S.T.E. S.r.l.
Via Cavour, 66 - 20865 Usmate-Velate (MI)
Tel.: 039-68.29.450 - Fax: 039-68.29.455
Cap. Soc. € 110.000 i.v. - Tribunale Monza 21325
C.C.I.A. 1086796 - Meccanogr.MI040903
C. Fisc. 06271510155 - P. IVA IT00821070968
UNI EN ISO
9001:2015
TVM 38-E INSTRUCTION MANUAL_rev4.docx
Pag. 2 di 4
SCOPE
This is the user’s and maintenance manual for integrators, installer and maintenance personnel of systems
based on TVM/38-E voltage transformer. Observe the provisions of local legislation regarding the competence
criteria for personnel working with or in vicinity of electrical installations.
INTRODUCTION:
Our voltage transformers are compliant with IEC 61869-3 and EN 50124-1 Standard
Our product model TVM/38-E is a phase-earth medium voltage transformer for outdoor installation.
RECEIPT OF THE GOODS:
On receipt of the goods, carefully verify the packing conditions and after unpacking verify the integrity of the
product. If there are damages, a claim must be raised to the forwarder. S.T.E. must be informed as well.
STORAGE:
TVM/38-E must be stored indoor, in not polluted air and with normal level of humidity between -45°C and +75°C.
INSPECTION BEFORE INSTALLATION
Before installation, transformers should be inspected for physical damage that may have occurred during
shipment or handling. Transformers should be dry and the surface of the bushings should be clean.
HANDLING AND MOVING:
Avoid any shocks. Shifting and transport must be done using lifting lugs connected to the M6x16 bolts placed in
the side of the plate (maximum torque 6 Nm). Do not move the transformer using the active parts (like
terminals or insulating silicone).
COMMISSIONING AND INSTALLATION:
SAFETY INTRUCTIONS:
The operations must be done by expert and qualified technicians, respecting the IEC standards and European
safety prescription.
ENVIRONMENTHAL CONDITIONS
Installation can be done outdoor, ambient air temperature must be included between -45°C and +75°C.
WARNING
NEVER SHORT CIRCUIT THE SECONDARY TERMINALS
INSTALLATION INSTRUCTION
Before putting in operation the voltage transformer, check the following points:
1. Always consider an instrument transformer as a part of the circuit to which it is connected, and do not
touch the leads and terminals or other parts of the transformer unless they are known to be adequately
grounded.
2. Always ground the metallic cases, frames, bases, etc., of instrument transformers. One end of the
secondary of the VT should be grounded close to the transformers. However, when secondaries of
transformers are interconnected, there should be only be one grounded point in this circuit to prevent
accidental paralleling with system grounding wires.
