High-voltage current limiting fuse for the short-circuit protection of oil-immersed transformer
High-voltage current limiting fuse for the short-circuit protection of oil-immersed transformer
This product applies to indoor AC 50~60Hz system with the rated voltage of 8.3 ~ 40.5kV for the short-circuit protection of transformer and other power equipment, and is used in series with the oil-immersed transformer overload protection fuse, and can provide the full range protection for indoor power system. The product has passed the type test conducted by the national high-voltage electrical equipment quality supervision and inspection center, and conforms to GB15166.2 and IEC282-1.
Model: XRNT3A-15.5(40.5)/□-50(31.5)
Basic parameters
|
Product Model |
Rated Voltage (kV) |
Rated Breaking Current (kA) |
Rated Current of Fuse Element (A) |
Standard Size |
||
|
A(mm) |
B(mm) |
φD(mm) |
||||
|
XRNT3A-15.5 |
15.5 |
50 |
31.5, 40, 50 |
248 |
216 |
φ54 |
|
63, 80, 100, 125 |
356 |
324 |
φ54 |
|||
|
150, 175 |
405 |
373 |
φ54 |
|||
|
XRNT3A-40.5 |
40.5 |
31.5 |
10, 16, 20, 25, 31.5, 40 |
570 |
537 |
φ54 |
Technical data
Fuse is normally used in transformer oil with the ambient temperature not exceeding 100℃, and fuse link is of the bolted structure.
The fuse under specified operating conditions is able to reliably break any fault current from the minimum breaking current (3～5) ln to the rated breaking current 50kA.
Time - current characteristic curve of fuse is as shown in Fig. 2 and Fig. 3.
Current limiting characteristic curve of fuse is as shown in Fig. 4.
Outline and installing dimensions
Fig.1 a) Outline drawing of XRNT3A-15.5 (40.5) fuse link
Fig. 1 b) Clamping and arrangement of XRNT3A-15.5 (40.5) fuse at oil tank
Fig. 2 XRNT3A-15.5 time - current characteristic curve
Fig.3 XRNT3A-40.5 time - current characteristic curve
Fig.4 XRNT3A current limiting characteristic curve
