing signal of voltage sensor PT1 or PT3; amplifier F2 and diode D1; D2; resistance R 3 is formed second level rectification and is amplified; amplifier F3 and resistance R 4; R5 further amplifies direct current signal; through resistance R 6 and and connect capacitor C 1; C2 and amplifier F4 and resistance R 7 capacitor C 3; C4 and amplifier F5 form the active fluid strainer of the big loop of binodal; the output terminal of F5 is divided into two the tunnel then; one the tunnel is sent to the input end of amplifier F7; one the tunnel links to each other with digital voltmeter DVM2; digital voltmeter is connected in series with adjustable resistance R8 and with adjustable resistance R9 and connect; power supply is supplied with by SA6; to measure actual voltage value; another road circuit of digital measurement circuit is a comparison control circuit; amplifier F6 resistance R 13; the circuit that R14 and digital voltmeter DVM1 form can be used to the setting and the demonstration of preset voltage; and output terminal and F7 linked; the signal input part of F6 is by switch S A7; variable resistor R15 links to each other with stabilized voltage supply; amplifier F7 is a Voltage Feedback formula absolute value comparison amplifier; by amplifier F7 resistance R 12; R11; R10; diode D3; light emitting diode DL and triode BG constitute; be serially connected with auxiliary reclay YJ on the collector of triode; when actual voltage value is higher than setting voltage value; can show from digital voltmeter DVM1 and DVM2 on the one hand; while F7 output HIGH voltage; make triode BG conducting, start YJ boosting or cut off experiment power supply with the control main switch circuit.F1-F7 is made of two LM324 integrated packages in the above-mentioned electronic circuit, the numeral pin of tie-point.

Various standard meter of the present utility model all adopts more than 0.5 class precision, and sensor and digital voltmeter can guarantee that the integration test precision of whole device reaches 0.5 grade more than 0.2 grade.

Claims

1; a kind of being suitable for to substation transformer; especially the various performances of medium-small type distribution transformers are carried out the transformer performance comprehensive test device of integration test; it is characterized in that it is by main switch circuit; measurement instrument circuit and control protection electric circuit three parts are formed; main switch circuit includes the regulating circuit that the three-phase electric voltage regulator (1) that is connected in series with three-phase power line is formed; high-potting circuit and automatic no-load voltage ratio electric bridge (2) that HT testing transformer TH single-phase and that connect forms are formed the transformation ratio test circuit; the measurement instrument circuit is made up of the voltage sensor and the various instrument that are serially connected with the current sensor in the phase line and be connected in the phase line; be divided into power measurement appliance circuit and canonical measure appliance circuit two parts, control protection electric circuit is made up of control panel and digital measurement and overvoltage crowbar.

2, by the described transformer performance comprehensive test device of claim 1, it is characterized in that distolateral current sensor CT4, CT5 and reometer A1, A2, the A3 of three-phase electric voltage regulator (1) input is linked to be three-phase total current metering circuit, and serial connection current relay I1.

3, by the described transformer performance comprehensive test device of claim 2, it is characterized in that in current sensor CT1, the CT2 of the output end of three-phase electric voltage regulator 1 and the metering circuit that reometer A4, A5, A6 and power meter W1, W2 are connected into output voltage regulator electric current and power, and serial connection current relay I3.

4,, it is characterized in that control panel is made of boost overvoltage crowbar, withstand voltage test current foldback circuit and three-phase electric voltage regulator control circuit of the combined floodgate control of main switch circuit and the current foldback circuit of zero-bit latching circuit, main switch circuit, automatic no-load voltage ratio electric bridge contacting controling circuit, group contacting controling circuit, unloaded load test combined floodgate and the current foldback circuit, current sensor accuracy selection circuit, the pressure regulator that link to each other with fourth gear switch SA4 by the described transformer performance comprehensive test device of claim 1.

5,, it is characterized in that digital measurement and overvoltage crowbar are amplified by signal and value circuit and proportional control circuit constitute by the described transformer performance comprehensive test device of claim 1.