1. Ground
Use the Megger supplied Safety Ground Cable
to connect the TTRU3 ground terminal directly
to local station earth ground. Ensure that the
transformer chassis also has a low impedance
connection to local station earth ground poten-
tial.
2. Input Power
Ensure the Input Power Source meets the re-
quirements as listed in Section 2 Safety and Sec-
tion 3 Specifications. Make sure ON/OFF switch
is in the OFF position. Connect power cable to
the TTRU3 first, then to the source. At this time,
leave the ON/OFF switch in the OFF position.
3. Primary & Secondary/Tertiary leads to
TTRU3
With the clamps disconnected from the UUT,
connect the primary and secondary/tertiary leads
to the TTRU3. Be sure that all plugs are fastened
securely to the TTR so they will not become
loose even in the event of the operator inadvert-
ently tripping over the leads.
4. Primary & Secondary/Tertiary leads to UUT
When testing high-voltage transformers, caution
must be used at all times and all safety precau-
tions followed. Read, understand, and employ
all safety precautions and circuit connections
described above and in Sections 2 Safety.
Environmental conditions can lead to corrosion
of the UUT terminals. Ensure that the leads are
making direct contact with metal.
4.2 Making Circuit
Connections
Connections should be made in the order
listed below.
Use leads of appropriate length for the UUT. Ensure
leads are not tightly coiled, as this may influence the
ratio measurement.
5. OLTC Leads to OLTC
Refer to the OLTC wiring diagram for proper
lead connection.
Preparing for test
Information subject to change without notice 17
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