A new circuit breaker heating device
Patent Information
- Application Number
- CN202521509460.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-18
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-07-18
AI Technical Summary
当环境温度骤降时，金属材料的导电性能会随温度降低而下降，导致接触电阻增大；同时，低温会使SF6气体液化而造成压力下降，从而降低了断路器的绝缘性能和开断能力
[0013]本发明所述的新型断路器加热装置，可适用于363kV、550kV、800kV等不同电压等级断路器的加热装置。伴热板采用温控分段投切方式，根据环境温度的不同，工作的伴热板数量不同，需投入的功率也不同，以满足不同环境温度下的断路器的加热需求。
Smart Images
Figure CN224909686U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of high-voltage switchgear technology, specifically to a novel circuit breaker heating device. Background Technology
[0002] In modern power systems, high-voltage switchgear is one of the core components ensuring the safe and stable operation of the power grid. As a core component of high-voltage switchgear, circuit breakers play a crucial role in quickly interrupting fault currents and isolating faulty areas when power system failures occur. Their performance directly affects the reliability and safety of the power grid. However, high-voltage circuit breakers are typically deployed in outdoor substations or high-altitude, cold regions, facing the challenge of extreme environmental temperature variations over long periods. Especially in northern my country and high-altitude areas, winter temperatures can drop to below -40°C, posing a significant threat to the normal operation of circuit breakers.
[0003] The core conductive components inside a circuit breaker (such as moving contacts, stationary contacts, and conductive rods) and the mechanical transmission components in the operating mechanism (such as springs, gears, and bearings) are extremely sensitive to temperature changes. When the ambient temperature drops sharply, the conductivity of metallic materials decreases with decreasing temperature, leading to increased contact resistance. Simultaneously, low temperatures cause SF6 gas to liquefy, resulting in a pressure drop, which reduces the circuit breaker's insulation performance and breaking capacity. The combined effect of these factors can lead to the following problems with the circuit breaker: reduced opening and closing speed, insufficient contact pressure, and decreased arc-extinguishing performance. In severe cases, it can even cause failure to open or close, directly threatening the safe and stable operation of the power grid. Utility Model Content
[0004] To solve the above problems, this utility model provides a circuit breaker heating device that can realize segmented switching.
[0005] A novel circuit breaker heating device includes an arc-shaped heat tracing plate that is attached to the outside of the circuit breaker. The heat tracing plate consists of an upper plate and a lower plate, which are connected by screws. The upper plate is made of insulation material, and the lower plate has a three-layer structure, consisting of a heating layer, an EPDM foam insulation layer, and a stainless steel protective layer from the inside out. A junction box is provided outside the stainless steel protective layer.
[0006] The aforementioned novel circuit breaker heating device has a temperature and humidity controller sensor installed at the connection between the heat tracing plate and the circuit breaker.
[0007] The aforementioned novel circuit breaker heating device has one end of a cold-pressed terminal connected in sequence to a copper conductor unsheathed cable and a screw clip, and the other end grounded.
[0008] The aforementioned novel circuit breaker heating device has a lower heat tracing plate divided into four heating zones, which are sequentially heated zone I, heating zone II, heating zone III, and heating zone IV along the arc of the circuit breaker's exterior.
[0009] The heating device for a novel circuit breaker described above has heating power of 1000W for heating zone I and heating zone IV, and heating power of 2000W for heating zone II and heating zone III.
[0010] This utility model is implemented by including an integrated heat tracing plate, a temperature and humidity controller sensor, cold-pressed terminals, and copper conductor unsheathed cables, all of which are installed outside the circuit breaker housing. The integrated heat tracing plate consists of an upper plate and a lower plate. The upper plate has no heating function and only serves for insulation and protection. The lower plate contains four heating zones. The lower plate has a three-layer structure: the inner layer closest to the circuit breaker housing is the heating layer; the middle layer is a 20mm EPDM foam insulation layer to reduce heat loss from the heater; and the outermost layer is a 1.5mm stainless steel protective layer, used to fix the insulation and heating layers, and also serves to prevent dust and rain. A junction box is installed on the stainless steel protective layer for connecting the leads from the internal heating layer. The upper and lower heat tracing plates are connected and fixed by adjustable screws. The lower heat tracing plate has four heating zones, with two zones in operation and the other two as backups. In the event of a failure in any heating zone, the backup heating zone with the corresponding power can be switched instantly. The lower heat tracing plate adopts a temperature-controlled segmented switching method. Depending on the ambient temperature, the number of heating zones operating on the heat tracing plate and the required power also vary to meet the heating needs of the circuit breaker under different ambient temperatures.
[0011] Compared to single-stage switching circuit breaker heating devices, segmented switching can control the heating power of the heat tracing plate according to different ambient temperatures, so that the heating device is in a suitable working state and avoids unnecessary impact on the normal operation of the circuit breaker.
[0012] Beneficial effects of this utility model
[0013] The novel circuit breaker heating device described in this invention is applicable to heating circuit breakers of different voltage levels, such as 363kV, 550kV, and 800kV. The heat tracing plates employ a temperature-controlled segmented switching method. The number of operating heat tracing plates and the required power vary depending on the ambient temperature, thus meeting the heating needs of the circuit breakers under different ambient temperatures.
[0014] The novel circuit breaker heating device of the present invention has a lower plate divided into 4 heating zones, including main and backup heating zones. When any zone fails, the backup heat tracing plate with the corresponding power can be switched instantly. Attached Figure Description
[0015] Figure 1 : Schematic diagram of circuit breaker heating device assembly.
[0016] Figure 2 : Schematic diagram of the circuit breaker heating device.
[0017] Figure 3 : Unfolded diagram of the lower heat tracing plate.
[0018] The diagram is labeled as follows: 1. Heating plate, 1-1 Upper plate, 1-2 Lower heating plate, 1-21 Heating layer, 1-22 EPDM foam insulation layer, 1-23 Stainless steel protective layer, 1-24 Heating zone I, 1-25 Heating zone II, 1-26 Heating zone III, 1-27 Heating zone IV, 1-28 Junction box opening position, 2-Temperature and humidity control sensor, 3-Cold-pressed terminal, 4-Copper conductor unsheathed cable, 5-Screw fastener, 6-Junction box. Detailed Implementation
[0019] like Figure 1-3 As shown, a novel circuit breaker heating device includes an arc-shaped heat tracing plate 1 that is attached to the outside of the circuit breaker. The heat tracing plate 1 consists of an upper plate 1-1 and a lower heat tracing plate 1-2. The upper plate 1-1 and the lower heat tracing plate 1-2 are connected by an adjustable screw 5. The upper plate 1-1 and the lower heat tracing plate 1-2 cover the outside of the circuit breaker. The upper plate 1-1 is made of thermal insulation material. The lower heat tracing plate 1-2 has a three-layer structure, consisting of a heating layer 1-21, a EPDM foam insulation layer 1-22, and a stainless steel protective layer 1-23 from the inside out. The stainless steel protective layer 1-23 has a junction box opening position 1-28 that is connected to the junction box 6.
[0020] A temperature and humidity controller sensor 2 is installed at the connection between the heat tracing plate 1 and the circuit breaker.
[0021] One end of the cold-pressed terminal 3 is connected to the copper conductor unsheathed cable 4, and the other end is grounded.
[0022] The lower heating plate 1-2 is divided into four heating zones, sequentially arranged along the arc of the circuit breaker's exterior: heating zone I1-24, heating zone II1-25, heating zone III1-26, and heating zone IV1-27. Heating zones I1-24 and IV1-27 have a heating power of 1000W, while heating zones II1-25 and III1-26 have a heating power of 2000W. The ambient temperature is sensed by the temperature and humidity controller 2; when the ambient temperature reaches -23℃ or lower, Figure 3Heating zones II1-25 automatically switch on and off, with a power output of 2000W. Heating zones II1-25 and III1-26 serve as backups for each other. Heating stops when the temperature rises to -18℃. When the ambient temperature continues to drop to -29℃ or lower, heating zone IV1-27 automatically switches on and off, operating simultaneously with heating zone II1-25. The power output increases by 1000W, bringing the total power to 3000W. Heating zones II1-25 and III1-26 serve as backups for each other, as do heating zones I1-24 and IV1-27. Heating zone IV1-27 stops heating when the temperature rises to -24℃, while heating zone II1-25 continues heating until the temperature reaches -18℃.
Claims
1. A novel circuit breaker heating device, characterized in that, It includes an arc-shaped heat tracing plate (1) that is attached to the outside of the circuit breaker. The heat tracing plate (1) consists of an upper plate (1-1) and a lower heat tracing plate (1-2). The upper plate (1-1) and the lower heat tracing plate (1-2) are connected by a screw thread (5). The upper plate (1-1) is made of heat insulation material. The lower heat tracing plate (1-2) has a three-layer structure, consisting of a heating layer (1-21), a EPDM foam insulation layer (1-22), and a stainless steel protective layer (1-23) from the inside out. A junction box (6) is provided on the outside of the stainless steel protective layer (1-23).
2. The novel circuit breaker heating device according to claim 1, characterized in that, A temperature and humidity controller sensor (2) is installed at the connection between the heat tracing plate (1) and the circuit breaker.
3. The novel circuit breaker heating device according to claim 1, characterized in that, One end of the cold-pressed terminal (3) is connected to the copper conductor unsheathed cable (4) and the screw buckle (5) in sequence, and the other end is grounded.
4. The novel circuit breaker heating device according to claim 1, characterized in that, The lower heat tracing plate (1-2) is divided into 4 heating zones, which are heating zone I (1-24), heating zone II (1-25), heating zone III (1-26), and heating zone IV (1-27) along the arc of the outside of the circuit breaker.
5. A novel circuit breaker heating device according to claim 4, characterized in that, The heating power of heating zone I (1-24) and heating zone IV (1-27) is 1000W, and the heating power of heating zone II (1-25) and heating zone III (1-26) is 2000W.