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140DAI75300 SCHNEIDER

Brand: Schneider

Model number:140DAI75300

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

140DAI75300   SCHNEIDER

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Products Name: 140DAI75300 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:

When short time delay protection is used with autoreclose, the scheme is normally arranged 

to block the instantaneous protection after the first trip. Therefore, if the fault persists after reclosing, time-graded protection will give discriminative tripping with fuses or other protection 

devices, resulting in the isolation of the faulted section. However, for certain applications, 

where the majority of the faults are likely to be transient, it is not uncommon to allow more 

than one instantaneous trip before the instantaneous protection is blocked. 

Some schemes allow a number of re-closings and time graded trips after the first 

instantaneous trip, which may result in the burning out and clearance of non-permanent 

faults. Such an approach may also be used to allow fuses to operate in teed feeders where 

the fault current is low. 

Any decision to apply the autoreclose function would be influenced by all data known on the 

frequency of transient faults (for instance feeders which consist partly of overhead lines and 

partly of underground cables). When a significant proportion of the faults are permanent, the 

advantages of autoreclose are small, particularly since re-closing on to a faulty cable is likely 

to aggravate the damage. 

5.2 Description of the function 

5.2.1 Autorecloser activation 

The autoreclose function is activated using “AUTOMAT. CTRL/ PROTECTION G1” menu. 

The same settings apply for the Menu PROTECTION G2. 

The autoreclose function of the relay is available only if the following conditions are verified: 

− The auxiliary contact of the CB status 52a must be connected to the relay. 

Refer to the “AUTOMAT. CTRL/Inputs” menu 

− The trip output relay RL1 must not be latched to the earth and/or phase protection 

function. 

Refer to the “AUTOMAT. CTRL/Latch functions” menu 

NOTE: If the auxiliary supply is lost during an autoreclose cycle, the 

autoreclose function is totally disabled. 

In addition to Autoreclose settings, the user will be able to fully link the autoreclose function 

to the protection function using the menus “PROTECTION G1/Phase OC” and 

“PROTECTION/E/Gnd”. 

5.2.2 Logic Inputs 

The autoreclose function has four inputs that can be assigned to the autoreclose logic. 

These inputs can be opto-isolated inputs configured for that under the “AUTOMAT. CTRL” 

menu. External contacts can then be wired to be used as an input and influence the 

autorecloser scheme. These 4 inputs are: 

− one external CB fail, 

− two external starting orders, 

− one external blocking order. 

The following table gives the “AUTOMAT.CTRL/Inputs” menu assigned to the autoreclose 

logic input. The second column presents the menu disabling the function if not assigned in 

the “PROTECTION G1/Autoreclose” menu (Setting = No).


140DAI75300   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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