Upgrading of a standard 110-kV-substation

The switchgear (110kV and 10/20kV) and the ancillary systems were usually installed many years ago. The upgrading of the substations therefore includes the following priorities:
• Upgrading of the drives of all 110kV switchgear on the GIS switch panels.
• Replacement of all secondary cabinets for the 110kV panels.
• Installation of a cabinet to monitor the gas space of the GIS system.
• Replacement of all 110kV protective devices for line protection consisting of main and backup protective devices (including in the counter plants).
• Replacement of all 110/10kV protection devices for transformer protection consisting of main and back-up protection devices in separate cabinets.
• Complete renewal of the secondary expansion of all 10kV switch panels. This also includes the renewal of the 10kV protective devices.
• Upgrading of the motor drives for the tap changers of the 110/10kV transformers.
• Replacement of the cabinets for the automatic voltage regulation including the voltage quality measuring device.
• Replacement of the AC personal requirement systems, consisting of a two-field feed-in and a four-field personal requirement distribution.
• Replacement of the DC system for own needs, consisting of a two-field feed-in and a four-field power distribution system for own needs, a cabinet with a power supply unit for backup protection and a battery system and the modification of the existing battery charging rectifier.
• The complete structure of a substation control system. The SLT system includes the installation of nine control technology cabinets, the equipment of all switch panels with a bay control device, the installation of a PC-controlled operator station in the substation and the Transmission of the signals to the central network control center and to the service workstation.
• Renewal of the entire secondary cabling in the substation (copper and fiber optics).
• Upgrading of the grounding and lightning protection system for the entire substation.
• Upgrading of the air conditioning systems (heating, cooling, smoke extraction).
• Renewal of light and power distribution.
• Structural measures that become necessary due to the construction of the new systems.