Protection systems for safe operations

Electrical protection systems have to take on the task of damage containment in the event of overloading and/or a fault in the electrical equipment (generators, transformers, auxiliary systems, busbars, outgoing lead and cable units).

Power plants, transmission systems (grids and grid components) and electrical consumers have varying equipment items with different levels of priority. Many years of operating experience form the basis for sizing and choice of equipment, and also define the respective protection “philosophy” in each case.

In modernization of protection systems in existing plants, versatile and flexible equipment and systems should provide optimum solutions, both technically and economically.


HIPASE-P is a perfect solution for powerful generator and transformer protection designed for different frequencies (50 Hz, 60 Hz and 16.7 Hz).

The structure of the protection functions is modular and may be customized. Based on the long-term experience with the DRS protection device family of ANDRITZ Hydro the proven numeric algorithms are used and modified to the new requirements in the power generation.

For HIPASE-P a special application board has been developed to generate or process analogue signals for specific protection functions.

Examples for these protection functions are:

  • Rotor earth fault protection
  • Stator earth fault protection by
  • signal injection method
  • Shaft current protection
  • SFC protection
  • Temperature measurement, etc.

Using the compact housing (half size 19”), up to 32 digital inputs and 36 outputs may be processed. For more comprehensive applications with a larger amount of digital input and output signals, a full size 19” housing is used. Generator protection requires numerous functions which are needed for advanced applications like pump turbines or even large thermal blocks.

The HIPASE Engineering Tool supports the protection engineer with proven tools such as software trip matrix, test inputs for the protection functions or simple interface testing.

The engineering of protective functions can be done with the help of a simple selection of all available HIPASE-P functions.
With this action all required steps for the engineering will be fully automatically generated. This includes even the creation of process displays.

In addition, a parameter window for a simple parameter setting is available.

Contact us

Contact us

Do you have questions, please send us an email or contact your nearest local ANDRITZ partner.


The compact protection relay is applicable in medium-sized and large plants and also provides very comfortable user operation due to local key pad operation and the LCD display, . The modern software structure enables customer-specific function configurations which can cater for specific plant requirements or desired back-up functionality most economically. The compact mechanical construction enables simple installation and speedy commissioning.

DRS Compact2

DRS Compact2


This protection relay with the smallest dimensions is used preferably in small plants, e.g. generators, transformers, etc., but also for feeders, bus-bars, and back-up functions. With the local user interface, it provides comfortable service operation and has the same system features as the higher relay system DRS-COMPACT2A.

The relay models available are configured cost-efficiently for various applications. The device is easily commissioned and therefore also very suitable for industrial use.


The distributed low impedance numerical bus bar protection enables flexible application for almost all possible bus-bar layouts due to the inherent universal concept. A redundant fiber-optic, high-speed interface bus guarantees typical tripping times of 15ms. As with other products of the DRS-family, the DRS-BB provides the same user comfort for local operation and configuration of the field units, and of the central unit via the user interface.  As with all other DRS relays, it also provides for operation from remote control locations.


The digital line differential relay DRS-LLD is a protective device for overhead lines and power cables. Up to 6 line ends can be covered by the scheme. Also, a transformer can be included in the protected area.

The hardware and software are a new and extended version of the well-tried DRS-BB bus bar protection. The design is based on our more than 40 years of experience in the power plant protection division.


The modern 32-bit user software is distinguished by the attributes of high ergonomics and clearness. The intuitive application enables easy configuration of all parameter settings, visualizing of records on faults and events, as well as printed documentation of the complete protective function file data.

Simple access to all protection relays of the plant can be gained via the integrated trans-diagnostics function feature carried out from a higher-order remote control location. This software operates all DRS versions and all relay types supplied.