This current transformer is an oil-paper insulated type with a metallic expansion bellow, Connection between components uses argon-arc welding, fill in high pressure nitrogen to detect leakage after assembly is complete.
Current transformer LVB product range is based on top core design. It is an oil-paper insulated type with a metallic expansion bellow, Connection between components uses argon-arc welding, fill in high pressure nitrogen to detect leakage after assembly is complete, so oil penetration and oil leakage caused by oil-immersed products are resolved at root. Use an aluminum alloy cast case, all components including the base, connection box, stainless steel expander, and nameplate etc do not rust forever. It is outdoor, single phase, and oil-immersed to-head type, which is used for metering and relay protection of 220kv, 50 or 60Hz system. It is a reliable product with minimum maintenance and suitable for wide range of environmental conditions.
This product is light and handy with a small volume and light weight and meets the requirement of horizontal transportation.
一、Service Conditions
a. Outdoor
b. Ambient air temperature: –45 ~ +40℃(average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h).
c. Altitude ≤1000m(this is the routine requirement, if there is any different requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requirements).
d. Application: There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material
e. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.
f. Max. wind speed ≤34m/s
g. Earthquake intensity ≤ 7 degree.
二、Technical Parameters
三、Arcing distance and creepage distance of outer insulation please see table 1.
|
Rated voltage(kV) |
Arcing distance(mm) |
Creepage Distance (mm) |
|
35 |
≥410 |
≥1256 |
|
66 |
≥720 |
≥2248 |
|
110 |
≥1010 |
≥3906 |
|
132 |
≥1160 |
≥4495 |
|
150 |
≥1350 |
≥5270 |
|
220 |
≥2010 |
≥7812 |
四、Insulation requirements for the primaries please see table 2.
|
Rated voltage (kV) |
35 |
66 |
110 |
132 |
150 |
220 |
|
|
power-frequency withstand voltage (r.m.s) (kV) |
95 |
160 |
230 |
275 |
325 |
460 |
|
|
The wet test for the current transformer of power-frequency withstand (r.m.s) (kV) |
95 |
160 |
230 |
275 |
325 |
460 |
|
|
Rated switching impulse withstand voltage (peak) (kV) |
— |
— |
— |
— |
— |
— |
|
|
Rated lightning impulse withstand voltage (peak) (kV) |
200 |
325 |
550 |
650 |
750 |
1050 |
|
|
chopped ligtning impulse voltage (peak) (kV) |
230 |
373 |
635 |
750 |
865 |
1208 |
|
|
power-frequency withstand voltage at the SF6 gas pressure 0MPa (kV) |
30 |
54 |
95 |
109 |
128 |
190 |
|
|
Partial discharge level |
prestressing performed voltage (r.m.s) (kV) |
76 |
112 |
184 |
220 |
260 |
368 |
|
Test voltage 1.2Um or Um (kV) PD≤10pC |
49 |
87 |
126 |
145 |
170 |
252 |
|
|
Test voltage 1.2Um/√3 (kV) PD≤5pC |
28 |
50 |
87 |
100.5 |
118 |
174 |
|
五、Mechanical requirements for the primary terminals please see table 3.
|
Rated voltage (kV) |
35 |
66 |
110 |
132 |
150 |
220 |
|
|
Mechanical requirements (horizontal of two directions and vertical) (N) |
Load Ⅰ |
— |
1250 |
2000 |
2000 |
2000 |
2500 |
|
Load Ⅱ |
— |
2500 |
3000 |
3000 |
3000 |
4000 |
|
|
Applied to the primary terminals with duration (s) |
— |
60 |
60 |
60 |
60 |
60 |
|
六、Dimensions and the outline drawing of the Current Transformers.
2. Dimensions of CT
|
Rated Voltage |
A (mm) |
B (mm) |
C (mm) |
D (mm) |
E (mm) |
|
35 |
785 |
1463 |
475 |
790 |
20 |
|
66 |
785 |
1712 |
475 |
790 |
20 |
|
110 |
785 |
2212 |
475 |
790 |
20 |
|
132 |
878 |
2375 |
450 |
790 |
20 |
|
150 |
878 |
2675 |
450 |
790 |
20 |
|
220 |
881 |
3652 |
600 |
760 |
24 |
Note: There may be any change of the dimensions for the current transformers because of renewing, the clients must basis on the updated drawings.
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