Mitsubishi Electric SSD and our customers demand an integrated approach to substation operation. That includes the adequate analysis of performance in five areas; voltage control, system protection, substation reliability, energy distribution and thermal performance. Mitsubishi Electric has long been associated with high quality performance and striving to achieve the best customer service. In examining how we accomplish this technically for any customer substation, it comes down to the protection of these five attributes for our customers.
GIS Condition Based Monitoring
The GIS design life is 40 years, but with adequate maintenance and monitoring, a GIS lifespan can be doubled. Many of the components at risk for aging degradation, like O-rings, insulators, arc contacts and nozzles, are enclosed within metal tanks, making it difficult to inspect and diagnose externally. This makes adequate maintenance difficult.
Condition-based monitoring sensor systems can diagnose the health of the components and enhance your GIS maintenance plan.
Condition Based Monitoring Goals
- Reduce failure risk
- Adequate maintenance and condition monitoring are effective to reduce the risk of failure throughout the service life.
- Extend service life
- GIS design life is said to be 40 years. With adequate maintenance and condition monitoring, it could be extended for another 30 years (e.g. 60 years).
- Reduced life cycle cost
- Unnecessary maintenance work can be avoided
- Take full advantage of the initial investment by long term use
- High quality power supply with minimized risk of blackout
Gas Monitoring System
The Gas Monitoring system provides users live data on SF6 gas densities for an entire gas insulated substation in an intuitive manner, historic gas density data, as well as information on when gas alarms are expected (for facilitating predictive maintenance programs). The Gas Monitoring System is comprised of three main components.
Gas instrumentation and I/O devices
The gas density instrumentation utilizes an in-situ detection element for obtaining a real-time and continuous gas density measurement. The instrumentation is connected to a ruggedized automation controller which then conveys the density measurements to the computer hosting the HMI software and Historian software packages.
The software is used to present the real time data on a computer screen either locally or remotely (if applicable). The HMI displays consist of elements (for example, data tables and/or a depiction of the substation one-line diagram) that are used for visualizing the present status of the gas zones being monitored.
The HMI contains a full-featured alarm system
Common HMI principles are used to show alarm conditions (i.e. yellow for low alarms and red for low-low alarms or lockout)
Viewport Cameras for GIS Substations
The Viewport Camera System is designed for simplicity and intuitive operation, and provides the ability of safe viewing of all switch locations.
The viewport camera can be an essential part of viewport observation, both locally and remotely. It allows the customer to view the DS/GS switches for confirmation that a switching event did occur. SSD provides cameras in three product offerings:
- Handheld camera that can be directly applied to the view port.
- Local display cameras connected via a homerun cable to display. These are mounted easily using the same wing-nuts that would normally attach the viewport cover. Green LED indicators provide visual proof to insure the correct viewport is being witnessed.
- Networked display cameras that are identical but are connected to the LCC, control room or elsewhere via an Ethernet/IP network with HMI interface..
Thermographic Camera Substation Monitoring System
Provides near real time analysis of any available telemetry data via the display of an operational, dynamic temperature baseline and any anomalies where data may deviate from that baseline. The ability to define “virtual probes” for equipment analysis is easily accomplished by selecting any pixel within a spec.
Thermographic sensor data can also be color coded, as defined by the user, to create appropriate performance thresholds for “at a-glance” insight into equipment health. Furthermore, a tabular data table logs max, min and average data statistics (in this case temperature) at user defined intervals to calculate an operational baseline and show any deviation from it. In total, these attributes result in operators being able to use the system for early detection of problems and outage prevention within cameras field of vision.
High Voltage testing (Hi-Pot) is a method to check to insure no current will flow from one point to another point. Hi-Pot testing checks for good isolation and dielectric characteristics. It is designed to verify that the insulation of a product is adequate enough to withstand high voltage that will be applied..
- Used for testing the insulation of switchgear and cables in your GIS.
- Using Phoenix Technologies Mobile test equipment, owned by Mitsubishi Electric, we have the ability to conduct testing up to 1000KV