630A/24kV Disconnectors

Description

   The medium voltage (24kV), 630A, vertical break, manually operated disconnector is used in 20kV/24kV overhead distribution lines for isolation purposes according to IEC 62271-102 & IEC 60694 (IEC 62271-1) standards.

  Τhey are installed at both sides of the main 150/20kV substation circuit breaker.

  They are manufactured in order to withstand the harshest environmental conditions and high pollution levels.

  The base of the disconnector and all non current carrying parts are made by formed hot dip galvanized steel. The insulators are made of high quality brown porcelain. The disconnector's contacts, terminals and blade are made of tin-plated copper. The contacts are self cleaning and always maintain constant pressure and once secured in the closed position can withstand seismic, wind and other vibrational forces without opening. All screws, nuts and washers are made of hot-dip galvanized steel to ensure long and trouble free operation.

  This type of disconnector has been manufactured by our company for more than 20 years. Our products have been operating trouble-free in the Greek power grid throughout all this time.

  The disconnectors can operate under the following conditions:

Electrical characteristics

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2000A/24kV Disconnectors

 Description

  The medium voltage (24kV), 2000A, vertical break, manually operated disconnector is used in 20kV/24kV overhead distribution lines for isolation purposes according to IEC 62271-102 & IEC 60694 (IEC 62271-1) standards. Τhey are installed at both sides of the main 150/20kV substation circuit breaker.

  They are manufactured in order to withstand the harshest environmental conditions and high pollution levels. The base of the disconnector and all non current carrying parts are made by formed hot dip galvanized steel.

  The insulators are made of high quality brown porcelain.

  The disconnector's contacts, terminals and blade are made of tin-plated copper.

  The contacts are self cleaning and always maintain constant pressure and once secured in the closed position can withstand  seismic, wind and other vibrational forces without opening.

  All screws, nuts and washers are made of hot-dip galvanized steel to ensure long and trouble free operation.

  This type of disconnector has been manufactured by our company for more than 20 years. Our products have been operating trouble-free in the Greek power grid throughout all this time.

  The disconnectors can operate under the following conditions:

Electrical characteristics

Rated voltage(kV):20

Maximum voltage(kV):24

Rated frequency(Hz):50

Rated current(Α):2000

Short circuit level: 10kA(rms) / 25kA(peak)

Short circuit duration(sec): 3

Insulation level(kV): 24/50(60)/125(165)

Mechanical endurance: 1000 operations

Type test reports

 Our products have sucessfully been type tested and have been awarded the relevant type test certificates.

 

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  420kV Outdoor, knee type, single pole, AC disconnector with electric motor operating mechanism

Description

  The disconnector is single-pole, knee type with a two piece folding blade and two cylindrical post insulators installed on a common hot dip galvanized steel base, one rotating insulator and integrated earthing switch.

  The two cylindrical post insulators are equipped with corona rings in order to level off the electric field. The rotating insulator rotates in order to transmit the motion to the blade securely.

  The operating mechanism of the disconnector is driven by an electric motor via metallic gearwheels and can be operated locally and remotely.

  There is also a manual emergency operation that is carried out via rotary motion and reduction gears using a hand-handle.

  The operating mechanism is equipped with auxiliary switches.

  The extra heavy aluminum arm consists of two pieces and in the open position folds upon itself in a vertical position. Counterbalancing springs are used to balance the weight of the movable parts.

  All the contacts used are made of silver plated copper, are replaceable and self cleaning and are designed so that short circuit currents increase their contact pressure. When in the closed position they are able to withstand seismic and wind forces, forces exerted by the tension of the wires and due to temperature variations.

  A flexible tin plated copper strip is used to earth the disconnector to the substation earthing.

  The earthing switch is single pole and linked directly to the disconnector and can be electrically or, in case of emergency, manually operated.

  The disconnector, when installed, is mounted on a steel structure as shown in the attached schematics. STALCO SA has been producing this type of disconnector for many years.

  Throughout all this time they have operated optimally and without problems in the field. The product has been type tested according to the relevant EC standards (EC 62271-102 & EC 60694).

  The production facilities include a state of the art testing laboratory in which the required routine tests are conducted to each disconnector.

  The design and integrated equipment of the disconnector can be adapted according to our clients' requirements.

SERVICE CONDITIONS

ELECTRICAL CHARACTERISTICS

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