CN2586238Y - Dry type high voltage shunt capacitor - Google Patents

Abstract

The utility model provides a dry-type high-voltage parallel capacitor, which includes a case, a capacitor element packaged in the case and connected to the case, and an outlet terminal on the case. The outside of the box shell is provided with an epoxy resin insulator protective layer. The capacitor element is a self-healing metallized capacitor element. It has the characteristics of good insulation, safety and reliability, high rated voltage of a single capacitor, simple structure, and convenient installation and use.

Description

Dry type high voltage shunt capacitor

technical field

The utility model belongs to electrical components, and is mainly used in a power system to improve power factor of a power grid and reduce consumption, specifically a dry-type high-voltage shunt capacitor.

Background technique

Due to the high working field strength of the internal medium, high-voltage shunt capacitors are almost all oil-immersed structures in the past. With the improvement of oil-free requirements in substations, except for capacitors in substations of 35kV and below, other electrical equipment has been oil-free. Therefore, how to effectively and economically solve the problem of oil-free high-voltage capacitors becomes very important. important.

At present, the existing dry capacitor technology in China uses low-voltage metallized self-healing capacitor elements to be packaged in the case, and the interior is filled with solid fireproof materials. When in use, multiple capacitors are mounted on an insulating stand, from Externally connect capacitors in series to form a high-voltage capacitor. This structure has two disadvantages. One is that the capacitor is a semi-insulating structure, that is, the ground insulation of the capacitor must be borne by an additional high-voltage post insulator, which causes complicated wiring and requires a large installation space; second, the protection is not reliable enough. Its protection method is only to reduce the loss of faults through fireproof materials, and cannot isolate a single faulty component sensitively. Therefore, the existing dry-type capacitor technology generally has high cost and insufficient reliability, which is also the main reason why the current dry-type capacitor cannot be fully promoted.

Contents of the invention

The purpose of this utility model is to overcome the disadvantages of the existing dry-type capacitor that the rated voltage of a single capacitor is too low, it is necessary to use multiple capacitors in series on an insulating stand to form a high-voltage capacitor and the shortcomings of unreliable protection, and provide a dry-type high-voltage parallel The capacitor has the characteristics of good insulation, safety and reliability, high rated voltage of a single capacitor, simple structure, and convenient installation and use.

The purpose of this utility model is achieved through the following technical solutions: a dry-type high-voltage parallel capacitor, including a case, a capacitor element packaged in the case connected to the case, and an outlet terminal on the case, which is characterized in that it is packaged in the case The capacitor elements are connected in series and parallel, and the outside of the box shell is provided with an epoxy resin insulator protective layer.

The capacitor element is a self-healing metallized capacitor element with pressure fault protection.

The inside of the box shell is divided into at least two insulated and spaced chambers, and all capacitor elements connected in series and parallel are respectively placed in the corresponding chambers.

Compared with the prior art, the utility model has many advantages and positive effects:

1. The capacitor element mainly used in the dry-type high-voltage parallel capacitor of the present invention is an element with an internal pressure fault protection function composed of a self-healing metallized capacitor element. It puts the self-healing metallized capacitor element into a sealed metal container. When the internal element fails, the gas pressure generated by the fault deforms the top cover of the metal container outward, and further melts the inner fuse connected in series with the connecting wire. The wire breaks to isolate the faulty component.

2. The built-in box shell adopted by the utility model can play a shielding role between the internal components and the ground, eliminating the partial discharge hazard between the components and the ground potential; at the same time, a reliable space is provided inside the box shell, so that the internal When a component fails, the faulty component can be deformed to achieve electrical isolation.

3. Epoxy resin is used as the insulator outside the entire box shell of the utility model, so that the capacitor element and the ground directly meet the high voltage requirement, that is, the product of the invention is a fully insulating structure, which can be directly installed on the ground without an insulating stand. In this way, a single capacitor is no different from the oil-immersed capacitors currently used in large quantities from the installation method to the wiring, and it is very convenient to use. At the same time, the epoxy resin insulator protective layer also solves the problem that iron shell products are easy to rust.

4. The implementation of the utility model will greatly improve the reliability, but the cost is not higher than that of the existing dry-type high-voltage capacitor.

Description of drawings

Fig. 1 is the top view of dry-type high-voltage shunt capacitor of the present utility model;

Fig. 2 is a sectional view along the line A-A of Fig. 1 .

Detailed ways

Below we describe the utility model in further detail in conjunction with the accompanying drawings.

Referring to Fig. 1 and Fig. 2, it is a dry-type high-voltage shunt capacitor of the present invention. The box shell 3 is a metal rectangular built-in box shell. The box shell 3 is divided into two insulated and spaced chambers. A number of self-healing metallized capacitor elements 4 with pressure fault protection in the two chambers are connected in series and parallel. All The self-healing metallized capacitor element 4 with pressure fault protection is enclosed in the box shell 3, and the epoxy resin insulator protective layer 2 outside the box shell 3 can be formed by casting. Two outlet terminals 1 are arranged on the top surface of the case 3 , and the two outlet terminals 1 are respectively connected to the corresponding self-healing metallized capacitor elements 4 in the two chambers of the case 3 .

Claims (3)

1, a kind of dry-type high-voltage shunt capacitor; comprise the case shell, be encapsulated in the capacitor element that links to each other in the case shell, the outlet terminal on the case shell; the capacitor element that it is characterized in that being encapsulated in the case shell is that connection in series-parallel connects, and described case shell outside is provided with the epoxyresin insulator protective layer.

2, dry-type high-voltage shunt capacitor according to claim 1 is characterized in that the self-healing metallized capacitor element of described capacitor element for the protection of band pressure fault.

3, dry-type high-voltage shunt capacitor according to claim 1 and 2 is characterized in that being divided at least in the described case shell chamber of two insulation gaps, and the capacitor element that all connection in series-parallel connect places corresponding cavity indoor respectively.

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