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ABB SA-1 Instruction Leaflet
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ABB SA-1 Instruction Leaflet

ABB SA-1 Instruction Leaflet

Generator differential relay
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Effective:
November 1997
Supersedes I.L. I.L. 41-348.1G, Dated January 1985
( | ) Denotes Change Since Previous Issue
CAUTION
!
Before putting relays into service, operate the
relay to check the electrical connections.
Close red handle switch last when placing
relay in service. Open red handle switch first
when removing relay from service.
1. APPLICATION
The SA-1 relay is a three-phase high-speed relay
used for differential protection of ac generators and
motors. With proper selection of current transformers,
the relay is unaffected by dc transients associated
with asymmetrical through short-circuit conditions.
Current transformer burden in ohms should not
exceed (N
V
)/133; further, the burden factor, BF,
P
CL
should not differ by more than a 2 to 1 ratio between
the two sets of ct's. The above terms are defined as:
N
=
proportion of total number of ct turns in
P
use
V
=
current transformer relaying accuracy
CL
class voltage (e.g. C400, V
R B
1000
B
=
--------------------- -
F
N P V CL
R
=
resistance of the burden, excluding ct
B
winding resistance
All possible contingencies which may arise during installation, operation or maintenance, and all details and
variations of this equipment do not purport to be covered by these instructions. If further information is desired
by purchaser regarding this particular installation, operation or maintenance of this equipment, the local ABB
Power T&D Company Inc. representative should be contacted.
ABB Automation, Inc.
Substation Automation & Protection Division
Coral Springs, FL
Allentown, PA
Generator Differential Relay
In calculating the burden, use the longest one-way
lead resistance from the ct to the SA-1 for distribution
transformer or resistance grounded machines. Use
twice the longest one-way lead resistance for reac-
tance grounded machines.
For example, if the 400/5 tap of a 600/5 multi-ratio ct
is used, N
rating, V
Assuming a resistance burden of R
burden factor, BF is:
The other set of ct's may than have a burden factor
as high as 2 x 3.8 = 7.6, or as low as 1/2 x 3.8 = 1.9.
If the other set of ct's also has a burden of 0.5 ohm, a
C100, C200, or C400 rating would be satisfactory
since the burden factors are 7.6, 3.8 and 1.9 respec-
tively.
= 400)
CL
2. CONSTRUCTION
The type SA-1 relay consists of a Restraint Circuit,
Operating Circuit, Sensing Circuit, Amplifier Circuit,
Trip Circuit, Indicating Circuit, Surge Protection Cir-
cuit and external reactors. The principal parts of the
relay and their location are shown in Figures 1
through 8.
Type SA-1
= 400/600 = 0.67. If this ct has a C200
P
= 200, and the burden should not exceed:
CL
N
V
×
0.67 200
P
CL
------------------- -
=
--------------------------- -
133
133
R
B
1000
1000 0.5
BF
=
-------------------- -
=
--------------------------- -
N P V CL
0.67 200
Instruction Leaflet
41-348.1H
1.0 ohm
=
= 0.5 ohms, the
B
×
=
3.8
×

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Summary of Contents for ABB SA-1

  • Page 1 If further information is desired by purchaser regarding this particular installation, operation or maintenance of this equipment, the local ABB Power T&D Company Inc. representative should be contacted.

  • Page 2: Operation

    3. OPERATION The amplifier circuit is connected to the sensing cir- The Type SA-1 relay is connected to the protected cuit such that it receives the difference in output of apparatus as shown in Figure 9. On external faults, the restraint filter and the operating filter.

  • Page 3: Installation

    The time curve of the relay is shown in Figure 15. Either a mounting stud or the mounting screws may be utilized for grounding the relay. The electrical The frequency response characteristic of the SA-1 connections may be made directly to the terminals relay is shown in Figure 16.

  • Page 4: Renewal Parts

    The indicator lamp should light when the relay amperes, apply 0.14 ±5% (0.5 ±5% got desensi- operates. tized SA-1) amperes operating current to each Repeat for each phase of the relay. operating circuit of the relay. The relay should operate and the indicator lamp should light.
  • Page 5 Type SA-1 41-348.1H Generator Differential Relay Table 1: (Values in Parenthesis Represent Desensitized SA-1) CHECKPOINTS (Typical Value) PRIMARY CIRCUIT CURRENT PHASE TERMINAL VALUE FUNCTION 0.14A 2 - 7 2.5 ac Input to operate rectifier Operating (0.5A) 3 - 6 2.5 ac Input to operate rectifier...
  • Page 6 Type SA-1 41-348.1H Generator Differential Relay Table 2: Electrical Part List Circuit Symbol Reference Style Resistors UT, UM, UB 60 Ohms, 25W 1875676 Resistors LT, LM, LB 265 Ohms, 25W 1725542 Resistors 1.8K, 40 W 187A321H06 Zener IN2986B 629A798H03 184A614H05...
  • Page 7 Type SA-1 41-348.1H Generator Differential Relay Figure 1. Type SA-1 Generator Differential Relay without Case (Front View)
  • Page 8 Type SA-1 41-348.1H Generator Differential Relay Figure 2. Type SA-1 Generator Differential Relay without Case (Rear View)
  • Page 9 Type SA-1 41-348.1H Generator Differential Relay 629A406 Sub 15 Figure 3. Internal Schematic of Type SA-1 Relay 48/125 Vdc...
  • Page 10 Type SA-1 41-348.1H Generator Differential Relay 876A613 Sub 9 Figure 4. Internal Schematic of Type SA-1 Relay 250 Vdc...
  • Page 11 Type SA-1 41-348.1H Generator Differential Relay 877A847 Sub 8 Figure 5. Internal Schematic of Desensitized SA-1 Relay...
  • Page 12 Type SA-1 41-348.1H Generator Differential Relay 762A601 Sub 9 Figure 6. Component Location for 48/125 Vdc...
  • Page 13 Type SA-1 41-348.1H Generator Differential Relay 867A639 * Sub 5 Figure 7. Component Location for 250 Vdc Denotes Change...
  • Page 14 Type SA-1 41-348.1H Generator Differential Relay COMPONENT LOCATION COMPONENT LOCATION 48/125 V 48/125 V C 12 C 12 R 15 R 15 1584C01G01 1584C01G01 C11 & C10 C11 & C10 .01 uf .01 uf 3516A36H03 3516A36H03 2.0 uf 2.0 uf...
  • Page 15 Type SA-1 41-348.1H Generator Differential Relay 775B965 *Sub 4 Figure 9. External Schematic of Type SA-1 Relay for Generator Protection 775B982 Sub 1 Figure 10. Reactor Outline...
  • Page 16 Type SA-1 41-348.1H Generator Differential Relay NOTE: A - PLACE IT. 1 TO 3 IN IT. 5 FOR SHIPPING PART STYLE ITEM NOTE ENG. NAME DWG. CODE REF. SCREW SIZE Lead LEAD 57Z0301 63-D-653 LEAD 57Z0401 63-D-655 3.00 .164 - 32 .164 - 32...
  • Page 17 Type SA-1 41-348.1H Generator Differential Relay 3537A44 Sub 2 Figure 12. Percentage Slope characteristic at Low Value of Restraint Current...
  • Page 18 Type SA-1 41-348.1H Generator Differential Relay 878A742 Sub 3 Figure 13. Percentage Slope Characteristic at High Value of Restraint Current...
  • Page 19 Type SA-1 41-348.1H Generator Differential Relay 619406 Sub 1 Figure 14. Percentage Slope Characteristic of High Value Restraint Current for Desensitized SA-1 Relay...
  • Page 20 Type SA-1 41-348.1H Generator Differential Relay 477706 Sub 1 Figure 15. Typical Operation Time Characteristic...
  • Page 21 Type SA-1 41-348.1H Generator Differential Relay 3537A45 Sub 2 Figure 16. Typical Frequency Response Curve 184A864 Sub 4 Figure 17. Typical Frequency Response Curve...
  • Page 22 Type SA-1 41-348.1H Generator Differential Relay 3519A69 * Sub 4 Figure 18. Outline and Drilling Plan for the Type SA-1 Relay in Type FT-32 Case Denotes Change...
  • Page 23 Type SA-1 41-348.1H Generator Differential Relay NOTES...
  • Page 24 Type SA-1 41-348.1H Generator Differential Relay ABB Automation, Inc. ABB Automation, Inc. Substation Automation & Protection Division Substation Automation & Protection Division 4300 Coral Ridge Drive 7036 Snowdrift Road, Suite 2 Coral Springs, FL 33065 Allentown, PA 18106 954 752-6700...