Eaton 75 DHP Instruction book

Eaton
Brand
Eaton
Model
75 DHP
Type
Instruction book

This manual is also suitable for

Instruction Book IB182217EN
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Supersedes May 2016
Eective
October 2018
150 DHP Ground and Test Device (Hard Bus Type Device)
150 DHP Ground and Test Device (Cable Type Device)
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
m WARNING
IMPROPERLY INSTALLING OR MAINTAINING THESE PRODUCTS CAN
RESULT IN DEATH, SERIOUS PERSONAL INJURY OR PROPERTY DAMAGE.
READ AND UNDERSTAND THESE INSTRUCTIONS BEFORE ATTEMPTING
ANY UNPACKING, ASSEMBLY, OPERATION OR MAINTENANCE OF THESE
GROUND AND TEST DEVICES.
INSTALLATION OR MAINTENANCE SHOULD BE ATTEMPTED ONLY
BY QUALIFIED PERSONNEL. THIS INSTRUCTION BOOK SHOULD NOT
BE CONSIDERED ALL INCLUSIVE REGARDING INSTALLATION OR
MAINTENANCE PROCEDURES. IF FURTHER INFORMATION IS REQUIRED,
YOU SHOULD CONSULT EATON.
THE GROUND AND TEST DEVICES DESCRIBED IN THIS BOOK ARE
DESIGNED AND TESTED TO OPERATE WITHIN THEIR NAMEPLATE
RATINGS. OPERATION OUTSIDE OF THESE RATINGS MAY CAUSE THE
EQUIPMENT TO FAIL, RESULTING IN DEATH, BODILY INJURY AND
PROPERTY DAMAGE.
ALL SAFETY CODES, SAFETY STANDARDS AND/OR REGULATIONS AS
THEY MAY BE APPLIED TO THIS TYPE OF EQUIPMENT MUST BE STRICTLY
ADHERED TO.
THESE GROUND AND TEST DEVICES ARE DESIGNED TO BE INSTALLED
PURSUANT TO THE AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI).
SERIOUS INJURY, INCLUDING DEATH, CAN RESULT FROM FAILURE TO
FOLLOW THE PROCEDURES OUTLINED IN THIS MANUAL.
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY
The information, recommendations, descriptions and safety notations in this document are based on Eaton’s experience and judgment and
may not cover all contingencies. If further information is required, an Eaton sales office should be consulted. Sale of the product shown in
this literature is subject to the terms and conditions outlined in appropriate Eaton selling policies or other contractual agreement between
Eaton and the purchaser.
THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF FITNESS
FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, OTHER THAN THOSE SPECIFICALLY SET OUT IN ANY EXISTING CONTRACT
BETWEEN THE PARTIES. ANY SUCH CONTRACT STATES THE ENTIRE OBLIGATION OF EATON. THE CONTENTS OF THIS DOCUMENT
SHALL NOT BECOME PART OF OR MODIFY ANY CONTRACT BETWEEN THE PARTIES.
In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or other-wise for any
special, indirect, incidental or consequential damage or loss whatsoever, including but not limited to damage or loss of use of equipment,
plant or power system, cost of capital, loss of power, additional expenses in the use of existing power facilities, or claims against the
purchaser or user by its customers resulting from the use of the information, recommendations and descriptions contained herein. The
information contained in this manual is subject to change without notice.
This product was manufactured by Eaton at the Power Breaker
Center (PBC): 310 Maxwell Avenue, Greenwood, SC 29646.
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 his particular
installation, operation or maintenance of particular equipment,
contact an Eaton representative.
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Table of Contents
SECTION 1: INTRODUCTION 4
1.1 AVAILABLE 50/150 DHP GROUND AND TEST DEVICES 4
SECTION 2: SAFE PRACTICES 8
SECTION 3: RECEIVING, HANDLING, AND STORAGE 9
3.1 RECEIVING 9
3.2 HANDLING 10
3.3 STORAGE 10
3.4 DHP-GT APPROXIMATE WEIGHTS 10
SECTION 4: DESCRIPTION AND OPERATION 17
4.1 INSULATING BARRIERS 17
4.2 BUSHINGS AND DISCONNECTING CONTACT ASSEMBLIES 17
4.3 INTERLOCKS 17
4.4 GROUNDING CONTACTS 17
4.5 BREAKER-CELL CODING PLATES 17
4.6 CELL POSITION DESCRIPTION 17
4.7 INSTALLATION OF GROUNDING BUS BARS 18
4.8 DEVICE AMPERAGE CONVERSION PROCEDURE 18
4.9 UNIVERSAL 1200A/2000A G&T
CONFIGURATION (OPTIONAL) 19
4.7.1 Changing 1200A Finger Clusters to 2000A 19
4.7.2 Changing 2000A Finger Clusters to 1200A 20
SECTION 5: INSTALLATION & INSPECTION 22
5.1 EXAMINATION FOR DAMAGE 22
5.1.1 NAMEPLATE VERIFICATION 22
5.2 INSTALLATION OF GROUNDING CABLES 22
5.3 SNUBBER ADJUSTMENT 22
5.2 INSERTION PROCEDURES 22
5.5 REMOVAL PROCEDURE 23
SECTION 6: INSPECTION AND MAINTENANCE 24
6.1 INTRODUCTION 24
6.2 FREQUENCY OF INSPECTION 24
6.3 INSPECTION AND MAINTENANCE PROCEDURES 24
6.4 INSULATION INTEGRITY CHECK 24
SECTION 7: REPLACEMENT OF COMPONENTS 25
7.1 GENERAL 25
7.1.1 ORDERING INSTRUCTIONS 25
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
SECTION 1: INTRODUCTION
This booklet provides instructions for both the cable-type and
hard bus-type ground and test devices designed specifically for
Westinghouse 50 and 150 DHP metalclad and metal enclosed
switchgear. Instructions are provided for receiving and handling,
storage, installation, operation and maintenance of the G&T. Various
configurations of G&T devices are available: three terminals only
on the upper (line) position, three terminals only on the lower (load)
position, and six terminals in the upper and lower positions. This
instruction booklet may be used for all types.
The cable-type G&T devices are provided with sufficient cables per
phase to perform the short time rating appearing on the device
nameplate. The cable-type G&T cannot be converted to a hard bus-
style G&T.
Hard bus style G&T devices feature silver plated copper bus
bars instead of cables. These bus bars decrease the possibly of
G&T failure that can occur in cable designs. Their unique design
does not allow cables to be installed. The hard bus shorting bars
are configured so that, when installed, the G&T door for those
terminals cannot be closed so that visual inspection can confirm that
the shorting bars are in place. In this way, the hard bus type of G&T
is similar in operation to the cable type as terminal doors cannot be
closed when cables are installed.
Type 50/150 DHP manual ground and test devices are designed for
insertion into the breaker compartment to gain access to the primary
stationary contacts. It provides convenient means to:
1. Ground a circuit for maintenance work;
2. Apply potential for cable testing; and,
3. Access both bus and line circuits for “phasing out” tests.
m CAUTION
BECAUSE OF THE UNIQUE APPLICATION AND VAST VARIETY OF SYSTEM /
USER REQUIREMENTS, SPECIFIC SAFE OPERATING PROCEDURES FOR THE
USE OF THIS DEVICE MUST BE DEVELOPED BY THE USER.
m WARNING
SATISFACTORY PERFORMANCE OF THESE GROUND AND TEST DEVICES
IS CONTINGENT UPON PROPER APPLICATION, CORRECT INSTALLATION
AND ADEQUATE MAINTENANCE. THIS INSTRUCTION BOOK MUST BE
CAREFULLY READ AND FOLLOWED IN ORDER TO OBTAIN OPTIMUM
PERFORMANCE FOR LONG USEFUL LIFE OF THE GROUND AND TEST
DEVICES.
THESE GROUND AND TEST DEVICES ARE PERSONNEL PROTECTIVE
DEVICES, AS SUCH, THEY ARE MAXIMUM RATED DEVICES. THEREFORE,
THEY SHOULD NOT UNDER ANY CIRCUMSTANCES BE APPLIED OUTSIDE
THEIR NAMEPLATE RATINGS.
1.1 AVAILABLE 50/150 DHP GROUND AND TEST DEVICES
Refer to Table 1 and 2.
Table 1. 50/150DHP Ground and Test Device (Hard Bus Application) Availability and Interchangeability
Maximum Voltage Class
(kV)
Existing MVA Rating Existing Rated
Continuous Current at
60 Hz (Amps)
Rated Short-Circuit Time Current
kA / RMS / Symmetrical
Rated Momentary Current
kA / Peak
BIL Capability
(kV)
4.76 250 1200 / 2000 36 97 60
4.76 350 1200 / 2000 / 3000 49* 132 60
8.25 / 15 500 1200 / 2000 / 3000 41*/ 23 130 95
ote:N * Actual ground current (I
2
t) capability is limited to the cell ground bus. To achieve a full rating, ground connecting bus in cell must be
replaced with Eaton part 94G7103H09 (one per circuit breaker compartment).
Table 2. 50/150DHP Ground and Test Device (Cable Application) Availability and Interchangeability
Maximum Voltage Class
(kV)
Existing MVA Rating Existing Rated
Continuous Current at
60 Hz (Amps)
Rated Short-Circuit Time Current
kA / RMS / Symmetrical
Rated Momentary Current
kA / Peak
BIL Capability
(kV)
4.76 250 1200 / 2000 36 97 60
4.76 350 1200 / 2000 / 3000 49* 132 60
8.25 / 15 500 1200 / 2000 41* / 23 62 95
ote:N * Actual ground current (I
2
t) capability is limited to the cell ground bus. To achieve a full rating, ground connecting bus in cell must be
replaced with Eaton part 94G7103H09 (one per circuit breaker compartment).
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Table 3. DHP Ground and Test Device Dimensions (Cable Application Design)
Breaker Type
Existing Breaker
Rated Continuous
Current at 60 Hz
(Amps) A B C D E F G H
50DHP 250 Dual 1200 / 2000 20.50 7.00 36.13 2.94 15.12 6.81 16.50 8.50
50DHP 350 Dual
a
1200 / 2000 20.30 7.00 36.73 2.94 15.12 11.24 16.50 8.50
50DHP 350 3000A Dual 1200 / 2000 29.75 10.00 36.13 2.94 19.35 7.70 19.50 8.50
75 / 150DHP 500 Dual 1200 / 2000 29.38 10.00 36.25 2.94 23.75 10.14 19.38 10.00
a
- 50DHP 350 Dual features extended snubber design.
A
B B
C
D
E
F
G
H
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Table 4. DHP Ground and Test Device Dimensions (Hard Bus Application Design)
Breaker Type
Existing Breaker
Rated Continuous
Current at 60 Hz
(Amps) A B C D E F G H
50DHP 250 Dual 1200 / 2000 32.00 19.72 7.00 19.45 8.50 16.50 2.00 5.33
B
A
C
C
D
G
H
F
E
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Table 5. DHP Ground and Test Device Dimensions (Hard Bus Application Design)
Breaker Type
Existing Breaker
Rated Continuous
Current at 60 Hz
(Amps) A B C D E F G H
150DHP 500 Dual 1200 / 2000 28.43 10.00 38.85 5.25 23.94 6.00 19.75 10.00
A
B B
C
D
E
F
G
H
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
SECTION 2: SAFE PRACTICES
Ground and Test Devices are designed with several built-in interlocks
and safety features to provide safe and proper operating sequences.
m WARNING
TO PROTECT THE PERSONNEL ASSOCIATED WITH INSTALLATION,
OPERATION, AND MAINTENANCE OF THE GROUND AND TEST DEVICES,
THE FOLLOWING PRACTICES MUST BE FOLLOWED:
• Only qualified persons, as defined in the National Electrical Safety Code, who are
familiar with the installation and maintenance of medium voltage circuits and
equipment, should be permitted to work on the ground and test device.
• Read these instructions carefully before attempting any installation, operation or
maintenance of the ground and test device.
• Always remove the ground and test device from the enclosure before performing any
maintenance. Failure to do so could result in electrical shock leading to death, severe
personnel injury or property damage.
• Do not leave the ground and test device in an intermediate position in the cell. Always
have the ground and test device either in the DISCONNECT or CONNECTED position.
Failure to do so could result in a flash over and possible death, personnel injury or
property damage.
• Keep all insulating surfaces, which include primary support insulation and insulation
barriers, clean and dry.
• Check all primary circuit connections to make certain they are clean and tight.
• Take extreme care while using this device to avoid contacting “live” or “hot”
(energized) terminals.
• These ground and test devices are equipped with safety interlocks. Do not defeat
them. This may result in death, bodily injury or equipment damage.
• Correctly identify LINE and BUS terminals for the breaker compartment before using
this device.
• Store the device in a clean, dry area free from dust, dirt, moisture, etc.
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
SECTION 3: RECEIVING, HANDLING, AND
STORAGE
Ground and test (G&T) devices are subjected to complete factory
production tests and inspection before being packed. They are
shipped in packages designed to provide maximum protection to
the equipment during shipment and storage and at the same time
to provide convenient handling. Accessories such as the grounding
cables are shipped with the ground and test device.
3.1 RECEIVING
Until the ground and test device is ready to be delivered to the
switchgear site for installation, DO NOT remove it from the shipping
crate. If the ground and test device is to be placed in storage,
maximum protection can be obtained by keeping it in its crate.
Upon receipt of the equipment, inspect the crates for any signs of
damage or rough handling. Open the crates carefully to avoid any
damage to the contents. Use a nail puller rather than a crow bar
when required.
When opening the crates, be careful that any loose items or
hardware are not discarded with the packing material. Check the
contents of each package against the packing list. Examine the
ground and test device for any signs of shipping damage such as
broken, missing or loose hardware, damaged or deformed insulation
and other components. File claims immediately with the carrier if
damage or loss is detected and notify the nearest Eaton office.
Tools and Accessories
Racking Handle: A racking handle is not provided for all 50 and 150
DHP G&T types because it is identical in form, fit, and function to
the racking handle provided with the original DHP air circuit breakers.
Use the racking handle originally provided to engage the racking
shaft of the G&T racking mechanism to move the device into and
out of the circuit breaker compartment.
Grounding Cables: Grounding cables are provided only on the
cable-type G&T devices. The appropriate size and number of cables
are furnished to match the rated short time and momentary ratings.
The terminated cables may be bolted to the appropriate terminals
and to the ground connections provided on the G&T device.
Grounding Shorting Bars: Three grounding shorting bars are
furnished only on hard bus-type G&T devices. These bars may be
positioned for grounding either the three upper or the three lower
terminals of a six terminal device, as required. Bars are configured
to prevent closing the terminal doors when they are installed (Figure
3.1.d).
Bushing Wrench: A special wrench is provided only on G&T
devices that have interchangeable primary disconnects. These
convertible devices are equipped with extra 1200, 2000, and/or
3000 ampere terminals. This bushing wrench is recommended for
removal and installation of primary disconnects (knobs or finger
cluster assemblies) to allow the G&T to be used in circuit breaker
compartments that have the same short circuit currents available but
differing continuous current ratings.
Interlock Keys: Key interlocked terminal access doors are provided
to supplement site lock out, tag out strategies. Required by G&T
standard C37.20.6, these Kirk
®
Key interlocks prevent simultaneous
access to both the upper and lower terminals only on six terminal
devices. Special coded keys are provided for use with each G&T
device. If keys are lost or damaged, contact Eaton for replacement.
Figure 3.1.a. RackingHandle
Figure 3.1.d. Grounding Copper Shorting Bars
Figure 3.1.b. Grounding Cable
Figure 3.1.c. Bushing Wrench
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
3.2 HANDLING
m WARNING
DO NOT USE ANY LIFTING DEVICE AS A PLATFORM FOR PERFORMING
MAINTENANCE, REPAIR OR ADJUSTMENT. THE GROUND AND TEST
DEVICE MAY SLIP OR FALL CAUSING SEVERE PERSONAL INJURY.
ALWAYS PERFORM MAINTENANCE, REPAIR AND ADJUSTMENTS ON A
WORKBENCH CAPABLE OF SUPPORTING THE GROUND AND TEST DEVICE
TYPE.
DHP ground and test device shipping containers are designed to
be handled by a forklift truck. If containers must be skidded for any
distance, it is preferable to use roller conveyors or individual pipe
rollers.
Once a G&T device has been inspected for shipping damage, it is
best to return it to its original shipping crate until it is ready to be
installed in the Metal-Clad Switchgear.
When a ground and test device is ready for installation, a lifting
harness in conjunction with an overhead lift or portable floor lift can
be used to move a G&T device. This could be preferable to rolling
the G&T device on the floor using self-contained wheels. If the G&T
device is to be lifted, position the lifting device (lifting straps should
have at least a 1600 lb capacity) over the G&T. Stand a safe distance
away from the device while lifting and moving.
Figure 3.2.a. Front External View of 50DHP G&T Device
Figure 3.2.b. Front External View of 150DHP G&T Device
3.3 STORAGE
If the ground and test device is to be placed in storage, maximum
protection can be obtained by keeping it in the original shipping
crate. Before placing it in storage, checks should be made to make
sure that the G&T device is free from shipping damage and is in
satisfactory operating condition.
Outdoor storage is NOT recommended. If unavoidable, the outdoor
location must be well drained and a temporary shelter from sun,
rain, snow, corrosive fumes, dust, dirt, falling objects, excessive
moisture, etc. must be provided. Container should be arranged to
permit free circulation of air on all sides and temporary heaters
should be used to minimize condensation. Moisture can cause
rusting of metal parts and deterioration of high voltage insulation.
A heat level of approximately 400 watts for each 100 cubic feet
of volume is recommended with the heaters distributed uniformly
throughout the structure near the floor.
Indoor storage should be in a building with sufficient heat and air
circulation to prevent condensation. If the building is not heated, the
same general rule for heat as for outdoor storage should be applied.
3.4 DHP-GT APPROXIMATE WEIGHTS
Refer to Table 6.
Table 6. Maximum Weight by Type
Type Amperes LBs
50DHP 250 / 350 Dual 1200 / 2000 230
50DHP 350 3000 460
75 / 150DHP 500 Dual 1200 / 2000 / 3000 405
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Front External View (50DHP G&T Shown)
1 Kirk
®
Key Interlocks 3 Ground Bus 5 Rail Latch
2 Door Latch 4 Levering Shaft
Figure 3.3.a. Front External View of DHP G&T Device
1
5
4
2
3
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Figure 3.3.b. Rear External View of DHP G&T Device
1
1
2
6
5
4
3
Front External View (50DHP G&T Shown)
1 Primary Disconnects 3 Snubber Bolt 5 Code Plate
2 Shutter Roller 4 Racking Nut 6 Grounding Contact
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
1
5
4
2
3
Figure 3.3.c. Front External View of 50DHP 350 G&T 3000A Device
Front External View (150DHP G&T Shown)
1 Lifting Points 3 Ground Bus 5 Rail Latch
2 Kirk
®
Key Interlocks 4 Levering Shaft
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
1
1
2
5
4
3
Figure 3.3.d. Rear External View of 50DHP 350 G&T 3000A Device
Back External View (150DHP G&T Shown)
1 Primary Disconnects 3 Snubber Bolt 5 Grounding Contact
2 Shutter Roller 4 Racking Nut
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Figure 3.3.e. Front External View of 150DHP-GT-500 1200A/2000A Device
Front External View
1 Padlock Provision 3 Lifting Points 5 Levering Shaft
2 G&T Storage Compartment* 4 Kirk
®
Key Interlocks
ote:N *Only offered for 150DHP-GT 1200A/2000A Convertible designs
4
3
5
2
1
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
Figure 3.3.f. Rear External View of 150DHP-GT-500 1200A/2000A Device
Back External View
1 Primary Disconnect 3 Grounding Contact 5 Ground Bus
2 Snubber Bolt 4 Lifting Point 6 Code Plate
6
4
5
2
3
1
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
SECTION 4: DESCRIPTION AND OPERATION
The G&T is a draw out device that can be inserted into a circuit
breaker cubicle in the same manner as the 50/150DHP Air Circuit
Breaker and Vacuum Replacement Circuit Breaker. It can be ordered
as a single terminal device or a double terminal ground and test
device. Each terminal is isolated from each other and the ground bus
connections by insulating barriers. The upper and lower terminals are
accessible upon opening the respective fronthinged door. The ground
connection is located in the lower section of the device.
m WARNING
IT IS MOST IMPORTANT THAT THE BUS OR LINE TERMINALS BE
CORRECTLY IDENTIFIED FOR EACH COMPARTMENT BEFORE USING THIS
DEVICE.
Type 50/150DHP manual Ground & Test devices are also available
with either the upper or lower terminals only.
4.1 INSULATING BARRIERS
Insulating barriers are red pieces of GPO-3 glastic material used
to isolate the primary terminals from each other and the ground
connections. They are attached to the ground and test device frame
using insulated hardware. Using other hardware than those provided
will affect the insulating integrity of the ground and test device.
4.2 BUSHINGS AND DISCONNECTING CONTACT
ASSEMBLIES
The upper and lower bushings, which are the primary circuit
terminals of the ground and test device, consist of silver plated
insulated conductors. Multiple finger type primary disconnecting
contacts at the ends of the conductors provides means for
connecting and disconnecting the G&T device to the bus terminals
in the switchgear compartment. (Figure Set 3.3)
4.3 INTERLOCKS
The only interlocks associated with these Ground and Test devices
are the Kirk
®
Key interlocks located on the front of the device. (Figure
Set 3.3) This protects the user from having both top and bottom
hinged doors open at the same time. While either the top or bottom
door is unlocked, the key is unable to be removed from the lock. To
remove the key, close the appropriate door and turn the key. This
will lock the door and the key will now be able to be removed and
inserted into the other lock. This feature is not applicable for single
terminal ground and test.
m NOTICE
ONLY ONE KEY WILL BE PROVIDED WITH EACH GROUND AND TEST
DEVICE. THIS PREVENTS THE INTERLOCKING MECHANISM FROM BEING
BYPASSED. IF A KEY IS LOST, CONTACT EATON FOR A REPLACEMENT.
THIS FEATURE IS NOT APPLICABLE FOR SINGLE TERMINAL GROUND AND
TEST.
m WARNING
INTERLOCKS ARE PROTECTIVE DEVICES FOR PERSONNEL AND
EQUIPMENT. DO NOT BYPASS, MODIFY, OR MAKE INOPERABLE ANY
INTERLOCKS. DOING SO COULD CAUSE DEATH, SERIOUS PERSONNEL
INJURY, AND / OR PROPERTY DAMAGE.
4.4 GROUNDING CONTACTS
The grounding contact is an assembly of spring-loaded fingers,
which ground the device by engaging the switchgear cell grounding
bus when the G&T device is levered into the “connect” position. The
ground contact is located at the rear of the device, on the truck, and
visible from the back of the device when out of the cell. (Figure Set
3.3)
Figure 4.2. G&T Device In Connect Position - Position “C”
4.5 BREAKER-CELL CODING PLATES
This is a combination of a notched plate in the cell and interference
bars on the breaker, so that only appropriately rated breakers can be
put into the cell (Figures 4.1 and 4.2).
ote:N Code Plates provided on 1200A and 2000A devices only.
m WARNING
FOR 1200/2000A UNIVERSAL GROUND & TEST DEVICES A CODE PLATE HAS
BEEN FACTORY INSTALLED TO MATCH THE RATING OF THE FACTORY-
INSTALLED PRIMARY DISCONNECTS. ENSURE THAT THE CORRECT
PRIMARY DISCONNECTS AND CODE PLATES HAVE BEEN INSTALLED
FOR THE CORRECT APPLICATION. TO CHANGE THE CODE PLATE SIMPLY
REMOVE AND TURN AROUND SO THAT THE BAR IS POSITIONED AT THE
TOP.
4.6 CELL POSITION DESCRIPTION
Position A: This is the withdrawn position. In the withdrawn position,
the ground and test device is out of the cell. The racking handle is
not required for this position.
Position B: As the G&T device is pushed into the cell, it will reach a
mechanical stop. This is the “disconnect / test” position.
Position C: Continue rotating the racking handle until the rotating
handle turns freely, and the G&T device stops moving. The device
will have reached the “connect” position. (Figure 4.2) Remove the
racking handle.
Figure 4.1. G&T Code Plates (1200A Shown)
5kV
15kV
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Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
4.7 INSTALLATION OF GROUNDING BUS BARS
ote:N Use hardware provided with the ground and test device installed
as shown. (Figure 5.1)
a. Determine the set of terminals to be grounded for test purposes.
Ground and Test bus bars may be used on the upper or lower
terminals of six terminal ground and test devices.
b. Using the key provided (Figure Set 3.3) with each G&T device,
unlock the appropriate door, exposing the terminals.
This feature is not applicable for single terminal ground and test
devices.
c. Using the included 1.5 inch long, ½-13 hex bolts with doubled flat
washers, attach one end of each grounding bus bar (Figure 3.2)
to the internal terminal corresponding to each phase (Figure 5.1).
Grounding bar can only be installed one way. Take care to align
the mounting bolts with the integral nut block behind the copper
terminal. Do not fully tighten the mounting hardware.
Figure 4.3. Attaching Grounding Bus Bars to Ground Bus
d. Attach the other end of the grounding bus bar to the horizontal
ground bar (Figure 5.1) with the included 1.5 inch long, ½-13 bolt
with double flat washers. Horizontal bus bar is between the upper
and lower terminal compartments. Weld nuts are located behind
this bus bar. Do not fully tighten the mounting hardware.
e. Returning to the internal terminals, fully tighten this hardware.
Torque to 50 ft lbs.
f. Finally tighten the hardware to secure grounding bus bar to
horizontal ground bus. Torque to 50 ft lbs.
g. When properly installed, the hard bus grounding parts are
configured to prevent closing the terminal access doors. Just as it
is impossible to close terminal doors on cable-type G&T devices,
the hard bus-style G&T device holds the access door open to
provide a visible reminder that the hard bus shorting bars are
installed.
4.8 DEVICE AMPERAGE CONVERSION PROCEDURE
The primary circuit terminals of the ground and test device consists
of cycloaliphatic bushings with silver plated copper conductor
‘knobs’. Primary disconnecting contacts are attached to the knobs;
these primary disconnects are configured to engage the circuit
breaker compartment primary disconnects. It is critical to confirm
that 1200 ampere primary disconnects are installed prior to insertion
in 1200 ampere circuit breaker compartments; likewise for tests in
2000 ampere circuit breaker compartments. THIS CONVERSION
ALSO REQUIRES A CODE PLATE CHANGE PRIOR TO RACKING
THE G&T INTO ITS CIRCUIT BREAKER COMPARTMENT. Follow
the procedure below to convert from one primary current design to
the other.
a. With the ground and test device located in an appropriate work
area, remove the existing primary disconnects installed on the
G&T using only the wrench provided (Figure 4.4) at the location
shown in Figure 4.5. Some wrenches can damage the primary
disconnect knobs; they should be avoided.
b. After removing the primary disconnect knobs, remove the primary
disconnects to be installed from the G&T storage bin and thread
them onto the bushings. The primary disconnects just removed
should be promptly stored in the storage bin to avoid damage to
them.
c. Hand tighten the primary disconnects onto the primary bushings.
Using the special wrench provided, complete tightening the
primary disconnect knobs until they are snug tight. Overtightening
these knobs is not necessary and may damage the knobs or
make them very difficult to remove at a future time.
d. THE GROUND AND TEST CODE PLATE MUST BE CHANGED AT
THIS TIME. The ground and test device will be blocked from full
insertion in the circuit breaker compartment until the code plate
position is changed. The code plate is a mandatory safety feature
that must not be removed and discarded.
e. The code plate position is changed by removing the two nuts and
bolts rotating the bracket 180 degrees and re-installing. Figure
4.1 shows the code plate positioned for insertion in 1200 ampere
circuit breaker compartments.
Figure 4.4. G&T Storage Compartment
Figure 4.5. Primary Disconnect Amperage Conversion
(2000A Adapter Bushing w/ 2000A Primary Disconnects Shown)
19
Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
4.9 UNIVERSAL 1200A/2000A G&T CONFIGURATION
(OPTIONAL)
A special design of the DHP Ground and Test Device (G&T) allows
the separate grounding of both 1200A and 2000A circuit breaker
cubicles. Since the device can be inserted into either cubicle design,
the finger clusters and the G&T code plate must be matched to the
ampere rating of the cell stabs.
m DANGER
FAILURE TO CORRECTLY MATCH THE FINGER CLUSTER RATINGS AND
G&T CODE PLATES TO THE CELL STAB AMPERE RATING CAN RESULT IN
DEATH, SERIOUS PERSONNEL INJURY, AND / OR PROPERTY DAMAGE.
Step 1 - Determine the ampere rating of the cell structure that is to
be grounded or tested with the G&T device.
Step 2 - Verify that the code plate is installed properly by referring
to Section 4.5 in this instruction book based on the ampere rating.
If the code plate is incorrectly mounted, remove it and remount to
match the proper ampere rating.
Step 3 - The correct finger cluster (1200A or 2000A) must match
the cell stab ampere rating prior to inserting the G&T device. If the
incorrect finger cluster is mounted on the G&T device, remove it and
install the proper finger cluster.
4.7.1 Changing 1200A Finger Clusters to 2000A
The 1200A DHP finger cluster is easily changed by removing the
5/16” hex head bolt, lock washer, and large retaining washer.
(Figure 4.6 & 4.7) Retain the hex head bolt and lock washer for
re-installation or for mounting a 2000A universal G&T finger cluster.
fingers (Figure 4.10). The finger cluster should be re-waxed each
time a finger cluster is changed or approximately every 50 insertions
and removals. The wax will not form a build-up and will not attract
dirt and contaminants if properly applied.
Figure 4.6. 1200A Finger Cluster Removal
Figure 4.7. Finger Cluster Hardware
Pull the finger cluster assembly off the G&T primary conductor.
Repeat the process for all finger clusters.
Select a 2000A universal G&T finger cluster (Figure 4.8).
Apply a thin film of wax (Johnson’s Paste Wax-available from many
retailers-used for furniture) to the outer surface of the primary
conductors (Figure 4.9) and to the inside contact surfaces of the
Figure 4.8. 2000A Universal G&T Finger Cluster
Figure 4.9. Waxing Primary Conductors
Figure 4.10. Waxing 2000A Universal G&T Finger Cluster
20
Instruction Book IB182217EN October 2018 www.eaton.com
50 / 75 / 150 DHP [Cable or Hard Bus Application]
Ground and Test Device
m DANGER
DO NOT USE GREASE OF ANY KIND. GREASING OF THE FINGER CLUSTERS
OR PRIMARY CONDUCTORS WILL VOID THE WARRANTY AND OVER TIME
CAN CAUSE A BUILDUP OF CONTAMINANTS THAT CAUSE TRACKING
OVER THE SURFACE OF THE INSULATION OR WITHIN THE CELL BOTTLES.
FAILURE TO HEAD THIS WARNING CAN CAUSE DEATH, SERIOUS
PERSONNEL INJURY, AND / OR PROPERTY DAMAGE.
•
Orient the finger cluster with the smaller diameter of the fingers
towards the primary conductor.
•
Place the large retaining washer inside the finger cluster cavity.
•
Insert the longer 5/16” hex bolt through the finger cluster and
retaining washer. (Figure 4.11)
•
Push the finger cluster against the primary conductor stem.
(Figure 4.12)
4.7.2 Changing 2000A Finger Clusters to 1200A
The 2000A Universal G&T DHP finger cluster is easily changed by
removing the 5/16” hex head bolt, lock washer, and large retaining
washer. (Figure 4.7)
Grasp the 2000A Universal G&T finger cluster firmly and pull to
remove from the primary conductor. (Figure 4.14)
Figure 4.11. Finger Cluster Hardware
Figure 4.13. Fitting 2000A Universal G&T Finger Cluster
Figure 4.14. 2000A Universal G&T Finger Cluster Removal
Figure 4.12. Finger Cluster Hardware
•
Thread the hex bolt into the primary conductor stem and tighten
to pull the finger cluster onto the primary stem. Once the finger
cluster is drawn onto the primary conductor stem, but not fully
seated, remove the long 5/16” hex bolt.
•
Thread the shorter hex head bolt and lock washer into the primary
conductor stem and tighten until the flat washer is collapsed. Do
not over tighten. (Figure 4.13)
•
Repeat the process until all finger clusters are changed to the
proper rating.
Remove the large retaining washer if the finger cluster is to be
replaced or if mounting a 1200A DHP finger cluster. Repeat the
process for all finger clusters.
Select a 1200A DHP finger cluster.
Apply a thin film of wax (Johnson’s Paste Wax-available from many
retailers-used for furniture) to the outer surface of the primary
conductors (Figure 4.9) and to the inside contact surfaces of the
fingers (Figure 4.15). The finger cluster should be re-waxed each
time a finger cluster is changed or approximately every 50 insertions
and removals. The wax will not form a build-up and will not attract
dirt and contaminants if properly applied.
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Eaton 75 DHP Instruction book

Eaton
Brand
Eaton
Model
75 DHP
Type
Instruction book
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