CN211697987U - Inductance testing device for converter valve anode reactor - Google Patents

Abstract

The utility model discloses a converter valve anode reactor inductance test device, which comprises a DC resistance test module, a power frequency impedance test module, an MCU main control board, a temperature compensation measurement module, an LCD display screen, an auxiliary power supply module, a relay module and data Communication module, the DC resistance test module and the power frequency impedance test module are connected to the MCU main control board through the relay module, the temperature compensation measurement module is connected to the MCU main control board, the LCD display screen and the auxiliary power module are connected to the MCU main control board. The data communication module is connected to the MCU main control board and the PC computer through the wireless communication module, and the data communication module is connected to the MCU main control board and the PC computer through the RS485 communication interface. The beneficial effects of the utility model are as follows: a power frequency impedance test module, an MCU main control board and a temperature compensation measurement module are newly added to improve the accuracy of the inductance test.

Description

A converter valve anode reactor inductance testing device

technical field

The utility model relates to the field of inductance testing equipment, in particular to a converter valve anode reactor inductance testing device.

Background technique

The converter valve is the core equipment of the DC transmission project, which realizes the control of the DC voltage and power. The converter valve contains a large number of anode reactors. The anode reactor is the key component of the converter valve, which mainly protects the thyristor of the converter valve and improves the durability of the converter valve.

In actual work, it is necessary to test the inductance of the anode reactor to evaluate the performance change of the anode reactor. The bridge meter or LCR tester is usually used in the field to measure the inductance value of the anode reactor through high-frequency current, but the test results The large deviation from the nameplate value is mainly caused by the inconsistency between the field test current and test frequency and the laboratory test conditions, which makes it difficult to accurately measure the inductance parameters of the anode reactor.

Utility model content

In view of the above problems, the present utility model proposes an inductance testing device for the anode reactor of a converter valve, which mainly solves the problem that the inductance parameters of the anode reactor are difficult to measure accurately.

In order to solve the above-mentioned technical problem, the technical scheme that the utility model proposes is as follows:

A converter valve anode reactor inductance test device, comprising a DC resistance test module, a power frequency impedance test module, an MCU main control board, a temperature compensation measurement module, an LCD display screen, an auxiliary power supply module, a relay module and a data communication module. The DC resistance test module and the power frequency impedance test module are connected to the MCU main control board through the relay module, the temperature compensation measurement module is connected to the MCU main control board, and the LCD display screen and the auxiliary power module are connected to the MCU main control board, The data communication module is connected to the MCU main control board and the PC computer through the wireless communication module, and the data communication module is connected to the MCU main control board and the PC computer through the RS485 communication interface. The selection of the above modules or components can be determined according to the actual needs, and there is no limitation here. For example, the MCU main control board can be realized by the Hongjing STC12C5A48S2 single-chip microcomputer, and the LCD display can choose a 7-inch TJC8048X570-011C-Y smart serial LCD screen, etc. Wait.

In some embodiments, the DC resistance test module includes a charging power supply DC, a lithium battery power supply, a standard resistance R1, a standard resistance R2, a DC voltage sampling interface circuit V1 and a DC voltage sampling interface circuit V2, the charging power supply DC and lithium The battery power supply is electrically connected, and a series circuit is formed between the lithium battery power supply, the standard resistance R1, the standard resistance R2 and the reactor to be tested, and the DC voltage sampling interface circuit V1 collects the voltage between the reactor to be tested and the standard resistance R2. The DC voltage is connected to the MCU main control board after isolation and amplification processing. The DC voltage sampling interface circuit V2 collects the DC voltage at both ends of the standard resistor R2, and is connected to the MCU main control board after isolation and amplification processing. The input end is connected with an AC-DC converter, and the AC-DC converter is connected with an AC power source through a miniature circuit breaker.

In some embodiments, the power frequency impedance test module includes a miniature circuit breaker CB, an electric voltage regulator, a current booster, a current transformer CT, a current-type voltage transformer PT, a true RMS digital voltmeter, and a true RMS digital voltmeter. value digital display ammeter, the electric voltage regulator is connected to the reactor to be measured through a current booster, the current transformer CT is connected to the reactor to be measured and the true RMS digital display ammeter, the current-type voltage mutual inductance The device PT is connected with the reactor to be tested and the true RMS digital voltmeter, and the electric voltage regulator is controlled on and off by the miniature circuit breaker CB.

In some embodiments, the relay module is connected to the electric voltage regulator for switching the forward and reverse rotation of the DC motor in the electric voltage regulator, and the reactor to be tested is switched to DC through the relay module Resistance test loop or AC impedance test loop.

In some embodiments, the input of the electric voltage regulator is AC 220V, the output is AC 0-250V, and the capacity is 1KVA.

In some embodiments, the input voltage of the current booster is AC 250V, the output is AC0-20V, the output current is 0-40A, and the capacity is 1KVA.

In some embodiments, the relay module is an electromagnetic relay, and the control voltage is 12VDC.

The beneficial effects of the utility model are as follows: a power frequency impedance test module, an MCU main control board and a temperature compensation measurement module are added; The board calculates the sampling data, and the temperature compensation measurement module compensates the sampling temperature to simulate the laboratory environment and improve the accuracy of the inductance test.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model converter valve anode reactor inductance testing device;

Fig. 2 is the principle diagram of the DC resistance test of the anode reactor of the converter valve of the utility model;

Fig. 3 is the principle diagram of the utility model converter valve anode reactor inductance test;

4 is a schematic diagram of the relay module switching control reactor measurement loop of the present invention;

FIG. 5 is a schematic diagram of the relay module switching control DC motor of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear and definite, the content of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the accompanying drawings only show the part but not the whole content related to the present invention.

As shown in FIG. 1, the present embodiment proposes a converter valve anode reactor inductance test device, including a DC resistance test module 1, a power frequency impedance test module 2, an MCU main control board 3, a temperature compensation measurement module 4, an LCD The display screen 6, the auxiliary power supply module 7, the relay module 8 and the data communication module 9, the DC resistance test module 1 and the power frequency impedance test module 2 are connected to the MCU main control board 3 through the relay module 8, and the temperature compensation measurement module 4 is connected to the MCU main control board 3, the LCD display screen 6 and the auxiliary power module 7 are connected to the MCU main control board 3, the data communication module 9 is connected to the MCU main control board 3 and the PC computer through the wireless communication module 11, The data communication module 9 is connected to the MCU main control board 3 and the PC computer 12 through the RS485 communication interface. The selection of the above modules or components can be determined according to the actual needs, and there is no limitation here. For example, the MCU main control board can be realized by the Hongjing STC12C5A48S2 single-chip microcomputer, and the LCD display can choose a 7-inch TJC8048X570-011C-Y smart serial LCD screen, etc. Wait.

The power frequency impedance test module, the MCU main control board and the temperature compensation measurement module are added. The power frequency impedance test module can automatically adjust the high precision and large current through the internal negative feedback circuit. The MCU main control board calculates the sampled data, and the temperature The compensation measurement module compensates the sampling temperature, simulates the laboratory environment, and improves the accuracy of the inductance test.

As shown in FIG. 2 , the DC resistance test module 1 includes a charging power supply DC101, a lithium battery power supply 102, a standard resistance R1103, a standard resistance R2104, a DC voltage sampling interface circuit V1105 and a DC voltage sampling interface circuit V2106. The charging power supply DC101 It is electrically connected to the lithium battery power supply 102, and a series circuit is formed between the lithium battery power supply 102, the standard resistance R1103, the standard resistance R2104 and the reactor 107 to be tested. The sum of the DC voltages at both ends of the standard resistor R2104 is isolated and amplified, and then connected to the MCU main control board 3. The DC voltage sampling interface circuit V2106 collects the DC voltage across the standard resistor R2104, and is connected to the MCU main control after isolation and amplification. Board 3, the input end of the charging power supply DC101 is connected to the AC-DC converter 108, and the AC-DC converter 108 is connected to the AC power supply through a micro-circuit breaker.

As shown in FIG. 3 , the power frequency impedance test module 2 includes a miniature circuit breaker CB201, an electric voltage regulator 202, a current booster 203, a current transformer CT204, a current-type voltage transformer PT205, and a true RMS digital voltmeter And the true RMS digital display ammeter, the electric voltage regulator 202 is connected with the reactor 107 to be tested through the current booster 203, and the current transformer CT204 is connected to the tested reactor 107 and the true RMS digital display ammeter , the current-type voltage transformer PT205 is connected with the reactor 107 to be tested and the true RMS digital voltmeter, and the electric voltage regulator 202 is controlled on and off by the miniature circuit breaker CB 201 .

As shown in FIGS. 4 and 5 , the relay module 8 is connected to the electric voltage regulator 202 for switching the forward and reverse rotation of the DC motor in the electric voltage regulator 202 , and the reactor 107 to be tested passes through the The relay module 8 is switched to the DC resistance test loop or the AC impedance test loop. The relay module 8 can switch the reactor 107 under test to a DC resistance test loop or an AC impedance test loop, and control the forward and reverse rotation of the DC motor M in the electric voltage regulator 202 . The switching of the DC resistance test loop or the AC impedance test loop is realized through the switching contacts K1-1 and K1-2 of the relay K1, the contacts 1 and 2 of K1-1 are closed, the contacts 4 and 5 of K1-2 are closed, and the DC The resistance test circuit is connected; K1-1 contacts 1 and 3 are closed, K1-2 contacts 4 and 6 are closed, and the AC impedance test circuit is connected. The forward and reverse switching of the DC motor of the electric voltage regulator 202 is realized by controlling the switching contacts K2-1 and K2-2 of the relay K2, the contacts 1 and 2 of K2-1 are closed, and the contacts 4 and 5 of K2-2 are closed. , the DC motor M forward rotation loop is connected; when K2 is released, K2-1 contacts 1 and 3 are closed, K2-2 contacts 4 and 6 are closed, and the DC motor M reverse circuit is connected.

Further, the input of the electric voltage regulator 202 is AC 220V, the output is AC 0-250V, and the capacity is 1KVA.

Further, the input voltage of the current booster is AC 250V, the output is AC0-20V, the output current is 0-40A, and the capacity is 1KVA.

Further, the relay module 8 is an electromagnetic relay, and the control voltage is 12VDC.

Working principle: After closing the miniature circuit breaker 109, the charging power supply DC101 charges the lithium battery power supply 102, and after the charging is completed, the charging power supply DC is cut off, the relay module 8 is switched to the DC resistance measurement circuit, and a low-voltage DC current is applied to the reactor 107 under test. (1.5～2.5)A, measure the voltage between the reactor 107 under test and the standard resistance R1103 and the voltage U1 and the voltage U2 across the standard resistance R2104; the temperature compensation measurement module 4 measures the ambient temperature, and calculates the standard resistance value after temperature compensation Rt=R0 +α*(T-T0), R0 is the resistance value of the standard resistance at temperature T0, calculate the DC current I=U2/Rt through the reactor, calculate the DC voltage U=U1-U2 across the reactor 107 under test, Calculate the DC resistance R=U/I of the reactor 107 under test; switch the relay module 8 to the AC impedance test loop, apply a power frequency AC current (10-40) A, and measure the power frequency voltage ΔU and ΔU across the reactor 107 under test. Through the power frequency current ΔI, calculate the power frequency impedance Z=ΔU/ΔI of the reactor 107 under test; calculate the inductance L=SQRT ((Z ² -R ² )/100π) of the reactor 107 under test, and display the inductance L, DC resistance R, test current, and test temperature.

Work steps:

S1) use a test current clip to fix the busbar terminals connected to the reactor 107 to be tested, and the device is connected to the AC 220V power supply;

S2) Manually or automatically close the miniature circuit breaker 109 in the DC resistance test module 1 to power on the device, confirm that the output of the auxiliary power module 7 is normal, the device self-test has passed, the LCD display screen 6, the true RMS digital display voltmeter, The true RMS digital display ammeter shows normal;

S3) Start the DC resistance test button (not shown in the figure), the device automatically completes the measurement and temperature compensation of U1 and U2, and automatically completes the calculation and display of the DC resistance;

S4) Set the AC test current value, start the inductance test button (not shown in the figure), check whether the true RMS digital display voltmeter and the true RMS digital display ammeter display normal readings are normal, the device automatically completes the AC impedance measurement, automatically Complete the calculation and display of the inductance;

S4) According to the need, press the data transmission button (not shown in the figure), and transmit the test DC resistance, inductance, test current, temperature and other results to the PC computer 12 through the data communication module 9 or the wireless communication module 11.

S5) Press the stop button (not shown in the figure) to turn on the miniature circuit breaker in the DC resistance test module 1.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention with this. . All equivalent changes or modifications made according to the essence of the content of the present invention should be covered within the protection scope of the present invention.

Claims (7)

1. A converter valve anode reactor inductance test device, characterized in that, comprising a DC resistance test module (1), a power frequency impedance test module (2), an MCU main control board (3), a temperature compensation measurement module (4) ), LCD display screen (6), auxiliary power module (7), relay module (8) and data communication module (9), the DC resistance test module (1) and the power frequency impedance test module (2) pass through the relay module (8) Connect to the MCU main control board (3), the temperature compensation measurement module (4) is connected to the MCU main control board (3), the LCD display screen (6) and the auxiliary power module (7) are connected to the MCU main control board (3). The control board (3) is connected, the data communication module (9) is connected to the MCU main control board (3) and the PC computer (12) through the wireless communication module (11), and the data communication module (9) is connected through the RS485 communication interface Connect to the MCU main control board (3) and the PC computer (12). 2. The converter valve anode reactor inductance test device according to claim 1, wherein the DC resistance test module (1) comprises a charging power supply DC (101), a lithium battery power supply (102), a standard resistance R1 (103), a standard resistor R2 (104), a DC voltage sampling interface circuit V1 (105), and a DC voltage sampling interface circuit V2 (106), the charging power supply DC (101) is electrically connected to the lithium battery power supply (102), A series loop is formed between the lithium battery power supply (102), the standard resistance R1 (103), the standard resistance R2 (104) and the reactor to be measured (107), and the DC voltage sampling interface circuit V1 (105) collects the data to be measured The DC voltage between the reactor (107) and the standard resistor R2 (104) is isolated and amplified and then connected to the MCU main control board (3). The DC voltage sampling interface circuit V2 (106) collects the standard resistor R2 (104). The DC voltage at both ends of ) is connected to the MCU main control board (3) after isolation and amplification processing, and the input end of the charging power supply DC (101) is connected to the AC-DC converter (108), and the AC-DC converter is connected. (108) is connected to the AC power supply through a miniature circuit breaker (109). 3. The converter valve anode reactor inductance test device according to claim 1, wherein the power frequency impedance test module (2) comprises a miniature circuit breaker CB (201), an electric voltage regulator (202), A current booster (203), a current transformer CT (204), a current-type voltage transformer PT (205), a true RMS digital voltmeter and a true RMS digital ammeter, the electric voltage regulator (202) is provided by The current booster (203) is connected to the reactor under test (107), the current transformer CT (204) is connected with the reactor under test (107) and the true RMS digital display ammeter, and the current-type voltage transformer The device PT (205) is connected to the reactor to be tested (107) and the true RMS digital voltmeter, and the electric voltage regulator (202) is controlled on and off by the miniature circuit breaker CB (201). 4. The converter valve anode reactor inductance testing device according to claim 3, wherein the relay module (8) is connected to the electric voltage regulator (202) for switching the electric voltage regulator The forward and reverse rotation of the DC motor in the reactor (202), the reactor to be tested (107) is switched to the DC resistance test loop or the AC impedance test loop through the relay module (8). 5. The converter valve anode reactor inductance testing device according to claim 3, wherein the electric voltage regulator (202) has an input of AC 220V, an output of AC 0-250V, and a capacity of 1KVA. 6 . The converter valve anode reactor inductance testing device according to claim 3 , wherein the input voltage of the current booster is AC 250V, the output is AC0～20V, the output current is 0～40A, and the capacity is 1KVA . 7. The device for testing the inductance of an anode reactor of a converter valve according to claim 4, wherein the relay module (8) is an electromagnetic relay, and the control voltage is 12VDC.

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