12kV-5000A/63kA armored fixation type double-bus cabinet

Abstract

A 12kV-5000A / 63kA armored fixation type double-bus cabinet overcomes the defects that in the prior art, the cut-off current is small, the precision is low, the pressure relief and heat dissipation effects are poor, the electromagnetic resonance is large and operation is laborsome. The 12kV-5000A / 63kA armored fixation type double-bus cabinet is characterized in that a cabinet body is of a full packaging structure, a work main bus chamber and a standby bus chamber are arranged front and back, an instrument chamber and a small bus chamber are arranged in the middle of the front of the cabinet body, a pressure relief device is installed on the top of the bus chambers and an isolation chamber, black paint is sprayed onto the interior of the main bus chamber and main and branch buses except the lap joint portion, a stainless steel plate is adopted as a partition plate in the bus passing position, an armor clamp is installed on an insulator, a spacer pad is added when the supporting span of the main bus is large, an isolating switch is connected with an electric operating mechanism, and a manual interlocking mechanism is installed at the front end of the electric operating mechanism. The 12kV-5000A / 63kA armored fixation type double-bus cabinet has the advantages that the cut-off current can reach 63kA, the precision is high, the heat dissipation effect is good, temperature rise and energy consumption can be reduced, the electromagnetic resonance is small, the dynamic stability of the buses is smooth and steady, the cabinet can be operated both electrically and manually and is safe and reliable in operation, the buses can be maintained without cutting off the power.

Description

technical field [0001] The invention belongs to electric equipment, in particular to a 12kV-5000A / 63kA armored fixed double busbar cabinet. Background technique [0002] In the existing technology, the medium-voltage high-current double-busbar switchgear can reach the rated current of 4000A and the rated breaking current of 50kA. With the development of the city, the power consumption has increased rapidly, and the existing products can no longer fully meet the demand for power growth. Therefore, the development of armored fixed double-busbar cabinets with a rated current of 5000A and a rated breaking current of 63kA is a way to solve the current contradictions in petrochemical, metallurgical, and power plants. In the prior art, the rated current is small and the short-circuit breaking capacity is low; the cabinet adopts a welded structure with low precision and large errors; the working bus room and the spare bus room are arranged in the middle of the cabinet, so the pressu...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, the medium-voltage high-current double-busbar switchgear can reach the rated current of 4000A and the rated breaking current of 50kA. With the development of the city, the power consumption has increased rapidly, and the existing products can no longer fully meet the demand for power growth. Therefore, the development of armored fixed double-busbar cabinets with a rated current of 5000A and a rated breaking current of 63kA is a way to solve the current contradictions in power consumption in petrochemical, metallurgical, and power plants.

In the prior art, the rated current is small and the short-circuit breaking capacity is low; the cabinet adopts a welded structure with low precision and large errors; the working bus room and the spare bus room are arranged in the middle of the cabinet, so the pressure relief device of the switch room can only be located The top of the front and back of the cabinet is easy to cause injury to the maintenance personnel in case of failure, which is not conducive to the heat dissipation and pressure relief of the switch room; the working current will generate electromagnetic resonance under the action of the electric field force, especially in the case of large current and short circuit It is especially serious in the case of current, the greater the passing current, the higher the heat generated by the busbar, the greater the electromotive force, the greater the eddy current at the passage of the busbar, the higher the temperature of the busbar room, and the more losses; how to solve the problem under the full operating conditions? Heat dissipation, reducing temperature rise, reducing electromagnetic resonance and reducing energy consumption are the top priorities in the design of high-current cabinets; in the prior art, each phase contact of the disconnector is a single group and the upper and lower contact surfaces are arranged horizontally. With the removable type, the temperature of the isolating switch and the moving and static contacts of the circuit breaker rises when the power is turned on, the ability to withstand dynamic and thermal stability is low, and the energy consumption is large; the existing technology uses manual operation of the isolating switch, and the operating force of the high-current and high-voltage isolating switch is More than 350N.m, there are defects such as large operating force, insufficient separation and inability to control remotely; when the isolation switch is manually operated, the separation and closing are prone to failure, resulting in poor contact between the dynamic and static contacts of the isolation switch. There is a hidden danger of burning out the high-voltage switchgear and being unable to withstand the electromotive force generated by the short-circuit current. At the same time, the manual operation of the isolating switch also has the problem of opening with load and causing major accidents.

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