Customer Services for Transformers
SITRAM
Multisense 9
Monitoring and Diagnostics
Introduction
In their average lifetime of 40 years, transformers endure various forms of stresses that can contribute to a multiplicity of failures (electrical, thermal, chemical or mechanical). Transformer failures may cause e.g. costly damages to primary and secondary equipment, outages, environmental cleanup charges and a loss of reputation.
DGA (Dissolved Gas Analysis) monitoring with SITRAM Multisense 9 helps utilities to avoid transformer failures.
SITRAM Multisense 9 indicates deviations and imminent faults by analyzing the concentration of eight dissolved gases in transformer insulating oil (mineral and ester oil), and moisture. This helps to predict and prevent eight fault types:
·High temperature thermal faults, overheated oil by monitoring C2H4
·Partial discharge, thermal faults, power discharges, rust, galvanized parts, stainless steel, sunlight by Monitoring H2
·Corona partial discharge, low & medium temperature thermal faults by monitoring CH4
·Thermal fault involving cellulose, gradually from oil oxidation by monitoring CO
·Normal aging, thermal fault involving cellulose by monitoring CO2
·Hot spot, low energy discharge, high energy discharge (arc) by monitoring
C2H2
·Low & medium temperature thermal faults, local overheating by monitoring C2H6
·Exposure to atmosphere (air), leaky gasket (under vacuum), air breathing conservator, leaky bladder by monitoring O2
Features
·Robust, NDIR measurement technology without moving parts or reference gas
·Easy installation directly at transformer - One man work
·Display and keypad enabling comprehensive configuration and setup without additional computer
·Easy to understand due to simple setup
·Compact, robust design (IP55)
·High accuracy enabling early diagnostics
·Optional: Various communication options, 13 digital outputs, 5 digital optocoupler outputs
·Optional: 10 analog outputs, 10 analog inputs
·Ambient humidity: 0-95%
·Monitoring functions:
o Voltage and current monitoring (via voltage and current transformers / transducer)
o Temperature monitoring: lower and upper oil temperature, ambient temperature (via additional temperature sensors)
o Cooling stage / tap changer position monitoring (e.g. via current transducer)
o Free configuration of analog inputs, free allocation to any additional sensor
o Calculation of hot-spot (acc. to IEC 60076), loss-of-life, ageing rate
Benefits
·Monitoring of all diagnostic gases inside the transformer oil, enabling recognition of all potential failure types
·Avoidance of major costs due to failures or outages
·Cost savings thanks to scheduled and efficient transformer maintenance
·Uses advanced software (the unit and via PC)
·Maintenance-free system
Scope of work
·Configuration and administration of each individual Multisense unit
·Data and configuration read-out of Multisense units
·Processing and visualization of data
·Read out (trend or table)
·Online functions (Status and process flow)
·Diagnostics functions (Duval triangle)
·Further processing of the data (Excel, CSV, clipboard and printing)
·Storage of the processed data and unit configuration
siemens.com/td-services
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