GE Multilin 489 User Manual

CHAPTER 7: TESTING
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 7–7
(EQ 7.3)
Therefore, the negative sequence current is 14% of FLA. The specification for negative-
sequence current accuracy is per output current inputs. Perform the steps below to verify
accuracy.
Z In the
S2 SYSTEM SETUP ZV GEN. PARAMETERS menu, set:
GENERATOR RATED MVA: “1.04”
VOLTAGE PHASE-PHASE: “600”
Note that setting VOLTAGE PHASE-PHASE to “600” is equivalent to setting FLA = 1000 A. This
is for testing purposes only!
Z In the
S2 SYSTEM SETUP Z CURRENT SENSING menu, set:
PHASE CT PRIMARY: “1000 A”
Z Inject the values shown in the table below and verify accuracy of the
measured values.
Z View the measured values in the
A2 METERING DATA Z CURRENT
METERING menu.
7.2.6 RTD Accuracy
The specification for RTD input accuracy is ±2° for Platinum/Nickel and ±5° for Copper.
Perform the steps below.
Z In the
S8 RTD TEMPERATURE MENU, set:
RTD TYPE Z STATOR RTD TYPE: “100 Ohm Platinum” (select desired type)
RTD #1 Z RTD #1 APPLICATION: “Stator” (repeat for RTDs 2 to 12)
Injected Current Expected Negative
Sequence Current
Measured Negative
Sequence Current
1 A Unit 5 A Unit
Ia = 0.78 A ∠0°
Ib = 1 A ∠113° lag
Ic = 1 A ∠247° lag
Ia = 3.9 A ∠0°
Ib = 5 A ∠113° lag
Ic = 5 A ∠247° lag
14% FLA
Ia = 1.56 A ∠0°
Ib = 2 A ∠113° lag
Ic = 2 A ∠247° lag
Ia = 7.8 A ∠0°
Ib = 10 A ∠113° lag
Ic = 10 A ∠247° lag
28% FLA
Ia = 0.39 A ∠0°
Ib = 0.5 A ∠113° lag
Ic = 0.5 A ∠247° lag
Ia = 1.95 A ∠0°
Ib = 2.5 A ∠113° lag
Ic = 2.5 A ∠247° lag
7% FLA
I
ns
1
3
---
I
a
a
2
I
b
aI
c
++() where a 1 120°∠ 0.5– j0.866+===
1
3
---
780 0°∠ 1 120°∠()
2
1000 113°–∠()1 120°∠()1000 113°∠()++()=
1
3
---
780 0°∠ 1000 127°∠ 1000 233°∠++()=
1
3
---
780 601.8– j798.6 601.8– j798.6–+()=
141.2–=
%I
ns
⇒
I
ns
FLA
---------
100× 14%==
Courtesy of NationalSwitchgear.com

GE Multilin 489 Specifications

General

Brand	GE
Model	Multilin 489
Category	Relays
Language	English