Cooper GWC Series Installation Instructions Manual
Sectionalizers
Type GWC
Installation Instructions
Applicable to serial number 1088 and above
Cooper Power Systems
Service Information
S270-21-1
Figure 1.
Kyle®Type GWC Sectionalizer.
Contents
Safety Information.................................................. 2
Hazard Statements.............................................. 2
Safety Instructions ............................................... 2
Additional Information.......................................... 2
Shipment and Acceptance..................................... 2
Handling and Storage ............................................ 2
General................................................................ 2
Control Battery Charging and Storage................. 3
Description.............................................................. 3
Ratings .................................................................... 3
Dimensions and Weights....................................... 4
Operating Controls................................................. 4
Remote Control Switch........................................ 4
115Vac - 5 amp Breaker Switch........................... 4
Manual Control Switch......................................... 4
One Count to Open Switch.................................. 5
Lamp Test Contact Position Switch ..................... 5
Battery Test Terminals ......................................... 5
Battery Load Test................................................. 5
Manual Trip Lever................................................ 5
Indicating Devices.................................................. 5
Settings ................................................................... 5
Minimum Actuating Current ................................. 6
Counts-to-Open ................................................... 6
Count Reset......................................................... 6
Count Restraint.................................................... 6
Inrush-Current Restraint ...................................... 6
Response Time.................................................... 6
88973KMA
Installation............................................................... 7
Preliminary Checks.............................................. 7
Lifting the Sectionalizer........................................ 7
Mounting the Sectionalizer .................................. 9
Mounting the Control ........................................... 9
Grounding the Control ......................................... 9
Control Cable....................................................... 9
Auxiliary Power....................................................... 9
Main Wiring.......................................................... 9
Interconnection Wiring Diagram...........................11
Interconnection Wiring Diagram, Control............12
Accessories ............................................................13
Auxiliary Switch....................................................13
Bushing-Type, Multi-Ratio Current Transformers 14
Operating Instructions...........................................14
Automatic Operation............................................14
Manual Electrical Operation.................................15
Manual Non-Electrical Operation.........................15
Control Battery .......................................................15
Battery Connections ............................................15
Battery Check ......................................................15
Testing.....................................................................16
Test Circuit and Equipment..................................16
Pre-Test Procedures............................................16
Test Procedures...................................................16
Post-Test Procedures ..........................................19
November 1991• Supersedes 12/88
Printed in USA
Type GWC Installation Instructions
SAFETY INFORMATION
Following is important safety information. For safe installation and operation of this equipment, be sure to read
and understand all cautions and warnings.
Hazard Statements
This manual contains two types of hazard statements:
WARNING: Refers to hazards or unsafe practices
!
which could result in severe personal injury, or
death, and equipment damage.
CAUTION: Refers to hazards or unsafe practices
!
which could result in damage to equipment or in
personal injury.
Safety Instructions
Following are general caution and warning statements
that apply to this equipment. Additional statements, related to specific tasks and procedures, are located throughout the manual.
WARNING: Before installing, operating, main-
!
taining, or testing this equipment, carefully read
and understand the contents of this manual. Improper
operation, handling or maintenance can result in death,
severe personal injury, and equipment damage. G101.0
WARNING: This equipment is not intended to
!
protect human life. Follow all locally approved procedures and safety practices when installing or operating
this equipment. Failure to comply may result in death,
severe personal injury and/or equipment damage. G102.0
WARNING: High voltage. Contact with high volt-
!
age will cause severe personal injury or death.
Follow all locally approved safety procedures when working around high voltage lines and equipment. G103.0
WARNING: Do not operate this equipment out
!
of oil. Oil is the electrical insulating medium within
this equipment; operation out of oil will result in
flashovers that will damage the equipment and may
cause severe personal injury. G104.0
WARNING: Follow all locally approved proce-
!
dures and safety practices when installing or
operating this equipment. Failure to comply may
result in death, severe personal injury, and/or equipment damage. G111.0
CAUTION: This equipment requires routine inspec-
!
tion and maintenance to ensure proper operation. If it
is not maintained it may fail to operate properly. Improper
operation may cause equipment damage and possible
personal injury. G105.0
CAUTION: Follow all locally approved safety
!
practices when lifting and mounting the equipment. Use the lifting lugs provided. Lift the load
smoothly and do not allow the load to shift. Improper
lifting may result in equipment damage. G106.0
CAUTION: Radiation. At voltages up to the
specified test voltages, the radiation emitted by
the vacuum interrupter is negligible. However, above
these voltages, radiation injurious to personnel may
be emitted. See
Vacuum Interrupter Radiation Warning
information. G109.0
Service Information S280-90-1,
, for further
Additional Information
These instructions do not claim to cover all details or
variations in the equipment, procedures, or process
described, nor to provide directions for meeting every
possible contingency during installation, operation, or
maintenance. When additional information is desired to
satisfy a problem not covered sufficiently for the user's
purpose, please contact your Cooper Power Systems
sales engineer.
SHIPMENT AND ACCEPTANCE
Each sectionalizer is completely assembled, inspected,
tested, and adjusted at the factory and is filled to the correct level with insulating oil. It is in good condition when
accepted by the carrier for shipment. Upon receipt of a
sectionalizer:
1. Inspect the sectionalizer thoroughly for damage and
loss of parts or oil incurred during shipment. If damage or loss is discovered, file a claim with the carrier
immediately.
2. Check for oil leakage and tighten all bolts that may
have been loosened during shipment, especially the
bolts attaching the head to the tank.
2
HANDLING AND STORAGE
General
If the sectionalizer is to be stored for an appreciable time
before installation, provide a clean, dry storage area.
Locate the sectionalizer so as to minimize the possibility of
mechanical damage. In particular, protect the bushings and
keep the operator cabinet closed to protect the electronic
control components.
S270-21-1
Control Battery Charging and Storage
The control battery is fully charged just prior to shipment and
is ready for use. However, storage for the length of time will
cause the battery to gradually lose its storage. Loss of
charge accelerates with increase in ambient temperature.
For trouble-free performance, it is highly recommended that
the battery be kept on trickle charge (approximately 15mA)
until the control is put into service, especially if it is to be in
transit and/or storage for more than 30 days. The battery can
tolerate a continuous trickle charge of 15mA indefinitely without damage.
Unless the battery is known to be fully charged, it is recommended that it be charged 50mA for 48 hours and then
maintained at 15mA until the control is out of service.
Like the control cabinet heater, the battery can be kept
charged by energizing the battery charger in the control with
120Vac applied to Terminals 5 and 6 of the input terminal
strip.
NOTE: When shipped from the factory, the battery is discon-
nected and the output plug is taped to the side of the
battery, Connect the battery plug into the mating receptacle below the battery to complete the battery circuit.
CAUTION: Electrical shock hazard. Be sure
!
the grounded side of the 120 Vac auxiliary
power circuit is connected to the terminal labeled
COMMON AC GND (usually terminal 5). A 120 Vac
short-to-ground will exist if the input connections are
reversed. Failure to comply could result in personal
injury and equipment damage. T219.0
If it is not convenient to apply 120Vac power to a stored
control, the battery can be removed from the control cabinet and charged on the bench with a dc source which
supplies approximately 15mA charging current to the battery. A dual-rate portable trickle charger, Catalog No.
KA1142ME3, is available for this purpose. It provides a
selectable output of either 15mA for maintaining a
charged battery. This unit plugs into a standard 120Vac
receptacle and has an output plug at the end of a 4-foot
cord which mates with the battery plug.
val of the backup device. For this reason, it must always be
used in series with a fault-interrupting backup protective
reclosing device. Also, it will reset counts that do not reach
the counts-to-open setting within the selected reset time
due to clearing of temporary faults.
A minimum of 0.5 amps of load current flowing through
the sectionalizer will block the generation of a count pulse.
This “count-restraint” feature prevents the sectionalizer
from counting overcurrents interrupted by down-line
devices.
The sectionalizers are also equipped with an inrush-current restraint feature which distinguishes between inrush
currents and fault currents. If it is determined that the overcurrent through the sectionalizer is inrush current, the
phase and ground current levels of the sectionalizer are
blocked for a duration of 3 seconds upon current detection.
Ratings
Tables 1 and 2 show rating information for the Type GWC
sectionalizer.
Table 1
Basic Sectionalizer Ratings
Type GWC
Nominal Voltage (kV)........................................................ 34.5
Rated Maximum Voltage (kV)........................................... 38.0
Impulse Withstand 1.2 x 5.0 microsecond wave
BIL (kV) .............................................................................. 150
60 hertz withstand
Dry, 1 minute (kV)............................................................ 70
Wet, 10 seconds (kV)...................................................... 60
Continuous Current Rating (amps) ....................................400
Rated symmetrical interrupting current (amps rms)........... 880
Rated making current, asymmetrical (amps rms) .......... 15000
DESCRIPTION
The sectionalizer is a self-contained, circuit-opening device
used in conjunction with source-side protective devices
such as reclosers or circuit breakers, to automatically isolate faulted sections of electrical distribution systems. The
sectionalizer senses current flow above a preset level, and
when the source-side protective device opens to de-energize the circuit, the sectionalizer counts the overcurrent
interruption. Depending upon the coordination scheme, the
sectionalizer will open during the first, second, and third
open interval of the fault interrupting device to isolate permanent faults and confine outages to smaller sections of
line.
The sectionalizer does not interrupt fault current but can
be closed into a faulted line. It opens during the open inter-
Short-time ratings (amps rms)
10-seconds symmetrical ............................................ 3500
1-second symmetrical................................................ 10000
Momentary maximum, asymmetrical (amps rms) .......... 15000
Table 2
Operating Data
Phase-minimum-actuating 16, 24, 40, 56, 80, 112, 160,
current (amps) 224, 256, 296, 320, 448, 480, 640
Ground-minimum-actuating 3.5, 7, 16, 20, 28, 40, 56, 80
current (amps) 112, 160, 224, 320, BLOCK
Number of counts to open 1, 2, 3
Count reset (seconds) 15, 30, 60, 90, 120, 180
3
Type GWC Installation Instructions
Dimensions and Weights
Figure 2 shows essential dimensional information for a
Type GWC sectionalizer, along with its weight and oil
capacity.
Operating Controls
The operating controls of the sectionalizer are located on
the front panel, within the control cabinet, as shown in
Figure 3.
Remote Control Switch
In the ON position, this switch permits the sectionalizer
to be operated by remotely located “dry” contacts which
are wired to a terminal block in the control cabinet.
Separate normally-open contacts are required for the
open and close operation.
In the OFF position, this switch disables remote control but
means of the control panel switches).
An extra set of contacts on this switch can provide
switch position information to the remote location.
does not
prevent automatic operations (by
115Vac - 5amp Breaker Switch
In the ON position, this switch energizes all 115Vac
power to the control cabinet and the operating housing
of the sectionalizer.
Manual Control Switch
While in the TRIP position, the sectionalizer main contacts are open and the closing circuit is disabled.
When placed in the CLOSE position, the sectionalizer
closing circuit is energized, the closing solenoid will be
momentarily energized and the sectionalizer will close.
Figure 2.
Type GWC Sectionalizer.
4
S270-21-1
One Count-to-Open Switch
When set to the ONE COUNT TO OPEN position, the sectionalizer will open on the completion of the first overcurrent count.
This feature provides added safety during downline hot-line
work. The operation of this switch also cancels out any accumulated memory time and resets the count to zero.
Lamp Test Contact Position Switch
When set to CONTACT POSITION, this momentary contact, center-off switch energizes the appropriate lamp to indicate the position of the main contacts in the sectionalizer;
green lamp indicates open, the red lamp indicates closed.
In the LAMP TEST position, both lamps are energized
to check their condition.
Battery Test Terminals
The battery test terminals enable convenient checking of
the battery voltage, charging rate and battery quiescent
drain current.
Battery Load Test
This switch is used in conjunction with the BATTERY TEST
TERMINALS. While checking battery voltage, pressing this
button connects a 10 ohm load resistor over the battery,
allowing measurement of loaded battery voltage.
Manual Trip Lever
In addition to the controls described above, a manually
operated trip lever is located on the underside of the
operator cabinet. Capable of being operated with a hookstick, this lever will mechanically trip the operating mechanism to open the sectionalizer.
Once pulled down, the lever stays down and disables the
closing circuit to block closing of the sectionalizer. The lever
must be returned manually to its “UP” position to re-activate
the closing circuit.
INDICATING DEVICES
In addition to the contact position indicator lamps on the control panel; a contact position indicator and an operations
counter are located under the sleet hood, on the mechanism
operator cabinet.
The yellow contact position indicator is pinned to the
main operating shaft of the sectionalizer to indicate the
OPEN and CLOSED condition of the main contacts.
The operations counter gives a visual indication of the
cumulative number of openings of the unit.
SETTINGS
The operating characteristics are preset to customer
specifications and tested prior to shipment from the factory. However, if the sectionalizer is relocated or the coordination scheme is modified, the operating characteristics
can be easily changed in the field. The settings should be
checked before the unit is put into service. All settings
are located on the printed circuit board mounted on the
control front panel. See Figure 3.
NOTE: Before changing the trip resistor settings, the section-
alizer must be bypassed and de-energized.
GROUND MINIMUM
ACTUATING CURRENT
RESISTOR
PHASE MINIMUM
ACTUATING CURRENT
RESISTOR
COUNT-TO-OPEN
SELECTOR
Figure 3.
Operator Control Panel.
COUNT RESET
SELECTOR
115VAC BREAKER
SWITCH
ONE-COUNT-TOOPEN SWITCH
REMOTE CONTROL
SWITCH
LAMP TEST, CONTACT
POSITION SWITCH
MANUAL CONTROL
SWITCH
BATTERY LOAD
TEST SWITCH
BATTERY TEST
TERMINALS
911042KMA
5
Type GWC Installation Instructions
Minimum Actuating Current
The minimum actuating current levels for both phase and ground
are determined by the selection of the proper plug-in resistors.
(Normally these settings are approximately 80 percent of the
minimum trip settings of the backup protective device.)
NOTE: If the backup device is not equipped for ground fault
sensing and tripping, the ground current sensing circuits of the sectionalizer can be de-activated by using
a shorting resistor labeled “BLOCK”.
Phase current resistors are identified with the phase symbol (ø) and the actuating current value in amps. Catalog
numbers for the available phase current resistors are listed
in Table 3.
Table 3
Minimum Actuating Resistor (Phase)
Label Value Resistance (ohms)
(amps) Minimum Maximum Catalog Number
16 264 270 KA176GV16
24 172 176 KA176GV24
40 94.3 96.3 KA176GV40
56 66.3 67.7 KA176GV56
80 47 48 KA176GV80
112 32.6 33.4 KA176GV112
160 22.9 23.5 KA176GV160
224 16.3 16.7 KA176GV224
256 13.8 14.2 KA176GV256
296 11.9 12.3 KA176GV296
320 11.1 11.5 KA176GV320
448 8.1 8.3 KA176GV448
480 7.4 7.6 KA176GV480
640 5.5 5.7 KA176GV640
Table 4
Minimum Actuating Resistor (Ground)
Label Value Resistance (ohms)
(amps) Minimum Maximum Catalog Number
3.5 6.91K 7.05K KA177GV3
7 1.168K 1.192K KA177GV7
16 379.0 387.0 KA177GV16
20 298.0 304.0 KA177GV20
28 200.0 204.0 KA177GV28
40 135.63 138.37 KA177GV40
56 94.3 96.3 KA177GV56
80 66.3 67.7 KA177GV80
112 47.0 48.0 KA177GV112
160 32.6 33.4 KA177GV160
224 22.9 23.5 KA177GV224
320 15.8 16.2 KA177GV320
BLOCK 0 0.1 KA177GVBLO
Ground current resistors are identified with the ground symbol ( ) and the actuating current value in amps. Catalog
numbers for the available ground current resistors are listed
in Table 4.
The minimum actuating current of the sectionalizer for
both phase and ground can be changed by merely
changing the appropriate plug-in resistor.
Counts-to-Open
The counts-to-open setting is determined by the position
of the COUNTS-TO-OPEN SELECTOR switch. Switch
positions 1, 2, and 3 correspond to 1, 2, or 3 counts to
open. Normally this setting is one less than the number
of operations to lockout of the backup protective device.
To change the number of counts-to-open setting, merely
change the position of the rotary switch.
Count Reset
The reset setting is determined by the position of the
COUNT RESET switch. Reset times of 15, 30, 60, 90,
120, and 180 seconds are available. This feature resets
to zero, and any accumulated counts are cancelled
whenever current, below the minimum actuation level,
flows through the sectionalizer without interruption for
longer than the time programmed.
The reset feature will operate with any current flow
from minimum load (5 amps) to values below phase or
ground pickup levels.
Count Restraint
The count-restraint feature blocks the sectionalizer from
generating a count pulse as long as 0.5 amps of load
current flows through the sectionalizer.
Inrush-Current Restraint
The inrush-current restraint feature blocks the phase
and ground actuating levels for three seconds after
current flow through the sectionalizer has been
restored and the overcurrent has been determined to
be inrush current.
The three-second time interval allows for system inrush
parameters to stabilize prior to allowing the sensitivity of
the sectionalizer to return to its programmed state.
Response Time
For backfed motor contribution and unsymmetrical clearing of upline faults, a response time is built into the sectionalizer control to eliminate unwanted counting of
these situations. Upon detection of any current above
the phase or ground actuating setting, the current must
exceed the response time characteristics as illustrated in
Figure 4. Total clearing time of reclosers and breakers
must exceed the response time characteristics of the
sectionalizer.
6
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