Low-voltage circuit breaker short-circuit test system for simulating marine environment

Abstract

The utility model discloses a low-voltage circuit breaker short-circuit test system for simulating an offshore environment, which comprises a test bench, an offshore air environment simulation system and a low-voltage alternating-current and direct-current short-circuit test module, and is characterized in that the test bench is provided with a short-circuit test groove which is used for installing a low-voltage circuit breaker to be tested; the offshore air environment simulation system comprises a temperature and humidity simulation unit, a salt mist simulation unit, an oil mist simulation unit and a cold and hot device. The low-voltage AC / DC short-circuit test module is connected with the low-voltage circuit breaker through a cable and a wiring busbar, and provides short-circuit test current for the low-voltage circuit breaker. According to the low-voltage circuit breaker short-circuit test system capable of simulating the marine environment, short-circuit tests of the low-voltage circuit breaker in marine high-temperature, low-temperature, humid, salt mist, oil mist, vibration, swing and inclination environments are simulated in a land test room, and the accuracy of test results is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage circuit breaker test technical field, and specifically relates to a low voltage circuit breaker short circuit test system of simulation offshore environment. BACKGROUND

[0002] With the development of China's marine economy, various low voltage circuit breakers are widely used in ships, islands, offshore oil drilling platforms, offshore scientific research platforms, offshore wind farms and other occasions, such as marine low voltage circuit breakers. Marine low voltage circuit breakers are usually detected according to the standard JB / T 5796-2021 "Marine Low Voltage Air Circuit Breaker".

[0003] Low voltage circuit breaker is a key element to ensure the safe and reliable operation of circuit, and its short circuit protection characteristic is the core function, so the short circuit test is the main detection item of low voltage circuit breaker. Most of the contacts of low voltage circuit breaker adopt air type structure, and the arc extinguishing medium is the air at the use site. Therefore, the short circuit protection capability and the short circuit test result are closely related to the air state at the use site. For the short circuit protection capability, the environmental factors affecting are the surrounding air temperature, humidity (affected by the humid air on the sea), salt mist, oil mist, vibration, swing and inclination.

[0004] Directly carrying out low voltage circuit breaker short circuit test on the sea has the disadvantages of lacking test power supply, long cycle and high cost. Therefore, it is a better choice to carry out the test in a laboratory on land. At present, when carrying out short circuit test on low voltage circuit breaker used in marine environment, multiple environmental factors such as surrounding air temperature, humidity, salt mist, oil mist, vibration, swing and inclination cannot be simulated at the same time, resulting in inaccurate test result.

[0005] Therefore, the above problems are further improved. UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to provide a low voltage circuit breaker short circuit test system simulating offshore environment, which realizes short circuit test of low voltage circuit breaker in simulated offshore high temperature, low temperature, humidity, salt mist, oil mist, vibration, swing and inclination environment in a laboratory on land, and improves the accuracy of test result.

[0007] In order to achieve the above purpose, the utility model provides a low voltage circuit breaker short circuit test system simulating offshore environment, which comprises a (vibration or inclination swing) test table, a simulated offshore air environment system and a low voltage AC / DC short circuit test module, wherein:

[0008] The test table is provided with a short circuit test tank for installing low voltage circuit breaker to be tested, and the test tank is provided with a temperature and humidity sensor, a salt mist concentration sensor and an oil mist concentration sensor (combined with a controller to form a sensing and control system);

[0009] The simulation marine air environment system comprises a temperature and humidity simulation unit, a salt spray simulation unit, an oil mist simulation unit and a cold and hot device, wherein:

[0010] The temperature and humidity simulation unit comprises a distilled water tank, a first electromagnetic valve, a first liquid pump and a first atomizer, the temperature and humidity sensor is connected with the cold and hot device and the first electromagnetic valve respectively, one end of the first electromagnetic valve is connected with the distilled water tank and the other end of the first electromagnetic valve is connected with the first atomizer through the first liquid pump;

[0011] The salt spray simulation unit comprises a saturated sodium chloride solution tank, a second electromagnetic valve, a second liquid pump and a second atomizer, the salt spray concentration sensor is connected with the second electromagnetic valve, one end of the second electromagnetic valve is connected with the saturated sodium chloride solution tank and the other end of the second electromagnetic valve is connected with the second atomizer through the second liquid pump;

[0012] The oil mist simulation unit comprises an oil tank, a third electromagnetic valve, a third liquid pump and a third atomizer, the oil mist concentration sensor is connected with the third electromagnetic valve, one end of the third electromagnetic valve is connected with the oil tank and the other end of the third electromagnetic valve is connected with the third atomizer through the third liquid pump;

[0013] The low-voltage AC / DC short-circuit test module is connected with the low-voltage circuit breaker (test product) through a cable and a wiring bus, and provides a short-circuit test current for the low-voltage circuit breaker.

[0014] As a further preferred technical solution of the above technical solution, for the simulation marine air environment system, wherein:

[0015] Further comprising an oil separator, the oil separator is connected with the oil tank;

[0016] Further comprising a first condenser, an evaporator and a second condenser, the first condenser is connected with one end of the evaporator through a first filter, the other end of the evaporator is connected with the distilled water tank through a second filter and a second condenser.

[0017] As a further preferred technical solution of the above technical solution, the short-circuit test tank is fixedly installed on the test table through a base.

[0018] As a further preferred technical solution of the above technical solution, the low-voltage AC / DC short-circuit test module further comprises a cable hanging tool, the cable hanging tool comprises a support module and a cable installation module, the cable installation module is installed on the support module and the cable installation module is used for installing the cable.

[0019] As a further preferred technical solution of the above technical solution, the support module comprises an insulating top base, a straight arm, an upper rocker arm, a lower rocker arm and a shock absorber, wherein:

[0020] The insulating top base is installed at a preset position (for example, on a laboratory floor) by a first fixing screw, the outer ring of a first ball bearing is fixedly installed at the lower part of the straight arm, and the lower end of the lower rocker arm is installed at the inner ring of the first ball bearing; the outer ring of a second ball bearing is fixedly installed at the insulating top base, and the upper end of the upper rocker arm is installed at the inner ring of the second ball bearing; the outer ring of a third ball bearing is fixedly installed at the insulating top base, and the upper end of the straight arm is installed at the inner ring of the third ball bearing; and the shock absorber is installed between the lower end of the upper rocker arm and the upper end of the lower rocker arm.

[0021] The cable installation module comprises a hoop, a second fixing screw, a lower insulating plate, a sliding groove, a sliding buckle, a first spring (a small ceramic spring), a second spring (a large ceramic spring) and an upper insulating plate, wherein:

[0022] The cable is installed on the lower insulating plate through the hoop and the second fixing screw, the upper insulating plate is located above the lower insulating plate and is fixedly installed at the lower end of the straight arm, the two sides and the middle part of the lower insulating plate and the upper insulating plate are respectively provided with the sliding groove and the sliding buckle, the first spring is installed in the sliding groove, and the second spring is installed between the lower insulating plate and the upper insulating plate.

[0023] The utility model discloses the beneficial effect lies in:

[0024] 1. It can simulate the different sea environment (such as island) of temperature, humidity, salt fog, oil fog state different from land, and further simulate the sea environment (such as ship, offshore platform) existing vibration, swing, inclination state by matching short-circuit test tank and vibration or inclination swing test bench.

[0025] 2. The use of cable hanging tool greatly reduces the stress of the cable during vibration and swing, and prevents the cable from being damaged or even broken. The problem that the fixedly installed copper bar cannot vibrate and tilt swing is solved, so that the short-circuit test of low-voltage circuit breaker can be carried out under the condition of vibration and tilt swing.

[0026] 3. The low-voltage circuit breaker short-circuit test system for simulating sea environment is used to replace the direct low-voltage circuit breaker short-circuit test on the sea, which shortens the product development cycle of circuit breaker and reduces the development cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 It is the overall schematic diagram of the utility model.

[0028] Fig. 2It is the structure schematic view of the simulation sea air environment system of the utility model.

[0029] Fig. 3 It is the structure schematic view of the cable hanging tool of the utility model.

[0030] The signs include: 1, temperature and humidity sensor; 2, salt fog concentration sensor; 3, oil mist concentration sensor; 4, saturated sodium chloride solution tank; 5, oil tank; 6, distilled water tank; 7, second electromagnetic valve; 8, third electromagnetic valve; 9, first electromagnetic valve; 10-16, electromagnetic valve; 17, first condenser; 18, evaporator; 19, second condenser; 20, second atomizer; 21, third atomizer; 22, first atomizer; 23, third liquid pump; 24, second liquid pump; 25, first liquid pump; 26-27, air pump; 28, oil separator; 29, check valve; 30, cold and hot equipment; 31, short-circuit test tank; 32, first filter; 33, second filter; 101, clamp; 102, second fixing screw; 103, lower insulating plate; 104, sliding groove; 105, sliding buckle; 106, first spring; 107, second spring; 108, upper insulating plate; 109-1, first ball bearing; 109-2, second ball bearing; 109-3, third ball bearing; 110, lower rocker arm; 111, upper rocker arm; 112, shock absorber; 113, straight arm; 114, insulating top seat; 115, first fixing screw. DETAILED DESCRIPTION

[0031] The following description is used to disclose the utility model so that those skilled in the art can realize the utility model. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought by those skilled in the art. The basic principles of the utility model defined in the following description can be applied to other implementation schemes, modification schemes, improvement schemes, equivalent schemes and other technical schemes without departing from the spirit and scope of the utility model.

[0032] In the preferred embodiments of the utility model, those skilled in the art should note that the low-voltage circuit breaker and the like involved in the utility model can be regarded as prior art.

[0033] Preferred embodiments.

[0034] As Figs. 1-3 shown, the utility model discloses a kind of low-voltage circuit breaker short-circuit test system of simulation sea environment, including (vibration or inclination swing) test bench, simulation sea air environment system and low-voltage AC / DC short-circuit test module, wherein:

[0035] The test bench is installed with a short circuit test tank 31 and the short circuit test tank is used to install the low voltage circuit breaker to be tested, the test tank is installed with the temperature and humidity sensor 1, the salt mist concentration sensor 2 and the oil mist concentration sensor 3 (combined with the controller to form a sensing and control system);

[0036] The simulated marine air environment system comprises a temperature and humidity simulation unit, a salt mist simulation unit, an oil mist simulation unit and a cold and hot device, wherein:

[0037] The temperature and humidity simulation unit comprises a distilled water tank 6, a first electromagnetic valve 9, a first liquid pump 25 and a first atomizer 22, the temperature and humidity sensor 1 is connected with the cold and hot device 30 and the first electromagnetic valve 9 respectively, one end of the first electromagnetic valve 9 is connected with the distilled water tank 6 and the other end of the first electromagnetic valve 9 is connected with the first atomizer 22 through the first liquid pump 25;

[0038] The salt mist simulation unit comprises a saturated sodium chloride solution tank 4, a second electromagnetic valve 7, a second liquid pump 23 and a second atomizer 20, the salt mist concentration sensor 2 is connected with the second electromagnetic valve 7, one end of the second electromagnetic valve 7 is connected with the saturated sodium chloride solution tank 4 and the other end of the second electromagnetic valve 7 is connected with the second atomizer 22 through the second liquid pump 23;

[0039] The oil mist simulation unit comprises an oil tank 5, a third electromagnetic valve 8, a third liquid pump 24 and a third atomizer 21, the oil mist concentration sensor 3 is connected with the third electromagnetic valve 8, one end of the third electromagnetic valve 8 is connected with the oil tank 5 and the other end of the third electromagnetic valve 8 is connected with the third atomizer 21 through the third liquid pump 24;

[0040] The low voltage AC / DC short circuit test module is connected with the low voltage circuit breaker (test product) through a cable and a wiring bus, and provides a short circuit test current for the low voltage circuit breaker.

[0041] For the simulated marine air environment system, wherein:

[0042] Further comprising an oil separator 28, the oil separator 28 is connected with the oil tank 5;

[0043] Further comprising a first condenser 17, an evaporator 18 and a second condenser 19, the first condenser 17 is connected with one end of the evaporator 18 through a first filter 32, the other end of the evaporator 18 is connected with the distilled water tank 6 through a second filter 33 and a second condenser 19.

[0044] The temperature and humidity sensor 1 senses the temperature and humidity in the tank (short-circuit test tank) and feeds back to the cold and hot device 30 and the electromagnetic valve 9, controls the refrigeration and heating of the cold and hot device and the opening and closing of the electromagnetic valve to adjust the temperature and humidity in the tank; the salt mist concentration sensor 2 senses the salt mist concentration in the tank, controls the opening and closing of the electromagnetic valve 7 to adjust the salt mist concentration in the tank; the oil mist concentration sensor 3 detects the oil mist concentration in the tank, controls the opening and closing of the electromagnetic valve 8 to adjust the oil mist concentration in the tank; the saturated sodium chloride solution tank 4 provides sodium chloride required for simulating sea salt mist environment; the oil tank 5 provides oil required for oil mist environment; the distilled water tank 6 provides water vapor required for marine humidity environment; the electromagnetic valves 10-16 control the opening and closing and switching of the pipeline; the first condenser 17 is used to condense the extracted gas to precipitate sodium chloride; the evaporator 18 is used to evaporate the liquid generated after condensation to separate water vapor; the second condenser 19 is used to re-condense the water vapor into distilled water and discharge it into the distilled water tank 6 to realize the recycling of distilled water; the functions of the atomizers 20-22 are to atomize the extracted saturated sodium chloride solution, oil and distilled water into small droplets; the liquid pumps 23-25 are used to suck the liquid from the liquid tank and pump it into the atomizer; the function of the oil separator 28 is to separate the oil in the oil mist and discharge it back into the oil tank to realize recycling; the check valve 29 prevents the mixed gas in the tank from flowing back into the liquid tank; the cold and hot device 30 is used to adjust the premixed gas to the required temperature; the air pumps 26-27 generate air pressure difference to realize the flow of gas in the pipeline; the filters 32-33 are detachable and are used to filter out the precipitated sodium chloride in the solution to realize the recycling of sodium chloride.

[0045] The short-circuit test tank 31 takes appropriate measures such as painting anti-rust paint inside to prevent the tank wall from being corroded by long-term operation in salt mist conditions. The lower part has a base, and the short-circuit test tank is fixedly installed on the test bench through the base to prevent relative movement between the two during testing, vibration and tilting swing cannot be performed at the same time, different test benches need to be used. Therefore, when changing the test bench, the test tank needs to be disassembled together with the base and then reinstalled on the required test bench; the vibration or tilting swing test bench is used to simulate the actual vibration or tilting swing environment.

[0046] In the case of no vibration and tilting swing, the short-circuit current can be transmitted from the low-voltage AC and DC short-circuit test module to the wiring busbar of the test tank through the copper bars fixed on the wall and hung on the test room floor. This installation method is fixed installation, and the copper bars cannot be displaced during testing, and cannot be used in vibration and tilting swing conditions. Therefore, an important problem to be solved in the low-voltage circuit breaker short-circuit test under vibration and tilting swing conditions is the transmission of current.

[0047] Therefore, as Fig. 3As shown, the low-voltage AC-DC short-circuit test module further comprises a cable hanging tool, which comprises a support module and a cable installation module, and the cable installation module is installed on the support module and is used to install the cable.

[0048] Further, the support module comprises an insulating top base 114, a straight arm 113, an upper rocker arm 111, a lower rocker arm 110 and a shock absorber 112, wherein:

[0049] The insulating top base 114 is installed at a preset position (such as a laboratory floor) by a first fixing screw 115, the outer ring of a first ball bearing 109-1 is fixedly installed at the lower part of the straight arm 113, and the lower end of the lower rocker arm 110 is installed at the inner ring of the first ball bearing 109-1; the outer ring of a second ball bearing 109-2 is fixedly installed at the insulating top base 114, and the upper end of the upper rocker arm 111 is installed at the inner ring of the second ball bearing 109-2; the outer ring of a third ball bearing 109-3 is fixedly installed at the insulating top base 114, and the upper end of the straight arm 113 is installed at the inner ring of the third ball bearing 109-3; the shock absorber 112 is installed between the lower end of the upper rocker arm 111 and the upper end of the lower rocker arm 110.

[0050] The cable installation module comprises a hoop 101, a second fixing screw 102, a lower insulating plate 103, a sliding groove 104, a sliding buckle 105, a first spring 106 (small ceramic spring), a second spring 107 (large ceramic spring) and an upper insulating plate 108, wherein:

[0051] The cable is installed on the lower insulating plate 103 by the hoop 101 and the second fixing screw 102, the upper insulating plate 108 is located above the lower insulating plate 103 and is fixedly installed at the lower end of the straight arm 113, the two sides and the middle part of the lower insulating plate 103 and the upper insulating plate 108 are respectively provided with the sliding groove 104 and the sliding buckle 105, the first spring 106 is installed on the sliding groove 104, and the second spring 107 is installed between the lower insulating plate 103 and the upper insulating plate 108.

[0052] Firstly, the tool is fixed and installed on the laboratory floor by the first fixing screw 115; the cable is fixed on the lower insulating plate 103 by the clamp 101 and the second fixing screw 102; the sliding groove 104 and the sliding buckle 105 are used to keep the position of the upper insulating plate 108 and the lower insulating plate 103 aligned; the lower end of the straight arm 113 is fixedly connected with the upper insulating plate 108; the small ceramic spring 106 is used for damping and is installed on the upper and lower positions of the sliding groove to prevent the direct collision between the sliding buckle and the sliding groove at both ends in the vibration process; the large ceramic spring 107 is fixedly installed between the upper insulating plate and the lower insulating plate and is used for damping; the outer ring of the ball bearing 109-1 is fixedly installed on the straight arm 113, and the shaft at the end of the lower swing arm 110 is installed on the inner ring of the ball bearing 109-1; the outer ring of the ball bearing 109-2 is fixedly installed on the insulating top seat 114, and the shaft at the end of the upper swing arm 111 is installed on the inner ring of the ball bearing 109-2; the outer ring of the ball bearing 109-3 is fixedly installed on the insulating top seat 114, and the shaft at the upper end of the straight arm 113 is installed on the inner ring of the ball bearing 109-3; the ball bearing allows the relative rotation between each part connected by the ball bearing; the shock absorber 112 is provided with the lower swing arm 110 and the upper swing arm 111 at both sides and is used for limiting the swing amplitude and speed of the straight arm, thereby preventing the cable from being swung too much to cause danger and damage during the swing test. The clamp, the screw, the sliding groove and the sliding buckle of the tool are all made of non-metal insulating materials to prevent electromagnetic induction interference caused by large short-circuit current. The height of the whole tool is close to the height from the laboratory floor to the busbar. The test uses a relatively soft cable and has a reserved length.

[0053] The use of the cable hanging tool greatly reduces the stress on the cable during the vibration and swing process, prevents the cable from being damaged or even pulled off, and thus enables the short-circuit test of the low-voltage circuit breaker to be carried out under the vibration and swing condition.

[0054] For the utility model:

[0055] The inclined and swinging test bed is used for simulating the inclination and swinging of a ship or offshore platform, and provides a marine vibration, inclination and swinging environment for a tested low-voltage circuit breaker. The short-circuit test tank is installed on the vibration or inclined and swinging test bed, and the temperature, humidity, salt mist and oil mist inside the tank can be controlled and adjusted by the simulated marine air environment system. The low-voltage AC / DC short-circuit test module, in which the AC module part, can not only generate a short-circuit test current by an impact test transformer through power supply from a power grid, but also generate a special frequency test current of non-50 Hz through frequency conversion excitation of an impact generator. The two-way AC test circuit can be switched to select the optimal method, which is not only economic and efficient, but also can be used for the short-circuit test of a 20 Hz low-frequency circuit breaker for offshore wind power, and has a wide range of applications. The low-voltage AC / DC short-circuit test module is connected to the test product through a cable and a busbar, and provides a short-circuit test current for the tested low-voltage circuit breaker. The test data is collected by a data acquisition system. The sensing and control system is used for sensing the temperature, humidity and other states in the short-circuit test tank, and can control the test tank air inlet and outlet, pressure relief valve opening and closing, tested circuit breaker closing and opening, test tank door opening and closing, and the like. The vibration test bed or inclined and swinging test bed is used for simulating the vibration environment in a cabin of a ship or offshore platform or the inclination and swinging of a ship or offshore platform, and provides a marine vibration, inclination and swinging environment for a tested low-voltage circuit breaker.

[0056] The test step principle of the low-voltage circuit breaker short-circuit test system for simulating a marine environment provided by the embodiment is as follows:

[0057] (1) The vibration test and inclined and swinging test need to use different test beds, so firstly determine whether the main marine environmental factor affecting the short-circuit protection performance of the tested circuit breaker is vibration or inclined and swinging. If it is vibration, the short-circuit test tank is installed on the vibration test bed. If it is inclined and swinging, the test tank is installed on the inclined and swinging test bed. If it is used for a circuit breaker in a temperature, humidity, salt mist and oil mist environment without vibration, inclination and swinging on an island or the like, one test bed can be selected for installation.

[0058] (2) Open the test tank, install the DC circuit breaker at the DC test station, and install the AC circuit breaker at the AC test station.

[0059] (3) The low-voltage AC / DC short-circuit test module is connected to the busbar of the test tank through a cable, and the inside of the busbar is connected to the tested low-voltage circuit breaker using a suitable conductor.

[0060] (4) After closing the test tank, the salt mist and oil mist pre-mixed gas with the required temperature and humidity (if required) is pumped into the short-circuit test tank through the opening in the side wall of the test tank to simulate the temperature, humidity, salt mist and oil mist environment on the sea. The temperature, humidity and other states in the short-circuit test tank are monitored by sensors. When the set values are reached and maintained for a period of time, the gas inlet and outlet are closed, and the gas supply pipe is removed (if vibration, inclination and swinging are not performed, the gas supply pipe does not need to be removed).

[0061] (5) After setting the test parameters of vibration or tilting swing, start the vibration test bench or the tilting swing test bench;

[0062] (6) Select the test circuit according to the type of circuit breaker, select the DC test circuit for DC circuit breaker. The AC circuit breaker with rated frequency of 50Hz is tested by using the power grid power source. The AC circuit breaker with rated frequency not equal to 50Hz is tested by using the impact generator to obtain the short-circuit test current. The short-circuit current and voltage are adjusted to the required values by adjusting the adjustable high-voltage impedance in the front stage and the adjustable impedance in the rear stage, then the switch is closed to make the short-circuit test current flow through the tested circuit breaker, and the test data are collected by using the sensor.

[0063] It is worth mentioning that the technical features of the low-voltage circuit breaker involved in the utility model patent application should be regarded as the prior art, the specific structure, working principle and possible control mode and spatial arrangement mode of these technical features can be selected by using the conventional selection in the field, and should not be regarded as the invention point of the utility model patent, and the utility model patent will not be further expanded and described in detail.

[0064] For those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A low voltage circuit breaker short circuit test system simulating a marine environment, characterized in that, The test bench, the simulated sea air environment system and the low-voltage AC / DC short-circuit test module are provided, wherein: The test bench is provided with a short-circuit test tank for installing the low-voltage circuit breaker to be tested, and the short-circuit test tank is provided with a temperature and humidity sensor, a salt mist concentration sensor and an oil mist concentration sensor; The simulated sea air environment system comprises a temperature and humidity simulation unit, a salt mist simulation unit, an oil mist simulation unit and a cold and hot device, wherein: The temperature and humidity simulation unit comprises a distilled water tank, a first electromagnetic valve, a first liquid pump and a first atomizer, the temperature and humidity sensor is connected with the cold and hot device and the first electromagnetic valve respectively, one end of the first electromagnetic valve is connected with the distilled water tank and the other end of the first electromagnetic valve is connected with the first atomizer through the first liquid pump; The salt mist simulation unit comprises a saturated sodium chloride solution tank, a second electromagnetic valve, a second liquid pump and a second atomizer, the salt mist concentration sensor is connected with the second electromagnetic valve, one end of the second electromagnetic valve is connected with the saturated sodium chloride solution tank and the other end of the second electromagnetic valve is connected with the second atomizer through the second liquid pump; The oil mist simulation unit comprises an oil tank, a third electromagnetic valve, a third liquid pump and a third atomizer, the oil mist concentration sensor is connected with the third electromagnetic valve, one end of the third electromagnetic valve is connected with the oil tank and the other end of the third electromagnetic valve is connected with the third atomizer through the third liquid pump; The low-voltage AC / DC short-circuit test module is connected with the low-voltage circuit breaker through a cable and a busbar, and provides a short-circuit test current for the low-voltage circuit breaker.

2. The low voltage circuit breaker short circuit test system simulating marine environment according to claim 1, characterized in that, For the simulated sea air environment system, wherein: Further comprising an oil separator connected with the oil tank; Further comprising a first condenser, an evaporator and a second condenser, the first condenser is connected with one end of the evaporator through a first filter, the other end of the evaporator is connected with the distilled water tank through a second filter and a second condenser.

3. The low voltage circuit breaker short circuit test system simulating marine environment according to claim 1, characterized in that, The short-circuit test tank is fixedly installed on the test bench through a base.

4. The low voltage circuit breaker short circuit test system simulating marine environment according to claim 1, characterized in that, The low-voltage AC / DC short-circuit test module further comprises a cable hanging tool, the cable hanging tool comprises a support module and a cable installation module, the cable installation module is installed on the support module and is used for installing the cable.

5. The low voltage circuit breaker short circuit test system simulating marine environment according to claim 4, characterized in that, The support module comprises an insulating top base, a straight arm, an upper swing arm, a lower swing arm and a shock absorber, wherein: The insulating top base is installed at a preset position through a first fixing screw, an outer ring of a first ball bearing is fixedly installed at a lower part of the straight arm, a lower end of the lower swing arm is installed at an inner ring of the first ball bearing; an outer ring of a second ball bearing is fixedly installed at the insulating top base and an upper end of the upper swing arm is installed at an inner ring of the second ball bearing; an outer ring of a third ball bearing is fixedly installed at the insulating top base and an upper end of the straight arm is installed at an inner ring of the third ball bearing; the shock absorber is installed between the lower end of the upper swing arm and the upper end of the lower swing arm; The cable installation module comprises a hoop, a second fixing screw, a lower insulating plate, a sliding groove, a sliding buckle, a first spring, a second spring and an upper insulating plate, wherein: The cable is installed on the lower insulating plate through the clamp and the second fixing screw, the upper insulating plate is located above the lower insulating plate and is fixedly installed on the lower end of the straight arm, the two sides and the middle part of the lower insulating plate and the upper insulating plate are respectively provided with the sliding groove and the sliding buckle, the first spring is installed on the sliding groove and the second spring is installed between the lower insulating plate and the upper insulating plate.

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