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7–12
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 7: TESTING
S2 SYSTEM SETUP
Z
CURRENT SENSING
Z
PHASE CT PRIMARY:
“1000”
S2 SYSTEM SETUP
ZV
VOLTAGE SENSING
Z
VT CONNECTION TYPE:
“Wye”
S2 SYSTEM SETUP
ZV
VOLTAGE SENSING
ZV
VOLTAGE TRANSFORMER RATIO:
“10.00:1”
Z
Inject current and apply voltage as per the table below.
Z
Verify accuracy of the measured values.
Z
View the measured values in:
A2 METERING DATA
ZV
POWER METERING
.
7.3.3
Unbalance Test
The 469 measures the ratio of negative sequence current (
I
2
) to positive sequence current
(
I
1
). This value as a percent is used as the unbalance level when motor load exceeds FLA.
When the average phase current is below FLA, the unbalance value is de-rated to prevent
nuisance tripping as positive sequence current is much smaller and negative sequence
current remains relatively constant. The derating formula is:
(EQ 7.1)
FIGURE 7–2: Three Phase Example for Unbalance Calculation
Symmetrical component analysis of vectors using the mathematical vector convention
yields a ratio of negative sequence current to positive sequence current as shown:
INJECTED
CURRENT 1A
UNIT, APPLIED
VOLTAGE (Ia is the
reference vector)
INJECTED
CURRENT 5A
UNIT, APPLIED
VOLTAGE (Ia is the
reference vector)
EXPECTE
D LEVEL
OF
POWER
QUANTIT
Y
TOLERAN
CE RANGE
OF POWER
QUANTITY
MEASURE
D POWER
QUANTIT
Y
EXPECT
ED
POWER
FACTOR
MEASURE
D POWER
FACTOR
Ia = 1 A
∠
0
°
Ib = 1 A
∠
120
°
Ic = 1 A
∠
240
°
Va = 120 V
∠
342
°
Vb = 120 V
∠
102
°
Vc = 120 V
∠
222
°
Ia = 5 A
∠
0
°
Ib = 5 A
∠
120
°
Ic = 5 A
∠
240
°
Ia = 120 V
∠
342
°
Vb = 120 V
∠
102
°
Vc = 120 V
∠
222
°
+ 3424 kW
3329
to
3519
kW
0.95 lag
Ia = 1 A
∠
0
°
Ib = 1 A
∠
120
°
Ic = 1 A
∠
240
°
Va = 120 V
∠
288
°
Vb = 120 V
∠
48
°
Vc = 120 V
∠
168
°
Ia = 5 A
∠
0
°
Ib = 5 A
∠
120
°
Ic = 5 A
∠
240
°
Va = 120 V
∠
288
°
Vb = 120 V
∠
48
°
Vc = 120 V
∠
168
°
+ 3424
kvar
3329
to
3519
kvar
0.31 lag
I
2
I
1
----
I
avg
FLA
---------
100%
×
×
I
a
=
780
A
@
0°
I
b
=
1000
A
@
113°
I
c
=
1000
A
@
2
4
7°
I
a
=
780
A
@
0°
I
b
=
1000
A
@ -
113°
I
c
=
1000
A
@
113°
POW
E
R S
Y
ST
E
M
V
E
CT
O
R
C
O
N
V
EN
T
I
O
N
M
A
T
HE
M
A
T
I
C
A
L
V
E
CT
O
R
C
O
N
V
EN
T
I
O
N
Summary of Contents for 469
Page 62: ...2 16 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 2 INTRODUCTION ...
Page 90: ...3 28 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 3 INSTALLATION ...
Page 292: ...6 42 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 6 ACTUAL VALUES ...
Page 313: ...A APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL A 7 HGF5C 808841A1 HGF8 808842A1 ...
Page 315: ...A APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL A 9 808712A1 CDR ...
Page 320: ...A 14 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL A APPENDIX ...