客户在一家新玻璃工厂中经历了多次电子控制和仪器故障. 工厂已从60hz国家进口到50hz国家. 在这种情况下, 新工厂产能减少 50% 或更频繁的停工和停工. 电子设备的维修成本只占每次故障总成本的一小部分. “你不能简单地关闭和开启玻璃工厂”.
客户尝试使用电压表和简单的功率监视器来确定问题的根源. 他们无法捕捉到破坏性的电压变化. 仪表的图表显示没有明显的电压变化. 看 图形 1 例如，线对线和线对中性点的 RMS 值显示没有高电压变化.
我们安装了一个 Dranetz PG4400 Power Quality Monitor at the 400 volt buss level. The results are shown in 图形 2. Notice the peak voltage graph clearly shows multiple high voltage transients recorded by the unique voltage peak recording capability of the PG4400. 图形 3 shows the detail of the voltage transient. In order to find the source of the transient, we installed additional Dranetz PX-5 和 PG4400 monitors at the source voltage of 10Kv. 图形 4 shows the details of the 10KV with voltage transients recorded with the peak recording capability of the PG4400.
Based on this evidence we determined the voltage transient had multiple sources. One source was from the 10KV voltage level as shown by these graphs. The second source was investigated in a separate project.
源:
Dranetz
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