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140CPU11302 SCHNEIDER

Brand: Schneider

Model number:140CPU11302 

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

140CPU11302   SCHNEIDER

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Products Name: 140CPU11302 SCHNEIDER

PRODUCT DESCRIPTION

The TAC Stainless Plate temperature sensors aremounted on the back of a 1 Gang stainless steelplate. The foam pad will insulate the sensor from any drafts in the wall. (2) 6/32” x 1” machine screws are provided for junction box mounting. Be sure that the sensor is not mounted on an outside wall, due to the extreme temperature changes from either drafts or heat transfer.

Description:

 Introduction 

The restricted earth fault relay is a high impedance differential scheme which balances zero 

sequence current flowing in the transformer neutral against zero sequence current flowing in 

the transformer phase windings. Any unbalance for in-zone fault will result in an increasing 

voltage on the CT secondary and thus will activate the REF protection. 

This scheme is very sensitive and can then protect against low levels of fault current in 

resistance grounded systems where the earthing impedance and the fault voltage limit the 

fault current. 

In addition, this scheme can be used in a solidly grounded system. It provides a more 

sensitive protection, even though the overall differential scheme provides a protection for 

faults over most of the windings. 

The high impedance differential technique ensures that the impedance of the circuit is of 

sufficiently high impedance such that the differential voltage that may occur under external 

fault conditions is lower than the voltage required to drive setting current through the relay. 

This ensures stability against external fault conditions and then the relay will operate only for 

faults occurring inside the protected zone. 

2.10.2 High impedance principle 

High impedance schemes are used in a differential configuration where one current 

transformer is completely saturated and the other CTs are healthy. 

Healthy CT

Z m

RCT1

R L1

VS R ST

R L2 R L4

R L3

R

RCT2

Z m A - G

Saturated CT

Protected 

circuit

I F

HIGH IMPEDANCE SCHEME PRINCIPLE 

The voltage applied across the relay is: 

Vr=If (RCT + 2RL) 

If : Maximum secondary external fault current. 

RCT : Resistance of the Current transformer secondary winding. 

RL : Resistance of a single wire from the relay to the CT. 

A stabilizing resistor R ST can be used in series with the relay circuit in order to improve the 

stability of the relay under external fault conditions. This resistor will limit the spill current 

under Is. 

Vs=Is (RST)

Is: Current relay setting 

Vs: Stability Voltage setting 

Note that the relay consumption has been taken into account.


140CPU67260   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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