Description of KRU "INVEL"
Complete switchgears KRU "INVEL" for a rated voltage of 6 (10) kV are designed to operate in the distribution of three-phase AC 50 Hz with isolated or grounded neutral. Cells 6 (10) kV KRU "INVEL" up to 4000A are used in areas with a moderate climate under normal conditions. Climatic execution and category of accommodation - У3.1 (У3 - execution by special order) according to GOST 15150.
Advantages of KRU "INVEL":
- In the basic version, a modern and reliable switch VV "INVEL" is used;
- Modular principle of construction of cells "INVEL" 6 (10) kV with division into compartments. The modules are connected by means of bolted plug-in connections, after which necessary connections of the main and secondary electrical circuits are made;
- MBRZ is used by any manufacturer at the request of the customer;
- All types of electrical and technological protection are being implemented;
- Operational safety;
- Possibility of automated process control system and automated metering system;
- Possibility of both two-way and one-way services;
- The case of complete switchgears KRU "INVEL" is made of galvanized sheet steel by riveting and without welded joints, which ensures that there are no foci of corrosion and the need for painting.
Cells 6 (10) kV KRU "INVEL" comply with the requirements of GOST 14693-90 and TU 3414-015-82324057-2011, which is confirmed by the certificate of conformity РОСС RU.МВ03.Н00661
Due to their compact size, the 6 (10) kV cabinets of KRU "INVEL" often used wherever space saving (urban substations, power plants, industrial facilities) is important.
In the design of complete switchgears KRU "INVEL" uses a modular principle of formation, where each module has its own separate housing. The modules are connected by means of bolted plug connections, after which the necessary connections of the main and secondary electrical circuits are made.
The main circuit module is divided into two compartments: the busbar compartment and the cable connection compartment. Each of the compartments has a separate valve to relieve pressure. A panel with current transformers is mounted on the back of the housing. Rear closure - removable, consists of two sheets - the top and bottom. At the base of the compartment, a rectangular "window" was cut to insert the cables inside the cell. Depending on the number of cables to be connected, the "window" can overlap as with sheets cut-outs for cables, and sheets deaf or with ventilation cuttings. Along the side walls on the base are fixed two channel-shaped profiles with evenly cut rectangular holes for the installation of rails with clamps and brackets with zero-sequence current transformers.
The cable connection module is a continuation to the front side of the cable connection compartment of the main circuit module module. The lower part has a construction similar to the module of the main circuits. At the top of the module there are holes for installing panels with supporting insulators and arresters. On the front side, the module has a door that is similar in design to the door of the withdrawable unit module.
The module of low-voltage equipment is a separate box with a door on the front side, in which all low-voltage equipment of KRU "INVAL" is concentrated. Installed at the top of the complete switchgear.
The valve insert for the withdrawable element module serves to create favorable conditions for the convective cooling of the module and the release of arc combustion products in the event of a short circuit.
The trolley of withdrawable element KRU "INVEL" has dimensions in width - from 600 mm to 1000 mm. The moving mechanism of the carriage has a movable part on which a power switch or other device is mounted and a fixed part fixed by means of mechanical latches to the front side of the withdrawable unit housing. The stationary part serves as the base, relative to which the trolley moves, and has a socket for inserting a special handle, the rotation of which moves. The transformation of the rotational motion of the handle into the translational motion of the trolley is carried out by means of a screw rod with a multi-threaded rectangular thread.
The rolling mechanism is an important element of the safety of maintenance of KRU "INVEL". It serves to cover the internal cavities of bushing insulators with current-carrying rods while moving the withdrawable element to the control (inoperative) position. Curtains are metal sheet structures, moving in a vertical direction under the influence of a system of levers. Levers, in turn, are set in motion by a trolley, which, when moving, causes them to set the curtains to the desired position.