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High voltage surge arresters

Product details

Tridelta offers a wide portfolio of surge arresters for high voltage applications up to 800 kV:

All Tridelta designs feature an excellent sealing system that prevents the ingress of any moisture, ensuring decades of reliable and maintenance-free operation. The wide range of TRIDELTA arresters offers optimal surge protection for various requirements and applications such as:

Design differences

In addition to the proven SB arresters with porcelain housing, Tridelta Meidensha offers three arrester designs with silicone housing. All three designs use high quality LSR silicone that is water repellent and UV/aging resistant for life and ensures excellent impurity behavior. They also have in common a significantly lower weight compared to porcelain arresters, which makes transport easier, minimizes the risk of damage during transport and installation, and allows various installation options such as use as a line arrester.

Cage Design SBKC

General

Cage made of glass fiber rods around metal oxide varistors. Glass fiber rods are braced according to patented system and directly encapsulated with silicone. There is no internal gas volume and therefore no sealing or pressure relief device is required.

Technical Data

Mains voltage Um: up to 420 kV (for some applications also higher on request)
Fixed short time load (SSL): up to 4 kNm

Additional information

Key points:
– high safety margin with regard to electrical and mechanical overloads
– no violent destruction after overload or short circuit events
– easy transport and thus reduced transport costs
– easy and quick installation without special tools

Possible applications:
-standard applications
-excellent for use as a line arrester

Tube Design SBKT SB

General

Glass fiber tube with internal gas volume. The silicone screens are applied directly to the fiberglass tube.

Technical Data

Mains voltage Um: up to 550 kV (for some applications also higher on request)
Fixed short time load (SSL): up to 23 kNm

Additional information

Key points:
– Excellent contamination behavior due to the high hydrophobic behavior of the silicone
– highest safety reserves in case of electrical and mechanical overloads, no ejection of internal parts in case of short circuit
– 75% of the mechanical stability is retained even after a short circuit/pressure relief
– easier transport than with porcelain arresters (lower risk of damage)
– Installation similar to porcelain arresters, but lighter weight

application possibilities:
– for highest mechanical and safety requirements
– as support insulator
– Use for high seismic requirements

Querschnitte_20080317-131231_frei

General

Metal oxide varistors are braced in a cage of glass fiber rods and are fixed in a hollow insulator made of glazed porcelain. This creates a cavity which is filled with inert gas. This requires a sealing and pressure relief system.

Technical Data

Mains voltage Um: up to 800 kV
Fixed short time load (SSL): up to 35 kNm

Additional information

Key points:
– highest safety reserves in case of electrical and mechanical overloads, no ejection of internal parts in case of short circuit
– 75% of mechanical stability is retained even after short circuit/pressure relief

Possible applications:
– for highest mechanical and safety requirements
– as support insulator
– use for high seismic requirements

Technical Data

When it comes to detail …

Cage Design

Tridelta offers arresters with silicone housing in the cage design of the SBKC series for applications up to 420 kV.

Fiberglass-reinforced epoxy resin rods are fixed in the terminals using a patented process and enclose the metal oxide varistors. This cage-like structure gives the active part high mechanical strength. Direct potting of the “cage” with LSR silicone prevents moisture penetration, thus ensuring high reliability. We use high quality LSR silicone that is water repellent and UV/aging resistant for life and ensures excellent impurity behavior.

Our SBKC arresters in cage design are suitable for increased mechanical requirements and offer an excellent price/performance ratio. They can be used in substations standing or hanging, as well as in overhead lines as line arresters. High processing quality on the latest machines and testing with state-of-the-art measuring technology guarantee a long service life.

Product SBKC Design 0 SBKC Design I SBKC Design II
Highest System Voltage Um kV 170 420 800
max. Rated Voltage Ur kV 144 360 612
max. Nominal Discharge Current In (at 8/20 µs waveshape) kA 10 20 20
max. Thermal Energy Absorption Capability kJ per kV of Ur 4,5 9,2 13
max. Line Discharge Class 2 4 5
Qrs (accord. IEC 60099-4 Edt. 3.0) C 1,2 2,8 4,0
High Current Withstand Strength 4/10 µs kA 100 100 100
max. Low Current Withstand Strength 2 ms A 500 1.500 2.000
max. Short Circuit / Pressure Relief Capability kA – 0,2s 40 63 63
Mechanical Strength: Specific short-term load SSL Nm 1.200 4.000 35.000

Tube Design

Our arresters with silicone housing in the tube design of the SBKT series are available for applications up to 800 kV.

Similar to porcelain arresters, they use a hollow insulator as a housing. The so-called composite insulator consists of a glass-fiber-reinforced plastic tube to which the silicone shields are applied by means of spraying technology. Composite insulators are characterized by very high mechanical strength.

For our SBKT arresters, we use high-quality LSR silicone that is water-repellent and UV/aging resistant for life and ensures excellent impurity behavior.  An excellent sealing system prevents moisture penetration, ensuring a long service life.

Due to their very high mechanical strength, SBKT arresters from Tridelta are ideally suited for applications up to 550 kV networks as well as for highly earthquake-prone areas. Since 75% of the mechanical stability of the arrester is retained after an arrester failure, SBKT arresters can also be used for applications with a support function, in which the arrester simultaneously serves as a support in addition to its function as surge protection.

Product SBKT Design I SBKT Design II
Highest System Voltage Us kV 550 800
max. Rated Voltage Ur kV 444 624
max. Nominal Discharge Current In (at 8/20 µs waveshape) kA 20 20
max. Thermal Energy Absorption Capability kJ per kV of Ur 10 18
max. Line Discharge Class 4 5
SM,SH SM,SH
Qrs (accord. IEC 60099-4 Edt. 3.0) 3,6 4,4
High Current Withstand Strength 4/10 µs kA 100 100
max. Low Current Withstand Strength 2 ms A 1.700 2.600
max. Short Circuit / Pressure Relief Capability kA – 0,2s 65 80
Mechanical Strength: Specific short-term load SSL Nm 12.000 23.000

Porcelain

We have been manufacturing our proven SB series porcelain arresters since 1962.

Metal oxide varistors with high energy absorption capacity and an excellent sealing system ensure a long service life. Depending on the mechanical requirements, our arresters are available in three different designs:

  • Type 0 – max. permissible operating load 10 kNm
  • Type I – max. permissible operating load 23 kNm
  • Type II – max. permissible operating load 35 kNm
Product SB Design 0 SB Design I SB Design II
Highest System Voltage Um kV 420 550 800
max. Rated Voltage Ur kV 396 468 612
max. Nominal Discharge Current In (at 8/20 µs waveshape) kA 20 20 20
max. Thermal Energy Absorption Capability kJ per kV of Ur 13 13 13
max. Line Discharge Class 5 5 5
Qrs (accord. IEC 60099-4 Edt. 3.0) C 3,6 3,6 4,0
High Current Withstand Strength 4/10 µs kA 100 100 100
max. Low Current Withstand Strength 2 ms A 2.000 2.000 2.000
max. Short Circuit / Pressure Relief Capability kA – 0,2s 65 63 63
Mechanical Strength: Specific short-term load SSL Nm 10.000 23.000 35.000
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