MeSSKO MTraB MaINTeNaNCe-Free dehydrating BreaTher OF The PreMIUM SerIeS TWICe as reliable and SIMPlY effective.

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1 MeSSKO MTraB MaINTeNaNCe-Free dehydrating BreaTher OF The PreMIUM SerIeS TWICe as reliable and SIMPlY effective. M es SKO IN S Tr U M e NTS

2 MeSSKO MTraB PreMIUM SerIeS MeSSKO MTraB PreMIUM SerIeS The WaY TO asset MaNageMeNT. longer and longer operating times coupled with constantly growing current densities for power transformers have led to continuously increasing demands on quality and the reduction of life cycle costs of transformers and equipment. Conventional dehydrating breathers, which are still filled with silica gel or similar drying agents, are still in use in many places today for typical applications (transformers, on-load tap-changers or industrial processes). The absorbing capacity (hygroscopicity) of the drying agent is exhausted after 3 to 12 months depending on the type of application, and the drying agent must then be replaced. The periodic visual inspections and the regular replacement of the drying agent represent a significant cost factor. The MeSSKO MTraB maintenance-free dehydrating breather is the perfect solution to this problem. The silica gel in the silica gel chamber is dehydrated by a sensor-controlled heater element that is installed. This minimizes the visual inspections, and the expensive, regular replacement of the drying agent is no longer necessary. With more than 14,000 installed units since its introduction to the market in 2003, the MeSSKO MTraB dehydrating breather has contributed to the significant reduction of the life cycle costs for many customers around the world. In addition, a transformer s total operating reliability is increased since there is no more risk of moisture penetration if the conventional dehydrating breather is replaced too late. MESSKO MTraB DB100 and DB200D-T with filter heater, installed in Canada since 2006 Features / Options l Controller (α, β and γ) adjusted to application-specific model of the devices (see table of applications) l din flange for optimal mounting l Test button for performing self-tests l Filter heater for use down to 50 C (optional) l data logger for recording of important MeSSKO MTraB events (optional) l Offshore model with special flange, lacquered connection box as per protection class C5-M and stainless steel cable gland (optional) MESSKO MTraB DB200

3 The principle of operation: simple and effective. During normal operation, the air flowing to the oil conservator is guided over the drying agent (silica gel) which then dehydrates the air. The degree of air moisture in the pipe is measured continuously with a moisture sensor and the results are forwarded to the electronic controller. If the moisture content (% rf) of the air in the pipe exceeds a certain specified value, the self-regulating heater element in the silica gel chamber is activated. The water vapor escaping from the silica gel condenses on the specially designed bottom element and drips out of the stainless steel filter. The temperature sensor is used by the controller to monitor the correct operation of the heating element. An additional heating system (optional) can also be used to prevent the filter system from freezing when outside temperatures are low. MESSKO MTraB DB100 Test button The measured temperature value of the pipe line (dehydrating breather) is output by the controller as an analog signal. Malfunctions of the controller or the heating system are indicated on a fail-safe, continuously powered contact. Many power companies have started retrofit programs and are replacing conventional dehydrating breathers with the MESSKO MTraB. The MESSKO MTraB is the perfect solution for these retrofit projects, because it is available in many different flange designs! MESSKO MTraB stainless steel filter and filter heater Comparison: MESSKO MTraB PREMIUM SERIES The visual checks can be reduced to a minimum and performed together with other inspection and maintenance work Massive cost savings since the expensive, regular replacement of the drying agent is no longer necessary Sensor-controlled heating up of the silica gel; control via moisture and temperature sensors No environmental pollution or disposal problems because of old drying agents More efficient dehydration due to larger contact surface and the physical setup Maintenance-free system; increased operating reliability Conventional dehydrating breather Regular visual inspections to check the degree of moisture of the drying agent during the entire operating lifetime of the transformer Regular replacement of the drying agent during the entire operating life of the transformer Tremendous costs due to frequent refilling of the drying agent, in particular in areas where humidity is always high Environmental pollution and problems with disposal because of old drying agents Less efficient dehydration Big problems when maintenance is not performed

4 The right MeSSKO MTraB PreMIUM SerIeS TYPe FOr every application. α-controller*): recommended for use on on-load tap-changers, arc suppression coils and traction transformers. The dehydrating breather is only heated when needed (its state is monitored for hydration). β-controller*): This is a self-learning system which is recommended for use on transformers with cyclical loads (see table of applications). In addition to monitoring the hydration, a time window is determined during which the oil conservator exhales, and the dehydrating chambers are regenerated. γ-controller*): recommended for special applications such as cavern transformers, furnace transformers and gsu transformers with non-periodical breathing behavior. If the moisture content of the air flowing in the direction of the transformer exceeds a specified value, the silica gel chambers are regenerated in sequence. MESSKO MTraB DB200G Application MESSKO MTraB PREMIUM SERIES Controller* Tap changers db100 α Arc suppression coil (Petersen coil) db100 α Air-filled junction box db100 α Traction transformers db100 α Network transformers 40 MVA db100t β Network and generator step-up transformers > 40 MVA 200 MVA db200t β Generator and network intertie transformers > 200 MVA db200d-t or 2 x db200t β Phase shifting transformers 40 MVA db100t β Phase shifting transformers > 40 MVA 200 MVA db200t β Phase shifting transformers > 200 MVA db200d-t or 2 x db200t β Shunt reactors 40 MVar db100t β Shunt reactors > 40 MVar 200 MVar db200t β Shunt reactors > 200 MVar db200d-t or 2 x db200t β HVDC transformers db200d-t or 2 x db200t β Furnace transformers db200g γ Cavern transformers db200g γ GSU transformers db200g γ

5 The MESSKO MTraB data logger. The MESSKO MTraB data logger lets you record the functional progression of the dehydrating breather (including the silica gel regeneration process) and thus also the air exchange of both the transformer and the on-load tap-changer. This information can then be read on a mobile computer. You can use the included software to evaluate the data and further optimize operational readiness and life span of the transformer. MESSKO MTraB control unit with data logger MESSKO MTraB PREMIUM SERIES Material Flange connection Technical Data All outside parts resistant to weather, transformer oil, salt water and UV; Offshore model available on request DIN flange similar to DIN ; customer-specific flanges on request Color Flanges: natural anodized; junction box: RAL 7033 or 7038 Setup Ambient temperature Inside and outside Type of protection IP 55 as per EN Weight Drying agent Self-monitoring Terminal box Junction box Cable glands Connection terminals Status indication Analog output Output Output signal Fault signal Load Load influence HT-Version Filter heater 0 to +80 C (alternative for HT version: -50 to +80 C) DB100: approx. 8 kg; DB200: approx. 12 kg; DB200D: approx. 28 kg; DB200G: approx. 31 kg Colorless, non-poisonous silica gel 1 x signaling relay for regeneration active/inactive; 1 x signaling relay for device error Ventilated and heated to prevent water from condensing 3 x M20 x 1.5 or 3 x 1/2-14 NPT 4 mm 2, AWG (single-wire or flexible with core end sleeve) LED outside: 1 x green LED: power on; 1 x yellow LED: regeneration active; 1 x red LED flashing: device error; LED in terminal box: 1 x yellow LED: anti-condensation heater on; 1 x yellow LED: filter heater on (HT model) -40 to +80 C (temperature of the air in the pipe connection piece) 4 to 20 ma (0 to 1 ma or 0 to 20 ma optional) < 3.6 ma (only for 4 to 20 ma output signal) Max. of 850 Ω 0.01%/100 Ω We recommend the HT version with filter heater for use in cold regions (ambient temperature under -5 C for 20 consecutive days) to ensure function at lowest temperatures (20 W)

6 Messko GmbH gewerbegebiet an den drei hasen Messko-Platz Oberursel, germany Phone: Fax: info@messko.com Please note: The data in our publications may differ from the data of the devices delivered. We reserve the right to make changes without notice. IN2072/07/01 en MeSSKO MTraB PreMIUM SerIeS MS /13 Messko gmbh 2013