Partial discharge monitoring
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Partial discharge monitoring
Assetguard PDM (formerly known as i-Con) for HV GIS
Assetguard PDM provides peace of mind regarding the condition of the dielectric strength of the high-voltage gas insulated switchgear. The assurance that the dielectric strength is in a proper state is the key for a safe and reliable operation of the GIS.
Assetguard PDM is based on more than 20 years of experience of on-line UHF (ultra high frequency) PDM measurement and includes OEM experience integrated in product.
Assetguard PDM – UHF Partial Discharge Monitoring System - is the third generation of PD monitoring systems developed for high voltage gas insulated switchgear. Monitoring facilitates measurements by using internal or external UHF sensors. It supports compliance with IEC requirements for high voltage onsite testing using partial discharge monitoring. Beside the UHF transducers, partial discharge monitoring is standardly provided with specially designed optical signal conditioning modules. These modules provide the data input to the data acquisition system in the Assetguard PDM . Each Assetguard PDM is capable of processing data for 48 UHF inputs. Typically, this allows one discharge monitoring product to concentrate and process data for up to four GIS bays. It is also possible to perform partial discharge localization with the application of a Siemens portable DiaLoc product.
1. Why is Partial Discharge Monitoring required if all new installations are very reliable and “maintenance free”?
2. To what brands and types of GIS installation can Assetguard PDM be connected?
Assetguard PDM is most beneficial for GIS installations with a voltage above 132kV. Below this voltage level, the possibility for reliable diagnosis decreases. All brands of GIS can be monitored with Assetguard PDM. The only requirement is that sufficient UHF signals can be received out-side the GIS housing. For this, antenna’s/couplers/sensors should be placed inside the housing, or other dialectical gaps should be available. Dialectical gaps are: inspection windows or non-metallic- and non-earthed barriers.
Note: The placement of PD sensors inside the housing is only possible with new-build installations and during a major inspection when gas-compartments are opened and selected GIS cover plates become exchanged or equipped with PD antennas.
3. What is unique about Siemens Assetguard PDM?
First of all, Siemens installed the first online-PDM system for GIS in the year 1990. By this, Siemens is one of the few players in the field with a significant knowledge base about UHF PD monitoring and is therefore capable to give the best diagnosis available. This knowledge is automatically transferred into the monitoring system, which recognizes most UHF patterns in the field.
Furthermore Assetguard PDM is offered as an integral product of the ISCM solution. Based on this ISCM solution, also remote support is available which complies with the highest security level for IT connections. Therefore we can offer a turnkey solution including a complete system with antennas, installation, support, etc. . As a highlight, Siemens has the knowledge and experience on both - the optimal sensor localization and restrictions on antenna placement due to GIS design limitations of several brands. The turnkey solution also guarantees customers to have a full functional system due to single system responsibility.
4. How can Assetguard GDM be combined with Assetguard GDM in one system?
Assetguard GDM and Assetguard PDM can both be integrated on the same central ISCM platform, as much as any other Assetguard. All information from the integrated Assetguards is visualized at the same interface with a harmonized alarm handling. This avoids redundant monitoring hardware and optimizes the usability of condition monitoring for operatiors and asset managers.