2024年10月6日 · High Leg Delta (also known as Power Leg or Wild Leg) is a three phase, four wire power distribution system used in commercial buildings in North America especially in rural and older installations. The main advantages of the high leg delta system is that there are three types of available voltage i.e. 120V, 208V and 240V.

Phasor diagram showing 240 V delta and center-tapped phase (a–c) creating two 120 V pairs. Consider the low-voltage side of a 120/240 V high leg delta connected transformer, where the b phase is the high leg. The line-to-line voltage magnitudes are all the same: = = =.

2020年7月28日 · Theory question concerning a 3-phase 120/240V Delta w/ center tap neutral system. If you have 3 single phase loads sharing a neutral (one of which is the high leg), and you have an open neutral, what is the voltage of the neutral to ground?

2010年8月12日 · What you have is a center tapped delta 120/240 volt 3 phase system. Not a corner grounded delta. The grounded conductor will be the neutral connected to the center tap of one of the windings.

2014年8月27日 · For many small shops, the high leg delta system is preferred over the wye system because the machines get 240 volts three phase and not 208. But the delta should be a full three-transformer delta connection, and not a two-transformer open delta or Vee connection, which gives quite poor voltage regulation under either unbalanced loads or high loads.

2012年9月27日 · It's not exactly 120 degrees apart. Closed delta would keep your 120/240v, and solves 2 & 3. It can be done with 3 single-phase xfmrs, or one 3∅ one.

2020年3月24日 · I'm having trouble understanding the electric principles that allow a center tapped transformer to work. Lets say we're working with 240/120V. I understand if you connect a voltmeter across the top and bottom wires, you'll get 240V, and 120V between the center tap and other two wires. This is where I'm having trouble.

2005年5月17日 · Several manufacturers recommend that a three phase delta-delta transformer, with the 240V secondary center tapped to serve lighting or other 120V loads...

The center of any one of the phases is center-tapped and grounded if the secondary of this transformer is delta. This permits a single transformer to supply 120V single phase for single-phase loads and 240V three-phase for three-phase loads.

2008年4月7日 · Does anyone have any good references or resources for center tapped delta 120/240V transformers? I understand the voltages and associated phasors that are derived from this arrangement but what I am better trying to understand is the limitation on the center-tap "neutral" which I believe is due to circulating currents in the delta primary?