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High Voltage Current-limiting Fuse For Transformer Protection

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High Voltage Current-limiting Fuse For Transformer Protection

This product is used in indoor AC system of 50Hz, rated voltage of 12kV, also can be used together with other protective electric apparatus (e.g. load switch, vacuum contactor, etc.) to protect power transformer and other electrical equipment from overloading and short-circuit.
1.Type
2.Basic parameters
The basic parameters of fuses are shown in table 1
Table 1
Type
Rated voltage (kV)
Rated Current of Fuse (A)
Rated Current of Fuse-element(A)
XRNT1-12*(SDL*J)
12
40
6.3、10、16、20、25、31.5、40
XRNT1-12*(SFL*J)
12
100
50、63、71、80、100
XRNT1-12*(SFL*J)
12
125
125
Note:
(1) * is defined by the striker
(2) ( ) is for British Standard
3.Main technical data
(1) Under the condition of specified conditions, the fuses can break any fault current from the minimum breaking current (2.5-3) Ie (rated current of fuse-element) to the rated breaking current of 50kA.
(2)Time-current characteristics curve is shown in(Fig.1),The dotted lines stand for the current above the minimum breaking current.
(3) Current-limiting characteristics curve is shown in(Fig.2).
(4)I2t characteristics are shown in(Fig.3).
4.Shape and mounting size
The shapes and dimensions of the fuses are shown in(Fig.4).
5.Selection of Fuse
The general guides for selecting fuse-element used in the primary winding of transformer are shown in
table 2.
Transformer capacitykVA
primary winding voltage of transformer (10kV)
Fuse type
Rated current of fuse-element(A)
100
XRNT1-12*(SDL-12kV)
10
125
XRNT1-12*(SDL-12kV)
10
160
XRNT1-12*(SDL-12kV)
16
200
XRNT1-12*(SDL-12kV)
20
250
XRNT1-12*(SDL-12kV)
25
300/315
XRNT1-12*(SDL-12kV)
31.5
400
XRNT1-12*(SDL-12kV)
40
500
XRNT1-12*(SFL-12kV)
50
630
XRNT1-12*(SFL-12kV)
63
750/800
XRNT1-12*(SFL-12kV)
80
1000
XRNT1-12*(SFL-12kV)
80
1250
XRNT1-12*(SFL-12kV)
100
1500
XRNT1-12*(SKL-12kV)
125
Note:
For the selection of the fuse used for7.2kV transformer and used together with other electrical equipment, please c
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