Gas insulation system and use method thereof

Abstract

The invention discloses a gas insulation system, and relates to the technical field of electrical equipment, the gas insulation system comprises a main body unit, the main body unit comprises a cavity and insulation equipment in the cavity, and the cavity is filled with insulation gas; the monitoring unit comprises a temperature sensor and a discharge monitoring sensor which are respectively used for monitoring the temperature and the discharge condition in the cavity; the temperature adjusting unit is used for controlling the temperature change in the cavity; and the control unit is respectively connected with the monitoring unit and the temperature adjusting unit and is used for sending an execution command to the temperature adjusting unit according to a feedback command of the monitoring unit. The temperature automatic adjusting system is arranged outside the equipment filled with the insulating gas, when partial discharge occurs in the equipment and the temperature rises, the temperature adjusting device can automatically cool the equipment, and then the insulating effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a gas insulation system and a use method thereof. Background Art

[0002] SF 6 Gas is widely used in power systems due to its excellent electrical insulation and arc extinguishing properties, especially in high-voltage switchgear, transformers and gas insulated switchgear (GIS). 6 The high insulation performance of power equipment may be affected by partial discharge (PD) under certain special conditions, such as high voltage, high temperature, and areas with concentrated strong electric fields. PD is one of the important factors that lead to the degradation of the insulation performance of power equipment. Long-term PD may even cause the breakdown of the insulation material, leading to serious failure of the equipment.

[0003] PD is usually caused by uneven electric field distribution, defects in the insulating medium, or changes in environmental conditions during equipment operation. This discharge can cause SF 6 Partial decomposition of the gas to produce chemically active decomposition products, such as SOF 2 、SO 2 , HF, etc. These decomposition products will not only further corrode the metal parts inside the equipment, but also cause secondary damage to the insulating medium, further deteriorating the insulation state of the equipment. Therefore, how to effectively control and suppress partial discharge has become a key issue in improving SF 6 An important research direction for the safety and reliability of gas-insulated equipment.

[0004] Although in the prior art, people have tried to 6 With N 2 Mixing reduces the overall discharge tendency of the gas. 6 / N 2 The gas weakens the discharge phenomenon to some extent, but since the occurrence of partial discharge is closely related to the ambient temperature, the discharge phenomenon cannot be completely avoided at high temperatures. In this context, temperature control technology has gradually attracted the attention of researchers. Studies have shown that the reduction of temperature can significantly improve the insulation performance of the gas. Therefore, by controlling the SF 6 Mixed 2 The body temperature can further reduce the occurrence of partial discharge.

[0005] In the current technical solution, the existing SF 6 / N 2Most hybrid gas insulation technologies lack precise control over gas temperature. The intensity and frequency of partial discharge fluctuate with temperature changes, especially when the ambient temperature rises, the incidence and intensity of partial discharge will increase significantly. This not only affects the operational safety of the equipment, but may also cause premature aging of the equipment. Therefore, how to suppress partial discharge through temperature control has become one of the current problems that need to be solved urgently.

[0006] The present invention is proposed based on this, by 6 / N 2 The introduction of a temperature control device into the hybrid gas insulation system can effectively reduce the temperature of the gas in the cavity, thereby reducing the occurrence of partial discharge and improving the insulation performance and safety of the equipment. Summary of the invention

[0007] In view of the above problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the problem to be solved by the present invention is that the existing gas insulation technology lacks precise control of temperature.

[0009] To solve the above technical problems, the present invention provides the following technical solutions: a gas insulation system, comprising a main unit, including a cavity and an insulating device therein, wherein the cavity is filled with insulating gas; a monitoring unit, including a temperature sensor and a discharge monitoring sensor, which are respectively used to monitor the temperature and discharge conditions in the cavity; a temperature adjustment unit, which is used to control the temperature change inside the cavity; and a control unit, which is respectively connected to the monitoring unit and the temperature adjustment unit, and issues an execution command to the temperature adjustment unit according to the feedback command of the monitoring unit.

[0010] As a preferred solution of the gas insulation system of the present invention, a detachably connected transparent flange is provided at the end of the cavity, and a gas injection port is also provided on the side wall of the cavity.

[0011] As a preferred solution of the gas insulation system of the present invention, the temperature sensors are evenly arranged inside the cavity; the discharge monitoring sensors are arranged on the outer wall of the cavity, and include ultrasonic sensors and ultra-high frequency sensors.

[0012] As a preferred solution of the gas-insulated system of the present invention, the monitoring unit further comprises an oscilloscope, and the oscilloscope is respectively connected to the discharge monitoring sensor and the control unit.

[0013] As a preferred solution of the gas insulation system of the present invention, the temperature regulating unit includes a temperature regulating belt and a compressor arranged outside the cavity, the temperature regulating belt is used to regulate the temperature inside the cavity, and the compressor is used for refrigeration.

[0014] As a preferred solution of the gas-insulated system of the present invention, the control unit includes a central control module and a display unit, and the central control module is connected to the temperature sensor, the oscilloscope and the temperature adjustment unit respectively.

[0015] As a preferred solution of the gas-insulated system of the present invention, the monitoring unit further comprises a first capacitor, a second capacitor, a third capacitor and a resistor connected to the oscilloscope, wherein the first capacitor and the second capacitor are connected in series, and the third capacitor is connected in series with the resistor; the connection point between the first capacitor and the second capacitor and the connection point between the third capacitor and the resistor are respectively connected to the oscilloscope.

[0016] As a preferred solution of the gas insulation system of the present invention, the insulating gas filled in the cavity is SF 6 and N 2 A mixed gas of which SF 6 The proportion is 70% to 80%, N 2 The proportion is 20% to 30%.

[0017] On the other hand, the present invention also provides a method for using a gas insulation system, which is applicable to the above-mentioned gas insulation system, and the method includes monitoring the discharge situation in the cavity through a discharge monitoring sensor; monitoring the temperature change in the cavity through a temperature sensor; when the discharge monitoring sensor detects a discharge signal, if the temperature sensor detects that the temperature in the cavity increases, then starting the temperature adjustment unit to cool the cavity.

[0018] As a preferred scheme of the method of using the gas insulation system of the present invention, wherein: the discharge monitoring sensor includes an ultrasonic sensor and a UHF sensor; the temperature regulating unit includes a temperature regulating belt and a compressor arranged outside the cavity, the temperature regulating belt is used to regulate the temperature inside the cavity, and the compressor is used for cooling.

[0019] The beneficial effect of the present invention is that by arranging an automatic temperature adjustment system outside the device filled with insulating gas, when local discharge occurs inside the device and the temperature rises, the temperature adjustment device can automatically cool the device, thereby improving the insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is the overall structure diagram of the gas insulation system. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0025] Example 1

[0026] Reference Figure 1 , which is the first embodiment of the present invention, provides a gas insulation system, which includes a main unit 100, a monitoring unit 200, a temperature control unit 300 and a control unit 400.

[0027] Specifically, the main unit 100 includes a cavity 101 and an insulating device 102 inside the cavity 101. The cavity 101 is filled with insulating gas. The insulating device 102 is a pot insulator, and the insulating gas is SF 6 and N 2 of mixed gases.

[0028] The monitoring unit 200 includes a temperature sensor 201 and a discharge monitoring sensor 202. A plurality of temperature sensors 201 are provided and evenly installed inside the cavity 101 to monitor the temperature inside the cavity 101. A plurality of discharge sensors 202 are also provided and evenly installed outside the cavity 101 to monitor the discharge condition inside the cavity 101.

[0029] The temperature adjustment unit 300 includes a refrigeration device, which is installed outside the cavity 101 and is used to cool the cavity 101 .

[0030] The control unit 400 is connected to the monitoring unit 200 and the temperature adjustment unit 300. When the monitoring unit 200 detects that partial discharge occurs inside the cavity 101 and the temperature rises, the control unit 400 sends a command to the temperature adjustment unit 300, and the refrigeration device starts to start refrigeration, thereby reducing the internal temperature of the cavity 101.

[0031] Example 2

[0032] Reference Figure 1 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0033] Specifically, a transparent flange 101a is provided at the end of the cavity 101. The transparent flange 101a is made of organic glass and is detachably connected to the cavity 101. When a more intense discharge occurs inside the cavity 101, the discharge inside can be better observed through the transparent flange 101a. The cavity 101 is also provided with at least one gas injection port 101b for injecting a mitigating insulating gas. The insulating gas is preferably SF 6 and N 2 A mixed gas of which SF 6 The proportion is 70% to 80%, N 2 The ratio is 20% to 30%. After filling, ensure that the equipment cavity 101 is well sealed and the gas is evenly distributed to achieve a good insulation effect.

[0034] Preferably, the temperature sensor 201 is provided with a plurality of sensors, which are evenly installed on the inner wall of the cavity 101, and the discharge monitoring sensor 202 includes an ultrasonic sensor 202a and a UHF sensor 202b, which are installed on the outer wall of the cavity 101 and are both connected to the oscilloscope 203. If partial discharge occurs inside the cavity 101, the oscilloscope 203 will produce a waveform of partial discharge. In addition, the oscilloscope 203 is also connected with the first capacitor C1, the second capacitor C2, the third capacitor C3 and the resistor Z. Among them, the first capacitor C1 is connected in series with the second capacitor C2, the third capacitor C3 is connected to the resistor Z, and the other end of the second capacitor C2 and the resistor Z is grounded. The connection between the first capacitor C1 and the second capacitor C2, and the connection between the third capacitor C3 and the resistor Z are all connected to the oscilloscope 203. It should be noted that the insulating device (in this embodiment, a basin insulator) inside the cavity 101 is connected to a high-voltage power supply without partial discharge through a high-voltage bushing. The first capacitor C1 and the third capacitor C3 are both connected to a high-voltage power supply without partial discharge.

[0035] The temperature regulating unit 300 includes a temperature regulating belt and a compressor arranged outside the cavity 101. The temperature regulating belt is attached to the surface of the cavity 101 for heat exchange, and the compressor is used for cooling.

[0036] Furthermore, the control unit 400 includes a central control module 401 and a display unit 402, and the central control module 401 communicates with the display unit via RS485.

[0037] When in use, temperature sensors 201 are arranged at key positions of the cavity 101 to monitor the temperature changes in the cavity 101 in real time. During normal operation, the temperature sensor 101 records and feeds back the internal temperature data of the device and transmits it to the central control module 401. If the temperature is maintained within a safe range, the device continues to operate normally and the system does not make any adjustments.

[0038] When the oscilloscope 203 shows that partial discharge occurs inside the cavity 101, if the local temperature rises rapidly, the temperature sensor 201 will sense the temperature change and feed the data back to the central control module 401. The central control module analyzes the temperature change, and once the temperature exceeds the preset safety value (such as 40°C), the dynamic temperature adjustment belt located outside the device is activated. The temperature adjustment belt starts working to reduce the cavity temperature. The temperature adjustment belt quickly reduces the external temperature of the device through compressor cooling and other means, thereby reducing the internal partial discharge phenomenon.

[0039] During the operation of the temperature regulating belt, the temperature sensor 201 continuously monitors the temperature of the cavity 101. When the temperature drops to a safe range (such as below 35°C), the central control module 401 instructs the temperature regulating belt to stop working. The system returns to normal operation and the device temperature remains within a safe range.

[0040] Example 3

[0041] Reference Figure 1 , which is the third embodiment of the present invention, and is based on the first two embodiments. This embodiment provides a method for using a gas insulation system, which is applicable to the gas insulation system described in Embodiment 1 and Embodiment 2. The method comprises:

[0042] First, fill the cavity with a preset ratio of SF 6 With N 2 A mixture of SF 6 The ratio is 70%-80%, N 2 20%-30%. Using SF 6 High insulation and N 2 Multiple temperature sensors 201 are arranged inside the device to monitor the temperature changes in the cavity in real time, and ultrasonic sensors 202a and UHF sensors 202b are arranged outside the cavity 101 to ensure that any temperature fluctuations can be responded to in a timely manner.

[0043] Next, the temperature inside the cavity 101 is adjusted by the temperature adjustment unit 300. The temperature adjustment unit 300 is installed outside the cavity 101. Once the temperature sensor 201 detects that the temperature inside the cavity 101 exceeds the preset threshold, the temperature adjustment unit 300 automatically starts and uses a dynamic temperature adjustment device (such as compressor refrigeration or liquid nitrogen cooling) to reduce the internal temperature to a safe range.

[0044] The central control module 401 receives the sensor data and instructs the temperature adjustment unit 300 to work, ensuring that the equipment operates under the optimal temperature conditions to prevent the occurrence of partial discharge.

[0045] In response to the needs of different application environments, the temperature adjustment unit 300 can be adaptively adjusted according to changes in the external environment temperature. For example, in a high temperature environment, the system will automatically increase the cooling frequency to keep the internal temperature of the device within a safe range to avoid partial discharge caused by high temperature.

[0046] After the data collected by the temperature sensor 201 is transmitted to the central control module 401, the central control module 401 analyzes the temperature data and determines whether it is necessary to start the external temperature adjustment unit 300 for adjustment. At the same time, all temperature change data and system operation status information are visually output through the display unit 402, and the operator can monitor the temperature inside the device in real time.

[0047] Preferably, the temperature sensors 201 are evenly arranged in different areas of the cavity 101 to ensure comprehensive monitoring of the temperature changes inside the entire device. The temperature adjustment unit 300 performs local adjustments according to the temperature changes in each area of ​​the cavity 101 to prevent discharge caused by local overheating. In addition, the design of the present invention can be applied to various high-voltage switchgear and transformer scenarios to ensure long-term stable operation of the equipment.

[0048] Preferably, the system of the present invention can also flexibly adjust SF according to the operation requirements of the equipment. 6 With N 2 For example, in high voltage switchgear, SF 6 The ratio can be increased to 85% to enhance the insulation effect, while in mild environments the SF 6 ratio, achieving the effect of energy saving and emission reduction.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gas insulation system, characterized in that: include, The main unit (100) comprises a cavity (101) and an insulating device (102) inside the cavity, wherein the cavity (101) is filled with insulating gas; A monitoring unit (200), comprising a temperature sensor (201) and a discharge monitoring sensor (202), which are used to monitor the temperature and discharge conditions in the cavity (101), respectively; A temperature regulating unit (300) for controlling temperature changes inside the cavity (101); The control unit (400) is connected to the monitoring unit (200) and the temperature adjustment unit (300) respectively, and issues an execution command to the temperature adjustment unit (300) according to the feedback command of the monitoring unit (200).

2. The gas insulated system according to claim 1, characterized in that: A detachably connected transparent flange (101a) is provided at the end of the cavity (101), and a gas injection port (101b) is also provided on the side wall of the cavity (101).

3. The gas insulated system according to claim 2, characterized in that: The temperature sensor (201) is evenly arranged inside the cavity (101); the discharge monitoring sensor (202) is arranged on the outer wall of the cavity (101), and comprises an ultrasonic sensor (202a) and a UHF sensor (202b).

4. The gas insulated system according to claim 3, characterized in that: The monitoring unit (200) further comprises an oscilloscope (203), wherein the oscilloscope (203) is respectively connected to the discharge monitoring sensor (202) and the control unit (400).

5. The gas insulated system according to claim 4, characterized in that: The temperature regulating unit (300) comprises a temperature regulating belt arranged outside the cavity (101) and a compressor, the temperature regulating belt is used to regulate the temperature inside the cavity (101), and the compressor is used for refrigeration.

6. The gas-insulated system according to claim 5, characterized in that: The control unit (400) comprises a central control module (401) and a display unit (402), and the central control module (401) is respectively connected to the temperature sensor (201), the oscilloscope (203) and the temperature adjustment unit (300).

7. The gas-insulated system according to claim 6, characterized in that: The monitoring unit (200) further comprises a first capacitor (C1), a second capacitor (C2), a third capacitor (C3) and a resistor (Z) connected to the oscilloscope (203), wherein the first capacitor (C1) and the second capacitor (C2) are connected in series, and the third capacitor (C3) and the resistor (Z) are connected in series; the connection point between the first capacitor (C1) and the second capacitor (C2), and the connection point between the third capacitor (C3) and the resistor (Z) are respectively connected to the oscilloscope (203).

8. The gas-insulated system according to claim 7, characterized in that: The insulating gas filled in the cavity (101) is a mixed gas of SF6 and N2, wherein the proportion of SF6 is 70% to 80% and the proportion of N2 is 20% to 30%.

9. A method for using a gas insulation system, characterized in that: The gas insulation system according to any one of claims 1 to 8 is applicable, and the method comprises: Monitoring the discharge condition in the cavity (100) by means of a discharge monitoring sensor (202); Monitoring temperature changes in the cavity (100) by means of a temperature sensor (201); When the discharge monitoring sensor (202) detects a discharge signal, if the temperature sensor (201) detects that the temperature in the cavity (100) has increased, the temperature adjustment unit (300) is activated to cool the cavity (100).

10. The method for using the gas insulation system according to claim 9, characterized in that: The discharge monitoring sensor (202) comprises an ultrasonic sensor (202a) and a UHF sensor (202b); the temperature regulating unit (300) comprises a temperature regulating belt and a compressor arranged outside the cavity (100); the temperature regulating belt is used to regulate the temperature inside the cavity (101); and the compressor is used for cooling.

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