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140DAI54000 SCHNEIDER

Brand: Schneider

Model number:140DAI54000

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

140DAI54000   SCHNEIDER

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Products Name: 140DAI54000 SCHNEIDER

PRODUCT DESCRIPTION

As soon as a phase threshold is running, the instantaneous output associated with this threshold is activated. This output indicates that the protection element has detected a phase fault and that the time delay associated with the threshold has started.

Description:

Introduction 

An analysis of faults on any overhead line network has shown that: 

− 80 - 90% are transient in nature, 

− the remaining 10-20% of faults are either non-permanent (arcing fault) or permanent. 

A transient fault is a self-clearing ‘non-damage’ fault. This type of fault can be isolated and 

cleared by the immediate tripping of one or more circuit breakers, and does not recur when 

the line is re-energised. The most common cause of transient faults are lightning, insulator 

flashover clashing conductors and wind blown debris. 

The immediate trip will not clear a non-permanent or permanent fault, and the use of the 

recloser may be necessary to clear it. A small tree branch falling on the line could cause a 

non-permanent fault. Permanent faults could be broken conductors, transformer faults, cable 

faults or machine faults that must be located and repaired before the supply can be restored. 

Most of the time, if the faulty line is immediately tripped, and the fault arc has sufficient time 

to de-ionise, reclose of the circuit breakers will result in the line being successfully reenergised. Autoreclose schemes are used to automatically reclose a switching device once a 

time delay has elapsed and starting after the CB has opened. 

On HV and MV distribution networks, the autoreclose function is applied mainly to radial 

feeders where system stability problems do not generally arise. Using the autoreclose 

minimises time of interruption and reduces operating costs. 

Automatic autorecloser allows a substation to operate unattended:the number of visits to 

manually reclose a circuit breaker is substantially reduced. This feature constitutes therefore 

an important advantage for substations supervised remotely. 

On circuits using time graded protection, the automatic autorecloser allows the use of 

instantaneous protection to give a high speed first trip. With fast tripping, the duration of the 

power arc resulting from an overhead line fault is reduced to a minimum, thus lessening the 

chance of damage and to develop the transient fault into a permanent fault. 

Using short time delay protection prevents blowing of fuses and reduces circuit breaker 

maintenance by eliminating pre-arc heating when clearing transient faults. 

The next figure shows an example of 4 autoreclose cycles (maximum numbers of allowed 

cycles) to the final trip (in the following diagram, td1, td2, td3, td4 = dead time 1, 2, 3 and 4 

timers, tr = Reclaim time, O = CB open and C = CB closed).


140DAI45300   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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