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140XTS10215 SCHNEIDER

Brand: Schneider

Model number:140XTS10215

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

140XTS10215    SCHNEIDER

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Products Name: 140XTS10215 SCHNEIDER

PRODUCT DESCRIPTION

Be prepared to make an emergency shutdown when starting the engine, turbine, or other type of prime mover, to protect against runaway or overspeed with possible personal injury, loss of life, or property damage.

Description:

General Setting Guidelines 

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. 

The following listed angle settings are recommended to fix the right direction of the earth 

fault for the various earthed systems. 

Resistance earthed systems 180° 

Insulated systems 270° 

Petersen Coil system 200° 

Transmission Systems (solidly earthed) 90°-120° 

The setting ranges for directional/non-directional earth fault and wattmetric protection 

(Pe/IeCos) can be found in the FT and TD chapters of the technical guide. 

2.4.2 An application of 67N in an Insulated Systems 

The advantage with an insulated power system is that during a single phase to earth fault 

condition, no high earth fault current will flow. Consequently, it is possible to maintain power 

flow on the system even with an earth fault condition present. However, this advantage is 

offset by the fact that the resultant steady state and transient over-voltages on the healthy 

phases can be very high. In general insulated systems will only be used in low or medium 

voltage networks where it does not prove too costly to provide the necessary insulation 

against such over-voltages. 

Higher system voltages would normally be solidly earthed or earthed via a low impedance. 

Operational advantages may be obtained by the use of insulated systems. 

However, it is still essential that detection of the earth fault condition is achieved. This is not 

possible if standard current operated earth fault protection equipment is used. One possibility 

for earth fault detection is by applying a residual over-voltage protection device. This 

functionality is provided by the MiCOM P125, P126 and P127 relays. 

However, fully discriminative earth fault protection on this type of system can only be 

achieved by earth fault protection element. This protection element is included in directional 

relays MiCOM P125, P126 & P127. 

It is essential that a core balance CT is used for high sensitive earth fault detection. This 

eliminates the possibility of spill current that may arise from slight mismatches between 

residually connected line CTs. It also enables a much lower CT ratio to be applied, thereby 

allowing the required protection sensitivity to be more easily achieved.


140XTS10206    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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