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XBT-A121010 SCHNEIDER

Brand: Schneider

Model number:    XBT-A121010

Colour:new                  

Warranty: 12 months

Lead Time:3-day working day   

Country of origin: USA Price: Please contact us         

Product weight:0.40kg

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

XBT-A121010   SCHNEIDER    Central control module

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Products Name: XBT-A121010 SCHNEIDER

PRODUCT DESCRIPTION

It is very difficult to optimize the dead time due to the great diversity of load on a system. However, it is possible to study each type of load separately and thereby be able to define a typical dead time.

Description:

Reclaim Timer Setting 

A number of factors influence the choice of the reclaim timer, such as: 

− Supply continuity - long reclaim times can result in unnecessary lockout for transient 

faults. 

− Fault incidence and past experience - short reclaim times may be required where 

there is a high incidence of lightning strikes to prevent unnecessary lockout for 

transient faults. 

− Spring charging time - for high-speed autoreclose the reclaim time may be set longer 

than the spring charging time to ensure there is sufficient energy in the circuit breaker 

to perform a trip-close-trip cycle. For delayed autoreclose there is no need to set the 

reclaim time longer than the spring charging time as the dead time can be extended 

by an extra CB healthy check window time if there is insufficient energy in the CB. If 

there is insufficient energy after the check window time has elapsed the relay will 

lockout. 

− Switchgear maintenance - excessive operation resulting from short reclaim times can 

mean shorter maintenance periods. A minimum reclaim time of >5 s may be needed 

to allow the CB time to recover after a trip and close operation before it can perform 

another trip-close-trip cycle. This time will depend on the duty (rating) of the CB. 

− The reclaim time must be long enough to allow any time-delayed protection initiating 

autoreclose to operate. Failure to do so would result in premature resetting of the 

autoreclose scheme and re-enabling of instantaneous protection.

− If this condition arose, a permanent fault would effectively look like a number of 

transient faults, resulting in continuous autoreclose operations unless additional 

measures were taken to overcome this, such as excessive fault frequency lockout 

protection. 

− A sensitive earth fault protection is usually applied to detect high resistance earth 

faults. 

Usually, a long trip delay time is set, typically 10 - 15 s. This longer time may be taken 

into consideration, if autoreclose is started by an earth fault protection, and when 

deciding on a reclaim time, if the reclaim time is not blocked by a SEF protection start 

signal. Sensitive earth faults, for example, a broken overhead conductor in contact 

with dry ground or a wood fence, is rarely transient and presents great danger to 

persons and animals. It is therefore common practice to block autoreclose by 

operation of sensitive earth fault protection and lockout the circuit breaker. 

− Where motor-wound spring closed circuit breakers are used, the reclaim time must be 

at least as long as the spring winding time for high-speed autoreclose to ensure that 

the breaker can perform a trip-close-trip cycle. 

− A typical 11/33kV reclaim time is 3 - 10 seconds; this prevents unnecessary lockout 

during thunderstorms. However, reclaim times up to 60 - 180 seconds maybe used.


XBTB7110   SCHNEIDER

Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

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