Automatic heating device for preventing sulfur hexafluoride electrical equipment sealing gasket from cracking at low temperature

Abstract

The invention discloses an automatic heating device for preventing a sealing gasket of sulfur hexafluoride electrical equipment from cracking at low temperature, which relates to the technical field of insulating gas electrical equipment heating and comprises a temperature sensor, a heat tracing band, a heat insulation film, a heating controller and a temperature data collector. The flange joint of the sulfur hexafluoride electrical equipment is wrapped with a heat insulation film and a heat tracing band, a temperature sensor is arranged in an inner cavity of the automatic heating device, the heat tracing band is electrically connected with a heating controller, the temperature sensor is connected with a temperature controller, and the heating controller and the temperature controller are controlled by a heating temperature control automatic controller; the connecting flange part of the sulfur hexafluoride electrical equipment is wrapped by the automatic heating device, and the heating and temperature control process is automatically operated, so that the low-temperature cracking of a sealing gasket at the flange of the sulfur hexafluoride electrical equipment is avoided, the gas leakage phenomenon in the sulfur hexafluoride electrical equipment is avoided, the potential safety hazard of the equipment is eliminated, and the safety of the equipment is improved. And workers only need to inspect regularly, so that the workload of the workers is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heating of insulating gas electrical equipment, and specifically to an automatic heating device for preventing low-temperature cracking of gaskets of sulfur hexafluoride electrical equipment; it is used for anti-cracking operation of sulfur hexafluoride electrical equipment. Background Technique

[0002] In most parts of northern China, winter is relatively cold. For sulfur hexafluoride electrical equipment in this area, including circuit breakers, voltage transformers, and current transformers, when the external environmental temperature is relatively low, the gaskets at the gas chamber flange joints will harden and crack, resulting in sulfur hexafluoride gas leakage, a decrease in equipment pressure, a significant decline in the arc extinguishing ability and insulation level of sulfur hexafluoride gas, insufficient insulation performance and breaking ability of the equipment, and in severe cases, electrical equipment alarm and locking, affecting the safe operation of the power grid. Currently, there are mainly two measures to solve sulfur hexafluoride gas leakage: one is to supplement new gas, and the other is to replace the new gasket by power outage. Although the above two measures can basically meet the operation requirements, supplementing new gas only treats the symptoms but not the root cause; the other power outage replacement has a large impact.

[0003] In the prior art, the Chinese authorized patent publication number: CN 115751186 A, discloses an automatic heating device for sulfur hexafluoride electrical equipment gas, which includes a constant heating chamber, a constant gas supplementing chamber, a tail gas tank, a vacuum pump, and a compression pump. The constant heating chamber is provided with a heater and a temperature controller. The first intake end at the upper part of the constant heating chamber is fixedly connected to a gas discharge pipeline. A heating chamber vacuum pipeline is fixedly connected between the outlet end at the lower part of the constant heating chamber and the first intake end of the vacuum pump. A tail gas pipeline is fixedly connected between the outlet end of the vacuum pump and the tail gas tank. A gas supplementing chamber vacuum pipeline is fixedly connected between the outlet end at the lower part of the constant gas supplementing chamber and the second intake end of the vacuum pump. By automatically operating the processes of discharging, gas supplementing, and heating of sulfur hexafluoride gas in the gas-filled electrical equipment, the present invention avoids the occurrence of low-temperature liquefaction phenomenon of sulfur hexafluoride gas-filled electrical equipment, eliminates potential safety hazards of the equipment, and the staff only needs to conduct regular inspections, greatly reducing the workload of personnel. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to disclose an automatic heating device for preventing low-temperature cracking of gaskets of sulfur hexafluoride electrical equipment in view of the deficiencies of the prior art, and solve the problem of gasket cracking in low-temperature environments.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: An automatic heating device for preventing low-temperature cracking of gaskets of sulfur hexafluoride electrical equipment, including that the automatic heating device includes a gasket and a sulfur hexafluoride gas chamber that can be sequentially sleeved from the inside to the outside on the inner wall of the connection part between the electrical equipment and the flange.

[0006] The automatic heating device further includes a gas medium layer, a heating tape, a heat insulation film, and a housing that can be sleeved on the outer wall of the flange connection part of the electrical equipment from the inside to the outside in sequence;

[0007] The automatic heating device has an overall circular structure, and the automatic heating device is wrapped around the flange connection part of the electrical equipment;

[0008] A temperature sensor for measuring the temperature of the inner cavity is installed on the inner wall of the heating tape. The heating tape is electrically connected to a heating controller for changing the temperature of the inner cavity, and the heating controller is electrically connected to a temperature data collector.

[0009] Furthermore:

[0010] The gas medium layer is filled with air inside, and the sulfur hexafluoride gas chamber is filled with sulfur hexafluoride gas for arc extinguishing.

[0011] Furthermore:

[0012] The sealing gasket is made of ethylene propylene diene monomer rubber;

[0013] The heat insulation film is made of PET substrate;

[0014] The heating tape is made of a conductive polymer composite material.

[0015] Furthermore:

[0016] The temperature sensor senses the temperature of the inner cavity in real time. When the temperature sensed by the temperature sensor is ≤ 0 °C, the heating tape starts to heat. When the temperature sensed by the temperature sensor is ≥ 20 °C, the heating tape stops heating.

[0017] Furthermore:

[0018] The temperature data collector automatically collects temperature change data and sends the temperature change data to the heating controller and the staff; the heating controller starts or stops the heating tape according to the received temperature of the inner cavity.

[0019] Furthermore:

[0020] The heating tape increases or decreases the number of the heating tapes according to the ambient temperature where the sulfur hexafluoride electrical equipment is located to ensure precise temperature control.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] An automatic heating device for preventing low-temperature cracking of gaskets in sulfur hexafluoride electrical equipment can accurately control the ambient temperature of the gasket at the flange according to the ambient temperature changes collected by the temperature sensor, ensuring that the gasket will not harden and crack at extremely low temperatures in winter, thereby preventing the decline of the arc extinguishing ability and insulation level of sulfur hexafluoride gas, resulting in insufficient insulation performance and breaking ability of the equipment, leading to alarm and locking of electrical equipment. At the same time, in the traditional method, the staff only needs to conduct regular inspections, and this invention greatly reduces the workload of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. is a schematic diagram of the appearance of the automatic heating device of the present invention;

[0024] Figure 2 FIG. is an installation diagram of the automatic heating device of the present invention at the flange;

[0025] Figure 3 FIG. is a schematic sectional view of the automatic heating device of the present invention at position A.

[0026] Description of the reference numerals:

[0027] 1 - heat insulation film, 2 - heating tape, 3 - gas medium layer, 4 - flange, 5 - gasket, 6 - sulfur hexafluoride gas chamber, 7 - temperature sensor, 8 - heating controller, 9 - temperature data collector, 10 - housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1:

[0030] As shown in Figure 1 and 2 , which shows a schematic diagram of the appearance of the automatic heating device of the present invention. The automatic heating device is wrapped around the connection part between the sulfur hexafluoride electrical equipment and the flange 4. The heating and temperature control process of the automatic heating device runs automatically without manual operation. The staff only needs to increase or decrease the number of heating tapes 2 under different seasons and temperatures;

[0031] Embodiment 2:

[0032] As shown in Figure 3 , which shows a sectional view of the present invention at position A, including that the automatic heating device includes a gasket 5 and a sulfur hexafluoride gas chamber 6 that can be sequentially sleeved on the inner wall of the connection part between the electrical equipment and the flange 4 from the inside to the outside;

[0033] The automatic heating device further includes a gas medium layer 3, a heating tape 2, a heat insulation film 1, and a housing 10 that can be sleeved on the outer wall of the connection part between the electrical equipment and the flange 4 from the inside to the outside in sequence;

[0034] The automatic heating device has an overall circular structure, and the automatic heating device wraps around the connection flange 4 of the electrical equipment;

[0035] A temperature sensor 7 for measuring the inner cavity temperature is installed on the inner wall of the heating tape 2. The heating tape 2 is electrically connected to a heating controller 8 for changing the inner cavity temperature, and the heating controller 8 is electrically connected to a temperature data collector 9.

[0036] The gas medium layer 3 is filled with air inside, and the sulfur hexafluoride gas chamber 6 is filled with sulfur hexafluoride gas for arc extinguishing.

[0037] The sealing gasket 5 is made of ethylene propylene diene monomer rubber;

[0038] Preferably, the heat insulation film 1 is made of PET substrate; the heat insulation film is wrapped inside the housing, and it plays a role in heat resistance and temperature reduction when exposed to the sun in summer, which can effectively prevent external heat from entering. In winter, the external environment is relatively low, and the heat insulation film can effectively prevent external low temperature from entering the sulfur hexafluoride electrical equipment to achieve the purpose of heat preservation;

[0039] The heating tape 2 is made of a conductive polymer composite material. The heating tape 2 is used for heating to keep the inner cavity temperature of the sulfur hexafluoride electrical equipment at 20°C. If the sulfur hexafluoride electronic equipment is applied in an extremely cold area of -30°C, the staff will install 3 such heating tapes 2 according to the local environment and external temperature during installation, so as to ensure accurate temperature control under extremely cold conditions.

[0040] The temperature sensor 7 senses the inner cavity temperature in real time. When the temperature sensed by the temperature sensor 7 is ≤0°C, the heating tape 2 starts to heat. When the temperature sensed by the temperature sensor 7 is ≥20°C, the heating tape 2 stops heating; two temperature sensors can be installed for the temperature sensor 7 according to the installation area and ambient temperature to form a double insurance and accurately sense the temperature in real time;

[0041] The temperature data collector 9 automatically collects temperature change data and sends the data to the heating controller 8 and the staff; the heating controller 8 starts or stops the heating tape 2 according to the received inner cavity temperature; the heating process of the heating controller 8 and the heating tape is fully automatic without manual operation, which greatly reduces the workload of the staff. The temperature data collector 9 can send the temperature data to the staff through the network to form data sharing.

[0042] The heating tape 2 increases or decreases the number of the heating tapes 2 according to the precise temperature control requirements guaranteed by the ambient temperature of the sulfur hexafluoride electrical equipment.

[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic heating device to prevent the sealing gasket of sulfur hexafluoride electrical equipment from cracking at low temperature. Features: The automatic heating device comprises a sealing gasket (5) and a sulfur hexafluoride gas chamber (6) which can be sequentially sleeved on the inner wall of the connection part between the electrical equipment and the flange (4) from the inside to the outside; The automatic heating device also includes a gas medium layer (3), a heating belt (2), a heat insulation film (1) and a housing (10) which can be sequentially sleeved on the outer wall of the connection portion between the electrical equipment and the flange (4) from the inside to the outside; The automatic heating device has an overall circular structure, and the automatic heating device is wrapped around the connecting flange (4) of the electrical equipment; A temperature sensor (7) for measuring the temperature of the inner cavity is installed on the inner wall of the heating belt (2); the heating belt (2) is electrically connected to a heating controller (8) for changing the temperature of the inner cavity; and the heating controller (8) is electrically connected to a temperature data collector (9).

2. An automatic heating device for preventing the sealing gasket of sulfur hexafluoride electrical equipment from cracking at low temperature according to claim 1, Features: The gas medium layer (3) is filled with air, and the sulfur hexafluoride gas chamber (6) is filled with sulfur hexafluoride gas for arc extinguishing.

3. An automatic heating device for preventing low-temperature cracking of sulfur hexafluoride electrical equipment sealing gaskets according to claim 1, Features: The sealing gasket (5) is made of EPDM rubber; The material of the thermal insulation film (1) is a PET substrate; The heating belt (2) is made of a conductive polymer composite material.

4. An automatic heating device for preventing the sealing gasket of sulfur hexafluoride electrical equipment from cracking at low temperature according to claim 1, Features: The temperature sensor (7) senses the inner cavity temperature in real time. When the temperature sensed by the temperature sensor (7) is ≤0°C, the heating belt (2) starts to heat. When the temperature sensed by the temperature sensor (7) is ≥20°C, the heating belt (2) stops heating.

5. The automatic heating device for preventing the sealing gasket of sulfur hexafluoride electrical equipment from cracking at low temperature according to claim 1, Features: The temperature data collector (9) automatically collects temperature change data and sends the temperature change data to the heating controller (8) and staff; The heating controller (8) starts or stops the heating belt (2) according to the received inner cavity temperature.

6. An automatic heating device for preventing the sealing gasket of sulfur hexafluoride electrical equipment from cracking at low temperature according to claim 1, Features: The heating belt (2) is increased or decreased in number according to the ambient temperature of the sulfur hexafluoride electrical equipment to ensure accurate temperature control.

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