EM200000 for protection cubicle with circuit breaker type DF-D width 500 mm – Un 17,5 kV

Earthing knife for earthing of a cable connection on the lower contacts of a RV 44 load break switch in a protection cubicle with circuit breaker type DF-D width 500 mm, at Un 17,5 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
. – the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

EM241000 for incoming cubicle type DF-A – Un 24 kV

Earthing knife for earthing of a cable connected to the lower contacts of a RV 44 load break switch in an incoming cubicle type DF-A at Un 24 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
– the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– Together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

EM241001 for incoming cubicle DF-A – Un 24 kV

Earthing knife for earthing of a double cable connection on the lower contacts of a RV 44 load break switch in an incoming cubicle type DF-A at Un 24 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
– the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

EM242000 for fused protection cubicle DF-P – Un 24 kV

Earthing knife for earthing of a cable connection on the lower contacts of a RV 44 load break switch in a fused protection cubicle type DF-P, at Un 24 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
– the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

EM300000 for busbar on top of DF-A – Un 17,5 kV

Earthing knife for earthing of a busbar on top of an incoming cubicle type DF-A at Un 17,5 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched-on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
– the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

Short earthing knife for earthing knife on bar set A-cell (for earthing switch on cubicle)

Earthing knife suitable for earthing a barstel on top of an arrival cell type DF-A at Un 17.5 kV.

The earthing devices are designed and tested according to IEC 62271-102 subclause 6.101 (making).

Function

– the earthing knife is the moving part of the earthing switch in a medium voltage cell.
– the earthing knife makes it possible to connect the 3 phases (short circuit)
– an activated earthing switch connects disconnected parts to earth, so that work on the cell can be carried out safely.

Structure

– 3-phase implementation
– each phase is equipped with 2 earth knife spoons with silver plated copper contacts
– the ground knife spoons are mounted on support arms, with stainless steel springs securing the contact pressure force
– each support arm is permanently welded to the central axis of the earth blade
– the central shaft is equipped with gripping points for actuation by a switching mechanism
– the earthing knife is equipped with a connection point for earthing braid (not included) for connection to earth

Operation

– The earthing knife together with fixed contacts forms a 2-position earthing switch.
– when closing, the earth ladles make the connection with earth cubes on fixed contacts.
– the earthing knife opens (no earthing) or closes (visible earthing), the circuit is made in air.
– the contacts short-circuited are connected to the earth via the earthing braid (not included).

EM301000 for busbar on top of DF-A – Un 24 kV

Earthing knife for earthing of a busbar on top of an incoming cubicle type DF-A at Un 24 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
– the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

EM-50 is an auxiliary earthing knife for an RMU.

The auxiliary knife is an additional grounding knife, which will ground any residual voltage if one or more fuses in the fuse housing are melted.

This auxiliary blade has some delay on the main blade, so the short circuit resistance of 50 kA is guaranteed by the RV 50.

The auxiliary knife has only a limited inrush capacity of 2 kA.

Phase distance of the auxiliary knife is 90 mm.

EM981000 for incoming cubicle DF-A, or fused protection cubic DF-P, or protection cubicle with circuit breaker DF-D – Un 17,5 kV

Earthing knife for earthing of a cable connected to the lower contacts of a RV 44 load break switch in an incoming cubicle type DF-A, or in a fused protection cubic type DF-P, or protection cubicle with circuit breaker type DF-D, at Un 17,5 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
– the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

EM981001 for incoming cubicle DF-A, or protection cubicle with circuit breaker DF-D/EDN – Un 17,5 kV

Earthing knife for earthing of a double cable connection on the lower contacts of a RV 44 load break switch in an incoming cubicle type DF-A, or protection cubicle with circuit breaker type DF-D/EDN, at Un 17,5 kV.
Designed and tested according IEC 62271-102 subclause 6.101 (making).

Function
– the earthing knife is the moving part of the earthing switch in a medium voltage cubicle
– the earthing knife allows to short circuit the 3 phases
– a switched on earthing switch connects freed parts with the earth, to allow for secure working in the cubicle

Construction
– 3-phase execution
– each phase has 2 earthing knife spoons with silver plated cupper contacts
– the earthing knife spoons are mounted on supports, with stainless steel springs assuring contact pressure
– each support is welded onto the central axis of the earthing knife
– the central axis has coupling points for the driving part of a mechanism
– the earthing knife offers a connection point for earthing braid (not included) to connect with earth

Functioning
– Together with fixed contacts the earthing knife makes up a 2-position earthing switch
– at closing the earthing knife spoons make the connection to the fixed contacts
– the earthing knife opens (loss of earth connection) of closes (visible earth connection), the switching operation is in air
– the short-circuited contacts are connected to earth via the earthing braid (not included)

Earthing switch for SV-25 A