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A

Circuit Breaker

Control and selection of the circuit breaker

Circuit breaker control mode selection and control mode of substation, the size

of

the

substation

and

other

factors.

Substation

control

mode

is

different,

different

size, circuit breaker control mode also vary accordingly.

According to the

working

voltage

of

control

circuit, the

circuit

breaker

control

mode

can

be

divided

into

two

kinds

of,

heavy

current

and

weak

current

control.

According

to

the

operation

mode,

can

be

divided

into

one

control

two

kinds

of

control and line selection.

So-called high voltage control, is from the control equipment of commands to

the circuit breaker operating mechanism, the working voltage of the control circuit

for

dc

110

v

or

220

v.

According

to

the

control

site,

divided

into

two

kinds

of

centralized

control

and

local

control;

According

to

the

jump,

switching

circuit

monitoring,

divided

into

two

kinds

of

lighting

monitoring

and

audio

surveillance;

According

to

the

connection

of

control

circuit

is

divided

into

control

switch

has

a

fixed

position

is

not

corresponding

to

the

connection

with

control

switch

contact

automatic reset.

Weak current control can be divided into the following two cases.

(1)

the

working

voltage

of

circuit

breaker

control

circuit

into

two

parts,

low

voltage

and

heavy

current

issue

commands

control

equipment

is

working

voltage

weak current is usually 48 v. Command is issued, and then through the middle and

weak electricity conversion link weak current signal conversion to high voltage signal,

command, to the circuit breaker operating mechanism. Intermediate conversion links

between circuit breaker and at the same structure and high voltage control circuit.

This

weak

current

control,

is

essentially

the

layout

on

the

control

panel

of

weak

electrochemical control equipment.

(2)

from

the

control

equipment

to

the

working

voltage

of

circuit

breaker

operating

mechanism

of

all

circuits

are

all

elv.

This

way

of

command

signal

transmission distance is relatively close, the circuit breaker operation and power is

large, it is not suitable for 220500 kv substation.

Low voltage line selection control wiring is more complex, more operation steps,

hard

to

ensure

its

reliability.

220-500

kv

substation

circuit

breaker,

do

not

recommend using low voltage line selection control.

Common characteristic is due to the weak current control on the control panel

using the miniaturization of the weak current control device, the control panel on the

unit area can be assigned by the control loop. Under the condition of same number

of controlled object, compared with the high voltage control, can reduce the area of

the

control

panel,

convenient

monitoring

and

operational

personnel;

Reduced

the

master

control

room

construction

area,

reduce the

investment in

civil

engineering.

This is a major advantage of the weak current control. But weak current equipment

there is insufficient, low voltage terminal and weak current equipment of electrical

insulation distance is small, be afraid of dust, especially under the condition of dust

containing conductive material more dangerous; Weak current equipment terminals

and screen after the weak current connection terminals and soft line connection with

welding,

due

to

close

the

distance

between

the

terminal,

when

check

line

and

cleaning pay special attention to prevent short circuit between terminals; In addition,

there

is

low

mechanical

strength,

off

contact

capacity

small,

poor

anti- jamming

performance shortcomings.

High voltage control can be divided into high voltage one to one direct control

and

high

voltage

line

selection

control.

Very

few

of

the

latter

in

the

practical

engineering applications. High voltage one to one direct control method has simple

control circuit, power supply voltage of a single operation, the operation personnel

easy to grasp, convenient maintenance, high reliability advantages, all kinds of used

in substation is put into operation a major control method.

High

voltage

control,

because

of

the

working

voltage

of

control

equipment

is

higher, to meet the requirements of insulation distance, control equipment, terminal

equipment such as the volume is big, and within the unit area on the control panel

can decorate less control goes back from them. In substation scale, more cases of the

object, and the control panel. This not only increases the surface area of the main

control room, increasing the cost of civil engineering, at the same time, due to the

large surveillance plane, is unfavorable to the normal monitoring and operation.

At

present,

the

control

method

is:

one

to

one

direct

control,

station

is

not

a

conventional

control

panel,

control

was

achieved

by

independent

measurement

device. The old station is also gradually according to the methods of modification.

When

in

breaker

control

circuit

design

should

pay

attention

to

the

following

basic requirements.

(1) shall have the monitoring circuit of the control power. Circuit breaker control

power is the most important, once lost power supply, circuit breaker can't operate.

Whatever

the

reason,

therefore,

when

the

circuit

breaker

control

power

supply

disappears,

should

sound

and

light

signals,

prompt

the

personnel

on

duty

timely

processing.

(2) should be regularly monitored circuit breaker jump, switching circuit integrity,

when tripping or switching circuit malfunction, should signal circuit breaker control

circuit disconnection.

(3) should be prevent electric lock circuit breaker

breaker is very dangerous, easy to cause body damage, even caused an explosion of

the

circuit

breaker,

so

blocking

measures

must

be

taken.

At

present,

the

microcomputer protection device and the operation of the circuit breaker loop in the

default

configuration,

have

prevent

breaker

electrical

circuits.

Practical

application, use and can only use one to prevent the circuit breaker electric circuits

of the

part of the circuit.

On February 2, 1997, 220 kv line A phase fault of A certain power plant, line on

both

sides

of

the

right

protection

device,

but

when

reclosing

circuit

breaker

are

produced on both sides

circuit

breaker

open

final

in

a

row,

hydraulic

fell

sharply,

circuit

breaker

stay

in

us