ABB RELION 670 SERIES Applications Manual page 449

Line distance protection

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1MRK 506 369-UUS -

Line distance protection REL670 2.2 ANSI

Application manual

Do not forget to adjust the setting of load encroachment resistance

RLdFwd in Phase selection with load encroachment (FDPSPDIS, 21 or

FRPSPDIS, 21) to the value equal to or less than the calculated value

RLdInFw. It is at the same time necessary to adjust the load angle in

FDPSPDIS (21) or FRPSPDIS (21) to follow the condition presented in

equation 418.

Index PHS designates correspondence to FDPSPDIS (21) or FRPSPDIS

(21) function and index PSD the correspondence to ZMRPSB (68)

EQUATION1737-ANSI V1 EN

Consider equation 419,

EQUATION1739-ANSI V1 EN

then it is necessary to set the load angle in FDPSPDIS (21) or FRPSPDIS (21) function to

not less than equation 420.

EQUATION1738-ANSI V1 EN

It is recommended to set the corresponding resistive reach parameters in reverse direction

(RLdOutRv and kLdRRv) to the same values as in forward direction, unless the system

operating conditions, which dictate motoring and generating types of oscillations,

requires different values. This decision must be made on basis of possible system

contingency studies especially in cases, when the direction of transmitted power may

change fast in short periods of time. It is recommended to use different setting groups for

operating conditions, which are changing only between different periods of year (summer,

System studies should determine the settings for the hold timer tH. The purpose of this

timer is, to secure continuous output signal from Power swing detection function

(ZMRPSB, 68) during the power swing, even after the transient impedance leaves

ZMRPSB (68) operating characteristic and is expected to return within a certain time due

Impedance protection

(Equation 418)

(Equation 419)

(Equation 420)