CN211148796U

CN211148796U - Detection box

Info

Publication number: CN211148796U
Application number: CN201920986702.XU
Authority: CN
Inventors: 吕晶
Original assignee: China Nuclear Industry Maintenance Co Ltd
Current assignee: China Nuclear Industry Maintenance Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-07-31
Anticipated expiration: 2029-06-26

Abstract

A detection box comprises a power distribution unit, a control unit, a detection unit and an indication unit; the power distribution unit is connected with an external power supply and used for performing voltage conversion on the external power supply to supply power; the control unit is connected with the power distribution unit and used for controlling the detection unit to detect; the detection unit is respectively connected with the power distribution unit and the control unit and is used for detecting a contactor and a circuit breaker in a medium-voltage distribution board and a power distribution drawer in a low-voltage distribution board; the indicating unit is connected with the power distribution unit and used for indicating the working state of the power distribution drawer; the detection is convenient and efficient, the operation safety level is high, and various false actions and accidental injuries in the detection process can be effectively avoided; various hidden dangers brought when the power transmission verification is pushed can be effectively avoided, and voltage and signal fluctuation of the whole row of disk cabinets is reduced.

Description

Detection box

Technical Field

The utility model belongs to the technical field of well low voltage distribution board detects, especially, relate to a detection case.

Background

At present, various maintenance and detection works exist in various medium and low voltage switchboards used by a nuclear power plant, and the maintenance and detection works are as follows:

in the aspect of medium voltage, a contactor and a breaker (hereinafter referred to as a medium voltage switch) involved in preventive maintenance of a medium voltage 6.3KV switchboard of a certain nuclear power plant are required to be connected through a control loop of the switchboard cabinet, and an off-switchboard control switch is switched on to achieve the purpose of maintenance, and the current control loop power transmission schemes are two: one is to use a temporary control cable to connect the control power in the 6.3KV cabinet for switching on, and the other is to use an external direct-current power supply for supplying power, and the direct-current power supply cable clamps and conducts a contact pin of an aviation plug of the equipment through a wire clamp, so that switching on is performed. However, these two schemes are not ideal, and both have certain disadvantages and potential safety hazards, for example, the first scheme is premised on ensuring that the upstream control power supply of the medium voltage cabinet is not in the maintenance position, and actually it is difficult to ensure that the upstream control power supply is in service particularly during overhaul, and in addition, there is a certain safety risk in disconnecting the connection wire in the medium voltage cabinet. The second scheme adopts an external direct-current power supply, and aviation plug contact pins are required to be clamped by a wire clamp, so that human errors and equipment power transmission errors are easily caused, and the equipment is damaged or even casualties and other events are caused.

In the aspect of low voltage, when a 380V distribution board fault of a low voltage of a certain nuclear power plant is processed, a drawer is often required to be pulled open for inspection, however, in the process of fault maintenance, fault points can be misjudged and processed, when the drawer is pushed in for closing verification, the wrong processing mode can cause the shutdown of a disk cabinet and the tripping of a transformer, and even can cause the risk of shutdown and shutdown.

In view of the use of nuclear power plant in well, low voltage distribution board, need carry out periodic test or the maintenance of aperiodic fault to contactor and the circuit breaker of well distribution board, the distribution drawer in the low voltage distribution board, there is a possibility, can configure into solitary navigation respectively for the used binding post when the detection of above-mentioned contactor, circuit breaker and distribution drawer or the maintenance, it matches with the corresponding interface of this application detection case configuration, only need once to connect wire, subsequent detection or maintenance process will be more accurate high-efficient.

Therefore, the traditional technical scheme has the problems that equipment damage caused by manual wiring errors and casualties caused by accidental electric shock exist in the preventive maintenance of the contactor and the breaker of the medium-voltage distribution board, and the distribution drawer of the low-voltage distribution board needs to be pushed into a power transmission verification mode during fault maintenance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a detection case aims at solving the equipment damage that the artificial wiring mistake caused and the casualties that the mistake electrocuted and led to the fact among the contactor and the circuit breaker preventive maintenance of the medium voltage distribution board that exists among the traditional technical scheme to and the distribution drawer of low voltage distribution board need push the problem that the power transmission was verified when the troubleshooting.

In a first aspect, an embodiment of the present disclosure provides a detection box, including a power distribution unit, a control unit, a detection unit, and an indication unit; the power distribution unit is connected with an external power supply and used for performing voltage conversion on the external power supply to supply power; the control unit is connected with the power distribution unit and used for controlling the detection unit to detect; the detection unit is respectively connected with the power distribution unit and the control unit and is used for detecting a contactor and a circuit breaker in a medium-voltage distribution board and a power distribution drawer in a low-voltage distribution board; and the indicating unit is connected with the power distribution unit and is used for indicating the working state of the power distribution drawer.

With reference to the first aspect, in a first implementation manner of the first aspect, the control unit includes a first fuse, a first button, a second button, a third button, a fourth button, a first relay, a second relay, a third relay, and a fourth relay; one output end of the power distribution unit is connected with the input end of the first fuse wire; the positive output end of the first fuse wire is respectively connected with the first end of the first button, the first end of the second button, the first end of the third button and the first end of the fourth button; the second end of the first button is connected with the first end of the first relay; the second end of the second button is connected with the first end of the second relay; the second end of the third button is connected with the first end of the third relay; the second end of the fourth button is connected with the first end of the fourth relay; the negative output end of the first fuse wire is connected with the second end of the first relay, the second end of the second relay, the second end of the third relay and the second end of the fourth relay respectively.

With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, an embodiment of the present disclosure includes a medium voltage detection unit and a low voltage detection unit; the medium voltage detection unit is respectively connected with the power distribution unit and the control unit and is used for preventive maintenance of a contactor and a circuit breaker in the medium voltage distribution board; and the low-voltage detection unit is respectively connected with the power distribution unit, the control unit and the medium-voltage detection unit and is used for fault maintenance of a power distribution drawer in the low-voltage distribution board.

With reference to the second implementation manner of the first aspect, in a third implementation manner of the first aspect, the medium voltage detection unit includes a second fuse, a first transfer switch, a second transfer switch, a first interface, and a second interface; one output end of the power distribution unit is connected with the input end of the second fuse wire; the output end of the second fuse wire is respectively connected with the first end of the first normally open contact of the first relay, the first end of the first normally open contact of the second relay, the first end of the first normally open contact of the third relay and the first end of the first normally open contact of the fourth relay; the second end of the first normally open contact of the first relay is connected with the common end of the first transfer switch; the normally open end of the first change-over switch is respectively connected with the first interface and the second interface; the second end of the first normally open contact of the second relay is connected with the input end of the second change-over switch; the output end of the second change-over switch is respectively connected with the first interface and the second interface; the second end of the first normally open contact of the third relay is connected with the first interface and the second interface respectively; and the second end of the first normally open contact of the fourth relay is connected with the first interface and the second interface respectively.

With reference to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the embodiment of the present disclosure includes a low-voltage detection unit that includes a third fusible link and a third interface; one output end of the power distribution unit is connected with the input end of the third fuse wire; the output end of the third fuse wire is respectively connected with the first end of a second normally open contact of the second relay, the first end of a second normally open contact of the third relay and the first end of a second normally open contact of the fourth relay; the third interface is respectively connected with the second end of the second normally open contact of the second relay, the second end of the second normally open contact of the third relay and the second end of the second normally open contact of the fourth relay; and the normally closed end of the first change-over switch is connected with the third interface.

With reference to the first aspect or the first or second or third or fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, an embodiment of the present disclosure includes a power distribution unit that includes an ac-dc conversion module and a dc-dc conversion module; the alternating current-direct current conversion module is connected with the output end of the external power supply and is used for converting alternating current output voltage of the external power supply into direct current 110V voltage; and the direct current conversion module is connected with the output end of the alternating current-direct current conversion module and is used for converting the output voltage of the alternating current-direct current conversion module into direct current 48V voltage.

With reference to the fifth implementation manner of the first aspect, in a sixth implementation manner of the first aspect, an embodiment of the present disclosure includes an indication unit that includes a first indicator light, a second indicator light, a third indicator light, and a fifth button; the first end of the fourth button is respectively connected with the input end of the fifth button, the first end of the first indicator light, the first end of the second indicator light and the first end of the third indicator light; the third interface is respectively connected with the output end of the fifth button, the second end of the first indicator light, the second end of the second indicator light and the second end of the third indicator light; and the second end of the fourth relay is connected with the third interface.

With reference to the third implementation manner of the first aspect, in a seventh implementation manner of the first aspect, the normally open end of the first transfer switch is connected to the input end of the voltage regulating device; the output end of the pressure regulating device is respectively connected with the first interface and the second interface; the output end of the voltage regulating device is provided with a voltage detection loop and a current detection loop; the output end of the voltage detection loop is connected with a voltmeter; the output end of the current detection loop is connected with the ammeter.

With reference to the fifth implementation manner of the first aspect, in an eighth implementation manner of the first aspect, one side of the detection box is provided with an ac power socket for accessing an ac external power supply and a dc power socket for accessing a dc external power supply; the alternating current power supply socket is connected with the input end of the alternating current-direct current conversion module through the switch; the direct-current power supply socket is connected with the input end of the direct-current conversion module.

With reference to the eighth implementation manner of the first aspect, in a ninth implementation manner of the first aspect, the embodiment of the disclosure provides at least one fan on the other side of the detection box.

The power distribution unit supplies power to the control unit, the detection unit and the indication unit respectively, the control unit controls the detection unit to detect the contactor and the breaker in the medium-voltage distribution board, a working power supply required by detection is provided, the detection work of the contactor and the breaker can be realized through the detection box, the problems of equipment damage caused by artificial wiring errors and casualties caused by accidental electric shock in the preventive maintenance of the contactor and the breaker of the medium-voltage distribution board in the traditional technical scheme are solved, the detection is convenient and efficient, the operation safety level is high, and various misoperation and accidental injury in the detection process can be effectively avoided;

the control unit controls the detection unit to detect the power distribution drawer, the working state of the power distribution drawer is displayed through the indication unit, the power distribution drawer does not need to be pushed when power transmission verification is carried out by utilizing the detection box, the problem that the power distribution drawer of a low-voltage distribution board needs to be pushed to carry out power transmission verification when fault maintenance is carried out is solved, various hidden dangers brought when the power transmission verification is pushed can be effectively avoided, and voltage and signal fluctuation of the whole-column disk cabinet is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

FIG. 1 is a schematic diagram illustrating an exemplary structure of a detection box according to an embodiment of the present disclosure;

FIG. 2 is an exemplary circuit schematic of a power distribution unit in the detection box shown in FIG. 1;

FIG. 3 is an exemplary circuit schematic of the control unit and the indicating unit in the detection box shown in FIG. 1;

FIG. 4 is an exemplary circuit schematic of a detection cell in the detection box shown in FIG. 1;

FIG. 5 is an exemplary wiring schematic of a second transfer switch in the detection cell shown in FIG. 4;

FIG. 6 is a schematic diagram of an external structure of a detection box according to an embodiment of the present disclosure;

FIG. 7 is a schematic view of a panel structure of the exterior structure of the inspection box shown in FIG. 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows a schematic structural diagram of a detection box provided in an embodiment of the present disclosure, and for convenience of description, only the parts related to the embodiment are shown, which are detailed as follows:

a detection box comprises a power distribution unit 100, a control unit 200, a detection unit 300 and an indication unit 400; a power distribution unit 100 connected to an external power source, for performing voltage conversion on the external power source to supply power; a control unit 200 connected to the power distribution unit 100 for controlling the detection unit 300 to detect; a detection unit 300, respectively connected to the distribution unit 100 and the control unit 200, for detecting a contactor and a breaker in a medium voltage distribution board, and a distribution drawer in a low voltage distribution board; and an indicating unit 400 connected with the power distribution unit 100 for indicating the operating state of the power distribution drawer.

The power distribution unit 100 supplies power to the control unit 200, the detection unit 300 and the indication unit 400 respectively, the control unit 200 controls the detection unit 300 to detect the contactor and the breaker in the medium voltage distribution board, not only is a working power supply required for detecting the contactor and the breaker provided, but also a complete platform is configured for detecting the contactor and the breaker through the detection box, and a test instruction required for detecting the contactor and the breaker is provided to realize the detection work of the contactor and the breaker, so that the problems of equipment damage caused by man-made wiring errors and casualties caused by accidental electric shock in the preventive maintenance of the contactor and the breaker of the medium voltage distribution board in the traditional technical scheme are solved, the detection is convenient and efficient, the operation safety level is high, and various misoperation and accidental injury in the detection process can be effectively avoided; the control unit 200 controls the detection unit 300 to detect the power distribution drawer, the working state of the power distribution drawer is displayed through the indication unit 400, the power distribution drawer does not need to be pushed when power transmission verification is carried out through the detection box, the problem that the power distribution drawer of a low-voltage distribution board needs to be pushed to carry out power transmission verification during fault maintenance is solved, various hidden dangers caused by pushing power transmission verification can be effectively avoided, and voltage and signal fluctuation of an entire row of disk cabinets is reduced.

As shown in fig. 2, in one embodiment, the power distribution unit 100 includes an ac-dc conversion module and a dc-dc conversion module; the alternating current-direct current conversion module is connected with the output end of the external power supply and is used for converting alternating current output voltage of the external power supply into direct current 110V voltage; and the direct current conversion module is connected with the output end of the alternating current-direct current conversion module and is used for converting the output voltage of the alternating current-direct current conversion module into direct current 48V voltage.

Specifically, the external power supply can be divided into a normal alternating current 220V power supply and a 110V external direct current power supply, and the normal alternating current 220V is accessed from the input end of the alternating current-direct current conversion module; the 110V external direct current power supply is accessed from the input end of the direct current conversion module; therefore, under the condition that 220V of alternating current cannot be provided, the direct power supply can be directly supplied by 110V of external direct current. The feed-out power supply is divided into three parts, one part is supplied to the direct current 48V control unit 200, the other part is supplied to the direct current 48V and direct current 110V detection unit 300, and the other part is supplied with power by the direct current 110V and is specially used for the energy storage motor.

As shown in fig. 3, in one embodiment, the control unit 200 includes a first fuse FU1, a first button SB1, a second button SB2, a third button SB3, a fourth button SB4, a first relay KM1, a second relay KM2, a third relay KM3, and a fourth relay KM 4; an output end of the power distribution unit 100 is connected with an input end of the first fuse FU 1; the positive output terminal of the first fuse FU1 is connected to the first terminal of the first button SB1, the first terminal of the second button SB2, the first terminal of the third button SB3, and the first terminal of the fourth button SB4, respectively; a second end of the first button SB1 is connected to a first end of the first relay KM 1; a second end of the second button SB2 is connected to a first end of a second relay KM 2; a second end of the third button SB3 is connected to a first end of a third relay KM 3; a second end of the fourth button SB4 is connected to a first end of the fourth relay KM 4; the negative output end of the first fuse FU1 is connected to the second end of the first relay KM1, the second end of the second relay KM2, the second end of the third relay KM3, and the second end of the fourth relay KM4, respectively.

Specifically, in the medium voltage detection aspect, the first button SB1 is used to control the first relay KM1 to provide an internal working power supply for a contactor or a circuit breaker; the second button SB2 is used for controlling a second relay KM2 to provide a closing operation instruction source for a contactor or a breaker; the third button SB3 is used for controlling a third relay KM3 to provide a switching-off operation instruction source for a contactor or a breaker; the fourth button SB4 is used to control the fourth relay KM4, so as to provide working power supply for the energy storage motor when the circuit breaker is detected.

In the aspect of low voltage detection, the first button SB1 is used for controlling the first relay KM1 to provide 110V direct current working power supply for the power distribution drawer; the second button SB2 is used for controlling the second relay KM2 to provide DC48V control loop working power supply for the distribution drawer; the third button SB3 is used for controlling a third relay KM3 to provide an operation source of a switching-off instruction for the distribution drawer; the fourth button SB4 is used to control the fourth relay KM4 to provide a source of closing command operation for the distribution drawer.

As shown in fig. 3, in one embodiment, the indicating unit 400 includes a first indicator light L a1, a second indicator light L a2, a third indicator light L A3, and a fifth button SB5, a first end of the fourth button SB4 is connected to an input end of the fifth button SB5, a first end of the first indicator light L a1, a first end of the second indicator light L a2, and a first end of the third indicator light L A3, a third interface J3 is connected to an output end of the fifth button SB5, a second end of the first indicator light L a1, a second end of the second indicator light L a2, and a second end of the third indicator light L A3, and a second end of the fourth relay KM4 is connected to the third interface J3.

Specifically, the first indicator light L A1 is used for indicating that the working state of the power distribution drawer is normal, the second indicator light L A2 is used for indicating that the working state of the power distribution drawer is fault, the third indicator light L A3 is used for indicating total fault alarm of the power distribution drawer, if the power distribution drawer is in an electric actuator configuration power distribution drawer detection mode, the fifth button SB5 is pressed, otherwise, the fifth button SB5 is reset, the third interface J3 is a quick interface used for power distribution drawer detection of the detection box configuration, the quick interface can be quickly butted with an aviation plug composed of connecting wires corresponding to the power distribution drawer through the quick interface, and therefore detection efficiency can be effectively improved, and various misoperation occurring in the detection process can be reduced.

As shown in fig. 4, in one embodiment, the detecting unit 300 includes a medium voltage detecting unit 310 and a low voltage detecting unit 320; a medium voltage detection unit 310 connected to the distribution unit 100 and the control unit 200, respectively, for preventive maintenance of contactors and circuit breakers in the medium voltage distribution board; and a low voltage detection unit 320 connected to the distribution unit 100, the control unit 200, and the medium voltage detection unit 310, respectively, for troubleshooting a distribution drawer in the low voltage distribution board.

Specifically, the power distribution unit 100 supplies power to each unit, and the control unit 200 controls the medium voltage detection unit 310 to perform preventive maintenance work on contactors and circuit breakers in the medium voltage distribution board; the control unit 200 controls the low voltage detection unit 320 to carry out fault maintenance work on the distribution drawers in the low voltage distribution board; the maintenance work is divided into definite time, various misoperation possibly caused in the detection process is avoided, and the safety of personnel and equipment can be improved.

As shown in fig. 4, in one embodiment, the low voltage detecting unit 320 includes a third fuse FU3 and a third interface J3; an output end of the power distribution unit 100 is connected with an input end of the third fuse FU 3; the output end of the third fuse FU3 is respectively connected with the first end of a second normally open contact KM2-2 of the second relay, the first end of a second normally open contact KM3-2 of the third relay and the first end of a second normally open contact KM4-2 of the fourth relay; the third interface J3 is respectively connected with the second end of the second normally open contact KM2-2 of the second relay, the second end of the second normally open contact KM3-2 of the third relay and the second end of the second normally open contact KM4-2 of the fourth relay; a normally closed terminal of the first changeover switch SW1 is connected to the third interface J3.

Specifically, the third interface J3 is a quick interface for detecting the distribution drawer configured by the detection box, and can be quickly butted with an aviation plug formed by corresponding connecting wires from the distribution drawer through the quick interface, so that the detection efficiency can be effectively improved, and various misoperation in the detection process can be reduced.

As shown in fig. 4, in one embodiment, the medium voltage detecting unit 310 includes a second fuse FU2, a first switch SW1, a second switch SW2, a first interface J1, and a second interface J2; an output end of the power distribution unit 100 is connected with an input end of the second fuse FU 2; the output end of the second fuse FU2 is respectively connected with the first end of a first normally open contact KM1-1 of the first relay, the first end of a first normally open contact KM2-2 of the second relay, the first end of a first normally open contact KM3-1 of the third relay and the first end of a first normally open contact KM4-1 of the fourth relay; the second end of the first normally open contact KM1-1 of the first relay is connected with the common end of the first transfer switch SW 1; the normally open end of the first switch SW1 is connected with the first interface J1 and the second interface J2 respectively; the second end of the first normally open contact KM2-1 of the second relay is connected with the input end of a second transfer switch SW 2; the output end of the second switch SW2 is respectively connected with the first interface J1 and the second interface J2; the second end of the first normally open contact KM3-1 of the third relay is respectively connected with the first interface J1 and the second interface J2; the second end of the first normally open contact KM4-1 of the fourth relay is respectively connected with the first interface J1 and the second interface J2.

Specifically, the first transfer switch SW1 switches the 110V direct current output from the second end of the first normally open contact KM1-1 of the first relay, and when the detection in the medium voltage aspect is performed, the first transfer switch SW1 is switched to close the normally open contact, so as to provide a direct current 110V working power supply for a contactor or a circuit breaker test; when the low-voltage detection is carried out, the first transfer switch SW1 is switched to close the normally closed contact of the first transfer switch, so that a direct-current 110V working power supply is provided for the power distribution drawer test; although the DC 110V working power supply is shared by the medium-voltage detection and the low-voltage detection, the power supply is separately supplied when different tests are carried out, so that the safety of power utilization is improved.

The second transfer switch SW2 is used for rotating the second transfer switch SW2 to a state that a closing terminal of the nuclear-grade contactor is in a short circuit state if the contactor is in a nuclear grade during the detection of the contactor in the medium voltage aspect; if the contactor is in the non-nuclear grade, the second change-over switch SW2 is rotated to a state that the closing terminal of the nuclear grade contactor and the second end of the first normally open contact KM2-1 of the second relay are in a connection state; the wiring principle is shown in fig. 5.

The first interface J1 is a quick interface for detecting a contactor configured in the detection box, and can be quickly butted with an aviation plug formed by corresponding connecting wires in a medium-voltage distribution board through the quick interface, so that the detection efficiency can be effectively improved, and various misoperation in the detection process can be reduced. The quick interface used for detecting the breaker of the second interface J2 detection box configuration can be in quick butt joint with an aviation plug formed by corresponding connecting wires in a medium voltage distribution board through the quick interface, so that the detection efficiency can be effectively improved, and various misoperation in the detection process can be reduced. The difference between the first interface J1 and the second interface J2 is: a second interface J2, namely an interface used for detecting the circuit breaker, is provided with a connection wire of a loop for supplying power to the energy storage motor; the first interface J1 is a six-pin quick interface, and the second interface J2 is an eight-pin quick interface.

In one embodiment, the normally open end of the first switch SW1 is connected to the input end of the voltage regulating device; the output end of the voltage regulating device is respectively connected with the first interface J1 and the second interface J2; the output end of the voltage regulating device is provided with a voltage detection loop and a current detection loop; the output end of the voltage detection loop is connected with a voltmeter; the output end of the current detection loop is connected with the ammeter.

Specifically, because the switching action characteristic of the contactor needs to output the highest direct current 110V voltage and the lowest direct current 95V voltage, a voltage and current detection loop is added in a contactor power supply loop, and the voltage and current values in the contactor power supply loop are displayed by matching with an intelligent digital display ammeter, so that the switching action test of the contactor is facilitated; the additional pressure regulating device is of a knob type, can be regulated according to different voltage requirements, and is convenient to use.

In one embodiment, one side of the detection box is provided with an alternating current power supply socket for accessing an alternating current type external power supply and a direct current power supply socket for accessing a direct current type external power supply; the alternating current power supply socket is connected with the input end of the alternating current-direct current conversion module through the switch; the direct-current power supply socket is connected with the input end of the direct-current conversion module.

Specifically, the alternating current power supply socket is used for accessing an alternating current type external power supply of alternating current 220V, and alternating current 220V alternating current is converted into direct current of direct current 110V through the alternating current-direct current conversion module; the direct-current power socket is used for being connected with a direct-current type external power supply of direct current 110V, and the direct-current 110V direct current is converted into direct current of direct current 48V through the direct-current conversion module.

In one embodiment, as shown in FIG. 6, at least one FAN FAN is provided on the other side of the detection box.

Specifically, the FAN is used for removing heat generated by the work inside the detection box, reducing the temperature of the working environment of the detection box and improving the working reliability.

In one embodiment, as shown in fig. 6, the first interface J1, the second interface J2 and the third interface J3 are fixed on the top of the detection box, the ac power socket and the switch for controlling the ac power are located on one side of the detection box, the operation panel 500 is located on one side of the detection box, and as shown in fig. 7, the operation panel 500 is mainly provided with a first switch SW1, a second switch SW2, a first indicator light L a1, a second indicator light L a2 and a third indicator light L A3.

In one embodiment, in order to solve the problem that a control power supply is taken from a cabinet outside a preventive maintenance panel of a medium-voltage 6.3KV switch cabinet in a certain nuclear power plant, the system is integrated and converted according to different classifications of contactors, for example, the system is divided into an non-nuclear-level contactor and a nuclear-level contactor according to the types of contactors, the two types of contactors have the same control mode, and the only difference is that the non-nuclear-level contactor needs to connect No. 4 and No. 14 switching-on terminals into a 110V direct-current power supply, and the nuclear-level contactor only needs to short-circuit the two terminals, so that in the detection box disclosed by the system, the detection and maintenance of the two different contactors can be met only by enabling the No. 4 and No. 14; the mechanical holding contactor is divided into an electric holding contactor and a mechanical holding contactor according to different control modes of the contactors, and the two contactors are different in that the mechanical holding contactor lacks a switching-off control command, namely, direct-current 110V voltage is input to No. 11 and No. 21 switching-off terminals, so that mechanical switching-off control can be realized; to sum up, this part is one of the problems that need not only distinguish between the maintenance test activities of different types of contactors and need unified processing and solution through the detection case that this application discloses.

In one embodiment, because an aviation plug (hereinafter referred to as an aviation plug) of a contactor is inconsistent with an aviation plug structure and a control mode of a breaker, the design is mainly to integrate two different aviation plugs, and researches show that the contactor and the breaker share power supply for power supply, power terminals No. 5 and No. 15 of the contactor correspond to power terminals No. 49 and No. 20 of the breaker, opening terminals 11 and 21 (mechanical holding) of the contactor correspond to opening terminals No. 31 and No. 30 of the breaker, and closing command terminals No. 4 and No. 14 of the contactor correspond to closing

terminals

4 and 14 of the breaker; the difference between the two methods is that a direct current working power supply is required to be separately provided for the energy storage motor during the fault detection of the circuit breaker. This part is one of the problems that need distinguish between the contactor that the detection case disclosed in this application met in the design process and the circuit breaker and need unified solution again.

In one embodiment, the control of the power supply drawer in the low-voltage 380V switch cabinet is relatively complex and has more internal related components, wherein the important thing is power supply and feedback, the power supply and feedback are embodied in the wiring mode in the drawer, although the number of the wiring plugs of different types of drawers can be different, the indication on the plugs is the same, in order to verify the point, by looking up the power supply drawers with different control modes, the number 11 and 12 terminals of all the power supply drawers are found to correspond to 110V direct current, the number 17 and 18 terminals correspond to 48V direct current, the number 1, 2 and 3 terminals correspond to automatic command on-off or on-off, the number 13, 14 and 9 terminals correspond to signals (normal and fault) fed back to the outside by the drawer, the number 7 and 8 terminals correspond to total fault alarm, and the number 4, 5 and 6 terminals correspond to the drawer state fed back to the outside (for the electric actuator control drawer, the valve is in place, The valve is closed in place, other actuating drawers are stopped/unavailable and run), the No. 21, 22 and 23 terminals are only available on the drawer of the electric actuating mechanism, are states inside the electric actuating mechanism (like 4, 5 and 6) and play a role of connecting or disconnecting to transmit a drawer state indicator lamp, and the No. 25, 26, 27 and 28 terminals are only located in the electric actuating mechanism and play a role of connecting or disconnecting/starting or disconnecting the positive contactor and the negative contactor. Through the decomposition, the number of the terminals related to most of the power supply drawers with low voltage of 380V is 1-9, 11-14, 17-18, and the number of the terminals 20-28 only exist in the electric actuator. In order to meet the universality of the detection box, the detection box is designed by taking a drawer schematic diagram of an electric actuating mechanism as a blue book. As mentioned above, the power supply and the feedback are important in the power supply drawer detection and maintenance process, so the detection box of the present application not only needs to provide a proper power supply, but also needs to send a command signal and receive a feedback signal through the detection box to perform the switching on and off operations to perform the functions of fault detection and indication.

In one embodiment, when the electric hold type contactor test is performed, the first transfer switch SW1 is opened to the medium-voltage level, namely, the normally open contact of the first transfer switch SW1 is closed; the second transfer switch SW2 is turned on to the type of contactor that needs to be tested: if the non-nuclear-grade contactor is adopted, the second transfer switch SW2 is switched to a state that the closing terminal of the nuclear-grade contactor is in short circuit; if the contactor is in the non-nuclear grade, the second change-over switch SW2 is rotated to a state that the closing terminal of the nuclear grade contactor and the second end of the first normally open contact KM2-1 of the second relay are in a connection state; then the power switch is turned on, the first button SB1 is pressed, the first button SB1 is self-held, the power module in the contactor is electrified, the second button SB2 is pressed, the second button SB2 is self-held, the control loop in the contactor is electrified, and the contactor is switched on.

When the mechanical holding type contactor test is carried out, the first button SB1 is pressed, the first button SB1 is self-held, the internal power supply module of the contactor is electrified, the second button SB2 is pressed, the second button SB2 is self-held, the internal control circuit of the contactor is electrified, the second button SB2 is pressed again, the second button SB2 is reset, the contactor is in a self-holding closing state and needs to be opened, and the third button SB3 is pressed, so that the contactor is opened.

When a breaker test is carried out, the first transfer switch SW1 is opened to a medium-voltage level, namely a normally open contact of the first transfer switch SW1 is closed, the second transfer switch SW2 is rotated to a breaker position needing the test, namely the second transfer switch SW2 is rotated to a state that a closing terminal of the breaker and a second end of a first normally open contact KM2-1 of a second relay are in a connected state; then the power supply is switched on, the fourth button SB4 is pressed, the energy storage motor is powered on, the first button SB1 is pressed, the first button SB1 is self-retaining, the power supply module in the circuit breaker is powered on, the second button SB2 is pressed, the second button SB2 is self-retaining, or an external switch action characteristic tester supplies a closing command, the circuit breaker is closed, the second button SB2 is pressed again, and the second button SB2 is reset. When the switch is opened, the third button SB3 is pressed, the third button SB3 is self-held, or an external switch operation characteristic tester supplies a switch-off command, the breaker is opened, the third button SB3 is pressed again, and the third button SB3 is reset.

In one embodiment, when a normal distribution drawer inspection is carried out, the first change-over switch SW1 is turned to a low-voltage gear, namely, the first change-over switch SW1 is switched to be closed at a normally closed contact, a navigation plug inserted into a drawer cabinet is connected with a third interface J3 of the detection box, a power switch is turned on, a first button SB1 is pressed, a first button SB1 is self-held and supplies 110VDC power, a second button SB2 is pressed, a second button SB2 is self-held and supplies 48VDC power, a fourth button SB4 is pressed if the drawer needs to be closed, a fourth button SB4 is held, a closing command is sent to the drawer (the drawer is required to be closed clearly in advance, whether a closing command received by the drawer is a pulse signal or a continuous signal, the fourth button SB2 is pressed again and restored if the drawer is the pulse signal, a third button SB3 is pressed, the drawer is required to be opened, the drawer is opened, and after the drawer is opened, a first indicator light panel 500A, a first indicator light L A, a lamp 1A is turned on, a fault indicator light L A is visible as a fault indicator light status of the drawer L A L, and a drawer is not available.

When a loop drawer (an electric execution structure power supply drawer) with positive and negative contactors is detected, a first change-over switch SW1 is switched to a low-voltage level, a third interface J3 is plugged to be connected with a corresponding aviation plug of a drawer cabinet, a power supply is switched on, a first button SB1 is pressed, and the first button SB1 is self-maintained and supplies 110VDC power; pressing the second button SB2, the second button SB2 is self-holding, and supplies DC48V power; pressing the fifth button SB5, the fifth button SB5 is self-holding; pressing the fourth button SB4 to switch on the positive contactor, pressing the fourth button SB4 again to restore the fourth button SB4 to switch off the positive contactor; when the fifth button SB5 is pressed again, the fifth button SB5 is restored, the third button SB3 is pressed, the reverse contactor is closed, the third button SB3 is released, and the reverse contactor is opened.

The detection box provided by the disclosure can be used for solving the fault detection work of all drawers of a low-voltage plate special for certain nuclear power, can accurately detect the fault points of components inside the drawers, can ensure the wiring accuracy of medium-voltage equipment when the medium-voltage plate cabinet is maintained in advance, ensures the stability of the equipment in the preventive maintenance process, and reduces the probability of human error.

In summary, the power distribution unit 100 in the detection box provided by the present disclosure supplies power to the control unit 200, the detection unit 300, and the indication unit 400, and the control unit 200 controls the detection unit 300 to detect the contactor and the breaker in the medium voltage distribution board, so that not only is a working power supply required for detection provided, but also the detection work of the contactor and the breaker can be realized through the detection box, thereby solving the problems of equipment damage caused by human wiring errors and casualties caused by accidental electric shock in the preventive maintenance of the contactor and the breaker of the medium voltage distribution board in the conventional technical scheme, having the advantages of convenient and efficient detection, high operation safety level, and effectively avoiding various false operations and accidental injuries in the detection process;

the control unit 200 controls the detection unit 300 to detect the power distribution drawer, the working state of the power distribution drawer is displayed through the indication unit 400, the power distribution drawer does not need to be pushed when power transmission verification is carried out through the detection box, the problem that the power distribution drawer of a low-voltage distribution board needs to be pushed to carry out power transmission verification during fault maintenance is solved, various hidden dangers caused by pushing power transmission verification can be effectively avoided, and voltage and signal fluctuation of an entire row of disk cabinets is reduced.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A test kit, comprising:

the power distribution unit is connected with an external power supply and used for performing voltage conversion on the external power supply to supply power;

the control unit is connected with the power distribution unit and used for controlling the detection unit to detect;

the detection unit is respectively connected with the power distribution unit and the control unit and is used for detecting a contactor and a circuit breaker in a medium-voltage distribution board and a power distribution drawer in a low-voltage distribution board; and

and the indicating unit is connected with the power distribution unit and is used for indicating the working state of the power distribution drawer.

2. The test box of claim 1, wherein the control unit comprises a first fuse, a first button, a second button, a third button, a fourth button, a first relay, a second relay, a third relay, and a fourth relay;

one output end of the power distribution unit is connected with the input end of the first fuse wire; the positive output end of the first fuse wire is respectively connected with the first end of the first button, the first end of the second button, the first end of the third button and the first end of the fourth button; the second end of the first button is connected with the first end of the first relay; the second end of the second button is connected with the first end of the second relay; the second end of the third button is connected with the first end of the third relay; the second end of the fourth button is connected with the first end of the fourth relay; and the negative output end of the first fuse wire is respectively connected with the second end of the first relay, the second end of the second relay, the second end of the third relay and the second end of the fourth relay.

3. The test cassette of claim 2, wherein the test unit comprises:

the medium voltage detection unit is respectively connected with the power distribution unit and the control unit and is used for preventive maintenance of a contactor and a circuit breaker in a medium voltage distribution board; and

and the low-voltage detection unit is respectively connected with the power distribution unit, the control unit and the medium-voltage detection unit and is used for fault maintenance of the power distribution drawer in the low-voltage distribution board.

4. The test box of claim 3, wherein the medium voltage test unit comprises a second fuse, a first transfer switch, a second transfer switch, a first interface, and a second interface;

one output end of the power distribution unit is connected with the input end of the second fuse wire; the output end of the second fuse wire is respectively connected with the first end of the first normally open contact of the first relay, the first end of the first normally open contact of the second relay, the first end of the first normally open contact of the third relay and the first end of the first normally open contact of the fourth relay; a second end of a first normally open contact of the first relay is connected with a common end of the first transfer switch; the normally open end of the first change-over switch is connected with the first interface and the second interface respectively; the second end of the first normally open contact of the second relay is connected with the input end of the second change-over switch; the output end of the second change-over switch is respectively connected with the first interface and the second interface; a second end of a first normally open contact of the third relay is connected with the first interface and the second interface respectively; and the second end of the first normally open contact of the fourth relay is connected with the first interface and the second interface respectively.

5. The detection box of claim 4, wherein the low voltage detection unit comprises a third fuse and a third interface;

one output end of the power distribution unit is connected with the input end of the third fuse wire; the output end of the third fuse wire is respectively connected with the first end of the second normally open contact of the second relay, the first end of the second normally open contact of the third relay and the first end of the second normally open contact of the fourth relay; the third interface is respectively connected with a second end of a second normally open contact of the second relay, a second end of a second normally open contact of the third relay and a second end of a second normally open contact of the fourth relay; and the normally closed end of the first change-over switch is connected with the third interface.

6. The test box of claim 5, wherein the power distribution unit comprises:

the alternating current-direct current conversion module is connected with the output end of the external power supply and is used for converting alternating current output voltage of the external power supply into direct current 110V voltage; and

and the direct current conversion module is connected with the output end of the alternating current-direct current conversion module and is used for converting the output voltage of the alternating current-direct current conversion module into direct current 48V voltage.

7. The test box according to claim 6, wherein the indicating unit comprises a first indicating lamp, a second indicating lamp, a third indicating lamp and a fifth button;

the first end of the fourth button is respectively connected with the input end of the fifth button, the first end of the first indicator light, the first end of the second indicator light and the first end of the third indicator light; the third interface is respectively connected with the output end of the fifth button, the second end of the first indicator light, the second end of the second indicator light and the second end of the third indicator light; and the second end of the fourth relay is connected with the third interface.

8. The test box of claim 4, wherein the normally open end of the first transfer switch is connected to the input end of the voltage regulating device; the output end of the pressure regulating device is respectively connected with the first interface and the second interface; the output end of the voltage regulating device is provided with a voltage detection loop and a current detection loop; the output end of the voltage detection loop is connected with a voltmeter; and the output end of the current detection loop is connected with an ammeter.

9. The test box according to claim 6, wherein one side of the test box is provided with an ac power socket for accessing an ac type external power supply and a dc power socket for accessing a dc type external power supply; the alternating current power supply socket is connected with the input end of the alternating current-direct current conversion module through a switch; the direct-current power supply socket is connected with the input end of the direct-current conversion module.

10. The test box of claim 9, wherein the other side of the test box is provided with at least one fan.