GE DIAC 66K User manual

DIAC Type 66K
DIGITAL OVERCURRENT RELAY
Instruction Manual
DIAC 66K Revision: SPDV130.A03
Manual P/N: GEK-106261C
Copyright © 2000 GE Power Management
GE Power Management
215 Anderson Avenue, Markham, Ontario
Canada L6E 1B3
Tel: [phone] Fax: [phone]
Internet: http://www.GEindustrial.com/pm Manufactured under an
ISO9002 Registered system.
g
GE Power Managemen
t

These instructions do not purport to cover all details or variations in equipment nor provide for every possibl
e
contingency to be met in connection with installation, operation, or maintenance. Should further information b
e
desired or should particular problems arise which are not covered sufficiently for the purchaser’s purpose, th
e
matter should be referred to the General Electric Company.
To the extent required the products described herein meet applicable ANSI, IEEE, and NEMA standards; bu
t
no such assurance is given with respect to local codes and ordinances because they vary greatly.

GE Power Management DIAC Type 66K Digital Overcurrent Relay
i
TABLE OF CONTENTS
1. INTRODUCTION 1.1 FEATURES................................................................................................ 1-1
1.2 ORDER CODES........................................................................................ 1-2
2. PRODUCT DESCRIPTION 2.1 GENERAL.................................................................................................. 2-1
2.2 APPLICATION........................................................................................... 2-1
2.3 RATINGS................................................................................................... 2-2
2.4 TOC FUNCTIONS ..................................................................................... 2-2
3. CALCULATION OF
SETTINGS 3.1 DESCRIPTION .......................................................................................... 3-1
4. HARDWARE
DESCRIPTION 4.1 CASE......................................................................................................... 4-1
4.2 ADJUSTMENTS: DIGITAL UNITS............................................................. 4-1
4.3 ADJUSTMENTS: STANDARD INSTANTANEOUS UNIT.......................... 4-1
4.4 TARGETS AND INDICATORS .................................................................. 4-2
4.5 RESET TARGETS..................................................................................... 4-3
4.6 MANUAL TRIP CIRCUIT TEST................................................................. 4-3
4.7 TRIP CIRCUIT........................................................................................... 4-3
4.8 DIAC 66K COVER INSTALLATION........................................................... 4-3
4.9 RECEIVING, HANDLING, AND STORAGE ..............................................4-3
4.10 TARGET AND SEAL-IN UNIT ................................................................... 4-3
5. INSTALLATION 5.1 ENVIRONMENT ........................................................................................ 5-1
5.2 MOUNTING ............................................................................................... 5-1
5.3 SURGE GROUND..................................................................................... 5-1
5.4 INTERNAL/EXTERNAL CONNECTIONS.................................................. 5-2
5.5 PANEL MOUNTING AND DRILLING ........................................................ 5-5
5.6 MOTOR PROTECTION CHARACTERISTIC CURVE...............................5-6
6. ACCEPTANCE/PERIODIC
TESTS 6.1 DESCRIPTION .......................................................................................... 6-1
6.2 VISUAL INSPECTION............................................................................... 6-1
6.3 MECHANICAL INSPECTION .................................................................... 6-1
6.4 DRAWOUT RELAYS, GENERAL.............................................................. 6-1
6.5 TOC ALARM UNIT..................................................................................... 6-2
a PICKUP VERIFICATION ........................................................................ 6-2
b VERIFICATION OF OPERATING TIME................................................. 6-2
6.6 TOC / INSTANTANEOUS HDO UNIT – INVERSE TIME..........................6-3
a PICKUP VERIFICATION ........................................................................ 6-3
b VERIFICATION OF OPERATING TIME................................................. 6-4
6.7 TOC / INSTANTANEOUS HDO UNIT – DEFINITE TIME ......................... 6-4
a VERIFICATION OF TIME DIAL.............................................................. 6-4
6.8 INSTANTANEOUS HDO UNIT.................................................................. 6-5
6.9 STANDARD INSTANTANEOUS UNIT ...................................................... 6-6
6.10 PERIODIC TESTS..................................................................................... 6-7
6.11 SERVICING............................................................................................... 6-7

ii
DIAC Type 66K Digital Overcurrent Relay GE Power Management
TABLE OF CONTENTS
7. SPECIFICATIONS 7.1 BURDENS ................................................................................................. 7-1
7.2 RATINGS................................................................................................... 7-2
7.3 ENVIRONMENTAL.................................................................................... 7-2

GE Power Management DIAC Type 66K Digital Overcurrent Relay 1-
1
GEK-106621 1 INTRODUCTION
1
GEK-106621 1 INTRODUCTION 1.1 FEATURES
Figure 1–1: FRONT VIEW OF THE DIAC TYPE 66K RELAY
The DIAC Type 66K Digital Overcurrent Relay includes the following features:
• Digital single Phase overcurrent protection
• General purpose feeder protection
• 50 / 51 applications & Motor Protection
• Self powered
• 9 Selectable curves †
• Reset curve enable/disable
• Low Burden
• Fully Retrofittable
• Functional separate TOC/IOC, TOC alarm & Standard (EM) IOC operations.
• Wide settings range
• Drawout case construction
† The 66LT curve is used by this relay.

1-
2
DIAC Type 66K Digital Overcurrent Relay GE Power Management
1 INTRODUCTION GEK-106621
1
Figure 1–2: FUNCTIONAL BLOCK DIAGRAM
1.2 ORDER CODES
Table 1–1: ORDER CODES FOR THE DIAC TYPE 66K RELAY
DIAC


* *
Base Unit DIAC ||| Base Unit – Digital Overcurrent Component Relay, “S1 Case”
Configuration B| | One TOC/IOC target & seal-in; 1 TOC alarm output (max. current to 1 A); 1 standard hi-set IOC EM dual range
target relay (2 to 16 A); time dial 0.1 to 9.9 sec., 50 & 60 Hz with instantaneous or timed reset plus IOC delay.
Duplicates the IAC 66K function.
C| | Same as ‘B’ except one 1 standard hi-set dual range target relay unit (10 to 80 A)
D| | Same as ‘B’ except one 1 standard hi-set dual range target relay unit (20 to 160 A)
Current Rating 1|1 Amp Nominal Current
5|5 Amp Nominal Current
Revision Level BRevision Level
BLOCKDGM.CDR
52
CTs
MAIN BUSMAIN BUS
DIAC
Type 66K
50
51

GE Power Management DIAC Type 66K Digital Overcurrent Relay 2-
1
GEK-106261 2 PRODUCT DESCRIPTION
2
GEK-106261 2 PRODUCT DESCRIPTION 2.1 GENERAL
The DIAC is a self-powered, single-phase, digital overcurrent relay. This digital overcurrent relay is sometimes
referred to as the ‘Type 66K relay’, as it was designed to replace the IAC66K Motor Protection relay. The Type
66K relays are single-phase, current operated AC devices designed for motor protection. They utilize 16
selectable time-current characteristics (shown on pages 2–3 to 2–18).
Each relay consists of a time overcurrent unit, a dual-rated target seal-in unit, and a hinge-type instantaneous
overcurrent unit. The available ranges in amperes of these units, as well as information on their continuous rat-
ing, contact rating, and top ratings are given in Section 2.3: RATINGS.
The DIAC 66K is packaged in a GE S1 style case. See Figure 5–4: DIAC PANEL MOUNTING AND DRILLING
on page 5–5 section for mounting dimensions. The internal connections are shown in Figure 5–1: DIAC TYPE
66K INTERNAL/EXTERNAL CONNECTIONS on page 5–2. The DIAC 66K uses waveform sampling of the
current input together with appropriate algorithms to provide time overcurrent (TOC) and instantaneous over-
current (IOC) functions.
2.2 APPLICATION
The DIAC Type 66K is especially suited for motor protection. The relay contains an electronic (IOC) high drop-
out instantaneous unit to discriminate between motor-running overload and locked-rotor current. This is
accomplished by setting pickup of the high dropout unit (50/B) between motor full-load current and locked-rotor
current as illustrated in Figure 5–5: MOTOR PROTECTION CHARACTERISTIC CURVE on page 5–6, with the
normal (EM) dropout instantaneous unit (50/A) set above locked-rotor current. The TOC reset characteristics
can emulate those of an induction disk or set for fast reset with no intentional delay. The time overcurrent unit
must coordinate with the motor thermal limit. Typical settings to accomplish this are listed in the table below:
The user must determine the specific settings which will provide the required protection for his machine, and
select a relay model having the operating ranges needed to obtain these settings.
With settings as illustrated in Figure 5–5: MOTOR PROTECTION CHARACTERISTIC CURVE on page 5–6
and external connections shown in Figure 5–3: TYPICAL EXTERNAL CONNNECTIONS FOR MOTOR PRO-
TECTION on page 5–4, the operation of the DIAC66K relay will be as follows:
• For motor overloads, the time overcurrent unit (51) will time out, picking up an external auxiliary 51X, which
sounds an alarm (Stud # 2).
• For the locked-rotor condition, the high-dropout unit (50/B) will pick up instantaneously and the TOC (51)
will pick up with a time delay consistent with the motor thermal limit. When both units have operated, the
breaker will be tripped (Stud 10).
• For a fault, the (EM) normal dropout instantaneous unit (50/A) will pick up instantaneously and trip the
breaker (Stud 3).
NOTE: The relay can also be used by setting the Instantaneous HDO setting switch to the lowest set-
ting, not including 0. This will allow the Instantaneous HDO unit to pickup at 0.1 A or 0.5 A, thus
enabling TOC to operate independently using stud 10. Use stud 3 as the Standard High Set IOC.
Table 2–1: DIAC 66K SETTING RANGE
UNIT / FUNCTION PICKUP SETTING (multiples
of nominal current 1A/5A)
Time Overcurrent Unit 51 1.5 to 40
Normal Dropout Instantaneous Overcurrent Unit 50/A 8 to 15
High Dropout Instantaneous Overcurrent Unit 50/B 1.1 to 10

2-
2
DIAC Type 66K Digital Overcurrent Relay GE Power Management
2 PRODUCT DESCRIPTION GEK-106261
2
2.3 RATINGS
2.4 TOC FUNCTIONS
The TOC function operates on an ‘RMS’ current calculated from the sampled values. The IOC function oper-
ates on the sampled values, and the algorithm virtually eliminates the decaying DC offset component to
achieve low transient overreach of less than 7%.
The relays contain two independent settings: one for TOC and one for IOC. These two settings control the
TOC/Instantaneous function of Stud 10. The TOC/Instantaneous units operate in series with each other as in
the Application Diagram shown in Figure 5–3: TYPICAL EXTERNAL CONNNECTIONS FOR MOTOR PRO-
TECTION on page 5–4.
The TOC function provides 16 selectable time current curves:
The IAC51, IAC53, and IAC77 curves match the time current curve of the respective IAC model. This includes
the 0.5 through 9.9 time dial setting for the 1 and 5 A 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 I2t curves are based on the equations listed with the corresponding curves on pages 2–11 to 2–18.
The I2t curve has a K value equal to the time dial times 250. The minimum value of K is 25 (0.1 ×250) and the
maximum value is 2475 (9.9 ×250).
NOTE: IEC equations are defined by IEC 255-4 and IEEE equations are defined by IEEE PC37.112
Table 2–2: RATINGS OF TARGET AND SEAL-IN COIL
CURRENT
OPERATED UNITS DUAL-RATED AMP
0.2 AMP TAP 2.0 AMP TAP
Carry 30 amps for (seconds) 0.05 2.2
Carry 10 amps for (seconds) 0.45 2.0
Carry continuously (amperes) 0.37 2.3
Minimum operating (amperes) 0.2 2.0
Minimum dropout (amperes) 0.05 0.5
DC resistance (ohms) 8.3 0.24
60 hertz impedance (ohms) 50 0.65
50 hertz impedance (ohms) 42 0.54
•IAC51 •IEC Inverse
•IAC53 •IEC Very Inverse
•55-SHORT TIME •IEC Extremely Inverse
•57-MEDIUM TIME •IEEE Inverse
•66-LONG TIME (DIAC Type 66K) •IEEE Very Inverse
•75-SHORT TIME •IEEE Extremely Inverse
•IAC77 •Definite Time
•95-SHORT TIME •I2T

GE Power Management DIAC Type 66K Digital Overcurrent Relay 2-
3
GEK-106261 2 PRODUCT DESCRIPTION
2
Figure 2–1: IAC51 TOC CURVE
0.1 2345567 1234556 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
RESET OPERATE
.5
1
2
3
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
Time in Seconds
TIME DIAL SETTINGS
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)

2-
4
DIAC Type 66K Digital Overcurrent Relay GE Power Management
2 PRODUCT DESCRIPTION GEK-106261
2
Figure 2–2: IAC53 TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
0.5
1
2
3
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
TIME DIAL SETTINGS
Time in Seconds
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)

GE Power Management DIAC Type 66K Digital Overcurrent Relay 2-
5
GEK-106261 2 PRODUCT DESCRIPTION
2
Figure 2–3: 55 SHORT TIME TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
0.5
1
2
3
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)
Time in Seconds
TIME DIAL SETTINGS

2-
6
DIAC Type 66K Digital Overcurrent Relay GE Power Management
2 PRODUCT DESCRIPTION GEK-106261
2
Figure 2–4: 57 MEDIUM TIME TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
.5
1
2
3
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)
TIME DIAL SETTINGS

GE Power Management DIAC Type 66K Digital Overcurrent Relay 2-
7
GEK-106261 2 PRODUCT DESCRIPTION
2
Figure 2–5: 66 LONG TIME TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
0.5
1
2
3
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
Time in Seconds
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)
TIME DIAL SETTINGS

2-
8
DIAC Type 66K Digital Overcurrent Relay GE Power Management
2 PRODUCT DESCRIPTION GEK-106261
2
Figure 2–6: 75 SHORT TIME TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
0.5
1
2
3
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
Time in Seconds
TIME DIAL SETTINGS
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)

GE Power Management DIAC Type 66K Digital Overcurrent Relay 2-
9
GEK-106261 2 PRODUCT DESCRIPTION
2
Figure 2–7: IAC77 TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
0.5
1
2
3
4
5
6
7
9.9
9
8
Multiples of Pickup Setting
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)
TIME DIAL SETTINGS
Time in Seconds

2-
10
DIAC Type 66K Digital Overcurrent Relay GE Power Management
2 PRODUCT DESCRIPTION GEK-106261
2
Figure 2–8: 95 SHORT TIME TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
0.5
1
2
3
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)
Time in Seconds
TIME DIAL SETTINGS

GE Power Management DIAC Type 66K Digital Overcurrent Relay 2-
11
GEK-106261 2 PRODUCT DESCRIPTION
2
RESET TIME: ; PICKUP TIME:
Figure 2–9: IEC INVERSE TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
3
2
1
0.5
4
5
6
7
8
9
9.9
Multiples of Pickup Setting
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)
Time in Seconds
TIME DIAL SETTINGS
tTD
0.97
M
21–
------------------


⋅=
tTD
0.014
M
0.02
1
–
------------------------


⋅=

2-
12
DIAC Type 66K Digital Overcurrent Relay GE Power Management
2 PRODUCT DESCRIPTION GEK-106261
2
RESET TIME: ; PICKUP TIME:
Figure 2–10: IEC VERY INVERSE TOC CURVES
0.1 2345567 1234556 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
RESET OPERATE
0.5
1
2
3
4
5
6
9.9
7
8
9
Multiples of Pickup Setting
0.1 to 3.18 A (1 Amp Relays)
Current Range: 0.5 to 15.9 A (5 Amp Relays)
Time in Seconds
TIME DIAL SETTINGS
tTD
4.32
M
21–
------------------


⋅=
tTD
1.35
M
1
–
--------------


⋅=