CN101075729B - Environment-friendly gas insulated combined electrical apparatus - Google Patents

Abstract

The present invention relates to an environmentally friendly gas-insulated combined electrical appliance, wherein the combined electrical appliance has several sealed containers filled with dry low-pressure pure air, each sealed container contains several switch devices, and insulating spacers are connected between the sealed container and the external circuit and between each sealed container. The pressure of the dry low-pressure pure air is 0-0.1MPa, and the water content of the dry low-pressure pure air is below the dew point of -40°C. The environmentally friendly gas-insulated combined electrical appliance with this structure meets the requirements for gas-insulated combined electrical appliances, innovates the shape and configuration of live components, and obtains an environmentally friendly gas-insulated combined electrical appliance with better air insulation effect; and there is no need to use non-recyclable insulating barriers made of epoxy resin that will cause environmental pollution between the live parts, and when the electrical appliance is maintained or repaired, the pure air in the sealed container can be directly discharged, and after the repair is completed, it can be directly filled with commercially available pure air, which is safer and more convenient than before.

Description

Environmentally friendly gas insulated combined electrical appliances

technical field

The invention relates to the field of power transmission and distribution systems in power systems, in particular to the field of insulated combined electrical appliances with a rated voltage level below 12kV (inclusive) in the power transmission and distribution system, and specifically refers to an environment-friendly gas-insulated combined electrical appliance.

Background technique

As we all know, air or sulfur hexafluoride is used as the insulating gas between the disconnecting electrodes, between the grounding electrodes, between the phase electrodes or between the charged parts in the gas-insulated combined electrical apparatus; sulfur hexafluoride is due to its resistance It has excellent properties such as voltage strength and arc suppression ability, and has become the mainstream of insulating gas. However, the problem of global warming caused by sulfur hexafluoride and the greenhouse effect of the earth's atmosphere and the pollution of toxic gases synthesized by sulfur hexafluoride in case of accidents have been increasing in recent years in the awareness of environmental protection, and the use of sulfur hexafluoride has gradually become popular. limit.

On the other hand, the part that most needs to be inspected in gas-insulated combined electrical appliances is the circuit breaker. In the case of using sulfur hexafluoride as the insulating gas, the sulfur hexafluoride in the appliance needs to be recovered and refilled for each inspection. In order to supplement the lost part of sulfur hexafluoride during recovery and refilling, the problem of needing recovery and refilling treatment equipment is derived, which is very inconvenient for the maintenance of the equipment.

In the Japanese patent publication "JP-A-60-141105", a technique of using dry air instead of sulfur hexafluoride as an insulating gas is disclosed. In this technology, the dry air is compressed and stored in a pressure-resistant gas cylinder using a pressurized pump. When needed, this cylinder is provided to the gas-insulated combination device, and it is used in a non-pressurized state in the gas-insulated combination device.

However, due to the recent trend of miniaturization of gas-insulated combined electrical appliances due to the market demand, due to such a trend of miniaturization, it is necessary to have more excellent withstand voltage strength for the insulating gas in the airtight container, and to have better protection for the live components in the airtight container. Appearance and configuration planning and design to meet the technical specifications of electrical appliances.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art, to provide a shape and configuration of live components in an airtight container that can meet the requirements of the above-mentioned product technical specifications and the requirements for gas-insulated combined electrical appliances in recent years, innovative research planning and design , Research and develop an environment-friendly gas-insulated combined electrical appliance whose withstand voltage performance is equivalent to the air insulation effect of traditional sulfur hexafluoride gas-insulated combined electrical appliances.

In order to achieve the above-mentioned purpose, the environment-friendly gas-insulated combined electrical appliance of the present invention has the following structure:

The main feature of this environment-friendly gas-insulated combined electrical appliance is that the combined electrical appliance has several airtight containers filled with dry low-voltage pure air, and each airtight container contains several switches, and the airtight container and the external circuit Insulating spacers are connected between each airtight container, and the pressure of the dry low-pressure pure air is 0-0.1MPa, and the moisture content of the dry low-pressure pure air is below the dew point of -40°C.

The dry low-pressure air in the airtight container is directly filled with high-pressure pure air contained in steel cylinders.

Each of the switches includes a live part and a ground part, and no insulation barrier is set between the live part and the ground part or between each live part.

The switch is a main circuit switch or a three-position switch with isolation and grounding.

The main circuit switch is a vacuum circuit breaker.

The isolated grounding three-position switch is a box knife type contact switch.

The insulating spacers are three-phase insulating spacers, and each three-phase insulating spacer is provided with a capacitive charged display device.

The environment-friendly gas-insulated combined electrical appliance adopted in this invention meets the aforementioned requirements for product technical specifications and the requirements for gas-insulated combined electrical appliances in recent years, and innovates the research, planning and design of the shape and configuration of the live components in the airtight container, and obtains The withstand voltage performance is equal to the air insulation effect of the traditional sulfur hexafluoride gas-insulated combined electrical equipment; not only that, because the live parts of the present invention do not need to be made of epoxy resin that will cause environmental pollution The non-recyclable insulation barrier, and during electrical maintenance or repair, the pure air in the airtight container can be directly discharged, and after the repair is completed, it can be directly filled with commercially available pure air, which is safer and more convenient than ever.

Description of drawings

Fig. 1 is a structural schematic diagram of the first embodiment of the environment-friendly gas-insulated combined electrical appliance of the present invention.

Fig. 2 is a schematic structural view of the second embodiment of the environment-friendly gas-insulated combined electrical appliance of the present invention.

Detailed ways

In order to understand the technical content of the present invention more clearly, the embodiments of the environment-friendly gas-insulated combined electrical appliance for three-phase AC circuits of the present invention will be further described in detail below.

In this environment-friendly gas-insulated combined electrical appliance, the combined electrical appliance 1 has airtight containers 2 and 3 filled with dry low-voltage pure air, each airtight container contains several switches, and the switch is a main circuit switch. 31 or an isolated grounding three-position switch 22; the main circuit switch 31 is a vacuum circuit breaker 31; the isolated grounding three-position switch 22 is a box knife type contact switch 22; each of the switches includes There is no insulation barrier between the live part and the ground part and between the live part and the live parts; insulating spacers are connected between the airtight containers 2, 3 and the external lines and between each airtight container , the insulating spacer is a three-phase insulating spacer, and each three-phase insulating spacer is provided with a capacitive charging display device; the dry low-pressure pure air pressure is 0-0.1MPa, and the dry low-voltage pure air The moisture content of the air is below the dew point of -40°C, and the dry low-pressure air in the airtight container is directly filled with high-pressure pure air contained in a steel cylinder.

Embodiment one

Please refer to Fig. 1, which is a structural explanatory diagram of the first embodiment of the environment-friendly gas-insulated combined electrical appliance of the present invention, which includes an environment-friendly gas-insulated combined electrical appliance 1, an airtight container 2 in the upper section, and a high-voltage insulating support 21 , EDS three-position box knife type isolating switch 22, three-phase bus bar 23, capacitive charging display device 101 arranged on the insulating spacer 91 separating the upper and lower sections, the closed container 3 in the lower section, and the vacuum circuit breaker 31, EDS operating mechanism 4, circuit breaker operating mechanism 5, incoming and outgoing cables 6, flexible bellows 7, capacitive charging display device 104 arranged on the three-phase insulating spacer 94 connected to the external section, wherein EDS three stations The box knife type isolating switch 22 and the vacuum circuit breaker 31 respectively correspond to the positions of each phase of the three-phase busbar, and the EDS operating mechanism 4, the circuit breaker operating mechanism 5, and the incoming and outgoing cables 6 are arranged outside the upper and lower closed sections 2 and 3 ; The above-mentioned upper and lower sections 2 and 3 are filled with dry low-pressure pure air, and its rated pressure and water content are respectively above 0.03MPa (Gauge) and below the dew point of -40°C.

The EDS three-position box-knife isolating switch 22 is connected to the movable side of the vacuum circuit breaker 31 via the insulating spacer 91, and the fixed side of the vacuum circuit breaker 31 is connected to the incoming and outgoing cables 6 of the external section via the insulating spacer 94 .

Embodiment two

Please refer to Fig. 2 again, which is a structural explanatory diagram of the second embodiment of the environment-friendly gas-insulated combined electrical appliance of the present invention, which includes an environment-friendly gas-insulated combined electrical appliance 1, an airtight container 2, and a high-voltage insulating support 21, EDS three-position box-knife isolating switch 22, three-phase busbar 23, capacitive charging display device 101 arranged on the insulating spacer 91 separating the upper and lower sections, vacuum circuit breaker 31, EDS operating mechanism 4, circuit breaker Operating mechanism 5, incoming and outgoing cables 6, current comparator CT 7, flexible expansion bag 8, capacitive charging display device 104 arranged on the three-phase insulating spacer 94 connected to the external section, wherein the EDS three-position box The knife-type isolating switch 22 and the vacuum circuit breaker 31 respectively correspond to the positions of each phase of the three-phase bus, and the EDS operating mechanism 4, the circuit breaker operating mechanism 5, and the incoming and outgoing cables 6 are arranged outside the sealed section 2; The medium is filled with dry low-pressure pure air, and its rated pressure and water content are above 0.03MPa (Gauge) and below -40°C dew point respectively.

The EDS three-position box-knife isolating switch 22 is connected to the movable side of the vacuum circuit breaker 31 through the insulating spacer 91, and the fixed side of the vacuum circuit breaker 31 is first connected to the flow converter 7, and then connected to the outside through the insulating spacer 94 Interval incoming and outgoing cables 6.

When the vacuum circuit breaker 31 opens and closes the main circuit, the airtightness of the airtight container 3 in the lower section is maintained by the flexible expansion bag 8, and the circuit is turned on and off by moving the movable electrodes in the vacuum circuit breaker back and forth .

Adopt the above-mentioned technical scheme of the present invention, its effect is as follows:

(1) Fill dry low-pressure pure air as insulating gas in an airtight container containing a plurality of switchgears. The dry low-pressure pure air is different from the commonly used sulfur hexafluoride, because it is completely harmless, so it will not cause the deterioration of the global environment. In addition, using this low-pressure pure air filled with air can only buy commercially available pure air, which improves the convenience of electrical warranty and maintenance.

(2) In item (1) above, the dry low-pressure pure air pressure is 0-0.1MPa (Gauge), and the airtight container containing the switch can avoid the intrusion of external moisture, dust, etc., and the gas in the airtight container The insulation performance can be kept stable for a long time.

(3) In the above item (1), it is filled with commercially available dry low-pressure pure air with a water content below -40°C dew point, and the insulation performance will not be affected by low temperature condensation.

(4) In the above item (1), the conventional insulation barrier is not used between the charging parts, and the insulation barrier material does not need to be recycled, which is more environmentally friendly.

(5) In the above item (1), the high-current breaking of the switch combination is performed in a vacuum environment inside the vacuum circuit breaker, and there will be no toxic components produced by the combination of the high-current arc and the insulator during breaking, and the stability can be maintained. Excellent dry low voltage pure air insulation performance.

(6) In item (1) above, install capacitive charging display devices on the three-phase insulating spacers in the upper and lower sections of the interval and the three-phase insulating spacers connected to the outer section respectively. The live display results can judge whether the upper and lower intervals are abnormal, and serve as a signal for the electrical interlocking of the upper and lower intervals. This design improves the safety and reliability of the equipment.

The above-mentioned environment-friendly gas-insulated combined electrical appliances are adopted, which meet the aforementioned requirements for product technical specifications and the requirements for gas-insulated combined electrical appliances in recent years, and innovate the research, planning and design of the shape and configuration of the live components in the airtight container, and obtain durable The voltage performance is equivalent to the air insulation effect of the traditional sulfur hexafluoride gas-insulated combined electrical environment-friendly gas-insulated combined electrical equipment; not only that, because the live parts of the present invention do not need to be made of epoxy resin that will cause environmental pollution Non-recyclable insulation barrier, and during electrical maintenance or repair, the pure air in the airtight container can be directly discharged, and after the repair is completed, it can be directly filled with commercially available pure air, which is safer and more convenient than ever.

In this specification, the invention has been described with reference to specific embodiments thereof. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims (6)

1. An environment-friendly gas-insulated combined electrical appliance, characterized in that the combined electrical appliance has several airtight containers filled with dry low-voltage pure air, and several switchgears are accommodated in each airtight container, and the airtight container and Insulation spacers are connected between the external lines and between each airtight container, and the pressure of the dry low-pressure pure air is 0-0.1MPa, and the moisture content of the dry low-pressure pure air is below the dew point of -40°C. The dry low-pressure air in the closed container is directly filled with high-pressure pure air contained in a steel cylinder. 2. The environment-friendly gas-insulated combined electrical appliance according to claim 1, characterized in that each switch includes a live part and a ground part, and there is no gap between the live part and the ground part and between each live part. Set up an insulating barrier. 3. The environment-friendly gas-insulated combined electrical appliance according to claim 1, characterized in that the switch is a main circuit switch or an isolated grounding three-position switch. 4. The environment-friendly gas-insulated combined electrical appliance according to claim 3, wherein the main circuit switch is a vacuum circuit breaker. 5. The environment-friendly gas-insulated combined electrical appliance according to claim 3, wherein the three-position switch for isolation and grounding is a box-knife contact switch. 6. The environment-friendly gas-insulated combined electrical appliance according to claim 1, wherein the insulating spacers are three-phase insulating spacers, and each three-phase insulating spacer is provided with a capacitive charging display device.

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