GE 469 User Manual

CHAPTER 7: TESTING
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 7–13
(EQ 7.2)
Given the values in the figure above, we have:
(EQ 7.3)
If FLA = 1000, then:
(EQ 7.4)
and since , the 469 unbalance is:
(EQ 7.5)
The 469 specification for unbalance accuracy is ±2%. Perform the steps below to verify
accuracy.
Z Alter the following settings:
S2 SYSTEM SETUP Z CURRENT SENSING Z PHASE CT PRIMARY: “1000 A”
S2 SYSTEM SETUP Z CURRENT SENSING ZV MOTOR FULL LOAD AMPS FLA: “1000 A”
Z Inject the values shown in the table below.
Z Verify accuracy of the measured values.
Z View the measured values in:
A2 METERING DATA Z CURRENT METERING
7.3.4 Voltage Phase Reversal Test
The 469 can detect voltage phase rotation and protect against phase reversal. To test the
phase reversal element, perform the following steps:
Z Alter the following settings:
INJECTED CURRENT EXPECTED
UNBALANCE
LEVEL
MEASURED
UNBALANCE
LEVEL
1 A UNIT 5 A UNIT
Ia = 0.78 A ∠0°
Ib = 1 A ∠113°
Ic = 1 A ∠247°
Ia = 3.9 A ∠0°
Ib = 5 A ∠113°
Ic = 5 A ∠247°
14%
Ia = 1.56 A ∠0°
Ib = 2 A ∠247°
Ic = 2 A ∠113°
Ia = 7.8 A ∠0°
Ib = 10 A ∠247°
Ic = 10 A ∠113°
15%
Ia = 0.39 A ∠0°
Ib = 0.5 A ∠247°
Ic = 0.5 A ∠113°
Ia = 1.95 A ∠0°
Ib = 2.5 A ∠247°
Ic = 2.5 A ∠113°
7%
I
2
I
1
----
1
3
---
I
a
a
2
I
b
aI
c
++()
1
3
---
I
a
aI
b
a
2
I
c
++()
-------------------------------------------= where a 1 120°∠ 0.5– j0.886+==
I
2
I
1
----
780 0°∠ 1 120°∠()
2
1000 113°–∠()1120°∠()1000 113°∠()++
780 0°∠ 1 120°∠()1000 113°–∠()1 120°∠()
2
1000 113°∠()++
----------------------------------------------------------------------------------------------------------------------------------------------------------------=
780 0°∠ 1000 127°∠ 1000 233°∠++
780 0°∠ 1000 7°∠ 1000 353°∠++
---------------------------------------------------------------------------------------------=
780 601.8– j798.6 601.8– j798.6–+
780 992.5 j121.9 992.5 j121.9–++ +
---------------------------------------------------------------------------------------------
423.6–
2765
-----------------== 0.1532=
I
avg
780 1000 1000++
3
-----------------------------------------------
A 926.7 A==
I
avg
926.7 A 1000< FLA==
469 Unbalance 0.1532–
926.7
1000
-------------
100%×× 14.2%==

GE 469 Specifications

General

Brand	GE
Model	469
Category	Relays
Language	English