E+C August 2018

round up

TRANSFORMERS + SUBSTATIONS

Innovative DGA monitors enter the Southern African market

DGA monitors are designed with few me- chanical parts for maximum operability and are virtually maintenance free with no calibration required. It is also quickly and easily installed on the transformer with only one connection point. Another advan- tage is that no carrier gases are required for this or any of the Hydrocal range, pro- viding hassle-free operation for up to 12 years. The Hydrocal 1004 genX unit has a touchscreen display, which is protected from the elements and has communica- tion protocols (MODBUS, IEC 61850 and DNP 3.0) to facilitate wireless operation via a dedicated modem. It can also be connected directly to SCADA systems, an electronic dashboard, a smartphone, note- book or tablet, thereby providing remote access. Enquiries: Martec. Tel. +27 (0) 11 848 6940 or email 1@martec.co.za

With over 5 000 Hydrocal units in- stalled globally, the MTE product range covers economical single gas and mois- ture monitors for smaller transformers right through to multi-gas (nine gases plus moisture) for larger, more criti- cal transformers. The newest product in the

Launching in Southern Africa are the range of online transformer DGA monitors from Meter Test Equipment (MTE) AG of Swit- zerland, distributed in Southern Africa by Martec, a Pragma Group company.

range is the Hydrocal 1004 genX, measuring three gases in oil (Hydrogen H 2 , Carbon mon- oxide CO and Acetylene C 2 H 2 ) as well as moisture. The Hydro- cal units have a unique design which combines a copolymer membrane for the extraction of gas from oil and Near Infra-Red (NIR) spectroscopy for the measurement of dissolved gas- es in transformer oil. Moisture content is directly measured in oil through a capacitive sensor. The Hydrocal range of On-Line

20 Electricity + Control

AUGUST 2018