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2.1 Maximum number of protection
stages in one application
2 Protection functions
Technical description
44
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VM55.EN005
2.
Protection functions
Each protection stage can independently be enabled or disabled
according to the requirements of the intended application.
2.1.
Maximum number of protection
stages in one application
The device limits the maximum number of enabled stages to
about 30, depending of the type of the stages. For more
information, please see the configuration instructions in
chapter 2.4 in the Operation and Configuration instruction.
2.2.
General features of protection stages
Setting groups
Most stages have two setting groups. Changing between setting
groups can be controlled manually or using any of the digital
inputs, virtual inputs, virtual outputs or LED indicator signals.
By using virtual I/O the active setting group can be controlled
using the local panel display, any communication protocol or
using the inbuilt programmable logic functions.
Forcing start or trip condition for testing
The status of a protection stage can be one of the followings:
Ok = „
„
The stage is idle and is measuring the analog
quantity for the protection. No fault detected.
Blocked
The stage is detecting a fault but blocked by
some reason.
Start
The stage is counting the operation delay.
Trip
The stage has tripped and the fault is still on.
The blocking reason may be an active signal via the block
matrix from other stages, the programmable logic or any digital
input. Some stages also have inbuilt blocking logic. For more
details about block matrix, see chapter 5.6.
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