A high voltage box testing device

Abstract

The present application relates to a high-voltage box testing device, which, through an overcurrent protection circuit, disconnects the path between the power interface and the switching power supply and the driving circuit when the current value of the power supply input from the power interface is greater than the rated current value, thereby effectively reducing the risk of damage to the internal circuits of the testing device and the high-voltage box due to overcurrent in the power supply input to the testing device; in addition, by suppressing the transient voltage of the voltage of the internal circuit through the switching power supply and outputting a constant second power supply voltage, it is possible to effectively reduce the risk of serious damage to the internal circuits of the testing device and the high-voltage box due to overvoltage in the internal circuit of the switching power supply in the testing device.

Description

Technical Field

[0001] The present application belongs to the field of rail transit technology, and in particular relates to a high-voltage box testing device. Background Art

[0002] The high-voltage box in subway and other rail transit vehicles is an important component in rail transit vehicles. The main function of the high-voltage box is to connect or disconnect the high-voltage connection between the vehicle's main circuit and the contact network as needed, and to monitor the high-voltage connection status of the entire vehicle's high-voltage system in real time. It has current and voltage acquisition functions. When the high-voltage box fails, it automatically disconnects the high-voltage connection between the vehicle's main circuit and the contact network to protect equipment such as traction inverters.

[0003] Before leaving the factory, each high-voltage box needs to be powered on to test whether the wiring of the low-voltage cables inside the high-voltage box is correct. At present, the power supply (such as AC power) is generally input into the high-voltage box test device, and then the high-voltage box is powered by the test device to operate the main contacts and auxiliary contacts of the high-speed circuit breaker in the high-voltage box. Then, the multiple output terminals of the high-voltage box are tested with a multimeter to determine whether the wiring of the low-voltage cables inside the high-voltage box is correct. However, during the high-voltage box test, it may be affected by lightning weather, static electricity, and electromagnetic interference from the surrounding environment, so that the power input to the test device may have overcurrent, which may cause the test device and the internal circuits of the high-voltage box to be seriously damaged. Utility Model Content

[0004] The purpose of the present application is to provide a high-voltage box testing device; the high-voltage box testing device provided by the present application can effectively reduce the risk of serious damage to the internal circuits of the testing device and the high-voltage box due to overcurrent in the power supply input to the testing device.

[0005] The technical solutions provided by this application are as follows:

[0006] A high-voltage box testing device comprises: a power supply interface, an overcurrent protection circuit, a switching power supply, a driving circuit and an output interface;

[0007] The first end of the power interface is used to connect to an external power source;

[0008] The second end of the power interface is connected to the first end of the overcurrent protection circuit;

[0009] The second end of the overcurrent protection circuit is connected to the first end of the switching power supply and the first end of the driving circuit;

[0010] The second end of the switching power supply is connected to the second end of the driving circuit;

[0011] The third terminal of the switching power supply and the third terminal of the driving circuit are connected to the first terminal of the output interface;

[0012] The second end of the output interface is used to connect to the coil of the first high-speed circuit breaker in the high-voltage box;

[0013] The overcurrent protection circuit is used to output the input first power supply voltage to the switching power supply and the driving circuit when the current value of the power supply input from the power supply interface is less than or equal to the rated current value, and to disconnect the path between the power supply interface and the switching power supply and the driving circuit when the current value of the power supply input from the power supply interface is greater than the rated current value;

[0014] The switching power supply is used to receive the first power supply voltage, suppress transient voltage of the voltage of the internal circuit, and output a constant second power supply voltage;

[0015] The drive circuit is used to close when receiving the first power supply voltage, and output the received second power supply voltage to the coil of the first high-speed circuit breaker through the output interface, so that the coil of the first high-speed circuit breaker is energized and the main contacts and auxiliary contacts of the first high-speed circuit breaker are actuated.

[0016] Optionally, the overcurrent protection circuit includes a first circuit breaker, the drive circuit includes a time relay, a first contactor, a second contactor and a holding resistor, and the output interface includes a first output interface and a second output interface;

[0017] The second end of the power interface is connected to the first end of the first contact of the first circuit breaker and the first end of the second contact of the first circuit breaker;

[0018] The second end of the first contact of the first circuit breaker is connected to the first input end of the switching power supply, the first end of the normally open contact of the time relay, the first end of the coil of the first contactor, the first end of the normally closed contact of the time relay, and the first end of the coil of the time relay;

[0019] The second end of the normally closed contact of the time relay is connected to the first end of the coil of the second contactor;

[0020] The second end of the second contact of the first circuit breaker is connected to the second input end of the switching power supply, the second end of the normally open contact of the time relay, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay;

[0021] The ground terminal of the switching power supply is grounded;

[0022] The first positive output terminal of the switching power supply is connected to the first end of the normally open contact of the first contactor;

[0023] The second end of the normally open contact of the first contactor is connected to the first end of the holding resistor and the first end of the normally open contact of the second contactor;

[0024] The second end of the holding resistor and the second end of the normally open contact of the second contactor are connected to the first end of the first output interface;

[0025] The second end of the first output interface is used to connect to the positive terminal of the coil of the first high-speed circuit breaker in the high-voltage box;

[0026] The negative output terminal of the switching power supply is connected to the first terminal of the second output interface;

[0027] The second end of the second output interface is used to be connected to the negative terminal of the coil of the first high-speed circuit breaker in the high-voltage box.

[0028] Optionally, the drive circuit further includes a second circuit breaker;

[0029] The first end of the first contact of the second circuit breaker is connected to the second end of the first contact of the first circuit breaker, the first input end of the switching power supply, and the first end of the normally open contact of the time relay;

[0030] The first end of the second contact of the second circuit breaker is connected to the second end of the second contact of the first circuit breaker and the second input end of the switching power supply;

[0031] The second end of the first contact of the second circuit breaker is connected to the first end of the coil of the first contactor, the first end of the normally closed contact of the time relay, and the first end of the coil of the time relay;

[0032] The second end of the normally closed contact of the time relay is connected to the first end of the coil of the second contactor;

[0033] The second end of the second contact of the second circuit breaker is connected to the second end of the normally open contact of the time relay, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay.

[0034] Optionally, the driving circuit further includes a first switch;

[0035] A first end of the first contact of the first switch is connected to a first end of the first contact of the second circuit breaker;

[0036] A first end of the second contact of the first switch is connected to a first end of the second contact of the second circuit breaker;

[0037] The second end of the first contact of the first switch is connected to the first end of the coil of the first contactor, the first end of the normally closed contact of the time relay, and the first end of the coil of the time relay;

[0038] The second end of the normally closed contact of the time relay is connected to the first end of the coil of the second contactor;

[0039] The second end of the second contact of the first switch is connected to the second end of the normally open contact of the time relay, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay.

[0040] Optionally, the driving circuit further includes an indicator light;

[0041] The first end of the indicator light is connected to the second end of the normally open contact of the time relay;

[0042] The second end of the indicator light is connected to the second end of the second contact of the first switch, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay.

[0043] Optionally, the output interface further includes a third output interface;

[0044] The first end of the third output interface is connected to the second end of the holding resistor, the second end of the normally open contact of the second contactor and the first end of the first output interface;

[0045] The second end of the third output interface is used to connect to the positive terminal of the coil of the second high-speed circuit breaker in the high-voltage box;

[0046] The second end of the second output interface is also used to connect to the negative terminal of the coil of the second high-speed circuit breaker in the high-voltage box.

[0047] Optionally, the driving circuit further includes a third circuit breaker, and the output interface further includes a fourth output interface;

[0048] The first end of the third circuit breaker is connected to the second positive output end of the switching power supply;

[0049] The second end of the third circuit breaker is connected to the first end of the fourth output interface;

[0050] The second end of the fourth output interface is used to connect to the positive terminal of the electromagnetic lock in the high-voltage box;

[0051] The second end of the second output interface is also used to connect to the negative terminal of the electromagnetic lock in the high-voltage box.

[0052] Optionally, the driving circuit further includes a second switch;

[0053] The first end of the second switch is connected to the second end of the third circuit breaker;

[0054] The second end of the second switch is connected to the first end of the fourth output interface.

[0055] Compared with the prior art, the present application provides a high-voltage box test device, which, through an overcurrent protection circuit, disconnects the path between the power interface and the switching power supply and the drive circuit when the current value of the power supply input from the power interface is greater than the rated current value, thereby effectively reducing the risk of damage to the internal circuits of the test device and the high-voltage box due to overcurrent in the power supply input to the test device; in addition, by suppressing the transient voltage of the voltage of the internal circuit through the switching power supply and outputting a constant second power supply voltage, it is possible to effectively reduce the risk of serious damage to the internal circuits of the test device and the high-voltage box due to overvoltage in the internal circuit of the switching power supply in the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 This is a structural block diagram of a high-voltage box testing device provided in an embodiment of the present application;

[0058] Figure 2 A circuit diagram of a high-voltage box testing device provided in an embodiment of the present application;

[0059] Reference numerals: 100 - power interface; 200 - overcurrent protection circuit; 300 - switching power supply; 400 - drive circuit; 500 - output interface;

[0060] QF1-first circuit breaker;

[0061] KT1-time relay; KM1-first contactor; KM2-second contactor; R1-holding resistor; QF2-second circuit breaker; QF3-third circuit breaker; HL1-indicator light; SA1-first switch; SA2-second switch;

[0062] 510 - first output interface; 520 - second output interface; 530 - third output interface; 540 - fourth output interface. DETAILED DESCRIPTION

[0063] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0064] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0065] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0067] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0068] like Figure 1As shown, the embodiment of the present application provides a high-voltage box testing device, including: a power interface 100, an overcurrent protection circuit 200, a switching power supply 300, a drive circuit 400 and an output interface 500; the first end of the power interface 100 is used to connect to an external power supply; the second end of the power interface 100 is connected to the first end of the overcurrent protection circuit 200; the second end of the overcurrent protection circuit 200 is connected to the first end of the switching power supply 300 and the first end of the drive circuit 400; the second end of the switching power supply 300 is connected to the second end of the drive circuit 400; the third end of the switching power supply 300 and the third end of the drive circuit 400 are connected to the first end of the output interface; the second end of the output interface is used to connect to the coil of the first high-speed circuit breaker in the high-voltage box; the overcurrent protection circuit 200 is used to connect to the external power supply; the second end of the power interface 100 is used to connect to the first end of the overcurrent protection circuit 200; the second end of the overcurrent protection circuit 200 is used to connect to the first end of the overcurrent protection circuit 200; the second end of the overcurrent protection circuit 200 is used to connect to the first end of the overcurrent protection circuit 200 and the first end of the drive circuit 400; the second end of the overcurrent protection circuit 200 is used to connect to the first end of the overcurrent protection circuit 2 ... When the current value of the power input from the power interface 100 is less than or equal to the rated current value, the input first power supply voltage is output to the switching power supply 300 and the drive circuit 400; when the current value of the power input from the power interface 100 is greater than the rated current value, the path between the power interface 100 and the switching power supply 300 and the drive circuit 400 is disconnected; the switching power supply 300 is used to receive the first power supply voltage, suppress the transient voltage of the voltage of the internal circuit, and output a constant second power supply voltage; the drive circuit 400 is used to close when receiving the first power supply voltage, and output the received second power supply voltage to the coil of the first high-speed circuit breaker through the output interface, so that the coil of the first high-speed circuit breaker is energized and the main contacts and auxiliary contacts of the first high-speed circuit breaker are actuated.

[0069] In this embodiment, the external power supply can be AC220V (i.e., alternating current 220V) mains power, and the AC220V mains power is input to the overcurrent protection circuit 200 through the power interface 100. When the current value of the AC220V power input from the power interface 100 is less than or equal to the rated current value, the overcurrent protection circuit 200 outputs the input first power supply voltage to the switching power supply 300 and the drive circuit 400. When the current value of the AC220V power input from the power interface 100 is greater than the rated current value, the overcurrent protection circuit 200 The device in the overcurrent protection circuit 200 is disconnected to disconnect the path between the power interface 100 and the switching power supply 300 and the driving circuit 400 to achieve overcurrent protection. The internal circuit of the switching power supply 300 is generally composed of a pulse width modulation control chip and a MOS tube (i.e., a metal oxide semiconductor field effect transistor). Under the influence of thunder and lightning weather, or under the influence of static electricity and electromagnetic interference in the surrounding environment, the internal circuit of the switching power supply 300 may have an overvoltage. The switching power supply 300 receives the first power supply voltage (AC220V) output by the overcurrent protection circuit 200, and performs transient voltage suppression on the voltage of the internal circuit, and outputs a constant second power supply voltage (DC110V) to the driving circuit 400 to achieve overvoltage protection. When the driving circuit 400 receives the first power supply voltage (AC220V) output by the overcurrent protection circuit 200, the device in the driving circuit 400 is closed, and the received second power supply voltage (DC110V) is output to the coil of the first high-speed circuit breaker in the high-voltage box through the output interface, so that the coil of the first high-speed circuit breaker is energized, so that the main contacts and auxiliary contacts of the first high-speed circuit breaker are actuated. Since there can be multiple auxiliary contacts in the first high-speed circuit breaker, specifically, the main contact of the first high-speed circuit breaker is switched from the normally open state to the normally closed state, and the multiple auxiliary contacts of the first high-speed circuit breaker are switched from the normally open state to the normally closed state or from the normally closed state to the normally open state, and then the multiple output terminals of the high-voltage box are tested by a multimeter to determine whether the wiring of the low-voltage cables inside the high-voltage box is correct. The high-voltage box testing device and the multimeter can be used to test the wiring of the low-voltage cables inside the DC1500V and DC750V high-voltage boxes of rail transit.

[0070] Compared with the prior art, the present application provides a high-voltage box test device, which, through the overcurrent protection circuit 200, disconnects the path between the power interface 100 and the switching power supply 300 and the drive circuit 400 when the current value of the power supply input from the power interface 100 is greater than the rated current value, thereby effectively reducing the risk of damage to the internal circuits of the test device and the high-voltage box due to overcurrent in the power supply input to the test device; in addition, by suppressing transient voltage of the voltage of the internal circuit by the switching power supply 300 and outputting a constant second power supply voltage, it is possible to effectively reduce the risk of serious damage to the internal circuits of the test device and the high-voltage box due to overvoltage in the internal circuit of the switching power supply 300 in the test device.

[0071] like Figure 2 As shown, as an implementation mode, in the embodiment of the present application, the overcurrent protection circuit 200 includes a first circuit breaker QF1, the drive circuit 400 includes a time relay KT1, a first contactor KM1, a second contactor KM2 and a holding resistor R1, and the output interface 500 includes a first output interface 510 and a second output interface 520; the second end of the power interface 100 is connected to the first end of the first contact of the first circuit breaker QF1 and the first end of the second contact of the first circuit breaker QF1; the second end of the first contact of the first circuit breaker QF1 is connected to the first input end of the switching power supply 300, the first end of the normally open contact of the time relay KT1, the first end of the coil of the first contactor KM1, the first end of the normally closed contact of the time relay KT1, and the first end of the coil of the time relay KT1; the second end of the normally closed contact of the time relay KT1 is connected to the first end of the coil of the second contactor KM2; the second end of the second contact of the first circuit breaker QF1 is connected to the switching power supply 30 0, the second end of the normally open contact of the time relay KT1, the second end of the coil of the first contactor KM1, the second end of the coil of the second contactor KM2, and the second end of the coil of the time relay KT1 are connected; the grounding end of the switching power supply 300 is grounded; the first positive output end of the switching power supply 300 is connected to the first end of the normally open contact of the first contactor KM1; the second end of the normally open contact of the first contactor KM1 is connected to the first end of the holding resistor R1 and the first end of the normally open contact of the second contactor KM2; the second end of the holding resistor R1 and the second end of the normally open contact of the second contactor KM2 are connected to the first end of the first output interface 510; the second end of the first output interface 510 is used to be connected to the positive end of the coil of the first high-speed circuit breaker in the high-voltage box; the negative output end of the switching power supply 300 is connected to the first end of the second output interface 520; the second end of the second output interface 520 is used to be connected to the negative end of the coil of the first high-speed circuit breaker in the high-voltage box.

[0072] In this embodiment, the first circuit breaker QF1 can be an AC circuit breaker, the first contact and the second contact of the first circuit breaker QF1 act synchronously, the first contactor KM1 and the second contactor KM2 can be AC ​​contactors, and the second end of the power interface 100 can be connected to the live wire L and the neutral wire N of the mains. During the test, the staff can control the first circuit breaker QF1 so that the first contact and the second contact of the first circuit breaker QF1 are closed, the coil of the first contactor KM1, the coil of the second contactor KM2, and the coil of the time relay KT1 are energized, the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2 are closed, and the first positive output terminal and the negative output terminal of the switching power supply 300 are closed. The second power supply voltage (DC110V) outputted from the first terminal flows through the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2, and is outputted to the coil of the first high-speed circuit breaker in the high-voltage box through the first output interface 510 and the second output interface 520, so that the coil of the first high-speed circuit breaker is energized, the main contact and multiple auxiliary contacts of the first high-speed circuit breaker are actuated, the main contact of the first high-speed circuit breaker is switched from the normally open state to the normally closed state, and the multiple auxiliary contacts of the first high-speed circuit breaker are switched from the normally open state to the normally closed state or from the normally closed state to the normally open state, the normally closed contact of the time relay KT1 is disconnected after a delay of 1S (i.e., 1 second), so that the second contactor K The coil of M2 loses power, causing the normally open contact of the second contactor KM2 to be disconnected, so that the holding resistor R1 connected in parallel with the normally open contact of the second contactor KM2 is connected between the normally open contact of the first contactor KM1 and the first output interface 510, and a small current passes through the coil of the first high-speed circuit breaker, so that the main contact of the first high-speed circuit breaker remains in a closed state, and then the multiple output terminals of the high-voltage box are tested by a multimeter to determine whether the wiring of the low-voltage cables inside the high-voltage box is correct. By limiting the current by holding the resistor R1, the coil of the first high-speed circuit breaker in the high-voltage box can be effectively prevented from being burned due to long-term high current; the rated current value is the rated current value of the first circuit breaker QF1, and when it is affected When the current value of the power input from the power interface 100 is greater than the rated current value of the first circuit breaker QF1 due to the influence of lightning weather or static electricity and electromagnetic interference from the surrounding environment, the first contact and the second contact of the first circuit breaker QF1 are disconnected synchronously, so that the path between the power interface 100 and the switching power supply 300 and the time relay KT1, the first contactor KM1 and the second contactor KM2 in the drive circuit 400 is disconnected, which can effectively protect the switching power supply 300, the time relay KT1, the first contactor KM1 and the second contactor KM2 in the drive circuit 400 and the internal circuit in the high-voltage box connected to the drive circuit 400 through the output interface 500.

[0073] like Figure 2As shown, as an implementation mode, in the embodiment of the present application, the drive circuit 400 also includes a second circuit breaker QF2; the first end of the first contact of the second circuit breaker QF2 is connected to the second end of the first contact of the first circuit breaker QF1, the first input end of the switching power supply 300, and the first end of the normally open contact of the time relay KT1; the first end of the second contact of the second circuit breaker QF2 is connected to the second end of the second contact of the first circuit breaker QF1 and the second input end of the switching power supply 300; the second end of the first contact of the second circuit breaker QF2 is connected to the first end of the coil of the first contactor KM1, the first end of the normally closed contact of the time relay KT1, and the first end of the coil of the time relay KT1; the second end of the normally closed contact of the time relay KT1 is connected to the first end of the coil of the second contactor KM2; the second end of the second contact of the second circuit breaker QF2 is connected to the second end of the normally open contact of the time relay KT1, the second end of the coil of the first contactor KM1, the second end of the coil of the second contactor KM2, and the second end of the coil of the time relay KT1.

[0074] In this embodiment, the second circuit breaker QF2 can be an AC circuit breaker, and the first contact and the second contact of the second circuit breaker QF2 act synchronously. During testing, the staff can control the first circuit breaker QF1 and the second circuit breaker QF2, so that the first contact and the second contact of the first circuit breaker QF1 and the first contact and the second contact of the second circuit breaker QF2 are closed, so that the coil of the first high-speed circuit breaker is energized and the main contact and the auxiliary contact of the first high-speed circuit breaker are actuated; when the current value input to the first end of the first contact and the second contact of the second circuit breaker QF2 is greater than the rated current value of the second circuit breaker QF2 due to the influence of lightning weather or the influence of static electricity and electromagnetic interference in the surrounding environment, the first contact and the second contact of the second circuit breaker QF2 are disconnected synchronously, which can further effectively protect the time relay KT1, the first contactor KM1 and the second contactor KM2 in the drive circuit 400 and the internal circuit in the high-voltage box connected to the drive circuit 400 through the output interface 500.

[0075] like Figure 2As shown, as an implementation mode, in the embodiment of the present application, the drive circuit 400 also includes a first switch SA1; the first end of the first contact of the first switch SA1 is connected to the first end of the first contact of the second circuit breaker QF2; the first end of the second contact of the first switch SA1 is connected to the first end of the second contact of the second circuit breaker QF2; the second end of the first contact of the first switch SA1 is connected to the first end of the coil of the first contactor KM1, the first end of the normally closed contact of the time relay KT1, and the first end of the coil of the time relay KT1; the second end of the normally closed contact of the time relay KT1 is connected to the first end of the coil of the second contactor KM2; the second end of the second contact of the first switch SA1 is connected to the second end of the normally open contact of the time relay KT1, the second end of the coil of the first contactor KM1, the second end of the coil of the second contactor KM2, and the second end of the coil of the time relay KT1.

[0076] In this embodiment, the first switch SA1 can be a knob switch, and the first contact and the second contact of the first switch SA1 act synchronously. During testing, the staff can first control the first circuit breaker QF1 and the second circuit breaker QF2 to close the first contact and the second contact of the first circuit breaker QF1 and the first contact and the second contact of the second circuit breaker QF2, and then turn the first switch SA1 to the ON position to close the first contact and the second contact of the first switch SA1, so that the coil of the first high-speed circuit breaker is energized. The operation is simple and convenient.

[0077] like Figure 2 As shown, as an implementation mode, in the embodiment of the present application, the drive circuit 400 also includes an indicator light HL1; the first end of the indicator light HL1 is connected to the second end of the normally open contact of the time relay KT1; the second end of the indicator light HL1 is connected to the second end of the second contact of the first switch SA1, the second end of the coil of the first contactor KM1, the second end of the coil of the second contactor KM2, and the second end of the coil of the time relay KT1.

[0078] In this embodiment, during the test, the staff can control the first circuit breaker QF1 and the second circuit breaker QF2, and turn the first switch SA1 to the ON position, so that the first contact and the second contact of the first circuit breaker QF1 are closed, the first contact and the second contact of the second circuit breaker QF2, and the first contact and the second contact of the first switch SA1 are closed, the coil of the first contactor KM1, the coil of the second contactor KM2, and the coil of the time relay KT1 are energized, the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2 are closed, and the second power supply voltage (DC110V) output by the first positive output terminal and the negative output terminal of the switching power supply 300 flows through the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2, and is output to the coil of the first high-speed circuit breaker in the high-voltage box through the first output interface 510 and the second output interface 520. The positive terminal and the negative terminal enable the coil of the first high-speed circuit breaker to be energized, so that the main contacts and auxiliary contacts of the first high-speed circuit breaker are actuated, and the normally open contact of the time relay KT1 is closed after a delay of 1S (i.e. 1 second), so that the indicator light HL1 is lit, and the normally closed contact of the time relay KT1 is disconnected after a delay of 1S (i.e. 1 second), so that the coil of the second contactor KM2 is de-energized, so that the normally open contact of the second contactor KM2 is disconnected, so that the holding resistor R1 connected in parallel with the normally open contact of the second contactor KM2 is connected between the normally open contact of the first contactor KM1 and the first output interface 510, and a small current passes through the coil of the first high-speed circuit breaker, so that the main contacts of the first high-speed circuit breaker are kept in a closed state, so that the staff can know that the normally open contact of the time relay KT1 is in a closed state through the indicator light HL1, and then know that the test device is in a normal operating state.

[0079] like Figure 2 As shown, as an implementation mode, in the embodiment of the present application, the output interface also includes a third output interface 530; the first end of the third output interface 530 is connected to the second end of the holding resistor R1, the second end of the normally open contact of the second contactor KM2 and the first end of the first output interface 510; the second end of the third output interface 530 is used to be connected to the positive terminal of the coil of the second high-speed circuit breaker in the high-voltage box; the second end of the second output interface 520 is also used to be connected to the negative terminal of the coil of the second high-speed circuit breaker in the high-voltage box.

[0080] In this embodiment, since some of the high-voltage boxes to be tested have two high-speed circuit breakers, namely, the first high-speed circuit breaker and the second high-speed circuit breaker, during the test, the staff can first control the first circuit breaker QF1 and the second circuit breaker QF2 to close the first contact and the second contact of the first circuit breaker QF1 and the first contact and the second contact of the second circuit breaker QF2, and then turn the first switch SA1 to the ON position to close the first contact and the second contact of the first switch SA1, the coil of the first contactor KM1, the coil of the second contactor KM2, and the coil of the time relay KT1 are energized, and the normally open contacts of the first contactor KM1 and the normally open contacts of the second contactor KM2 are closed. The second power supply voltage (DC110V) outputted from the first positive output terminal and the negative output terminal of the switching power supply 300 flows through the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2, and is outputted to the positive terminal and the negative terminal of the coil of the first high-speed circuit breaker in the high-voltage box through the first output interface 510 and the second output interface 520, and is outputted to the positive terminal and the negative terminal of the coil of the second high-speed circuit breaker in the high-voltage box through the third output interface 530 and the second output interface 520, so that the coil of the first high-speed circuit breaker and the coil of the second high-speed circuit breaker are energized, so that the main contacts and auxiliary contacts of the first high-speed circuit breaker and the second high-speed circuit breaker are actuated.

[0081] like Figure 2 As shown, as an implementation mode, in an embodiment of the present application, the drive circuit 400 also includes a third circuit breaker QF3, and the output interface also includes a fourth output interface 540; the first end of the third circuit breaker QF3 is connected to the second positive output end of the switching power supply 300; the second end of the third circuit breaker QF3 is connected to the first end of the fourth output interface 540; the second end of the fourth output interface 540 is used to be connected to the positive end of the electromagnetic lock in the high-voltage box; the second end of the second output interface 520 is also used to be connected to the negative end of the electromagnetic lock in the high-voltage box.

[0082] In this embodiment, the third circuit breaker QF3 can be a DC circuit breaker. Since the voltage of the high-voltage box during the test is relatively high, in order to prevent the staff from opening the door of the high-voltage box by mistake and causing a safety accident, an electromagnetic lock will be set on the door of the high-voltage box. During the test, the staff can first control the first circuit breaker QF1, the second circuit breaker QF2 and the third circuit breaker QF3 to close the first contact and the second contact of the first circuit breaker QF1, the first contact and the second contact of the second circuit breaker QF2, and the two ends of the third circuit breaker QF3, and then turn the first switch SA1 to ON. The first contact and the second contact of the first switch SA1 are closed, the coil of the first contactor KM1, the coil of the second contactor KM2, and the coil of the time relay KT1 are energized, the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2 are closed, and the second power supply voltage (DC110V) output by the first positive output terminal and the negative output terminal of the switching power supply 300 flows through the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2, and is output to the first output terminal 510 and the second output terminal 520 in the high-voltage box. The positive terminal and negative terminal of the coil of the high-speed circuit breaker are output to the positive terminal and negative terminal of the coil of the second high-speed circuit breaker in the high-voltage box through the third output interface 530 and the second output interface 520, so that the coil of the first high-speed circuit breaker and the coil of the second high-speed circuit breaker are energized, so that the main contacts and auxiliary contacts of the first high-speed circuit breaker and the second high-speed circuit breaker are actuated, and the second power supply voltage (DC110V) outputted from the second positive output terminal and the negative output terminal of the switching power supply 300 flows through the third circuit breaker QF3 and passes through the fourth output interface 540 and the second output interface 520. The positive and negative terminals of the electromagnetic lock on the door of the high-voltage box are outputted, so that the electromagnetic lock is activated and the door of the high-voltage box is locked, which can effectively avoid the risk of safety accidents caused by the staff accidentally opening the door of the high-voltage box; when the current value input to the first end of the third circuit breaker QF3 is greater than the rated current value of the third circuit breaker QF3 due to lightning weather or static electricity and electromagnetic interference from the surrounding environment, the two ends of the third circuit breaker QF3 are disconnected, which can further effectively protect the electromagnetic lock and effectively reduce the risk of damage to the electromagnetic lock.

[0083] like Figure 2 As shown, as an implementation manner, in the embodiment of the present application, the drive circuit 400 also includes a second switch SA2; the first end of the second switch SA2 is connected to the second end of the third circuit breaker QF3; the second end of the second switch SA2 is connected to the first end of the fourth output interface 540.

[0084] In this embodiment, the second switch SA2 can be a knob switch. During testing, the staff can first control the first circuit breaker QF1, the second circuit breaker QF2, and the third circuit breaker QF3, so that the first contact and the second contact of the first circuit breaker QF1, the first contact and the second contact of the second circuit breaker QF2, and the two ends of the third circuit breaker QF3 are closed, and then turn the first switch SA1 and the second switch SA2 to the ON position, so that the first contact and the second contact of the first switch SA1 and the two ends of the second switch SA2 are closed, so that the coil of the first high-speed circuit breaker, the coil of the second high-speed circuit breaker and the electromagnetic lock are energized, and the operation is simple and convenient.

[0085] It should be understood that the use of "system", "device", "unit" and / or "module" in this application is only a method for distinguishing different components, elements, parts, parts or assemblies at different levels. However, if other words can achieve the same purpose, the word can be replaced by other expressions.

[0086] The embodiments in this specification are described in a progressive manner, and each embodiment focuses on the

[0087] For the differences between other embodiments, the same or similar parts between the embodiments may be referred to each other.

[0088] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high voltage box testing device, characterized in that: include: Power interface, overcurrent protection circuit, switching power supply, drive circuit and output interface; The first end of the power interface is used to connect to an external power source; The second end of the power interface is connected to the first end of the overcurrent protection circuit; The second end of the overcurrent protection circuit is connected to the first end of the switching power supply and the first end of the driving circuit; The second end of the switching power supply is connected to the second end of the driving circuit; The third terminal of the switching power supply and the third terminal of the driving circuit are connected to the first terminal of the output interface; The second end of the output interface is used to connect to the coil of the first high-speed circuit breaker in the high-voltage box; The overcurrent protection circuit is used to output the input first power supply voltage to the switching power supply and the driving circuit when the current value of the power supply input from the power supply interface is less than or equal to the rated current value, and to disconnect the path between the power supply interface and the switching power supply and the driving circuit when the current value of the power supply input from the power supply interface is greater than the rated current value; The switching power supply is used to receive the first power supply voltage, suppress transient voltage of the voltage of the internal circuit, and output a constant second power supply voltage; The drive circuit is used to close when receiving the first power supply voltage, and output the received second power supply voltage to the coil of the first high-speed circuit breaker through the output interface, so that the coil of the first high-speed circuit breaker is energized and the main contacts and auxiliary contacts of the first high-speed circuit breaker are actuated.

2. The high voltage box testing device according to claim 1, characterized in that: The overcurrent protection circuit includes a first circuit breaker, the drive circuit includes a time relay, a first contactor, a second contactor and a holding resistor, and the output interface includes a first output interface and a second output interface; The second end of the power interface is connected to the first end of the first contact of the first circuit breaker and the first end of the second contact of the first circuit breaker; The second end of the first contact of the first circuit breaker is connected to the first input end of the switching power supply, the first end of the normally open contact of the time relay, the first end of the coil of the first contactor, the first end of the normally closed contact of the time relay, and the first end of the coil of the time relay; The second end of the normally closed contact of the time relay is connected to the first end of the coil of the second contactor; The second end of the second contact of the first circuit breaker is connected to the second input end of the switching power supply, the second end of the normally open contact of the time relay, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay; The ground terminal of the switching power supply is grounded; The first positive output terminal of the switching power supply is connected to the first end of the normally open contact of the first contactor; The second end of the normally open contact of the first contactor is connected to the first end of the holding resistor and the first end of the normally open contact of the second contactor; The second end of the holding resistor and the second end of the normally open contact of the second contactor are connected to the first end of the first output interface; The second end of the first output interface is used to connect to the positive terminal of the coil of the first high-speed circuit breaker in the high-voltage box; The negative output terminal of the switching power supply is connected to the first terminal of the second output interface; The second end of the second output interface is used to be connected to the negative terminal of the coil of the first high-speed circuit breaker in the high-voltage box.

3. The high voltage box testing device according to claim 2, characterized in that: The drive circuit also includes a second circuit breaker; The first end of the first contact of the second circuit breaker is connected to the second end of the first contact of the first circuit breaker, the first input end of the switching power supply, and the first end of the normally open contact of the time relay; The first end of the second contact of the second circuit breaker is connected to the second end of the second contact of the first circuit breaker and the second input end of the switching power supply; The second end of the first contact of the second circuit breaker is connected to the first end of the coil of the first contactor, the first end of the normally closed contact of the time relay, and the first end of the coil of the time relay; The second end of the normally closed contact of the time relay is connected to the first end of the coil of the second contactor; The second end of the second contact of the second circuit breaker is connected to the second end of the normally open contact of the time relay, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay.

4. The high voltage box testing device according to claim 3, characterized in that: The driving circuit further includes a first switch; A first end of the first contact of the first switch is connected to a first end of the first contact of the second circuit breaker; A first end of the second contact of the first switch is connected to a first end of the second contact of the second circuit breaker; The second end of the first contact of the first switch is connected to the first end of the coil of the first contactor, the first end of the normally closed contact of the time relay, and the first end of the coil of the time relay; The second end of the normally closed contact of the time relay is connected to the first end of the coil of the second contactor; The second end of the second contact of the first switch is connected to the second end of the normally open contact of the time relay, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay.

5. The high voltage box testing device according to claim 4, characterized in that: The driving circuit also includes an indicator light; The first end of the indicator light is connected to the second end of the normally open contact of the time relay; The second end of the indicator light is connected to the second end of the second contact of the first switch, the second end of the coil of the first contactor, the second end of the coil of the second contactor, and the second end of the coil of the time relay.

6. The high voltage box testing device according to claim 2, characterized in that: The output interface also includes a third output interface; The first end of the third output interface is connected to the second end of the holding resistor, the second end of the normally open contact of the second contactor and the first end of the first output interface; The second end of the third output interface is used to connect to the positive terminal of the coil of the second high-speed circuit breaker in the high-voltage box; The second end of the second output interface is also used to connect to the negative terminal of the coil of the second high-speed circuit breaker in the high-voltage box.

7. The high voltage box testing device according to any one of claims 2 to 6, characterized in that: The driving circuit further includes a third circuit breaker, and the output interface further includes a fourth output interface; The first end of the third circuit breaker is connected to the second positive output end of the switching power supply; The second end of the third circuit breaker is connected to the first end of the fourth output interface; The second end of the fourth output interface is used to connect to the positive terminal of the electromagnetic lock in the high-voltage box; The second end of the second output interface is also used to connect to the negative terminal of the electromagnetic lock in the high-voltage box.

8. The high voltage box testing device according to claim 7, characterized in that: The driving circuit further includes a second switch; The first end of the second switch is connected to the second end of the third circuit breaker; The second end of the second switch is connected to the first end of the fourth output interface.

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