GE STD16C - Page 2

GEK-45307
DESCRIPTION
3
APPLICATION
3
CALCULATION
OF
SETTINGS
5
Method
5
Current
Transformer
Connections
5
Determination
of
CT
Turns
and
Type
STD
Relay
Tap
Setting
5
Current Transformer
Ratio
Error
6
Percent
Slope
Setting
8
I
Determination
of
CT
Turns
and
STD
Relay
Tap
Setting
8
II Percent
Ratio
Error
9
IA
Repeat
-
CT
Turns
and
Relay
Tap
Setting
9
hA
Repeat
-
Percent
Ratio
Error
10
III
Percent
Slope
Setting
10
RATINGS
10
Models
12STD15B
and
12STD16B
10
Auxiliary
Relay
Control
Circuit
11
CHARACTERISTICS
ii
Pickup
and
Operating
Time
11
Overcurrent
Unit
Pickup
11
Percentage
Differential
Characteristics
12
Harmonic
Restraint
Characteristics
12
BURDENS
13
CONSTRUCTION
14
Current
Transformers
14
Through—Current
Restraint
Circuit
14
Differential-Current
Circuit
15
Overcurrent
Unit
15
Main
Operating
Unit
16
Target
and
Seal-in
Unit
16
Case
16
RECEIVING,
HANDLING
AND
STORAGE
17
ACCEPTANCE
TESTS
17
Visual
Inspection
17
Mechanical
Inspection
17
Electrical
Tests
17
Test
Equipment
18
INSTALLATION
PROCEDURE
18
Tests
18
Pickup
19
Harmonic
Current
Restraint
19
Through-Current
Restraint
20
Instantaneous
Overcurrent
Unit
21
Dropout
of
Main
Unit
21
Location
21
Mounting
21
Connections
21
ADJUSTMENTS
21
Tap
Plug Positioning
21
Percent
Slope
Setting
23
OPERATION
23
Targets
23
Disabling
of
Type
STD
Relay
23
MAINTENANCE
23
Contact
Cleaning
23
PERIODIC
TESTS
24
Pickup
24
Harmonic
Current
Restraint
24
Through-Current
Restraint
25
SERVICING
25
RENEWAL
PARTS
26
2