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Home arrow Electrical equipment arrow M.V. & H.V. disconnectors
630A/24kV disconnectors PDF 
disconnector
 

 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:

Ambient temperature (oC): from -25 to +45

Altitude from sea level(m): 1000

Relative humidity: less than 95%

Ice coating (mm): max 10

Pollution level: moderate to heavy

Wind speed: 150km/h

Electrical characteristics

Rated voltage(kV):20

Maximum voltage(kV):24

Rated frequency(Hz):50

Rated current(Α):630

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

Short circuit duration(sec): 3

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

Mechanical endurance: 1000 operations

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2000A/24kV disconnectors PDF 
disconnector

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:

Ambient temperature (oC): from -25 to +45

Altitude from sea level(m): 1000

Relative humidity: less than 95%

Ice coating (mm): max 10

Pollution level: moderate to heavy

Wind speed: 150km/h

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.

Type test certificate

 

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H.V. Disconnector PDF 
HV disconnector

  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

Installation: Outdoors

Ambient air temperature: max +45°C, min -24°C

Altitude: Up to 1000m above sea level

Relative humidity: <95%

Ice coating: max 20mm

Pollution level: moderated to heavy

Wind speed: 150km/h

Other conditions: Snow and fog

ELECTRICAL CHARACTERISTICS

Rated voltage: 420kV

Rated frequency: 50Hz

Rated nominal current: 3150A

Rated short time withstand current: 40kA rms

Rated peak withstand current: 100kVrms

Rated short circuit duration: 3sec

Rated power frequency voltage withstand levels: 620kV (phase to earth)/800kV(isolating dist)

Rated switching impulse voltage withstand levels: 900 (+450) kV (isol. dist), peak (dry) /1050kV peak (phase to earth)

Lightning impulse withstand voltage: 1550kV peak (phase to earth)/1550 (+315) kV peak (isol. dist.)

Mechanical endurance class: M1 (2000 operating cycles)

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