GE Kelman MULTITRANS - INTRODUCTION; 1.1 Product Overview

MA-003 – MULTITRANS User Guide – Rev 3.0 18-Jan-16 Page 5 of 30
1 INTRODUCTION
1.1 Product Overview
The MULTITRANS™ (herein referred to as the product) is an on-line DGA (Dissolved Gas
Analysis) system for transformer diagnostics. It is designed to monitor up to three
separate oil tanks or a bank of three single-phase transformers in close proximity. The
product measures the following key fault gases in the transformer oil: hydrogen,
methane, ethane, ethylene, carbon monoxide, carbon dioxide and acetylene. In
addition the product also measures oxygen, nitrogen as well as moisture in the oil and
the transformer load current. Such data provides insight on transformer condition
criteria, such as developing faults, paper degradation and electrical arcing. Once
installed, operation is straightforward. All results are stored within the product, but can be
downloaded to a PC for analysis.
The key features and characteristics are summarised as follows:
 Utilises dynamic headspace sampling to extract target gases from the oil sample.
 No consumables, such as carrier gases are required.
 Accurate results are available as often as once per hour.
 Minimal maintenance*.
 Uses highly accurate and stable Photo-acoustic Spectrographic technology.
 Fully embedded microprocessor with non-volatile internal memory storage for
10,000 records.
 Stainless steel outdoor-rated IP55 enclosure connected to the transformer by
robust stainless steel tubing.
 All gas sensing is carried out internally – no external gas sensors.
 Transformer load tracking is available.
 Six user-configurable relay contacts based on absolute gas and moisture values.
 Two user-configurable sunlight-visible LED arrays on the exterior of the enclosure –
one red for alarm, one yellow for caution.
 Two standard sunlight-visible LED arrays – green for power, blue for service.
 Communication options include: Ethernet, RS-232, Cellular modem (GSM/GPRS),
PSTN modem, RS-485 and Fibre Optic. Other options may be available on request.
 Internal USB connection provided for commissioning and service, or local data
download.
*Note: The only recommended maintenance is periodic cleaning of the air filters, in-line oil filter and
battery replacement.
1.2 Manual Scope
This guide outlines the use of the LCD panel, manual DGA sampling function and general
maintenance activities.