SF6 Gas Density Monitoring System
As a result of recent European legislation on the control of greenhouse gases, utilities and manufacturers alike must reduce SF6 emissions to minimal levels, namely, 0.5% per annum. In order to achieve this, and also to prove to the regulatory bodies that this is being achieved, a more accurate inventory system for the SF6 gas in use on substations is required. Siemens has been developing an SF6 Gas Density Monitoring System for a number of years with the aim of having a suitable system in place to meet this requirement.
The Siemens SF6 Gas Density Monitoring (GDM) System has been designed to allow the user a greater degree of flexibility for measurements and alarms than that current provided by gauges with contacts. The system uses SF6 Density transducers which operate with a 4 to 20 mA current loop technology for high noise immunity. The transducers can be mounted directly to the GIS chamber via an industry standard gas 'top-up' connection or retrofitted to gas monitoring boxes housing SF6 gas pressure gauges where ease of access is a requirement.
The transducers are connected via twisted pair, shielded cable to GDM Node Units, installed within the GIS HAll. Up to 45 Density transducers (sufficient for 3 to 4 bays of 420kV GIS) can be connected to each GDM Node Unit which houses the data acquisition and storage facilities. The Node Units are connected ia fibre optic communications cable to a central GDM control cublicle where an HMI is available to provide access to he data and where alarm data is automatically generated. Multiple Node Units can be connected to the central GDM Control Cublcle to provide adequate coverage for every size of GIS substation.
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Siemens GDM System Infrastructure