CN109030987B - Test device and test method for simulating motor load - Google Patents
Test device and test method for simulating motor load Download PDFInfo
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- CN109030987B CN109030987B CN201810617388.8A CN201810617388A CN109030987B CN 109030987 B CN109030987 B CN 109030987B CN 201810617388 A CN201810617388 A CN 201810617388A CN 109030987 B CN109030987 B CN 109030987B
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Abstract
The invention discloses a test device and a test method for simulating motor load, wherein the device comprises a signal acquisition circuit for acquiring the voltage of a tested contactor coil, a control system for outputting a control signal to control the work of a subsequent circuit according to the signal input by the signal acquisition circuit, a load circuit for simulating alternating current and direct current motor loads, and a control circuit for controlling the work state of the tested contactor coil. The device provided by the invention simulates the motor, can be used as the load of the tested contactor, does not need to purchase the motor, and reduces the enterprise cost. In addition, the device provided by the application can be simulated into different types of motors according to actual conditions so as to meet different types of contactor tests.
Description
Technical Field
The invention relates to a test device, in particular to a motor load simulation test device for simulating loads of an alternating current motor and a direct current motor and testing whether a tested contactor normally works.
The invention further relates to a test method, in particular to a test method for simulating the load of the motor.
Background
Contactors are devices that can rapidly disconnect a main ac or dc circuit and frequently connect the circuit with a high current control (up to 800 amps in some types). The electric motor is one of the most operated control objects, and furthermore, the contactor can be used as an electric load for controlling plant equipment, electric heaters, machine tools, various electric power units, and the like. The contactor not only can switch on and off a circuit, but also has a low-voltage release protection function, has large control capacity, and is one of important elements in an automatic control system, and is suitable for frequent operation and remote control.
The working principle of the contactor is as follows: when the coil of the contactor is electrified, the current of the coil can generate a magnetic field, the generated magnetic field enables the static iron core to generate electromagnetic attraction to attract the movable iron core and drive the alternating current contactor to act, the normally closed contact is opened, the normally open contact is closed, and the normally closed contact and the normally open contact are linked. When the coil is powered off, the electromagnetic attraction disappears, the armature is released under the action of the release spring, the contact is restored, the normally open contact is disconnected, and the normally closed contact is closed.
In the production and test processes of the contactor, some contactor products need to be subjected to a service life test. The existing contactors are various in types and different in load size, and motors of different specifications are required to be tested, so that the test cost is high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a simulation motor load test device capable of simulating loads of an alternating current motor and a direct current motor, which can simulate the loads of the motor to carry out a test.
The invention herein has a second object. A second object of the invention is to provide a test method for simulating motor loads.
The present application provides a simulated motor load test apparatus, the apparatus comprising:
the signal acquisition circuit is used for acquiring the voltage of a coil of the tested contactor to be switched on and switched off;
the control system is used for outputting a control signal to control a subsequent circuit to work according to the signal input by the signal acquisition single circuit;
a load circuit for simulating a motor load;
the control circuit is used for controlling the working state of the coil of the tested contactor;
the output of the signal acquisition circuit is input into the control system, the control system outputs a control signal to control the load circuit and the control circuit to work, and the load simulation of the motor is realized by controlling the mode of the load circuit.
Specifically, the signal acquisition circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a triode Q2; one end of the resistor R2 is connected with one end of the resistor R3, the other end of the resistor R2 is connected with the control circuit as the connecting end of the signal acquisition circuit, and the other end of the resistor R3 is grounded; the resistor R1 is connected in series with one end of the triode Q2, which is connected with the resistor R2 and the resistor R3 at the base, the collector of the triode Q2 is connected with a power supply through a resistor R4, and the emitter is grounded; the collector of the transistor Q2 is connected to the control system.
Specifically, the load circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R10, a resistor R11, a transistor Q1, a transistor Q3, a contactor RL1, a contactor RL2, a light-emitting diode D1 and a light-emitting diode D2; the base electrode of the triode Q1 is connected to the control system through the resistor R5, the emitter electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is grounded through the coil of the contactor RL 2; the normally open contact of the contactor RL2 is a power supply end, the stationary contact of the contactor RL2 is connected with the stationary contact of the contactor RL1 and serves as one connection end of a load circuit, and the stationary contact of the contactor RL2 is grounded through a resistor R10 and a light-emitting diode D1 in sequence; the base electrode of the triode Q3 is connected to the control system through the resistor R7, the emitter electrode of the triode Q3 is grounded, and the collector electrode of the triode Q3 is grounded through the coil of the contactor RL 1; the normally open contact of the contactor RL1 is connected with a power supply through the resistor R8, and the static contact of the contactor RL1 is also connected with the ground through the resistor R11 and the light-emitting diode D2 in sequence; one end of the resistor R6 is grounded, and the other end of the resistor R6 is used as the other connecting end of the circuit of the load.
Specifically, the resistor R6 and the resistor R8 are adjustable resistors.
Specifically, the control circuit comprises a resistor R9, a triode Q4 and a contactor RL4, wherein the base electrode of the triode Q4 is connected to the control system through a resistor R9, the emitter electrode of the triode Q4 is connected with a power supply, and the collector electrode of the triode Q4 is grounded through a coil of the contactor RL 4; and a static contact of the contactor RL4 is connected with an emitter of the triode Q4, and a normally open contact and a normally closed contact of the contactor RL4 are respectively used as connection ends of a control circuit.
Specifically, the control system is composed of a single chip microcomputer.
Specifically, the control system further comprises a switch K1 and a switch K2, one end of the switch K1 and one end of the switch K2 are connected to the single chip microcomputer respectively, and the other end of the switch K1 and the other end of the switch K2 are grounded.
The test method for simulating the motor load provided by the invention comprises the following steps:
step 1: connecting a coil 1 and a coil 2 of the contactor to be tested with a normally closed contact and a normally open contact of a control circuit respectively, and connecting a static contact and a normally open contact of the contactor to be tested with a connecting end of a load circuit respectively;
step 2: the loading power supply loads the load power supply on the load circuit; loading a voltage which enables the voltage collected by the signal collecting circuit to be 2-4V on a normally closed contact of the control circuit;
and step 3: the signal acquisition circuit outputs a control signal to the control system, and the control system starts timing;
and 4, step 4: judging whether the control system times to Ams, if so, controlling the contactor of the load to act, and continuing to execute the step 5; otherwise, the control system continues timing and repeatedly executes the step 4;
and 5: the control system outputs a control signal to enable the control circuit to output a signal to enable a coil 2 of the contactor to be tested to load a power supply, so that a normally open contact of the contactor to be tested is closed; controlling the current generated Bms in the system load circuit;
step 6: judging whether the control system times to Bms, if so, executing the step 7; otherwise, the control system continues timing and repeatedly executes the step 6;
and 7: the control system outputs a control signal to close one load circuit and continuously enables the current in the other load circuit to continue to Cms;
and 8: judging whether the control system times to Cms, if so, executing step 9; otherwise, the control system continues timing and repeatedly executes the step 8;
and step 9: the control system outputs a control signal to break a normally open contact of the contactor to be tested, and no current is generated in a load circuit;
step 10: judging whether the control system times to Ds or Fs, if yes, repeating the steps 1-9, and repeating the test;
wherein the relationship among Ams, Bms and Cms is: a < B < C <300ms, the relationship between Ds or Fs is D < F <15 s.
Specifically, the Ams, the Bms and the Cms are respectively 30ms, 70ms and 280 ms; d is 2s and F is 10 s.
The invention has the beneficial effects that: the device that this application provided has simulated the motor, can regard as the load by experimental contactor, need not purchase the motor, has reduced the cost in business. In addition, the device provided by the application can be simulated into different types of motors according to actual conditions so as to meet different types of contactor tests.
The test method provided by the application effectively simulates the working state of the motor load, and the test device provided by the application can be used for simulating different types of motors so as to meet the test of the contactor and reduce the enterprise cost.
Drawings
FIG. 1 is a schematic structural view of a testing apparatus of the apparatus provided by the present invention;
FIG. 2 is a flow chart of the test method provided by the present invention.
Detailed Description
The technical solutions claimed in the present application will be described in further detail herein with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the testing device claimed herein includes a signal acquisition circuit for acquiring the voltage of the coil of the tested contactor, a control system for outputting a control signal to control the operation of the subsequent circuit according to the signal input by the signal acquisition circuit, a load circuit for simulating the load of the ac and dc motors, and a control circuit for controlling the operating state of the coil of the tested contactor. In order to explain the claimed technical solution in more detail, specific circuit structures of the signal acquisition circuit, the control system, the load circuit and the control circuit are provided herein. However, the specific circuit structure provided herein is only one of the technical solutions for implementing the present invention, and does not mean that the signal acquisition circuit, the control system, the load circuit, and the control circuit described in the present application can only be implemented by the specific circuit structure provided herein, and any existing circuit structure capable of implementing the corresponding function can also be used.
The signal acquisition circuit provided by the application comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a triode Q2; the load circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R10, a resistor R11, a triode Q1, a triode Q3, a contactor RL1, a contactor RL2, a light-emitting diode D1 and a light-emitting diode D2; the control system is composed of a singlechip, and specifically comprises a singlechip AT89C51, a reset switch K3, an electrolytic capacitor C1, a resistor R12, a capacitor C2, a capacitor C3 and a crystal oscillator X1; the control circuit comprises a resistor R9, a transistor Q4 and a contactor RL 4.
The connection relation among the components is as follows: one end of the resistor R2 is connected with one end of the resistor R3, the other end of the resistor R2 is connected with the normally closed contact of the contactor RL4 as the connecting end of the signal acquisition circuit, and the other end of the resistor R3 is grounded; the resistor R1 is connected in series with one end of the base of the triode Q2 connected with the resistor R2 and the resistor R3, the collector of the triode Q2 is connected with the power supply through the resistor R4, and the emitter is grounded; the collector of the triode Q2 is connected to the pin 17 of the single chip microcomputer AT89C51, and when the triode Q2 is conducted, the voltage of the pin 17 is pulled down, so that the low level is input; when transistor Q2 is off, pin 17 inputs a high. A pin 16 of the single chip microcomputer AT89C51 is connected to a base electrode of a triode Q1 through a resistor R5, an emitting electrode of the triode Q1 is grounded, and a collecting electrode is grounded through a coil of a contactor RL 2; the normally open contact of the contactor RL2 is connected with a power supply, and the stationary contact of the contactor RL2 is connected with the stationary contact of the contactor RL1 and is used as one connection end A of a load circuit; the stationary contact of the contactor RL2 is also grounded via the resistor R10 and the light emitting diode D1 in this order, and the stationary contact of the contactor RL1 is grounded via the resistor R11 and the light emitting diode D2 in this order. The normally open contact of the contactor RL1 is connected with a power supply through a resistor R8, one end of a coil of the contactor RL1 is grounded, the other end of the coil is connected with a collector of a triode Q3, an emitter of the triode Q3 is connected with the power supply, and a base of the triode Q3 is connected with a pin 23 of AT89C51 through a resistor R7.
One end of the resistor R6 is connected to ground, and the other end serves as the other connection B of the load circuit. The base electrode of the triode Q4 is connected to a pin 8 of the single chip microcomputer AT89C51 through a resistor R9, the emitter electrode of the triode Q4 is connected with a power supply, the collector electrode of the triode Q4 is grounded through a coil of a contactor RL4, a static contact of a contactor RL4 is connected with the emitter electrode, and a normally open contact and a normally closed contact of a contactor RL4 are respectively used as a connecting end C and a connecting end D. And the connecting end A, the connecting end B, the connecting end C and the connecting end D are used as the connecting ends of the whole device and are used for connecting the tested contactor RL 3.
The reset switch K3, the electrolytic capacitor C1 and the resistor R12 form a reset circuit of the single chip microcomputer AT89C51, the electrolytic capacitor C1 and the resistor R12 are connected between a power supply and the ground in series, the reset switch K3 is connected to two ends of the electrolytic capacitor C1 in parallel, and the negative electrode of the electrolytic capacitor C1 is connected to a reset pin (pin 9) of the single chip microcomputer AT89C 51; the capacitor C2, the capacitor C3 and the crystal oscillator X1 form a clock circuit of the single chip microcomputer AT89C51, the crystal oscillator X is connected in series between clock pins 18 and 19 of the single chip microcomputer AT89C51, the capacitor C2 is connected in series between the clock pin 19 and the ground, and the capacitor C3 is connected in series between the clock pin 18 and the ground.
In addition, in order to enable the testing device provided by the application to simulate various types of motors, the resistor R6 and the resistor R8 are adjustable resistors, and the current in a load circuit can be changed by changing the resistance values of the resistor R6 and the resistor R8; of course, various types of motors can be simulated by changing the size of the load power supply. The resistor R6, the resistor R8 and the load power supply select different resistance values and different voltage values according to the load current of different products.
The invention can simulate the AC and DC motor load test of the contactor, has high accuracy of controlling the surge current time, and can carry out the motor load test of GJB1461A specified relays of 1, 2, 3 and 4 types. When the test is carried out, the motor load test can be carried out strictly according to the requirements, the condition that current is conducted after the contact of the tested contactor is connected can be avoided, and the contact of the tested contactor is guaranteed to be subjected to impact current when the contact of the tested contactor is connected.
In addition, this application control system still includes switch K1 and switch K2, and switch K1's one end and switch K2's one end are connected to the singlechip respectively, and switch K1's the other end and switch K2's the other end ground connection. By selecting and pressing the switch K1 or the key of the switch K2, different programs are selected to perform different relay type tests, when the switch K1 is pressed, the relay load tests of types 1, 2 and 4 are performed, and when the switch K1 is disconnected, the switch K2 is pressed, the relay load test of type 3 is performed.
As shown in fig. 2, the test method for simulating the motor load provided by the present application includes the following steps:
step 1: connecting a coil 1 and a coil 2 of the contactor to be tested with a normally closed contact and a normally open contact of a control circuit respectively, and connecting a static contact and a normally open contact of the contactor to be tested with a connecting end of a load circuit respectively;
step 2: the loading power supply loads the load power supply on the load circuit; loading a voltage which enables the voltage collected by the signal collecting circuit to be 2-4V on a normally closed contact of the control circuit;
and step 3: the signal acquisition circuit outputs a control signal to the control system, and the control system starts timing;
and 4, step 4: judging whether the control system times to Ams, if so, executing the step 5; otherwise, the control system continues timing and repeatedly executes the step 4;
and 5: the control system outputs a control signal to enable the control circuit to output a signal to enable a coil 2 of the contactor to be tested to load a power supply, so that a normally open contact of the contactor to be tested is closed; the control system outputs a control signal at the moment to enable the load circuit to generate current;
step 6: judging whether the control system times to Bms, if so, executing the step 7; otherwise, the control system continues timing and repeatedly executes the step 6;
and 7: the control system outputs a control signal to enable the load circuit to generate current of 10-50A;
and 8: judging whether the control system times to Cms, if so, executing step 9; otherwise, the control system continues timing and repeatedly executes the step 8;
and step 9: the control system outputs a control signal to break a normally open contact of the contactor to be tested, and no current is generated in a load circuit; completing the test;
step 10: and judging whether the control system counts Ds or Fs (one type is determined according to the product types 1, 2 and 4, and the other type is determined according to the type 3), if yes, repeating the steps 1-9, and repeating the test.
Wherein the relationship among Ams, Bms and Cms is: a < B < C <300ms, the relationship between Ds or Fs is D < F <15 s. The specific Ams, Bms and Cms are respectively 30ms, 70ms and 280 ms; d is 2s and F is 10 s. The current in the step 5 and the step 7 is determined by adjusting R6, R8 and load power supply voltage according to the rated load of the tested product.
The contactor RL3 to be tested is connected to the test device provided in the present application, and the working process of the test method provided in the present application is described in detail. The contactor RL3 to be tested was connected to the test apparatus provided in the present application according to the following connection relationship:
a normally open contact of the contactor RL3 is connected with the connection end A, and a static contact is connected with the connection end B; coil 1 of contact RL3 is connected to connection end D, and coil 2 of contact RL3 is connected to connection end C.
After the connection is completed, the normal open contact ends of the contactor RL2 and the contactor RL1 are connected with the rated alternating current or direct current load power supply of a product, and the coil 1 of the contactor RL3 is connected with the power supply (the connected power supply can not make the contactor RL3 operate, namely the contactor RL3 is still in an open state at the moment). After a power supply is connected to a coil 1 of the contactor RL3, voltage is generated AT two ends of a resistor R3 to enable a triode Q2 to be conducted, a pin 17 of a singlechip AT89C51 inputs low level, AT the moment, the singlechip AT89C51 starts timing and enables a pin 16 to output low level to enable a triode Q1 to be conducted, current is introduced into a coil of a contactor RL2, the RL2 is enabled to be in a pull-in state, a light emitting diode D1 emits light, and the RL2 is indicated to be in the pull-in state. When the single chip microcomputer AT89C51 counts time for 30ms, the pin 8 and the pin 23 of the single chip microcomputer AT89C51 output low levels to respectively conduct the triode Q4 and the triode Q3, and AT the moment, the single chip microcomputer AT89C51 continues to count time. When the triode Q4 is turned on, the coil 2 of the contactor RL2 is turned on, the contactor RL3 is in a pull-in state, AT this time, since the triode Q3 is turned on, the light emitting diode D2 emits light to indicate that the contactor RL1 is in a conducting state, but the resistor R8 is short-circuited by the RL2 contact, AT this time, the load of the testing device is the resistor R6, the load power is loaded on the resistor R6, AT this time, the current is large, when the single chip AT89C51 times for 70ms, the pin 16 of the single chip AT89C51 outputs a high level and keeps timing, the high level output by the pin 16 cuts off the triode Q1, AT this time, the load of the testing device is the resistor R6 and the resistor R8 which are connected in series, the load power is loaded on the resistor R6 and the resistor R8, and AT this. And after the duration of a period of time, when the continuous timing of the single chip microcomputer AT89C51 reaches 280ms, the pin 8 and the pin 23 of the single chip microcomputer AT89C51 output high levels to respectively cut off the triode Q4 and the triode Q3, the coil 2 of the contactor RL3 is powered off, and the movable contact of the contactor RL4 is connected with the connecting end D, so that the test of the tested contactor is completed.
The testing device provided by the application simulates the working principle of the motor from the initial large current to the subsequent stable small current, because the large current is generated when the motor works and starts, the small current smaller than the current when the motor starts is generated along with the continuous working of the motor, and the motor also keeps the small current working mode in the subsequent working, the current is changed from large to small and is stable through the difference of the access time of the resistor R6 and the resistor R8, and the working mode of the motor is simulated. In addition, the light emitting diode plays a role in indicating, which indicates that current is actually generated in the load circuit and can indicate that the current is continuously stable from large to small, namely, the light emitting diode D1 and the light emitting diode D2 emit light at large current and only the light emitting diode D2 emits light at small current.
Therefore, whether the tested contactor can work normally or not can be effectively tested by using the testing device provided by the application, and the testing purpose is achieved.
The above embodiments are only for illustrating the technical solutions of the present invention and are not limited, and modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention are included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A simulation motor load test device which is characterized in that: the device includes:
the signal acquisition circuit is used for acquiring the voltage of a coil of the tested contactor to be switched on and switched off;
the control system is used for outputting a control signal according to the signal input by the signal acquisition circuit to control the subsequent circuit to work;
a load circuit for simulating a motor load;
the control circuit is used for controlling the working state of the coil of the tested contactor;
the output of the signal acquisition circuit is input into the control system, the control system outputs a control signal to control the load circuit and the control circuit to work, and the simulation of the motor load is realized by controlling the mode of the load circuit;
the signal acquisition circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a triode Q2; one end of the resistor R2 is connected with one end of the resistor R3, the other end of the resistor R2 is connected with the control circuit as the connecting end of the signal acquisition circuit, and the other end of the resistor R3 is grounded; the resistor R1 is connected in series with one end of the triode Q2, which is connected with the resistor R2 and the resistor R3 at the base, the collector of the triode Q2 is connected with a power supply through a resistor R4, and the emitter is grounded; the collector of the triode Q2 is connected to the control system;
the load circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R10, a resistor R11, a triode Q1, a triode Q3, a contactor RL1, a contactor RL2, a light-emitting diode D1 and a light-emitting diode D2; the base electrode of the triode Q1 is connected to the control system through the resistor R5, the emitter electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is grounded through the coil of the contactor RL 2; the normally open contact of the contactor RL2 is a power supply end, the stationary contact of the contactor RL2 is connected with the stationary contact of the contactor RL1 and serves as one connection end of a load circuit, and the stationary contact of the contactor RL2 is grounded through a resistor R10 and a light-emitting diode D1 in sequence; the base electrode of the triode Q3 is connected to the control system through the resistor R7, the emitter electrode of the triode Q3 is grounded, and the collector electrode of the triode Q3 is grounded through the coil of the contactor RL 1; the normally open contact of the contactor RL1 is connected with a power supply through the resistor R8, and the static contact of the contactor RL1 is also connected with the ground through the resistor R11 and the light-emitting diode D2 in sequence; one end of the resistor R6 is grounded, and the other end of the resistor R6 is used as the other connecting end of the circuit of the load; the resistor R6 and the resistor R8 are adjustable resistors;
the control circuit comprises a resistor R9, a triode Q4 and a contactor RL4, wherein the base electrode of the triode Q4 is connected to the control system through a resistor R9, the emitter electrode of the triode Q4 is connected with a power supply, and the collector electrode of the triode Q4 is grounded through a coil of the contactor RL 4; and a static contact of the contactor RL4 is connected with an emitter of the triode Q4, and a normally open contact and a normally closed contact of the contactor RL4 are respectively used as connection ends of a control circuit.
2. A simulated motor load test apparatus as claimed in claim 1, wherein: the control system is composed of a single chip microcomputer.
3. A simulated motor load test apparatus as claimed in claim 2, wherein: the control system further comprises a switch K1 and a switch K2, one end of the switch K1 and one end of the switch K2 are connected to the single chip microcomputer respectively, and the other end of the switch K1 and the other end of the switch K2 are grounded.
4. A test method for simulating a motor load using the simulated motor load test apparatus according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
step 1: connecting a coil 1 and a coil 2 of the contactor to be tested with a normally closed contact and a normally open contact of a control circuit respectively, and connecting the normally open contact of the contactor to be tested with a connecting end of a load circuit respectively;
step 2: the loading power supply loads the load power supply on the load circuit; loading a switching-off signal on a normally closed contact of the control circuit, and acquiring the voltage of 2-4V by the acquisition circuit when the switching-off signal is input;
and step 3: the signal acquisition circuit outputs a control signal to the control system, and the control system starts timing;
and 4, step 4: judging whether the control system times to Ams, if so, controlling the contactor of the load to act, and continuing to execute the step 5; otherwise, the control system continues timing and repeatedly executes the step 4;
and 5: the control system outputs a control signal to enable the control circuit to output a signal to enable a coil 2 of the contactor to be tested to load a power supply, so that a normally open contact of the contactor to be tested is closed; controlling the current generated Bms in the system load circuit;
step 6: judging whether the control system times to Bms, if so, executing the step 7; otherwise, the control system continues timing and repeatedly executes the step 6;
and 7: the control system outputs a control signal to close one load circuit and continuously enables the current in the other load circuit to continue to Cms;
and 8: judging whether the control system times to Cms, if so, executing step 9; otherwise, the control system continues timing and repeatedly executes the step 8;
and step 9: the control system outputs a control signal to break a normally open contact of the contactor to be tested, and no current is generated in a load circuit; step 10: judging whether the control system times to Ds or Fs, if yes, repeating the steps 1-9, and repeating the test;
wherein the relationship among Ams, Bms and Cms is: a < B < C <300ms, the relationship between Ds or Fs is D < F <15 s.
5. The test method according to claim 4, characterized in that: the Ams, the Bms, and the Cms are 30ms, 70ms, and 280ms, respectively; d is 2s and F is 10 s.
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| JPH0222568A (en) * | 1988-07-12 | 1990-01-25 | Toshiba Eng Co Ltd | Simulator device for testing digital current differential relay |
| JP2531988B2 (en) * | 1989-08-02 | 1996-09-04 | 関西電力株式会社 | Transformer protection relay device test equipment and test method |
| CN2795871Y (en) * | 2004-11-03 | 2006-07-12 | 上海电器科学研究所（集团）有限公司 | Electric life test device for contactor and startor |
| CN105548877B (en) * | 2016-02-18 | 2018-07-27 | 上海沪工汽车电器有限公司 | A kind of AUTOMOTIVE RELAY life test method |
| CN205920193U (en) * | 2016-05-18 | 2017-02-01 | 深圳市富康实业有限公司 | Relay load test device |
| CN206990693U (en) * | 2017-04-25 | 2018-02-09 | 贵州振华群英电器有限公司（国营第八九一厂） | A kind of contactor machinery ageing monitor |
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2018
- 2018-06-15 CN CN201810617388.8A patent/CN109030987B/en active Active
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