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XBTB8141 SCHNEIDER

Brand: Schneider

Model number:    XBTB8141 

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

XBTB8141   SCHNEIDER    Processor module

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Products Name: XBTB8141 SCHNEIDER

PRODUCT DESCRIPTION

The autoreclose function provides the ability to automatically control the autorecloser (two, three or four shot cycle, settable using “Phase Cycles” and “E/Gnd Cycles” menu). Dead times for all the shots (reclose attempts) can be independently adjusted.

Description:

general dead times of 3 - 10 seconds are normally satisfactory, but there may be special 

cases for which additional time is required to permit the resetting of manual controls and 

safety devices. 

Loss of supply to lighting circuits, such as street lighting may be important for safety reasons 

as intervals of 10 seconds or more may be dangerous for traffic. The main considerations of 

supply interruptions for domestic customers are those of inconvenience. 

An important measurement criterion for many power utilities is the number of minutes lost 

per year to customers, which will be reduced on feeders using autoreclose and will also be 

affected by the dead time settings used. 

For high-speed autoreclose the minimum dead time of the power system will depend on the 

minimum time delays imposed by the circuit breaker during a tripping and re-closing 

operation. 

Since a circuit breaker is a mechanical device, it will have an inherent contact separation 

time. The operating time for a modern circuit breaker is usually within the range of 50 - 100 

ms, but could be longer with older designs. 

After tripping, time must be allowed for the mechanism to reset before applying a closing 

pulse. This resetting time will vary depending on the circuit breaker, but is typically 0.1 

seconds. 

Once the circuit breaker has reset, it can begin to close. The time interval between the 

energizing of the closing mechanism and the making of the contacts is termed the closing 

time. Owing to the time constant of a solenoid closing mechanism and the inertia of the 

plunger, a solenoid closing mechanism may take 0.3 s. A spring-operated breaker, on the 

other hand, can close in less than 0.2 seconds. 

Where high-speed re-closing is required, which is true for the majority of medium voltage 

applications, the circuit breaker mechanism itself dictates the minimum dead time. However, 

the fault de-ionizing time may also have to be considered. High-speed autoreclose may be 

required to maintain stability on a network with two or more power sources. For high-speed 

autoreclose the system disturbance time should be minimized by using fast protection, <50 

ms, such as distance or feeder differential protection and fast circuit breakers <100 ms. Fast 

fault clearances can reduce the required fault arc de-ionizing time. 

For stability between two sources a dead time of <300 ms may typically be required. When 

only considering the CB the minimum system dead time is given by the mechanism reset 

time plus the CB closing time. Thus, a solenoid mechanism will not be suitable for highspeed autoreclose as the closing time is generally too long.


XBTF032110   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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