Porcelain station post insulator is used in substations, stations and electrical device for 1200kv for supporting and insulating. 69.5kV, 72kV and other high voltage Porcelain station post insulator is popular post insulators made by wet process porcelain or dry process porcelain with excellent mechanical strength. Porcelain station post insulator is solid core insulator used with flange to fix on insulators. Over 220kV post insulators need used with two grading rings.

ANSI Type
Leakage distance	mm	267	394	610	940	1092	1892	610	394	610	940	1092
Cantilever strength	KN	8.9	8.9	8.9	8.9	8.9	6.7	17.8	17.8	17.8	17.8	17.8
Tension strength	KN	31.1	38	44.5	53	62	71	66.7	89	89	111.2	111.2
Torsion strength	N.m	678	791	904	1130	1356	1695	2101	2452	2802	3502	3502
Compression strength	KN	44.5	44.5	44.5	66.7	66.7	111	89	89	89	133.4	266.9
Low frequency test voltage	KV	5	10	15	22	30	44	5	10	15	22	30
Critical impulse flashover positive voltage	KV	105	125	170	225	280	390	105	125	170	225	280
Low frequency wet withstand voltage	KV	30	45	60	80	100	145	30	45	60	80	100
Impulse withstand voltage	KV	95	110	150	200	250	350	95	110	150	200	250

TR278, TR286, TR287, TR288, TR289, TR291, TR295, TR304, TR308, TR312, TR316 porcelain station post insulators main technical data:

            

ANSI Type
Leakage distance	mm	1892	2515	2515	2946	2946	3234	3234	4191	4191	5029	5029
Cantilever strength	KN	13.3	31.1	11.6	6.23	9.8	5.34	8.23	4.23	6.45	3.56	5.56
Tension strength	KN	111.2	89	111.2	89	111.2	89	111.2	89	111.2	89	111.2
Torsion strength	N.m	7005	7005	15760	7005	15760	7005	15760	7005	15760	7005	15760
Compression strength	KN	266.9	266.9	333.6	267	333.6	267	333.6	267	333.6	267	333.6
Low frequency test voltage	KV	44	73	73	88	88	103	103	146	146	146	146
Critical impulse flashover positive voltage	KV	390	610	610	710	710	810	810	1010	1010	1210	1210
Low frequency wet withstand voltage	KV	145	230	230	275	275	315	315	385	385	455	455
Impulse withstand voltage	KV	350	550	550	650	650	750	750	900	900	1050	1050