Breaker sequencing can be used to close breakers in accordance with user specified sequences and time delays such as bringing large motors on-line across several billing kw demand periods to avoid demand penalties. Also breakers can be selectively opened as needed according to user defined priorities, based on monitored power demand values.
These systems can be used for:
- Frequency based control
- Load reduction to match generator supply
- Demand control
- Peak shaving
Services can include:
- Design, configuration,and startup
- PLCs and control logic
- Custom enclosures and wiring diagrams
- Integration with PowerLogic System Manager Software
- Graphic diagrams to match facility
- Paging or custom software
- Sequence of Events Time Stamping
In a properly coordinated power system, protective equipment time settings are the key to power system reliability. Likewise, when automatically controlling power systems, control actions must be synchronized and performed at precisely the correct instance in time. By ensuring global time positioning across the power monitoring system, control actions are not susceptible to typical communication network latency. The synchronized monitoring devices are then enabled to record events within 1 ms providing the exact sequence of events when an incident occurs.
Square D Power Management Engineering Services typically perform the following start-up practices when commissioning a PowerLogic system with an automatic control:
- Power all switchboards and verify proper interconnection wiring and control voltages.
- Set up all Powerlogic devices and communication modules. This will include all addressing and basic internal parameters used by the device.
- Install the PLCs and load programs.
- Install and configure the power monitoring workstation.
- Manually test each breaker locally, verifying the trip and close operation of each breaker.
- Manually test all motorized breakers from the mimic panel.
- Verify the communications from the power monitoring workstation, to meters, generators, UPS, other monitoring devices and remote I/O.
- Verify the proper data is displayed on the power monitoring computer screens. This includes breaker status, analog inputs, communications, and alarming.
- Manually test each breaker from the power monitoring workstation.
- If load shed system installed with automatic throw over system (ATO), then with generator equipment turned off and one supply open, verify interlocking scheme from the Mimic panel to insure that no two (2) sources can be paralleled.
- Perform all manual tests from the power monitoring computer. This includes any manual operation of start/stop commands to the generators, isolation of the UPS. Any load bank testing should be accomplished during this time.
- Simulate auto-transfer sequences
