TRT3x Introduction
M-T03XNN-205-EN
5
• Never exchange connections to the HV and LV sides of the transformer. The “H” connections must
always be connected to the High Voltage side of the transformer. The
“X” connections must always be
connected to the Low Voltage side of the transformer. Interchanging any or all of the connections may
result in damage to the transformer or TRT3x and is a significant safety hazard to personnel.
1.2 Power Supply
• Supply TRT3x only from a power outlet equipped with a protective ground.
• Besides supplying TRT3x from phase – neutral (L1-N, A-N), it may also be supplied from phase to
phase (e.g., L1-L2; A-B). However, the voltage must not exceed 264 V AC. Please refer to the section
“Technical Data”.
• TRT3x should be positioned in such a way that it is possible to safely disconnect it from the power
supply at any moment.
WARNING / AVERTISSEMENT
This is a class A product. In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate measures.
Il s'agit d'un produit de classe A.
Dans un
environnement
domestique, ce produit
peut provoquer des
interférences
radio, auquel cas l'utilisateur
peut
être amené à prendre des mesures
adéquates.
1.3 Measurement Category
TRT3x is intended to be used for measurements in Measurement Category I (CAT I) for voltages up to
250V. The device is also designed to withstand occasional transient overvoltage up to 1000Vpk.
WARNING / AVERTISSEMENT
This equipment is classified as measurement category I, and must not be used within measurement
category II, III and IV.
Cet équipement est classée dans la I catégorie de mesure, et ne doit pas être utilisé pendant les
catégories de mesure II ,III et IV.
1.4 Intended Use
The Three-phase Transformer Turns Ratio Tester TRT3x is designed specifically for performing
measurements on power, distribution and measurement transformers as follows:
• turns ratio measurement
• phase shift measurement
• excitation current measurement
These three tests are performed at the same time. TRT3x applies test voltage to HV transformer terminals
and measures induced voltage at LV transformer terminals. The ratio of these voltages is actually the turns
ratio of a transformer. At the same time, TRT3x measures the excitation current at the HV transformer side,
as well as the phase angle between the applied test voltage and induced voltage.
There are three ways to perform the measurements depending on the test object and a test voltage. If the
test object is a single-phase transformer, a single-phase autotransformer or a current transformer, TRT3x
provides a single-phase test voltage to the
transformer’s primary side and measures the induced voltage at
the transformer’s secondary side.
