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140DAI35300 SCHNEIDER

Brand: Schneider

Model number:140DAI35300

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

140DAI35300   SCHNEIDER

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Products Name: 140DAI35300 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:

Under/Over frequency (81 U/O) 

4.1.1 Description 

Time delayed under and over frequency protection available on P127 provides the 

fundamental form of frequency protection. 

Six thresholds are available: Each one can be configured to detect an under or over 

frequency within the range [fn – 4,9Hz, fn + 4,9Hz], where fn is the nominal frequency 

selected (50Hz or 60Hz). A definite timer is assigned to each threshold. 

When the frequency measured is crossing one of the 6 pre-defined thresholds, the relays 

generates a start signal and after a user settable time delay, a trip signal. 

NOTE: Under / Over frequency protection is available when voltage inputs are 

connected. 

4.2 Rate of frequency change protection (dF/dt) (81R) 

4.2.1 Description 

The calculation of the rate of change of frequency is an average measurement of the 

instantaneous values over a programmable number of cycles (1 to 200); refer to the 

‘CONFIGURATION / General options" menu. The instantaneous values of rate of change of 

frequency are measured every cycle (20ms at 50Hz). The rate of frequency change 

elements are very important to detect any power loss under severe disturbances and 

eventually perform load shedding of secondary load. 

These elements offer the possibility to detect the tendency of the variation of frequency, and 

thus re establish the correct load/generation without waiting for big frequency reduction. 

These elements could be combined to the frequency elements using the AND logic 

equations to provide a very useful mechanism allowing a more secure trip decision to be 

achieved during transient system disturbances. 

According ‘CONFIGURATION / General options’ setting, this function will be inhibited in the 

following case: 

− if the voltage level for each phase is below the settable undervoltage blocking value 

(see “Prot. Freq. Block U<” cell), 

− if the frequency is out of range: fmeasured > (fn+20Hz) or fmeasured < (fn–20Hz) 

− if dF/dt > ±20hz/s and “Inhib. dF/dt>20Hz/s” is set to “No”.


140CPS42400   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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