General
The indoor fuse bases are used as a fuse fixture installed in a MV electrical circuit, generally at transition points from an overhead into a cable line, or when connecting transformers to the line.
Güral MV Indoor Fuse Bases offer robust and reliable solutions for medium – voltage systems. The 1 and 3-pole indoor fuse bases are applicable for a wide range system voltages from 12 kV to 36 kV with rated currents 2 to 300 A. The rated short time current up to 50 kA for a duration of 3 s depending on the model has been tested.
Base
MV Indoor Fuse Base consists of single or three poles. Single and three poles fuse bases consist of a base, a number of fixed support insulators depending on type of disconnector and a number of fuse holders depending on number of phases. All steel parts of the fuse bases are hot-dip galvanized or electrogalvinized.
Fuse-Base Contacts
All the current-carrying parts (fuse-base contacts and terminal contacts) of the fuse bases are made of galvanic silver-coated electrolytical copper. Copper contacts are pressed by means of two spiral springs depending on required contact pressure due to short-circuit capability, ensure that the current is transferred from the fuse-base contacts into fuse-link contacts. This contact construction is maintenance free.
The contacts are self-cleaning, which makes the fuse bases suitable for installation in all areas with severe climatic conditions.
Insulators
The fuse-bases can be equipped with insulators in accordance with IEC, ANSI or DIN specifications.
Remote indication
Depending on client’s requirement all Güral three phase MV indoor fuse bases can be equipped with mechanism for remote indication of the fuse tripped state. Check of the trip indication (only for fuse bases equipped with this function)is done either by pushing the trip mechanism or using the test fuse cartridge. After tripping the fuse base has to indicate the fuse tripping state. The test is carried out on all three poles.
Testing
Indoor fuse-bases are designed and tested in accordance with latest IEC standards.
Installation
Fuse-bases are completely assembled and adjusted in our workshops. Its design permits both vertical and horizontal mounting.
The construction is designed so that all fuse bases can be installed at site very easily, without the need of any special tools. For each switchgear an instruction manual for transportation, mounting and commissioning is enclosed. This instruction manual should be strictly followed.
Maintenance
The fuse bases supplied by Güral are designed so as to ensure that they are maintenance free. However, to guarantee a long and trouble-free service period, we advise that a visual inspection of the contacts and bearing points be carried out at regular intervals.
Technical Data
Rated Voltage |
Ur(kV) |
12 |
17.5 |
24 |
36 |
Power Frequeny Withstand Voltage |
|
- to earth and between sphases |
Ud(kV) |
28 |
38 |
50 |
70 |
- across isolating distance |
Ud(kV) |
32 |
45 |
60 |
80 |
Lightning Impulse Withstand Voltage |
|
- to earth and between phases |
Up(kV) |
75 |
95 |
125 |
170 |
- across isolating distance |
Up(kV) |
85 |
110 |
145 |
195 |
Rated Current |
Ir(A) |
Up to 300 |
Rated Short-time Withstand Current |
Ik(kA) |
Up to 50kA/3s |
Rated Peak Withstand Current |
Ip(kA) |
Up to 125 |
Single Pole Fuse Bases
|
Dimensions (mm) |
Type |
A |
B |
C |
D |
DSA12 |
325 |
491 |
130 |
575 |
DSA17.5 |
475 |
641 |
175 |
725 |
DSA24 |
475 |
641 |
210 |
725 |
DSA36 |
570 |
736 |
300 |
820 |
THREE POLES FUSE BASES
|
Dimensions (mm) |
Type |
A |
B(*) |
C |
D |
E |
H |
DSA12 |
325 |
210 |
210 |
586 |
575 |
290 |
DSA17.5 |
475 |
280 |
175 |
746 |
725 |
335 |
DSA24 |
475 |
300 |
210 |
746 |
725 |
370 |
DSA36 |
570 |
400 |
300 |
986 |
820 |
460 |
Dimensions (mm)
Dimensions having (*) is changing acc.to client’s specifications.
THREE POLES FUSE BASES WITH REMOTE INDICATION
|
Dimensions (mm) |
Type |
A |
B(*) |
C |
D |
E |
H |
DSA12 |
415 |
210 |
210 |
586 |
555 |
340 |
DSA17.5 |
565 |
280 |
175 |
746 |
705 |
385 |
DSA24 |
565 |
300 |
210 |
746 |
705 |
420 |
DSA36 |
660 |
400 |
300 |
986 |
800 |
510 |
Dimensions (mm)
Dimensions having (*) is changing acc.to client’s specifications.
|
s
