Why Wye Connection? Why Delta Connection? - Pumps & Systems
2013年5月21日 · The primary and secondary of a three-phase transformer can be designed as Delta/Delta, Wye/Wye, Delta/Wye and Wye/Delta. Delta/Delta is used in many industrial installations, while Delta/Wye is the most common configuration. Wye/Delta is used in high voltage transmission, and Wye/Wye is seldom used because of potential unbalance.
Why Wye? Why Delta? - Pumps & Systems
2013年7月30日 · You have probably noticed that three-phase motors can have a varying number of leads exiting the junction box. The most common numbers are three, six, nine or twelve. Note that these numbers are all multiples of three since their combinations must accommodate three incoming phases. These lead combinations are designed to accommodate single or dual …
Open-Delta Systems Affect Variable Frequency Drives
2012年9月1日 · Users may need to speak to someone in the engineering department. This information should be available to the end user or any contractor installing equipment at the site. Generally, if only two transformer cans are located on the pole, it will be an open-delta (unbalanced) system. Open-Delta Systems & VFDs
Why Wye? Why Delta? - Pumps & Systems
2013年7月1日 · This system also increases the probability of unbalance by providing two, single-phase connections on a single transformer. If this design powers a three-phase motor and its single phase control circuit, it is always best to disconnect all other single-phase loads. Figure 3. Center-Tapped, Open Delta mutant
Choosing the Proper VFD Can Limit Harmonics | Pumps & Systems
2015年12月28日 · A 12-pulse VFD is an alternate type of VFD that has less harmonics than a six-pulse VFD, but requires a special Delta-Delta/Wye transformer. These multi-pulse drives configurations continue in multiples of six: 12-pulse, 18-pulse, 24-pulse and 30-pulse.
AC Power (Part Four): Transformers | Pumps & Systems
2011年12月17日 · The primary and secondary windings of the three-phase transformer are configured in two basic patterns—Delta and Wye. The primary and secondary can be any combination of the two (such as Wye/Delta, Delta/Wye, Delta/Delta and Wye/Wye). This article will examine the Delta and Wye secondary characteristics only.