DV Power TRT03 Manuel - Page 8

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TRT03

3 Getting Started

3.1 Connecting TRT03 to a Test Object

Before TRT03 has been connected to a test object (e.g. power transformer), the following steps have to be
verified:
•
The test object is disconnected from its circuit in accordance with the national safety regulations and
is properly grounded to the protective earth.
•
The transformer is completely de-energized.
•
TRT03 itself should be properly grounded. To do this, the grounding screw on the top of TRT03
should be connected to PE using the provided grounding cable.
Note:
Always connect measuring cables to TRT03 first and then to the test object terminals.
Additionally, measuring cables can be connected to the test object terminals first, but
only if the test object terminals are grounded.
When disconnecting, always disconnect cables from the test object terminals first and
then from TRT03. Additionally, measuring cables can be disconnected from TRT03 first,
but only if the test object terminals are grounded.
The grounding wire PE should be disconnected last.
Not following these instructions may cause life-threatening situations.
Cable test leads are terminated with the specially adjusted clips. The colors and markings of the test cables
are shown in the Table 1.
IEC Test
ANSI
Lead
Test Lead
Marking
Marking
1N
H0
1U
H1
1V
H2
1W
H3
2N
X0
2U
X1
2V
X2
2W
X3
If the primary neutral connection does not exist, the 1N (H0; N) lead should be left isolated from the
transformer (i.e. the test object) and from the other connection leads. It must be placed in such a way that it
is completely isolated from other connections or earth. No personnel should be in a position to touch it!
To maximize the accuracy and measurement repeatability, make sure all clamps have a good connection to
the test object and avoid any crossing between the measuring cables.
If the three-phase transformer has a tertiary winding, it should be tested the same way as the secondary.
The transformer is energized using the high voltage windings. Test leads 2U, 2V, 2W and 2N (X1, X2, X3
and X0; a, b, c and n) are in this case connected to the tertiary winding of the transformer.
M-T003NN-205-EN
Table 1: Test lead colors and markings
Australian
Transformer
Test Lead
Terminal
Marking
Voltage
N
Neutral
A
High
B
High
C
High
n
Neutral
a
Low
b
Low
c
Low
8
Australian
Test Lead
Test Lead
Color IEC
Colors
Blue
Black
Red
Red
Black
White
Yellow
Blue
Blue
Black
Red
Red
Black
White
Yellow
Blue
Getting Started
Malaysian
Test Lead
Colors
Black
Red
Yellow
Blue
Black
Red
Yellow
Blue