Probes for electrical transformers

GUILCOR has been one of the main French designer and distributor of probes and thermal protectors for dry and oil-filled transformers for more than 30 years. We guarantee high quality products at the most competitive prices.

So whether you need a probe for your power transformer, isolation transformer, voltage transformer, power transformer, distribution transformer, autotransformer, current transformer,... Guilcor provides you with the necessary measuring devices .

The temperature sensors and electrical transformers below are available from stock within 24 to 48 hours. For all questions,
do not hesitate to contact us at +33 (0)2 33 61 16 70

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Temperature probes with high electrical resistance and mechanical durability for measuring the temperature of transformer windings and oil

For your electrical transformers, Guilcor offers resistance temperature probes encapsulated in a metal tube or in a heat-shrinkable tube. 

These measuring devices operate in various temperature ranges from -50°C to +260°C. The most common measuring elements are Pt 100, Pt 1000, Ni 1000, KTY, NTC, PTC, etc... 

The thermal probes that we present to you are most often used to measure the temperature of windings and oil.


Dry transformers

Temperature probes for windings - Temperature probes insulated by a heat-shrinkable tube

Winding and winding probe.png

These are cable temperature probes whose sensitive element is protected by a heat-shrink. These sensors are distinguished by their high electrical resistance, for optimum temperature measurement in the windings (primary and secondary).

Here are the main features of these measurement probes for electric motor transformers: 

  • Measuring element: Pt 100, Pt 1000, Ni 1000, NTC, PTC, KTY, or other on request
  • Operating temperature range: temperature class -20°C to 180°C
  • Connection wires: Teflon FEP or PFA 0,22 mm or on request
  • Electrical resistance: 2.5 kV or higher on request
  • Ingress protection: IP 20
  • Connection: 2 wire, 3 wire or 4 wire

Temperature probe settings and design can be adjusted upon request.

Temperature sensors with protective tube

These measurement probes are distinguished by their high mechanical resistance and their temperature range which can correspond to any type of dry transformer.

The sensors for electrical transformer with protective tube have the

 following specifications: 

  • Detection element: Pt 100, Pt 1000, Ni 1000, NTC, PTC, KTY, other as requested
  • Measurement range: temperature class -50°C to 250°C
  • Connecting wires: Teflon APFA
  • Dielectric strength: 3 kV or on request
  • Protection class: IP 67
  • Connection: 2 wire, 3 wire or 4 wire

The parameters and design of the measuring device can be adjusted on request.

Bimetallic thermal protectors for transformer winding

Due to their good resistance to pressure, bimetallic switches can be installed on or in the winding of electrical devices. 

Some bimetallic strips have an uninsulated metal case and are energized. They are used in areas that are already sufficiently isolated or where no enclosure insulation is required.

ST01U1 type bimetallic strips are isolated by assembling a Kynar, Mylar (≤ 130 ° C) or Nomex (≥ 135 ° C) heat-shrinkable tubing. The switches have high voltage resistance up to 2 kV at 50Hz AC and 1min. as well as protection class I VDE. They are particularly suitable for installation in windings of transformers and coils.

Oil bath electrical transformer

Standard probes for temperature measurement of oil-filled transformers

These are resistance temperature probes with stainless steel tube and connection head. Their thermal resistance is variable according to your needs. 
The protection index of the sensors can go up to IP 68. 
The design of these measuring instruments depends on the application. It can be with smooth metal tube, with thread, temperature sensors with connector, etc... 
Regardless of the model selected, our temperature probes offer the greatest resistance to shock and vibration.

TECSYSTEM innovation: Your sealed transformer will never be alone again!

Innovation, easy installation, solidity and transparency, these are the characteristics of tecsystem innovation for temperature probes for electrical transformers. 
The conventional electromechanical control devices are replaced by the TPL503 electronic sensor, installed directly on the transformer, capable of monitoring the TEMPERATURE, PRESSURE and LEVEL of the oil.

The innovative TPL503 sensor is connected to the machine by a conventional flange.
Data from the measuring instrument is transmitted via an RS485 serial connection to the NT210 K unit, which can be installed directly on the control panel.
This allows all ALARM, FAN / PUMP parameters to be viewed and controlled remotely.