Product Introduction

KYN550-12 indoor armored removable AC metal-enclosed switchgear (hereinafter referred to as KYN550-12 switchgear) is a complete set of power distribution equipment with smaller size, which is applied to 12kV three-phase AC 50Hz single bus and single bus section system. KYN550-12 has the "five prevention" interlocking function of preventing the loaded push-pull circuit breaker handcart, preventing the false opening and closing of the circuit breaker, preventing the closing of the circuit breaker when the grounding switch is in the closed position, preventing the inadvertent entry into the electrified compartment, and preventing the false closing of the grounding switch when it is electrified. It is equipped with the indoor medium-voltage solid-sealed vacuum circuit breaker handcart of public electrical, which is a kind of distribution equipment with excellent performance. The required substation.

The size design of KYN550-12 saves a lot of power distribution space for customers. It is mainly used for commercial and industrial buildings, real estate, data centers and other industrial power grids

standard

The switchgear meets the requirements of IEC62271-200, GB3906, DL/T404 and other standards. The protection grade of KYN550-12 switch cabinet shell is IP4X. When the circuit breaker room door is opened and the handcart is removed, the protection grade is IP2X.

Working conditions

● Ambient air temperature: upper limit+40 ℃, lower limit - 25 ℃;

● Altitude: the upper altitude of the equipment installation site is 2000m;

● Ambient temperature: daily average relative humidity is not more than 95% and monthly average relative humidity is not more than 90%;

● The seismic intensity shall not exceed 8 degrees;

● The surrounding air shall not be obviously polluted by corrosive or combustible gases, water vapor, etc;

● No serious pollution and frequent violent vibration. The severity design under severe conditions shall meet Class 1 requirements.

● When it is used under normal environmental conditions that exceed the provisions of GB3906 and these technical conditions, the user and the manufacturer shall negotiate.

Cabinet introduction

The switchgear is designed according to the standard of armored metal-enclosed switchgear in GB3906 and IEC62271-200. The whole is composed of two parts: cabinet body and central withdrawable parts (i.e. handcart). The cabinet body is divided into four separate compartments, with overhead incoming and outgoing lines, cable outgoing lines and other functional schemes. After arrangement and combination, it can become a power distribution device to meet the needs of users. In addition to meeting the user habit of maintenance behind the cabinet in China, the switchgear also provides the option of maintenance before the cabinet. The design of maintenance in front of the cabinet can be installed, debugged and maintained from the front. Therefore, when it is used as a single bus section system, it can be installed back to back or face to face. In addition to double arrangement, it can also be installed against the wall, further reducing the floor area. It improves the practicability, adaptability and flexibility of the switchgear, reduces the investment cost on the premise of meeting the safety performance, and has a high cost performance.

Shell and others

The shell of the switchgear is made of aluminum-zinc coated steel plate with strong corrosion resistance, which is processed and bent by CNC machine tool. The special design of the side plate can not only form a 5mm air layer between the two adjacent cabinets when the cabinets are spliced, but also reduce the impact of arc faults between cabinets; And the rigidity is strong. The cabinet body adopts an assembled structure, which is connected by rivet nuts, high-strength bolts and blind rivets. There is no need to open a hole between the cabinets, which makes the installation simple and beautiful, and improves the production efficiency. The instrument room is an independent unit, which is separated from the high-voltage area of the switchgear and has the functions of shockproof and fireproof. When the breaker handcart is moved away, the valve closes automatically, and the switchgear still maintains the protection level of IP2X. The door plate and terminal side sealing plate of the switch cabinet are made of cold-rolled steel plates, which are treated with purification and anti-corrosion treatment, and are sprayed with plastic to make their surface impact resistant and corrosion resistant, and ensure the appearance of beauty.

Handcart

The handcart frame is made of thin steel plate processed by CNC machine tool and assembled. The handcart is insulated with the cabinet, and the mechanism interlocking is safe, reliable and flexible. According to the purpose, handcart can be divided into circuit breaker handcart, voltage transformer handcart, metering handcart, isolation handcart, etc. All kinds of handcart can be changed according to module and building block, and handcart of the same specification can be freely exchanged. The handcart has a disconnection position, a test position and a working position in the cabinet. Each position is equipped with a positioning device to ensure the reliability of the interlocking. It must be operated according to the interlocking anti-misoperation procedure. All handcart uses nuts and screw rods to move forward and exit. Its operation is light and flexible, and is suitable for the operation of the personnel on duty. When the handcart needs to be removed from the cabinet, a special transfer vehicle can be used to easily pull it out for various inspections and maintenance. In addition, the central type is adopted. The whole handcart is small in size and convenient for inspection and maintenance. The signal, protection and control secondary wires between the switchgear and the circuit breaker handcart are connected through multi-pin aviation plugs.

Enclosed circuit breaker

The solid-sealed circuit breaker used by KYN550-12 has good insulation, moisture-proof, anti-condensation and other properties. The sealed vacuum circuit breaker embeds the vacuum interrupter and the conductive parts related to the circuit breaker into the solid insulation materials such as epoxy resin which are easy to solidify to form a pole, making the entire circuit breaker pole a whole component, making the removable parts less and more reliable, and changing the surface insulation into volume insulation, which reduces the impact of the environment and greatly improves the insulation strength compared with air insulation. It reduces the size of the circuit breaker and is conducive to the miniaturization of the switch cabinet.

Working principle of circuit breaker handcart

When the handcart is transported into the cabinet circuit breaker room with a transfer vehicle, it can be reliably locked in the test position; The cabinet position indicator shows its position. And only after the safety lock, can the propulsion mechanism be shaken to push the handcart to the working position. After the handcart reaches the working position, the push handle will not move, and its corresponding position indicator will show its position. The mechanical interlocking of the handcart can reliably ensure that the circuit breaker can be closed only when the handcart is in the working position or test position; Moreover, the circuit breaker can only move when the handcart is in the open state. Close the door.