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General
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Centre Break Disconnector is the most frequently used disconnector type in many HV substations.
Güral CBD Series Center Break Disconnectors offer robust and reliable solutions for high – voltage systems. With variations designed to serve for a wide range of system voltages, Güral CBD Series Center Break Disconnectors currently operate worldwide at system voltages from 72.5kV to 550kV.
The flexibility of the design of Güral CBD Series Center Break Disconnectors allows almost any custom solutions requested by the client, including earthing capabilities of load, supply or both terminals, insulation levels, driving variations and construction assembly types.
GÜRAL-ALPHA disconnectors can be fitted in parallel, in line or even shifted crosswise layouts.
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Base |
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Centre break disconnector consists of one or three poles. Each pole consists of a base, two rotating support insulators and a main blade that moves in a horizontal plane.
The base is made of two NPU profiles in which the bearing housing and the rotating part are installed. The bearing housing is supported by two ball bearings for high mechanical loads. The bearing housing is sealed and filled up with special lubricant, to ensure a long and maintenance-free lifetime. All steel parts of the disconnector are hot-dip galvanized.
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Insulators |
The disconnectors can be equipped with insulators in accordance with IEC, ANSI or DIN specifications.
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Current Carrying Part |
The main blade consists of an aluminium rectangular tube , in which the main contacts and the rotating contacts are installed.
The rotating cylindrical contacts are pressed by means of two pieces of folded contacts and stainless steel flat springs, ensure that the current is transferred from the cylindrical and folded contacts into aluminium rectangular tube . This contact construction is sealed and maintenance free.
The main contacts are installed inside the main blade. They are made of copper, with a silver plated surface.
Each finger contact is provided with stainless steel springs to ensure reliable contact pressure.
The contacts are self-cleaning, which makes the disconnector suitable for installation in areas with severe climatic conditions.
Depending on the voltage rating, anti-corona rings will be provided.
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Earthing Switch |
GÜRAL centre break disconnectors may be equipped with earthing switches, which can be built-on to the right and/or left hand side.
The earthing switch consists of an aluminium round or square tube, provided with silver-plated copper contact. A mechanical interlocking is provided between Disconnector and Earthing switch.
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Operating Mechanism |
The disconnectors and/or earthing switches can be single-pole or gang operated by means of a motor-operated drive mechanism or a manual-operated drive mechanism.
In case only one drive mechanism is used for gang operation, the poles are interconnected by means of coupling rods.
MD Series motor drives and HD series hand drives have aluminium housings and special design auxiliary switches. MD series motor drives also have manual operation by a crank.
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Testing |
The centre break disconnectors and earthing switches are designed and tested in accordance with latest IEC standards.
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| Installation |
The centre break disconnectors and earthing switches are preassembled and adjusted in our workshops as complete as possible.
The construction is designed so that all disconnectors can be installed at site very easily, without the need of any special tools. GÜRAL provides installation instructions and assembly drawings.
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Maintenance |
The disconnectors and earthing switches 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.
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Technical data and dimensions |
Rated Voltage |
Ur (kV) |
72.5 |
123 |
145 |
170 |
245 |
300 |
362 |
420 |
550 |
Power Frequeny Withstand Voltage |
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| - to earth and between phases |
Ud(kV) |
140 |
230 |
275 |
325 |
460 |
460 |
460 |
520 |
620 |
| - across isolating distance |
Ud(kV |
160 |
265 |
315 |
375 |
530 |
530 |
530 |
610 |
800 |
Lightning Impulse Withstand Voltage |
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| - to earth and between phases |
Up(kV) |
325 |
550 |
650 |
750 |
1050 |
1050 |
1175 |
1425 |
1550 |
| - across isolating distance |
Up(kV) |
375 |
630 |
750 |
860 |
1200 |
1050 |
1175 |
1425 |
1550 |
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+170 |
+205 |
+240 |
+315 |
Switching Impulse Withstand Voltage |
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| - to earth and between phases |
Us(kV) |
- |
- |
- |
- |
- |
850 |
950 |
1050 |
1175 |
| - across isolating distance |
Us(kV) |
- |
- |
- |
- |
- |
700 |
800 |
900 |
900 |
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+245 |
+295 |
+345 |
+450 |
Rated Current |
Ir(A) |
Up to 4000 A |
Rated Short-time Withstand Current |
Ik(kA) |
Up to 63 kA/3s |
Rated Peak Withstand Current |
Ip(kA) |
Up to 160 kA |
Dimensions (mm) |
A |
950 |
1550 |
1800 |
2050 |
2700 |
2700 |
3500 |
4000 |
4500 |
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B |
770 |
1220 |
1500 |
1700 |
2300 |
2300 |
2900 |
3350 |
4000 |
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C |
940 |
1410 |
1690 |
1902 |
2620 |
2620 |
3278 |
3728 |
4378 |
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D |
600 |
1330 |
1600 |
1750 |
2300 |
2300 |
3100 |
3720 |
4820 |
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E |
- |
- |
- |
- |
230 |
230 |
230 |
320 |
320 |
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F |
160 |
160 |
160 |
160 |
230 |
230 |
230 |
320 |
320 |
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G |
4Ø18 |
4Ø18 |
4Ø18 |
4Ø18 |
8Ø18 |
8Ø18 |
8Ø18 |
8Ø22 |
8Ø22 |
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H |
520 |
820 |
950 |
1080 |
1400 |
1400 |
1750 |
2225 |
2320 |
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