CN2304131Y - Comprehensive detecting instrument for loaded tap-switch characteristics of electric transformer - Google Patents

Abstract

The utility model relates to a comprehensive detecting instrument for the loaded tap-switch characteristics of the electric transformer. The utility model is composed of a signal conditioning circuit, a data acquisition card, a microcomputer integration working station, etc. Under the power-off condition, the utility model can carry out non-discomposing test on the parameters of the loaded tap-switch of transition time, transition resistance, three-phase non-synchronization, etc., can carry out progressive test on the parameters of the loaded voltage-regulating transformer of direct current resistance, transformation ratio, etc., and can carry out storage, processing, display and consulting on the test data and print and output the experiment report.

Description

The power transformer load tap changer characteristic integrated tester

The utility model relates to a kind of apparatus of power transformer load tap changer characteristic test.

Load ratio bridging switch is one of assembly of ULTC most critical, be in operation and often want the working current of bringing onto load switching transformer, whether its quality good or not, sequence of movement and handoff procedure be reliable, be directly connected to the safe operation of transformer, dispatch from the factory, put into operation at shunting switch for this reason and during overhaul, all will carry out a series of test.Load ratio bridging switch adopts dc detection method to the measurement of sequence of movement when delivery test; And when putting into operation, adopt this method to bring great inconvenience to service work with overhaul, and this method can only be checked the sequence of movement of transient process, and can not check that selector switch and switch have or not open circuit situation in handoff procedure, more can't measure the resistance of transition resistance.The test that two other pilot project of often doing of ULTC is direct current resistance and transformation ratio all is to use Other Instruments to carry out respectively separately at present, the integration test of the ULTC of not knowing where to begin.

The purpose of this utility model is filled up the deficiency of above-mentioned existing power transformer load tap changer characteristic test device exactly.

The purpose of this utility model is to finish by transformation ratio test circuit, two circuit of charging Acquisition Circuit:

1, transformation ratio test circuit: civil power is connected through 13 pin and the stabilivolt (Z4) of transformer (T1) 3 pin and data collecting card (AD), and pass through one group of node (J4-1, J5-1, J6-1) of relay (J4, J5, J6) and 1,2,3 pin of terminal (LL1) respectively and link to each other, stabilivolt (Z4) other end is connected with 4 pin of transformer (T1) 4 pin and terminal (LL1); 14 pin of stabilivolt (Z5) termination data collecting card (AD), and 5,6,7 pin that pass through another group node (J4-2, J5-2, J6-2) and terminal (LL1) of relay (J4, J5, J6) respectively link to each other, and 8 pin of its other end and terminal (LL1), 4 pin of transformer (T1), 28 pin of data collecting card (AD) are connected; 1,2 pin of relay (J4, J5, J6) connect the 1-6 pin of data collecting card (AD) respectively, and the A1-A62 pin of data collecting card (AD) and computing machine (COM) slot connect one to one;

2, charging Acquisition Circuit: frame (AK) wiring is, 9 pin of terminal (LL2) connect 15 pin of data collecting card (AD) through resistance (R6), be connected on after stabilivolt (Z3) and electric capacity (C2) parallel connection between 12 pin of 15 pin of data collecting card (AD) and terminal (LL2), 12 pin of terminal (LL2) are connected with 27 pin of data collecting card (AD); 5 pin of terminal (LL2) connect 16 pin of data collecting card (AD) through resistance (R7), are connected on after stabilivolt (Z2) and electric capacity (C9) parallel connection between 12 pin of 16 pin of data collecting card (AD) and terminal (LL2); Constant current source (H1) is anodal to be connected through the node (J1-1) of diode (D2), relay (J1) and 4 pin of four-terminal resistance (R1), its 2 pin is connected with 1 pin of terminal (LL2), its 1 pin is connected through 17 pin of resistance (R8) with data collecting card (AD), its 3 pin is connected through 24 pin of resistance (R9) with data collecting card (AD), and electric capacity (C1) and stabilivolt (Z1) also are connected between 17 pin and 24 pin of data collecting card (AD); 4 pin of the negative pole connecting terminal (LL2) of constant current source (H1); Resistance (R5) and diode (D1) series connection are between 1 pin and 4 pin of terminal (LL2); 8 pin of terminal (LL2) are connected with its 12 pin; The 7-12 of data collecting card (AD) links to each other with 1,2 pin of relay (J1, J2, J3) respectively; The A1-A62 pin of data collecting card (AD) and computing machine (COM) slot connect one to one;

Frame (BK, CK) and frame (AK) wiring are roughly the same.

The utility model is connected with ULTC: when measuring transformation ratio, the transformer high-voltage winding A after the power failure, B, C, O and middle pressure winding Am, Bm, Cm, Om correspondence are linked the 1-8 pin of terminal (LL1); When measuring direct current resistance and transient process, transformer high-voltage winding A after the power failure, B, C, O and middle pressure winding Am, Bm, Cm, Om correspondence are linked the 1-8 pin of terminal (LL2), and high pressure winding A, B, C, O also are connected respectively to 9,10,11,12 pin of terminal (LL2) through independent line.

The utility model compared with prior art, its advantage is:

1.. transit time, transition resistance and three-phase asynchrony that the utility model need not to disintegrate under power-off condition and can test load ratio bridging switch;

2.. the utility model one facility have comprehensive function, except that transit time, transition resistance and the three-phase asynchrony of test load ratio bridging switch, direct current resistance and two parameters of transformation ratio that also can test power transformer;

3.. only need keyboard operation to automatically switch after the utility model field wiring finishes and finish different test events, and keeping records;

4.. historical data in each can be preserved, be managed to the utility model in period, and exportable test report.

The drawing of accompanying drawing is described as follows:

Accompanying drawing 1 is a transformation ratio test wiring diagram of the present utility model.Computing machine (COM) and data collecting card (AD) are formed control, collection, the processing enter circuit of whole instrument; Transformer (T1) is used to provide no-load voltage ratio test desired signal; Terminal (LL1) is used for being connected with tested transformer; Relay (J4, J5, J6) is used for handover measurement three-phase no-load voltage ratio respectively; Stabilivolt (Z4, Z5) is used for protected data capture card (AD);

Accompanying drawing 2 is direct current resistance of the present utility model, transit time, transition resistance and three-phase asynchrony test wiring diagram.Resistance (R6), electric capacity (C2) and voltage stabilizing diode (Z3) are formed the winding voltage acquisition circuit, and resistance (R7), electric capacity (C9) and voltage stabilizing diode (Z2) are formed the secondary voltage acquisition circuit; Four-terminal resistance (R1) and resistance (R8, R9), electric capacity (C1), stabilivolt (Z1) are formed current acquisition circuit; Constant current source (H1) and diode (D2), relay (J1) are formed the testing power supply supply circuit; Resistance (R5) and diode (D1) are formed holding circuit.The above is the composition explanation of frame (AK), and frame (BK, CK) and frame (AK) are formed roughly the same.Terminal (LL2) is used for being connected with tested transformer; Corresponding relays (J2, J3) is used for the handover measurement function in relay (J1) and the frame (BK, CK) in addition; Computing machine (COM) and data collecting card (AD) are with accompanying drawing 1;

Accompanying drawing 3 is front view (FV) and back views of the utility model housing.The 1st, display screen; The 2nd, keyboard; The 3rd, nameplate; The 4th, supply socket; The 5th, power switch; The 6th, the LL1 terminal; The 7th, the LL2 terminal; The 8th, radiator fan.

Below in conjunction with accompanying drawing,, be described further realizing preferred embodiment of the utility model:

The utility model is to aim under power-off condition the apparatus that ULTC is not disintegrated integration test and design.Its links to each other corresponding with the high and medium voltage winding of tested Y/Y connection transformer, can automatically switch its direct current resistance of step-by-step measurement, transformation ratio, transit time, transition resistance, three-phase not same period etc. parameter, and printout test report.

When measuring transformation ratio, the corresponding position that the transformer high-voltage winding A after the power failure, B, C, O and middle pressure winding Am, Bm, Cm, Om link terminal (LL1) is connected to the relevant position of accompanying drawing 1 by terminal (LL1).Data collecting card under the control of computing machine (COM) (AD) attracting electric relay (J4), thereby make civil power behind transformer (T1), be added on the high pressure winding (A, O) of tested transformer, receive simultaneously between 13 and 28 pin of data collecting card (AD) by 1,4 pin of relay node (J4-1) and terminal (LL1).Between 14 and 28 pin that the middle pressure winding (Am, Om) of tested transformer is received data collecting card (AD) by 5,6 pin and the relay node (J4-2) of terminal (LL1).Computing machine (COM) shows A phase transformation ratio measurement result by data acquisition and calculating to voltage between tested transformer high-voltage winding A, O and middle pressure winding Am, the Om on the screen of accompanying drawing 3.Stabilivolt (Z4, Z5) is used for protected data capture card (AD).The test of other two-phase transformation ratio similarly.

When measuring direct current resistance and transient process, the corresponding position that transformer high-voltage winding A after the power failure, B, C, O and middle pressure winding Am, Bm, Cm, Om link terminal (LL2), high pressure winding A, B, C, O also are connected to 9,10,11,12 pin of terminal (LL2) through independent line, are connected to the correspondence position of accompanying drawing 2 by terminal (LL2).With A is example mutually, the contact of engage relay (J1), constant current source (H1) charges to high pressure winding A, the O of tested transformer by diode (D2), four-terminal resistance (R1), computing machine (COM) is monitored the winding charging current by the voltage that detects electric capacity (C1) two ends, and the voltage at charging stable back collection electric capacity (C1) and electric capacity (C2) two ends promptly shows the test result of direct current resistance as calculated on screen.After charging was stable, the changeable load ratio bridging switch of staff was changed, and computing machine (COM) is then discerned automatically and changed the zero hour, and the voltage at continuous acquisition electric capacity (C9) two ends also is presented on the screen, and this waveform is exactly the transition waveform of shunting switch.Can clearly see transit time from this waveform, the constant current parameter in conjunction with constant current source (H1) can calculate the transition resistance value.Test the release relay (J1) that finishes, high pressure winding A, the O of tested transformer is by resistance (R5) and diode (D1) discharge, in order to avoid the generation high pressure is hurted sb.'s feelings and damaged instrument.The direct current resistance of other two-phase, transit time and transition resistance are measured similarly.

The measurement of three-phase synchronism need be connected A, B simultaneously, C charges mutually, stable back switching on-load tap-changer is changed, computing machine (COM) is then discerned automatically and is changed the zero hour, the voltage of continuous acquisition Y1, Y4, Y7 and distinguish A, B, C is presented at waveform on the screen, observes the three-phase asynchrony of load ratio bridging switch thus.

Claims (1)

1, a kind of power transformer load tap changer characteristic integrated tester, form by signal conditioning circuit, data collecting card and microcomputer industrial workstation etc., 1., civil power is connected through 13 pin and the stabilivolt (Z4) of transformer (T1) 3 pin and data collecting card (AD) it is characterized in that:, and pass through one group of node (J4-1, J5-1, J6-1) of relay (J4, J5, J6) and 1,2,3 pin of terminal (LL1) respectively and link to each other, stabilivolt (Z4) other end is connected with 4 pin of transformer (T1) 4 pin and terminal (LL1); 14 pin of stabilivolt (Z5) termination data collecting card (AD), and 5,6,7 pin that pass through another group node (J4-2, J5-2, J6-2) and terminal (LL1) of relay (J4, J5, J6) respectively link to each other, and 8 pin of its other end and terminal (LL1), 4 pin of transformer (T1), 28 pin of data collecting card (AD) are connected; 1,2 pin of relay (J4, J5, J6) connect the 1-6 pin of data collecting card (AD) respectively, and the A1-A62 pin of data collecting card (AD) and computing machine (COM) slot connect one to one; 2., frame (AK) wiring is, 9 pin of terminal (LL2) connect 15 pin of data collecting card (AD) through resistance (R6), be connected on after stabilivolt (Z3) and electric capacity (C2) parallel connection between 12 pin of 15 pin of data collecting card (AD) and terminal (LL2), 12 pin of terminal (LL2) connect 27 pin of data collecting card (AD); 5 pin of terminal (LL2) connect 16 pin of data collecting card (AD) through resistance (R7), are connected on after stabilivolt (Z2) and electric capacity (C9) parallel connection between 12 pin of 16 pin of data collecting card (AD) and terminal (LL2); Constant current source (H1) is anodal to be connected through the node (J1-1) of diode (D2), relay (J1) and 4 pin of four-terminal resistance (R1), its 2 pin is connected with 1 pin of terminal (LL2), its 1 pin is connected through 17 pin of resistance (R8) with data collecting card (AD), its 3 pin is connected through 24 pin of resistance (R9) with data collecting card (AD), and electric capacity (C1) and stabilivolt (Z1) also are connected between 17 pin and 24 pin of data collecting card (AD); 8 pin of terminal (LL2) are connected with its 12 pin; 4 pin of the negative pole connecting terminal (LL2) of constant current source (H1); Resistance (R5) and diode (D1) series connection are between 1 pin and 4 pin of terminal (LL2); The 7-12 of data collecting card (AD) links to each other with 1,2 pin of relay (J1, J2, J3) respectively; The A1-A62 pin of data collecting card (AD) and computing machine (COM) slot connect one to one; Frame (BK, CK) and frame (AK) wiring are roughly the same.

Images