Czech Republic, Prague

Control and power solutions

Cost effective control package upgrade for back-up system

Description
With the gradual increase in the power consumption of office building, Sazka, the largest lottery operator, raised the requirement to increase the power of the back-up system. Because adding another unit is economically more advantageous than replacing the original, a new 800kVA unit was installed to work alongside the existing 600kVA diesel generator. It is worth mentioning even partial interchangeability of units.
The ComAp system provides full mains and gen-sets monitoring and protection. Single line diagram included a total of 8 electronically controlled breakers. Four breakers were controlled by standard ComAp functions and 4 breakers required customized control created in ComAp internal PLC – totaling in 90 PLC blocks.
System operation was conducted with one user Mode selector switch on the panel door.
Power back-up system provides these functions:
- Standby power
- No break transfer to generators when black-out announced in advance
- No break transfer to mains
- Gen-set soft load test-on-load during normal building operation
- Power supply of critical loads in case of one machine failure

Scope of supply
Stand alone standing control switchboard:
 - DIN rail mounted controllers
 - Mode/operation selector switch
 - Mimic diagram shows real single line diagram with indicators
Replacing of current ATS control system
Installation of ComAp control for original and new additional engine
Installation carried under normal building operation
Installation of power cables for 800kVA

Benefits
- Intuitive use with just 1 selector switch fully automatic operation
- Synchronization achieved in range of seconds. Finetuned on site using ComAp WinScope
- Loadsharing and VAr sharing of different engines sizes + oldschool and top-notch model
- Internet connectivity, system visualized on customized InteliMonitor screen

Gen-set type
Caterpillar 600kVA, 800kVA with EMCP II