MF DIGITAL 5907-VL Especificações descarregar pdf (Página 21)

3WL Air Circuit Breakers

Siemens · 2012

3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)

General data

3WL circuit breakers for DC applications

This version of the 3WL non-automatic air circuit breaker is suit-

able for direct current applications. The external protective de-

vice DIGmat S100 provides adjustable overload and short-cir-

cuit protection for 3WL non-automatic air circuit breakers.

This is based on the measuring chain of a shunt resistor and the

DIGmat S100 tripping unit. Shunt resistors are available for

1000 A, 2000 A and 4000 A (special ranges on request).

They are in accordance with DIN 43703 and have a class

accuracy of 0.5.

A measuring-circuit voltage of 60 mV DC is picked off for rated

current

The measuring-circuit voltage is a linear image of the primary

current.

The DIGmat S100 tripping unit monitors the image of the primary

current thus supplied and compares it with the tripping charac-

teristic curve set on the device. The parameter settings on the

DIGmat S100 apply also for DC feedbacks.

Reversing duty is possible therefore.

The tripping characteristic curve is determined and described

by the following

variables:

• Overload protection:

Setting range

= 0.4 ... 1.0

The characteristic curve has an

characteristic.

The tripping time

can be selected between 2 and 10 s,

although

for 6 ×

is defined.

DIGmat S100

• Short-circuit protection:

Setting range

= 1.25 ×

up to max. 4 ×

If the set value is exceeded, tripping occurs in less than

50 ms.

= Rated current of the circuit breaker

= Set current value of the adjustable overload release

= Assigned tripping time of the overload trip

= Instantaneous tripping current of the adjustable short-cir-

cuit releases

The components are available only from the company

mat – Maschinen- und Anlagentechnik:

mat – Maschinen- und Anlagentechnik

Dr. Becker GmbH

Rudolf-Diesel-Straße 22

D-22941 Bargteheide

Tel.: +49 (4532) 20 21-01

Fax: +49 (4532) 20 21-21

E-mail: [email protected]

Internet: www.m-a-t.de

■

Configuration

Mutual mechanical circuit breaker interlocking

The module for mutual mechanical interlocking can be used for

one or two 3WL circuit breakers and can be adapted easily to

the corresponding versions. The fixed-mounted and withdraw-

able circuit breaker versions are fully compatible and can there-

fore be used in a mixed configuration in an installation. This also

applies to 3WN6 circuit breakers.

The circuit breakers can be mounted alongside each other or

one above the other, whereby the distance of the circuit breakers

is determined solely by the length of the Bowden wire (lengths:

2 m/3 m/4.5 m). Interlock signals are looped through using the

Bowden cables. Interlocking is only effective in the connected

position in the case of withdrawable circuit breakers. The me-

chanical endurance of the Bowden cables is 10000 operating

cycles.

Minimum requirements must be fulfilled in the switchgear for the

interlocking to function:

• Bowden cables must be installed as far as possible in a

straight line with minimum bending.

• The bending radii of the Bowden wire must be > 500 mm.

• The sum of all bending angles along the Bowden cable must

not exceed 640°.

• In a vertical arrangement of circuit breakers to be interlocked,

the interlocking mechanisms must be in line.

• Circuit breakers to be interlocked must be arranged so that

Bowden cables can be optimally installed in compliance with

the conditions mentioned in the above points.

• The installed Bowden cable must be fixed (with cable ties or

the like) before the interlock is adjusted.

• Select the width of switchgear cubicle to allow enough free-

dom of movement for adjusting the interlock!

• Openings and cut-outs in system elements must be designed

so that Bowden cables are not changed in direction or ob-

structed when they are passed through.

Mutual mechanical interlocking of circuit breakers – examples

Mutual interlocking of two

circuit breakers

Interlocking between three

circuit breakers

Mutual interlocking of three

circuit breakers

Interlocking of three circuit

breakers, two of them mutual

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NSE01043

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