CN203932788U - A kind of solid insulation voltage transformer cabinet - Google Patents

Abstract

The utility model discloses a solid-insulated voltage transformer cabinet, which includes a voltage transformer cabinet, a voltage transformer, an isolating switch, and an isolating switch operating mechanism arranged in the voltage transformer cabinet. There is an insulating cylinder, the isolating switch is placed in the insulating cylinder, the insulating cylinder is filled with epoxy resin, the outlet bushing of the isolating switch is connected to the voltage transformer outside the insulating cylinder through a flexible cable, and the isolating The switch operating mechanism is placed outside the insulating cylinder and connected with the isolating switch. The cabinet guarantees the quality of power supply under all-weather conditions, and the work is not affected by rainy and snowy weather, high air humidity and dirty environment.

Description

A solid insulation voltage transformer cabinet

technical field

The invention relates to a complete set of switchgear for high-voltage electrical appliances, in particular to an environment-friendly solid insulation switchgear voltage transformer cabinet (hereinafter referred to as PT cabinet).

Background technique

In the urban outdoor 10KV distribution network power supply, in order to ensure the reliability, stability and timeliness of the power supply scheme, the ring network power supply mode is often used, that is, a group of 10KV ring network cabinet stations are set up at a certain location.

Due to the functional requirements, the ring network cabinet itself has vacuum circuit breakers, load switches and other closing and opening components, which require electric mechanisms to operate, and these mechanisms require low-voltage power supplies, such as 220V and 100V, and can only be installed at each station. Transformer cabinet to achieve.

Generally speaking, the manufacturing, installation, and acceptance standards of outdoor 10KV voltage transformer cabinets adopt the air-type insulation method, as shown in Figures 1 and 2. The failure rate is high and the accident rate is high. It has always been a big problem and it is difficult to solve. Mainly manifested in the following defects:

1. The influence of temperature difference; during the use of the product, when there is a large difference in temperature, condensation will occur in the voltage transformer cabinet, that is, water droplets are attached to the surface of the parts in the cabinet, causing discharge or fault short circuit in the cabinet.

2. The influence of the rainy season; on rainy days, the air contains moisture and the air humidity is very high. Since the "leakage distance" in high-voltage electrical products has strict requirements on air humidity, when the humidity is high, there will be phase-to-phase or relative Short circuit to ground, resulting in voltage transformer cabinet failure. Especially in the rainy season, it is the most serious.

3. The influence of air dust; because the product is on the side of the road, air-insulated products are most afraid of dust particles, which will be attached to the surface of the parts, causing the phenomenon of "arc climbing" of the charged body until discharge.

4. The impact of heavy rain and urban water capacity; in southern cities, there are heavy rains every year. If the city’s water capacity is insufficient and the water on the road rises, it will flood the air-type voltage transformer cabinet, cause a short circuit in the cabinet, and even cause an electric shock accident.

Contents of the invention

The technical problem to be solved by the present invention is to realize a voltage transformer power supply device that is safe, reliable and less affected by external factors.

In order to achieve the above object, the technical solution adopted in the present invention is: a solid insulation voltage transformer cabinet, including a voltage transformer cabinet, a voltage transformer, a disconnector, and a disconnector operating mechanism arranged in the voltage transformer cabinet, the The voltage transformer cabinet is also equipped with an insulating cylinder, the isolating switch is placed in the insulating cylinder, the insulating cylinder is filled with epoxy resin, and the outlet bushing of the isolating switch is connected to the voltage outside the insulating cylinder through the flexible cable. The transformer is connected, and the operating mechanism of the isolating switch is placed outside the insulating cylinder and connected with the isolating switch.

The insulating cylinder is placed in the solid insulation isolation cabinet in the voltage transformer cabinet.

The voltage transformer is placed in the middle of the voltage transformer cabinet, 700-900mm away from the bottom of the cabinet.

The voltage transformer is externally insulated and sealed, and has a built-in 0.5A fuse.

The bottom surface of the voltage transformer cabinet is provided with a grounding bus bar, and the voltage transformer cabinet is provided with a voltmeter, which is respectively connected to the voltmeter through a 220V/110V output cable junction box.

The primary high-voltage electrified body of the voltage transformer is connected with external equipment through a cable connector and a flexible cable.

A touchable lightning arrester is arranged in the voltage transformer cabinet.

An explosion-proof plate is provided at the rear of the voltage transformer cabinet.

The advantages of the present invention include: 1. It uses a reliable epoxy material as the composite medium, which reduces the leakage distance and creepage distance of the charged body of the product. 2. All high-voltage live parts are sealed in a solid airtight chamber. Since there is no air in the air chamber, the outside air cannot enter during use, and it is not affected by air humidity and dust. 3. During operation, the 10kV high voltage of the power grid is introduced with the busbar connector to realize low voltage output and meet the needs of on-site power consumption. 4. The operable parts are placed in the isolation cabinet, which is convenient for on-site work and maintenance. All the connecting parts and transmission parts inside and outside the isolation cabinet pass through high-strength sealing rings. 5. The protection of the voltage transformer adopts XRNT current-limiting fuse, and the control of the voltage transformer is through the load switch. 6. The shell of the product is made of 304 stainless steel welded by CNC laser, with strong anti-corrosion ability, uniform magnetic field and good heat dissipation. 7. The product has a high protection level and strong anti-storm performance.

Description of drawings

The following is a brief description of the content expressed in each drawing in the description of the present invention and the marks in the figure:

Figure 1 Schematic diagram of the back of the solid insulated PT cabinet;

Figure 2 Schematic diagram of the side of the solid insulated PT cabinet;

Figure 3 Front schematic diagram of solid insulated PT cabinet;

The marks in the above figures are: 1. Voltage transformer cabinet; 2. Voltmeter; 3. Output cable junction box; 4. Cable connector; 5. Voltage transformer; 6. Flexible cable; 7. Ground bus bar; 8 , Lightning arrester; 9, Isolation switch operating mechanism; 10, Isolation cabinet; 11, Insulation cylinder; 12, Explosion-proof plate; 13, Explosion-proof plate.

Detailed ways

The invention of the voltage transformer cabinet of this application is mainly a full-working condition product designed for the existing products that are affected by the objective environment during use and cannot guarantee effective power supply. (1) It adopts a solid insulation method without any exposed electrification Body, safe and reliable, touchable. (2) Since the cabinet body does not use SF6 gas, all high-voltage live parts are sealed in an epoxy resin casting insulating cylinder 11, which is fully insulated and fully sealed. When in use, the outside air cannot enter, and it is not affected by air humidity. It is an environmentally friendly and safe PT cabinet. (3) Use the flexible cable 6 and the cable connector 4 to introduce the 10kV high voltage of the power grid during operation to achieve low voltage output and meet the needs of on-site power consumption. (4) The PT is placed in the middle of the cabinet, with a certain height (about 800mm) from the ground , strong anti-water ability, and convenient for on-site work and maintenance. (5) The protection of the voltage transformer 5 adopts a built-in XRNT current-limiting fuse, and the control of the voltage transformer 5 is through a three-position isolating switch.

Specifically, the solid insulated voltage transformer cabinet includes a voltage transformer cabinet 1, a voltage transformer 5 arranged in the voltage transformer cabinet 1, a disconnector, a disconnector operating mechanism 9, and an insulating cylinder 11.

Among them, the isolating switch is a three-position isolating switch, which is the control part for the power supply to enter and exit. It should be realized by the matching operating mechanism 9. The cable connector 4 and the flexible cable 6 play the role of connecting 10kV high-voltage electricity. The outer layer is shielded and grounded, which is safe. reliable;

The built-in voltage transformer 5 is equipped with a fuse XRNT to play a safe role. When the leakage current of the transformer 5 exceeds a certain value, the high voltage power supply of the transformer 5 is cut off; the main function of the voltage transformer 5 is to convert the voltage from high voltage to to low pressure.

Layout of voltage transformer cabinet 1 10KV high-voltage incoming line terminal is set at the top, through three-position isolating switch, cable connector 4 and flexible cable 6, primary high-voltage terminal of voltage transformer 5, built-in high-voltage current-limiting fuse, and finally by mutual inductance The low-voltage outlet terminal of the device is connected to the secondary control power supply. The outer surface of the voltage transformer cabinet 1 is sprayed with a metal grounding shielding layer; the cabinet shell is made of aluminum-zinc plate and processed by a CNC machining center with high processing accuracy. After forming and assembling, various internal components are installed;

The isolating switch is placed in the insulating cylinder 11 filled with epoxy resin, and the insulating cylinder 11 is placed in the solid insulation isolation cabinet 10 in the voltage transformer cabinet 1 . The bottom surface of the voltage transformer cabinet 1 is provided with a grounding bus bar 7, and the voltage transformer cabinet 1 is provided with a voltmeter 2, which is connected to the voltmeter 2 through a 220V/110V output cable junction box 3, and the voltage transformer cabinet 1 can be set Touch lightning arrester 8, rear portion is provided with explosion-proof plate 12,13.

This product is used together with the solid insulated ring network cabinet. It is connected to the high voltage interface on the top of the ring network cabinet through the top solid insulated busbar and can obtain 10KV high voltage power supply. The solid insulating material filled inside does not emit any toxic substances, and there is no hidden danger of gas leakage explosion and internal arcing. The fully enclosed design meets the needs of all working conditions. This invention combines the theory of solid insulation with the characteristics of touchable cable connectors and uses modern technology to solve the problem of harsh environmental pollution on the safety and reliability of power supply. The bad weather outside the product does not affect the safety of power supply. Moreover, the voltage transformer cabinet 1 is simple in structure, safe and environment-friendly, easy to repair and maintain, and can be used in all working conditions without being affected by the environment.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods, as long as various insubstantial improvements are adopted in the method concept and technical solutions of the present invention, or there is no improvement Directly applying the conception and technical solutions of the present invention to other occasions falls within the protection scope of the present invention.

Claims (8)

1. A solid insulation voltage transformer cabinet, comprising a voltage transformer cabinet (1), a voltage transformer (5), a disconnector, a disconnector operating mechanism (9) arranged in the voltage transformer cabinet (1), its It is characterized in that: the voltage transformer cabinet (1) is also provided with an insulating cylinder (11), the isolating switch is placed in the insulating cylinder (11), and the insulating cylinder (11) is filled with epoxy resin, The outlet bushing of the isolating switch is connected to the voltage transformer (5) outside the insulating cylinder (11) through a flexible cable (6), and the operating mechanism (9) of the isolating switch is placed outside the insulating cylinder (11) and connected to the Isolation switch connection. 2. The solid-insulated voltage transformer cabinet according to claim 1, characterized in that: the insulating cylinder (11) is placed in the solid-insulated isolation cabinet (10) in the voltage transformer cabinet (1). 3. The solid insulation voltage transformer cabinet according to claim 2, characterized in that: the voltage transformer (5) is placed in the middle of the voltage transformer cabinet (1), 700-900mm away from the bottom of the cabinet. 4. The solid insulation voltage transformer cabinet according to claim 1, 2 or 3, characterized in that: the voltage transformer (5) is externally insulated and sealed, and has a built-in 0.5A fuse. 5. The solid insulation voltage transformer cabinet according to claim 4, characterized in that: the bottom surface of the voltage transformer cabinet (1) is provided with a grounding bus bar (7), and the voltage transformer cabinet (1) A voltmeter (2) is arranged on it, and is respectively connected to the voltmeter (2) through a 220V/110V output cable junction box (3). 6. The solid insulated voltage transformer cabinet according to claim 5, characterized in that: the primary high-voltage electrified body of the voltage transformer (5) is connected to external equipment by a cable connector (4) and a flexible cable (6) . 7. The solid insulation voltage transformer cabinet according to claim 6, characterized in that: a touchable lightning arrester (8) is arranged in the voltage transformer cabinet (1). 8. The solid insulation voltage transformer cabinet according to claim 7, characterized in that: explosion-proof panels (12, 13) are provided at the rear of the voltage transformer cabinet (1).