Medium-voltage resistance-adjustable water resistor

Abstract

The invention relates to a medium-voltage resistance-adjustable water resistor which comprises a resistor box, an electrode plate is installed on the resistor box, the resistor box is filled with electrolyte, a resistor adjusting pipeline and a cooling pipeline are connected to the resistor box, and the resistor adjusting pipeline is connected with a resistor adjusting device to achieve resistor adjustment. The cooling pipeline is connected with a cooling device to cool the resistance box. According to the invention, automatic resistance adjustment can be realized, an efficient cooling function is realized, and the high-reliability requirements of medium-voltage cable load experiments and relay protection tests are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics and electrical engineering, and particularly relates to a medium-voltage adjustable resistance water resistance. BACKGROUND

[0002] With the rapid development of intelligentization of power systems and industrial automation, medium-voltage cables and high-voltage electrical equipment are increasingly widely used in distribution networks, industrial production and energy transmission. In medium-voltage cable load experiments and relay protection tests, different load conditions need to be simulated to verify the voltage resistance performance of the cable and the action reliability of the relay protection device. However, the traditional load simulation devices (such as fixed resistors, frequency-sensitive reactors, etc.) have problems such as unadjustable resistance, large size, low heat dissipation efficiency, etc., and cannot meet the needs of dynamic load experiments and complex working conditions.

[0003] As a resistance adjusting device based on electrolyte, the water resistance has certain application in motor starting and load simulation due to its advantages of easy resistance adjustment and low cost. However, the existing water resistance devices generally have the following defects: first, the resistance adjustment depends on manual operation, lacking automation and accuracy; second, the electrolyte is easily contaminated or deteriorated, resulting in unstable resistance; third, heat accumulates seriously during work, lacking efficient cooling mechanism, affecting the service life of the equipment and the experimental accuracy. In view of the above problems, it is urgent to develop a water resistance system capable of realizing automatic resistance adjustment and having efficient cooling function to meet the high reliability requirements of medium-voltage cable load experiments and relay protection tests. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a medium-voltage adjustable resistance water resistance, which realizes controllable simulation of load by dynamically adjusting the resistance of electrolyte, and integrates automatic adjustment and efficient cooling function to ensure the stability and reliability of the equipment in medium-voltage cable load experiments and relay protection tests.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] The embodiments of the present application provide a medium-voltage adjustable resistance water resistance, which comprises a resistance box, an electrode plate is installed on the resistance box, an electrolyte is filled in the resistance box, a resistance adjusting pipeline and a cooling pipeline are connected to the resistance box, the resistance adjusting pipeline is connected to a resistance adjusting device to realize resistance adjustment, and the cooling pipeline is connected to a cooling device to realize cooling of the resistance box.

[0007] The resistance adjusting device comprises a resistance powder storage tank, the resistance powder storage tank is connected to a regulating valve, and the resistance powder in the resistance powder storage tank is transported to the resistance adjusting pipeline through the regulating valve and then input into the resistance box.

[0008] The resistance adjusting device further comprises an electric conductivity meter, an electric three-way valve and a filter membrane, the electric conductivity meter is arranged on the liquid outlet pipeline of the resistance adjusting pipeline to measure the electric conductivity of the electrolyte output from the resistance box, the first port of the electric three-way valve is connected with the liquid outlet pipeline of the resistance adjusting pipeline, the second port of the electric three-way valve is connected with the liquid inlet pipeline of the resistance adjusting pipeline, the third port of the electric three-way valve is connected with the input end of the filter membrane, and the output end of the filter membrane is connected with the liquid inlet pipeline of the resistance adjusting pipeline.

[0009] The resistance adjusting device further comprises a peristaltic pump arranged between the liquid outlet pipeline of the resistance adjusting pipeline and the first port of the electric three-way valve.

[0010] A thermometer is arranged on the liquid outlet pipeline of the resistance adjusting pipeline.

[0011] The filter membrane adopts a polypropylene filter membrane with a pore size of 5 mu m, and the filter membrane and the peristaltic pump form a circulating filtration loop.

[0012] The cooling device comprises a heat-conducting cooling radiator pipe arranged outside the resistance box, and the heat-conducting cooling radiator pipe is connected with a cooling pipeline.

[0013] The cooling device further comprises a variable frequency water pump and a flow meter, and the variable frequency water pump and the flow meter are arranged on the cooling pipeline to realize circulating cooling.

[0014] A thermometer is arranged on the cooling pipeline.

[0015] Aluminum alloy heat dissipation fins are additionally arranged outside the heat-conducting cooling radiator pipe.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] 1. Load simulation accuracy is improved: through resistance precise adjustment, the simulation requirements of different working conditions in the medium voltage cable load experiment are met, and the reliability of experimental data is improved.

[0018] 2. Relay protection test optimization: dynamic resistance adjustment and stable operation characteristics ensure the action accuracy of the relay protection device under extreme conditions such as overload and short circuit.

[0019] 3. Equipment life is prolonged: the synergistic effect of automatic filtration and cooling system reduces electrolyte deterioration and thermal stress damage, and significantly improves the service life of the water resistance. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 is a schematic diagram of a water resistance structure of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described below in combination with the drawings in the embodiments of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0023] The term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or apparatus including the element.

[0024] The terms "first", "second" and the like are only used to distinguish one entity or operation from another entity or operation, and cannot be understood as indicating or implying relative importance, and cannot be understood as requiring or implying any such actual relationship or order between the entities or operations.

[0025] As shown in Figure 1 The embodiments of the present application provide a medium-voltage adjustable resistance water resistance, which comprises a resistance box, an electrode plate 1 is installed on the resistance box, an electrolyte is filled in the resistance box, a resistance adjustment pipeline and a cooling pipeline are connected to the resistance box, the resistance adjustment pipeline is connected to a resistance adjustment device to realize resistance adjustment, and the cooling pipeline is connected to a cooling device to realize resistance box cooling. A circulating passage - an electrolyte circulating passage, a circulating passage a cooling liquid circulating passage.

[0026] The resistance adjustment device comprises a resistance powder storage tank 7, the resistance powder storage tank 7 is connected to an adjusting valve 8, and the resistance powder in the resistance powder storage tank 7 is transported to the resistance adjustment pipeline through the adjusting valve 8 and then input into the resistance box.

[0027] The resistance adjusting device further comprises an electric conductivity meter 3, an electric three-way valve 5 and a filter membrane 6, the electric conductivity meter 3 is arranged on the liquid outlet pipeline of the resistance adjusting pipeline to measure the electric conductivity of the electrolyte output from the resistance box, the first port of the electric three-way valve 5 is connected to the liquid outlet pipeline of the resistance adjusting pipeline, the second port of the electric three-way valve 5 is connected to the liquid inlet pipeline of the resistance adjusting pipeline, the third port of the electric three-way valve 5 is connected to the input end of the filter membrane 6, and the output end of the filter membrane 6 is connected to the liquid inlet pipeline of the resistance adjusting pipeline.

[0028] The resistance adjusting device further comprises a peristaltic pump 4 arranged between the liquid outlet pipeline of the resistance adjusting pipeline and the first port of the electric three-way valve.

[0029] A thermometer 2 is arranged on the liquid outlet pipeline of the resistance adjusting pipeline.

[0030] The filter membrane 6 is a polypropylene filter membrane with a pore size of 5 μm, and the filter membrane 6 and the peristaltic pump 4 form a circulating filtration loop.

[0031] The cooling device comprises a heat-conducting cooling radiator pipe 10 arranged outside the resistance box, and the heat-conducting cooling radiator pipe 10 is connected to a cooling pipeline.

[0032] The cooling device further comprises a variable frequency water pump 9 and a flow meter 11 arranged on the cooling pipeline to realize circulating cooling.

[0033] A thermometer 2 is also arranged on the cooling pipeline.

[0034] Aluminum alloy heat dissipation fins are additionally arranged outside the heat-conducting cooling radiator pipe 10.

[0035] In one specific embodiment, the thermometer, the electric conductivity meter, the peristaltic pump, the electric three-way valve and the adjusting valve are connected to an MCU controller, and the thermometer, the variable frequency water pump and the flow meter are connected to a PLC controller.

[0036] (I) Implementation of adjustable resistance value water resistance

[0037] 1. Preparation of electrolyte: dissolve ammonium chloride NH4Cl in deionized water in proportion, control the initial concentration at 0.5 mol / L, and the resistivity is about 2 Ω·cm. After preparation, pour the electrolyte into the resistance box of the water resistance container to ensure that the liquid level covers the electrode plate.

[0038] 3. Resistance value adjustment: input the target resistance value (such as 10 Ω) through the MCU controller, and the adjusting valve automatically adjusts the release device according to the resistance value calibration curve, while monitoring the actual resistance value and calibration.

[0039] (II) Implementation of automatic adjusting system

[0040] 1. Filtration module: install 5 μm aperture polypropylene filter membrane, cooperate with peristaltic pump to form a circulating filtration loop. Conductivity sensor collects electrolyte data every 5 seconds, if the conductivity exceeds ± 5% threshold, start filtering for 30 minutes.

[0041] 2. Resistance powder dosing: ammonium chloride NH4Cl in the storage tank, the dosing amount is controlled by the regulating valve, 1g is released each time, and the dosing frequency is automatically calculated according to the resistance deviation.

[0042] 3. Control logic: MCU controller runs PID algorithm, adjusts the position of the plate and the dosing amount based on the resistance feedback signal, and the response time is less than 1 second.

[0043] (Three) Implementation of cooling system

[0044] 1. Heat dissipation component: copper heat conduction cooling radiator pipe (diameter 10 mm) is selected and arranged outside the water resistance container resistance box, and aluminum alloy heat dissipation fins are additionally installed outside.

[0045] 2. Circulating cooling: configure 0.5kW frequency conversion water pump, cooling liquid flow range 0-10L / min. The cooling liquid is cooled by the radiator and then returns to the water resistance to form a closed circulation.

[0046] 3. Temperature control: install PT100 temperature sensor, connect to PLC controller. When the temperature exceeds 25℃, PLC increases the water pump speed to 80%, and starts the auxiliary fan; when the temperature is lower than 15℃, it is reduced to 20% to save energy.

[0047] The above only describes the embodiments of the present application and does not limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A medium-pressure adjustable resistance water resistor, characterized in that, The device includes a resistance box, on which electrode plates are mounted, and filled with electrolyte. A resistance adjustment pipe and a cooling pipe are connected to the resistance box. The resistance adjustment pipe is connected to a resistance adjustment device to adjust the resistance, and the cooling pipe is connected to a cooling device to cool the resistance box.

2. The medium-pressure adjustable resistance water resistor according to claim 1, characterized in that, The resistance regulating device includes a resistance powder storage tank, which is connected to a regulating valve. The resistance powder in the storage tank is transported to the resistance regulating pipeline through the regulating valve and then input into the resistance box.

3. The medium-pressure adjustable resistance water resistor according to claim 1, characterized in that, The resistance regulating device also includes a conductivity meter, an electric three-way valve, and a filter membrane. The conductivity meter is installed on the outlet pipe of the resistance regulating pipeline to measure the conductivity of the electrolyte output from the resistance box. The first port of the electric three-way valve is connected to the outlet pipe of the resistance regulating pipeline, the second port of the electric three-way valve is connected to the inlet pipe of the resistance regulating pipeline, the third port of the electric three-way valve is connected to the input end of the filter membrane, and the output end of the filter membrane is connected to the inlet pipe of the resistance regulating pipeline.

4. A medium-pressure adjustable resistance water resistor according to claim 3, characterized in that, The resistance regulating device also includes a peristaltic pump, which is disposed between the liquid outlet pipe of the resistance regulating pipeline and the first port of the electric three-way valve.

5. A medium-pressure adjustable resistance water resistor according to claim 3, characterized in that, A thermometer is installed on the outlet pipe of the resistance regulating pipe.

6. A medium-pressure adjustable resistance water resistor according to claim 4, characterized in that, The filter membrane is a polypropylene filter membrane with a pore size of 5μm, and the filter membrane is combined with a peristaltic pump to form a circulating filtration loop.

7. A medium-pressure adjustable resistance water resistor according to claim 1, characterized in that, The cooling device includes a thermally conductive cooling pipe disposed outside the resistor box, and the thermally conductive cooling pipe is connected to a cooling pipe.

8. A medium-pressure adjustable resistance water resistor according to claim 7, characterized in that, The cooling device also includes a variable frequency water pump and a flow meter, which are installed on the cooling pipe to achieve circulating cooling.

9. A medium-pressure adjustable resistance water resistor according to claim 7, characterized in that, The cooling pipe is also equipped with a thermometer.

10. A medium-pressure adjustable resistance water resistor according to claim 7, characterized in that, The heat-conducting cooling pipe is externally fitted with aluminum alloy heat dissipation fins.

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