CN113552475B - Current surge test device - Google Patents
Current surge test device Download PDFInfo
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- CN113552475B CN113552475B CN202010332690.6A CN202010332690A CN113552475B CN 113552475 B CN113552475 B CN 113552475B CN 202010332690 A CN202010332690 A CN 202010332690A CN 113552475 B CN113552475 B CN 113552475B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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Abstract
The invention discloses a current surge test device, which comprises a magnetic latching relay RL2, an inrush current supply circuit and a first load circuit, wherein when a pulse signal is loaded on the magnetic latching relay RL2 and the inrush current supply circuit, the magnetic latching relay RL2 and tested electrical equipment form a loop, and the inrush current supply circuit generates an inrush current to act on the tested electrical equipment; the first load circuit is used for adjusting the size of the surge current. The testing device provided by the invention realizes the adjustment of the surge current through the first load circuit, can provide different surge currents according to the tested electrical equipment, can perform the current surge tests of all tested conventional relays and tested electrical equipment, and has strong practicability.
Description
Technical Field
The invention relates to a current surge test device.
Background
A Relay (Relay), also called Relay, is an electronic control device having a control system (also called input loop) and a controlled system (also called output loop), usually applied in an automatic control circuit, which is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, the circuit has the functions of automatic regulation, safety protection, circuit conversion and the like.
The relay is an automatic switch element with an isolation function, is widely applied to remote control, remote measurement, communication, automatic control, mechatronics and power electronic equipment, and is one of the most important control elements.
Relays generally have sensing mechanisms (input parts) that can reflect certain input variables (e.g., current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); an actuating mechanism (output part) which can realize the on and off control of the controlled circuit; between the input part and the output part of the relay, there is also an intermediate mechanism (driving part) for coupling and isolating the input quantity, processing the function and driving the output part.
At present, more and more relays need to bear some large surge current in the using process, so the surge current bearing capacity of the relays needs to be verified in the production and test processes of the relays. However, the existing relays are various in types, the load size difference is large, a single device is difficult to meet the surge load test required by a relay manufacturer, and if a plurality of surge load test devices are purchased, the cost is high.
Disclosure of Invention
The invention aims to provide a current surge testing device which is simple in device, good in stability, strong in reliability and wide in application range.
In order to achieve the purpose of the invention, the current surge test device provided by the invention comprises a magnetic latching relay RL2, an inrush current supply circuit and a first load circuit, wherein when a pulse signal is loaded on the magnetic latching relay RL2 and the inrush current supply circuit, the magnetic latching relay RL2 and tested electrical equipment form a loop, and the inrush current supply circuit generates an inrush current to act on the tested electrical equipment; the first load circuit is used for adjusting the size of the surge current.
The invention has the beneficial effects that: the testing device provided by the invention realizes the adjustment of the surge current through the first load circuit, can provide different surge currents according to the tested electrical equipment, can perform current surge tests on all tested conventional relays and tested electrical equipment, and has strong practicability.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is one of the schematic circuit diagrams of the current surge testing device provided by the present invention;
fig. 2 is a second schematic circuit diagram of the current surge testing device according to the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the inventive arrangements can be practiced without one or more of the specific details, or with other methods. In other instances, well-known methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Referring to fig. 1-2, the current surge testing device provided by the invention comprises a magnetic latching relay RL2, an inrush current supply circuit and a first load circuit, wherein when a pulse signal is loaded on the magnetic latching relay RL2 and the inrush current supply circuit, the magnetic latching relay RL2 and tested electrical equipment form a loop, and the inrush current supply circuit generates an inrush current to act on the tested electrical equipment; the first load circuit is used for adjusting the magnitude of surge current.
The inrush current supply circuit includes a first intermediate relay RL1, or a first intermediate relay RL1 and a second intermediate relay RL3. The pulse signal can be used for any equipment to provide, and the breaker that adopts adjustable voltage pulse width here provides, has realized the regulation to electric current surge pulse width through the breaker, and control surge current time accuracy is high, and the practicality is stronger.
The magnetic latching relay RL2 herein employs a double-coil common-negative magnetic latching relay.
The test device provided by the invention can be used for the current surge test of the relay and can also be used for other electrical equipment; here, a current surge test for a relay will be described as an example.
Referring to fig. 1, the moving contact point a-of the magnetic latching relay RL2 is connected with one end of the coil of the tested relay RL4, the other end of the coil of the tested relay RL4 is grounded, and the moving contact point a + of the magnetic latching relay RL2 is connected with a load power supply; the movable contact + A1 of the first intermediate relay RL1 is grounded, the movable contact-A2 is connected with the movable contact-A2 of the tested relay RL4 through a first load circuit, and the movable contact + A1 of the tested relay RL4 is connected with a surge power supply; the output of the coil of the breaker is connected with a first coil X + X-and a second coil Y + Y-of the magnetic latching relay RL2 and a coil of a first intermediate relay RL1, and the Y + of the second coil Y + Y-of the magnetic latching relay RL2 is connected with the + X1 end of the coil of the first intermediate relay RL 1; the Y-end of the second coil Y + Y-of the magnetic latching relay RL2 is grounded.
The coil of the breaker outputs pulse signals to be loaded on the coils of the magnetic latching relay RL2 and the first intermediate relay RL1, the moving contact A + A-of the magnetic latching relay RL2 is attracted, and a load power supply is loaded on the coil of the tested relay RL4 through the magnetic latching relay RL2 and attracted by the moving contact A + A1-A2 of the tested relay RL 4; the surge power supply is loaded on a movable contact-A2 of a first intermediate relay RL1 through a tested relay RL4 and a first load circuit; the first intermediate relay RL1 is attracted by the movable contact + A1-A2 of the breaker coil under the condition that the breaker coil outputs a pulse signal; the magnetic latching relay RL2, the first intermediate relay RL1, the relay to be tested RL4 and the first load circuit form a loop to generate surge current. The pulse signal output by the coil of the breaker is grounded through the Y-end of the second coil Y + Y-of the magnetic latching relay RL2, so that the coil of the first intermediate relay RL1 obtains a transient current pulse signal, and the first intermediate relay RL1 is switched off after the movable contact-A2 + A1 of the first intermediate relay RL1 is temporarily attracted, so that a short-time surge current is formed for the surge current test of the tested relay RL 4. Because the tested relays have different specifications and different surge current requirements, different surge currents can be generated by changing the parameters of the first load circuit, and the test device is used for carrying out current surge tests on different conventional relays.
In order to ensure the steady state of the tested relay RL4, the movable contact-A2 of the tested relay RL4 is grounded through a second load circuit in the test process, and the second load circuit is used for enabling the tested electrical equipment to be in a steady-state working state, so that the steady-state current, the steady-state current time and the like can be tested. By varying the parameters of the second load circuit, different steady states can be achieved.
In addition, the test device provided by the invention can also be applied to testing the surge current carrying capacity of other electrical equipment, and can verify parameters such as the surge current, the steady-state current, the surge current time, the steady-state current time, the surge current times and the like of the equipment. When the device is used for testing the surge current carrying capacity of other electrical equipment, the electrical equipment to be tested only needs to be connected between the movable contact-A2 of the second intermediate relay RL3 and the first load circuit in series, as shown in FIG. 2. In the same way, the tested electric equipment is grounded through a second load circuit in the test process, and the second load circuit is used for enabling the tested electric equipment to be in a steady-state working state, so that the test on steady-state current, steady-state current time and the like is realized. By varying the parameters of the second load circuit, different steady states can be achieved.
The first load circuit comprises herein a resistor R1 and the second load circuit comprises a resistor R2. The parameters of the resistor R1 are obtained according to surge current and voltage required by a surge test, for example, the surge test performed by using the test device provided herein requires the surge voltage 200Vd.c. and the surge current 250A, and the resistor R1 is 200/250=0.8 Ω. The parameters of the resistor R2 are obtained according to the steady-state current and voltage required by the surge test, if the test device provided by the invention is used for obtaining the steady-state current 50A and the surge voltage 200Vd.c required by the surge test, the resistor R2 is 200/50=4 omega.
The surge power supply is provided for applying surge current, and the interrupters capable of adjusting the voltage pulse width are used for controlling the contact switching of the magnetic latching relay RL2 and the contact switching of the first intermediate relay RL1 and the second intermediate relay RL3.
Contact a +, contact a-in the figures herein represent the input and output terminals of the contacts. In the actual test process, only the situation that current enters from the common end or the positive end of the relay contact and flows out from the negative end is required to be ensured.
At present, more and more relays need to bear some larger surge currents in the using process, so that the surge current bearing capacity of the relays needs to be verified in the production and test processes of the relays, and the magnitude of the surge current borne by the tested relays, the time of bearing the surge current and the times of bearing the surge current are mainly checked. According to the surge test device provided by the technical scheme, the required surge current value, the steady state current value, the surge current time, the steady state current time and the number of times for bearing the surge current by the relay can be designed according to different surge test conditions of the relay. When the test is carried out according to the test indexes, the performance of the relay is normal after the relay bears the set surge current times, and then the relay meets the requirements.
Compared with the prior art, the test device provided by the invention has the following advantages:
1. the device is simple, and stability is good, and the reliability is high, and the fault maintenance is simple.
2. The tester can assemble the device according to the test requirement without purchasing special surge load test equipment.
3. The application range is wide, the current surge test of a conventional relay (comprising a high-voltage large-current contactor) with the surge current time of more than 1ms can be carried out, and the surge current can be completely controlled.
The testing device provided by the invention can be used for carrying out current surge tests of all conventional relays, the time accuracy of controlling surge current is high, and the adjustment of the pulse width of the current surge is very convenient and quick; when the current surge test is carried out, all indexes can meet the national relevant standards; the tester can combine the surge current test device by oneself according to the experimental needs, and the practicality is very strong.
The present disclosure has been described in relation to the above embodiments, which are only examples for implementing the present disclosure. It must be noted that the disclosed embodiments do not limit the scope of the disclosure. Rather, variations and modifications are possible within the spirit and scope of the disclosure, and these are all within the scope of the disclosure.
Claims (7)
1. A current surge test device is characterized by comprising a magnetic latching relay RL2, an inrush current supply circuit and a first load circuit for adjusting the magnitude of an inrush current,
the magnetic latching relay RL2 comprises a first coil, a pair of contacts and a second coil; the first coil is used for closing the pair of contacts when a pulse signal is loaded, one contact of the pair of contacts is used for connecting a load power supply, the other contact is used as an output end A of the current surge test device, the surge current supply circuit for being connected with electrical equipment to be tested comprises a first intermediate relay RL1, the first intermediate relay RL1 comprises a coil A and a pair of contacts A, the coil A is used for closing the pair of contacts A when the pulse signal is loaded, one contact of the pair of contacts A is grounded, the other contact is used for being connected with one end of the first load circuit, and the other end of the first load circuit is used as an output end B of the current surge test device for being connected with the electrical equipment to be tested;
in the test process, a pulse signal is connected into the magnetic latching relay RL2 and the first intermediate relay RL1, the pair of contacts and the pair of contacts A are closed, and the magnetic latching relay RL2, the tested electric appliance, the first load circuit and the first intermediate relay RL1 form a loop; the second coil enables the coil A to be quickly cut off after the pulse signal is loaded, and surge current testing of tested electrical equipment is achieved.
2. The current surge testing device of claim 1, wherein: the surge current supply circuit also comprises a second intermediate relay RL3 which comprises a coil B and a pair of contacts B, wherein one end of the coil B is connected with the pair of contacts as the contacts of the output end A, and the other end of the coil B is grounded; one contact of the pair of contacts B is used for connecting a surge power supply, and the other contact is used as the output end of the current surge testing device and is used for being connected by tested electrical equipment; in the test process, a pulse signal is connected into the magnetic latching relay RL2 and the first intermediate relay RL1, the pair of contacts A and the pair of contacts B are closed, and the magnetic latching relay RL2, the second intermediate relay RL3, the tested electric appliance, the first load circuit and the first intermediate relay RL1 form a loop; the second coil enables the coil A to be quickly cut off after the pulse signal is loaded, and surge current testing of tested electrical equipment is achieved.
3. The current surge testing device of claim 1, wherein: the pulse signal is provided by a switch.
4. The current surge testing device of claim 1, wherein: the test device also comprises a second load circuit used for enabling the tested electric equipment to be in a steady-state working state.
5. The current surge testing device of claim 4, wherein: the second load circuit includes a resistor R2.
6. The current surge testing device of claim 1, wherein: load power and/or surge power are also included.
7. The current surge testing device of any of claims 1-6, wherein: the first load circuit includes a resistor R1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010332690.6A CN113552475B (en) | 2020-04-24 | 2020-04-24 | Current surge test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010332690.6A CN113552475B (en) | 2020-04-24 | 2020-04-24 | Current surge test device |
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| CN113552475A CN113552475A (en) | 2021-10-26 |
| CN113552475B true CN113552475B (en) | 2023-03-31 |
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