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Instructions for the installation and
commissioning of Power Xpert IGX
medium-voltage switchgear
4.13. Installing cable side surge arresters
N
ote:
It may be desirable to install surge arrestors after voltage withstand
5.2.2.1. Preparation for PFWV test
testing. Refer to
Cable side surge arresters (if furnished) can be installed in a
cable connector tank inner cone, in the same fashion as any inner
cone connection. Refer to the arrester manufacturer's installation
instructions for installation guidance.
Figure 28. Typical cable side arrester (direct connected at the
cable connector tank).
1.
Clean the surge arrester connector using the furnished Cleaning
cloths soaked in cleaning solvent (see section 2.2.1. Standard
accessories (included with Power Xpert IGX):).
2.
Apply silicone grease to the cable connector tank inner cone
bushing.
3.
Install the surge arrester into the cable connector tank bushing.
Bolt it into place using
(4) M10 x 30 SHCS
(4) M10 flat washers
(4) M10 split lock washers
4.14. Installing cable side VTs
It may be desirable to install VTs after voltage withstand testing. Refer
N
ote:
5.2.2.1. Preparation for PFWV test.
to
Cable side voltage transformers are mounted remotely and
connected to a cable connector tank inner cone receptacle using an
inner cone connector terminated cable.
Refer to the inner cone cable connector manufacturer's installation
instructions for guidance on terminating the VT cable and connecting
it to a cable connection tank inner cone.
4.15. Cable connections
Power Xpert IGX switchgear is designed for bottom entry power
cables only. Cables are supported by clamps provided in the cable
compartment to reduce mechanical stress on connections and
prevent movement in the event of a fault. Depending upon the
design, there may be external voltage transformers located remotely
from the cable compartment but connected with cable connectors in
the Power Xpert IGX cable compartment.
All cable termination connectors are provided by others and installed
in the field.
4.16. Guidelines for customer selection of inner cone
connectors
Inner cone connectors can be obtained from several vendors,
including Eaton/Cooper, Pfisterer, and Shendian. The connector size
to be used will be determined by the Power Xpert IGX switchgear
rating.
See Figure 29 for an example cable side inner cone connector. Refer
to the inner cone connector manufacturer's instructions for guidance
on terminating the cable and installing the connector into the cable
connector tank inner cone.
Figure 29. Typical cable side inner cone connector.
4.17. Grounding
Power Xpert IGX groups must have their internal ground buses
connected to adjacent shipping groups or vertical sections. In
addition, the switchgear lineup must be connected to the customer
ground system at the lineup ends and at intermediate points within
the lineup as required. Individual Power Xpert IGX vertical sections
are connected to adjacent vertical sections using grounding splice
plates (see below).
Connect the vertical section horizontal ground buses using a copper
splice plate (see Figure 30 and Figure 31.
Connect the switchgear assembly to the station ground. Solderless
connections are provided on the ground bus at each end of the
switchgear for this purpose. The connection shall be made as direct
as possible. The connection shall be large enough to carry the
ground fault current of the installation. Never encase the ground bus
in a metal conduit.
• CAUTION
THE SWITCHGEAR INSTALLATION MUST BE PROPERLY GROUNDED.
N
ote:
For the design and installation of a grounding system, refer to Electrical
Power Distribution for Industrial Plants (Institute of Electrical Electronic
Engineers [IEEE] std 141); Grounding of Industrial and Commercial
Power Systems (IEEE std 142); and the NFPA 70, Articles 100, 200, and
250.
Figure 30. v Ground bus copper splice plate.
Instruction Booklet
IB022023EN
Effective April 2023
Revision #2
EATON www.eaton.com/IGX
29
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