4
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
otee:
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
otee:
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).
