ANSI ceramic line post Insulators
1. ANSI 57-1, 57-2… series ceramic line post insulators drawings, technical data and images show as follows:

Type
Fig NO.			1	2	3	4	5	5
Leakage distance		mm	356	559	737	1016	1143	1346
Dry arcing distance		mm	165	241	311	368	438	489
Cantilever strength		kN	12.5	12.5	12.5	12.5	12.5	12.5
Power frequency flashover voltage	Dry	KV	70	100	125	140	160	180
	Wet	KV	50	70	95	110	130	150
Critical impulse flashover voltage	Positive	KV	120	160	200	230	265	300
	Negative	KV	155	205	260	340	380
Radio interference voltage	Test voltage to ground	KV	15	22	30	44	44	44
	Max. RIV at 1 MHz	μV	100	100	200	200	200	200

2. ANSI 57-12, 57-13… series ceramic line post insulators drawings, technical data and images show as follows:

Type
Fig NO.			1	2	3	4	5	5
Creepage distance		mm	356	559	737	1016	1143	1346
Dry arcing distance		mm	165	241	311	368	438	489
Cantilever strength		KN	12.5	12.5	12.5	12.5	12.5	12.5
Power frequency flashover voltage	Dry	KV	70	100	125	140	160	180
	Wet	KV	50	70	95	110	130	150
Critical impulse flashover voltage	Positive	KV	120	160	200	230	265	300
	Negative	KV	155	205	260	340	380
Radio interference voltage	Test voltage to ground	KV	15	22	30	44	44	44
	Max. RIV at 1 MHz	μV	100	100	200	200	200	200

3. ANSI 57-21, 57-22… series ceramic line post insulators drawings, technical data and images show as follows:

Type
Fig No.			1	2	3	4	5	5
Creepage distance		mm	356	559	737	1016	1143	1346
Dry arcing distance		mm	165	241	311	368	438	489
Cantilever strength		KN	12.5	12.5	12.5	12.5	12.5	12.5
Power frequency flashover voltage	Dry	KV	70	100	125	140	160	180
	Wet	KV	50	70	95	110	130	150
Critical impulse flashover voltage	Positive	KV	120	160	200	230	265	300
	Negative	KV	155	205	260	340	380
Radio interference voltage	Test voltage to ground	KV	15	22	30	44	44	44
	Max. RIV at 1 MHz	μV	100	100	200	200	200	200

4. ANSI 57-31, 57-32… series ceramic line post insulators drawings, technical data and images show as follow:

Type
Creepage distance		mm	356	559	737	1016	1143	1346
Dry arcing distance		mm	165	241	311	368	438	489
Cantilever strength		KN	12.5	12.5	12.5	12.5	12.5	12.5
Power frequency flashover voltage	Dry	KV	70	100	125	140	160	180
	Wet	KV	50	70	95	110	130	150
Critical impulse flashover voltage	Positive	KV	120	160	200	230	265	300
	Negative	KV	155	205	260	340	380
Radio interference voltage	Test voltage to ground	KV	15	22	30	44	44	44
	Max. RIV at 1 MHz	μV	100	100	200	200	200	200

Africa porcelain line post type Insulators
1. Capless line post insulator, the main technical parameters:

Type:
Nominal voltage	KV	22	22	22	33	33	33
Nominal creepage distance	mm	630	750	750	900	1120	1120
Bottom fixing diameter	mm	M20 OVERSIZE	M20 OVERSIZE	M20 OVERSIZE	M20 OVERSIZE	M20 OVERSIZE	M20 OVERSIZE
Top fixing diameter	mm	73	73	73	73	73	73
Top groove radius	mm	20	20	20	20	20	20
Cantilever strength	KN	4	4	10	6	10	4
Dry arcing distance	mm	290	325	325	389	390	415
Power frequency flashover dry	KV	124	109	111	161	105.7	137.1
Power frequency flashover wet	KV	84	86	85	123	86.4	101.1
Power frequency withstand dry	KV	121	106	106	146	96	131.1
Power frequency withstand wet	KV	76	72	69	85	76	88.4
Impulse withstand voltage (bil)	KV	183	184	186	230	207	229.7
Impulse flashover positive	KV	187	191	193	238	221.5	241.3
Impulse flashover negative	KV	362	343	344	410	418.4	414.6

2. Capped line post insulator, the main technical parameters:

Type
Nominal voltage	KV	11	11	12	33	33	33	33	33	33
Nominal creepage distance	mm	300	405	400	786	1050	813	1100	900	1116
Bottom fixing diameter	mm	M20	M20	M20	M20	M20	M20	M20	M20	M20
Top fixing diameter	mm	73	73	73	73	73	73	73	73	73
Top groove radius	mm	12.5	25	12.5	25	25	20	20	25	25
Cantilever strengh	KN	7	12.5	4	4	12.5	10	10	10	12.5
Dry arcing distance	mm	160	170	218	320	390	335	425	368	432
Power frequency flashover dry	KV	70	79.7	97	131	157	123	140	125	140
Power frequency flashover wet	KV	40	43.7	65	87	106	87	91	95	110
Power frequency withstand dry	KV	63	75.1	91	127	145.9	115	124	110	120
Power frequency withstand wet	KV	35	38	57	75	87.6	72	82	78	90
Impulse withstand voltage (bil)	KV	100	95	150	205	247	192	245	200	215
Impulse flashover positive	KV	110	142.8	164	209	258.4	197	255	210	230
Impulse flashover negative	KV	183	218.2	263	346	413.7	370	414	260	280

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