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3.2 NON-DIRECTIONAL OVERCURRENT LOGIC

I>1 Timer Block

I>1 Start A

I>1 Trip A

I>1 Start

I>1 Trip

AR Blk Main Prot

I> Blocking

IA2H Start

I> Blocking

V00601

AR Blocks I>3

2H Blocks I>1

2H 1PH Block

I>1 Current Set

IDMT/DT

I>1 Start B

I>1 Trip B

IB2H Start

I> Blocking

2H Blocks I>1

2H 1PH Block

I>1 Current Set

IDMT/DT

I>1 Start C

I>1 Trip C

IC2H Start

I> Blocking

2H Blocks I>1

2H 1PH Block

I>1 Current Set

IDMT/DT

I2H Any Start

I> Blocking

2H Blocks I>1

2H 1PH Block

AR blocking available for DT-only stages

Timer Settings

Notes: This diagram does not show all stages . Other stages follow similar

principles.

AR blocking is only available for stages 3, 4 and 6

Figure 34: Non-directional Overcurrent Logic diagram

Phase Ov

ercurrent Modules are level detectors that detect when the current magnitude exceeds a set threshold.

When this happens, a Start signal is generated unless it is inhibited by a blocking signal. This Start signal initiates

the timer module, which can be configured as an IDMT timer or DT timer, depending on the stage number. The

Start signal is also available for use in the PSL. For each stage, there are three Phase Overcurrent Modules, one for

each phase. The three Start signals from each of these phases are combined to form a 3-phase Start signal.

The Start signals can be blocked by the Second Harmonic blocking function; on a per phase basis (single-phase

blocking) or for all three phases at once (three-phase blocking). The relevant bits are set in the I> Blocking cell and

this is combined with the relevant second harmonic blocking DDBs.

The timer can be configured with several settings depening on which type of timer is selected. Taking stage 1 as

an example:

The setting I>1 Time Delay sets the DT time delay

The setting I>1 TMS sets the Time Multiplier setting for IEC IDMT curves

The setting I>1 Time Dial sets the Time Multiplier setting for IEEE/US IDMT curves

The setting I>1 DT Adder adds a fixed time delay to the IDMT operate characteristic

P14x Chapter 6 - Current Protection Functions

P14xEd1-TM-EN-1 99

Brand	GE
Model	MiCOM P143 Agile
Category	Control Unit
Language	English

GE MiCOM P143 Agile User Manual

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