Crate LS1-131 Especificações descarregar pdf (Página 35)

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Model

Apparatus

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Page No

1SDH000460R0002

L5439

Transparent protection covers

a) Protection covers for opening and closing pushbuttons

These protection covers, applied over the opening and closing pushbuttons, prevent the corresponding circuit-breaker operations

except by using a special tool.

b) IP54 door protection

This is provided by means of a transparent plastic escutcheon plate which fully protects the front of the circuit-breaker and ensures

a degree of protection to IP54. Mounted on hinges, it is fitted with a key lock.

Interlock between circuit-breakers

This mechanism makes the mechanical interlock between two or three circuit-breakers (even of different sizes and in any fixed/

withdrawable version) by means of a flexible cable. The electrical circuit diagram for the electrical changeover by means of a

relay (to be provided by the customer) is supplied with the mechanical interlock. The circuit-breakers can be installed vertically

or horizontally.

4 types of interlocks are available:

type A: between 2 circuit-breakers (power supply + emergency)

type B: between 3 circuit-breakers (2 power supplies + emergency)

type C: between 3 circuit-breakers (2 power supplies + bus-tie)

type D: between 3 circuit-breakers (3 power supplies / a single closed circuit-breaker)

The emergency power supply is generally supplied in order to substitute the normal power supply in two cases:

- to supply safety services for people.

- to supply essential parts of the installation for other than the safety services.

The change over from the normal supply to the emergency supply, can be done manually (with a local or remote control) or

automatically. For the change over, the circuit-breakers must be supplied with the necessary accessories for the electrical remote

control and for electrical and mechanical interlocks provided for the changing over.

The accessories can be for example:

- the shunt opening release

- the shunt closing release

- the motor operator

- the auxiliary contacts

For the change over, the customer can use a suitable electronic relay, whose diagram is supplied by ABB SACE. The mechani-

cal interlocks between two or three circuit-breakers are made by means of cables that can be used for circuit-breakers installed,

either side-by-side or one over the other.

Table of feasible mechanical interlocks between two or three circuit-breakers

Type of

interlock

Number

of circuit-

breakers

Type of circuit-breaker Possible interlocks

A TWO

A normal power supply unit and an emergency

unit.

The first circuit-breaker can be closed only if the

second (emergency) breaker is open.

B THREE

Two normal power supply units and an emer-

gency unit.

The first and third circuit-breakers can be closed

only if the second (emergency) breaker is open.

The latter can be closed only if the first and third

are open.

C THREE

A unit of 2 supplies and a bus-tie.

The two half-busbars can be supplied by a

single transformer (bus-tie closed) or simultane-

ously by both (bus-tie open).

One or two circuit-breakers out of three can be

closed at the same time.

D THREE

A unit of 3 supplies / a single closed circuit-

breaker. Three supplies (generators or trans-

formers) on the same busbar for which parallel

operation is not allowed.

Only one of the three circuit-breakers can be

closed.

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