CN219496487U - General test power supply of block terminal - Google Patents

Abstract

The utility model relates to a general test power supply for a distribution box, which comprises a shell, wherein a transverse contact voltage regulator is arranged on one side of the interior of the shell, an adjustable leakage current generating circuit is arranged on the other side of the interior of the shell, an operation panel is arranged on the front side of the shell, an input-output short-circuit protector is arranged in the middle of the rear side of the shell, a phase sequence detection switching circuit is arranged in the middle of the shell, the input-output short-circuit protector comprises an input short-circuit protection interface and an output short-circuit protection interface, an external power supply is introduced through the input short-circuit protection interface, the modulated current is output through the output short-circuit protection interface, all electric appliances are electrically connected, the leakage protection test for the distribution box is rapidly completed, the output phase sequence of the distribution box to be tested is detected through a panel phase sequence switching knob, whether the distribution box to be tested can identify a phase sequence error power supply state or not is detected, the protection action is carried out, the test operation function is concentrated on the operation panel, and the general test power supply is visual and convenient to operate.

Description

General test power supply of block terminal

Technical Field

The utility model relates to the field of power supplies of distribution boxes, in particular to a universal test power supply of a distribution box.

Background

When the power distribution cabinet products are debugged in a factory, a series of tests such as a first power-on test, an input overvoltage and undervoltage test, an input phase sequence abnormal alarm function test, an input open-phase alarm function test, a leakage current protection function test and the like are generally required. In order to meet the debugging requirement, debugging personnel are required to prepare equipment such as a three-phase voltage regulator, a circuit breaker, a voltmeter, a clamp flow meter and the like and build a temporary test bench. The process is tedious and complex, the requirements on the practical ability of the testers are very high, the testing process is not standard enough, and many abnormal states cannot be effectively controlled to cause accidents.

Patent document with publication number CN217282715U discloses a driving power supply, which comprises a driving module, a voltage regulating module, get electric module and switch module, voltage regulating module's input is used for being connected with external power source, voltage regulating module's output is used for being connected with the load, driving module's output is connected with voltage regulating unit in order to control voltage regulating unit work, get electric module's input is connected with voltage regulating module's output, get electric module's output is connected with driving module's power supply end switch module and drive module's power supply end, switch module's one end is connected with voltage regulating module's input, switch module's the other end is connected with driving module's power supply end and switch module is connected with getting electric module in order to form the trigger signal according to getting electric module's output, switch module can switch in on state or off state according to the trigger signal. The utility model can reduce the power loss of the driving power supply.

The device has the following defects that the device is not suitable for being used in a distribution box, various test requirements of the distribution box cannot be met, other test electric appliances are required to be installed, the device lacks a leakage current output module, the leakage current protection function of the distribution box cannot be detected, and the function is less.

Disclosure of Invention

Aiming at the requirements in the background technology, the utility model provides a universal test power supply for a distribution box, which is used for carding and classifying test items commonly used in distribution box debugging, decomposing common test requirements, standardizing test flow, improving the working efficiency of testers, reducing the working difficulty and the working strength, and providing standard and convenient test functions.

The technical problems solved by the utility model are as follows:

(1) The device is not suitable for being used in a distribution box, various test requirements of the distribution box cannot be met, and other test electric appliances are required to be installed;

(2) The device lacks a leakage current output module, cannot detect the leakage current protection function of the distribution box, and has fewer functions.

The aim of the utility model can be achieved by the following technical scheme: the utility model provides a general test power supply of block terminal, which comprises a housing, horizontal contact voltage regulator is installed to inside one side of casing, adjustable leakage current generation circuit is installed to the inside opposite side of casing, operating panel is installed to the front side of casing, the rear side mid-mounting of casing has input output short-circuit protector, the mid-mounting of casing has phase sequence to detect switching circuit, input output short-circuit protector includes input short-circuit protection interface and output short-circuit protection interface, introduce external power supply through input short-circuit protection interface, output through output short-circuit protection interface with the current output that modulates, equal electric connection between each electrical apparatus.

Preferably, a leakage current adjusting knob is arranged on one side of the operation panel close to the adjustable leakage current generating circuit, and an output voltage adjusting knob is arranged on one side of the operation panel close to the transverse contact voltage regulator.

Preferably, a voltage regulating coil and an insulating base are arranged in the transverse contact voltage regulator, the voltage regulating coil is fixed through the insulating base, a plurality of support columns are arranged between the insulating bases around the voltage regulating coil, the insulating base is connected with the bottom surface, the side surface and the rear wall of the chassis through bolts, the middle of the voltage regulating coil is penetrated through a rotating shaft, the rotating shaft extends out of the front panel and is connected with an output voltage regulating knob, an insulating slip ring is designed at the joint of the rotating shaft and the front panel, an air duct is formed at the position of the voltage regulating coil by the transverse contact voltage regulator, and a fan is arranged in the air duct.

Preferably, the operation panel is located one side of leakage current adjust knob and installs leakage current display screen, and the downside that is located leakage current display screen on the operation panel is installed leakage current test socket, and leakage current test socket includes 30mA test socket and 300mA test socket.

Preferably, an output voltage display screen is installed on one side, close to the output voltage adjusting knob, of the operation panel, phase-failure control buttons are installed on the lower side, located on the output voltage display screen, of the operation panel, three phase-failure control buttons are arranged, the three phase-failure control buttons correspond to a phase-failure A phase, a phase-failure B phase and a phase-failure C phase respectively, and the three phase-failure control buttons are electrically connected with the input-output short-circuit protector respectively.

Preferably, a phase sequence switching knob is installed on the upper side of the output voltage display screen on the operation panel, and the phase sequence switching knob is electrically connected with the phase sequence switching module.

Preferably, a single-phase input voltage display screen is arranged on the upper side of the middle part of the operation panel, a grounding column is arranged on one side of the operation panel, which is positioned on the leakage current test socket, and a five-port socket is arranged in the center of the middle part of the operation panel.

Preferably, the two ends of the rear side of the casing are provided with radiating holes for radiating heat for each heating device in the casing, and the radiating holes at one end are provided with radiating fans.

Preferably, an input wire bundle groove is arranged at the rear side of the casing and below the input/output short-circuit protector, and an output wire bundle groove is arranged at the lower side of the middle part of the operation panel.

The beneficial effects of the utility model are as follows:

(1) Aiming at the distribution box to be debugged just assembled, the first power-on needs to be gradually increased from 0V to rated voltage, the AC380V of the commercial power input by an input short-circuit protection interface is converted into continuous adjustable alternating current output through a transverse contact voltage regulator, the power supply and detection control action needs of a secondary circuit of the distribution box under the empty load state are met, 20 mA-370 mA continuous adjustable current is generated through an adjustable leakage current generating circuit, the 30mA leakage current protection function and the 300mA leakage current protection function which are commonly used for electrical equipment are detected, the short-circuit problem occurring in the input and output processes of the device is protected through an input/output short-circuit protector, the leakage current protection function, the output input voltage display function and the single-phase breaking function are respectively detected through operation on an operation panel, so that all main functions of the distribution box are rapidly and accurately detected, meanwhile, the power supply is assembled for the distribution box when leaving the factory, so that the distribution box can be quickly installed at a working position, time and labor are saved, the transverse contact voltage regulator breaks through the three-layer stacking mode of the traditional contact voltage regulator, the whole volume is compressed, the adjustable leakage current generating circuit realizes wide-range current adjustment of 20 mA-370 mA by using a set of small-power disc-type sliding resistors, the weight of equipment is reduced, the device compresses the unnecessary volume according to actual conditions, the volume of the equipment to the standard 3U plug box with the depth of 19 inches and 300mm, the device can be placed on an operation desk or installed in a standard 19 inch cabinet, the traditional terminal wiring is abandoned, the replaceable quick interface is adopted for electric connection with the distribution box to be tested, the replacement is convenient after the interface is worn, the design weight of the device is 16kg, and a single person does not need to assist in moving, the whole work efficiency is improved, the device is used for testing the operation function and is concentrated on the operation panel, and the device is simple, visual and convenient to operate.

(2) The leakage current test socket comprises a 30mA test socket and a 300mA test socket, and is used for providing 20-40 mA adjustable current for the common 30mA and 300mA leakage protector of the distribution box and verifying whether the protection action of the 30mA leakage protector in the distribution box is normal or not; the 300mA test socket can provide 40-370 mA adjustable current for verify whether the protection action of 300mA earth leakage protector in the block terminal is normal, show the size of leakage current through leakage current display screen, insert this power supply into the block terminal input that awaits measuring, use the probe of taking banana plug, insert leakage current test socket with the probe, the probe is put through with the N line of the arbitrary node in block terminal earth leakage protection equipment rear end that awaits measuring, can produce leakage current: inserting a probe plug into a 30mA test socket, enabling the probe to be in contact with N at the output end of the distribution box, observing a leakage current display screen, and then adjusting a leakage current adjusting knob to enable leakage current to be adjusted within a range of 20 mA-40 mA, and observing whether the distribution box to be tested protects the leakage current within the range; the probe plug is inserted into the 300mA test socket, the probe is contacted with N of the output end of the distribution box, a leakage current display screen is observed, a leakage current adjusting knob is adjusted, leakage current can be adjusted within a range of 40 mA-365 mA, whether the distribution box to be tested protects the leakage current within the range or not is observed, so that the leakage protection test for the distribution box is completed rapidly.

Drawings

The present utility model is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of the overall structure of the operation panel of the present utility model;

FIG. 3 is a rear elevational view of the overall structure of the present utility model;

FIG. 4 is an overall circuit diagram of the present utility model;

FIG. 5 is a flow chart of the operation of the present utility model;

in the figure: 1. a transverse contact voltage regulator; 2. an adjustable leakage current generation circuit; 3. an input/output short-circuit protector; 4. an operation panel; 5. a phase sequence detection switching circuit; 6. a housing; 31. inputting a short-circuit protection interface; 32. outputting a short-circuit protection interface; 33. a heat radiation fan; 401. a leakage current adjusting knob; 402. a leakage current display screen; 403. a leakage current test socket; 404. a single-phase input voltage display screen; 405. an output voltage adjustment knob; 406. outputting a voltage display screen; 407. a phase loss control button; 408. a phase sequence switching knob; 409. a grounding column; 410. an output wire bundle slot; 411. a five-port socket; 412. an input wire bundle slot.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

Please refer to fig. 1-5: the utility model provides a general test power supply of block terminal, including casing 6, horizontal contact voltage regulator 1 is installed to the inside one side of casing 6, leak current generation circuit 2 with adjustable the inside opposite side of casing 6 is installed, operating panel 4 is installed to the front side of casing 6, input output short-circuit protector 3 is installed to the rear side mid-mounting of casing 6, phase sequence detection switching circuit 5 is installed to the mid-mounting of casing 6, input output short-circuit protector 3 includes input short-circuit protection interface 31 and output short-circuit protection interface 32, introduce external power supply through input short-circuit protection interface 31, output with the current output that modulates through output short-circuit protection interface 32, equal electric connection between each electrical apparatus.

In this embodiment, for the distribution box to be debugged just assembled, the first power-on needs to be gradually increased from 0V to rated voltage, the AC380V of the commercial power input by the input short-circuit protection interface 31 is converted into continuously adjustable alternating current output through the transverse contact voltage regulator 1, the power supply and detection control action needs of the secondary circuit of the distribution box in the empty load state are met, 20 mA-370 mA continuously adjustable current is generated through the adjustable leakage current generating circuit 2, the 30mA leakage current protection function and 300mA leakage current protection function which are commonly used for electrical equipment are detected, the short-circuit problem occurring in the input and output processes of the device is protected through the input and output short-circuit protector 3, the leakage current protection function, the output input voltage display function and the single-phase circuit breaking function are respectively detected through operation on the operation panel 4, so that all main functions of the distribution box are detected quickly and accurately, meanwhile, the distribution box is assembled with a power supply in the factory, and the distribution box can be quickly installed to a working position, and time and labor are saved.

A leakage current adjusting knob 401 is arranged on one side of the operation panel 4 close to the adjustable leakage current generating circuit 2, and an output voltage adjusting knob 405 is arranged on one side of the operation panel 4 close to the transverse contact voltage regulator 1;

be equipped with voltage regulating coil and insulating base in the horizontal contact voltage regulator 1, fixed voltage regulating coil through insulating base, set up a plurality of pillars fixedly around voltage regulating coil between each insulating base, keep relatively stable between the coil, voltage regulating coil is horizontal, and support and protect with quick-witted case bottom surface and side through insulating base, pass through bolted connection with quick-witted case bottom surface, side and back wall, pass through the pivot in the middle of the voltage regulating coil, the pivot stretches out the front panel and links to each other with output voltage adjust knob 405, the pivot links to each other department with the front panel and designs insulating sliding ring, air flue is seted up in voltage regulating coil department to horizontal contact voltage regulator 1 simultaneously, be equipped with the fan in the inside and force the cooling, prevent that the coil during operation from overheated, horizontal contact voltage regulator 1 breaks through the three-layer stack form of contact voltage regulator in the past, holistic volume has been compressed.

A leakage current display screen 402 is arranged on one side of the operation panel 4, which is positioned on the leakage current adjusting knob 401, a leakage current test socket 403 is arranged on the lower side of the leakage current display screen 402 on the operation panel 4, the leakage current test socket 403 comprises a 30mA test socket and a 300mA test socket, aiming at the common 30mA and 300mA leakage protectors of the distribution box, the 30mA test socket is used for providing 20-40 mA adjustable current and is used for verifying whether the protection action of the 30mA leakage protector in the distribution box is normal or not; the 300mA test socket can provide 40-370 mA adjustable current for verifying whether the protection action of a 300mA leakage protector in the distribution box is normal or not, and the magnitude of leakage current is displayed through the leakage current display screen 402;

during leakage protection test, the test operation is simple, and any bypass is not required to be lapped on the distribution box to be tested: the power supply is connected to the input end of the distribution box to be tested, the probe with the banana plug is used, the probe is inserted into the leakage current test socket 403, the probe is connected with the N line of any node at the rear end of the distribution box leakage protection device to be tested, and leakage current can be generated: inserting a probe plug into a 30mA test socket, enabling the probe to be in contact with N of an output end of the distribution box, observing a leakage current display screen 402, and then adjusting a leakage current adjusting knob 401 to enable leakage current to be adjusted within a range of 20 mA-40 mA, and observing whether the distribution box to be tested protects the leakage current within the range; and then the probe plug is inserted into a 300mA test socket, the probe is contacted with N of the output end of the distribution box, a leakage current display screen 402 is observed, a leakage current adjusting knob 401 is adjusted, leakage current can be adjusted within a range of 40 mA-365 mA, whether the distribution box to be tested protects the leakage current within the range or not is observed, and therefore leakage protection test for the distribution box is completed.

The adjustable leakage current generating circuit 2 uses a set of small-power disc-type sliding resistors to realize wide-range current adjustment of 20 mA-370 mA, and reduces the weight of equipment, as in the circuit of the device shown in fig. 4, the adjustable leakage current generating circuit 2 utilizes the voltage of a measuring loop, a relay in a driving circuit automatically adjusts the series-parallel connection of the circuit, carries out voltage division on the sliding rheostat twice, and the front end and two rear end circuits of the sliding rheostat are connected in series with specific fixed-value resistors to reduce the voltage at the two ends of the sliding rheostat.

An output voltage display screen 406 is arranged on one side, close to the output voltage adjusting knob 405, of the operation panel 4, phase-failure control buttons 407 are arranged on the lower side, located on the output voltage display screen 406, of the operation panel 4, three phase-failure control buttons 407 are arranged, the three phase-failure control buttons 407 correspond to a phase-failure A phase, a phase-failure B phase and a phase-failure C phase respectively, and the three phase-failure control buttons 407 are electrically connected with the input-output short-circuit protector 3 respectively;

the output loop of the device can cut off any one phase of three-phase power through the open-phase control button 407 of the panel corresponding to the open-phase A, the open-phase B and the open-phase C through an internal automatic control circuit, and outputs open-phase power supply to the distribution box, so as to detect whether the distribution box to be detected can identify the open-phase power supply state and perform protection action.

A phase sequence switching knob 408 is arranged on the upper side of the output voltage display screen 406 on the operation panel 4, and the phase sequence switching knob 408 is electrically connected with the phase sequence switching module;

the output loop of the device can change the output phase sequence through the panel phase sequence switching knob 408 through an internal automatic control circuit, and is used for supplying power to the distribution box output phase sequence error, detecting whether the distribution box to be tested can identify the phase sequence error power supply state and performing protection action.

According to the device, the unnecessary volume is compressed according to actual conditions, the equipment volume is compressed to the standard 3U plug box with the depth of 19 inches and 300mm, the device can be placed on an operation desk or installed in a standard 19-inch cabinet, the design weight of the device is 16kg, a single person does not need to assist in moving, the whole working efficiency is improved, the testing operation function of the device is concentrated on the operation panel 4, the operation is simple and visual, the operation is convenient, the traditional terminal wiring is abandoned, a replaceable quick interface is adopted to be electrically connected with a to-be-tested distribution box, and the replacement after the interface is worn is convenient;

a single-phase input voltage display screen 404 is arranged on the upper side of the middle part of the operation panel 4, a grounding column 409 is arranged on one side of the operation panel 4, which is positioned on the leakage current test socket 403, and a five-port socket 411 is arranged in the center of the middle part of the operation panel 4;

the input and output of the equipment are all provided with short-circuit protection, the equipment buttons are controlled through a low-voltage 24V relay, the operation is safe and reliable, the electric taking use of soldering iron, an air heater, a notebook computer, illumination and the like during debugging is facilitated through a five-port socket 411, and a temporary material box is designed at the top of the case and used for accommodating small parts which are used in debugging and are easy to lose, such as cabinet door keys, connector dust covers, screw nuts, terminals and the like.

The two ends of the rear side of the casing 6 are provided with radiating holes for radiating heat for each heating device in the casing 6, a radiating fan 33 is arranged on the radiating hole at one end, cold air enters the casing from two sides of the casing, and after passing through the voltage regulator and the resistor, the hot air is discharged to the rear side through the radiating fan 33;

an input wire harness slot 412 is installed at the rear side of the casing 6 and below the input/output short-circuit protector 3, an output wire harness slot 410 is installed at the lower side of the middle part of the operation panel 4, and an output wire harness is bound through the output wire harness slot 410, and a wire harness input into the device is bound through the input wire harness slot 412, so that wire management is facilitated.

When the utility model is used, aiming at the distribution box to be debugged just assembled, the first power-on needs to be gradually increased from 0V to rated voltage, the AC380V of the commercial power input by the input short-circuit protection interface 31 is converted into continuous adjustable alternating current output through the transverse contact voltage regulator 1, the requirements of power supply and detection control actions of a secondary circuit of the distribution box in an empty load state are met, 20 mA-370 mA continuous adjustable current is generated through the adjustable leakage current generating circuit 2, the 30mA leakage current protection function and the 300mA leakage current protection function which are commonly used for electrical equipment are detected, the short-circuit problem which occurs in the input and output processes of the device is protected through the input and output short-circuit protector 3, the leakage current protection function, the output input voltage display function and the single-phase breaking function are respectively detected through the control of the device through the operation on the operation panel 4, therefore, each main function of the distribution box is rapidly and accurately detected, meanwhile, a power supply is assembled for the distribution box when the distribution box leaves a factory, the distribution box can be rapidly installed at a working position, time and labor are saved, the transverse contact voltage regulator 1 breaks through the three-layer stacking mode of the traditional contact voltage regulator, the whole volume is compressed, the adjustable leakage current generation circuit 2 uses a set of small-power disc-type sliding resistors to realize current adjustment in a wide range of 20 mA-370 mA, the weight of equipment is reduced, the device compresses the unnecessary volume according to actual conditions, compresses the volume of the equipment to a standard 3U plug box with the depth of 19 inches and 300mm, the device can be placed on an operation desk or installed in a standard 19 inch cabinet, the traditional terminal wiring is abandoned, a replaceable quick interface is adopted to be electrically connected with the distribution box to be detected, the replacement is convenient after the interface is worn, the device is designed to have the weight of 16kg, the device can be moved by a single person without assistance, so that the overall working efficiency is improved, and the device has the test operation function concentrated on the operation panel 4, and is simple, visual and convenient to operate;

the leakage current test socket 403 comprises a 30mA test socket and a 300mA test socket, and aims at the common 30mA and 300mA leakage protectors of the distribution box, wherein the 30mA test socket is used for providing 20-40 mA adjustable current and is used for verifying whether the protection action of the 30mA leakage protectors in the distribution box is normal or not; the 300mA test socket can provide 40-370 mA adjustable current for verify whether the protection action of 300mA earth leakage protector in the block terminal is normal, show the size of leakage current through leakage current display screen 402, insert this power supply into the block terminal input that awaits measuring, use the probe of taking banana plug, insert leakage current test socket 403 with the probe, the probe is put through with the N line of the arbitrary node in block terminal earth leakage protection equipment rear end that awaits measuring, can produce leakage current: inserting a probe plug into a 30mA test socket, enabling the probe to be in contact with N of an output end of the distribution box, observing a leakage current display screen 402, and then adjusting a leakage current adjusting knob 401 to enable leakage current to be adjusted within a range of 20 mA-40 mA, and observing whether the distribution box to be tested protects the leakage current within the range; the probe plug is inserted into the 300mA test socket, the probe is contacted with N of the output end of the distribution box, the leakage current display screen 402 is observed, the leakage current adjusting knob 401 is adjusted, leakage current can be adjusted within the range of 40 mA-365 mA, whether the distribution box to be tested protects the leakage current within the range or not is observed, so that the leakage protection test for the distribution box is rapidly completed, the output circuit of the device can change the output phase sequence through an internal automatic control circuit through the panel phase sequence switching knob 408, power supply for the output phase sequence error of the distribution box is used for detecting whether the distribution box to be tested can identify the phase sequence error power supply state and protecting the distribution box.

The operation flow of two test modes of adopting a universal test power supply of the distribution box and constructing a test board is compared:

comparison of the merits of the two test modes:

the present utility model is not limited to the above embodiments, but is not limited to the above embodiments, and any modifications, equivalents and variations made to the above embodiments according to the technical matter of the present utility model can be made by those skilled in the art without departing from the scope of the technical matter of the present utility model.

Claims (9)

1. The utility model provides a general test power supply of block terminal, its characterized in that, including casing (6), horizontal contact voltage regulator (1) are installed to inside one side of casing (6), leakage current generation circuit (2) are installed to inside opposite side of casing (6), operating panel (4) are installed to the front side of casing (6), rear side mid-mounting of casing (6) has input output short-circuit protector (3), mid-mounting of casing (6) has phase sequence to detect switching circuit (5), input output short-circuit protector (3) include input short-circuit protection interface (31) and output short-circuit protection interface (32), introduce external power supply through input short-circuit protection interface (31), output through output short-circuit protection interface (32) with the electric current output that modulates, equal electric connection between each electrical apparatus.

2. The universal test power supply for the distribution box according to claim 1, wherein a leakage current adjusting knob (401) is installed on one side, close to the adjustable leakage current generating circuit (2), of the operation panel (4), and an output voltage adjusting knob (405) is installed on one side, close to the transverse contact voltage regulator (1), of the operation panel (4).

3. The universal test power supply for the distribution box according to claim 2, wherein the voltage regulating coil and the insulating base are arranged in the transverse contact voltage regulator (1), the voltage regulating coil is fixed through the insulating base, a plurality of support columns are arranged between the insulating bases around the voltage regulating coil and are fixed, the insulating base is connected with the bottom surface, the side surface and the rear wall of the machine box through bolts, the middle of the voltage regulating coil is penetrated through a rotating shaft, the rotating shaft extends out of the front panel and is connected with the output voltage regulating knob (405), an insulating slip ring is designed at the joint of the rotating shaft and the front panel, meanwhile, the transverse contact voltage regulator (1) is provided with an air duct at the position of the voltage regulating coil, and a fan is arranged in the air duct.

4. The universal test power supply for the distribution box according to claim 1, wherein a leakage current display screen (402) is installed on one side of the operation panel (4) located on the leakage current adjusting knob (401), a leakage current test socket (403) is installed on the lower side of the leakage current display screen (402) on the operation panel (4), and the leakage current test socket (403) comprises a 30mA test socket and a 300mA test socket.

5. The universal test power supply for the distribution box according to claim 1, wherein an output voltage display screen (406) is installed on one side, close to the output voltage adjusting knob (405), of the operation panel (4), phase-loss control buttons (407) are installed on the lower side, located on the output voltage display screen (406), of the operation panel (4), three phase-loss control buttons (407) are arranged, and the three phase-loss control buttons (407) are electrically connected with the input-output short-circuit protector (3) respectively.

6. The universal test power supply for the distribution box according to claim 1, wherein a phase sequence switching knob (408) is installed on the upper side of the output voltage display screen (406) on the operation panel (4), and the phase sequence switching knob (408) is electrically connected with the phase sequence switching module.

7. The universal test power supply for the distribution box according to claim 1, wherein a single-phase input voltage display screen (404) is installed on the upper side of the middle of the operation panel (4), a grounding column (409) is installed on one side, located on the leakage current test socket (403), of the operation panel (4), and a five-port socket (411) is installed in the center of the middle of the operation panel (4).

8. The universal test power supply for the distribution box according to claim 1, wherein the two ends of the rear side of the casing (6) are provided with heat dissipation holes for dissipating heat of each heating device in the casing (6), and the heat dissipation holes at one end are provided with heat dissipation fans (33).

9. The universal test power supply for the distribution box according to claim 1, wherein an input wire bundle groove (412) is arranged on the rear side of the machine shell (6) and below the input/output short-circuit protector (3), and an output wire bundle groove (410) is arranged on the lower side of the middle of the operation panel (4).