Best Practice Guide E& BENDER The Power in Electrical Safety6 High availability - Pumped storage hydro power station Bad Sackingen

Pumped storage hydro power station for public power supply In the field of energy supply, pumped storage hydro power stations are so far the only option from a technical point of view of storing an oversupply of electrical power. When required, the plant can make the excessive electrical power available within a few minutes and thereby contributes, together with other power plants, to a more regular utilisation of the power supply. Pumped storage hydro power stations are of particular importance in the event of large-scale power outages.since, thanks to their black start capability, they can...

Underground hydro power station Sackingen General: Eggberg reservoir (upper reservoir) Normal water level 700 m +sea level Lowest drawdown level 679 m +sea level Approx. 18 % generation from natural inflows as an average over 10 years

Installation monitoring in an earthed system (TN system) Residual current monitoring system For reliable operation of the electrical installation, periodic verification in accordance with IEC 60364-6 is required. The responsible electrically skilled person determines the test intervals during risk assessment. Recommendations can be extracted from the applicable regulations and standards. For example: ■■ When an installation is maintained by qualified personnel and continuously monitored during operation (e.g. insulation resistance monitoring with a residual current monitoring system), the requirements...

In this case, the residual current device (RCD) with a rated residual current IN of 300 mA offers comprehensive protection. If, in specific application cases, a residual current device (RCD) cannot be used for technical reasons, the directives for damage prevention of property insurers (VdS) recommend the use of residual current monitors (RCMs) acc. to DIN EN 62020 (VDE 0663) with switching devices, e.g. circuit breakers, if their supply voltage is isolated from the supplying system (see: VdS2033). Furthermore, the directives for damage prevention of property insurers VdS3501 recommends that...

Installation monitoring in an unearthed system (IT system) In order to ensure a permanent and highly available power supply of the 20 kV switchgear, the supply voltage was designed as an isolated DC 110 V control voltage supply system. The DC 110 V system is made available via a rectifier and buffered via a battery. A loss of the switchgear control voltage must be avoided under all circumstances. The advantage of an IT system is that it does not have to be disconnected after the first insulation fault. This results in high operational safety and high economic efficiency. By using an insulation...

If an insulation fault occurs in the control voltage supply system of the 20 kV switchgear, the fault has to be located and eliminated as fast as possible. Continuous operation of the plant is absolutely necessary. This is ensured by the installed insulation fault location system, which can automatically start the fault location if an insulation fault occurs. The insulation monitoring device with an integrated locating current injector introduces a limited locating current in the system that can be detected by an insulation fault locator with connected current transformers in the faulty outgoing...

Ready for the future and always connected Robert Schäuble "We were connected at all times." .This was a very important aspect for all responsible employees working in the maintenance department and something to be proud of. From now on, an uninterruptible power supply should also be guaranteed during operation. For Robert Schäuble, Asset Management Electrical Engineering (responsible for all auxiliary installations and supply systems of the Schluchseewerk AG power plants), the advantages of Bender's LINETRAXX regarding the monitoring of a reliable power supply was a decisive factor. Mr. Schäuble,...