CN209803292U - transformer direct-current resistance and on-load tap-changer comprehensive test device - Google Patents
transformer direct-current resistance and on-load tap-changer comprehensive test device Download PDFInfo
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- CN209803292U CN209803292U CN201920105963.6U CN201920105963U CN209803292U CN 209803292 U CN209803292 U CN 209803292U CN 201920105963 U CN201920105963 U CN 201920105963U CN 209803292 U CN209803292 U CN 209803292U
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Abstract
the utility model relates to a transformer direct current resistance and on-load tap-changer comprehensive test device, belonging to the technical field of transformer direct current resistance and on-load tap-changer comprehensive test devices; the technical problem to be solved is as follows: providing a transformer direct-current resistance and on-load tap-changer comprehensive testing device; the technical scheme for solving the technical problem is as follows: the LED display cabinet comprises a cabinet body, wherein the front surface of the cabinet body is provided with an LED display screen and a control button; one side of the box body is provided with a high-voltage test port and a low-voltage test port, and the other side of the box body is provided with a power supply module, a data communication module and a constant current source module; a control circuit board is arranged in the box body, a central controller is integrated on the control circuit board, and the central controller is respectively connected with the LED display screen, the control button, the data communication module and the constant current source module through wires; the data communication module is connected with the wireless temperature probe through a wireless network; the utility model discloses be applied to the place of measuring transformer direct current resistance.
Description
Technical Field
The utility model relates to a transformer direct current resistance and on-load tap-changer integrated test device belongs to a transformer direct current resistance and on-load tap-changer integrated test device technical field.
background
the direct-current resistance testing work of the transformer winding is an indispensable test item after the transformer is handed over, overhauled and changed with a tap switch, the on-load tap switch is the only moving part connected with a transformer loop, and therefore the on-load tap switch needs to be detected simultaneously during testing, and in the specification of power equipment handing over and preventive testing, the detection items comprise the steps of checking the action sequence of the on-load tap switch, measuring the switching time and the like.
the traditional test method of the two test items adopts a split type test method, namely, a transformer direct-current resistance tester and a transformer on-load tap-changer tester are used for wiring and testing respectively, because two independent instruments are provided, each instrument is provided with a special test wire, the separate wiring needs to be tested separately, particularly, when a single-phase direct resistance is selected, the wiring mode must be changed frequently, the wiring and disconnecting work wastes a large amount of manpower, material resources and labor time, and when the two instruments used for a conventional direct resistance test and an on-load switch test are used, the two parameters can be tested respectively only by 3-4 persons and wiring twice at least, so that time and labor are wasted.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome not enough that exists among the prior art, the technical problem that will solve is: providing a transformer direct-current resistance and on-load tap-changer comprehensive testing device; in order to solve the technical problem, the utility model discloses a technical scheme be: a transformer direct current resistance and on-load tap-changer comprehensive test device comprises a box body, wherein an LED display screen and a control button are arranged on the front surface of the box body;
A high-voltage test port and a low-voltage test port are arranged on one side of the box body, and a power supply module, a data communication module and a constant current source module are arranged on the other side of the box body;
A control circuit board is arranged in the box body, a central controller is integrated on the control circuit board, and the central controller is respectively connected with the LED display screen, the control button, the data communication module and the constant current source module through leads;
The power supply input end of the central controller is connected with the power supply module;
the data communication module is specifically a wireless communication module, and is connected with the wireless temperature probe through a wireless network;
the high-voltage test port and the low-voltage test port are respectively connected with the AD conversion module in series and then connected with the central controller;
The central controller is also connected with a data storage module.
The data communication module is also connected with the monitoring terminal.
the circuit structure of the power supply module is that an alternating current-to-direct current module is arranged in the power supply module, an alternating current input end of the module is sequentially connected with a fuse in series, and a thermistor is connected with a live wire end of alternating current;
The output end of the alternating current-to-direct current module is sequentially connected with a capacitor C1, an active capacitor C2, a voltage stabilizing diode TVS1 and a resistor RL in parallel and then connected with the output end of the power module.
The chip used by the constant current source module is an amplifier U1, and the circuit structure of the constant current source module is as follows:
a pin 2 of the amplifier U1 is connected with one end of a capacitor C13 in parallel, and one end of a resistor R13 is connected with one end of a resistor R4; a pin 3 of the amplifier U1 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with one end of a capacitor C12 in parallel and then is connected with a power supply input end;
the pin 6 of the amplifier U1 is connected with the other end of the capacitor C13 in parallel, and the other end of the resistor R13 is connected with one end of the resistor R6;
the other end of the resistor R6 is connected with one end of a capacitor C15 in parallel and then connected with the grid of a field effect transistor Q1, the source of the field effect transistor Q1 is connected with a 40V input power supply, and the drain of the field effect transistor Q1 is connected with the output end of the constant current source module after being connected with a resistor R16 in series.
a constant current source gear control module is also arranged in the constant current source module and performs gear control through a control button;
the chip that constant current source gear control module used is potentiometre U2, constant current source gear control module's circuit structure is:
pins 1, 2 and 7 of the potentiometer U2 are respectively connected with a central controller;
The 3 pins of the potentiometer U2 are sequentially connected with the 4 pins of the potentiometer U2 in parallel, one end of a capacitor C4, the cathode of a polar capacitor E2, one end of a capacitor C3, the anode of a polar capacitor E1, and the cathode of a voltage stabilizing diode T1 is grounded;
a pin 5 of the potentiometer U2 is connected with the cathode of the diode D1 in parallel and then is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a power input end;
a pin 6 of the potentiometer U2 is connected with the other end of the resistor C3 in parallel, the anode of the diode D1 is connected with the cathode of the polar capacitor E1, the anode of the voltage-stabilizing diode T1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with a-9V power supply input end;
The 8 pin of the potentiometer U2 is connected with the other end of the capacitor C4 in parallel and then connected with the anode of the active capacitor E2.
the front end circuit of AD conversion module is provided with signal conditioning and filtering module, the control chip that AD conversion module used is amplifier U3, AD conversion module's circuit structure is:
a pin 2 of the amplifier U3 is connected with one end of a resistor R23 in parallel and then is connected with one end of a resistor R24, and the other end of the resistor R23 is grounded;
a pin 3 of the amplifier U3 is connected with one end of a capacitor C65 in parallel and then connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a test port;
the 4 pins of the amplifier U3 are connected with one end of a capacitor C34 in parallel, one end of a capacitor C52 is connected with a-15V input power supply, and the other end of the capacitor C34 is connected with the other end of a capacitor C52 in parallel and then is grounded;
the pin 6 of the amplifier U3 is connected with the other end of the resistor R24 in parallel and then connected with one end of the resistor R30, and the other end of the resistor R30 is connected with one end of the capacitor C68 in parallel and then connected with the output end of the signal conditioning and filtering module;
the 7 pin of the amplifier U3 is connected with one end of a capacitor C33 in parallel, one end of a capacitor C51 is connected with a 15V input power supply in parallel, and the other end of the capacitor C33 is connected with the other end of a capacitor C51 in parallel and then is grounded.
the chip used by the data storage module is a data storage chip U4, and the circuit structure of the data storage module is as follows:
pins 5 and 6 of the data storage chip U4 are connected with a central controller;
the pin 8 of the data storage chip U4 is connected with the anode of the storage battery BT1 in parallel and then is connected with one end of the capacitor C30;
The pin 9 of the data storage chip U4 is connected with the other end of the capacitor C30 in parallel, and the negative electrode of the storage battery BT1 is grounded;
the pin 10 of the data storage chip U4 is connected with one end of a crystal oscillator X2;
The pin 11 of the data storage chip U4 is connected with the other end of the crystal oscillator X2;
The 12 pins of the data storage chip U4 are connected with a resistor R22 in series and then are connected with a 3.3V input power supply;
the pin 13 of the data storage chip U4 is connected with a resistor R21 in series and then is connected with a 3.3V input power supply;
the 14 pin of the data storage chip U4 is connected with a 3.3V input power supply.
the type of the amplifier U1 is OP 184; the potentiometer U2 is X9C 103; the amplifier U3 is of type OP 1177; the data storage chip U4 is model FM31L 272.
the utility model discloses beneficial effect for prior art possesses does: the utility model discloses a research and development a set of equipment, can accomplish transformer direct current resistance test and on-load tap-changer test work simultaneously, in the test process of two inspection projects, do not need frequent disconnect test wire to improve work efficiency; the utility model provides a testing device integrates the multifunctional module in a box, compact structure, light in weight, the interference killing feature is strong, can accomplish the test of transformer direct current resistance and on-load tap-changer, and only need once wiring, rely on the inside working mode switching function of box can be fast accurate accomplish the test of two experimental projects; will the utility model discloses be applied to among the present transformer routine test, can overcome the more problem of test point among the present test work, reduce the operation of taking out stitches of working a telephone switchboard, fundamentally has reduced testing personnel's intensity of labour, shortens test time.
drawings
The present invention will be further explained with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of the box body of the present invention;
fig. 2 is a schematic diagram of the circuit structure of the present invention;
fig. 3 is a circuit diagram of the power module of the present invention;
fig. 4 is a circuit diagram of the constant current source module of the present invention;
fig. 5 is a circuit diagram of a gear control module of the constant current source module of the present invention;
Fig. 6 is a circuit diagram of the AD conversion module of the present invention;
Fig. 7 is a circuit diagram of the data storage module of the present invention;
in the figure: the device comprises a box body 1, an LED display screen 2, a control button 3, a high-voltage test port 4, a low-voltage test port 5, a power module 6, a data communication module 7, a constant current source module 8, a central controller 9, a wireless temperature probe 10, an AD conversion module 11, a data storage module 12 and a monitoring terminal 13.
Detailed Description
as shown in fig. 1 to 7, the utility model relates to a transformer direct current resistance and on-load tap-changer comprehensive testing device, which comprises a box body 1, wherein the front surface of the box body 1 is provided with an LED display screen 2 and a control button 3;
a high-voltage test port 4 and a low-voltage test port 5 are arranged on one side of the box body 1, and a power supply module 6, a data communication module 7 and a constant current source module 8 are arranged on the other side of the box body 1;
a control circuit board is arranged in the box body 1, a central controller 9 is integrated on the control circuit board, and the central controller 9 is respectively connected with the LED display screen 2, the control button 3, the data communication module 7 and the constant current source module 8 through leads;
The power supply input end of the central controller 9 is connected with the power supply module 6;
The data communication module 7 is specifically a wireless communication module, and the data communication module 7 is connected with the wireless temperature probe 10 through a wireless network;
the high-voltage test port 4 and the low-voltage test port 5 are respectively connected with the AD conversion module 11 in series and then connected with the central controller 9;
the central controller 9 is also connected with a data storage module 12.
the data communication module 7 is also connected with a monitoring terminal 13.
the circuit structure of the power supply module 6 is that an alternating current-to-direct current module is arranged in the power supply module 6, an alternating current input end of the module is sequentially connected with a fuse in series, and a thermistor is connected with a live wire end of alternating current;
the output end of the alternating current-to-direct current module is sequentially connected with a capacitor C1, an active capacitor C2, a voltage stabilizing diode TVS1 and a resistor RL in parallel and then connected with the output end of the power module 6.
The chip used by the constant current source module 8 is an amplifier U1, and the circuit structure of the constant current source module 8 is as follows:
A pin 2 of the amplifier U1 is connected with one end of a capacitor C13 in parallel, and one end of a resistor R13 is connected with one end of a resistor R4; a pin 3 of the amplifier U1 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with one end of a capacitor C12 in parallel and then is connected with a power supply input end;
the pin 6 of the amplifier U1 is connected with the other end of the capacitor C13 in parallel, and the other end of the resistor R13 is connected with one end of the resistor R6;
the other end of the resistor R6 is connected in parallel with one end of the capacitor C15 and then connected with the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is connected with a 40V input power supply, and the drain of the field effect transistor Q1 is connected in series with the resistor R16 and then connected with the output end of the constant current source module 8.
A constant current source gear control module is also arranged in the constant current source module 8, and gear control is carried out through the control button 3;
The chip that constant current source gear control module used is potentiometre U2, constant current source gear control module's circuit structure is:
Pins 1, 2 and 7 of the potentiometer U2 are respectively connected with a central controller 9;
the 3 pins of the potentiometer U2 are sequentially connected with the 4 pins of the potentiometer U2 in parallel, one end of a capacitor C4, the cathode of a polar capacitor E2, one end of a capacitor C3, the anode of a polar capacitor E1, and the cathode of a voltage stabilizing diode T1 is grounded;
a pin 5 of the potentiometer U2 is connected with the cathode of the diode D1 in parallel and then is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a power input end;
a pin 6 of the potentiometer U2 is connected with the other end of the resistor C3 in parallel, the anode of the diode D1 is connected with the cathode of the polar capacitor E1, the anode of the voltage-stabilizing diode T1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with a-9V power supply input end;
the 8 pin of the potentiometer U2 is connected with the other end of the capacitor C4 in parallel and then connected with the anode of the active capacitor E2.
the front end circuit of the AD conversion module 11 is provided with a signal conditioning and filtering module, the control chip used by the AD conversion module 11 is an amplifier U3, and the circuit structure of the AD conversion module 11 is:
a pin 2 of the amplifier U3 is connected with one end of a resistor R23 in parallel and then is connected with one end of a resistor R24, and the other end of the resistor R23 is grounded;
a pin 3 of the amplifier U3 is connected with one end of a capacitor C65 in parallel and then connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a test port;
The 4 pins of the amplifier U3 are connected with one end of a capacitor C34 in parallel, one end of a capacitor C52 is connected with a-15V input power supply, and the other end of the capacitor C34 is connected with the other end of a capacitor C52 in parallel and then is grounded;
the pin 6 of the amplifier U3 is connected with the other end of the resistor R24 in parallel and then connected with one end of the resistor R30, and the other end of the resistor R30 is connected with one end of the capacitor C68 in parallel and then connected with the output end of the signal conditioning and filtering module;
the 7 pin of the amplifier U3 is connected with one end of a capacitor C33 in parallel, one end of a capacitor C51 is connected with a 15V input power supply in parallel, and the other end of the capacitor C33 is connected with the other end of a capacitor C51 in parallel and then is grounded.
the chip used by the data storage module 12 is a data storage chip U4, and the circuit structure of the data storage module 12 is:
pins 5 and 6 of the data storage chip U4 are connected with the central controller 9;
The pin 8 of the data storage chip U4 is connected with the anode of the storage battery BT1 in parallel and then is connected with one end of the capacitor C30;
The pin 9 of the data storage chip U4 is connected with the other end of the capacitor C30 in parallel, and the negative electrode of the storage battery BT1 is grounded;
the pin 10 of the data storage chip U4 is connected with one end of a crystal oscillator X2;
The pin 11 of the data storage chip U4 is connected with the other end of the crystal oscillator X2;
the 12 pins of the data storage chip U4 are connected with a resistor R22 in series and then are connected with a 3.3V input power supply;
the pin 13 of the data storage chip U4 is connected with a resistor R21 in series and then is connected with a 3.3V input power supply;
the 14 pin of the data storage chip U4 is connected with a 3.3V input power supply.
the type of the amplifier U1 is OP 184; the potentiometer U2 is X9C 103; the amplifier U3 is of type OP 1177; the data storage chip U4 is model FM31L 272.
The utility model discloses in the design, it is the output constant current source to have the on-load tap-changer experiment based on direct current resistance is experimental and direct current method, and all have common part on the wiring, all receive the instrument with high-pressure side AB/C/O port simultaneously promptly (direct resistance test adopts three channels with the survey method, consequently need all not all receive the instrument mutually), consequently, can use two kinds of test instruments combination as an instrument, in the design process, need accurate calculation components and parts parameter, rational configuration components and parts, design out two kinds of experimental required sampling processing units, and integrate the installation with each unit module, accomplish the preparation.
the utility model designs a box body 1 which adopts an all-aluminum alloy structure, a control button 3 is a structure combining an embedded button and a flying shuttle knob, and a signal output panel adopts the same terminal strip; in the aspect of an internal control system, in addition to independently testing two parameters of a direct-current resistor and an on-load tap-changer, a 'one-key measurement' concept is introduced in the aspect of testing the direct resistance, namely, a parameter instrument is set to automatically complete all winding resistance values of high and low voltages of a transformer, so that the testing time can be further reduced; in the test process, the wireless temperature probe can be connected with the wireless temperature probe, so that the temperature of the transformer can be measured in real time and referenced.
the utility model relates to a collection two kinds of functions tester as an organic whole, box metallic structure can reach anti-jamming effect, and the knob design has the analytic waveform when helping to have the load test, and a key is measured and can be saved a large amount of time, but wireless temperature measurement real time monitoring temperature data satisfies testing arrangement's measurement accuracy and interference killing feature requirement.
The utility model discloses a power module 6 has carried out effectual filtering and protection design to the input and the output of power, has reduced electrical power generating system's ripple, noise interference, can ensure to provide one set of clean stable power output for whole test system.
constant current source module 8 can provide stable constant current source to the direct resistance test with the test of having the load, the utility model discloses carry out optimal design to the constant current source, on guaranteeing that the constant current source is stable, small in noise, the high basis of precision, improved response speed and stability, it is accurate quick to ensure the data that two kinds of tests obtained.
Sampling system requires central controller 9 to carry out high-efficient stable processing to data collection, the utility model discloses a model is AD 7606's synchronous sampling chip, possesses 16 bits 8 passageways, carries out data acquisition to the measuring result, ensures data measurement's stability, reliability, high efficiency.
the utility model discloses external wireless temperature probe 10 uses the model to be DS18B20 temperature sensor chip, and chip dampproofing and waterproofing is by nonrust steel pipe package, installation convenient to use to adopt wireless communication module to give test instrument with the temperature data real-time transmission of monitoring.
the data storage module 12 is internally provided with a large-capacity ferroelectric storage chip FM31L272, so that the real-time storage of the measured data is ensured, and the reliability of the integral operation of the instrument is ensured due to the fact that the chip is provided with a watchdog circuit.
The utility model provides a direct current resistance test and on-load tap-changer parameter testing arrangement's technical parameter as follows:
the required parameters of the direct resistance measurement test current are as follows: three-phase testing: 5A + 5A, 1A + 1A, two grades are selectable; phase separation test: 10A, 5A, 1A, and the third gear can be selected;
test range:
10A：1.000mΩ~1Ω；
5A：10.00mΩ~4Ω，5A+5A，10mΩ~1Ω；
1A：100.0mΩ~20Ω，1A+1A，100mΩ~5Ω；
minimum resolution: 0.1u omega
accuracy: +/- (0.2% +2 word)
the parameters of the on-load tap-changer test are as follows: output current: 1.0A, 0.5A, 0.3A and third gear are selectable;
Resistance range: 0.1-10 omega at 1.0A gear; 5-20 omega at 0.5A gear; 10-40 omega at 0.3A gear;
resistance measurement accuracy: + (reading x 5% +5 words), resolution: 0.01 omega;
transition time measurement range: 1-250 mS;
transition time measurement accuracy: ± 1mS, resolution: 0.1 mS;
the sampling frequency is 10 KHz.
the test system realizes two test functions by installing a signal processing, acquiring and processing module, a stable constant current source module, a multifunctional switching module and a high-precision AD sampling module; the high-stability constant current source circuit can generate three paths of constant current sources for direct current resistance measurement and on-load tap-changer test; the multifunctional switching circuit can switch different signal samples (direct resistance slow sampling and on-load high-speed sampling); the high-precision AD sampling module converts the analog signals into digital signals, and the digital signals are processed by a 32-bit central processing unit, so that various required test parameters are calculated; the utility model discloses an integral type structural design, when carrying out two tests that detect the project, only need once only connect the test wire, then select through the human-computer interaction module and carry out corresponding test project, can accomplish the test of all projects.
example (b):
Use the utility model discloses test current transformer substation, test data as follows:
11, 12 months and 11 days in 2018, testing is carried out on a No. 2 main transformer of a certain 110kV transformer substation, and the parameters of the transformer are as follows:
the model is as follows: SSZ 11-50000/110;
rated voltage: (110 +/-8X 1.25%)/38.5 +/-2X 2.5%/10.5 kV;
Rated capacity: 50000 kVA;
Factory number: 201509-;
Delivery date: 2015.12, respectively;
The field test conditions were as follows:
time: 11/12/2018;
a place: a 110kV certain substation;
equipment: a transformer;
the equipment model is as follows: SSZ 11-50000/110;
The equipment state: power failure;
Test conditions were as follows: at first use direct current resistance tester and on-load tap-changer tester to test transformer and switch respectively, then use the utility model discloses the direct resistance of development is with on-load two unification instruments and is tested, and the test condition is as follows:
the test times were as follows:
the direct resistance tester is 35 minutes and 10 seconds;
the on-load tap-changer tester is 25 minutes and 50 seconds;
the direct resistance and load two-in-one device is added for 40 minutes and 33 seconds;
and (4) conclusion: use the utility model discloses device measuring result is accurate, two parts test experiment closes into partly, saves a large amount of time.
In the test of the direct resistance and the load switch of the transformer, the number of testers is reduced from 3-4 to 2 from the original number, and the test time is reduced from 61 min 00 s to 40 min 33 s.
It can therefore be concluded that: use the utility model discloses testing arrangement replaces traditional direct resistance testing arrangement and has load switch testing arrangement, can effectively improve the accuracy of testing result, the measuring time of reduction.
finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. The utility model provides a transformer direct current resistance and on-load tap-changer integrated test device which characterized in that: the LED lamp box comprises a box body (1), wherein an LED display screen (2) and a control button (3) are arranged on the front surface of the box body (1);
a high-voltage test port (4) and a low-voltage test port (5) are arranged on one side of the box body (1), and a power supply module (6), a data communication module (7) and a constant current source module (8) are arranged on the other side of the box body (1);
a control circuit board is arranged in the box body (1), a central controller (9) is integrated on the control circuit board, and the central controller (9) is respectively connected with the LED display screen (2), the control button (3), the data communication module (7) and the constant current source module (8) through leads;
the power supply input end of the central controller (9) is connected with the power supply module (6);
the data communication module (7) is specifically a wireless communication module, and the data communication module (7) is connected with the wireless temperature probe (10) through a wireless network;
the high-voltage test port (4) and the low-voltage test port (5) are respectively connected with the AD conversion module (11) in series and then are connected with the central controller (9);
the central controller (9) is also connected with a data storage module (12).
2. the transformer direct-current resistance and on-load tap-changer comprehensive testing device according to claim 1, characterized in that: the data communication module (7) is also connected with a monitoring terminal (13).
3. The transformer direct-current resistance and on-load tap-changer comprehensive testing device according to claim 2, characterized in that: the circuit structure of the power supply module (6) is that an AC-to-DC module is arranged in the power supply module (6), an AC input end of the module is sequentially connected with a fuse in series, and a thermistor is connected with a live wire end of AC;
The output end of the alternating current-to-direct current module is sequentially connected with a capacitor C1, an active capacitor C2, a voltage stabilizing diode TVS1 and a resistor RL in parallel and then connected with the output end of the power module (6).
4. the transformer direct-current resistance and on-load tap-changer comprehensive test device according to claim 3, characterized in that: the chip used by the constant current source module (8) is an amplifier U1, and the circuit structure of the constant current source module (8) is as follows:
a pin 2 of the amplifier U1 is connected with one end of a capacitor C13 in parallel, and one end of a resistor R13 is connected with one end of a resistor R4; a pin 3 of the amplifier U1 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with one end of a capacitor C12 in parallel and then is connected with a power supply input end;
The pin 6 of the amplifier U1 is connected with the other end of the capacitor C13 in parallel, and the other end of the resistor R13 is connected with one end of the resistor R6;
the other end of the resistor R6 is connected with one end of a capacitor C15 in parallel and then connected with the grid of a field effect transistor Q1, the source of the field effect transistor Q1 is connected with a 40V input power supply, and the drain of the field effect transistor Q1 is connected with the output end of the constant current source module (8) after being connected with a resistor R16 in series.
5. the transformer direct-current resistance and on-load tap-changer comprehensive test device according to claim 4, characterized in that: a constant current source gear control module is also arranged in the constant current source module (8), and gear control is carried out through a control button (3);
The chip that constant current source gear control module used is potentiometre U2, constant current source gear control module's circuit structure is:
pins 1, 2 and 7 of the potentiometer U2 are respectively connected with a central controller (9);
the 3 pins of the potentiometer U2 are sequentially connected with the 4 pins of the potentiometer U2 in parallel, one end of a capacitor C4, the cathode of a polar capacitor E2, one end of a capacitor C3, the anode of a polar capacitor E1, and the cathode of a voltage stabilizing diode T1 is grounded;
a pin 5 of the potentiometer U2 is connected with the cathode of the diode D1 in parallel and then is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a power input end;
a pin 6 of the potentiometer U2 is connected with the other end of the resistor C3 in parallel, the anode of the diode D1 is connected with the cathode of the polar capacitor E1, the anode of the voltage-stabilizing diode T1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with a-9V power supply input end;
the 8 pin of the potentiometer U2 is connected with the other end of the capacitor C4 in parallel and then connected with the anode of the active capacitor E2.
6. the transformer direct-current resistance and on-load tap-changer comprehensive test device according to claim 5, characterized in that: the front end circuit of AD conversion module (11) is provided with signal conditioning and filtering module, the control chip that AD conversion module (11) used is amplifier U3, the circuit structure of AD conversion module (11) is:
a pin 2 of the amplifier U3 is connected with one end of a resistor R23 in parallel and then is connected with one end of a resistor R24, and the other end of the resistor R23 is grounded;
a pin 3 of the amplifier U3 is connected with one end of a capacitor C65 in parallel and then connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a test port;
the 4 pins of the amplifier U3 are connected with one end of a capacitor C34 in parallel, one end of a capacitor C52 is connected with a-15V input power supply, and the other end of the capacitor C34 is connected with the other end of a capacitor C52 in parallel and then is grounded;
the pin 6 of the amplifier U3 is connected with the other end of the resistor R24 in parallel and then connected with one end of the resistor R30, and the other end of the resistor R30 is connected with one end of the capacitor C68 in parallel and then connected with the output end of the signal conditioning and filtering module;
the 7 pin of the amplifier U3 is connected with one end of a capacitor C33 in parallel, one end of a capacitor C51 is connected with a 15V input power supply in parallel, and the other end of the capacitor C33 is connected with the other end of a capacitor C51 in parallel and then is grounded.
7. the transformer direct-current resistance and on-load tap-changer comprehensive test device according to claim 6, characterized in that: the chip used by the data storage module (12) is a data storage chip U4, and the circuit structure of the data storage module (12) is as follows:
The pins 5 and 6 of the data storage chip U4 are connected with a central controller (9);
the pin 8 of the data storage chip U4 is connected with the anode of the storage battery BT1 in parallel and then is connected with one end of the capacitor C30;
The pin 9 of the data storage chip U4 is connected with the other end of the capacitor C30 in parallel, and the negative electrode of the storage battery BT1 is grounded;
the pin 10 of the data storage chip U4 is connected with one end of a crystal oscillator X2;
the pin 11 of the data storage chip U4 is connected with the other end of the crystal oscillator X2;
the 12 pins of the data storage chip U4 are connected with a resistor R22 in series and then are connected with a 3.3V input power supply;
The pin 13 of the data storage chip U4 is connected with a resistor R21 in series and then is connected with a 3.3V input power supply;
the 14 pin of the data storage chip U4 is connected with a 3.3V input power supply.
8. The transformer direct-current resistance and on-load tap-changer comprehensive test device according to claim 7, characterized in that: the type of the amplifier U1 is OP 184; the potentiometer U2 is X9C 103; the amplifier U3 is of type OP 1177; the data storage chip U4 is model FM31L 272.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709481A (en) * | 2019-01-22 | 2019-05-03 | 国网山西省电力公司长治供电公司 | DCR of Transformer and load ratio bridging switch comprehensive test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709481A (en) * | 2019-01-22 | 2019-05-03 | 国网山西省电力公司长治供电公司 | DCR of Transformer and load ratio bridging switch comprehensive test device |
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