Parallel operation of UPS and power protection systems

Parallel operation of UPS and power protection systems

The parallel operation of uninterruptible power supplies (UPS), whether in parallel or parallel redundant capacity, focuses on criteria such as mode (present or lack of power supply), battery operation, handling the restoration of power, conditions Error and overload. It also depends if it is connected to a single or dual power supply input.

The rectifier and static bypass switch to provide the inputs are drawn from a common point of AC power (construction of a newcomer) and eachUPS with insulators or allow adaptation to individual switches off. Each module also has its own set of drums.

The output of each UPS module is connected to a common ac busbar, which then spread to critical loads. This configuration of the UPS is equipped with an emergency bypass switch (button). A crossroads for the future expansion of substitution is integrated in the cabinet.

Mode of operation

In normalOperation, if mains power supply or back-up power supply (diesel generator, for example) is present, each of the UPS modules share the load evenly.

In battery mode, if power and / or back-ups are no longer available, each share of uninterruptible power supply modules in parallel redundant configuration will continue to load. Each has its own battery with the same duration and the duration of the threshold DC voltage is turned off. However, each set of batteriesDischarge at different rates. In the event of prolonged power outage, the battery is up to the threshold of their DC disconnect.

Uninterruptible power supply modules are restarted automatically when utility power is restored. To avoid tripping of the upstream signal, boot sequence includes a soft-start action to reduce the impact of the high inrush current.

If one of the UPS modules detect an internal error, it will automatically disconnect from the commonOutput, in which case the remaining modules in the configuration you pick up the load (without interruption) and share them as well.

If a second engine fails in the parallel configuration, the remaining modules in a power overload and bypass the load with power via an electronic switch. This method of parallel operation of UPS ensures the load receives an adequate power source automatically and without interruption.

Faced with an overload of allDepending on the size and duration of overload - UPS reacts in two ways. First, the UPS inverter overload behavior, as in the case of an overload of small (less than 100 to 150% of rated power), the UPS continues to power the load from its inverter.

Secondly, for larger overloads that exceed the capabilities of UPS, automatically, all the modules in an attempt to correct the error handle.Will remain so until the fault is corrected or, if this continues, the arrest.

It 'important to emphasize that there is a risk of bypass, system resilience, and that is why modern UPSs have been designed and programmed to generate alarm messages that can be monitored locally or remotely over a network.

Emergency bypasses are normally installed in parallel UPS configurations, so electrically isolated modules on and offif necessary.

With a dual input supply, the UPS system from separate rectifier and static switch sources, which helps to increase the resilience and negates the single point of failure associated with a single supply delivered.

The operation of a parallel capacity of continuity of power is the same as a parallel redundant system - except as regards the failure of the UPS module. In this case, if a module fails, the entire balance, plus the route, are forced into overloadState and transfer the load to bypass. This ensures that the load is maintained at a sufficient power supply automatically and without interruption.

There are some useful accessories that can be installed in parallel operation of UPS, a UPS Group synchronizer (UGS) and Parallel Systems Joiner. A UPS Group synchronizer synchronizes the outputs of two separate sets of parallel UPS, which can be powered from separate sources of CA. It allows the outputs to the groupsFounded in dual-bus format. A Parallel Systems Joiner works similarly, but allows the connection of two separate groups in a dynamic format dual bus, the extension of the system, fault tolerance and ease of maintenance easier.

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