ABB Relion 650 Series Technical Manual page 714

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Inverse time characteristics

EQUATION1197 V2 EN-US

The set value t

is the reset time in case of zero current after fault clearance.

The possibility of choice of reset characteristics is to some extent dependent of the

choice of time delay characteristic.

For the definite time delay characteristics the possible reset time settings are

instantaneous and IEC constant time reset.

For ANSI inverse time delay characteristics all three types of reset time

characteristics are available; instantaneous, IEC constant time reset and ANSI

current dependent reset time.

For IEC inverse time delay characteristics the possible delay time settings are

instantaneous and IEC set constant time reset).

For the programmable inverse time delay characteristics all three types of reset

time characteristics are available; instantaneous, IEC constant time reset and ANSI

current dependent reset time. If the current dependent type is used settings pr, tr

and cr must be given, see equation 47:

EQUATION1198 V2 EN-US

For RI and RD inverse time delay characteristics the possible delay time settings

are instantaneous and IEC constant time reset.

When inverse time overcurrent characteristic is selected, the

operate time of the stage will be the sum of the inverse time delay

and the set definite time delay. Thus, if only the inverse time delay

is required, it is important to set the definite time delay for that

stage to zero.

1MRK 511 424-UEN B

(Equation 46)

(Equation 47)

GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4

Bay control REC650 2.2 IEC

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