Power supply switch automation - APZmini

 
       Distributed construction - central unit and executive elements

       Possibility of MV voltage measurement without using voltage transformers

Design of APZmini automatic unit:

The automatic unit is dedicated for the following switchgears:

• HV, MV, LV equipped with voltage transformers (measuring elements included in secondary circuits 100V);
• MV not equipped with voltage transformers (voltage measurement is realized through reactance insulators);
• LV not equipped with voltage transformers (measuring elements incorporated directly into 0.4kV primary circuits)

Automatic control system construction:

The automatic unit has a distributed construction, based on the following elements:

• One automatic unit APZmini located in any place in switchgear. Its task is to control the ATS automatics;
• From 2 to 5 PB or PB04 relays built in bays of corresponding circuit breakers. Their task is to collect information from particular bay, including control of voltage presence. Their task is to collect the information from the bay, including the control of voltage presence. 

Thanks to application of distributed system it is possible to limit the number of cable connections. PB relays (fulfilling measuring and executive functions) are built in bays of adequate circuit breakers, what in a essential way decreases laboriousness of installation process by eliminating connections between bays of switchgears. For connecting the automatic unit with relays commonly available communication cables with DB9 connectors are used.

The key feature in relation to operation of APZmini is application of the "plug and play" principle. (plug and play) principle. This means that the machine does not require any complicated settings or costly commissioning process. Practically the only parameter that needs to be selected is the operating mode. For each operating mode, all advanced settings are already pre-programmed in the factory.

Advantages of the APZmini

• Attractive price;
• Rich set of performed switching operations. (SZR, SPP, PPZ, AZZ);
• Possibility of making switches for all directions available in the given switchgear system;
• Possibility of cooperation with the superior system. Thanks to that the automatic unit can work as a field controller;
• Built-in event logger;
• Possibility of using additional functions of PB relays (voltage presence indicator, earthing switch interlock) which eliminates necessity of using other devices controlling voltage presence;
• Visualization of circuit breaker status and voltage presence;
• Small dimensions, easy assembly;
• Possibility of working in a distributed system;
• Optional software for remote control of the system via cell phone, PDA (GPRS) or any computer connected to the Internet;
• Extensive reference list - ATS units produced by Energotest are already working in nearly 800 applications in Poland and abroad;
• Certificates of suitability for use in power industry.

All these features make this product successfully applicable in:

• Power plants and combined heat and power plants in simple systems;
• Power plants;
• Industrial plants;
• Public utility buildings (hospitals, banks, etc.)
• Buildings of a higher standard (office buildings, hotels)