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General
Güral introduces air insulated SD/ SDE Series Indoor Switch-Disconnectors of normal and with earthing blade types: a solid and compact solution for medium voltage systems. The design combines leading compactness of its class with maximum electrical and mechanical endurances as described in the relevant standards, allowing the latest dimensions needed for the metal clad / metal enclosed switchgear.
For many years Güral indoor switch-disconnectors have guaranteed an excellent position in switchgear engineering. These switch-disconnectors master the daily loads exerted under normal switching duty - for interrupting ring feeders, disconnecting network transformers and such - with very high operating frequencies and a minimum amount of maintenance. These switch-disconnectors are distinguished by simple design, absolute reliability in operation and easy actuation.
The indoor switch-disconnectors are fitted with an energy storage mechanism for quick-make and quick-break operation.
Product Information
GÜRAL "SD" SWITCH DISCONNECTOR
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Type Designation |
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| Rated Voltage |
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12, 17.5, 24, 36kV |
| Rated Frequency |
fr |
50/60Hz |
| BIL |
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75, 95, 125, 170kV |
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Main Switch Specifications |
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| Rated Normal Current |
Ir |
630A |
| Rated Mainly Active Load-Breaking Current |
I1 |
630A |
| Rated Closed-Loop Breaking Current |
I2a |
630A |
Rated Cable-Charging Breaking Current |
I4a |
20A |
| Rated Short-time Withstand Current |
Ik |
20kA |
| Rated Duration of Short-Circuit |
tk |
1s |
| Rated Peak Withstand Current |
Ip |
52kA |
| Rated Short-Circuit Making Current |
Ima |
41.6kA |
| Class |
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E3 |
| Mechanical Endurance Class |
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| Temperature Class |
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minus 25°C indoor |
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GÜRAL "SDE" SWITCH DISCONNECTOR WITH EARTHING SWITCH
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Type Designation |
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| Rated Voltage |
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12, 17.5, 24, 36kV |
| Rated Frequency |
fr |
50/60Hz |
| BIL |
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75, 95, 125, 170kV |
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Main Switch Specifications |
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| Rated Normal Current |
Ir |
630A |
| Rated Mainly Active Load-Breaking Current |
I1 |
630A |
| Rated Closed-Loop Breaking Current |
I2a |
630A |
Rated Cable-Charging Breaking Current |
I4a |
20A |
| Rated Short-time Withstand Current |
Ik |
20kA |
| Rated Duration of Short-Circuit |
tk |
1s |
| Rated Peak Withstand Current |
Ip |
52kA |
| Rated Short-Circuit Making Current |
Ima |
41.6kA |
| Class |
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E3 |
| Mechanical Endurance Class |
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| Temperature Class |
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minus 25°C indoor |
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Earthing Switch Specifications |
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| Class of Earthing Switch |
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E0 |
| Mechanical Endurance Class |
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M1 |
| Rated Short-time Withstand Current |
Ik |
20kA |
| Rated Duration of Short-Circuit |
tk |
1s |
| Rated Peak Withstand Current |
Ip |
52kA |
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ARC EXTINGUISHING CHAMBER
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- The arc extinguishing chamber of SD & SDE Series Switch Disconnectors is optimized MV solutions not only for reliable load breaking operations, but also for making under heavy fault conditions and short circuit withstanding issues.
- The chamber uses a self-puffer system enabling long range variable and load sensitive automatic cooling capacity arrangement, making possible to maintain the correct breaking performance for all load conditions: varying between the low pure capacitive / inductive charging currents at very low cos? values to extreme loads up to 39.3 MVA.
- The arc extinguishing chamber is composed of non-flammable long endurance materials to maximize the in-cell security.
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Making & Withstand Capacity |
- Güral SD&SDE Series Switch Disconnectors are Class E3 devices (5 closing at Ima) and are tested and proved to close safely on short circuits having the most severe peak currents as specified in the relevant standards. The making capacity of SD and SDE is 41.6kApeak.
- Closing safely under any type of normal load conditions are also tested and proved, as Class E3 devices, both series of SD and SDE are tested to close to 100% mainly active load for 100 times, and all other required test of many closings under various voltage levels and load conditions.
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Type |
Main Switch |
Earthing Blade |
SD |
Class E3, 5 Closing to Ima, Ik = 20kA, 1 sec |
Not applicable |
SDE |
Class E3, 5 Closing to Ima, Ik = 20kA, 1 sec |
Class E0, Ik = 20kA, 1 sec |
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Breaking Capacity
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For convenient and reliable breaking at site, the auto-adjusting cooling range is essential for all types of circuit breakers and switch disconnectors. Güral SD & SDE Series Switch Disconnectors equipped with the highly optimized breaking chamber having the requirements above, assures the safe operation of breaking under any load condition in the range specified below:
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- Up to 39.3 MVA Inductive breaking at cos
 = 0.7
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- Up to 7,5 MVA Closed-loop currents at cos= 0.3
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- Up to 1,25 MVAr pure capacitive currents.
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- Up to 25 MVA Transfer currents at cos= 0.4
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Mechanical Endurance
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Type |
Main Switch |
Earthing Blade |
SD |
Class E3, 1000 CO |
Not applicable |
SDE |
Class E3, 1000 CO |
Class E3, 1000 CO |
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Main Switch Operation |
The operation principle for main switch operation systems of SD & SDE switch disconnectors are same; the energy needed for the closing and opening operations are given to system during the closing operation; after closing of the main blades, the energy needed for manual or motor operation is held stored on the mechanism.
The driving shaft needs a rotation angle of 90° for the full operation.
Operation steps on intended operation cases are shown below; simply the closing command will operate the main blades and close the circuit, and the opening command will make the switch break the circuit. This operation figure is valid for all SD & SDE series switch disconnectors, whether operated manually or by motor drives. |
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Earthing Blade Operation |
Type SDE switch disconnectors are equipped with earthing blades integrated within the product, which can be operated both manually or by motor drives. The operation principle for earthing blades for all types are similar: The energy needed for the closing or fast closing (if available) operation of the earthing switch is stored during the opening operation, and this energy is released when the operator commands the earthing switch to close.
The earthing blade driving mechanism needs a rotation angle of 90° for the full operation. |
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The figure above summarizes the operating steps of the earthing switches, whether the earthing switch is normal or fast closing type, there will be no operating before the operator gives command. |
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Mechanical interlock |
The operation safety of the earthing switch of SDE switch disconnector is obtained by the mechanical interlock between the earthing switch and the main switch, which prevents the accidental operations and short circuits, by making the main switch impossible to close while the earthing switch is also closed.
Assembly & Comissioning
- SD & SDE Switch Disconnectors are designed to minimize the assembly and comissioning procedure. The leading compactness and integration allows the customers to commission the products with minimum possible assembly steps and adjustments.
- SD & SDE Switch Disconnectors can be operated both with various types of hand and motor drives, the drive – switch connections allow the easy connection of main switch and earthing switch (if available) to the drive shaft.
- Each unit of SD & SDE arrives with detailed guides, explaining every step of assembly and commissioning procedures throughly.
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Maintenance
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- SD & SDE Switch Disconnectors require minimum inspection and maintenance actions; most of the sub-assemblies are maintenance free, and it is sufficient to make some essential inspections and apply maintenance actions twice a year.
- In case of need, spare parts are easy to be obtained, and the material needed for maintenance is widely available.
- The inspections and maintenance actions needed to be carried out on the units are explained in detail within the product guides.
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Dimensions (mm)
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Type |
Drawing |
Dimensions (mm) |
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A |
B |
C |
SD/SDE12 |
Fig.1 |
210 |
559 |
724 |
SD/SDE17.5 |
Fig.1 |
275 |
689 |
854 |
SD/SDE24 |
Fig.1 |
275 |
689 |
854 |
SD/SDE36 |
Fig.2 |
275 |
689 |
854 |
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