Transec Electric
Transec's business focuses on the reliability of transformers – continuously removing water from the insulating oil of a power transformer.
Transec Electric story
Transec Electric is the new name for Transec UK Ltd. which was established over 15 years ago and since 2004 Transec has managed over 3350 Transformer On-Line Molecular Sieve Drying System projects worldwide.

Transec has supplied to over 20 countries including UK, China, India, Germany, South Korea, Australia, Saudi Arabia. UK installations have included UKPN, National Grid, SSE, Scottish Power, EDF Energy UK, EON, WPD and NPG.

Transec Electric Limited will continue to manufacture, support and develop Transformer On-Line Molecular Sieve Drying Systems and Services from its base in Haverhill, Suffolk., UK.

About technology
Since the beginning, Transec's business has been focused on the reliability of transformers, with one of the most important features – continuously removing water from the insulating oil of a power transformer.

Why is it so important?
Power and distribution transformers are some of the most important and expensive assets in a power network. Compared to other equipment, they are very reliable and require very little maintenance since they have no continuously moving parts. However, the insulating materials, being organic, degrade with time in service, and ultimately determine the end of life of the transformer.
In a poorly maintained free breathing transformer water can enter through the natural expansion and contraction of oil as the temperature cycles, but also water is a by-product of the breakdown of the long chain hydro- carbon glucose molecule, as a result of thermal and electrical stress. This leads to degradation of the organic insulation materials as the transformer ages.
Excessive moisture will saturate the insulation and increase its conductivity. At higher temperatures, vapour or free moisture can develop increasing the risk of partial discharge.
TRANSEC is an online molecular sieve, developed and manufactured in the U.K. that is designed to continuously remove water from the insulating oil of a power transformer. As the ppm level in the oil is reduced, water from the solid insulation (where over 95% of the water will accumulate) will migrate from the insulation into the oil to redress the natural equilibrium. This process not only reduces ageing, but will improve the dielectric strength of the insulation, and increase reliability.
TRANSEC online drying system CL series iVersion

1. Frame
2. Inlet ball valve
3. Inlet sampling valve
4. Pump
5. Flow indicator
6. Inlet filter
7. Inlet moisture and temperature sensor
8. Bottom interconnection pipeline between
cylinder and sensor/inlet filter
9. Cylinders
10. Top interconnection pipeline between cylinders
11. Air bleed valve between cylinders
12. Bottom interconnection pipeline between
cylinders
13. Top interconnection pipeline between cylinder
and outlet filter
14. Outlet filter
15. Outlet moisture and temperature sensor
16. Outlet sampling valve
17. Deaerator
18. Outlet ball valve
19. Bleed pipe
20. Deaerator air bleed valve
21. AMi monitoring and control cabinet (MCC)

TRANSEC online drying system CL4 iVersion

1. External enclosure
2. Inlet ball valve
3. Inlet sampling valve
4. Pump
5. Inlet moisture and temperature sensor
6. Flow indicator
7. Flow meter
8. Top interconnection pipeline between cylinder
and sensor
9. Air bleed valve on the first cylinder and air bleed
valve between second and third cylinders
10. Cylinders
11. Bottom interconnection pipelines between
cylinders
12. Top interconnection pipeline between cylinders
13. Top interconnection pipeline between cylinder
and outlet filter
14. Outlet filter
15. Particle filter sensor
16. Outlet moisture and temperature sensor
17. Deaerator
18. Glass gauge
19. Float switch
20. Outlet sampling valve
21. Outlet ball valve
22. Bleed pipe
23. Deaerator air bleed valve
24. WSi monitoring and control cabinet (MCC)

TRANSEC online drying system CL series iVersion
1. Frame
2. Inlet ball valve
3. Inlet sampling valve
4. Pump
5. Flow indicator
6. Inlet filter
7. Inlet moisture and temperature sensor
8. Bottom interconnection pipeline between
cylinder and sensor/inlet filter
9. Cylinders
10. Top interconnection pipeline between cylinders
11. Air bleed valve between cylinders
12. Bottom interconnection pipeline between
cylinders
13. Top interconnection pipeline between cylinder
and outlet filter
14. Outlet filter
15. Outlet moisture and temperature sensor
16. Outlet sampling valve
17. Deaerator
18. Outlet ball valve
19. Bleed pipe
20. Deaerator air bleed valve
21. AMi monitoring and control cabinet (MCC)
TRANSEC online drying system CL4 iVersion
1. External enclosure
2. Inlet ball valve
3. Inlet sampling valve
4. Pump
5. Inlet moisture and temperature sensor
6. Flow indicator
7. Flow meter
8. Top interconnection pipeline between cylinder
and sensor
9. Air bleed valve on the first cylinder and air bleed
valve between second and third cylinders
10. Cylinders
11. Bottom interconnection pipelines between
cylinders
12. Top interconnection pipeline between cylinders
13. Top interconnection pipeline between cylinder
and outlet filter
14. Outlet filter
15. Particle filter sensor
16. Outlet moisture and temperature sensor
17. Deaerator
18. Glass gauge
19. Float switch
20. Outlet sampling valve
21. Outlet ball valve
22. Bleed pipe
23. Deaerator air bleed valve
24. WSi monitoring and control cabinet (MCC)
Operational Principle

TRANSEC extracts moisture from the oil thanks to molecular sieves. An electrical pump circulates the transformer oil through the TRANSEC cylinders containing a large amount of these molecular sieves. The molecules of water dissolved in the oil will remain in the TRANSEC cylinders. Two moisture and temperature sensors are placed at the beginning and end of the system in order to monitor the moisture level of the transformer and to control a proper filtration process. Oil particles filtration and air bubble removal is also ensured during this cycle.

TRANSEC can either be mounted directly on the power transformer or can be installed on a stand-alone frame next to it. Two pipes are connected to the upper and lower valves of the transformer. Every TRANSEC unit includes sample/measuring points at the inlet and outlet.

  • Continuous monitoring of oil temperature and moisture content entering and exiting the TRANSEC unit
  • Increases life expectancy of transformers by drying the insulation paper
  • Maintain a safe transformer with high breakdown voltage
  • Online installation & operation – no shutdown
  • Cost effective solution – 24/7 continuous drying and monitoring
  • No operator required. Stand alone unit LV powered
Options available with TRANSEC
  • External enclosure
    The optional enclosure for the TRANSEC unit will protect the HMI and the hardware from rain, dust, heat from direct sunlight and UV. The enclosure is either made of aluminium or stainless steel.
  • Leak detection tray
    The accessory (only available on the WSi version) will detect any oil leak within the TRANSEC system and will provide the alarm accordingly. It is, of course, strongly advised to combine this option with an external enclosure (to protect from rain) and a solenoid inflow valve in order to block the oil circulation in case of leakage.
  • Inflow controllable solenoid valve
    This valve can be set remotely to operate and block the oil flow in case of leakage or rising temperature.
  • Deaerator glass gauge and switch
    To be sure that no air is entering the transformer, a deaerator is placed at the end of the TRANSEC. For additional protection, it is possible to see the level of air in the deaerator with an optional glass gauge and to have a switch that will signal an alarm if the level of air reaches a dangerous level.
  • Led indicators
    They will allow you to observe:
    - Power on — unit is working
    - CYL 70% sat — cylinders have been saturated up to 70%
    - CYL 90% sat — cylinders have been saturated up to 90%
    - System error — there is a system error that you will see on the HMI screen.

Continuous moisture assessment with the TRANSEC monitoring

Monitoring cabinet AMi
The AMi TRANSEC monitoring cabinet continuously monitors the temperature and moisture dissolved in the oil entering and exiting the TRANSEC. This allows monitoring the good water extraction for the TRANSEC but also the moisture level of the transformer. Alarms can be set, and reports of all data collected can be downloaded.
Monitoring cabinet WSI
The WSi TRANSEC monitoring cabinet provides continuous monitoring of the temperature and the moisture dissolved in the oil entering and exiting the TRANSEC and allows to take action on it. The pump can be stopped under certain conditions. Also, other analyses are provided which will help to better understand the current moisture situation of the transformer and to take action!
Continuous moisture assessment with the TRANSEC monitoring
Monitoring cabinet AMi

The AMi TRANSEC monitoring cabinet continuously monitors the temperature and moisture dissolved in the oil entering and exiting the TRANSEC. This allows monitoring the good water extraction for the TRANSEC but also the moisture level of the transformer. Alarms can be set, and reports of all data collected can be downloaded.
Monitoring cabinet WSI
The WSi TRANSEC monitoring cabinet provides continuous monitoring of the temperature and the moisture dissolved in the oil entering and exiting the TRANSEC and allows to take action on it. The pump can be stopped under certain conditions. Also, other analyses are provided which will help to better understand the current moisture situation of the transformer and to take action!
Product Selection guide
Installations' examples
Installations' examples
Callback form
Clients prefer Transec due to
  • Transec increases
  • Transec dries a transfomer
  • Trances provides easy maintenance of a transfomer without outage
Clients prefer Transec due to
  • Increases life expectancy of Transformers
  • Drying Transformer continuously during operation
  • Easy Transformer maintenance without outage