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PC-A984-141 SCHNEIDER

Brand: Schneider

Model number:PC-A984-141

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

PC-A984-141    SCHNEIDER

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Products Name: PC-A984-141 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:

The A phase charging current (Ia), is then shown to be leading the resultant A phase voltage 

by 90°. Likewise, the IB phase charging current leads the resultant voltage Vb by 90°. 

The unbalance current detected by a core balance current transformer on the healthy 

feeders can be seen as the vector addition of Ia1 and Ib1 (Ia2 and Ib2), giving a residual 

current which lies at exactly 90° anticipating the polarising voltage (Vr=3Ve). 

The vector diagram indicates that the residual currents on the healthy and faulted feeders, 

IH1& IH2 and IR3 respectively, are in opposite direction to each other (180°). A directional 

element could therefore be used to provide discriminative earth fault protection. 

If the polarising voltage of this element, equal to 3Ve, is shifted through +270°, the residual 

current seen by the relay on the faulted feeder will lie within the operate region (Trip Zone) of 

the directional characteristic. As previously stated, the required RCA setting for the sensitive 

earth fault protection when applied to insulated systems, is 270°. 

2.4.3 Wattmetric (Pe) Characteristic 

The P125, P126 and P127 relays include the zero sequence power measurement function. 

They also offer the possibility to choose between a Wattmetric (Pe) protection and IeCos 

(active component of the earth fault current) protection functionality mode. 

The following figure shows the characteristic tripping zone for the wattmetric protection. 

Pe> Pe>>

IeCos> IeCos>>

Pe/IeCos

Q/IeSin

5˚ 5˚

Tripping zone

P0365ENa

In the following formula the power thresholds in the relay menu are called Pe> & Pe>>. 

The Pe> and Pe>> settings are calculated as: 

Vres x Ires x Cos (f – fc) = 9 x Ve x Ie x Cos (f – fc) 

Where: 

f = angle between the polarising voltage (Vres) and the residual current

fc = relay characteristic angle (RCA/torque angle) 

Vres = residual voltage 

Ires = residual current 

Ve = zero sequence voltage 

Ie = zero sequence current 

2.4.3.1 Setting Guidelines for Pe Thresholds 

The Pe thresholds are displayed in the format: ##.## x Ien W 

In this formula the ##.## setting value is multiplied by the setting value of the Ien. 

The threshold value is expressed in Watt secondary. 

Example: The Pe> threshold is to be set from the relay front panel and the setting value is 

20W.


PC-A984-141    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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