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
Product Model	Rated Voltage (kV)	Rated Breaking Current (kA)	Rated Current of Fuse Element (A)	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
XRNT