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The Plan of the Tests of the Stand-by Power Supply in 2025

Obligatory monthly tests of the stand-by power supply-power center are a prerequisite for the operation of a stand-by power supply. As they involve a certain degree of the risk of a possible power-supply interruption, we ask all the staff for understanding this situation and considering whether to secure sensitive electrical equipment by the local UPS during the planned times or to disconnect it during the test.

The tests in 2025 have been set for the following dates and times:

  • Tuesday, January 7, 9:00 AM
  • Tuesday, February 4, 9:00 AM
  • Tuesday, March 4, 9:00 AM
  • Tuesday, April 1, 9:00 AM
  • Tuesday, May 6, 9:00 AM (a power-outage simulation)
  • Tuesday, June 3, 9:00 AM
  • Tuesday, July 1, 9:00 AM
  • Tuesday, August 5, 9:00 AM
  • Tuesday, September 2, 9:00 AM
  • Tuesday, October 7, 9:00 AM
  • Tuesday, November 4, 9:00 AM (a power-outage simulation)
  • Tuesday, December 2, 9:00 AM

The tests will be performed such that at 9 AM an interruption of the Institute’s power supply from the PRE network will be simulated in the power center. The Institute’s burden will be taken over by the stand-by power supply and after ca 15 minutes of the operation of the stand-by power supply, the power supply will return to the PRE network. For more information, please contact Ing. J. Hofman – ☎ 361


How the test will be manifested

A successful test will be practically manifested in the following way:

Buildings A and B
  • The unbacked network (white sockets) will continue to be supplied with power during the test(including a power-outage simulation). If there really is a loss of power supply from the PRE network,the unbacked network will be without power throughout the power-supply interruption.
  • The network backed by the diesel aggregate (red and orange sockets) will continue to besupplied with power during the test (including a power-outage simulation). If there really is a loss ofpower supply from the PRE network, this backed network will have two power-supply interruptions ofseveral seconds. The first will occur in the transition into the diesel-aggregate backup and the secondin the return to the PRE network.
  • The UPS-backed network (green sockets) should not be affected by the tests or if there really is aloss of power supply from the PRE network.

Building C
  • The unbacked network (white sockets) will continue to be supplied with power during the test. Ifthere really is a loss of power supply from the PRE network and during a power-outage simulation,this backed network will be without power throughout the power-supply interruption.
  • The network backed by the diesel aggregate (red and orange sockets) will have two power-supply interruptions of several seconds both during the test and if there really is a loss of powersupply from the PRE network. The first will occur in the transition into the diesel-aggregate backupand the second in the return to the PRE network.
  • The UPS-backed network (green sockets) should not be affected by the test or if there really is aloss of power supply from the PRE network.

Building D
Building D is mains-powered backup UPS network - the examinations and the real power loss of the Prague power grid should not be reflected.

Wastewater treatment plant
Wastewater treatment plant is connected to a network backed by a diesel aggregate. During the tests and if there really is a loss of power supply from the PRE network, there will be two power-supply interruptions of several seconds. The first will occur in the transition into the diesel-aggregate backup and the second in the return to the PRE network.

Entrance Gate
During the tests and if there really is a loss of power supply from the PRE network, there will be two power-supply interruptions of several seconds. The first will occur in the transition into the diesel-aggregate backup and the second in the return to the PRE network.