CN207800341U - A kind of band busbar wall-penetrating type current transformer - Google Patents

Abstract

The utility model is related to electric system high-tension measurement and protective device, more particularly to a kind of band busbar wall-penetrating type current transformer.Including insulator and the iron core being encapsulated in insulator, secondary winding, first winding and annular capacitor bleeder mechanism, wherein iron core is loop configuration, secondary winding is wound on iron core, secondary winding and annular capacitor bleeder mechanism are set on the primary conductive bar of first winding, the secondary connection lead being connect with secondary winding and the capacitance leading-out terminal being connect with annular capacitor bleeder mechanism are drawn by insulator, and the both ends of first winding are the circle contact shape for plug.The utility model is formed using epoxide resin vacuum is casting insulated, has the characteristics that reliable, flexible for installation small, simple in structure, easy-to-connect, insulation, easy care, economy are higher.

Description

A wall-penetrating current transformer with bus bar

technical field

The utility model relates to a high-voltage measurement and protection device for an electric power system, in particular to a wall-penetrating current transformer with a busbar.

Background technique

The wall-through current transformer with busbar is a device for measuring current, electric energy or relay protection in the switch cabinet of the power system. At present, some of the wall-through busbar current transformers used in the power system use semi-closed current transformers with exposed iron cores (ie Internally enclosing the primary and secondary windings, the insulating main body, the stacked iron core, and the metal mounting plate are assembled into an overall structure by relevant clamps and bolts), which have the advantages of large volume, small creepage distance, Disadvantages such as small dynamic and thermal stable current, low measurement accuracy, easy moisture absorption, and easy electricity theft; there are also some through-the-wall current transformers without busbars (that is, the internal iron cores are all wrapped in resin, but without primary conductors) This kind of product has the disadvantages of large volume, low measurement accuracy, easy to steal electricity, and easy to discharge, and the performance of the product will decline to varying degrees with the prolongation of use time, which will become a hidden danger to the safe operation of equipment in the power system. Many of the above problems have always troubled the maintenance personnel of the power system. In addition, due to the large size of the transformer, the volume of the switch cabinet is also large, and the space occupied by the cabinet is also large, which is very unfavorable for saving resources. It is an urgent problem to be solved in the upgrading and development of type current transformers.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a wall-through current transformer with a busbar to solve the problems of large volume, small creepage distance, and small dynamic and thermal stability current transformer in the existing power system switch cabinet. , low measurement accuracy, easy to absorb moisture and other shortcomings.

In order to achieve the above object, the utility model adopts the following technical solutions:

A wall-penetrating current transformer with a busbar, comprising an insulator and an iron core encapsulated in the insulator, a secondary winding, a primary winding, and a ring-shaped capacitive voltage divider, wherein the iron core has a ring structure, and the secondary winding Wound on the iron core, the secondary winding and the annular capacitor voltage divider are set on the primary conductive rod of the primary winding, the secondary wiring lead connected to the secondary winding and the annular capacitor The capacitor output terminals connected to the voltage divider are all led out from the insulator, and the two ends of the primary winding are in the shape of pluggable round contacts.

The insulator is an L-shaped integrated structure in which the primary winding, the secondary winding, and the annular capacitor voltage divider are encapsulated by epoxy resin vacuum casting.

The bottom of the insulator is provided with a mounting insert.

The secondary connection leads are led out from the bottom of the insulator, and the ends are connected with secondary connection terminals.

The outer side of the secondary connection terminal is provided with a wiring cover.

The capacitor output terminal is disposed on the side wall of the insulator.

The incoming wire end of the primary winding is accommodated in the sealing groove provided at the end of the insulator.

The outer surface of the insulator is provided with an aluminum-sprayed layer.

The utility model has the following beneficial effects and advantages:

1. The utility model has high mechanical strength and is easy to install: the utility model adopts a three-unit installation method as a whole, which reduces the overall volume, and the insulating installation partition realizes convenient installation with the cabinet body, which further ensures the safety during use and transportation. Equipment integrity and higher mechanical strength.

2. The utility model has stable insulation and accurate capacitance output: the use of bushings increases the surface creepage distance, and the stable output of capacitance value can accurately reflect the operation of the cabinet when used in conjunction with the charged display.

3. The utility model is reliable in sealing, dust-proof and vibration-proof: when the utility model is assembled and installed, it is installed with an insulating mounting plate, which ensures the reliable dust-proof sealing of the high-voltage bus room and the operating room in the equipment, and improves the reliability of transportation during transportation. The anti-vibration performance during the process and other electrical vibrations can avoid the occurrence of vibration damage.

4. The utility model is standardized and has a high coefficient of generalization: this utility model is a product developed for the 12kV solid insulation removable switchgear using a vacuum interrupter removable circuit breaker handcart, and realizes two functions: the main circuit is closed. combined and isolated functions. The primary parts of the solid switchgear are fully sealed in epoxy, and the solid-sealed pole technology is adopted to organically combine the vacuum interrupter, main conductive circuit, insulating support, etc., to realize a fully insulated, fully sealed, maintenance-free structure , and at the same time realize the detachable and replaceable structure of the unit.

5. The utility model is made of epoxy resin vacuum casting, which has the advantages of small size, large creepage distance, high dynamic and thermal stable current, high measurement accuracy, moisture-proof, anti-condensation, and anti-electricity theft.

Description of drawings

Fig. 1 is the internal structure schematic diagram of the present utility model;

Fig. 2 is a schematic diagram of the external structure of the utility model;

Fig. 3 is the right view of Fig. 2;

Fig. 4 is a bottom view of Fig. 2 .

In the figure: 1 is the iron core, 2 is the secondary winding, 3 is the primary winding, 4 is the secondary wiring lead, 5 is the secondary wiring terminal, 6 is the capacitor output terminal, 7 is the ring capacitor voltage divider, 8 is the sealing Slot, 9 is a wiring cover, 10 is an installation insert, 11 is an aluminum spray layer, and 12 is an insulator.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-4, the utility model provides a current transformer with a bus through the wall, including an insulator 12 and an iron core 1 enclosed in the insulator 12, a secondary winding 2, a primary winding 3 and a ring capacitor The voltage dividing device 7, wherein the iron core 1 is a ring structure, the secondary winding 2 is wound on the iron core 1, the secondary winding 2 and the annular capacitor voltage dividing device 7 are both set on the primary conductive rod of the primary winding 3, and the secondary winding 2 The secondary wiring lead 4 connected to the winding 2 and the capacitor output terminal 6 connected to the ring capacitive voltage divider 7 are both led out from the insulator 12 , and both ends of the primary winding 3 are in the shape of round contacts that can be plugged and pulled out.

The insulator 12 is an L-shaped integral structure that encloses the primary winding 3, the secondary winding 2 and the annular capacitive voltage divider 7 by epoxy resin vacuum casting, and has sufficient insulation.

Furthermore, the secondary connection lead 4 is led out from the bottom of the insulator 12 , and the end is connected to the secondary connection terminal 5 , and the outside of the secondary connection terminal 5 is provided with a wiring cover 9 . The wire-in end of the primary winding 3 is accommodated in the sealing groove 8 provided at the end of the insulator 12 , and the capacitor output terminal 6 is arranged on the side wall of the insulator 12 .

A capacitor body is formed between the annular capacitive voltage divider 7 and the primary winding 3, which is output to the cabinet charging display device by means of the capacitor output terminal 6.

Further, the outer surface of the insulator 12 is provided with an aluminum-sprayed layer 11 , and the bottom of the insulator 12 is provided with an installation insert 10 .

The utility model adopts a rolled iron core and utilizes the principle of electromagnetic conversion, so that the secondary current can accurately reflect the change of the measured primary current, and transmit it to the secondary measurement and control device; the matching use of the capacitor voltage divider power supply and the charged display can accurately It reflects the operation of the cabinet and is used for current and electric energy measurement and relay protection.

The utility model is mainly used for 12kV solid insulation removable switchgear, and realizes two functions: main circuit closing and isolating functions. The primary parts of the solid switchgear are fully sealed in the epoxy casting body, and the solid-sealed pole technology is adopted to organically combine the vacuum interrupter, the main conductive circuit, and the insulating support to achieve full insulation, full sealing, and maintenance-free structure, and also realize the unit detachable structure. The intelligent user boundary switch is the main equipment in the automatic power distribution network of the urban network. It is installed at the boundary between the distribution line and the user. It can isolate the faults in the user area and prevent the fault from spreading to the outdoor high-voltage switch on the system line. , and ultimately improve the reliability and quality of power supply. The utility model is made of epoxy resin vacuum pouring insulation, and has the characteristics of small size, simple structure, large creepage distance, convenient wiring, reliable insulation, flexible installation, easy maintenance and high economy.

The above descriptions are only the embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. All modifications, equivalent replacements, improvements, extensions, etc. made within the spirit and principles of the present utility model are included in the protection scope of the present utility model.

Claims (8)

1. a wall-through current transformer with busbar is characterized in that it comprises an insulator (12) and an iron core (1), a secondary winding (2), and a primary winding ( 3) and an annular capacitive voltage divider (7), wherein the iron core (1) is an annular structure, the secondary winding (2) is wound on the iron core (1), and the secondary winding (2) and The annular capacitor voltage divider (7) is all set on the primary conductive rod of the primary winding (3), and the secondary wiring lead (4) connected to the secondary winding (2) and the voltage divider with the annular capacitor The capacitor output terminals (6) connected to the device (7) are all led out from the insulator (12), and the two ends of the primary winding (3) are in the shape of round contacts that can be plugged in and out. 2. The wall-penetrating current transformer with busbar according to claim 1, characterized in that, the insulator (12) is vacuum casted with epoxy resin to form a primary winding (3), a secondary winding (2) and an annular The capacitive voltage divider (7) is enclosed in an L-shaped integrated structure inside. 3. The through-wall current transformer with busbar according to claim 2, characterized in that, the bottom of the insulator (12) is provided with an installation insert (10). 4. The wall-penetrating current transformer with busbar according to claim 2, characterized in that, the secondary wiring leads (4) are led out from the bottom of the insulator (12), and the ends are connected with secondary wiring terminal (5). 5. The through-wall current transformer with bus bar according to claim 4, characterized in that, a wiring cover (9) is provided outside the secondary terminal (5). 6. The through-wall current transformer with bus bar according to claim 2, characterized in that, the capacitance output terminal (6) is arranged on the side wall of the insulator (12). 7. The wall-penetrating current transformer with busbar according to claim 2, characterized in that, the incoming wire end of the primary winding (3) is accommodated in a sealing groove ( 8) inside. 8. The through-wall current transformer with busbars according to claim 1, characterized in that, the outer surface of the insulator (12) is provided with an aluminum-sprayed layer (11).