ABB RELION REX640 Technical Manual page 1050

Protection and control

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Table of Contents

Protection functions

Figure 586: Mho operation characteristics

The reach of inner circle is defined by the settings

reverse . Angle defined by settings Inner R1 and Inner X1 defines also reverse zone

angle. The reach of outer circle is defined by the settings

X1 reverse . Angle defined by settings Outer R1 and Outer X1 defines also reserve

The PSB and SWING_ST outputs can be blocked by activating BLOCK input. Blocking

also resets internal timers and impedance calculation.

Describe different application possibilities of the function. The application

information answers one or more of the following questions:

• The problem of the application

• The purpose of the function

• Solution for the problem in general level

• Where can the function be used?

• When can the function be used?

• The application information shall NOT describe what the user should consider

or should calculate, plan, dimension etc. to make the function work in the

applications.

Power swing detection functions detect power swing conditions by using the fact

that the voltage/current variation during a power swing is slow compared to the

step change during a fault. Both faults and power swings may cause the positive

sequence impedance to enter into the operating characteristic of a distance relay

Inner Rv Ld Ris Rch

-Outer X1 reverse

-Inner X1 reverse

Inner R1, Inner X1, Inner X1

Outer R1, Outer X1, Outer

Technical Manual

1MRS759142 F