145
Appendix
General Electric:
Through Porcelain
1
High Current, Solid Porcelain
2
Flexible Cable, Compound Filled
1
Oil-Filled Upper Portion, Sealed
Oil-Filled, Sealed
Oil-Filled Upper Portion, Sealed
Oil-Filled Upper Portion, Sealed
Oil-Filled Expansion Chamber
Forms C & CG, Rigid Core,
Compound Filled
1
Oil-Filled, Sealed
Oil-Filled, Sealed
A
A
B
D
F
L
LC
OF
S
U
T
3.0
1.0
5.0
1.0
0.7
1.5
1.5
0.8
1.5
0.5
0.5
5.0
2.0
12.0
2.0
1.5
3.0
3.0
2.0
6.0
1.0
1.0
Note: 1. Forms S, Type F, DF, and EF (flexible cable) redesigned as types B, BD, and BE,
respectively, no form letter (through porcelain redesigned as type A).
2. Modern high current oil-filled solid porcelain design.
Haefeley Trench:
Under 1400kV BIL
1400kV BIL and above
COTA
COTA
0.3
0.35
Double Name-
plate
Note: 1. C
1
capacitance is doubtful if 10% over nameplate.
2. C
1
capacitance is doubtful if 5% over first measurement in field after installation.
3. C
2
capacitance may vary by 20%. Reference Haefeley fax dated April 5, 1994.
4. Some bushings, 115kV and above, which have potential taps, have C
1
nameplate
capacitance based on factory tests made on the test tap. The test tap is then buried and
unavailable to the user. The user instead tests the bushing using the potential tap where
the capacitance appears to be high compared to the nameplate values. The capacitance
obtained in the field must be modified as follows:
C
1
= (C
1
(Haefeley) x (C
2
(Haefeley)) / (C
2
(Haefeley) - (C
1
(Haefeley)), where (C
1
(Haefeley) and (C
2
(Haefeley) are the nameplate capacitances.
5. Reference Haefeley fax dated April 3, 1995.
Manufacturer:
Description
Bushing
Type or Class
Power Factor Limits
(% at 20°C)
Typical Doubtful or
questionable
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