GE Multilin 745

Target and Flash Messages745
Transformer Management Relay
Actual Values
http://www.GEindustrial.com/multilin
6–18
GE Multilin
A typical active target message looks like this,
and consists of three components which are arranged as follows:
The
<STATUS> part of the above message will be one of PICKUP, OPERATE or
LATCHED:
• PICKUP: Indicates that the fault condition that is required to activate the
protection element has been detected by the 745 but has not persisted for a
sufficiently long time to cause the relay to activate its protection function.
• OPERATE: Indicates that the protection element has been activated.
• LATCHED: Indicates that the protection element is (or was) activated. This
display will remain even if the conditions that caused the element to activate
are removed.
The
<PHASE> part of the message represents the phase(s) that are associated with
the element (where applicable).
Messages for
LATCHED targets remain in the queue until the relay is reset.
Messages for
PICKUP and OPERATE targets remain in the queue as long as the
condition causing the target to be active is present. In addition, messages for
LATCHED targets will automatically be deleted if an entire week passes without any
changes to the state of the target messages but the conditions that caused the
LATCHED messages to be displayed originally are no longer present.
The bottom line of the display (i.e.,
<CAUSE>) will be the name of the element that
has been activated. These are as follows:
! LATCHED: a
! Percent Differentl
! <STATUS>: <PHASE>
! <CAUSE>
Table 6–2: Target Message Causes
Percent Differentl Inst Differential W1 Phase Time OC
W2 Phase Time OC W3 Phase Time OC W1 Phase Inst OC 1
W2 Phase Inst OC 1 W3 Phase Inst OC 1 W1 Phase Inst OC 2
W2 Phase Inst OC 2 W3 Phase Inst OC 2 W1 Ntrl Time OC
W2 Ntrl Time OC W3 Ntrl Time OC W1 Ntrl Inst OC 1
W2 Ntrl Inst OC 1 W3 Ntrl Inst OC 1 W1 Ntrl Inst OC 2
W2 Ntrl Inst OC 2 W3 Ntrl Inst OC 2 W1 Gnd Time OC
W2 Gnd Time OC W3 Gnd Time OC W1 Gnd Inst OC 1
W2 Gnd Inst OC 1 W3 Gnd Inst OC 1 W1 Gnd Inst OC 2
W2 Gnd Inst OC 2 W3 Gnd Inst OC 2 W1 Rest Gnd Fault
W2 Rest Gnd Fault W3 Rest Gnd Fault W1 Neg Seq Time OC
W2 Neg Seq Time OC W3 Neg Seq Time OC W1 Neg Seq Inst OC
W2 Neg Seq Inst OC W3 Neg Seq Inst OC Underfrequency 1
Underfrequency 2 Freq Decay Rate 1 Freq Decay Rate 2
Freq Decay Rate 3 Freq Decay Rate 4 Overfrequency
5th Harmonic Level Volts-per-hertz 1 Volts-per-hertz 2
W1 THD Level W2 THD Level W3 THD Level
W1 Harmonic Derating W2 Harmonic Derating W3 Harmonic Derating
Analog Level 1 Analog Level 2 W1 Current Demand
W2 Current Demand W3 Current Demand Xformer Overload
Logic Input 1 (to 16) Virtual Input 1 (to 16)