CN102693840A

CN102693840A - Chain capacitor

Info

Publication number: CN102693840A
Application number: CN2012101732667A
Authority: CN
Inventors: 杨峰; 姚海明; 蔡强; 胥卫; 周丽萍; 张辉
Original assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Current assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Priority date: 2012-05-30
Filing date: 2012-05-30
Publication date: 2012-09-26

Abstract

The invention relates to a chain capacitor, which is formed by a plurality of capacitors that are sequentially connected in series and wound along the axial direction of an input high voltage electrode from inside to outside, wherein the polar plate of the first capacitor on the inner layer is wound on the cylindrical input high voltage electrode and connected with the input high voltage electrode; an insulating medium is wound on the periphery of the polar plate of the first capacitor; the polar plate of the capacitor on the second layer is wound on the insulating medium on the periphery of the polar plate of the first capacitor; an insulating medium is wound on the periphery of the polar plate of the second capacitor; and a plurality of capacitors are wound and encapsulated by epoxy resin to form the chain capacitor. The capacitor formed by adopting a plurality of coaxially-wound capacitors has the advantages of simple structure, small size, low manufacturing cost and high reliability, and is applicable to the voltage measurement and relay protection and use in the digital substation.

Description

The chain type capacitor

Technical field

The present invention relates to a kind of chain type capacitor.

Background technology

Traditional capacitor low-pressure side electric capacity directly with the direct series coupled of on high-tension side electric capacity, the centre has no electrical isolation, is subject to Influence of Temperature, stability, reliability are not high, exist bigger potential safety hazard.When short circuit or open circuit fault occurring in the high-pressure side; The suitable path of energy neither one that is stored in the electric capacity supplies its rapid release; Common " the electric charge capture phenomenon " of indication just; The electric charge that gathers on the equivalent ground capacity of dividing potential drop electric capacity can not discharge when reclosing fully; Error component of stack has influence on the correctness of measurement result and the correct operation of protective relaying device on system works voltage, and long-term work time equivalence ground capacity also can Yin Wendu etc. factor influence and become stable inadequately.

Summary of the invention

It is not enough to the objective of the invention is to overcome grade of the prior art, and provides a kind of simple in structure, the novel coiling chain type capacitor that reliability is high.

The technical scheme that the present invention adopts is: a kind of chain type capacitor; It is characterized in that: said capacitor is composed in series by a plurality of electric capacity successively; A plurality of electric capacity are reeled along input high-field electrode axial direction from inside to outside; The pole plate of first electric capacity of internal layer is wound on the cylindric input high-field electrode and links to each other with the input high-field electrode, the peripheral coiling dielectric of first capacitor plate, the pole plate of second layer electric capacity on reeling on the peripheral dielectric of first capacitor plate; The peripheral coiling dielectric of second capacitor plate, a plurality of electric capacity form a chain type capacitor by above-mentioned coiling by epoxy encapsulation.

The pole plate radial centre lines of said many electric capacity is in same horizontal plane, and the pole plate height of many electric capacity is axially from inside to outside and successively decreases the capacitance equal and opposite in direction of every electric capacity successively.

Said dielectric is a composite polyester film.

Capacitor plate of outermost layer is drawn as earth potential in said a plurality of electric capacity.

Compared with prior art, the present invention has the following advantages: electric capacity adopts winding-structure, and manufacture craft is simple, compact conformation, and volume is little, and is in light weight, and cost is low, and oneself power consumption is less, and power savings is remarkable, adapts to national energy-saving and emission-reduction, environmental protection requirement; Adopt epoxy encapsulation simultaneously, increased the ability of the response environment variation of equipment; Capacitor does not have oiling, does not have the organization plan of gasification, and the insulation of equipment, structural strength are high, no leakage of oil, disappointing potential safety hazard, reliability height; At resistance of arbitrary electric capacity parallel connection; When making circuit short circuit or open circuit fault occur; The energy that is stored in the dividing potential drop electric capacity can come rapid release through this resistance; Thereby realized the quick response tracking of the change in voltage on the transmission line is measured, thoroughly solved " electric charge capture phenomenon ", further improved the precision and the reliability of voltage transformer.

The present invention adopts a plurality of capacitance series of coaxial coiling to become capacitor, have simple in structure, volume is little, low cost of manufacture, the reliability advantages of higher is applicable in the digital transformer substation that voltage measurement and relaying protection use.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is an A place partial enlarged drawing among Fig. 1.

Among the figure: input high-field electrode 1, capacitor 2, electric capacity 3, resistance 4.

Embodiment

Below in conjunction with accompanying drawing the present invention is described further.

Shown in Fig. 1-2, a kind of chain type capacitor comprises input high-field electrode 1, capacitor 2, electric capacity 3, resistance 4.1 input of input high-field electrode connects capacitor 2, and capacitor 2 is composed in series by a plurality of electric capacity 3 successively, and resistance 4 is parallel to arbitrary electric capacity; A plurality of electric capacity 3 are reeled along input high-field electrode 1 axial direction from inside to outside; The pole plate of first electric capacity of internal layer is wound on the cylindric input high-field electrode and links to each other with the input high-field electrode, the peripheral coiling dielectric of first capacitor plate, the pole plate of second layer electric capacity on reeling on the peripheral dielectric of first capacitor plate; The peripheral coiling dielectric of second capacitor plate; Dielectric is a composite polyester film, and a plurality of electric capacity form a chain type capacitor 2 by behind the above-mentioned coiling by epoxy encapsulation, and the pole plate radial centre lines of many electric capacity 3 is in same horizontal plane; The pole plate height of many electric capacity is axially from inside to outside and successively decreases successively; The capacitance equal and opposite in direction of every electric capacity, capacitor plate of outermost layer is drawn as earth potential in a plurality of electric capacity, and the pole plate of outer field penult electric capacity connects outside after the resistance parallel connection.

Claims

1. chain type capacitor; It is characterized in that: said capacitor is composed in series by a plurality of electric capacity successively; A plurality of electric capacity are reeled along input high-field electrode axial direction from inside to outside; The pole plate of first electric capacity of internal layer is wound on the cylindric input high-field electrode and links to each other with the input high-field electrode, the peripheral coiling dielectric of first capacitor plate, the pole plate of second layer electric capacity on reeling on the peripheral dielectric of first capacitor plate; The peripheral coiling dielectric of second capacitor plate, a plurality of electric capacity form a chain type capacitor by above-mentioned coiling by epoxy encapsulation.

2. chain type capacitor according to claim 1 is characterized in that: the pole plate radial centre lines of said many electric capacity is in same horizontal plane, and the pole plate height of many electric capacity is axially from inside to outside and successively decreases the capacitance equal and opposite in direction of every electric capacity successively.

3. chain type capacitor according to claim 1 is characterized in that: said dielectric is a composite polyester film.

4. chain type capacitor according to claim 1 and 2 is characterized in that: capacitor plate of outermost layer is drawn as earth potential in said a plurality of electric capacity.