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140CPS21400 SCHNEIDER

Brand: Schneider

Model number:140CPS21400

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

140CPS21400   SCHNEIDER

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Products Name: 140CPS21400 SCHNEIDER

PRODUCT DESCRIPTION

When setting the relay characteristic/torque angle for the three phase directional overcurrent element, a positive angle setting was specified. This was due to the fact that we consider as polarising voltage, the phase voltage value in quadrature of the current under fault conditions. With directional earth fault protection, the residual current under fault conditions lies at an angle lagging the polarising residual earth fault voltage.

Description:

Setting Guidelines 

The relay with this type of protection element must be co-ordinated with any other overvoltage relay at other locations on the system. This should be carried out in a similar manner 

to that used for grading current operated protection devices. 

The protection element over-voltage has two programmable thresholds and two delay timers, 

tU>, tU>>. 

After a trip command the thresholds will be reset when all phase voltages have fallen below 

95% of setting values. 

The overvoltage protection element, which can be set as OR or AND logic, operates by 

comparing each UAB, UBC and UCA voltage input with the U>, U>> thresholds. 

NOTE: If the relay is connected in the mode 3Vpn to control the phase to 

neutral voltages, the thresholds must be multiplied by 3 . 

When OR operating logic is set and one or more voltage has risen above the threshold 

value, the tripping command is sent after the tripping timer has reached the set overtime 

condition. 

When AND operating logic is set and all of the voltage values have risen above the threshold 

value, the tripping command is sent after the tripping timer has reached the set overtime 

condition. 

Information as to the thresholds setting range can be found in the FT and TD parts of the 

technical guide. 

3.6 Negative sequence overvoltage protection 

Where an incoming feeder is supplying a switchboard which is feeding rotating plant (e.g. 

induction motors), correct phasing and balance of the ac supply is essential. Incorrect phase 

rotation will result in any connected motors rotating in the wrong direction. For directionally 

sensitive applications, such as elevators and conveyor belts, it may be unacceptable to allow 

this to happen 

Any unbalanced condition occurring on the incoming supply will result in the presence of 

negative phase sequence (nps) components of voltage. In the event of incorrect phase 

rotation, the supply voltage would effectively consist of 100% negative phase sequence 

voltage only 

3.6.1 Setting guideline 

The negative sequence overvoltage protection has two independent thresholds: V2> and 

tV2>. 

Any unbalanced condition occurring on the incoming supply will result in the presence of 

negative phase sequence (nps) components of voltage. In the event of incorrect phase 

rotation, the supply voltage would effectively consist of 100% negative phase sequence 

typical. 

The operation time of the element will be highly dependent on the application. A typical 

setting would be in the region of 5s. 

The relay will trip according to an inverse characteristic or a definite time characteristic for 

the first stage and according to a definite time characteristic for the second stage. 

The inverse characteristic is given by the following formula: 

 t = K / (M - 1) 

Where: K = Time Multiplier Setting 

 t = operating time in seconds 

 M = Applied input voltage / Relay setting voltage (Vs).


140CPS12420   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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