GE L30 User Manual

5-164 L30 Line Current Differential System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
Figure 5–62: CURRENT DIFFERENTIAL SCHEME LOGIC
OR
OR
859000A1.vsd
AND
AND
To remote relays
channel 1 and 2
IC IA IB
IC IB
IA
ACTUAL VALUES
VAG VBG VCG
SETTINGS
Compute charging current
Pos Seq Capac Reactance
Zero Seq Capac Reactance
SETTING
= 3
Number of Terminals
CT ratio matching
Compute sum
of currents
Compute local
restraint
SETTINGS
= User-selection
Signal Source
SETTING
= 2
Number of Channels
DATA FROM REMOTE 1
Channel 1 OK
Channel 1 ID Fail
Ó IA at Timestamp
2
Ó IB at Timestamp
2
Ó IC at Timestamp
2
DTT PHASE A DTT PHASE B DTT PHASE C
DATA FROM REMOTE 2
Channel 2 OK
Channel 2 ID Fail
Ó IA at Timestamp
2
Ó IB at Timestamp
2
Ó IC at Timestamp
2
DTT PHASE A DTT PHASE B DTT PHASE C
SETTINGS
Off = 0
Block
= Enabled
Function
= Enabled
DTT
Off = 0
Key DTT
AND
AND
OR
OR
CLOCK
SYNCHRONIZATION
SYSTEM
Clocks are
synchronized, phase
and frequency locked
loop PFLL is OK
AND
AND
AND AND
AND AND AND
OR
OR
OR
DATA FROM LOCAL END
Charging Current
Ó IA at Timestamp
2
Ó IB at Timestamp
2
Ó IC at Timestamp
2
CALCULATE
RUN
Process phasor
computations
I_0
IB IC
CALCULATE
RUN
Compute
phasors and
variance (local)
SETTING
Compute phasors
and variance
(remote 1)
CT Tap 1
RUN
I_0
IB IC
SETTING
Compute phasors
and variance
(remote 2)
CT Tap 2
RUN
I_0
IB IC
SETTINGS
Pickup
Restraint 1
Restraint 2 Breakpoint
| IB operate |
2
| IB restraint |
2
> 1
| IA operate |
2
| IA restraint |
2
> 1
| IC operate |
2
| IC restraint |
2
> 1
RUN
OR
AND
AND
AND
AND AND
AND
FLEXLOGIC OPERAND
STUB BUS OP
87L DIFF PFLL FAIL
87L DIFF CH1 FAIL 87L DIFF CH2 FAIL
87L DIFF CH1 LOSTPKT 87L DIFF CH2 LOSTPKT
87L DIFF CH1 CRCFAIL 87L DIFF CH2 CRCFAIL
87L DIFF CH1 ID FAIL 87L DIFF CH2 ID FAIL
87L DIFF BLOCKED
FLEXLOGIC OPERANDS
FLEXLOGIC OPERAND
87L DIFF OP
OR
87L DIFF KEY DTT
IA
IA
SETTING
Enbabled=1
Ground Function
FLEXLOGIC OPERAND
50DD SV
IA
SETTINGS
Ground Pickup
Ground Restraint
| IG operate |
2
| IG restraint |
2
> 1
RUN
FLEXLOGIC OPERAND
87L DIFF PKP G
SETTING
Ground Delay
T
PKP
0
RUN RUN
DTT PHASE B DTT PHASE C DTT PHASE A
To remote relays channel 1 and 2
OR
OR
OR
OR
AND AND AND
OR
OR OR
AND
FLEXLOGIC OPERANDS
87L DIFF OP G
FLEXLOGIC OPERAND
87L DIFF RECVD DTTOR
SETTINGS
In-Zone Transformer
Enable=1
RUN
1. zero sequence current removal 2. 2
nd
harmonics
calculation
RUN
In-zone transformer phase and magnitude compensation
RUN
In-zone transformer phase and magnitude compensation
SETTINGS
SETTINGS
INRUSH INHIBIT MODE
INRUSH INHIBIT LEVEL
RUN
Iad2/Iad1>LEVEL Ibd2/Ibd1>LEVEL Icd2/Icd1>LEVEL
{
{
{
2
nd
harm
AND
AND
AND

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English