ABB RELION REX640 Technical Manual page 862

Protection and control

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Protection functions

Figure 485: Behavior of different IDMT reset modes. Operate signal is based on

settings Type of reset curve = "Def time reset" and Type of time reset= "Freeze Op

timer". The effect of other reset modes is also presented

time for IDMT. The setting is applicable only when the IDMT curves are used.

The Timer calculates the start duration value START_DUR, which indicates the

percentage ratio of the start situation and the set operation time. The value is

available in the Monitored data view.

Blocking logic

There are three operation modes in the blocking function. The operation modes are

controlled by the BLOCK input and the global setting in Configuration > System >

Blocking mode which selects the blocking mode. The BLOCK input can be controlled

Time multiplier setting is used for scaling the IDMT operate times.

Minimum operate time setting parameter defines the minimum desired operate

Minimum operate time setting should be used with care because the

operation time is according to the IDMT curve, but always at least the

Minimum operate time setting. For more information, see

value of the

Chapter 11.3.2 IDMT curves for undervoltage protection

1MRS759142 F

in this manual.

Technical Manual