HAT821, SmartGen two-line one-bus-tie controller released in 2018, has perfect and mature functions after two years of technical accumulation and market integration.
At the same time, we have developed two bus-tie controller adapters and supporting wiring harnesses, and added synchronous parallel transfer function (HAT821S), to meet the demand of different customers. This has been well received by customers and has delivered a satisfactory answer for customers who are using it.
Logic interlock and electrical interlock are very important part in two-line one-bus-tie system. To ensure the reliable operation of transfer switch, we use the adapter with controller logic lock to achieve triple interlock.
Primary Interlock: Controller Logic Lock
Logic interlock is realized by controller’s powerful software function. In the non-parallel transfer mode, if two breakers have closed, ensure that the third breaker will not close.
HAT821
Double Interlock: Electrical Interlock via ATA821 Adapter
Through the coordination of ATA821 adapter and switch auxiliary contacts, two sets of normally closed contacts of each breaker switch are used to interlock the closing output signal of controller, avoiding the malfunction caused by the contact adhesion of closing relay due to the damage of controller.
ATA821
Triple Interlock: Electrical Interlock via ATA821MN Adapter
Through the coordination of ATA821MN adapter and switch auxiliary contacts, four sets of normally closed contacts of each breaker switch are used to interlock controller’s closing signal and undervoltage tripper of each switch, avoiding the misoperation when the user use the switch body button to close breaker. If two breakers have been closed, the undervoltage trip coil of the third breaker will be powered off, and cannot be closed even with the switch body button.
ATA821MN
Controller logic lock + electrical interlock of closing signal + electrical interlock of undervoltage tripper, triple interlock, triple protection. Make transfer more reliable, make power utilization safer!
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