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#1 01-11-2017 03:36:26

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One of the most critical components of any emergency or standby power system is the automatic transfer switch. In the scenario of a power outage Cheap Lsu Tigers Jerseys , this switch quickly shifts the load circuit from the main power source to the alternate source automatically. Due to this, it facilitates critical loads to continue running with minimal to no outage. Additionally, it also has the re-transfer process in place which connects back the load circuit to the normal power source once it has got restored. Whenever any standby power system utilizes an automatic switch, it contains one of the following modes of operation of the automatic load transfer switch.

Open Transition

Such switches provide a ‘break-before-make’ transfer switch. In this type of transfer, the load is first disconnected from one source and then connected to the alternate source. Though this transfer sequence is accomplished quite quickly but still a brief power interruption will be evident to the building occupants and very sensitive electronic equipment. It can be an ideal solution for small business or residential installation which does not have sensitive loads or large inductive motor loads.

Delayed Transition

Such automatic switches also provide a ‘break-before-make’ transfer sequence but here, the equipment will disconnect from the source and pause for a while to delay the transition before moving ahead to connect to standby power source. This delay of transfer sequence is crucial in many situations. Electric motors are a predominant component of the load profile in many industrial installations. When such large motors get de-energized, their slowing down is gradual which induces an effect of maintaining a relatively high voltage on the line terminals. Thus Cheap Kansas Jayhawks Jerseys , the de-energizing and quick re-energizing of large electric motors can result in current surges that can trip protective devices and sometimes damage the motor itself. The delay before the re-energizing gives time to the motors to coast down to safe voltage levels before getting re-powered up. The same scene also happens with power transformers which need to de-energize long enough to facilitate their magnetic fields to collapse to safe levels before getting re-energized. The same application issue also becomes critical for uninterruptible power systems (UPS) as they need to allow its entire controlled device to properly sense a power outage and then complete the switch. This must happen before the UPS gets re-energized by an alternate source and then switch away from the batteries. Thus, it can be surmised that all those applications where the load profile constitutes of large electric motors, transformers or UPS connected appliances; nothing suits better than the delayed-transition transfer switch. Due to it, such switches are perhaps the most common and prevalent in manufacturing facilities, large pump stations, municipal water treatment plants and a broad range of commercial facilities.

Closed Transition

Such switches offer a make-before-break transfer sequence. In such transfer, the original source from where the load transfer happens Cheap Georgia Bulldogs Jerseys , remains closed or connected till the alternate source to which the load is getting transferred, also gets closed or connected. Once both are closed, then the source from which load transfer has happened gets disconnected. The importance of this sequence lies in the fact that it provides a continuity of power even during load transfer. For such closed-transition transfer sequence to take place, two conditions must be present. First is that both sources must be synchronized without which they cannot get closed. Second, the period of time during which both sources remain closed must be extremely short, lasting less than 100 milliseconds. Fulfillment of these two conditions, require some special accessories inside the transfer switch. Depending on configuration Cheap Florida State Seminoles Jerseys , this accessory is also of three types: - passive, active and ‘soft loading’.
This would make it amply clear that selecting the right type of automatic switch can make a huge difference to the facility’s power operation as well as the confidence of the operational staff. A reliable power transfer system is the key for smooth operation and productivity.
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Submitted 2014-03-11 15:21:05
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