GE Multilin 350 Operation & Maintenance Manual page 50

FT Test Plugs
The Test Plug with a maximum of 10 positions is designed to match
the pole configuration of specific styles of FT Switches. Not every
switch configuration is suitable to accept a Test Plug. For available
styles, see switch selection tables.
10-Pole "In-Service Series" Test Plug Inserted into FT Test Switch
In-Service Series Test Plug
Provision is made only on current poles with shorting springs to
automatically short-circuit current transformer circuits when the
knife switches are opened prior to inserting the Test Plug.
This Test Plug is typically used to connect devices measuring the
currents and voltages being applied to the switchboard relays, meters
and instruments without interrupting or short-circuiting the circuit.
Only the current test switches with the current jack must be opened
before inserting the Series Test Plug. Connections to the test plug must
be made before inserting the test plug into the FT Switch. Before
inserting the Test Plug, all switchblades that are opposite bi-conductor
paddles must be placed in the full open position.
10-Pole "In-Service Series" Test Plug
Single Pole Current Test Plug with Open
Secondary CT Protection
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secondary
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and deviation from correct test procedures
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installed meters, relays and CT's
How it works
If a CT opens during operation:
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voltage conditions for personnel and equipment
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circuit causing an over-voltage condition
Features
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measurement with an ammeter
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Ordering Information:
Catalog Number
SPTP-01
SPTP-02
www.GEDigitalEnergy.com
FT & RT Test Switches
Open Circuit CT Protection
Yes
No
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