Switchgear 10 kV VM-1

Middle-voltage complete switchgear KRU VM-1, designed to receive and distribute electric power of three-phase alternating current with industrial frequency of 50 and 60 Hz and voltage of 6, 10 kV, is used in systems with rated current up to 3150A. The switchgear is used to ensure the operation of switchgear of various substations, including network and industrial facilities, as well as block complete transformer substations and auxiliary systems of power plants.
Switchgear VM-1 is a modular design consisting of individual modules in which various apparatuses, measuring devices, relay protection, control, automation and signalling devices are integrated.
The unit of switchgear is divided into four compartments:
- cable compartment;
- switchgear compartment;
- busbar compartment;
- relay compartment.
The switchgear VM-1 is designed for two-way maintenance:
- access from the rear side is required for repair and adjustment work;
- all operations are performed from the front of the cabinet.
The layout of switchgear provides the convenience of inspection, repair and dismantling of the main equipment during operation of the complete switchgear without disconnecting the voltage on the busbars and neighbouring connections.
Busbar compartment: The busbars of switchgear VM-1 are located in the upper compartment of the cubicles. The compartment is completely isolated from the other high voltage compartments. The busbars can be made of copper or aluminium and have a rectangular cross-section. The busbars are separated by insulating partitions. Access to the busbars is via the quick-release rear top panel of the cell.
Relay compartment: The relay box, which is a prefabricated structure, is mounted above the switchgear compartment. Control, signalling and measuring instruments are located on the door of the relay cabinet. The control cables to the switchgear can be fed from above through openings in the top of the relay box with the control cables passing through cable trays mounted on the panels of the relay box and exiting through suspended cable trays to other switchgear sections or freestanding equipment.
Cable compartment: The cable compartment contains current transformers, quick earthing disconnector, zero sequence current transformers, surge arresters and supporting insulators. The transformers are mounted on plates and suspended with the primary leads downwards in the centre of the enclosure. The primary leads are easily accessed via a quick-release cable compartment panel located at the rear of the cabinet. The earthing switch is a complete assembly mounted in the front of the cable compartment. The position of the earthing switch blades can be viewed through the viewing window at the rear of the enclosure. The earthing switch has a spring-loaded mechanism for fast action.
The withdrawable element compartment: The withdrawable element consists of a carriage with high-voltage equipment (circuit breaker, voltage transformer, disconnecting contacts) and its drive. The withdrawable element has wheels and can be moved smoothly and easily from the fixed position to the repair position (outside the enclosure) and back. To remove the withdrawable element for repair, an inventory trolley is used, which is included in the set of spare parts, tools and accessories supplied with the order. Safe work in the switchgear compartment is ensured by protective shutters, which automatically close when the withdrawable element is rolled out to the control position and block access to fixed live contacts. The design of the curtain mechanism prevents spontaneous opening of the curtains when the withdrawable element is in the repair position. To ensure safe operation during repair, the shutters can be locked in the closed position with padlocks.
The door of the withdrawable element compartment is equipped with a number of locking devices to ensure localisation resistance of the enclosure. The front door has a viewing window for monitoring the position of the withdrawable element, a socket for the mechanical drive of the withdrawable element, buttons for emergency switching on and off of the switch, and a sequence diagram for safe opening of the compartment door.

Technical data