변압기의 절연강도표(Transformer's Insulation)

변압기의 절연강도표(Transformer's Insulation)

 

 

1. ESB

1) ESB 140(3MVA 이상 전력용 변압기)

계통 공칭전압(kV)	뇌임펄스전압1.2/50μs 파고치		상용주파 내전압(kV실효치)
	전파	재단파
3.45/6.9	60	69	22
22.9	150	165	50
66	350	400	140
154	650	750	275

 

2) 중성점 단자의 절연강도

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선로측 단자의 절연강도(kV)	중성점 단자의 절연강도(kV)		비고
	표준 BIL	저감 BIL
60	60	-
150	150	-
350	250	150
650	350	150

 

3) 부싱의 절연강도

계통 공칭전압 (kV)	정격 전압 (kV)	뇌임펄스 전압1.2/50μs 파고치			상용주파 내전압(kV실효치)
		전파	재단파(3μs)	재단파(2μs)	건조1분	주수10초
6.9	7.2	60	-	-	27	27
22.9	25.8	150	172	194	60	50
66	72.5	350	402	452	160	140
154	170	650	862	968	365	315

 

 

2. JIS(JIS-204) & KS

공칭전압 (kV)	절연계급 (호)	뇌임펄스전압1.2/50μs 파고치		상용주파내전압 (kV실효치)
		전파	재단파
3.3	3A	45	50	16
	3B	30	-	10
6.6	6A	60	65	22
	6B	45	-	16
11	10A	90	100	28
	10B	75	-	28
22	20A	150	165	50
	20B	125	-	50
33	30A	200	220	70
	30B	170	-	70
66	60	350	385	140
77	70	400	440	160
110	100	550	605	230
154	140	750	825	325
187	140	750	825	325
220	170	900	990	395
275	200	1050	1155	460
500	500L	1550	1705	750

A: 표준 레벨 , B: 저 레벨 (피뢰기등으로 낮게 억제 될 때)

 

 

3.IEC (76-3)

Rated withstand voltages for transformer windings with highest voltage for equipment Um<300kV , Series I (based on current practice other than in the United States of America and some other countries)

 

The choice between list 1 and list 2 for Um<52kV and the choice between alternative rated withstand voltages for Um>123kV depends on the severity of overvoltage condition to be expected in the system and on the importance of the particular installation. Guidance may be obtained from IEC 71-1(Insulation coordination: Part 1 : Terms, Definitions, Principles and Ruled. The values chosen should be clearly stated in the inquiry)

Highest voltage for equipment Um(r.m.s)	Rated short duration power frequency withstand voltage(r.m.s)	Rated lightning impulse withstand voltage(peak)
		List 1 (kV)	List 2 (kV
≤1.1	3	-	-
3.6	10	20	40
7.2	20	40	60
12	28	60	75
17.5	38	75	95
24	50	95	125
36	70	145	170
52	95	250
72.5	140	325
123	185	450
	230	550
145	275	650
170	325	750
	360	850
245	395	950

 

 

4. ANSI(STD C57.12.00-1993)

Table 3 Relationships of Nominal System Voltage to Maximum System Voltage and Basic Lightning Impulse Insulation Levels(BIL) for System 765 and Below.

Class II Power transformer shall include power transformer with high voltage winding from 115kV through 765kV - See Table 5

Application	Nominal System Voltage (kV rms)	Maximum System Voltage (from ANSI C84.1-1989 (2) and ANSI C92.2-1987 (4) (kV)	Basic Lightning Impulse Insulation Levels(BIL) in Common Use (kV crest)				Chopped- Wave	Low Frequency Test Level (kV rms)
Distribution	1.2		30				36	10
	2.5		45				54	15
	5		60				69	19
	8.7		75				88	26
	15		95				110	34
	25		150	125			175(145)	50(40)
	34.5		200	150	125		230	70
	46	48.3	250	200			290	95
	69	72.5	350	250			400	140
Power	1.2		45	30			50	10
	2.5		60	45			66	15
	5		75	60			83	19
	8.7		95	75			105	26
	15		110	95			120	34
	25		150				165	50
	43.5		200				220	70
	46	48.3	250	200			275	95
	69	72.5	350	250			385	140
	115	121	550	450	350		605	230
	138	145	650	550	450		715	275
	161	169	750	650	550		825	325
	230	242	900	825	750	650	990	395
	345	362	1175	1050	900		1290	520
	500	550	1675	1550	1425	1300	1845	-
	765	800	2050	1925	1800		2255	-