Added Three-Phase section

diegotrap · Jan 10, 2014 · 2df6325 · 2df6325
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diff --git a/accheatsheet.mdown b/accheatsheet.mdown
@@ -134,4 +134,10 @@ $$Q = 0$$
 
 **Power in a inductor**
 
-**Power in a capacitor**
+**Power in a capacitor**
+
+# Three-phase systems
+
+**Delta-Wye transform**
+
+$$Z_{\Delta} = 3 Z_{Y}$$
diff --git a/accheatsheet.pdf b/accheatsheet.pdf
diff --git a/powerelectronics.mdown b/powerelectronics.mdown
@@ -474,6 +474,12 @@ $$PF = \frac{P}{S}$$
 $$PF = \cos{\varphi}$$
 
 
+**Three-phase systems**
+
+
+**Delta-Wye transform**
+
+$$Z_{\Delta} = 3 Z_{Y}$$
 
 
 # Electric power

diff --git a/powerelectronics.pdf b/powerelectronics.pdf