Gas density monitoring
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Gas density monitoring
Assetguard GDM (formerly known as i-Con) for High Voltage Gas Insulated Switchgear
Assetguard GDM for SF6 gas density monitoring has been designed to allow the user a greater degree of flexibility for measurements and alarms than currently provided by gauges with contacts. The Assetguard GDM can be used as stand alone product or system-integrated as part of the ISCM (Integrated Substation Condition Monitoring) - platform. (for more information click on Asset Data Management).
Assetguard GDM receives its signals from SF 6 density transducers which operate with a 4 to 20mA current loop technology for high noise immunity. The result is a full SF 6 inventory management system capable of providing advanced warning of SF 6 leaks with highest accuracy.
Transducers can be mounted directly to the GIS chamber via an industry standard gas “top-up” connection or retrofitted to gas monitoring boxes housing SF 6 gas pressure gauges where ease of access is a requirement. Each Assetguard GDM is installed within the GIS hall, and can host up to 45 density transducer connections. Each Assetguard houses the data acquisition and storage facilities and can be accessed.
1. What is the difference between Assetguard GDM and the gas density supervision available in SCADA?
Conventional gas density supervision only warns or trips, if a minimal level of gas density has been reached. By then, immediate action is required to remain the installation in operation and SF 6 gas already escaped, contributing to the green-house effect. Therefore an early detection of even small leakages is preferable from many points of view. It allows an early prediction when the installation will trip in case of leakage. Furthermore the system can prove the leakage-freeness, directly after commissioning or after aging of the installation over many years. An additional advantage is that if Assetguard GDM is integrated on the ISCM platform, the information is not only available for operators, but also to asset managers or other maintenance responsible, often to fulfill regulatory requirements.
2. Why is gas density monitoring required if all new installations are “maintenance” and leakage free?
Assetguard GDM adds value in three ways:
3. What is unique about Assetguard GDM?
Assetguard GDM measures with an accuracy of 0,5%. This 0,5% accuracy is highly relevant due to expected leakage rates even smaller than 0,5%. Furthermore, Assetguard GDM is offered as an integral package for the ISCM system, including reporting functionality for inventory management. This makes Assetguard GDM useful for asset management purposes.
4. Is Assetguard GDM expensive?
Each product or system implementation needs a monetary investment (CAPEX). The implementation costs should also cover the management of gas density information in order to receive earnings later on. Taken into account the benefits which other systems do not have (see questions above), the return of investment should be reached easily. Savings in the use of the Assetguard GDM are based on the smart setup of the system. The configuration of all gas chambers can take place centrally (like excel tables), instead of web-based programming, bay per bay. Due to the ISCM approach, Assetguard GDM can be combined with other monitoring solutions like partial discharge monitoring, transformer monitoring, cable monitoring, etc. - without limitation. The investment in an Assetguard GDM system is therefore also an investment in a basic monitoring platform that can be used for other assets as well.
5. What are the requirements for a GIS to install Assetguard GDM?
The GIS gas compartments should have at least one free filling pipe available, normally equipped with a DILO connection. As an alternative, a T-connections can be made available on existing connections.