CN213302454U - Low-voltage contactor detection device - Google Patents
Low-voltage contactor detection device Download PDFInfo
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- CN213302454U CN213302454U CN202022198874.6U CN202022198874U CN213302454U CN 213302454 U CN213302454 U CN 213302454U CN 202022198874 U CN202022198874 U CN 202022198874U CN 213302454 U CN213302454 U CN 213302454U
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Abstract
The utility model relates to a low-voltage contactor detection device, include: the circuit comprises a control circuit, a switch driving circuit, an input source, an isolation circuit, a first test circuit and a second test circuit; the input end of the input source is connected with an alternating current source, the control end of the input source is connected with the control circuit, the first output end of the input source is connected with the input end of the isolation circuit, the second output end of the input source is connected with the first end of the second test circuit, the second end of the second test circuit is connected with the working coil of the contactor to be tested, the output end of the isolation circuit is connected with the first end of the first test circuit, the second end of the first test circuit is connected with the control circuit, and the test end of the first test circuit is connected with the main contact of the contactor to be tested; and the third end of the second test circuit is connected with the control circuit, and the third end of the first test circuit and the fourth end of the second test circuit are connected with the switch driving circuit. The detection device can detect the circuit and the performance of the contactor, can find the defects of the contactor in time and avoid the deterioration of the contactor.
Description
Technical Field
The utility model relates to a technical field that contactor detected, more specifically say, relate to a low-voltage contactor detection device.
Background
The contactor, as a typical electrical component, not only can switch on and off a circuit, but also has a low-voltage release protection function, is suitable for frequent operation and remote control operation, is one of important components in an automatic control system, and is widely applied to various automatic control circuits. Load switches such as motors and electric heaters in power stations are generally controlled to be started and stopped frequently in a remote mode by contactors. The performance of the contactor directly affects the stability of various devices.
The contactor is applied to a frequently-operated circuit, the electrical service life of the contactor is mainly influenced by point abrasion and arc extinguishing performance of a moving contact and a fixed contact, however, a professional detection instrument or a detection circuit for the contactor is not available at present, and therefore, the performance of the contactor cannot be guaranteed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a low voltage contactor detection device is provided.
The utility model provides a technical scheme that its technical problem adopted is: constructing a low-voltage contactor detection device comprising: the circuit comprises a control circuit, a switch driving circuit, an input source, an isolation circuit, a first test circuit and a second test circuit;
the input end of the input source is connected with an alternating current source, the control end of the input source is connected with a control circuit, the first output end of the input source is connected with the input end of the isolation circuit, the second output end of the input source is connected with the first end of the second test circuit, the second end of the second test circuit is connected with a working coil of a contactor to be tested, the output end of the isolation circuit is connected with the first end of the first test circuit, the second end of the first test circuit is connected with the control circuit, and the test end of the first test circuit is connected with a main contact of the contactor to be tested; and the third end of the second test circuit is connected with the control circuit, and the third end of the first test circuit and the fourth end of the second test circuit are connected with the switch driving circuit.
Preferably, the input source comprises: a first voltage regulator and a second voltage regulator;
the input end of the first voltage regulator is connected with the alternating current source, the output end of the first voltage regulator is connected with the input end of the isolation circuit, and the control end of the first voltage regulator is connected with the control circuit;
the input end of the second voltage regulator is connected with the alternating current source, and the output end of the second voltage regulator is connected with the first end of the second test circuit;
the input of first voltage regulator with the input of second voltage regulator does the input of input source, the output of first voltage regulator with the output of second voltage regulator does the output of input source, the control end of first voltage regulator with the control end of second voltage regulator does the control end of input source.
Preferably, the method further comprises the following steps: and the input processing circuit is arranged between the output end of the second voltage regulator and the first end of the first test circuit.
Preferably, the input processing circuit comprises: a rectifier bridge and a filter circuit;
the input of rectifier bridge is connected the output of second voltage regulator, the output of rectifier bridge is connected filter circuit's input, filter circuit's output is connected second test circuit's first end.
Preferably, the isolation circuit includes: an isolation transformer.
Preferably, the first test circuit includes: the device comprises a direct current source, a switching circuit, a current sampling circuit, a first voltage sampling circuit and a contact end connected with a main contact of the contactor to be tested;
the first end of the direct current source is connected with the second end of the switch circuit, the first end of the switch circuit is connected with the first output end of the isolation circuit, the control end of the switch circuit is connected with the switch driving circuit, the third end of the switch circuit is connected with the input terminal of the contact end, the sampling end of the first voltage sampling circuit is connected between the third end of the switch circuit and the input terminal of the contact end, the output end of the first voltage sampling circuit is connected with the control circuit, the second end of the direct current source and the output terminal of the contact end are connected with the second end of the current sampling circuit, the first end of the current sampling circuit is connected with the second output end of the isolation circuit, and the output end of the current sampling circuit is connected with the control circuit;
the first end of the switch circuit is the first end of the first test circuit, the contact end is the test end of the first test circuit, the control end of the switch circuit is the third end of the first test circuit, and the output end of the first voltage sampling circuit is the second end of the first test circuit.
Preferably, the current sampling circuit includes: a flow divider.
Preferably, the contact end includes: a first sub-contact end, a second sub-contact end, a third sub-contact end; the first voltage sampling circuit includes: the device comprises a first sub-voltage sampling circuit, a second sub-voltage sampling circuit, a third sub-voltage sampling circuit and a linked switch;
the input end of the first sub-contact end, the input end of the second sub-contact end and the input end of the third sub-contact end are connected with the third end of the switch circuit, the sampling end of the first sub-voltage sampling circuit is connected between the input end of the first sub-contact end and the third end of the switch circuit, the sampling end of the second sub-voltage sampling circuit is connected between the input end of the second sub-contact end and the third end of the switch circuit, and the sampling end of the third sub-voltage sampling circuit is connected between the input end of the third sub-contact end and the third end of the switch circuit;
the ganged switch is arranged between the input end and the output end of the first voltage sampling circuit; the output end of the first sub-contact end, the output end of the second sub-contact end and the output end of the third sub-contact end are connected to the second end of the current sampling circuit, and the output end of the first sub-contact end, the output end of the second sub-contact end and the output end of the third sub-contact end are grounded through the ganged switch.
Preferably, the second test circuit includes: the control switch and the second voltage sampling circuit;
the input end of the control switch is connected with the output end of the filter circuit, the output end of the control switch is connected with the working coil of the contactor to be tested, and the control end of the control switch is connected with the switch driving circuit;
the input end of the second voltage sampling circuit is connected with the output end of the control switch, and the output end of the second voltage sampling circuit is connected with the control circuit;
the input end of the control switch is the first end of the second test circuit, the control end of the control switch is the fourth end of the second test circuit, the output end of the control switch is the second end of the second test circuit, and the output end of the second voltage sampling circuit is the third end of the second test circuit.
Preferably, the second resistance sampling circuit includes: a first sampling resistor and a second sampling resistor;
the first end of the first sampling resistor is connected with the first output end of the control switch, the second end of the first sampling resistor is connected with the second end of the second sampling resistor, and the first end of the second sampling resistor is connected with the second output end of the control switch.
Implement the utility model discloses a low-voltage contactor detection device has following beneficial effect: the method comprises the following steps: the circuit comprises a control circuit, a switch driving circuit, an input source, an isolation circuit, a first test circuit and a second test circuit; the input end of the input source is connected with an alternating current source, the control end of the input source is connected with the control circuit, the first output end of the input source is connected with the input end of the isolation circuit, the second output end of the input source is connected with the first end of the second test circuit, the second end of the second test circuit is connected with the working coil of the contactor to be tested, the output end of the isolation circuit is connected with the first end of the first test circuit, the second end of the first test circuit is connected with the control circuit, and the test end of the first test circuit is connected with the main contact of the contactor to be tested; and the third end of the second test circuit is connected with the control circuit, and the third end of the first test circuit and the fourth end of the second test circuit are connected with the switch driving circuit. The detection device can detect the circuit and the performance of the contactor, can find the defects of the contactor in time and avoid the deterioration of the contactor.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a low-voltage contactor detection device according to an embodiment of the present invention;
fig. 2 and fig. 3 are circuit diagrams of a low-voltage contactor detection device provided by an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of an alternative embodiment of the present invention.
As shown in fig. 1, the low-voltage contactor detecting device includes: control circuit 17, switch drive circuit 16, input source 11, isolation circuit 12, first test circuit 13, and second test circuit 15.
The input end of an input source 11 is connected with an alternating current source, the control end of the input source 11 is connected with a control circuit 17, the first output end of the input source 11 is connected with the input end of an isolation circuit 12, the second output end of the input source is connected with the first end of a second test circuit 15, the second end of the second test circuit 15 is connected with a working coil of a contactor to be tested, the output end of the isolation circuit 12 is connected with the first end of a first test circuit 13, the second end of the first test circuit 13 is connected with the control circuit 17, and the test end of the first test circuit 13 is connected with a main contact of the contactor to be tested; the third terminal of the second test circuit 15 is connected to the control circuit 17, and the third terminal of the first test circuit 13 and the fourth terminal of the second test circuit 15 are connected to the switch driving circuit 16.
Further, in some embodiments, the input source 11 includes: a first voltage regulator and a second voltage regulator.
The input end of the first voltage regulator is connected with an alternating current source, the output end of the first voltage regulator is connected with the input end of the isolation circuit 12, and the control end of the first voltage regulator is connected with the control circuit 17; the input end of the second voltage regulator is connected with an alternating current source, and the output end of the second voltage regulator is connected with the first end of the second test circuit 15. The input end of the first voltage regulator and the input end of the second voltage regulator are input ends of the input source 11, the output end of the first voltage regulator and the output end of the second voltage regulator are output ends of the input source 11, and the control end of the first voltage regulator and the control end of the second voltage regulator are control ends of the input source 11.
Further, in some embodiments, as shown in fig. 1, the low-voltage contactor detecting device further includes: an input processing circuit 14 is arranged between the output of the second voltage regulator and the first terminal of the first test circuit 13.
Optionally, in some embodiments, the input processing circuit 14 includes: a rectifier bridge and a filter circuit.
The input end of the rectifier bridge is connected with the output end of the second voltage regulator, the output end of the rectifier bridge is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the first end of the second test circuit 15.
Further, in some embodiments, the isolation circuit 12 includes: an isolation transformer.
Optionally, in some embodiments, the first test circuit 13 includes: the device comprises a direct current source, a switching circuit, a current sampling circuit, a first voltage sampling circuit and a contact end connected with a main contact of a contactor to be tested.
The first end of the direct current source is connected with the second end of the switch circuit, the first end of the switch circuit is connected with the first output end of the isolation circuit 12, the control end of the switch circuit is connected with the switch driving circuit 16, the third end of the switch circuit is connected with the input terminal of the contact end, the sampling end of the first voltage sampling circuit is connected between the third end of the switch circuit and the input terminal of the contact end, the output end of the first voltage sampling circuit is connected with the control circuit 17, the second end of the direct current source and the output terminal of the contact end are connected with the second end of the current sampling circuit, the first end of the current sampling circuit is connected with the second output end of the isolation circuit 12, and the output end of the current sampling circuit is connected.
The first end of the switch circuit is the first end of the first test circuit 13, the contact end is the test end of the first test circuit 13, the control end of the switch circuit is the third end of the first test circuit 13, and the output end of the first voltage sampling circuit is the second end of the first test circuit 13.
Optionally, the current sampling circuit includes: a flow divider.
Further, in some embodiments, the contact end includes: a first sub-contact end, a second sub-contact end, a third sub-contact end; the first voltage sampling circuit includes: the device comprises a first sub-voltage sampling circuit, a second sub-voltage sampling circuit, a third sub-voltage sampling circuit and a linked switch;
the input end of the first sub-contact end, the input end of the second sub-contact end and the input end of the third sub-contact end are connected with the third end of the switch circuit, the sampling end of the first sub-voltage sampling circuit is connected between the input end of the first sub-contact end and the third end of the switch circuit, the sampling end of the second sub-voltage sampling circuit is connected between the input end of the second sub-contact end and the third end of the switch circuit, and the sampling end of the third sub-voltage sampling circuit is connected between the input end of the third sub-contact end and the third end of the switch circuit.
The ganged switch is arranged between the input end and the output end of the first voltage sampling circuit; the output end of the first sub-contact end, the output end of the second sub-contact end and the output end of the third sub-contact end are connected to the second end of the current sampling circuit and are grounded through the ganged switch.
Further, in some embodiments, the second test circuit 15 includes: a control switch and a second voltage sampling circuit.
The input end of the control switch is connected with the output end of the filter circuit, the output end of the control switch is connected with the working coil of the contactor to be tested, and the control end of the control switch is connected with the switch driving circuit 16; the input end of the second voltage sampling circuit is connected with the output end of the control switch, and the output end of the second voltage sampling circuit is connected with the control circuit 17.
The input end of the control switch is the first end of the second test circuit 15, the control end of the control switch is the fourth end of the second test circuit 15, the output end of the control switch is the second end of the second test circuit 15, and the output end of the second voltage sampling circuit is the third end of the second test circuit 15.
Further, in some embodiments, the second resistance sampling circuit comprises: a first sampling resistor and a second sampling resistor.
The first end of the first sampling resistor is connected with the first output end of the control switch, the second end of the first sampling resistor and the second end of the second sampling resistor are connected with the control circuit 17, and the first end of the second sampling resistor is connected with the second output end of the control switch.
Further, in some embodiments, the low-voltage contactor detection device may further include: and the display device is connected with the control unit and is used for outputting the detection information and the set parameters of the contactor to be detected. The detection information includes, but is not limited to, voltage information, current information, potential change information, resistance information, time information, and the like. Optionally, the display device includes a display screen, wherein the display screen includes, but is not limited to, an LCD display screen, an LED display screen, an OLED display screen, a flexible display screen, and the like.
The following description will be given with reference to a specific example.
As shown in fig. 2 and 3, in this embodiment, the control circuit 17 includes a PLC controller. The switch drive circuit 16 includes: KA1, KA2, KA3, KA4, KA5, KA7, KA8, KA9, KA10, and KA 11.
As shown in FIG. 2, a first end of KA1, a first end of KA2, a first end of KA3, a first end of KA4 and a first end of KA5 are each independently connected to the PLC controller, a second end of KA1, a second end of KA2, a second end of KA3, a second end of KA4 and a second end of KA5 are shorted and connected to +24V, and a first end of KA4-2 is connected between +24V and a second end of KA1, a second end of KA4-2 is connected to the first end of KA11, a second end of KA7 at the second end of KA11 is grounded, a first end of KA7 is connected to the second end of KA3-3, and a first end of KA3-3 is connected between the second end of KA1 and the second end of KA 2.
Further, as shown in FIG. 2, the first terminal of KA1-1, the first terminal of KA1-2, the first terminal of KA2-2, and the first terminal of KA3-1 are shorted and connected to the L-line of the AC source; the second end of the KA1-1 is connected with the first end of the KA2-1, the second end of the KA2-1 is connected with the first end of the KA8 and the control first end of the KM 1; the second terminal of KA8, the control second terminal of KM1, the second terminal of KA9, the control second terminal of KM2, the second terminal of KA10, the control second terminal of KM3 and the control second terminal of KM4 are shorted and connected to an N-line of an alternating current source. The second end of KA1-2 is connected to the first end of KA9 and the control first end of KM2, the second end of KA2-2 is connected to the first end of KA10 and the control first end of KM3, and the second end of KA3-1 is connected to the control first end of KM 4.
As shown in fig. 3, the first voltage regulator comprises a first adjustable transformer TY1 and the second voltage regulator comprises a second adjustable transformer TY 2. The isolation circuit 12 includes an isolation transformer BY 1. The direct current source comprises a direct current source DC, and the switching circuit comprises: KA4-4, KA4-3, KM4, KM1, KM2, KM 3; the input end of the first sub-contact end is a1, and the output end of the first sub-contact end is a 2; the input end of the second sub-contact end is b1, and the output end of the second sub-contact end is b 2; the input end of the third sub-contact terminal is c1, and the output end of the third sub-contact terminal is c 2. The shunt is shown at 2000A/75mV in FIG. 2. The first voltage sampling circuit includes: the ganged switches KA11 and X0 are output ends of the first sub-voltage sampling circuit, X1 is an output end of the second sub-voltage sampling circuit, and X3 is an output end of the third sub-voltage sampling circuit. And 1A + and 1A-are current sampling signals output by the current divider.
Further, as shown in fig. 3, the rectifier bridge is 3510 in fig. 3, and the filter circuit includes: a first capacitor C1, a second capacitor C2 and a filter resistor. The control switch includes: KA5-1 and KA 5-2; the second voltage sampling circuit includes: a first sampling resistor and a second sampling resistor. V + and V-are voltage sampling signals output by the second voltage sampling circuit.
As shown in fig. 3, a first input terminal of the first adjustable transformer TY1 is connected to the L line, a second input terminal of the first adjustable transformer TY1 is connected to the N line, and a first output terminal of the first adjustable transformer TY1 is connected to a first input terminal of the isolation transformer sequentially through KA4-2 and KA3-2, wherein a control terminal of the first adjustable transformer TY1 is not shown. A second input end of the isolation transformer BY1 is connected with a second output end of the first adjustable transformer TY1, a first output end of the isolation transformer BY1 is connected with the first end of the KM4, a second output end of the isolation transformer BY1 is connected with the first end of the shunt, and a sampling output end of the shunt is connected to the PLC controller. The second end of KM4 is connected to the first end of KM1, and the second end of KM4 is further connected to the second end of KA4-4 and the second end of KA4-3, the first ends of KA4-4 and KA4-3 are connected to the first end of DC source, and the second end of DC source is connected to A2, B2 and C2 and to the second end of the shunt. The second end of KM1 was linked to c1, the first end of KM2 and the first end of KM3 were linked to the second end of KM4, the second end of KM2 was linked to b1, and the second end of KM3 was linked to a 1. The first end of the linkage switch KA11 is connected between the second ends of a1 and KM3, the second end of the linkage switch KA11 is connected between the second ends of b1 and KM2, the third end of the linkage switch KA11 is connected between the second ends of c1 and KM1, the fourth end of the linkage switch KA11 is short-circuited with a2, b2 and c2, the fifth end of the linkage switch KA11 is grounded, the sixth end of the linkage switch KA11 outputs X3, the seventh end of the linkage switch KA11 outputs X1, and the eighth end of the linkage switch KA11 outputs X0.
A first input end of a second adjustable transformer TY2 is connected with an L line, a second input end of the second adjustable transformer TY2 is connected with an N line, a control end of the second adjustable transformer TY2 is not shown, a first output end of the second adjustable transformer TY2 is connected with a positive input end of a rectifier bridge, a second output end of the second adjustable transformer TY2 is connected with a negative input end of the rectifier bridge, a positive output end of the rectifier bridge is connected with a first end of KA5-1, and a negative output end of the rectifier bridge is connected with a first end of KA 5-2. The first capacitor C1, the second capacitor C2 and the filter resistor are connected in parallel in sequence and then connected between the positive output end and the negative output end of the rectifier bridge. The second end of the KA5-1 is connected with the anode of the working coil of the contactor to be tested, and the second end of the KA5-2 is connected with the cathode of the working coil of the contactor to be tested.
The first end of the first sampling resistor is connected with the second end of the KA5-1, and the second end of the first sampling resistor outputs V +; the first end of the second sampling resistor is connected with the second end of the KA5-2, and the second end of the second sampling resistor outputs V-.
Specifically, through adopting the utility model discloses low voltage contactor detection device can carry out following test to the contactor that awaits measuring:
(1) three-phase synchronization test:
under the condition of confirming power failure, main contacts (three-phase input ends and output ends) of a contactor to be tested are respectively connected with a1/a2, b1/b2 and c1/c2, and working coils of the contactor to be tested are correspondingly connected to the second end of the KA5-1 and the second end of the KA5-2 according to the positive and negative poles. After the wiring is confirmed to be correct, the power is switched on. After starting up, selecting 'contact synchronism' on the control interface of the display device, and setting the direct-current voltage of the device as the rated voltage of the coil. When a start button on a display device is pressed, a Direct Current (DC) source in the low-voltage contactor detection device outputs and starts timing, a Programmable Logic Controller (PLC) controls a corresponding switch to enable a contactor to be tested to execute an attraction action, and the low-voltage contactor detection device stops timing after detecting that a three-phase loop is connected respectively and displays the three-phase closing time on a display screen. And judging whether the synchronous switching-on function of the three-phase contact of the contactor to be tested is normal or not according to the switching-on time.
Wherein, the closing time can be determined by the time length of the potential change output by X0, X1 and X3. In a specific example, a large-capacity low-voltage contactor of an LC 1F 150 type is used as a sample for testing, the synchronous closing function of three-phase contacts of the contactor is normal, and the closing time is about 52 ms.
(2) And (3) testing the contact resistance of the three-phase contact:
the detection device calculates the contact resistance of the three-phase contact through a direct current voltage measurement method. The method specifically comprises the following steps: the method comprises the steps of maintaining connecting lines of three phase lines and coils of a contactor to be tested, connecting voltage drop signals to main contacts (three-phase input ends and output ends) of the contactor to be tested, namely accessing a1/a2, b1/b2 and c1/c2, switching an interface in a display device to a contact resistance interface, setting contact current according to the capacity of the contactor to be tested, confirming normal wiring, clicking a starting button, starting a direct resistance test, and displaying three-phase contact resistance on a display screen after the test is completed, wherein the three-phase contact resistance is also converted through signals output by X0, X1 and X0 to a PLC controller according to signals output by X0, X1 and X0 to obtain corresponding contact resistance values and output the contact resistance values to the display device for displaying.
Among them, in one example, a faulty contactor having an excessively large contact resistance (close to 1k Ω) may be used as a test sample. Tests and verification carried out on the device show that the contact resistance of the contactor AB is normal and is 4.301m omega and 13.638m omega respectively, and the contact resistance of the contactor C shows the overrange of 99.999m omega.
(III) contactor coil shunt voltage test
The device continuously adjusts the direct current voltage applied to two poles of the working coil of the contactor to be tested through the PLC, and the monitoring voltage is introduced into the three-phase main loop, and the corresponding voltage value is recorded and displayed when the contact of the contactor to be tested is attracted and disconnected. And maintaining the connecting wires of the three-phase wire and the coil of the contactor to be tested, switching the interface of the display device to an action voltage interface, confirming that the connecting wires are normal, clicking a start button to start a coil voltage lifting test, and displaying the opening and closing voltage value of the coil on a display screen after the test is finished.
The method comprises the steps of judging whether a contactor to be tested is in attraction and disconnection or not through potential changes of X0, X1 and X3, respectively detecting V & lt + & gt and V & lt- & gt in attraction and V & lt- & gt in disconnection by a PLC (programmable logic controller) when the contactor to be tested is in attraction and disconnection, and outputting the V & lt- & gt and V & lt- & gt in disconnection to a display device for displaying.
In one specific example, the large-capacity contactor test of the LC 1150F type can be adopted to show that the voltage-boosting contactor automatically pulls in the 46.9VDC coil and the voltage-losing contactor opens in the 20.7VDC coil.
(4) Detecting the three-phase through-current breaking waveform of the contactor:
the device can perform through-current test by manually selecting any one of three phases or automatically switching the three phases. The current size of 0-2000A can be freely selected, and the coil voltage value of 0-130VDC can be freely set. And continuously introducing three-phase current, and recording the current waveform condition at the moment (within 100 ms) when the contact of the contactor is disconnected from the moment when the coil loses power. The wiring method is the same as above. The current waveform can be fed back to the PLC through current sampling signals (1A + and 1A-) output by the current divider, and the current waveform is converted into a corresponding current waveform by the PLC and output to the display device for display.
In one embodiment, a sample LC 1F 150 type high capacity contactor (In 150A) may be used, and tests show a three-phase open current waveform with its own arc chute, which is capable of rapidly switching off the current within 40ms during opening, with nearly 10 times the In 1400A current.
(5) Testing the service life of the contactor:
the function of the device can be set manually by simulating the operating state of the working condition on site, the current value of any one phase is set randomly, and the aging test is accelerated by setting the opening and closing time interval (setting the opening and closing of KA 5), frequently opening and closing (frequently opening and closing for KA 5).
And in the process of frequent switching-on and switching-off tests, if the conduction failure of the contact is detected, the test is stopped and fault information is displayed.
Carrying out fault simulation test on the sample contactor: specifically, parameter setting is firstly carried out, and a test is started; then simulating the contact adhesion of the loop 1, and automatically stopping the operation and reporting the fault after the device detects that the contact cannot be disconnected; and the contact of the analog loop 1 is open, the conduction of the contact cannot be detected, and the automatic shutdown is used for reporting faults.
The device can detect whether the functions and technical parameters of the contactor are normal or not, has a remarkable effect on abnormal fault analysis of the coil and the contact inside the contactor, finds the bad state of the contactor in advance, and avoids further deterioration to cause the field equipment to be unavailable. The method can also be used for analyzing the aging of the contactor and researching the service life conditions of all parts of the contactor.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention. It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A low-voltage contactor testing apparatus, comprising: the circuit comprises a control circuit, a switch driving circuit, an input source, an isolation circuit, a first test circuit and a second test circuit;
the input end of the input source is connected with an alternating current source, the control end of the input source is connected with a control circuit, the first output end of the input source is connected with the input end of the isolation circuit, the second output end of the input source is connected with the first end of the second test circuit, the second end of the second test circuit is connected with a working coil of a contactor to be tested, the output end of the isolation circuit is connected with the first end of the first test circuit, the second end of the first test circuit is connected with the control circuit, and the test end of the first test circuit is connected with a main contact of the contactor to be tested; and the third end of the second test circuit is connected with the control circuit, and the third end of the first test circuit and the fourth end of the second test circuit are connected with the switch driving circuit.
2. The low-voltage contactor detection device according to claim 1, wherein said input source comprises: a first voltage regulator and a second voltage regulator;
the input end of the first voltage regulator is connected with the alternating current source, the output end of the first voltage regulator is connected with the input end of the isolation circuit, and the control end of the first voltage regulator is connected with the control circuit;
the input end of the second voltage regulator is connected with the alternating current source, and the output end of the second voltage regulator is connected with the first end of the second test circuit;
the input of first voltage regulator with the input of second voltage regulator does the input of input source, the output of first voltage regulator with the output of second voltage regulator does the output of input source, the control end of first voltage regulator with the control end of second voltage regulator does the control end of input source.
3. The low-voltage contactor detection device according to claim 2, further comprising: and the input processing circuit is arranged between the output end of the second voltage regulator and the first end of the first test circuit.
4. A low-voltage contactor detection device according to claim 3, characterized in that said input processing circuit comprises: a rectifier bridge and a filter circuit;
the input of rectifier bridge is connected the output of second voltage regulator, the output of rectifier bridge is connected filter circuit's input, filter circuit's output is connected second test circuit's first end.
5. A low-voltage contactor detection device according to claim 1, characterized in that said isolation circuit comprises: an isolation transformer.
6. A low-voltage contactor detection device according to claim 1, characterized in that said first test circuit comprises: the device comprises a direct current source, a switching circuit, a current sampling circuit, a first voltage sampling circuit and a contact end connected with a main contact of the contactor to be tested;
the first end of the direct current source is connected with the second end of the switch circuit, the first end of the switch circuit is connected with the first output end of the isolation circuit, the control end of the switch circuit is connected with the switch driving circuit, the third end of the switch circuit is connected with the input terminal of the contact end, the sampling end of the first voltage sampling circuit is connected between the third end of the switch circuit and the input terminal of the contact end, the output end of the first voltage sampling circuit is connected with the control circuit, the second end of the direct current source and the output terminal of the contact end are connected with the second end of the current sampling circuit, the first end of the current sampling circuit is connected with the second output end of the isolation circuit, and the output end of the current sampling circuit is connected with the control circuit;
the first end of the switch circuit is the first end of the first test circuit, the contact end is the test end of the first test circuit, the control end of the switch circuit is the third end of the first test circuit, and the output end of the first voltage sampling circuit is the second end of the first test circuit.
7. The low-voltage contactor detection device according to claim 6, wherein said current sampling circuit comprises: a flow divider.
8. The low-voltage contactor detection device according to claim 6, characterized in that said contact end comprises: a first sub-contact end, a second sub-contact end, a third sub-contact end; the first voltage sampling circuit includes: the device comprises a first sub-voltage sampling circuit, a second sub-voltage sampling circuit, a third sub-voltage sampling circuit and a linked switch;
the input end of the first sub-contact end, the input end of the second sub-contact end and the input end of the third sub-contact end are connected with the third end of the switch circuit, the sampling end of the first sub-voltage sampling circuit is connected between the input end of the first sub-contact end and the third end of the switch circuit, the sampling end of the second sub-voltage sampling circuit is connected between the input end of the second sub-contact end and the third end of the switch circuit, and the sampling end of the third sub-voltage sampling circuit is connected between the input end of the third sub-contact end and the third end of the switch circuit;
the ganged switch is arranged between the input end and the output end of the first voltage sampling circuit; the output end of the first sub-contact end, the output end of the second sub-contact end and the output end of the third sub-contact end are connected to the second end of the current sampling circuit, and the output end of the first sub-contact end, the output end of the second sub-contact end and the output end of the third sub-contact end are grounded through the ganged switch.
9. A low-voltage contactor detection device according to claim 4, characterized in that said second test circuit comprises: the control switch and the second voltage sampling circuit;
the input end of the control switch is connected with the output end of the filter circuit, the output end of the control switch is connected with the working coil of the contactor to be tested, and the control end of the control switch is connected with the switch driving circuit;
the input end of the second voltage sampling circuit is connected with the output end of the control switch, and the output end of the second voltage sampling circuit is connected with the control circuit;
the input end of the control switch is the first end of the second test circuit, the control end of the control switch is the fourth end of the second test circuit, the output end of the control switch is the second end of the second test circuit, and the output end of the second voltage sampling circuit is the third end of the second test circuit.
10. The low-voltage contactor detection device according to claim 9, wherein said second voltage sampling circuit comprises: a first sampling resistor and a second sampling resistor;
the first end of the first sampling resistor is connected with the first output end of the control switch, the second end of the first sampling resistor is connected with the second end of the second sampling resistor, and the first end of the second sampling resistor is connected with the second output end of the control switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022198874.6U CN213302454U (en) | 2020-09-29 | 2020-09-29 | Low-voltage contactor detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022198874.6U CN213302454U (en) | 2020-09-29 | 2020-09-29 | Low-voltage contactor detection device |
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| Publication Number | Publication Date |
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| CN213302454U true CN213302454U (en) | 2021-05-28 |
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| CN202022198874.6U Active CN213302454U (en) | 2020-09-29 | 2020-09-29 | Low-voltage contactor detection device |
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| CN (1) | CN213302454U (en) |
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