Yuhchang Electric Co., Ltd.

Calculation Table For Installation Capacitor

Power factor Cos after improvement
		1.0	0.99	0.98	0.97	0.96	0.95	0.94	0.93	0.92	0.91	0.90	0.85	0.80
	0.5	1.73	1.59	1.53	1.48	1.44	1.40	1.37	1.34	1.30	1.28	1.25	1.11	0.98
	0.52	1.64	1.50	1.44	1.39	1.35	1.32	1.28	1.25	1.22	1.19	1.16	1.02	0.89
	0.55	1.52	1.38	1.32	1.27	1.23	1.19	1.16	1.12	1.09	1.06	1.04	0.90	0.77
	0.57	1.44	1.30	1.24	1.19	1.15	1.11	1.08	1.05	1.01	0.99	0.96	0.82	0.69
	0.6	1.33	1.19	1.13	1.08	1.04	1.01	0.97	0.94	0.91	0.88	0.85	0.71	0.58
	0.62	1027	1.23	1.06	1.01	0.97	0.94	0.90	0.87	0.84	0.81	0.78	0.65	0.52
	0.65	1.17	1.03	0.97	0.92	0.88	0.84	0.81	0.77	0.74	0.71	0.69	0.55	0.42
	0.67	1.11	0.97	0.91	0.86	0.82	0.78	0.75	0.71	0.68	0.65	0.62	0.49	0.36
	0.7	1.02	0.88	0.81	0.77	0.73	0.69	0.66	0.62	0.59	0.56	0.54	0.40	0.27
	0.72	0.96	0.82	0.75	0.71	0.67	0.63	0.60	0.57	0.53	0.51	0.48	0.34	0.21
	0.75	0.88	0.74	0.67	0.63	0.58	0.55	0.52	0.49	0.45	0.43	0.40	0.26	0.13
	0.77	0.83	0.69	0.62	0.58	0.54	0.50	0.47	0.43	0.40	0.37	0.35	0.21	0.08
	0.8	0.75	0.61	0.54	0.50	0.46	0.42	0.39	0.35	0.32	0.29	0.27	0.13
	0.82	0.70	0.56	0.49	0.45	0.41	0.37	0.34	0.30	0.27	0.24	0.21	0.08
	0.85	0.62	0.48	0.42	0.37	0.33	0.29	0.26	0.22	0.19	0.16	0.14
	0.87	0.57	0.42	0.36	0.32	0.28	0.24	0.20	0.17	0.14	0.11	0.08
	0.90	0.48	0.34	0.28	0.23	0.19	0.16	0.12	0.09	0.06	0.02
	0.91	0.45	0.31	0.25	0.21	0.16	0.13	0.09	0.06	0.02
	0.92	0.43	0.28	0.22	0.18	0.13	0.10	0.06	0.03
	0.93	0.40	0.25	0.19	0.15	0.10	0.07	0.03
	0.94	0.36	0.22	0.16	0.11	0.07	0.04
	0.95	0.33	0.18	0.12	0.08	0.04
	0.96	0.29	0.15	0.09	0.04
	0.97	0.25	0.11	0.05
	0.98	0.20	0.06
	0.99	0.14

[Example]

Assume factory load : 200 KW Power factor before improvement :Cos =0.80 Expected power factor :Cos =0.97 Ratio of needed power capacity calculated from the above table is 0.50 thus needed capacity C=200x0.5=100KVA

[Equations]
KAV=2f CE2 X 10-3	A(1)= =	=3.1416 f=Hz C=F E=KV =1.732
C=	A(3)=