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Full range high-voltage current limiting fuse for protection of dedicated new-energy 12kV oil-immersed transformer

Product description: These technical conditions apply to the full range high-voltage current limiting fuse (hereinafter referred to as fuse) for XRNT3A-12 transformer protection. This product applies to AC 50 ~ 60Hz power system with the rated voltage of 12kV as short-circuit and overload protection element for power transformer and other power equipment. It is mainly mounted in the 12kV American box transformer and may share the box with other electrical elements.Normal operating conditions1) Maximum ambient air temperature is 40℃ and the lowest is -40℃;2) Altitude is not more than 1000m;3) Relative humidity: daily average is not more than 95%, and the monthly average is not greater than 90%;4) Surrounding air is not excessively polluted by the dust, smoke, corrosive or flammable gas, steam or salt fog;5) When the fuse is used in transformer oil, the ambient temperature of transformer oil shall not exceed 105℃.Model description  (Note: “/S” after the rated current means the blown fuse indication and signal output functions, and “/H” after “S” means the application to high-altitude products, i.e. H1 means the altitude greater than 1000m and less than or equal to 2000m, H2 means the altitude greater than 2000m and less than or equal to 3000m and H3 means the altitude greater than 3000m and less than or equal to 4000m)Basic parameters ModelRated Current of Fuse (A)Rated Current of Fuse Link (A)No.Rated Voltage (kV)Rated Maximum Breaking Current (kA)XRNT3A-12(ZLR10-12)10016, 20, 25, 31.5, 40, 50, 63, 80, 100Fig.11250125125Fig.2 Installation and use description:The specifications of mounting holes of fuse on the transformer box are as follows: φ100+1.5   0(16~63A)、φ120+1.5   0(63~80A). Four M10×45 mm bolts (M10 blind screw hole) are arranged around the round hole with the spacing between the bolts (screw holes) as 115×115±0.5㎜(16~100A) and 130×130±0.5mm (125A), and the positions of four bolts (screw holes) are concentric with the mounting holes; After the fuse is mounted into the box, the adequate insulation distance shall be maintained between the outer skins of fuse bracket shell and between the outer skin of bracket shell/ends and the inner wall of transformer oil tank/out-phase cable;Fuse is installed horizontally and is perpendicular to the panel of transformer box. The part of fuse into the tank shall be immersed in the transformer insulation oil and reliably supported with the insulation bracket (supplied by user, see Fig.1 and Fig. 2).Installing steps:1. The insulation bracket shall be (supplied by user) installed in the transformer box according to Fig.1 and Fig. 2, or the fuse is prone to sag due to the self weight, causing the uneven force between the sealing ring and panel or breakage at the root of fuse bracket flange, thus leading to the oil spill.2. Fit the sealing ring into the fuse bracket and through the corresponding hole on the box to make the fuse bracket perpendicular to the box panel, and tighten four fixing nuts, and then tighten the insulation bracket with the nylon cable ties or insulation tape.3. Connect the front and rear terminals of fuse in series to the return conductor, and tighten the screws moderately;4. Before inserting the fuse link, check the threaded connection between the fuse link and fuse element carrier for looseness. Fuse link metal cap surface and the conductive contact surface of fuse element carrier shall be clean. Then make the arrow direction on the lid of fuse element carrier aligned with that on the aluminum gland. Hold the handle and fuse link respectively with one hand each and insert it lowly into the fuse bracket, and then pull down the handle to lock it.5. Connect the intermediate, normally-close and normally-open contacts on the lid.Rational use:1. The rated current of fuse link is from 16A to 125A, and the greater rated current may be achieved through the double-parallel mode. 2. When replacing the fuse link, do not switch to on-load circuit when it is uncharged;3. For the three-phase system, w hen the fuse of one phase acts, generally replace all three phases unless you can confirm that the fault current passes through one phase. In the replacement of fuse link, the fusion tube getting yellow or darker is normal.Selection of fuseGeneral Principle for Fuse SelectionRated Voltage  (kV)Rated Capacity of Transformer (kVA)16020025030040050063080010001250Rated Current of Fuse (A)1216202531.540506380100125
Model: XRNT3A
Type: Full Range High Voltage Current-Limited Fuse
Applicable: High Voltage
Colour:
Origin:
XiangYuan ZhenLi
  • Parameter
  • Specification
  • Service

These technical conditions apply to the full range high-voltage current limiting fuse (hereinafter referred to as fuse) for XRNT3A-12 transformer protection. This product applies to AC 50 ~ 60Hz power system with the rated voltage of 12kV as short-circuit and overload protection element for power transformer and other power equipment. It is mainly mounted in the 12kV American box transformer and may share the box with other electrical elements.

Normal operating conditions

1) Maximum ambient air temperature is 40and the lowest is -40;

2) Altitude is not more than 1000m;

3) Relative humidity: daily average is not more than 95%, and the monthly average is not greater than 90%;

4) Surrounding air is not excessively polluted by the dust, smoke, corrosive or flammable gas, steam or salt fog;

5) When the fuse is used in transformer oil, the ambient temperature of transformer oil shall not exceed 105.

Model description

 新能源专用12kV油浸式变压器保护用全范围高压限流熔断器

 (Note: “/S after the rated current means the blown fuse indication and signal output functions, and “/H” after S means the application to high-altitude products, i.e. H1 means the altitude greater than 1000m and less than or equal to 2000m, H2 means the altitude greater than 2000m and less than or equal to 3000m and H3 means the altitude greater than 3000m and less than or equal to 4000m)

Basic parameters

Model

Rated Current of Fuse (A)

Rated Current of Fuse Link (A)

No.

Rated Voltage (kV)

Rated Maximum Breaking Current (kA)

XRNT3A-12

(ZLR10-12)

100

16, 20, 25, 31.5, 40, 50, 63, 80, 100

Fig.1

12

50

125

125

Fig.2

 

Installation and use description:

The specifications of mounting holes of fuse on the transformer box are as follows: φ100+1.5   0(16~63A)、φ120+1.5   0(63~80A). Four M10×45 mm bolts (M10 blind screw hole) are arranged around the round hole with the spacing between the bolts (screw holes) as 115×115±0.5(16100A) and 130×130±0.5mm (125A), and the positions of four bolts (screw holes) are concentric with the mounting holes; 

After the fuse is mounted into the box, the adequate insulation distance shall be maintained between the outer skins of fuse bracket shell and between the outer skin of bracket shell/ends and the inner wall of transformer oil tank/out-phase cable;

Fuse is installed horizontally and is perpendicular to the panel of transformer box. The part of fuse into the tank shall be immersed in the transformer insulation oil and reliably supported with the insulation bracket (supplied by user, see Fig.1 and Fig. 2).

Installing steps

1. The insulation bracket shall be (supplied by user) installed in the transformer box according to Fig.1 and Fig. 2, or the fuse is prone to sag due to the self weight, causing the uneven force between the sealing ring and panel or breakage at the root of fuse bracket flange, thus leading to the oil spill.

2. Fit the sealing ring into the fuse bracket and through the corresponding hole on the box to make the fuse bracket perpendicular to the box panel, and tighten four fixing nuts, and then tighten the insulation bracket with the nylon cable ties or insulation tape.

3. Connect the front and rear terminals of fuse in series to the return conductor, and tighten the screws moderately;

4. Before inserting the fuse link, check the threaded connection between the fuse link and fuse element carrier for looseness. Fuse link metal cap surface and the conductive contact surface of fuse element carrier shall be clean. Then make the arrow direction on the lid of fuse element carrier aligned with that on the aluminum gland. Hold the handle and fuse link respectively with one hand each and insert it lowly into the fuse bracket, and then pull down the handle to lock it.

5. Connect the intermediate, normally-close and normally-open contacts on the lid.

Rational use:

1. The rated current of fuse link is from 16A to 125A, and the greater rated current may be achieved through the double-parallel mode. 

2. When replacing the fuse link, do not switch to on-load circuit when it is uncharged;

3. For the three-phase system, w hen the fuse of one phase acts, generally replace all three phases unless you can confirm that the fault current passes through one phase. In the replacement of fuse link, the fusion tube getting yellow or darker is normal.

Selection of fuse

General Principle for Fuse Selection

Rated Voltage

 (kV)

Rated Capacity of Transformer (kVA)

160

200

250

300

400

500

630

800

1000

1250

Rated Current of Fuse (A)

12

16

20

25

31.5

40

50

63

80

100

125



Outline and installing dimensions

Outline and installing dimensions of fuse are as shown in Fig. 1 and Fig. 2.

新能源专用12kV油浸式变压器保护用全范围高压限流熔断器 

 Fig. 1 a) Outline drawing of XRNT3A(ZLR10)-12/16100A fuse link

新能源专用12kV油浸式变压器保护用全范围高压限流熔断器 

Fig.1 b) Outline and installing dimensions of XRNT3A(ZLR10)-12/16100A fuse

新能源专用12kV油浸式变压器保护用全范围高压限流熔断器

Fig.2 a) Outline drawing of XRNT3A(ZLR10)-12/125A fuse link

新能源专用12kV油浸式变压器保护用全范围高压限流熔断器 

Fig.2 b) Outline and installing dimensions of XRNT3A(ZLR10)-12/125A fuse

Main technical data

The fuse under specified operating conditions is able to reliably break any fault current from the minimum fusion current to the rated breaking current 50kA.

Fuse is of the plug-in structure and consists of the fuse link, fuse element carrier and bracket shell.

The temperature of transformer oil around the fuse shall not exceed 105, and when the ambient temperature is higher than 40, the fuse shall derate by 1% for every 1rise.

新能源专用12kV油浸式变压器保护用全范围高压限流熔断器

Fig.3 time-current characteristic curve 


XRNT3A

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