Protection set

Protection functions are programmed during configuration. The device is programmed by using so called protection library. Protection functions are energized by electrical values obtained by digital filtration of analog signals received from protection transformers.

A typical CZAZ-GT protection set consists of the set of functions listed below:

Protection functions are supported by logic circuits, which are designed using available measuring functions, Boolean operators and timers. It allows to configure advanced automation circuits, for example:

• breaker failure logic, which provides redundancy trip signal of electrical part of power unit in case of failure operation of generator breaker
• control generator excitation system, used in case of occurance of disturbances requiring immediate generator excitation system switch of

Main features

• Number of binary inputs and relay outputs adjusted to the needs of protected unit (up to 320 in or out signals)
• Number and type of analog inputs adjusted to the set of measuring transformers used at particular power unit (up to 50 inputs for each cabinet)
• Possibility to adapt easily protection functions characteristics with biult-in software, designing logical circuits, timers and control algorithms, registers and signalling. The configuration of protection unit is carried out by the manufacturer or authorised representative
• Great flexibility to configure sophisticated protection functions and logic system with possibility to upgrade according to the needs of the customer
• Possibility to group signals in any configuration in order to get logical sum of trip signals
• Trip outputs allowing direct control of unit breakers
• Trip circuit supervision function
• Measuring of electrical values (current, voltage, active and reactive power, frequency, phase shift, resistance, reactance, apparent impedance)
• Event recorder (256 unique events, capacity up to 5000 events, time resolution 1 ms)
• Disturbance recorder:
  • sampling frequency 1800 Hz
  • recording up to 40 analog signals and up to 128 binary signals
  • duration of recorder waveform – up to 500 sec. for one signal (approx. 10 sec. for 40 analog signals and 128 binary signals)
  • memory allows to save up to 32 files of registered disturbances
  • recording of sampled or digital filtered values (e.g. differential currents)
• Optical signalling at HMI (14 LED diodes)
  • auxilliary voltage signalling
  • proper work of unit signalling
  • 12 programmable diodes for signalling other statuses
• expanded self-control system and failure signalling
• two power supply units per each cabinet providing full redundancy
• autonomic communication with local HMI
• remote communication with PC computer or SCADA system (two RS485 ports and one RS232 in front panel)
• free PC software for Windows operating system

TECHNICAL DATA