Protective devices

Safety for your transformer

All transformer operators face the challenge of protecting the equipment from unpredictable threats. Installing protective devices for early warning and, if necessary, emergency shut-down in case of problems in the transformer not only protects the equipment, but can also extend its operating life.

Protective Relay RS2001

The protective relay RS2001 is designed to protect on-load tap-changer and the transformer during a malfunction within the on-load tap-changer or the…
+ RS2001 specially designed for MR tap changer
+ Protection degree IP 66
+ Inspection Window

MESSKO® MPREC®

The MESSKO® MPREC® pressure relief device protects distribution and power transformers, electric coils and tap changers reliably and safely in the…
+ Hood with interior micro-switches
+ Opens within 2 ms; closes within 70 ms
+ Suitable for wind turbines

CEDASPE® VP (former ETI VS)

The Pressure relief valve is designed to limit the pressure rise inside a tank, in order to prevent an excessive mechanical stress of the walls. It…
+ It works automatically based on valve setting
+ Electrical switches: from 1 up to 3 (2 contacts each)
+ It features compression spring(s) outside

CEDASPE® VP150-QT/VP150-ST (former ETI VQT/VST)

CEDASPE® VP-150 QT have been specially designed for use on transformers where no external pollution is admitted. It opens when the pressure inside…
+ It works automatically based on valve setting
+ Electrical switches: from 1 up to 2 (2 contacts each)
+ It features compression spring(s) outside

MESSKO® MSAFE®

More than 100 years of experience went into the design of the rugged MESSKO® MSAFE® Buchholz relay. It reliably protects fluid-filled transformers and…
+ Long service life thanks to high-quality materials
+ High operating safety due to helium leak test for oil and gas tightness
+ Protective magnetic switches to prevent false triggering

CEDASPE® EB

Buchholz relays detect faults and minimize the propagation of any damage which might occur within oil-filled transformers. The Buchholz relay senses…
+ BTS - quick delivery on selected variants
+ Waterproof - IP 65 protection degree
+ Large inspection window

CEDASPE® ET

Buchholz relays detect faults and minimize the propagation of any damage which might occur within oil-filled transformers. Short circuit faults such…
+ Waterproof - IP 65 protection degree
+ Large inspection window
+ Inlet diameter: 25 mm, 50 mm, 75 mm and 100 mm

RR Series Buchholz relay (former ETI)

Buchholz relays detect faults and minimize the propagation of any damage which might occur within oil-filled transformers. Short circuit faults such…
+ Flow vane disengaged from the lower float: separate contacts (up to 6)
+ Independent switches for the upper and lower float and flow vane
+ Mechanical test button to test independently the three sets of switches, also remoted to man level

GQ Series Buchholz relay (former ETI)

Buchholz relays detect faults and minimize the propagation of any damage which might occur within oil-filled transformers. Short circuit faults such…
+ Flow vane disengaged from the lower float: separate contacts (up to 4)
+ Independent switches for the upper and lower float and flow vane
+ Mechanical test button to test independently the three sets of switches, also remoted to man level

CEDASPE® DAROC (former ETI)

The DAROC oil check valve is designed to prevent the oil contained in the conservator from flowing out when a leak occurs and, for Series EDS-R, to…
+ The most accurate and reliable device in the market: It prevents loss of conservator oil in case of tank leakage
+ Its operation is completely automatic
+ Optional remote reset ensured by an addition by-pass pipe

MESSKO® MSAFE® Gas Sampler

These gases can be used for a specific analysis to provide information on the status of the transformer or on-load tap-changer. When installed at a…

CEDASPE® RG3

The CEDASPE® RG3 body is made of aluminum alloy casting with a large inspection window with a graduated scale. CEDASPE® RG3.2 is equipped with a…
+ BTS - quick delivery on selected variants
+ Large inspection window
+ Suitable for gas analyzer devices

CEDASPE® R1/R2

CEDASPE® R series is spring-inside-the-tank pressure relief valve without contacts, for distribution oil-immersed transformers. It opens when the…
+ Shutter diameter: 1 and 2
+ Operating pressure: from 15 kPa up to 70 kPa
+ Wiring diagrams availability: no contacts

CEDASPE® CPR3

CEDASPE® CPR is a protective device specially designed to detect failures in the rubber bag with the risk of air getting inside the conservator. The…
+ BTS - quick delivery on selected variants
+ The first smart element in case of rubber bag failure. Conservator application
+ Waterproof - IP 65 protection degree

CEDASPE® OC

CEDASPE® OC is a protective device specially designed to detect potential gas generation inside the tank and is suitable for hermetically sealed…
+ Waterproof - IP 65 protection degree
+ Large inspection window
+ Inlet diameter: 38 mm

MESSKO® Test Pump

Checks the correct operation of the upper contact system (alarm) of the MESSKO® MSafe® Buchholz relay by air injection. Direct use on the Buchholz…

MESSKO® Gas Quick Test

Fault gases can be detected easily, quickly and safely with the quick gas test. Based on the color change of the indicators integrated into the glass…
+ Quick fault gas detection
+ No use of separate chemicals

MESSKO® MPREC® test bench

The mobile MESSKO® MPREC® test bench checks and logs the accuracy and function of new and used pressure relief devices. It offers added convenience…
+ Use in the lab, in the test field, during commissioning or during maintenance
+ Simple and safe handling
+ Self-explanatory software and evaluation
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