Eaton 50 DHP Instruction book

Brand: Eaton

Model: 50 DHP

Type: Instruction book

This manual is also suitable for

Eaton 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 a convenient and safe means to:

Ground a circuit for maintenance work
Apply potential for cable testing
Access both bus and line circuits for “phasing out” tests

The Eaton 150 DHP has several features that make it a valuable tool for electrical contractors, maintenance personnel, and other professionals who work with electrical systems. These features include:

Rugged construction for long-lasting performance
Easy to install and operate

Eaton 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 a convenient and safe means to:

Ground a circuit for maintenance work
Apply potential for cable testing
Access both bus and line circuits for “phasing out” tests

Rugged construction for long-lasting performance
Easy to install and operate

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)

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.

iii

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

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

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

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).

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

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

- 50DHP 350 Dual features extended snubber design.

B B

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

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

B B

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.

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

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

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

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

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

Instruction Book IB182217EN October 2018 www.eaton.com

50 / 75 / 150 DHP [Cable or Hard Bus Application]

Ground and Test Device

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

Instruction Book IB182217EN October 2018 www.eaton.com

50 / 75 / 150 DHP [Cable or Hard Bus Application]

Ground and Test Device

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

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

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

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

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)

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

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 50 DHP Instruction book

Brand: Eaton

Model: 50 DHP

Type: Instruction book

This manual is also suitable for

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