CN201854016U

CN201854016U - Power capacitor device

Info

Publication number: CN201854016U
Application number: CN2010205760785U
Authority: CN
Inventors: 丁建永; 孙红梅
Original assignee: EVERCONTAINING ELECTRIC Co Ltd
Current assignee: Qingdao Hengshun Zhongsheng Electric Manufacturing Co.,Ltd.; Qingdao Hengshun Zhongsheng Group Co ltd
Priority date: 2010-10-17
Filing date: 2010-10-17
Publication date: 2011-06-01
Anticipated expiration: 2020-10-17

Abstract

The utility model provides a power capacitor device comprising a plurality of capacitor banks which are arranged in a phase splitting way, and three-sleeve discharge coils. The power capacitor device is characterized in that the capacitor bank in each phase adopts differential protection by two phase voltage, each capacitor bank in each phase is divided into four serial-connection sections, every two serial-connection sections form a longitudinal differences, two longitudinal differences are connected between a power supply incoming line end and a neutral point in series and are respectively connected with primary sides of two three-sleeve discharge coils according to the phase voltage differential protection, and secondary sides of the three-sleeve discharge coils are connected with the differential pressure output. The differential pressure output of the capacitor bank is close to zero under the normal state, the differential pressure output presents a certain value when the capacitor bank has a fault, therefore, an executive circuit cuts off the capacitor device, and then the capacitor device is separated from a power grid; and with the adoption of the two-phase voltage differential protection, a fault section of a fault phase, in which a fault occurs, can be rapidly found out.

Description

A kind of electric capacitor apparatus

Technical field

The utility model belongs to high voltage electrical apparatus technical field, relates to a kind of electric capacitor apparatus of differential voltage protection, is a kind of electric capacitor apparatus of two-phase differential voltage protection specifically.

Background technology

The 35kV high-voltage parallel capacitor device adopts the differential voltage protection usually in 220kV transformer station, the 330kV transformer station; make high-voltage parallel capacitor device when breaking down, protective device can in time move, and high-voltage parallel capacitor device is excised; make it to break away from electrical network, avoid the fault extension.

Protected mode commonly used is single star voltage differential protection; its elementary diagram such as Fig. 3; C1, C2, C3, C4 are respectively the capacitor groups; discharge coil FD has three taps; be connected with head end L, middle O, neutral point N respectively; secondary coil is pressed the potential difference martingale, and when the normal operation of device, Δ U goes to zero.When device emerged in operation fault; be that partition capacitance device unit damages (or unit inner member fault) and can cause LO no longer to equate with capacitive reactance size between the ON; the voltage that makes LO and ON section get no longer equates; Δ U is rendered as certain value; Δ U is connected to the protection executive circuit; executive circuit excises high-voltage parallel capacitor device, makes it to break away from electrical network.

Along with the continuous development of power grid construction, the high-voltage parallel capacitor device capacity that disposes in 220kV, the 330kV transformer station is increasing, and some new problems have in use appearred in single star voltage differential protection:

The first, because the design feature of phase voltage differential protection when breaking down, needs to put in order the phase capacitor unit and all detects, could determine position, quantity and the fault degree of trouble unit.Along with capacity of capacitor bank increases, its internal capacitor separate unit quantity is also more and more, and the workload of this work is also increasing.

Second; in the capacitor group that adopts single star voltage differential protection; increase along with capacity of capacitor bank; single-phase electricity container group capacitor quantity in parallel is more and more; the change in voltage that causes after the excision of single capacitor inner member is more and more littler, like this, because the existence of initial unbalance; it is more and more difficult to cause the protection of capacitor group to be adjusted, even situation about can't adjust occurs.

How seeking a kind of new high-voltage parallel capacitor device protected mode and solve above-mentioned two problems, is the technical problem that the present technique field needs to be resolved hurrily.

Summary of the invention

The utility model is the problem that exists at prior art, and a kind of electric capacitor apparatus is provided, malfunction elimination workload in the time of effectively reducing plant failure, and significantly improve the reliability of protection.

The purpose of this utility model is achieved through the following technical solutions:

A kind of electric capacitor apparatus; comprise capacitor group and three sleeve pipe discharge coils that phase-splitting is arranged; it is characterized in that: every phase capacitor group is with two phase voltage differential protections; be that every phase capacitor component becomes four series block or series block group; per two series block or one of series block group formation are vertical poor; two vertical difference are not connected according to the phase voltage differential protection with the primary side of 2 three sleeve pipe discharge coils, and the secondary side of three sleeve pipe discharge coils is connected into differential pressure output.

To improvement of the technical scheme: described two vertical differences are connected between power inleting terminal L and the neutral point N.

To further improvement in the technical proposal: the capacitors of described two vertical differences are arranged on the 2 cover steel stands, and 2 cover steel stands are separately fixed on the 2 cover pedestal column insulators, and 2 discharge coils split the outside at 2 cover steel stands.

To further improvement in the technical proposal: be provided with the bus post insulator on the described steel stand.

Advantage of the present utility model and good effect are:

1, connection type of the present utility model has been divided into two identical parts with the protection of single-phase electricity container group; when capacitor device protection action; can from failure logging, find out which faulty section that fault appears at the fault phase rapidly; its follow-up workload of searching the CCS casual clearing station capacitor has reduced half than " protection of single-phase electricity pressure reduction ", has reduced the malfunction elimination time.

2, the utility model allows under the constant situation of overvoltage at holding element; by one of capacitor group is divided into two mutually; change two phase voltage difference protection wiring into by an original phase voltage difference protection wiring; by reducing the series connection hop count of phase voltage difference protection range inner capacitor; make the protection setting value significantly improve, thereby the reliability of phase voltage difference protection is significantly improved.

Description of drawings

Fig. 1 is the single-phase elementary diagram of the electric capacitor apparatus of the utility model two-phase differential voltage protection;

Fig. 2 is the single-phase mounting structure figure of the electric capacitor apparatus of the utility model two-phase differential voltage protection;

Fig. 3 is the single-phase elementary diagram of capacitor group of the single phase voltage difference protection of available technology adopting.

Embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail.

Referring to Fig. 1, the embodiment of the electric capacitor apparatus of a kind of two-phase differential voltage protection of the utility model comprises a plurality of capacitor group C1, C2, C3, C4 and three sleeve pipe discharge coil FD that phase-splitting is arranged ₁, FD ₂Every phase capacitor group is with two phase voltage differential protections; be that every phase capacitor component becomes four series block or series block group (serial number is 4 integral multiple); per two series block or one of series block group formation are vertical poor; C1, C2, C3, C4 respectively represent a series block among Fig. 1, C1, C2 group form one vertical poor, C3, C4 group form another indulge poor; two vertical difference are not connected FD according to the phase voltage differential protection with the primary side of 2 three sleeve pipe discharge coil FD1, FD2 ₁Connect C1, C2, FD ₂Connect C3, C4, the secondary side of three sleeve pipe discharge coils is connected into differential pressure Δ U ₁, Δ U ₂Output.

Shown in Figure 2 is the structure chart of the phase capacitor group in the TBB35-30024/417-ACW type capacitor device, and capacitor adopts inner fuse capacitor in the present embodiment.

This phase capacitor component is that two pylons are arranged, i.e. Qian Ta and Hou Ta arrange the capacitor group of two series block on every tower, be used to constitute one vertical poor, respectively be furnished with two layer capacitor groups on two towers, every layer capacitor group is lain on one's side on steel stand 4.The last layer capacitor group of preceding tower constitutes capacitor group C1, and the following layer capacitor group of preceding tower constitutes capacitor group C2; The following layer capacitor group of back tower constitutes capacitor group C3, and the last layer capacitor group of back tower constitutes capacitor group C4.Capacitor unit in each capacitor group connects with connecting lead 2, and two layer capacitor groups connect with bus 1, and the steel stand is separately fixed on the two cover pedestal column insulators 3, and for making things convenient for cabling, the relevant position on the steel stand 4 is provided with bus post insulator 5.

Before cat head layer left side is electric power incoming line L, be cascaded by capacitor group C2 in parallel after the last layer capacitor group C1 parallel connection with lower floor, again by with discharge coil FD ₁Parallel connection constitute one vertical poor.Before under the tower layer capacitor group C2 outlet backward tower extend, constitute the inlet wire of layer capacitor group C3 under the tower of back, be in series with last layer capacitor group C4 in parallel after the capacitor group C3 parallel connection, again by with discharge coil FD ₂Parallel connection to constitute another one vertical poor.Discharge coil FD ₁, FD ₂Be arranged in the outside of each tower.

The capacitor group under normal condition, Δ U ₁, Δ U ₂Value go to zero.When capacitor group emerged in operation fault, i.e. partition capacitance device unit damage (or unit inner member fault) can cause LP ₁With P ₁O (or OP ₂With P ₂N) the capacitive reactance size between is no longer equal, makes LP ₁With P ₁O (or OP ₂With P ₂N) section voltage of getting is no longer equal, Δ U ₁Or Δ U ₂Be rendered as certain value, Δ U ₁, Δ U ₂Be connected to the protection executive circuit, executive circuit excises high-voltage parallel capacitor device, makes it to break away from electrical network, owing to adopted the protection of two-phase differential voltage, and can be easily according to Δ U ₁, Δ U ₂Find out which faulty section that fault appears at the fault phase rapidly.

Certainly, above-mentioned explanation is not to be to restriction of the present utility model, and the utility model also is not limited to above-mentioned giving an example; those skilled in the art; in essential scope of the present utility model, the variation of having done, remodeling, interpolation or replacement also should belong to protection range of the present utility model.

Claims

1. electric capacitor apparatus; comprise capacitor group and three sleeve pipe discharge coils that phase-splitting is arranged; it is characterized in that: every phase capacitor group is with two phase voltage differential protections; be that every phase capacitor component becomes four series block or string section group; per two series block or one of string section group formation are vertical poor; two vertical difference are not connected according to the phase voltage differential protection with the primary side of 2 three sleeve pipe discharge coils, and the secondary side of three sleeve pipe discharge coils is connected into differential pressure output.

2. according to the described electric capacitor apparatus of claim 1, it is characterized in that described two vertical differences are connected between power inleting terminal L and the neutral point N.

3. according to claim 1 or 2 described electric capacitor apparatuses, the capacitor that it is characterized in that described two vertical differences is arranged on the 2 cover steel stands, 2 cover steel stands are separately fixed on the 2 cover pedestal column insulators, and 2 discharge coils split the outside at 2 cover steel stands.

4. according to the described electric capacitor apparatus of claim 3, it is characterized in that: be provided with the bus post insulator on the described steel stand.