ZGR3(XRNT5)-15.5 H.V Current-limiting back-up fuse for short-circuit protection of oil-immersed transformer

ZGR3(XRNT5)-15.5 H.V Current-limiting back-up fuse for short-circuit protection of oil-immersed transformer

General

ZGR3 ( XRNT5 ) -15.5H.V.current-limiting back-up fuse for short-circuit protection of oil-immersed transformer ( here-under fuse ) is available for H. V. indoor electric system , with rated voltage 15.5KV , rated current up to 175A ,50HZ a.c..It is used for protecting from short-circuit for power transformer .It can offer protection of all-round together in series with ZGR4 ( PRNT13 ) -15.5H.V. fuse for overload protection of oil-immersed transformer .

Standard

Accord with GB15166.2 Alternating-current high-voltage fuses Current-limiting fuse

Basic parameters

Working conditions: The fuse element is normally used in transformer oil, and the upper temperature limit of the surrounding oil does not exceed 100 ℃

Order number

Type instruction

Performance

Fuse can’t be used alone . It must be used in series with the back-up fuse to become protection of all-around.In using,the characteristic of the fuse and the back-up fuse must be considered enough .

Figure the time-current characteristic of the fuse and the back-up fuse . A in figure is a point of the meeting two curves . B is min.breaking capacity current of the back-up fuse-link . C is rated max. breaking capacity current of the fuse .

When fuse will be used in series with the back-up fuse-link , first the point A must be existence , second the point B is above the point A and the point C is below the point A.

Order number

Coordination diagram of fuse and backup fuse protection characteristics

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