This current transformer has a hermetical structure, each sealing surface has been hermetically sealed by oil resistant rubbers. In order to ensure each of connection fastened well and not to make the gaskets compressed too much, all parts of the equipment are sealed up limitedly.
This current transformer has a hermetical structure, each sealing surface has been hermetically sealed by oil resistant rubbers. In order to ensure each of connection fastened well and not to make the gaskets compressed too much, all parts of the equipment are sealed up limited. The equipment is mainly comprised of metallic bellows, device body, porcelain bushing, oil tank, primary winding terminal plate and secondary winding terminal box. The primary winding forms chain type, using the insulation structure of oilpaper.
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.
Main technical Parameters
Rated frequency:50 or 60Hz
Rated primary current:50 ~ 4000A
Rated secondary current:1 or 5A
Rated output：10~60VA
Instrument security factor(FS) :5 or 10
Accuracy limit factor:10, 15, 20, 30, 40, 50 or 60
Accuracy class for metering cores: 0.2, 0.2S, 0.5, 0.5S, 1 or 0.3, 0.6, 1.2
Accuracy class for protective cores: 5P, 10P, PR, PX, TPS, TPX, TPY, TPZ or C10, C20, C50, C100, C200, C400, C800
Rated short-time thermal current: ≤40kA/3s
Rated dynamic current: ≤100kA
Creepage distance:31mm/kV
Arcing distance and creepage distance of outer insulation please see table 1.
Table 1
|
Rated voltage(kV) |
Arcing distance(mm) |
Creepage Distance (mm) |
|
35 |
≥470 |
≥1256 |
|
66 |
≥720 |
≥2248 |
|
110 |
≥1350 |
≥3906 |
|
132 |
≥1500 |
≥4495 |
|
150 |
≥1710 |
≥5270 |
|
220 |
≥1975 |
≥7812 |
Insulation requirements for the primaries please see table 2.
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 lightning 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 |
|
Mechanical requirements for the primary terminals please see table 3.
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 |
|
Dimensions of the Current Transformers
Table 4
|
Rated Voltage |
A (mm) |
B (mm) |
C (mm) |
D (mm) |
E (mm) |
|
35 |
584 |
1770 |
258 |
424 |
14 |
|
66 |
630 |
1800 |
410 |
630 |
18 |
|
110 |
654 |
2450 |
475 |
710 |
20 |
|
132 |
654 |
2750 |
475 |
710 |
20 |
|
150 |
654 |
3050 |
475 |
710 |
20 |
|
220 |
896 |
3715 |
520 |
880 |
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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