GE DIAC User manual

GEK 105570B


GE Power Management
DIAC DIFC DSFC
Digital Self Powered Overcurrent Protection
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1
TABLE OF CONTENTS
INTRODUCTION............................................................................................................. 3
PRODUCT DESCRIPTION............................................................................................. 4
G
ENERAL
...................................................................................................................... 4
A
PPLICATION
................................................................................................................. 4
F
UNCTIONS
................................................................................................................... 4
CALCULATION OF SETTINGS.................................................................................... 24
HARDWARE DESCRIPTION........................................................................................ 25
C
ASE
.......................................................................................................................... 25
A
DJUSTMENTS
............................................................................................................. 25
T
ARGETS
A
ND
I
NDICATORS
........................................................................................... 26
R
ESET
A
ND
M
ANUAL
T
RIP
............................................................................................ 26
T
RIP
C
IRCUIT
T
EST
...................................................................................................... 26
T
RIP
C
IRCUIT
............................................................................................................... 26
C
OVER
I
NSTALLATION
DIAC
AND
DSFC ........................................................................ 26
R
ECEIVING
, H
ANDLING
A
ND
S
TORAGE
........................................................................... 26
INSTALLATION ............................................................................................................ 27
E
NVIRONMENT
............................................................................................................. 27
M
OUNTING
.................................................................................................................. 27
S
URGE
G
ROUND
.......................................................................................................... 27
ACCEPTANCE TESTS................................................................................................. 34
V
ISUAL
I
NSPECTION
...................................................................................................... 34
M
ECHANICAL
I
NSPECTION
............................................................................................. 34
E
LECTRICAL
T
ESTS
...................................................................................................... 34
PERIODIC TESTS ........................................................................................................ 40
SERVICING .................................................................................................................. 40
SPECIFICATIONS ........................................................................................................ 44
R
ATINGS
..................................................................................................................... 45
B
URDENS
.................................................................................................................... 45
C
ONTACT
R
ATINGS
...................................................................................................... 45
E
NVIRONMENTAL
.......................................................................................................... 45
Cover Photo: 8919670

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2
LIST OF FIGURES
FIGURE 1 IAC51 TOC CURVES .............................................................................. 7
FIGURE 2 IAC53 TOC CURVES .............................................................................. 8
FIGURE 3 55 SHORT TIME TOC CURVES.............................................................. 9
FIGURE 4 57 MEDIUM TIME TOC CURVES .......................................................... 10
FIGURE 5 66 LONG TIME TOC CURVES .............................................................. 11
FIGURE 7 IAC77 TOC CURVES ............................................................................. 13
FIGURE 8 95 SHORT TIME TOC CURVES............................................................ 14
FIGURE 9 IEC INVERSE TOC CURVES ................................................................ 15
FIGURE 10 IEC VERY INVERSE TOC CURVES...................................................... 16
FIGURE 11 IEC EXTREMELY INVERSE TOC CURVES.......................................... 17
FIGURE 12 IEEE INVERSE TOC CURVES .............................................................. 18
FIGURE 13 IEEE VERY INVERSE TOC CURVES ................................................... 19
FIGURE 14 IEEE EXTREMELY INVERSE TOC CURVES ....................................... 20
FIGURE 15 DEFINITE TIME...................................................................................... 21
FIGURE 16 I
2
T TIME CURVE................................................................................... 22
FIGURE 16A IOC CURVE ........................................................................................... 23
FIGURE 18 DIAC AND DSFC EXTERNAL / INTERNAL CONNECTIONS................ 28
FIGURE 19 DIFC EXTERNAL / INTERNAL CONNECTIONS ................................... 29
FIGURE 20 DIAC PANEL MOUNTING AND DRILLING............................................ 30
FIGURE 21 DIFC PANEL MOUNTING AND DRILLING............................................ 31
FIGURE 21A SURFACE MOUNTING DIFC ................................................................ 32
FIGURE 22 DSFC PANEL MOUNTING AND DRILLING .......................................... 33
FIGURE 27 DIAC FRONT AND REAR VIEWS ......................................................... 41
FIGURE 28 DIFC FRONT AND REAR VIEWS.......................................................... 42
FIGURE 29 DSFC FRONT AND REAR VIEWS ........................................................ 43
FIGURE 30 BURDEN CURVE................................................................................... 44
These Instructions do not purport to cover all details or variations in
equipment nor provide for every possible contingency to be met in
connection with the installation, operation, or maintenance. Should
further information be desired or should particular problems arise
which are not covered sufficiently for the purchasers purpose, the
matter should be referred to the GENERAL ELECTRIC COMPANY. To
the extent required the product described herein meets applicable
ANSI, IEEE, NEMA, and IEC standards; but no assurances are given
with respect to local codes and ordinances because they vary greatly

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3
INTRODUCTION
Front View DIFC (8919654)
Features
·Digital single Phase overcurrent
protection
·General purpose feeder protection
·50 / 51 applications
·Self powered
·16 Selectable curves
·Reset curve enable/disable
·Low Burden
·Fully Retrofitable *
·Functional separate TOC & IOC
operations.
·Wide settings range.
·Drawout case construction
* When replacing unit and case (see instruction manual
INSTALLATION section for details).
51
52
50
Main
To Load

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4
PRODUCT DESCRIPTION
General
The DIAC, DIFC and DSFC are a family of
self-powered, single-phase, digital over-
current relays. The DIAC is packaged in a
GE S1 style case, the DIFC is packaged
in a GE C1 style case and the DSFC is
packaged in a GE V1 style case. See the
HARDWARE DESCRIPTION section for
mounting dimensions.
The table below gives the model number
breakdown.
D_ _CA _ _
B Revision
1 1 Amp Nominal Current
5 5 Amp Nominal Current
IF C1 case
IA S1 case
SF V1 case
These relays use waveform sampling of
the current input together with appropriate
algorithms to provide a time overcurrent
(TOC) and an instantaneous overcurrent
(IOC) function.
Application
Time and instantaneous overcurrent func-
tions are widely used in many applications
throughout the power system. Typical ex-
amples are protection of utility and indus-
trial feeders and short circuit and overload
protection for transformers, and motors.
For feeder protection, the usual applica-
tion requires one relay per phase and a
fourth relay connected in the residual cir-
cuit of three wye connected current
transformers (CTs). A typical external
connection diagram for this application is
shown in Figure 18 OR 19. Use of a
separate ground relay provides more sen-
sitive protection for ground faults.
The TOC reset characteristics can be set
to emulate those of an induction disk or
set for fast reset with no intentional delay.
Functions
The TOC function operates on an RMS
current calculated from the sampled val-
ues. The IOC function operates on the
sampled values, and the algorithm virtu-
ally eliminates the decaying DC offset
component to achieve low transient over-
reach of less than 7%.
The relays contain two independent set-
tings, one for TOC and one for IOC.
TOC
The TOC function provides 16 selectable
time current curves.
·IAC51
·IAC53
·55-SHORT TIME
·57-MEDIUM TIME
·66-LONG TIME
·75-SHORT TIME
·IAC77
·95-SHORT TIME
·IEC Inverse
·IEC Very Inverse

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5
·IEC Extremely Inverse
·IEEE Inverse
·IEEE Very Inverse
·IEEE Extremely Inverse
·Definite Time
·I
2
T
The IAC51, IAC53 and IAC77 curves
match the time current curve of the re-
spective IAC model. This includes the .5
through 9.9 time dial setting and for both
the 1 and 5 amp units. Numbered curves
55, 57, 66, 75, and 95 match the shape of
the respective IAC model however the
time dial positions are not one to one
equivalents. The IEC, IEEE and I
2
t curves
are based on the following equations:
Note
··································
IEC equations are defined by IEC 255-4
and IEEE equations are defined by IEEE
PC37.112
··································
M = multiple of pickup
TD = time dial ( 0.5, 1,  , 9.9 )
t = time ( seconds )
IEC Inverse
See Figure 9 for graph of equation
Reset time-
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
-
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
tTD
Pickup time
tTD
M
M
.
.
.
97
1
0 014
1
2
002
IEC Very Inverse
See Figure 10 for graph of equation
Reset time -
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
-
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
tTD
Pickup time
tTD
M
M
432
1
135
1
2
1
.
.
IEC Extremely Inverse
See Figure 11 for graph of equation
Reset time-
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
-
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
tTD
Pickup time
tTD
M
M
582
1
80
1
2
2
.
.

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6
IEEE Inverse
See Figure 12 for graph of equation
Reset time -
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
-
=-+
ì
í
ï
î
ï
ü
ý
ï
þ
ï
tTD
Pickup time
tTD
M
M
.
.
.
.
97
1
0103
100228
2
002
IEEE Very Inverse
See Figure 13 for graph of equation
Reset time -
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
-
=-+
ì
í
ï
î
ï
ü
ý
ï
þ
ï
tTD
Pickup time
tTD
M
M
432
1
3922
100982
2
2
.
..
IEEE Extremely Inverse
See Figure 14 for graph of equation
Reset time -
=-
ì
í
ï
î
ï
ü
ý
ï
þ
ï
-
=-+
ì
í
ï
î
ï
ü
ý
ï
þ
ï
tTD
Pickup time
tTD
M
M
582
1
564
10 02434
2
2
.
..
I
2
T
See Figure 16 for graph of equation
Re s et time
tTD
Pickup time
tTD
M
M
-
=
ì
í
ï
î
ï
ü
ý
ï
þ
ï
-
=
ì
í
ï
î
ï
ü
ý
ï
þ
ï
2
250
2
2

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7
0.1
2345567
1
234556
10
234556
100
0.1
2
3
4
5
66
7
1
2
3
4
5
66
7
10
2
3
4
5
66
7
100
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IAC 51
RESET OPERATE
.5
1
2
3
4
5
6
7
8
9
9.9
Time Dial Settings
Inverse Standard

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1104
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10023
FIGURE 1 IAC51 TOC Curve

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8
0.1
2345567
1
234556
10
234556
100
0.01
2
3
44
5
6
0.1
2
3
44
5
6
1
2
3
44
5
6
10
2
3
44
5
6
100
2
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IAC 53
RESET OPERATE
.5
1
2
3
4
5
6
78
9
Time Dial Settings
9.9
Very Inverse Standard

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1105
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10024
FIGURE 2 IAC53 TOC Curves

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9
0.1
2345567
1
234556
10
234556
100
0.01
2
3
4
5
66
7
0.1
2
3
4
5
66
7
1
2
3
4
5
66
7
10
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
55 - ST
RESET OPERATE
.5
1
2
3
4
5
6
7
8
9
9.9
Time Dial Settings
Short Time

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1106
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10025
FIGURE 3 55 Short Time TOC Curves

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10
0.1
2345567
1
234556
10
234556
100
0.1
2
3
4
5
66
7
1
2
3
4
5
66
7
10
2
3
4
5
66
7
100
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
57 - MT
RESET OPERATE
Time Dial Settings
.5
1
2
3
4
5
6
7
8
9
9.9
Inverse Medium

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1107
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10026
FIGURE 4 57 Medium Time TOC Curves

*(.%
11
0.1
2345567
1
234556
10
234556
100
0.1
2
3
4
55
6
1
2
3
4
55
6
10
2
3
4
55
6
100
2
3
4
55
6
1000
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
66 - LT
RESET OPERATE
Inverse Long
.5
1
2
3
Time Dial Settings
4
5
6
78
99.9

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1108
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10027
FIGURE 5 66 Long Time TOC Curves

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12
0.1
2345567
1
234556
10
234556
100
0.01
2
3
4
55
6
0.1
2
3
4
55
6
1
2
3
4
55
6
10
2
3
4
55
6
100
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
75 - ST
RESET OPERATE
Inverse Medium Short
.5
1
2
3
Time Dial Settings
4
5
6
78
99.9

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1109
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10028
FIGURE 6 75 Short Time TOC Curves

*(.%
13
0.1
2345567
1
234556
10
234556
100
0.01
2
3
44
5
6
0.1
2
3
44
5
6
1
2
3
44
5
6
10
2
3
44
5
6
100
2
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IAC 77
RESET OPERATE
Extremely Inverse Standard
.5
1
2
3
4
5
Time Dial Settings
6
7
9.9
98

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1110
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10029
FIGURE 7 IAC77 TOC Curves

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14
0.1
2345567
1
234556
10
234556
100
0.01
2
3
4
55
6
0.1
2
3
4
55
6
1
2
3
4
55
6
10
2
3
4
55
6
100
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
95 - ST
RESET OPERATE
Inverse Short
.5
1
2
3
4
5
Time Dial Settings
6
78
99.9

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1111
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10030
FIGURE 8 95 Short Time TOC Curves

*(.%
15
0.1
2345567
1
234556
10
234556
100
0.01
2
3
4
55
6
0.1
2
3
4
55
6
1
2
3
4
55
6
10
2
3
4
55
6
100
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IEC Inverse
RESET OPERATE
Time Dial Settings
3
2
1
.5
4
5
6
78
99.9

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1112
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10031
FIGURE 9 IEC Inverse TOC Curves

*(.%
16
0.1
2345567
1
234556
10
234556
100
0.01
2
3
44
5
6
0.1
2
3
44
5
6
1
2
3
44
5
6
10
2
3
44
5
6
100
2
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IEC VERY INVERSE
RESET OPERATE
.5
1
2
3
4
5
6
9.9
7
8
9
Time Dial Settings

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1113
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10032
FIGURE 10 IEC Very Inverse TOC Curves

*(.%
17
0.1
2345567
1
234556
10
234556
100
0.01
2
3
44
5
6
0.1
2
3
44
5
6
1
2
3
44
5
6
10
2
3
44
5
6
100
2
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IEC Ext. Inv.
RESET OPERATE
Extremely Inverse
.5
Time Dial Settings
9.9
98
7
6
5
4
3
2
1

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1114
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10033
FIGURE 11 IEC Extremely Inverse TOC Curves

*(.%
18
0.1
2345567
1
234556
10
234556
100
0.01
2
3
4
55
6
0.1
2
3
4
55
6
1
2
3
4
55
6
10
2
3
4
55
6
100
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IEEE Inverse
RESET OPERATE
Time Dial Settings
.5
1
2
3
4
5
6
78
99.9

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1115
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10034
FIGURE 12 IEEE Inverse TOC Curves

*(.%
19
0.1
2345567
1
234556
10
234556
100
0.01
2
3
44
5
6
0.1
2
3
44
5
6
1
2
3
44
5
6
10
2
3
44
5
6
100
2
DIAC, DIFC, & DSFC
OVERCURRENT RELAYS
IEEE Very Inv.
RESET OPERATE
Time Dial Settings
.5
1
2
3
4
5
6
78
99.9
Very Inverse

Frequency: 50/60 Hertz
0.1 - 3.18 (1 Ampere Relays)
General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355
0358A1116
Multiples of Pickup Setting
Time in Seconds
Time Dial Range: (0.5 - 9.9)
Current Range: 0.5 - 15.9 ( 5 Ampere Relays)
GES10035
FIGURE 13 IEEE Very Inverse TOC Curves