大多数高可靠性设施都对 UPS 系统进行了大量投资, 发电机和其他缓解设备，以防止电力供应问题影响其业务. 然而, 这些缓解装置和相关设备是复杂的机电系统，本身很容易出现故障，并且在不符合制造商规格的情况下通常不会提供任何警报或通知. 这就是持续功率监控的用武之地.
电能质量监测系统 持续评估设施内关键位置的电力供应状况（包括公用设施供应）, 发电机, UPS 输入和输出以及其他关键配电点和负载. These systems have been proven to prevent problems from occurring by proactively detecting anomalies in the electrical supply before they escalate into system failures. These systems are invaluable for troubleshooting failures should they occur as well as monitoring demand, energy and environmental parameters like temperature and humidity.
The ideal time to install any electrical equipment, including power monitoring equipment, is during the initial construction phase. An often overlooked benefit of these monitoring systems is they can be an extremely valuable asset that can be used during site commissioning. During this phase the entire facility is put through its paces with each element being thoroughly tested to validate the design, 查看设备是否按照制造商/设计者的规格运行，并且与整体设施兼容. 电力监控系统不仅可以通过记录和记录设施的成功调试来提供显着的附加值，还可以识别和解决在此关键阶段发生的任何系统故障.
一家大型全球有线电视和媒体公司最近建造并委托使用了最先进的数据中心和生产设施. 施工期间, 德拉内茨的安可系列, 安装永久安装的电能质量监测系统来监测 25 数据中心内的关键位置. 受监控的位置包括每个公用事业源, 发电机, 每个 UPS 的输入和输出以及 UPS 下游的关键 PDU. Encore Series was chosen for many reasons including state-of-the-art power quality capabilities, ease of use, web browser interface and cost vs. the competition.
Wanting to take full advantage of its benefits, Encore Series was an integral part of site commissioning with recorded data continually being evaluated and compared to expected results. Among many items, the commissioning procedures included tests to evaluate the source transfer from utility (one of two utility supplies) to generators then back to utility. Unlike other test performed, this transfer test failed multiple times with the facility remaining dark and the test uncompleted as failures were detected prior to completion. Between tests one line diagrams were reviewed and compared to the actual build out in order to verify proper equipment installation and construction in attempts to locate the source of the problem. This evaluation indicated several related breakers were either tripped or in the wrong position. The final test attempted proved much more serious with a complete failure of a utility breaker which exhibited visual damage and a smoke odor.
Being commissioned prior to start of site acceptance testing Encore Series data was reviewed for forensic evidence of this failure. The monitoring system design was such that critical locations important to this test were instrumented providing extremely valuable data which resulted in the quick diagnosis of this problem. Each generator bus (发电机 1, 发电机 2) and utility feed (Utility 1, Utility 2) was monitored and waveshapes recorded at locations Generator 1 and Utility 2 at the time of the last test that resulted in the breaker failure.
A close inspection of the current waveforms recorded at both Generator 1 (3000A bus) and Utility 2 (4000A bus) locations provided a key indicator of the source of the problem. Current measurements at each location were many times higher than the rated bus capacity. 其实, current waveshapes on all phases were clipped indicating a saturation of current transformers (CT’s) as a result of currents well in excess of their specifications.
The data above quickly led the team to closely review the sequence of events leading up to, and resulting from the failure at these locations. As suspected, 发电机 1 and Utility 2 buses were connected together as shown in the diagram below at the time of failure. 由于异相，系统上产生的电流导致相关断路器跳闸，最终导致发电机故障 1 断路器. 进一步调查表明可编程逻辑控制器中存在排序问题 (PLC的) 允许生成器 1 and Utility 2 断路器同时闭合. PLC 中的编程错误被确定为问题的最终根源. 编程错误已更正, 故障断路器被修复，然后测试成功进行.
“安可系列今天已收回成本” 设施经理评论道. 通过电能质量监测系统来监督现场调试，有助于该设施非常快速地解决关键路径故障，同时对总体进度的影响最小. 在这种情况下, 系统的投资回收期小于 1 月!
源:
Dranetz
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