JB/T 2377-1978 Capacitive wall bushing types and dimensions JB/T2377-1978 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Oil impregnated paper capacitance graded wall bushings--Types and dimensions1 Subject content and scope of application
This standard specifies the types and dimensions of oil-paper capacitor graded wall bushings (hereinafter referred to as bushings). GB 13026-91
This standard applies to bushings used in three-phase AC systems with rated voltages of 63~500kV and frequencies of 15~60Hz. 2 Reference standards
GB772 Technical conditions for high-voltage insulator porcelain
GB2900.8 Electrical terminology insulator
GB4109 Technical conditions for high-voltage bushing
GB 5273
GB5582
3 Terms
Terminals for transformers, high-voltage electrical appliances and bushings External insulation pollution migration level of high-voltage power equipment
The terms used in this standard are in accordance with the provisions of GB2900.8. 4 Types and dimensions
4.1 Structural type of bushing
The bushing should be a sealed structure, filled with high-quality transformer oil, and equipped with a rain cover and oil pillow on the top of the outdoor end (or upper end). The oil storage tank for horizontally installed bushings or the oil pillow for vertically installed bushings shall be equipped with an oil level gauge to observe the oil level changes. The middle connecting sleeve shall be equipped with an oil sampling device and a measuring lead terminal for measurement. The structure of the bushing shall comply with the provisions of Figures 1 to 4. Model Description:
The model structure of the bushing is as follows:
Additional feature code
Installation method code
Rated current
Rated voltage
Design sequence number
Structural feature code
Product type code
a. Product type code
-Oil-paper capacitor wall bushing
Approved by the State Administration of Technical Supervision on July 15, 1991, and implemented on April 1, 1992
Structural features:
GB 13026-91
Can current transformer be installed: L--Can be installed with current transformer; not indicated when current transformer cannot be installed. Outdoor end (or upper end) external insulation structure: W pollution-resistant type; ordinary type is not indicated. Design serial number:
According to the order in product design, Arabic numerals are used to represent the design order, and the order starts from 1 and is arranged in the order of natural numbers. Characteristic numerals:
Rated voltage kilovolts
Rated current amperes
Installation method:
Z----Vertical installation, horizontal installation is not indicated. Additional characteristic code:
The minimum nominal creepage distance of the external insulation pollution level at the outdoor end (or upper end) of the bushing shall be in accordance with the provisions of GB5582, and the external insulation pollution level codes are as follows:
2--the minimum nominal creepage distance is 20mm/kV; 3
--the minimum nominal creepage distance is 25mm/kV; 4--the minimum nominal creepage distance is 31mm/kV. Model example: rated voltage 110kV, rated current 630A bushing, outdoor porcelain bushing creepage distance 20mm/kV, horizontal installation, current transformer cannot be installed, its model is: CRW-110/630-2
Figure 1 Bushing structure type I
GB 13026-91
Figure 2 Bushing structure type I
GB13026-91
Figure 3 Relative position of horizontally installed bushing flange mounting hole and oil pillow Oil pillowwwW.bzxz.Net
Position of oil level gauge on oil
Figure 4 Relative position of vertically installed bushing flange mounting hole and oil pillow 4.2 The main dimensions of the bushing shall comply with the requirements of Tables 1 and 2. GB 13026—91
?Honorary title
+- 089/011-m'th
-89/011MTA
-029/01
-09011-A
089/01
089/011-A
-08989|| tt | -
2 -021027 -
13026—91
Shiyeye
&- 2089/02-MHO
2-Z089/022-MAS
E-20521/011-m782
E:70921/011-M742|| tt||20921011-180
8- Z0S21/011-m20
2-Z02/011-MA
Z89/01-E
2-2089/011-MTA0
2089/011 -18
2089/011AE
2089/011-MAS
Z089/011
8-Z089/69-MH3
2089/8A
GB 13026—91
4.3 In addition to complying with this standard, the manufacture of bushing terminals shall comply with the provisions of GB5273. 4.4 Main dimensional deviation of bushing:
The dimensions listed in Table 1 and Table 2 are nominal values, and the main dimensional deviations are specified as follows: For the center circle diameter (α,) of the flange mounting hole a.
When a350mm: ±1mm
When a2>350mm: ±1.5mm
b, for the minimum nominal creepage distance of the outdoor end (and the upper end), according to GB772, the negative deviation shall not exceed the following formula. 0.025l+6mm
Where: -
-minimum nominal creepage distance, mm.
4.5 Installation of busy oil cabinet:
The oil cabinet with horizontally installed bushing should be fixed by the connecting pipe (not higher than 2m of the bushing), and the size of the connecting flange seat is specified in Figure 5.
Additional instructions:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Insulators. This standard was drafted by Xi'an Electric Ceramics Research Institute. The main drafter of this standard is Luo Yansong.
From the date of implementation of this standard, the former Ministry of the First Machinery Industry of the People's Republic of China Standard JB2377-78 "Types and Dimensions of Capacitive Wall Bushings" will be invalidated.
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