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ampere, nor greater than 1.2 amperes for the 1
ampere ICS. The current should not be greater than
the particular ICS setting being used for the 0.2-2.0
amperes ICS. The operation indicator target should
drop freely.
The contact gap should be approximately 0.047" for
the 0.2-2.0 ampere unit and 0.070" for the 1.0
ampere unit between the bridging moving contact
and the adjustable stationary contacts. The bridging
moving contact should touch both stationary contacts
simultaneously.
Figure
1
SDG-1T Relay without Case (Front View)
2
SDG-1T Relay without Case (Rear View)
3
SDG-2T Relay without Case (Front View)
4
SDG-2T Relay without Case (Rear View)
5
Detailed Internal Schematic of SDG-1T Relay with Parts List
6
Internal Diagram of Type SDG-2T
7
Detailed Internal Schematic of SDG-2T Relay with Parts List
8
SDG-4T Detailed Internal Schematic Relay with Parts List (Double Contact)
9
Test Connections for SDGT Line
10
Typical Operating Time Curves
11
Distance Phase and Distance Ground Relaying (External Connections)
12
Outline and Drilling Plan for SDGT Line Relays in an FT-42 Case
13
Compensator Construction
14
Impedance Circles for the SDG Line Relays
15
Test Points for SDGT – Line of Relays
15a
Test Points for SDGT – Line of Relays
16
Definition of Terms
17
Fault Resistance
18
Relay Voltages for AG Faults at Selected Points
19
Impedance Curve for the SDGT Line of Relays
20
SDGT-1T Component Location of Magnitude Comparator Board
21
SDGT-2T Component Location of Magnitude Comparator Board
22
SDGT-4T Component Location
23
SDG-1T-2T-4T component Location of Phase Splitter Rectifier Board
24
SDG-1T and SDG-2T 2φ-Ground Board Parts Component Location
25
SDG-1T Capacitor – Restraint Filter Board – Parts Location
26
SDG-2T Capacitor – Restraint Filter Board – Parts Location
8.
RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to the customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data, and component style num-
ber given in the electrical parts list.
See detailed Internal Schematics for printed circuit
styles and Reference Drawing list for component
location details.
Description
I.L. 41-496.52D
Drawing
PHOTO
PHOTO
PHOTO
PHOTO
6694D74
719B766
6694D77
1339D60
1495B95
9646A38
2396F25
57D7905
849A034
837A14, 15, 16
9646A39
9646A40
837A125
837A125
837A117
878A006
774B971
774B972
203C301
716B095
774B966
3507A85
3507A86
23
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