The product can be used in system with Ac 50Hz and rated voltage of 10KV, used together with other protection electric facilities (such as loading switches). it can protect electric transformers and other electric facilities against overloading or circuit break. It is mainly used in America style box transformers as backup protection.
◆Basic parameters
See chart for the fuse of basic parameters
Type |
Rated voltage (KV) |
Max working voltage KV |
Fuse rated current KA |
Rated current of fuse link A |
OFG |
10 |
12 |
125 |
63, 80, 100, 125 |
200 |
160, 200 |
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 poower transformer.It can offer protection of all-round together in series with ZGR4 (PRNT13)-15.5 H.V. fuse for overload protection of oil-immersed transformer.
Accord with GB15166.2 Alternating-current high-voltage fuses Current-limiting fuse.
◆Order number
Rated Current (A) |
Order Number |
31.5 |
ZGR3-31.5 |
40 |
ZGR3-40 |
50 |
ZGR3-50 |
63 |
ZGR3-63 |
80 |
ZGR3-80 |
100 |
ZGR3-100 |
125 |
ZGR3-125 |
150 |
ZGR3-150 |
175 |
ZGR3-175 |
◆Basic parameters
Rated voltage KV |
Fuse rated current A |
Melt rated current A |
Dimensions |
Rated short-circuit breaking current A |
17.2 |
125 |
31.5, 4,50, 63, 80, 100, 125 |
图1 |
50 |
175 |
150, 175 |
图2 |
Normal working conditions: The fuse is normally used in transformer oil, and the upper limit of the temperature of the surrounding oil does not exceed 100℃
◆Selection of fuse
Recommended selection of ZGR3 and ZGR4 fuses
General selection guide for primary-side fuses of 10KV oil-immersed transformers:
Transformer capacity (KVA) |
Rated current (A) |
ZGR3 rated current (A) |
ZGR4 rated current (A) |
50 |
2.75 |
31.5 |
6.3 |
100 |
5.5 |
40 |
10 |
160 |
8.8 |
63 |
16 |
200 |
11.0 |
80/63 |
25A |
250 |
13.7 |
80 |
25A |
315 |
17.3 |
100 |
40A |
400 |
22.0 |
125 |
40A |
500 |
27.5 |
150 |
50A |
630 |
34.6 |
175 |
63A |
800 |
44.0 |
100 double pin |
63A |
1000 |
55.0 |
100 double pin |
100A |
1250 |
68.7 |
125 double pin |
100A |
◆Construction
The fuse is a bolt connection structure
The fuse is composed of melt, melt tube, cap, quartz sand, skeleton, sealing ring, etc. The melt is processed from pure silver into a high-precision tape with variable cross-section. The melt is wound on the skeleton in an orderly manner and placed in the melting tube, which is filled with quartz sand as the arc extinguishing medium. In order to adapt to the use of immersion in transformer oil, a sealing ring is used between the cap and the melting tube, and the oil-resistant, high-temperature adhesive is used for bonding, and two sealing lines are set to ensure reliable sealing.
◆Installation, use and maintenance of fuse
Recommended horizontal installation of the fuse
When the fuse is broken, it must be replaced with a new fuse with the same model size and parameters. Do not replace it with other devices. When replacing the fuse, it is normal to find that the fuse tube of the fuse turns yellow.
For three-phase fuses installed, unless it has been confirmed that only one of the fuses has undertaken the fault current, even if one fuse operates, the other two should be replaced.
The rated current of the fuse is 175A. When the user needs a larger current level, it is recommended to use a double pin fuse. At the same time, when using Shuangpin, the mutual influence factors of temperature should be considered. Generally, the fuse should be reduced by 10%-20%.
◆Order number
Rated current |
Fuse-link Order number |
Fuse-base Order number |
6.3 |
STR4-6.3 |
STR4-D |
10 |
STR4-10 |
|
16 |
STR4-16 |
|
25 |
STR4-25 |
|
40 |
STR4-40 |
|
50 |
STR4-50 |
|
63 |
STR4-63 |
|
100 |
STR4-100 |
|
140 |
STR4-140 |
◆Basic parameters
Rated voltage 15.5 |
MAX. voltage 17.2 |
Rated current of the fuse-link 140 |
Rated current of the fuse-element 6.3、10、16、25、40、50、63、100、140 |
Operating condition in the transformer oil |
|
Rated short-circuit breaking capacity current 2.5 |
The two functions of a fuse are overcurrent protection and isolation. The function of a fuse cu...
High voltage fuse links is composed of conductor material, insulating material and circuit brea...
The structural components of high-voltage fuses mainly include melt, fuse tube, contact conduct...
As we all know, fuses are the most commonly used protection devices in power systems. So how to...
How does a low-voltage fuse work? Decipher the working principle and function of the fuse!A fus...
How many kv are high voltage fuses widely used in?High-voltage fuses are widely used in 3-35kV ...
Shanghai Zhiguang Fuse Co., Ltd provides related answers to questions such as what are the fact...
Welcome to Shanghai Zhiguang Fuse Co., Ltd. We are a low-voltage fuse manufacturer in China. Ma...