Table of Contents
Advertisement
Quick Links
Effective: February 1995
Supersedes I.L. 41-337.31A, Dated February 1983
(
) Denotes Change Since Previous Issue
!
Before putting relays into service, remove all
blocking which may have been inserted for
the purpose of securing the parts during
shipment, make sure that all moving parts
operate freely, inspect the contacts to see
that they are clean and close properly, and
operate the relay to check the settings and
electrical connections.
1.0
APPLICATION
These relays have been specially designed and
tested to establish their suitability for class 1E appli-
cations. Materials have been selected and tested to
insure that the relays will preform their intended func-
tion for their design life when operated in a normal
environment as defined by ANSI standard C37.90-
1978, when exposed to radiation levels up to 10
rads, and when subjected to seismic events produc-
ing a Shock Response Spectrum within the limits of
the relay rating.
"Class 1E" is the safety classification of the electric
equipment and systems in nuclear power generating
stations that are essential to emergency shutdown of
the reactor, containment isolation, cooling of the reac-
tor, and heat removal from the containment and reac-
tor, or otherwise are essential in preventing significant
release of radioactive material to the environment.
The current transformers should not saturate when
carrying the maximum external fault current. This
requirement is met if the burden impedance does not
exceed
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.
Printed in U.S.A.
Courtesy of NationalSwitchgear.com
ABB Automation Inc.
Substation Automation and Protection Division
Coral Springs, FL
CAUTION
Type CA-16
Percentage Differential
Relay for Bus Protection
Class 1E Applications
(
)R
N
V
–
I
–
100
e xt ·
P
CL
s
-------------------------------------------------------- -
(
)
1.33 I
ext
N
= proportion of total ct turns in use
P
V
= current transformer accuracy class C
CL
voltage
I
= maximum external fault current in secondary
ext
RMS amperes. (let I
fault current is less than 100A)
R
= current transformer secondary finding resis-
S
tance, ohms
For example, if the 400:5 tap of 800:5 C400 current
transformers are used, N
120A, R
= 1.0 ohm the burden should not exceed:
S
(
)
N
V
–
I
–
100R
P
CL
e xt.
S
---------------------------------------------------------- - =
(
)
1.33 I
ext.
(
)x1.0
4
0.5x400
–
120 100
–
---------------------------------------------------------------- -
1.33x120
The CA-16 relay should not be utilized for transformer
differential applications since it is too sensitive for
overriding the inrush. Likewise the CA-26 relay
should not be used for bus protection with the "four
circuit bus" connections of Figure 6.
2.0
CONSTRUCTION
The type CA-16 relay consists of an indicating con-
tactor switch, autotransformer, three restraint ele-
ments, an operating element, and a sensitive fault
detector.
The principal component parts of the relay and their
location are shown in Figures 1 to 3.
Instruction Leaflet
41-337.31B
where
= 100 if max. external
ext.
= 400/800 = 0.50, if I
P
ext.
=
1.13 ohms
=
Advertisement
Table of Contents
Related Manuals for ABB CA-26
Summary of Contents for ABB CA-26
- 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 41-337.31B Courtesy of NationalSwitchgear.com...
-
Page 3: Operation
41-337.31B 2.1. Restraint Elements The auto-transformer is designed to saturate at high values of current to limit the amount of current to the Each restraint element consists of an “E” laminated contactor switch. electromagnet with two primary coils and a second- 2.3.1. -
Page 4: Energy Requirements
41-337.31B required to close the relay contacts, expressed in 4.3. Connections percent of the total restraint current, varies with the 4.3.1. CA-16 magnitude of the restraint current. The relay sensi- tivity is high, corresponding to a low percentage To determine the ac connections, identify each pri- ratio, at light currents, and its sensitivity is low, cor- mary circuit as either a “source”... -
Page 5: Adjustments And Maintenance
41-337.31B For detail information on the FT case refer to IL 41- 6.2. Routine Maintenance 076 for semi-flush mounting. All contacts should be periodically cleaned. A contact burnisher recommended this purpose. ADJUSTMENTS AND MAINTENANCE (S#182A836H01). The use of abrasive material for The proper adjustments to insure correct operation of cleaning contacts is not recommended, because of this relay have been made at the factory. -
Page 6: Renewal Parts
41-337.31B (Viewed from top of switch between cover and frame). core screw slowly. This causes the plunger to move This can be done by loosening the mounting screw in up, compressing the spring until a point of maximum the molded pedestal and moving the ICS in the down- deflection is reached. - Page 7 41-337.31B This Page Reserved for Notes Courtesy of NationalSwitchgear.com...
- Page 8 41-337.31B Sub 1 3532A95 Figure 3. Internal Schematic of the Type CA-16 Bus Relay Courtesy of NationalSwitchgear.com...
- Page 9 41-337.31B Courtesy of NationalSwitchgear.com...
- Page 10 41-337.31B Courtesy of NationalSwitchgear.com...
- Page 11 41-337.31B Sub 5 187A424 Figure 6. External Schematic of One Set of Type CA-16 Relays for the Protection of a Three and Four Circuit Bus Courtesy of NationalSwitchgear.com...
- Page 12 41-337.31B Sub 5 187A425 Figure 7. External Schematic of the Type CA-16 Relays for Protection of Six Circuit Bus with Three Feeder Groups Courtesy of NationalSwitchgear.com...
- Page 13 41-337.31B Courtesy of NationalSwitchgear.com...
- Page 14 41-337.31B Sub 1 849A450 Figure 9. Percentage Slope Curve of the CA-16 Relay with One Restraint Winding Courtesy of NationalSwitchgear.com...
- Page 15 41-337.31B Sub 2 849A343 Figure 10. Percentage Slope Curve of the CA-16 Relay with Six Restraint Windings in Series Courtesy of NationalSwitchgear.com...
- Page 16 41-337.31B Sub 1 3519A69 Figure 11. Outline and Drilling for the CA-16 Relay in FT-32 Case ABB Automation Inc. 4300 Coral Ridge Drive Coral Springs Florida 33065 TEL: 954-752-6700 FAX: 954-345-5329 visit our website at www.abbus.com/papd Printed in U.S.A. Courtesy of NationalSwitchgear.com...