CN102403115A - Outdoor box-type 10-20kV current transformer - Google Patents

Abstract

The invention is an outdoor box-type 10-20kV current transformer, which includes a high-voltage insulating bushing, a metal box body, a current transformer body, a secondary winding outlet terminal board of the current transformer, and a channel steel; the high-voltage insulating bushing The upper end surface of the metal box is connected to the second terminal of the outlet of the primary winding of the current transformer. A certain space distance is maintained between the body of the current transformer and the metal box, and the terminal board for the outlet of the secondary winding of the current transformer is installed. Outside the lower end of one side of the metal box, the current transformer body and the metal box are installed on the channel steel; the outdoor box-type 10-20kV current transformer is developed according to the actual needs of the distribution network site. Converter appliances for power grid protection, detection, and electric energy metering can prevent oil-immersed current transformers from leaking oil and epoxy resin cast current transformers from aging and cracking defects in the wind and sun; its application can improve the power distribution network. The safe operation of the system improves the reliability of power supply, reduces the damage of current transformers, improves the power supply, and increases the benefits of enterprises and society.

Description

Outdoor box type 10~20kV current transformer

technical field

The invention relates to an outdoor box-type 10-20kV current transformer, which is a converter appliance applied to power supply protection, detection and electric energy measurement of distribution network.

Background technique

At present, with the rapid development of industrial and agricultural production, the rapid improvement of the national economy, the continuous improvement of people's living standards, the unprecedented development of the power industry, and the rapid development of the national power grid construction. The power of the grid is transformed and sent to thousands of households through the distribution network and distribution transformers. The current transformers used in the current distribution network and distribution transformer system protection, detection, and high-voltage current signal acquisition for energy measurement are oil-immersed. type, epoxy resin casting type; the disadvantage of oil-immersed current transformer is that it is easy to leak oil, the insulation is difficult to guarantee, and it often breaks down; the disadvantage of epoxy resin casting type current transformer is that epoxy resin is easy to be exposed to wind and sun. Aging and cracking, causing power outages. If the outdoor box-type current transformer is used, the above defects can be avoided.

Contents of the invention

The invention provides an outdoor box-type 10-20kV current transformer, which can avoid the oil leakage failure of the oil-immersed current transformer, and the aging, cracking and power failure accidents of the epoxy resin cast current transformer due to wind, sun, aging, and power failure.

Outdoor box-type 10-20kV current transformer, including high-voltage insulating bushing, metal box, current transformer body, current transformer secondary winding outlet terminal board, and current transformer installation channel steel; the high-voltage insulating bushing passes through The metal box is connected to two ends of the outgoing line of the primary winding of the current transformer, a certain space distance is maintained between the body of the current transformer and the metal box, and the terminal board for the outgoing line of the secondary winding of the current transformer is installed on On the outside of the lower end of one side of the metal box, a rainproof cover is installed on the top of the outlet terminal board, and the current transformer body and the metal box are installed on the channel steel.

The metal box is in a three-dimensional shape, six sides are metal, and there are two holes on it for installing high-voltage insulating bushings. The current transformer body is installed in the metal box, and the metal box is installed on the channel steel. The outer side of the lower end of one side of the metal box body is installed with the secondary winding outlet wiring board of the current transformer.

The current transformer body includes an iron core, a primary winding, a secondary winding, and epoxy resin; the iron core is O-shaped, the primary winding is placed on one side of the iron core O-shaped, and the secondary winding is placed on the iron core. The other side of the core is O-shaped; the epoxy resin is used to cast the transformer body, and the overall casting package is tightly glued; the two ends of the primary winding are connected in series in the high-voltage one-phase line; the two ends of the secondary winding are connected Control, protection, electric energy metering circuit.

The outdoor box-type 10-20kV current transformer is developed according to the actual needs of the site as a converter for distribution network protection, detection, and electric energy measurement. Compared with the prior art, the present invention has outstanding substantive features and significant Progressive, specifically, the outdoor box-type current transformer has a reasonable design and ideally realizes the distribution network protection, detection, and electric energy metering converter appliances, which will play a positive role in guaranteeing the safe operation of the power grid. The outdoor The specific advantages of box-type 10-20kV current transformers:

The invention provides an outdoor box-type 10kV current transformer, which can avoid the oil leakage failure of the oil-immersed current transformer and the aging and cracking defects of the epoxy resin cast current transformer due to wind, sun, and sun exposure.

The application of outdoor box-type 10-20kV current transformer can reduce accidents in distribution network and distribution transformer system, increase power supply, and increase enterprise and social benefits.

The application of outdoor box-type 10-20kV current transformers can improve the safe operation of the distribution network system, improve the reliability of power supply, reduce the damage of current transformers, and reduce the investment in distribution network system equipment.

Description of drawings

Fig. 1 is the structural representation of outdoor box type 10～20kV current transformer of the present invention;

Fig. 2 is a structural schematic diagram of a metal box of the present invention;

Fig. 3 is a composition diagram of the current transformer body of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Fig. 1 is the structural schematic diagram of outdoor box-type 10～20kV current transformer of the present invention, comprises high-voltage insulating bushing 1, metal box body 2, current transformer body 3, current transformer secondary winding outlet wiring board 4, current transformer installation Channel steel 5; the upper end surface of the high-voltage insulating bushing string passes through the metal box and is connected to the two terminals of the primary winding outlet of the current transformer, and a certain space is kept between the current transformer body and the metal box distance, the outlet wiring board of the secondary winding of the current transformer is installed on the outer side of the lower end of one side of the metal box, the upper end of the outlet wiring board is equipped with a rainproof cover, and the current transformer body and the metal box are installed on the channel steel superior. The current transformer body is installed in a metal box and fixed on the installation channel steel (to prevent the current transformer from being exposed to wind and sun). A certain space distance is kept between the current transformer body and the metal box. For heat dissipation and ventilation, the outdoor box Type 10kV current transformer upper end two high-voltage insulating bushing outlets are connected in series with high-voltage one phase, and the secondary winding outlet of the current transformer is connected to protection, detection, and electric energy metering devices.

Fig. 2 is the structural representation of the metal box body of the present invention, and described metal box body is three-dimensional shape, and six sides are metal plates 2, and two holes 21 are arranged on the upper end face; For installing high-voltage insulating bushing, current transformer is installed in the metal box body The body, the metal box body is installed on the channel steel 5, the outer side of the lower end of one side of the metal box body is installed the current transformer secondary winding outgoing line terminal board 4, and the top of the outgoing line terminal board is equipped with a rain cover. The metal box is used to protect the current transformer from wind and sun.

Fig. 3 is a composition diagram of the current transformer body of the present invention. The current transformer body includes an iron core 32, a primary winding 31, a secondary winding 33, and epoxy resin 34; the iron core is O-shaped, and the primary winding Covered on one side of the O-shaped iron core, the secondary winding is sleeved on the other side of the O-shaped iron core; the epoxy resin is used to cast the transformer body, cast as a whole, tightly wrapped and glued, the purpose is to keep the transformer body moisture-proof Well insulated. The two terminals L1 and L2 of the primary winding are connected in series in the high-voltage one-phase line; the two terminals K1 and K2 of the secondary winding are connected to protection, detection and electric energy metering circuits.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications to the specific implementation of the invention or equivalent replacement of some technical features; without departing from the spirit of the technical solution of the present invention, should be included in the scope of the technical solution claimed in the present invention.

Claims (3)

1. outdoor box 10～20kV current transformer is characterized in that: comprise high-tension insulating bushing, metal cabinet, current transformer body, secondary winding in current transformer outlet terminal block, current transformer installation channel-section steel; Said high-tension insulating bushing string is crossed winding outlet two terminations in said metal cabinet upper surface and said current transformer and is connected; Keep the certain space distance between said current transformer body and the said metal cabinet; Said secondary winding in current transformer outlet terminal block is installed in said metal cabinet one side lower outside; Said outlet terminal block upper end dress rain cover, said current transformer body and said metal cabinet are installed on the channel-section steel.

2. the described outdoor box 10～20kV of claim 1 current transformer; It is characterized in that: said metal cabinet is a three-dimensional shape, and six faces are metallic plates, and two holes are arranged above; Be used to install high-tension insulating bushing; Said current transformer body is installed in the said metal cabinet, and metal cabinet is installed on the channel-section steel, and metal cabinet one side lower outside is installed said secondary winding in current transformer outlet terminal block.

3. the described outdoor box 10～20kV of claim 1 current transformer, it is characterized in that: said current transformer body comprises iron core, a winding, secondary winding, epoxy resin; Said iron core is the O font, and a said winding is enclosed within iron core O font on one side, and said secondary winding is enclosed within iron core O font another side; Said epoxy resin is to be used for the casting transformer body, and integrated poured Bao Yan cements; A said winding two ends is connected in high pressure one phase line; Said secondary winding two ends joint detection, protection, ic for energy metering.

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