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170ANR12091 SCHNEIDER

Brand: Schneider

Model number:170ANR12091

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

170ANR12091    SCHNEIDER

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Products Name: 170ANR12091 SCHNEIDER

PRODUCT DESCRIPTION

If the panel meters show that the generator voltage is different from that of the bus, the voltage offset potentiometer may need adjustment. Make sure that the 

panel meters are accurate, calibrated, and at operating temperature. Most panel meters are accurate to ±3% and are not temperature compensated.

Description:

In this case, a correct discrimination is achieved by means of an Iecos characteristic, as the 

faulted feeder will have a large active component of residual current, whilst the healthy 

feeder will have a small value. 

For insulated earth applications, it is common to use the Iesin characteristic that can be 

obtained by the setting of the characteristic angle to 90° or 270°. 

2.5 Derived earth overcurrent (Ie_d>, P127 only) 

The derived earth overcurrent element protection is used to cover applications such as 

HTB/HTA transformers. The derived earth current (Ie_d>) is the vectorial summation: 

IA + IB + IC: 

IA + IB + IC = Ie_d>. 

The derived earth overcurrent has two independent thresholds: Ie_d> and Ie_d>>. 

The two thresholds can be set as definite delay time or inverse delay time using the IEC, 

IEEE/ANSI, CO, RI and RECT curves. Their parameters are shown in the Technical Data 

chapter of this Technical Guide. 

IA

IB

IC

Ie = Tank Earth

IA+IB+IC = Ie>>>>

IA

IB

IC

Ie = Tank Earth

IA+IB+IC = Ie_d>

P3940ENb

As soon as Ie_d> threshold is running, the instantaneous output associated with this 

threshold is activated. This output indicates that the protection element has detected an 

earth fault and that the time delay associated with the threshold has started. This time delay 

can be blocked via the logic input "Block Logic" associated with this threshold. If this blocking 

input is activated by an output contact of a downstream relay, the logic that will lead to the 

trip command is then blocked only if the relay that is the closest to the fault can see and 

therefore eliminate the fault. This principle is known as «Blocking logic» or «Blocking». It is 

described in more detail in this document.


170ANR12091    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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