Tecsystem supplier in Romania

For Tecsystem we quote the T154 and NT935 AD units for dry-type transformers, NT133-3 for oil transformers, NT538 AD for motors and the BAR fan bars; we need the unit code, the number of Pt100 sensors and the auxiliary voltage.

Headquarters: Corsico, Italy

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Who is Tecsystem and what does it make?

Tecsystem manufactures electronic temperature monitoring units for transformers, motors and generators, together with forced ventilation systems and Pt100 and PTC sensors. The unit reads the winding temperature and operates alarm, trip and fan-start relays. For a quotation, send us the code of the unit installed in the cubicle, the number of sensors and the auxiliary voltage available.

For dry-type and cast-resin medium-voltage transformers, the basic unit is the T154: four Pt100 inputs, three for the phases and the fourth for the core or for ambient temperature, plus four dry-contact relays for ALARM, TRIP, FAULT and FAN. The NT935 AD has a dual display and the VOTING function, and it transmits temperatures remotely, while the relay thresholds can also be changed remotely. For high- and medium-voltage oil-filled power transformers, the NT133-3 works with a dual Pt100 input for redundant control, three inputs for current transformers, relays for the fans and for the oil circulation pump, and a Modbus RS485 output. These units accept a universal supply, from 24 to 240 V AC/DC.

For electric motors and dry-type transformers, the NT538 AD has eight input channels and five relays, including control of two ventilation stages. Cooling of dry-type transformers is completed by the BAR 400, BAR 600 and BAR 800 tangential fan bars and by the VRT200 and VRT600 control units. The equipment is designed and manufactured in Corsico, near Milan. When a unit fails in a transformer substation, the replacement part must keep the number of channels and the relay functions, so that the wiring in the cubicle does not have to be redone.

What do we supply from the Tecsystem range?

Product	Description
T154	Microcontroller-based unit for medium-voltage dry-type and cast-resin transformers. It has four Pt100 inputs, three for the phases and one for the core or ambient, and four dry-contact relays: ALARM, TRIP, FAULT and fan start. It has a universal supply, from 24 to 240 V AC/DC.
NT935 AD	Monitoring unit for dry-type transformers, built on the new Tecsystem platform, with a dual display and the VOTING function. It transmits temperatures in real time over remote communication and allows the relay intervention thresholds to be changed. The NT935 BASIC variant, code 1CN0131, has no analogue or digital outputs.
NT133-3	Unit for high- and medium-voltage oil-filled power transformers. It works with a dual Pt100 input for redundant control and three universal inputs for current transformers, and has relays for ALARM, TRIP, fans, oil pump and FAULT, plus a Modbus RS485 output.
NT538 AD	Unit with eight input channels for temperature monitoring on electric motors and medium-voltage dry-type transformers. It has five dry-contact relays, ALARM, TRIP, FAULT, FAN1 and FAN2, a dual display and the VOTING function. The NT538 BASIC variant has code 1CN0156.

Why Tecsystem?

Thermal protection for dry-type transformers — the T154 monitors the three phases and the core with Pt100 sensors and has separate relays for alarm and trip
Redundant control on oil transformers — the NT133-3 uses a dual Pt100 input and three inputs for current transformers
Ventilation control — the FAN relays start the tangential fan bars, and the VRT200 signals faults through LEDs and a FAULT relay
Universal supply 24–240 V AC/DC — the same unit can be installed in cubicles with different auxiliary voltages
Integration into substation supervision — the NT133-3 has a Modbus RS485 output, and the NT935 AD transmits temperatures and receives thresholds remotely

Which Tecsystem codes and series are requested most often?

Code	Description
T154	Temperature monitoring unit for dry-type transformers, 4 Pt100 inputs
NT935 AD	Unit for dry-type transformers, with dual display and remote communication
NT935-IR AD + TIR409	Temperature monitoring system for dry-type transformers
T119	Temperature control unit for dry-type transformers
T119 DIN	Unit for dry-type transformers, DIN rail mounting
NT133-3	Unit for oil-filled power transformers, with dual Pt100 input
TPL 503	Temperature control system for oil transformers
NT538 AD	8-channel unit for motors and dry-type transformers
T412	Temperature monitoring unit for electrical machines
VRT200	Control unit for forced ventilation of the transformer
BAR 600	Tangential fan bar for dry-type transformers

Where is Tecsystem equipment used?

Electricity distribution — substations with medium-voltage dry-type transformers
Power generation — oil-filled power transformers and generators in power plants
Heavy industry — high-power motors monitored over several temperature channels
Commercial and office buildings — indoor substations with dry-type transformers
Generating sets — monitoring of generator winding temperature

How do we supply Tecsystem in Romania?

We can quote Tecsystem units for dry-type transformers (T154, NT935 AD, T119), for oil transformers (NT133-3) and for motors (NT538 AD, T412), Pt100 and PTC sensors, extension cables and tangential fan bars. To choose the right part, we need the order code from the existing unit, the number of sensors, the auxiliary voltage and the outputs you actually use. We import Tecsystem units from Italy, made to order, usually in 1–4 weeks, and 24–72 h when the item is available locally or at the supplier.

Setting the alarm and trip thresholds at commissioning is outside our quotation and is done by the team operating the substation.

Frequently asked questions about Tecsystem

What does Tecsystem manufacture?

Tecsystem manufactures electronic temperature monitoring units for dry-type transformers, oil transformers, motors and generators, such as the T154, NT935 AD, NT133-3 and NT538 AD. The range also includes tangential fan bars for cooling transformers, VRT control units and Pt100 and PTC sensors with their extension cables.

How do I choose the Tecsystem unit for a dry-type transformer?

We start from the number of sensors and the functions required. The T154 covers four Pt100 points with ALARM, TRIP, FAULT and FAN relays, the NT935 AD adds a dual display, the VOTING function and remote transmission of temperatures, and the NT538 AD has eight channels. Please also tell us whether the substation system uses Modbus or only contacts.

How soon can we get a Tecsystem unit in Romania?

A Tecsystem unit ships to you in 24–72 h when the item is available locally or at the supplier; ordered from Italy, it usually arrives in 1–4 weeks. For ventilation systems, depending on the brand and the specifications, the lead time may be longer; we state the exact lead time in the quotation.

Can I replace a T154 unit with an NT935 AD?

Both work with Pt100 sensors on dry-type transformers; the NT935 AD adds a dual display, the VOTING function and remote communication. To check whether the change can be made without modifications in the cubicle, we need the code of the old unit, the wiring diagram, the relays in use and the type of output required by the supervision system.

What details do I send for Tecsystem sensors and fans?

For sensors we need the type (for example PTSW, PTO or PTC), the cable length and the mounting position in the winding. For ventilation, we need the bar length (BAR 400, 600 or 800), the motor voltage and the existing control unit, VRT200 or VRT600. With these details we prepare the quotation by part.

How do I request a Tecsystem quotation?

Send the Tecsystem code from the nameplate and the quantity; we reply in English with availability and the lead time written in the quotation.