CN104459526A - B-type residual current protecting circuit breaker testing device - Google Patents

Abstract

The invention discloses a B-type residual current protection circuit breaker testing device, which includes a touch screen, a PLC controller, a relay, an electronic load and a current testing module, wherein the current output circuit includes two links of a power supply and a residual current adjustment, The switching of the relay is controlled by the PLC controller to realize the generation of residual current and complete the measurement of the tripping current and breaking time of all tests. Through the above method, the B-type residual current circuit breaker test device provided by the present invention is used to detect and record the breaking time and tripping current value of the B-type residual current circuit breaker, and complete the B-type residual current operation in accordance with the GB22794-2008 standard All tests of circuit breaker products are also applicable to product tests of Type A and AC residual current operated circuit breakers.

Description

Type B residual current protection circuit breaker test device

technical field

The invention belongs to the field of intelligent detection instruments for low-voltage electrical appliances, in particular to a device for detecting breaking time and tripping current of a B-type residual current operated circuit breaker.

Background technique

Type B residual current operated circuit breaker test device is mainly used for the test of B type residual current operated circuit breaker products with a rated residual current of 500mA and below, in line with GB22794-2008 "Type B without and with overcurrent protection for household and similar purposes Residual current operated circuit breaker (Type B RCCB and Type B RCBO)" standard.

At present, most of the residual current operated circuit breaker test devices on the market are A-type or AC-type residual current operated circuit breaker test devices, and there is no test device that can cover the breaking time and tripping current detection of B-type residual current operated circuit breaker products. . Generally, the size of the output current is adjusted by switching switches and potentiometers, and the measurement results are displayed by digital tubes, which has a low degree of intelligence.

Contents of the invention

The technical problem mainly solved by the present invention is to provide a type B residual current protection circuit breaker testing device, which is used to detect and record the breaking time and tripping current value of the type B residual current circuit breaker, and complete the type B circuit breaker conforming to the GB22794-2008 standard All tests of residual current operated circuit breaker products are also applicable to A type and AC type residual current operated circuit breaker product tests.

In order to solve the above-mentioned technical problems, a technical solution adopted by the present invention is: a type B residual current protection circuit breaker testing device is provided, including a touch screen, a PLC controller, a relay, an electronic load and a current test module, the touch screen and The LC controller is connected, and the described PLC controller is provided with an I/O output port, a D/A output port and an A/D input port, and the described PLC controller passes through the I/O output port and the D/A The output port is connected with the relay and the electronic load, the current test module is connected with the PLC controller through the A/D input port, and also includes a current output circuit and a breaking time measurement circuit, and the relay is connected with the current output circuit , the relay and the current output circuit are respectively connected to the PLC controller through the electronic load, the current test module and the breaking time measurement circuit;

Wherein, the current output circuit includes two links of power supply and residual current regulation, and the switching of the relay is controlled by the PLC controller to realize the generation of residual current and complete the measurement of the tripping current and breaking time of all tests.

In a preferred embodiment of the present invention, the power supply link includes AC power supply, variable frequency power supply, smooth DC power supply, superimposed small DC power supply and pulsating DC power supply, and the above-mentioned power supply provides the residual current for the B-type residual current operation protection test, Wherein, the variable-frequency power supply and the superimposed small DC power supply are both current sources and control the size of the residual current; the described AC power supply, smooth DC power supply and pulsating DC power supply are all voltage-type power supplies and control the size of the electronic load and the residual current the size of.

In a preferred embodiment of the present invention, the frequency of the output current of the variable frequency power supply is 150Hz, 400Hz and 1000Hz, and the PLC controller controls the relay to switch the current of different frequencies into the current output loop.

In a preferred embodiment of the present invention, the superimposed small DC power supply is a current source that outputs 0-50mA, and the D/A output port of the PLC controller outputs a 0-20mA signal to control the magnitude of the current.

In a preferred embodiment of the present invention, the phase selection angle of the pulsating DC power supply is adjusted by a thyristor in the current output loop, and the phase selection angles are 0°, 90° and 135° respectively.

In a preferred embodiment of the present invention, the residual current of the B-type residual current operation protection test includes A-type residual current, AC-type residual current, sinusoidal AC residual current, smooth DC residual current, pulsating DC residual current, AC The residual current superimposes the smooth DC residual current and the pulsating DC residual current superimposes the smooth DC residual current.

In a preferred embodiment of the present invention, the pulsating DC residual current is generated by two-phase rectification and three-phase rectification.

In a preferred embodiment of the present invention, in the residual current regulation link, the D/A output port of the PLC controller outputs a 0-20mA signal to regulate the electronic load. When the AC power, smooth DC power and pulsating DC power enter the current output Controlling the size of the residual current in the circuit.

In a preferred embodiment of the present invention, the test device uses a Hall current sensor to measure the magnitude of the current in the current output loop.

In a preferred embodiment of the present invention, the relay switches the directions of smooth direct current, pulsating direct current, two-phase rectification and three-phase rectification.

The beneficial effects of the present invention are: the B-type residual current circuit breaker testing device of the present invention is used to detect and record the breaking time and tripping current value of the B-type residual current operated circuit breaker, and complete the B-type residual current circuit breaker conforming to the GB22794-2008 standard. All tests for current-operated circuit breaker products are also applicable to product tests for A-type and AC-type residual current-operated circuit breakers.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work, wherein:

Fig. 1 is a block diagram of a preferred embodiment of the B-type residual current protective circuit breaker testing device of the present invention;

Fig. 2 discloses the internal test main circuit of a kind of B-type residual current operated circuit breaker testing device according to the present invention;

Fig. 3 discloses a simplified diagram of the main circuit of a type B residual current operated circuit breaker test device in the test mode of type A residual current according to the present invention;

Fig. 4 discloses a simplified diagram of the main circuit of a B-type residual current operated circuit breaker test device in the AC-type residual current test mode according to the present invention;

Fig. 5 discloses a simplified diagram of the main circuit in the test mode of sinusoidal AC residual current at and below (150HZ-1000Hz) of a B-type residual current operated circuit breaker test device according to the present invention;

Fig. 6 discloses a simplified diagram of the main circuit in the smooth DC residual current test mode of a B-type residual current operated circuit breaker test device according to the present invention;

Fig. 7 discloses a simplified diagram of the main circuit in the test mode of AC residual current superimposing smooth DC residual current in a type B residual current operated circuit breaker test device according to the present invention;

Fig. 8 discloses a simplified diagram of the main circuit under the test mode of the pulsating DC residual current generated by the two-phase/three-phase rectified current of a type B residual current operated circuit breaker test device according to the present invention;

Fig. 9 discloses a simplified diagram of the main circuit of a B-type residual current operated circuit breaker test device in the test mode of pulsating DC residual current superimposing smooth DC residual current according to the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, the embodiment of the present invention includes:

A B-type residual current protection circuit breaker testing device, including a touch screen, a PLC controller, a relay, an electronic load and a current test module, the touch screen is connected to the LC controller, and the PLC controller is provided with an I/O O output port, D/A output port and A/D input port, the PLC controller is connected with the relay and the electronic load through the I/O output port and the D/A output port respectively, and the described current test module passes The A/D input port is connected to the PLC controller, and also includes a current output circuit and a breaking time measurement circuit, the relay is connected to the current output circuit, and the relay and the current output circuit pass through the electronic load and the current test module respectively And the breaking time measuring circuit is connected with the PLC controller;

Wherein, the current output circuit includes two links of power supply and residual current regulation, and the switching of the relay is controlled by the PLC controller to realize the generation of residual current and complete the measurement of the tripping current and breaking time of all tests. In the above, the current output circuit is the internal test main circuit of the B-type residual current operated circuit breaker test device, as shown in FIG. 2 .

The power supply includes 50Hz/220V AC power supply, variable frequency power supply (150Hz-1000Hz), smooth DC power supply, superimposed small DC power supply and pulsating DC power supply. The above-mentioned power supply provides the residual current for the B-type residual current operation protection test. Among them, the variable frequency power supply and superimposed small DC power supply are current sources, and the size of the residual current is controlled internally; the 50Hz/220V AC power supply, smooth DC power supply and pulsating DC power supply are all voltage-type power supplies, and the electronic load in the current output circuit is controlled size, thereby controlling the size of the residual current.

The frequency of the output current of the variable frequency power supply is 150Hz, 400Hz and 1000Hz, and the PLC controller controls the relay to switch the current of different frequencies into the main circuit of the test; the superimposed small DC power supply is the output 0-50mA current source, which is output through the D/A of the PLC controller The port outputs 0-20mA signal to control the current size; the pulsating DC power supply is adjusted by the test device through the thyristor to adjust the phase selection angle of the pulsating DC, and the phase selection angles are 0°, 90° and 135° respectively.

In the residual current regulation link, the PLC controller of the test device outputs a 0-20mA signal through the D/A output port to adjust the electronic load. control. The test device measures the current in the circuit through the Hall current sensor, and realizes the direction switching of smooth DC, pulsating DC, two-phase rectification and three-phase rectification through the relay.

The test results of the breaking action time of the test product are collected by pulse timing, and the remaining non-operating current value and operating current value of the test product are recorded by the test device.

The test of type B leakage products is carried out in the following 7 modes:

(1) Test mode of type A residual current;

(2) Test mode of AC residual current (50HZ);

(3) Test mode for sinusoidal AC residual current at and below 1000Hz (150HZ-1000Hz);

(4) Test mode for smooth DC residual current;

(5) Test mode in which AC residual current is superimposed on smooth DC residual current;

(6) Test mode for pulsating DC residual current generated by two-phase/three-phase rectified current;

(7) Test mode in which pulsating DC residual current is superimposed on smooth DC residual current.

The working principle of the test main circuit and the switching control of each part of the circuit disclosed in the present invention is realized by the following technologies:

(1) Circuit switching in the test mode of type A residual current

The simplified diagram of the main circuit of the test mode of type A residual current is shown in Figure 3.

When testing the tripping current of the sample, the application method of the residual current is "slow increase", and the relay K30/K31/K32/K33 is in the disconnected state; the control relay K1-A/K1-B/K1-C/K1-N Closing makes the test object in the front-end power-on state, and the control relay K15-A/K15-B/K15-C is closed to select the phase selection pulsating DC residual current to be applied to one of the A/B/C phases; When the angle is 0°, the synchronous control relays K11-N1 and K14-C2 are closed to select the small DC residual current to be superimposed on the N phase. When the phase selection angle is 90° and 135°, there is no need to superimpose the small DC residual current; the starting superposition is small For direct current, the control relays K9-1 and K9-2 are closed for application, and the control relay K6-1/K6-2 selects "forward" or "reverse"; pulsating DC phase selection angle (0°, 90°, 135 °) It is regulated by the tester through the thyristor, and the control relay K25 is closed to apply pulsating DC. The control relay K10-2 is closed to apply the electronic load, and gradually adjust the size of the electronic load to adjust the residual current;

When testing the breaking time of the test product, the residual current is applied in the "sudden increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; before the sudden increase, the control One of the phases in the relay K30/K31/K32 is closed, and the corresponding phase in the synchronous control relay K15-A/K15-B/K15-C is closed, which is used to select the phase selection pulsating DC residual current to be applied to the A/B/C phase One of the phases; the control relay K25 is closed to apply pulsating DC, the phase selection angle is automatically selected as 0°, and the control relay K10-2 is closed to adjust the electronic load so as to adjust the corresponding sudden residual current; then control the relay K30/ K31/K32 is disconnected to start the sudden current test without superimposing a small DC residual current.

(2) Circuit switching in test mode of AC residual current (50HZ)

The simplified diagram of the main circuit of the test mode of AC residual current (50HZ) is shown in Figure 4.

When testing the tripping current of the sample, the application method of the residual current is "slow increase", and the relay K30/K31/K32/K33 is in the disconnected state; the control relay K1-A/K1-B/K1-C/K1-N Closing makes the test object in the front-end power-on state; the control relay K1-A/K1-B/K1-C/ and K15-A/K15-B/K15-C are closed to select the residual current applied to the A/B/C phase A certain phase; the control relay K1-N is closed to form an AC residual current loop; the control relay K24 is closed to start the test; the control relay K10-2 is closed to apply an electronic load and gradually adjust the size of the electronic load.

When testing the breaking time of the test product, the residual current is applied in the "sudden increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; before the sudden increase, the control One of the phases in the relay K30/K31/K32 is closed, and the synchronous control relay K33 is closed to form an AC residual current loop, and adjust the electronic load to adjust the corresponding sudden residual current; then control the relay K30/K31/K32/K33 Disconnect to start the surge current test.

(3) Circuit switching under the test mode of sinusoidal AC residual current at and below 1000Hz (150HZ-1000Hz)

1000Hz and below (150HZ-1000Hz) sinusoidal AC residual current test mode simplified diagram of the main circuit is shown in Figure 5.

When testing the tripping current of the test product, the application method of the residual current is "slow increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; the relay K30/ K31/K32/K33 is disconnected; control K12-A1/K13-B1/K14-C1/K11-N1 and K12-A2/K13-B2/K14-C2/K11-N2 to select 1000Hz and below (150HZ~ 1000Hz ) The sinusoidal AC residual current is superimposed on one phase or N phase of A/B/C phase; the control relay K8-1/K8-2 is closed to start the test.

When testing the breaking time of the test product, the residual current is applied in the "sudden increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; before the sudden increase, the control One of the phases in the relay K30/K31/K32/K33 is closed, synchronously control the corresponding phases of K12-A1/K13-B1/K14-C1/K11-N1 and K12-A2/K13-B2/K14-C2/K11-N2 A certain phase is closed, and the residual current is selected to be superimposed on one of the A/B/C phases or N phases, and then the variable frequency power supply is adjusted to adjust the corresponding sudden residual current; then control the relay K30/K31/K32/K33 Disconnect to start the surge current test.

(4) Circuit switching in the test mode of smooth DC residual current

The simplified diagram of the main circuit of the test mode for smooth DC residual current is shown in Figure 6.

When testing the tripping current of the test product, the application method of the residual current is "slow increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; the relay K30/ K31/K32/K33 is disconnected; control K12-A1/K13-B1/K14-C1 /K11-N1 and K12-A2/K13-B2/K14-C2/K11-N2 to select smooth DC residual current superimposed on A /A certain phase or N phase in phase B/C; the control relay K8-1/K8-2 is closed to start the test. The control relay K24 is closed to start the test; the control relay K10-1 is closed to apply the electronic load, and gradually adjust the size of the electronic load; when the superimposed smooth DC residual current is started, the control relays K7-1 and K7-2 are closed to apply, Control relay K5-1/K5-2 to select "forward" or "reverse".

When testing the breaking time of the test product, the residual current is applied in the "sudden increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; before the sudden increase, the control One of the phases in the relay K30/K31/K32/K33 is closed, synchronously control the corresponding phases of K12-A1/K13-B1/K14-C1/K11-N1 and K12-A2/K13-B2/K14-C2/K11-N2 A certain phase is closed, and the smooth DC residual current is selected to be superimposed on a certain phase of A/B/C phase or N phase, and then the electronic load is adjusted to adjust the corresponding sudden residual current; then control the relay K30/K31/K32 /K33 is disconnected to start the sudden current test.

(5) Loop switching in the test mode of AC residual current superimposing smooth DC residual current

The simplified diagram of the main circuit of the test mode in which AC residual current is superimposed with smooth DC residual current is shown in Figure 7.

When testing the tripping current of the sample, the application method of the residual current is "slow increase", and the relay K30/K31/K32/K33 is in the disconnected state; the control relay K1-A/K1-B/K1-C/K1-N Closing makes the test object in the front-end power-on state, and the control relay K15-A/K15-B/K15-C is closed to select a smooth DC residual current to be applied to one of the A/B/C phases, and synchronously control K11-N1 /K12-A1/K13-B1/K14-C1 and K11-N2/K12-A2/K13-B2/K14-C2 achieve smooth DC residual current superimposed on one of the N/A/B/C phases, and The tester will be locked and not applied to the same phase as the AC residual current; the control relay K9-1 and K9-2 are closed to apply superimposed smooth DC residual current, and the control relay K6-1/K6-2 selects "forward" or " Reverse"; the control relay K10-2 is closed to apply the electronic load, and gradually adjust the size of the electronic load to adjust the residual current, and the synchronous control relay K24 starts the test.

When testing the breaking time of the test product, the residual current is applied in the "sudden increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; before the sudden increase, the control One of the phases in the relay K30/K31/K32 is closed, and the corresponding phase in the synchronous control K15-A/K15-B/K15-C is closed, which is used to select the AC residual current applied to the A/B/C phase. A certain phase; control relays K10-2 and K24 are closed to adjust the electronic load to adjust the corresponding sudden residual current; control K12-A1/K13-B1/K14-C1/ K11-N1 and K12-A2/K13 - A certain phase corresponding to B2/K14-C2/ K11-N2 is closed, and a small DC is selected to be superimposed on a certain phase of A/B/C phase or N phase, and the tester will lock and not be applied to the AC residual current The same phase; then the control relay K30/K31/K32/K33 is disconnected, and the sudden increase test is started.

(6) Circuit switching in test mode of pulsating DC residual current generated by two-phase/three-phase rectified current

The simplified diagram of the main circuit of the test mode of the pulsating DC residual current generated by the two-phase/three-phase rectified current is shown in Figure 7.

When testing the tripping current of the sample, the application method of the residual current is "slow increase", and the relay K30/K31/K32/K33 is in the disconnected state; the control relay K1-A/K1-B/K1-C/K1-N Closed to make the test product in the front-end power-on state; closed control relay K18/K19/K20 is used to control two-phase/three-phase current rectification in the positive half cycle, and closed control relay K21/K22/K23 is used to control two-phase/three-phase The current is rectified in the negative half cycle; the control relay K10-2 is closed to apply the electronic load, and gradually adjust the size of the electronic load, and start the test;

When testing the breaking time of the test product, the residual current is applied in the "sudden increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; before the sudden increase, the control A certain two-phase/three-phase closure of the relay K30/K31/K32/K33, synchronously control the corresponding two-phase/three-phase closure of the relay K18/K19/K20 or K21/K22/K23, select the rectification leakage current to be superimposed on a certain two-phase / three-phase, and then adjust the electronic load to adjust the corresponding sudden increase rectification leakage current; then control the relay K30/K31/K32/K33 to disconnect, start the sudden increase current test.

(7) Circuit switching in the test mode of pulsating DC residual current superimposing smooth DC residual current

The simplified diagram of the main circuit of the test mode in which the pulsating DC residual current is superimposed on the smooth DC residual current is shown in Figure 8.

When testing the tripping current of the sample, the application method of the residual current is "slow increase", and the relay K30/K31/K32/K33 is in the disconnected state; the control relay K1-A/K1-B/K1-C/K1-N Closing makes the test object in the front-end power-on state; the control relay K18/K19/K20 is closed to control the two-phase/three-phase current to rectify in the sinusoidal positive half cycle, and the control relay K21/K22/K23 is closed to control the two-phase/three-phase The phase current is rectified in the sinusoidal negative half cycle; the control relay K10-2 is closed to apply the electronic load, and gradually adjust the size of the electronic load, and start the test; synchronous control K12-A1/K13-B1/K14-C1/K11-N1 And K12-A2/K13-B2/K14-C2/K11-N2 select the smooth DC residual current to be superimposed on one phase or N phase in A/B/C phase, and the tester will lock not to be connected with two phases/three phases The pulsating DC residual current generated by phase rectification is applied to the same phase; when the superimposed smooth DC residual current is started, the control relays K6-1 and K6-2 are closed for application, and the control relay K9-1/K9-2 selects "forward" or " Reverse".

When testing the breaking time of the test product, the residual current is applied in the "sudden increase", and the control relay K1-A/K1-B/K1-C/K1-N is closed so that the test product is in the front-end power-on state; before the sudden increase, the control A certain two-phase/three-phase of the relay K30/K31/K32 is closed, and the corresponding two-phase/three-phase of the relay K18/K19/K20 or K21/K22/K23 is closed synchronously, and the rectified leakage current is superimposed on the corresponding two-phase /Three-phase; the control relay K10-2 is closed to apply the electronic load, and gradually adjust the size of the electronic load; then the control relay K30/K31/K32/K33 is disconnected to start the sudden current test. Synchronously control K12-A1/K13-B1/K14-C1/K11-N1 and K12-A2/K13-B2/K14-C2/K11-N2 to select a smooth DC residual current superimposed on one of A/B/C phases phase or N phase, and the tester will lock and not apply the same phase as the pulsating DC residual current generated by two-phase/three-phase rectification; when starting to superimpose smooth DC residual current, the control relays K6-1 and K6-2 are closed to apply , control relay K9-1/K9-2 to select "forward" or "reverse".

The overall appearance of the B-type residual current protective circuit breaker testing device of the present invention (not shown in the figure) includes the chassis body, the front panel part of the chassis, the rear panel part of the chassis and the inside of the chassis. Among them, the front panel of the chassis includes a touch screen, terminal blocks, indicator lights, emergency stop button and power button; the rear panel of the chassis includes a circuit breaker, three-phase four-wire power inlet, AC 220V power inlet and fan; the inside of the chassis includes a PLC measurement and control unit , relay module, electronic load (for adjusting the current in the test circuit), current measurement module, breaking time timing pulse and current output circuit; the current output circuit mainly includes variable frequency power supply, smooth DC power supply, and pulsating DC phase angle controller.

The main function of the test device: generate and adjust the operating current that meets the standard of type B residual current circuit breaker, record the breaking time and tripping current, so as to measure the breaking performance of the circuit breaker.

The types of residual current generated and adjustable by the test device are:

(1) 50Hz-1000Hz AC residual current;

(2) Composite wave current consisting of 50Hz, 1kHz and 10Hz frequencies;

(3) AC residual current superimposed smooth DC residual current;

(4) The pulsating DC residual current is superimposed on the smooth DC residual current;

(5) Pulsating DC residual current (with closing phase angle control);

(6) The DC residual current generated by the rectifier circuit with two-phase power supply;

(7) The DC residual current generated by the rectifier circuit with three-phase power supply;

(8) Smooth DC residual current.

The test device adopts touch screen, PLC controller, electronic load, variable frequency power supply and smooth DC power supply to adjust the current flowing through the test object of B-type leakage circuit breaker. The test mode can be selected on the touch screen, the test parameters can be set, the test results can be displayed, and the test results can be saved. Test Data. The PLC controller receives instructions, and can control the variable frequency power supply and smooth DC power supply in the AC residual current test mode or the pulsating DC residual current test mode, and form a loop with electronic loads and test samples for slow current application and sudden current application. circuit, and complete the measurement of tripping current and breaking time.

The variable frequency power supply is a voltage source, and the output current frequency is 150Hz, 400Hz, 1000Hz sine wave and composite wave composed of 50Hz, 1kHz and 10Hz frequency, and the switching of these four waveforms is realized through the relay. The smooth DC power supply is a 0-50mA current source.

Variable frequency power supply and smooth DC power supply can adjust the types of current including pulsating DC, 50Hz AC, two-phase rectification, three-phase rectification, and smooth DC. 100mA-1000mA, 1000mA-2000mA, the deviation of the actual output current value relative to the measured value is less than 0.5%.

The PLC controller outputs 0-20mA analog quantity through the D/A output port to adjust the electronic load to realize the control of the current. The current in the loop is measured by the Hall current sensor, and the current is measured in three ranges, 0-100mA, 100mA-1000mA, 1000mA-2000mA.

The PLC controller measurement and control unit automatically switches to the corresponding range output current through the control relay according to the set target current.

The breaking time timing pulse detects the breaking time of the test sample. The tester converts the current signal in the loop into a pulse width signal through the trigger circuit, and then measures the time. In the range of 0-1000ms, the deviation of the breaking time measured by the leakage tester relative to the measurement value is within the range of ±2ms.

The test device realizes switching between smooth DC, pulsating DC, two-phase rectification and three-phase rectification through relays. Apply current to a random pole among the four poles A, B, C, and N of the circuit breaker by controlling the relay.

The tester adjusts the closing phase angle of the pulsating DC through the thyristor. There are three closing phase angles of the pulsating DC, namely 0°, 90°, and 135°. The switching of the three closing phase angles is realized by a relay.

In summary, the B-type residual current protection circuit breaker test device of the present invention is used to detect and record the breaking time and tripping current value of the B-type residual current protection circuit breaker, and complete the B-type residual current operation according to the GB22794-2008 standard. All tests of circuit breaker products are also applicable to product tests of Type A and AC residual current operated circuit breakers.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description of the present invention, or directly or indirectly used in other related technical fields, shall be The same reasoning is included in the patent protection scope of the present invention.

Claims (10)

1. a Type B Aftercurrent protection circuit breaker proving installation, it is characterized in that, comprise touch-screen, PLC, relay, electronic load and testing current module, described touch-screen is connected with LC controller, described PLC is provided with I/O delivery outlet, D/A delivery outlet and A/D input port, described PLC is connected with electronic load with relay with D/A delivery outlet respectively by I/O delivery outlet, described testing current module is connected with PLC by A/D input port, also comprise electric current output loop and break metering circuit, described relay is connected with electric current output loop, described relay and electric current output loop are respectively by electronic load, testing current module and break metering circuit are connected with PLC,

Wherein, described electric current output loop comprises power supply and residual current regulates two links, by the switching of PLC pilot relay, realizes the generation of residual current and completes the drop-away current of all testing experiments and the measurement of break.

2. Type B Aftercurrent protection circuit breaker proving installation according to claim 1, it is characterized in that, described power supply link comprises AC power, variable-frequency power sources, smooth direct current power supply, superposes little direct supply and Voltage pulsating direct-current supply, the residual current providing Type B aftercurrent action protecting to test by above-mentioned power supply, wherein, described variable-frequency power sources and the little direct supply of superposition are current source and control the size of residual current; Described AC power, smooth direct current power supply and Voltage pulsating direct-current supply are voltage-type power supply and control the size of electronic load and the size of residual current.

3. Type B Aftercurrent protection circuit breaker proving installation according to claim 2; it is characterized in that; the frequency of described variable-frequency power sources output current is 150Hz, 400Hz and 1000Hz, and the electric current being switched different frequency by PLC pilot relay enters electric current output loop.

4. Type B Aftercurrent protection circuit breaker proving installation according to claim 2, is characterized in that, the little direct supply of described superposition, for exporting 0-50mA current source, exports by the D/A delivery outlet of PLC the size that 0-20mA signal controls electric current.

5. Type B Aftercurrent protection circuit breaker proving installation according to claim 2, is characterized in that, described Voltage pulsating direct-current supply regulates the phase selection angle of pulsating direct current by the controllable silicon in electric current output loop, and phase selection angle is respectively 0 °, 90 ° and 135 °.

6. Type B Aftercurrent protection circuit breaker proving installation according to claim 2; it is characterized in that, the residual current of described Type B aftercurrent action protecting test comprises A type residual current, AC type residual current, simple alternating current residual current, smooth direct current residual current, pulsating direct current residual current, exchanges residual current superposition smooth direct current residual current and pulsating direct current residual current superposition smooth direct current residual current.

7. Type B Aftercurrent protection circuit breaker proving installation according to claim 6, is characterized in that, described pulsating direct current residual current produced by two commutating phases and three phase rectifier electric current.

8. Type B Aftercurrent protection circuit breaker proving installation according to claim 2; it is characterized in that; described residual current governing loop exports 0-20mA Signal Regulation electronic load by the D/A delivery outlet of PLC, the control when AC power, smooth direct current power supply and Voltage pulsating direct-current supply enter electric current output loop to residual current size.

9. Type B Aftercurrent protection circuit breaker proving installation according to claim 1, is characterized in that, described proving installation adopts the size of current in Hall current sensor measurement electric current output loop.

10. Type B Aftercurrent protection circuit breaker proving installation according to claim 1, is characterized in that, the direction of described relay to smooth direct current, pulsating direct current, two commutating phases and three phase rectifier switches.