Cooper Power Systems GH Technical specifications

Figure 1
Type GH single-phase sectionalizer.
These instructions do not claim to cover all details or variations in the equipment, procedure, or process described, nor to provide direction for meet-
ing 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.
March 1976 ●New Issue
Sectionalizers Service Information
S270-10-6
Type GH (Form 2)
Maintenance Instructions
1
Applies toType GH (Form 2) single-phase, hydraulically controlled sectionalizers above serial number 35700.
ForType GH (Form 1) sectionalizers below serial number 35700, see S270-10-1.
CONTENTS
INTRODUCTION........................................................1
GENERAL DESCRIPTlON .......................................1
RATINGS AND SPECIFICATlONS ...........................2
Voltage Ratings .......................................................2
Current Ratings .......................................................2
DESCRIPTlON OF OPERATION ..............................2
PERlODIC INSPECTlON AND MAINTENANCE .....4
OlL CONDITION .......................................................4
OPERATING SETTINGS ..........................................5
SHOP MAINTENANCE PROCEDURES ..................5
Bushings .................................................................5
Hydraulic Mechanism ..............................................6
Contact Structure ....................................................7
Head Mechanism ....................................................8
Retanking The Sectionalizer ....................................8
SERVICE PARTS LIST ......................................10,11
Cooper Power Systems
Qf
INTRODUCTION
Service Information S270-10-6 covers the maintenance
instructions for the Type GH (Form 2) hydraulically-con-
trolled sectionalizer. This includes a general description of
operating principles, and instructions for periodic inspection,
testing, trouble-shooting, and shop repairs. A service parts
list keyed to an exploded-view drawing of the unit is includ-
ed at the back of the manual.
GENERAL DESCRIPTION
The Type GH sectionalizer is an automatic protective device
used to isolate permanent faults on single-phase distribu-
tion branch circuits. Applied in combination with a backup
recloser, the sectionalizer does not interrupt fault current
but counts the fault interrupting operation: of the backup
recloser.When a preset number of counts (1, 2 or
CAUTION
Do not energize this equipment out of oil.

Figure 2
Untanked view of Type GH sectionalizer.
Page 2
3) are registered within a definite time period, the sectionalizer
will automatically open during the open interval of the backup
recloser’s operating cycle. If the fault is cleared before the
required count total is reached, the counting mechanism of the
sectionalizer resets automatically. The unit is then ready to
count another cycle of operations should a new fault occur.
Once open, the sectionalizer must be manually operated to
reclose the circuit after the fault has been cleared. Although
the sectionalizer does not interrupt faults, it can be closed into
a faulted line without damage to the unit.
The unit can also be opened and closed manually and is capa-
ble of interrupting load currents within its switch rating.
RATINGS AND SPECIFICATIONS
Voltage Ratings
Nominal system voltage, kv rms ...........................14.4
Rated maximum voltage, kv rms ..........................15.0
Rated impulse withstand voltage (BIL) kv crest ....95
60-Hertz insulation level withstand, kv rms
Dry, one minute ..................................................35
Wet, 10 seconds ................................................30
Current Ratings
Continuous Actuating Short-Time Ratings
Current Current Momentary 1-second 10-second
(amps) (amps) and Making (sym (sym
(asym amps) amps) amps)
5 8 800 200 60
10 16 1600 400 125
15 24 2400 600 190
25 40 4000 1000 325
35 56 6000 1500 450
50 80 6500 2000 650
70 112 6500 3000 900
100 160 6500 4000 1250
140 224 6500 4000 1800
Max. Interrupting Loadbreak Rating (rms sym amps) ...........308
DESCRIPTION OF OPERATION
The Type GH hydraulic sectionalizer is actuated when its
solenoid coil (connected in series with the main contact) is sub-
jected to a current flow that exceeds 160 percent of its continu-
ous current rating. The response of the hydraulic mechanism to
an overcurrent is illustrated in Figures 3 through 6.
In Figure 3, the hydraulic control components are shown in their
usual at rest condition.The actuating component is

S270-10-6, Page 3
Figure 3
Hydrualic mechanism in normal at rest condition. Solenoid
plunger is held at the top of its stroke by spring pressure.
Figure 4
Overcurrent pulls down solenoid plunger against spring pres-
sure.Held by the lower check valve, the oil is forced through the
plunger into the space above it.
Figure 6
When overcurrent is interrupted on the final count, trip piston engages
the trip lever to open the toggle assembly which opens the sectionalizer
contacts.
Figure 5
Solenoid plunger returns to at rest condition when overcurrent is inter-
rupted. Held by the upper check valve, oil in the space above the
plunger is forced through the impulse valve raising the trip piston a
measured amount. Oil simultaneously enters space under solenoid
plunger.
the solenoid plunger, which functions as a pump. With nor-
mal load current flowing through the solenoid coil, spring
pressure holds the solenoid plunger at the top of its stroke.
When the current flow reaches actuating level, the resultant
magnetic force pulls the plunger down as shown in Figure 4.
This downward movement closes the check valve at the bot-
tom of the mechanism and forces a charge of oil upward
through the plunger into the space vacated by the plunger.
Upward pressure of the oil opens the check valve at the top
of the plunger to permit oil flow. The plunger is held in the
down position and the sectionalizer is now “armed-to-count”.
When the backup recloser interrupts the overcurrent, the
current flow through the series solenoid coil is interrupted.
With the coil deenergized, the magnetic field is lost and the
plunger is returned to its up position by the compressed
spring as shown in Figure 5. Upward movement of the plunger
closes the top check valve and forces the oil charge above the
plunger upward to raise the trip piston a measured amount. The
sectionalizer has now registered a count.
If the sectionalizer is set for more than one count-to-open, the
sequence is repeated with each overcurrent until the trip piston
engages the trip lever and opens the sectionalizer contacts (Figure
6).
After each count, the trip piston begins to slowly resettle to its orig-
inal position. The time during which it remembers previous counts
is sectionalizer memory time. If the fault is temporary and is
cleared before the sectionalizer opens, the piston will resettle com-
pletely and the unit is ready for another sequence of operations. If
the programmed number of counts is completed within the memo-
ry period, the sectionalizer will open. It then must be closed manu-
ally.

Page 4
PERIODIC INSPECTION AND MAINTENANCE
Frequency of inspection and maintenance depends upon the
local climatic conditions and the manual switching duty
imposed on the unit. The sectionalizer does not interrupt fault
currents, so contact wear and oil contamination due to arcing
will be minimal. Thus, maintenance efforts should be directed
primarily toward keeping the unit in operating order and main-
taining the dielectric strength of the insulating oil.
Cooper Power System's recommends that, initially, a mainte-
nance check be made after one year of service. A study of
maintenance records for similar equipment, along with the
results of the initial maintenance check can then be used to
establish realistic maintenance intervals.
Each periodic maintenance check should include at least the
following steps:
1. Bypass, trip and. deenergize the sectionalizer and remove it
from service.
2. Inspect the external components.
A. Check for broken or cracked bushings, paint scratches,
and other mechanical damage.
B. Close and trip the sectionalizer manually several times
to check mechanical operation. Leave the unit in the
open position.
3. Remove the bolts and clamps that secure the head casting
to the tank and remove the mechanism from the tank.
Carefully pry apart the head and tank to break the gasket
seal.
4. Allow the oil to drain off the mechanism.
5. Clean the internal components.
A. Remove all traces of carbon by wiping with a clean, lint-
free cloth.
B. Flush the hydraulic mechanism with clean transformer
oil.
6. Check the moving and stationary contacts.
A. Slight pitting and discoloration can be dressed with cro-
cus cloth or a fine-tooth file.
B. Replace the moving and stationary contacts if they are
severely eroded (see “Shop Maintenance Procedures”
section of this manual).
NOTE: The amount of erosion permissible is difficult to define.
Good judgment must be used when deciding whether to
replace the sectionalizer contacts.
7. Operate the control lever manually, and observe if all com-
ponents operate properly. When tripping the sectionalizer in
air, hold or cushion the moving contacts with one hand to
eliminate impact and overstressing of contact box.
8. Inspect tank liners. Soft or spongy areas indicate that water
has been absorbed. Replace both the tank wall
liner and tank bottom liner if this condition is detected.
NOTE: The 125-kv BIL unit has an additional wall iiner between
the standard liner and the tank which must also be replaced when
new liners are installed.
9. Check the dielectric strength of the insulating oil.
A. The dielectric strength should not be less than 22 kv
when tested with an 0.1-inch gap in accordance with
methods specified in ASTM D-117.
B. Low dielectric strength usually indicates the presence
of water or carbon deposits; replace the oil.
10. If oil must be replaced, drain the tank and clean out all
sludge and carbon deposits.
11. With the mechanism removed, fill the tank with clean insu-
lating oil to the top of the tank wall liner. Capacity is
approximately 1-1/2 gallons.
Use only new, or like-new reconditioned transformer oil
which conforms to the specifications in Cooper Power
System's Reference Data R280-90-1, “Oil Specifications
and Test”.
12. Examine the head gasket. Replace the o-ring gasket if it
has taken a permanent set.
13. Before retanking the sectionalizer, invert and prime the
hydraulic mechanism by introducing new transformer oil
with an ordinary squirt can through the hole in the bottom
of the coil frame. Then, quickly place the mechanism into
the tank far enough to cover the hydraulic mechanism with
oil. With a slender tool, such as a small Allen wrench,
push down the trip piston to clear air from the hydraulic
parts.
14. Reuse the head bolts and tank clamps and torque to 10-
14 ft -lbs. Clamping forces must be applied gradually and
equally in rotation to each bolt. This results in an evenly
distributed gasket sealing pressure.
15. Manually close and open the unit several times to expel all
air from the hydraulic system and to check the mechani-
cal operation.
16. Check if the unit is operating properly.With the sectionaliz-
er closed, momentarily connect a six-volt storage battery
across its bushing terminals. Repeat this procedure at
about one-second intervals and note if the sectionalizer
opens after the correct number of operations has
occurred. If the unit does not lock out properly, wait about
three minutes and repeat the test. Air entrapped in the
hydraulic system can cause incorrect operation.
If the unit still fails to operate properly, disassemble the
hydraulic mechanism as described in “Shop Maintenance
Procedures”. Check carefully for sludge accumulation,
dirt, or scratches on any of the parts. Clean the parts and
carefully reassemble the mechanism. Cleanliness is
very
important. Recheck the unit for proper operation.
OIL CONDITION
Oil plays an important role in the proper functioning of the
sectionalizer. It provides the internal insulation barrier from
phase-to-ground, and it acts as an arc quencher during man-
ual load switching.For effective sectionalizer operation, the
CAUTION
Never use volatile solutions, detergents, or water-soluble
cleaners.

S270-10-6, Page 5
Figure 8
Position of adjustment link.
Figure 9
Bushing removal.
Figure 7
Adjustment for number of counts-to-open.
oil must be replaced before it deteriorates beyond a safe
level. Oil that has been contaminated with carbon sludge or
has a dielectric strength of less than 22 kv should be
replaced.
New oil should always be filtered before using, even though
it may be obtained from an approved source. Passing the oil
through a blotter press will remove free water and solid con-
taminants such as rust, dirt or lint. When filtering the oil, aer-
ation should be kept to a minimum to prevent moisture in the
air from condensing in the oil and lowering its dielectric
strength.
Used oil must be treated before reusing. Filtering may
remove absorbed and free water and other contaminants to
raise the dielectric strength to acceptable levels. However,
fltering does not always remove water-absorbing contami-
nants and the dielectric strength of the oil may fall rapidly
after being returned to service. Therefore, the sectionalizer
should be filled with new oil or oil that has been restored to
like-new condition.
OPERATING SETTINGS
The minimum actuating current and the number of counts-
to-open can be changed to reprogram the operation of the
sectionalizer.
The minimum actuating current rating is determined by
the rating of the solenoid coil.To change the minimum actu-
ating current rating of the sectionalizer, replace the solenoid
coil as described in the “Shop Maintenance Procedures”
section.
The number of counts-to-open is determined by the posi-
tion of the adjustment link attached to the trip lever with a
cotter pin (Figure 7). Figure 8 shows the position of the
adjustment link for one, two, and three counts-to-open.
SHOP MAINTENANCE PROCEDURES
The procedures described in this section should be performed
under the cleanest conditions possible. The repair work, except
for bushing replacement, will be simplified if the work bench is
arranged so the mechanism can be inverted (bushings down).
No special tools are required for any of the repair procedures.
BUSHINGS
Bushing maintenance is generally limited to a thorough cleaning
during the regular maintenance inspection. If a bushing is
cracked or broken, it must be replaced.To replace a bushing, the
following procedure may be used (Figure 9):
1. Untank the sectionalizer and disconnect the lead from the bot-
tom of the bushing.
2. Remove the three capscrews and lockwashers that secure the
bushing clamps to the head and lift out the bushing assembly.

Figure 11
Lifting off coil support frame and coil.
Figure 10
Bushing assembly components.
Page 6
CAUTION
Be sure to pad the pliers jaws with heavy cardboard or sim-
ilar material to prevent marring the surface of the stringer.
3. Remove and discard the lower bushing gasket.
4, Twist off the aluminum clamping ring from the old bushing.If
it is in good condition install it on the new porcelain. If the
ring is damaged, a new clamping ring must be installed.
NOTE: The clamping ring cushions the pressure between the
bushing porcelain and the clamps and must not be omitted.
5. The complete bushing assembly can be replaced or new
porcelain only can be installed.
If new porcelain only is to be installed, see Figure 10, and
proceed as follows:
A. Remove the nut, spacer, gasket, and oil seal from the
lower end of the bushing and pour out the transformer
oil.
B. Unscrew the bushing terminal assembly and withdraw
the bushing rod.
C. Remove and discard the upper bushing terminal gasket.
D. Insert the rod all the way into the new porcelain and
assemble the terminal to the rod using a new terminal
gasket.
NOTE: Apply a very small amount of petrolatum jelly to the
inside face of the terminal before reassembly. It is necessary to
cover the knurled surface only.
E. Slowly fill the bushing with new, clean transformer oil.
F. Install a new oil seal and gasket and secure with the
spacer and hex nut.
6. Replace the bushing assembly into the head using a new
gasket between the bushing and head casting. Position the
bushing with the stud end of the terminal pointing outward.
7. Position the aluminum clamping ring with the split in the ring
centered between two clamping bolts.
8. Reinstall the bushing clamps and tighten the clamping
bolts evenly, a little at a time, with 3-7 ft -Ibs torque.
HYDRAULIC MECHANISM
1. Disconnect the contact lead from the bottom of the coil gap
by removing the brass jam nut that secures it.
2. Grasp the insulating stringer with a pair of pliers and
loosen the two capscrews that secure the coil frame to the
molded contact box. This procedure is necessary to pre-
vent breakage of the molded lugs on the contact box.
3. Lift off the support frame and coil as shown in Figure 11.
NOTE:The support frame, solenoid plunger, and bridge plate
solenoid assembly are a matched set.Replace all three parts if any
one is to be replaced.
4. Then lift off, in order, the plunger return spring,

S270-10-6, Page 7
Figure 13
Contact structure.
Figure 12
Components of hydraulic assembly.
Figure 14
CAUTION
Use extreme care to remove all traces of the degreasing
fluid and keep all parts clean and free from nicks or
scratches.
plunger, and cylinder-bridge plate assembly.The disassem-
bled hydraulic mechanism is shown in Figure 12.
5. Clean all hydraulic parts thoroughly and flush all passages
with clean degreasing fluid.
6. If the contact box assembly is to be replaced, do not
reassemble the hydraulic mechanism at this time.
Reassemble in the reverse order of the disassembly proce-
dure.
NOTE: Use two new solenoid coil gaskets (top and bottom) when the
coil is replaced or a new coil is installed.
CONTACT STRUCTURE
The contact structure and associated parts are shown in
Figure 13. To replace the moving contacts the entire molded
contact box must be replaced. Proceed as follows:
1. Unhook the opening springs shown in Figure 14.
2. Remove the C-ring and pin that connects the moving con-
tact operating link to the toggle assembly (Figure 13).
3. Remove the two capscrews that secure the contact box to the
insulating stringers. Again, use pliers to hold the stringers.
4. Lift off the entire contact structure.
5. Assemble new stationary contacts to the new contact box.
Components of the stationary contact assembly are

Figure 15
Components of stationary contact assembly.
Figure 16
Components of trip and latch mechanism.
Page 8
shown in Figure 15.
NOTE: Before tightening the stud, make sure that each arm of the
stationary contact assembly deflects an equal amount as moveable
contacts are brought into engagement. Adjust by slight movement of
the contact bracket and retainer.
6. Reassemble the contact box assembly in the reverse order
of disassembly.
HEAD MECHANISM
Normally the trip and latch mechanism assemblies mounted in
the head will require very little or no maintenance and need not
be disassembled. If replacement of a worn or broken part is
necessary, disassemble only to the extent required to install the
new part.
Figure 16 identifies and locates the various components of the
trip and latch mechanism.
RETANKING THE SECTlONALIZER
Follow steps 11 through 16 in the “Periodic Inspection and
Maintenance” section to retank and test the repaired sectional-
izer.
SERVICE PARTS LIST
When ordering service parts, always include the sectionalizer
type and serial number. Because of Cooper Power System's
continuous improvement policy, there may be occasions where
parts furnished may not be the same as the parts they are
replacing; however, they will be interchangeable. All service
parts have the same warranty as any whole item of switchgear;
i.e., against defects in material or workmanship within one year
from date of shipment.
For service parts list and catalog numbers, see pages 10
and 11.

S270-10-6, Page 9
NOTES

Page 10

Catalog Number
Item Description Number Required
38. Bracket KP261 GH 1
39. Maching screw, rd.hd., 10-32
x 3/8, stl. KP698 1
40. Toggle latch lever assembly KA132GH 1
41. Toggle latch lever spring KP286GH 1
42. Pin KP3054A2 1
43. Latch bracket KP13GH 2
44. Machine screw, 1/4-20 x 3/8,
stl., with preassembled
lockwasher KP108 2
45. Contact opening spring KP40GH 2
46. Groove pin KP49GH 1
47. Spacer assembly KA6GH 4
48. Contact frame assembly KA144GH 1
49. Adjustment link KP86GH 1
50. Flat washer, 5/16, SAE, stl. KP350 2
51. Capscrew, hex hd., 5/16-18
x 1, stl., with preassembled
lockwasher KP2 4
52. Contact post KP170GH 2
53. Contact bracket KP172GH 2
54. Stationary contact assembly KA141GH 2
55. Contact retainer KP171GH 2
56. Lead KP3251 A4 4
57. Flat washer, No.20S, brass KP342 2
58. Flat washer, No.14S, brass KP339 2
59. Lockwasher, med., 1/4-inch,
bronze KP1347 2
60. Hex nut, light jam, 1/4-20,
brass KP1225 2
61. Lead KP3251 A36 4
62. Trip piston KP79GH 1
63. Coil support assembly KA44GH 1
64. Return spring KP84GH 1
65. Solenoid gasket KP2090A51 2
66. Replacement solenoid coil kit
(includes coil, 2 of item 65
and 1 of item 19)
For 5 thru 50 amp (state coil
rating as suffix) KA106GH 1
For 70 thru 140 amp (state
coil rating as suffix) KA793GH 1
67. Lockwasher, med., 5/16-in., stl. KP1109 2
68. Capscrew, hex hd., 5/16-18 x
2, stl. KP183 2
69. Coil gap assembly KA116GH 1
70. Lead KA291GH 2
71. Flatwasher, 5/16-in., stl. KA336 1
72. Lockwasher, med,, 5/16, bronze KP348 4
73. Hex nut, light jam, 5/16-18,
brass KP1226 4
74. Tank wall liner KP115NR 1
75. Tank wall liner (125-kv BIL
only—in addition to item 74) KP289NR 1
76. Tank bottom liner KP114NR 1
77. Tank assembly KA21NR 1
78. Ground clamp KA227H 1
79. Capscrew, hex hd.,1/2-13 x 1,
stl. KP1282 1
S270-10-6, Page 11
Type GH (Form 2) Sectionalizer Parts List
Catalog Number
Item Description Number Required
1. Bushing assembly, standard KA346NR3 2
Bushing assembly, 17-inch
creepage KA346N R5 2
Bushing assembly, 125-kv BIL KA360NR 2
(above include items 2 thru 9)
2. Bushing terminal assembly KA45NR 2
Bushing terminal assembly
(for 125-kv BIL bushing) KA355NR 2
3. Upper bushing terminal gasket KP2090A50 2
Upper bushing terminal gasket
(for 125-kv Bl L bushing) KP2090A97 2
4. Bushing rod assembly (for
standard bushing) KA347NR3 2
Bushing rod assembly (for
17-inch creepage bushing) KA347NR5 2
Bushing rod (for 125-kv
BIL bushing} KP3149A45 2
4A. Insulating tube (for 125-kv
BIL bushing) KP3230A1 2
5. Oil seal KP118GH2 2
Oil seal (for 125-kv BIL
bushing) KP275NR 2
6. Gasket KP2090A43 2
7. Spacer KP3013A45 2
8. Hex nut, 5/16-18, brass KP283 2
9. Ceramic bushing, standard KP109NR 2
Ceramic bushing,17-inch
creepage KP189NR 2
Ceramic bushing, 125-kv BIL KP303NR 2
10. Bushing clamping ring KP110NR 2
11. Lower bushing gasket KP2090A40 2
12. Lifting strap KP421 H 1
13. Bushing clamp KP83NR 6
14. Capscrew, hex hd., 5/16-18
x 1-3/8, stl. KP1279 10
15. Lockwasher, med.5/16-in., stl. KP1109 10
16. Clamp KP276NR 4
17. Nameplate KP280GH 1
18. Self-tapping screw, rd.hd,
No.10 x 3/8, sst. KP52 2
19. Coil data plate KP190GH 1
20. Lockout data plate KP207GH 1
21. Self-tapping screw, rd.hd.,
No. 2 x 3/16, sst. KP69 4
22. Head casting KP215GH2 1
23. Shaft bushing KP3036A1 1
24. Head gasket KP2103A12 1
25. Handle and driver assembly KA147GH 1
26. Spring KP269GH 2
27. Reset lever assembly KA133GH 1
28. Spacer KP3004A57 1
29. Bushing KP3038A11 1
30. Spacer KP3004A32 1
31. Retaining ring, 3/16, Type C.
WA-510 KP72 4
32. Reset lever spring KP267GH 1
33. Toggle assembly KA135GH 1
34. Toggle spring KP268GH 1
35, Reset lever latch assembly KA131 GH 1
36. Groove pin KP3123A32 1
37. Reset lever latch spring KP11GH 1

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