BUCHHOLZ-RELAY – PROTECTION SYSTEM MESSKO® MSAFE® FOR TRANSFORMERS

Identifying malfunctions: Protection system for power transformers

Your benefits at
a glance

  • Long service life thanks to high-quality material (mechanical components with a composition of up to 95% stainless steel)
  • High operational reliability thanks to helium leak test for oil and gas tightness
  • Avoids false tripping by using magnetic circuit breaker
  • Maintenance and service-friendly—you can replace switches without having to access the oil circuit
  • 100% retrofittable
  • Solid-body floats

BUCHHOLZ-RELAY FOR TRANSFORMERS: PROTECTION SYSTEM FOR LIQUID-FILLED TRANSFORMERS

How the Messko Buchholz Relay works

The MESSKO MSafe acts as a central protection system for liquid-filled transformers and reactors with oil conservator. Installed in the pipeline between tank and oil conservator, it reacts to faults which occur inside the transformer. Damages which are not visible can be detected early by the Buchholz relay.

Gases moving in the direction of the oil conservator or shock waves created by the rapid gas development trigger the signaling system of the Buchholz relay. The Buchholz relay also takes over the function of an oil level indicator when there is not enough oil in the conservator or when there is an oil leak.

An overview of the advantages of the MSafe

The MSafe® Buchholz relay impresses with its robust construction in which more than 100 years of experience in measurement, regulation and safety technology have been invested. Top-quality materials, high manufacturing quality and the latest testing devices all guarantee the reliability of Messko’s Buchholz relay.,

THIS DISTINGUISHES THE MESSKO BUCHHOLZ RELAY FROM USUAL PROTECTION DEVICES:

Extra function reliability due to the use of solid-body floats

In contrast to frequently used hollow floats, the solid-body floats used by the MSafe cannot fill up with oil and lose their buoyancy. Messko has had long years of positive experience with this material using it for the MTO series oil level indicators.

Helium leak test as guarantee of oil and gas leak proofness

Before being delivered, every single Buchholz relay is checked for leak proofness in addition to a function test. For this test Messko uses helium at its state-of-the-art test stand. This helium leak test guarantees maximum oil and gas leak proofness.

Two or four switching contacts

If desired, the device can be equipped with normally closed, normally open and / or changeover contacts.

Protected Reed switches

The reed switches of the MSafe are separated by immersion pipes from the oil. An oil ingress into the reed switch is therefore impossible. These switches are freely accessible from the terminalbox. Replacement is possible without any interference to the oil circulating system.

Remote testing possibility

At any time the MSafe can be triggered via a compressed air line to test its readyness of operation.

Top-quality, reliable material

95% of the mechanical components are made of stainless steel. An offshore-quality MSafe® is also available as an option.

Accessories for the Buchholz Relay: Gas Sampler and Quick Test

GAS SAMPLER FOR MSafe - BUCHHOLZ RELAY GAS SAMPLING

GAS SAMPLER FOR THE MESSKO BUCHHOLZ RELAY MSAFE®: THE GAS SAMPLER IS USED TO COLLECT THE BUCHHOLZ RELAY’S ACCUMULATED GASES.

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 user-friendly working height, the fault gases can be safely and reliably sampled from the Buchholz relay.Gasentnahme im Buchholz-Relais
It is possible to draw reliable and meaningful conclusions regarding sources of error in the transformer or on-load tap-changer from the analysis results (e.g. MESSKO Gas Quick Test). Messko offers further detailed analyses of the fault gases dissolved in the oil with its MESSKO® PrimeLab® service.

The MESSKO MSafe is connected to the MESSKO gas sampler by means of a special joining system. Copper pipes in various lengths or a PTFE pipe measuring 6 x 1 mm are available at the customer’s request.

MESSKO® GAS QUICK TEST: RELIABLE TESTING OF THE GASES IN THE GAS SAMPLER OR THE BUCHHOLZ RELAY

Gasentnahme im Buchholz-RelaisTHE MESSKO GAS QUICK TEST IS USED TO TEST THE GASES IN THE GAS SAMPLER OR THE BUCHHOLZ RELAY FOR THE PRESENCE OF CARBON MONOXIDE AND HYDROGEN.

The MESSKO Gas Quick Test offers fast, easy and safe identification of fault gases in the field.

It is possible to detect hydrogen (high-energy incident) and carbon monoxide (aging of the insulation material) quickly and reliably based on the colour change of the indicators that are integrated in the glass tubes. [No use of separate chemicals.]
Messko offers further detailed analyses of the fault gases dissolved in the oil with its MESSKO® PrimeLab® service.
 

 


 

 

 

 

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