Data Center Power Loss Event Tree

Data center power loss event tree

A data center power loss event tree explains how backup power barriers work together after the utility supply fails. The UPS must carry the critical load long enough for the generator to start, and the transfer switch must then connect the standby source. If every barrier succeeds, service continues. If a barrier fails, the tree shows the interruption or outage path clearly. Facilities managers and reliability engineers can use this form to communicate the logic of a power-continuity design before building a more detailed reliability model. The frequencies in this example are illustrative. Use outage records, maintenance data, tested transfer times and the actual topology of the site when calculating risk or availability.

種類 イベントツリー規格 IEC 62502:2010エンジン schematex-eventtree更新日 2026/9/24

依頼内容

“Create an event tree for utility power loss at a data center with UPS support, generator start, and transfer-switch barriers, ending in continuous service, service interruption, or immediate outage.”

次はこちらAdd a second generator as a redundant barrier.Change the UPS failure probability to 0.01.

この図に含まれるもの

図の背後にある意思決定を読み解く。

01Ride-through first

The UPS bridges the interval before standby power is available.

02Standby source second

Generator start is evaluated only if the UPS holds the load.

03Transfer last

The switch must complete the connection to preserve service.

Use for a simple continuity discussion of one standby-power path; represent redundant paths separately when needed.

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よくある質問

Why is the UPS the first barrier?

It provides immediate ride-through while the generator starts and the transfer switch operates.

Does this replace an availability model?

No. It is a clear consequence model that can inform, but does not replace, a detailed availability analysis.

Can an event tree show redundant generators?

Yes. Add the generator paths as ordered barrier functions that reflect the actual switching design.