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140XBP00300 SCHNEIDER

Brand: Schneider

Model number:140XBP00300

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

140XBP00300   SCHNEIDER

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Products Name: 140XBP00300 SCHNEIDER

PRODUCT DESCRIPTION

The protection element also provides a non-sensitive area to avoid instability due to small  asymmetries and unbalances that can generally be present in the network system. This  condition is represented by the characteristic reproduced below, where the hatched area is the tripping zone.

Description:

MiCOM P125/P126 & P127 Page 31/96 

The general stability conditions can be obtained when: 

Vs> K.If (RCT + 2RL) 

Where K is the stability factor. 

This stability factor is influenced by the ratio Vk/Vs which in turns governs the stability of the 

REF protection element for through faults . 

Vk = The Knee point voltage of the CT. 

To obtain a high speed operation for internal faults, the Knee point voltage Vk of the CT must 

be significantly higher than the stability voltage Vs . A ratio of 4 or 5 would be appropriate. 

For MiCOM P121, P122 and P123, we found the following results: 

K= 1 for Vk/Vs less or equal to 16 and 

K= 1.2 for Vk/Vs > 16. 

NOTE: The maximum internal fault level for stage 3 of 0.002 to 1In board 

must not exceed 20In. 

STAB

A

B

C

E/F Input

P0343ENa

CT CONNECTION DIAGRAM FOR HIGH IMPEDANCE REF APPLICATION 

2.10.3 Setting guide 

The characteristics of the relay and the value of K influence the stability of the scheme as 

explained here above. 

The typical setting values shall be chosen to provide a primary operating current less than 

30 % of the minimum earth fault level for a resistance earthed system. For a solidly earthed 

system, the typical setting shall provide an operating current between 10 and 60 % of the 

rated current. 

The primary operating current, at the secondary, depends on the following factors: 

− Current Transformer ratio 

− Relay operating current IS

− Number of CT in parallel with the relay element (n) 

− The inrush current of each CT (Ie) at the stability voltage 

Iop= CTRatio .(Is + n.Ie) 

Current setting should be selected for a high impedance element so that the primary current 

reaches its nominal current with a given CT, according to the following equation: 

Is < {(Iop / CTRatio) - n.Ie}


140CPU11303   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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