ABB REX010 HESG324426R0001 HESG324389 Earth Fault Protection Unit

REX010 HESG324426R0001 HESG324389 Earth Fault Protection Unit

Functional Description

The earth fault protection is based on the injection of a coded signal. The resulting offset voltage is utilized to calculate the earth resistance (Rf).

The injection signal is produced in the injection unit REX010 and applied to the generator through the transformer unit REX011. For the coupling to the protected unit resistors (RE, RP) are used. For the rotor earth fault protection two capacitors are required in addition.

The measurement signals for earth fault protection are processed by the REG216 or the REG316*4 respectively.

The equipment described protects 100% of the generator stator winding. Two independent protection functions are applied: one for 95% and one, using a different algorithm, for 100% of the stator winding. The 100% function is calculating the earth resistance and the 95% function is measuring the neutral voltage displacement of the generator.

a) The 100% function protects 35% of the stator windings from the neutral point for Rf = 0 and I0max = 15 A

b) The 95% function (U>) protects 95% of the generator stator winding from the terminals. 

The 100% function increases in sensitivity with increasing earth fault resistance and decreasing earth fault current.

Features

· Compact design

· Perfectly matched for the REG216/REG316*4

· Provides protection of the whole stator winding including the neutral point

· Continuous supervision of the injection voltage and the primary earthing system

· Suitable for two separate earthing points within the protected zone

· Continuous self-supervision of the injection signal with respect to amplitude and frequency

· Auxiliary DC power supply from station battery from 36 to 312 V DC

· Applicable for all commonly used earthingand excitation-systems for generators

· Continuous supervision of the insulation resistance and calculation of the earth fault resistance

· The principle is based on the well-known offset method, using injection of a low frequency signal

· Suitable for updating existing plants

· Insensitive to external disturbances

Technical Specifications

  Datasheet Link  

   ABB REX010 Datasheet Datasheet

100% brand new and original,All the goods will be tested before shipment.

For the in stock items, we will send the order out within 5-7 days after receive the payment.

Global supplier of quality automation and control components.

Topteng offers a 12-month warranty from the date of delivery.

In the event of non-conforming product ( if damaged or incorrect product is received ),

Any nonconformity must be reported within 7 days of receipt of goods.

Questions? Call +86 18050017653  or Email sales4@nseauto.com