First, insulation accident
The main reason for the insulation accident: on the one hand, the tooling process is not in place during the installation, commissioning and overhaul of the high voltage circuit breaker. On the other hand, the design and manufacture quality of the insulation of the high-voltage circuit breaker does not meet the requirements of the technical standards, and the pull rod is pulled off, so that the moving part is not in operation. Therefore, strict high-voltage circuit breaker tooling process, purchased parts inspection, assembly environment cleanliness and necessary testing methods are the main measures to prevent insulation accidents. Must be highly valued by the design, manufacturing and application departments.
Second, breaking and closing accidents
The breaking and closing accident is caused by the short circuit of the oil circuit breaker during the breaking process, the burning of the arc extinguishing chamber is serious, the breaking capacity of the circuit breaker is insufficient, and the acceleration is low after closing the speed. Therefore, in the process of installation, overhaul and debugging of high-voltage circuit breakers, attention is paid to the exhaust direction of the oil circuit breaker, the grinding of the static and dynamic contacts, the removal of foreign objects in the arc extinguishing chamber, the verification and selection of the breaking capacity of the circuit breaker, and the speed characteristics of the combined circuit. Adjustments, etc., to curb the occurrence of breaking and closing accidents, do not neglect the general.
Third, refused or misled accidents
The refusal and misoperation accidents refer to the tampering of the high-voltage circuit breaker when it refuses to distinguish, refuses to cooperate, and does not act. Among them, the refusal accidents accounted for more than 50% of the same type of accidents and were the main accidents. The main reason for the analysis was due to the quality of the manufacturing and improper installation, commissioning and overhaul, and poor secondary line contact. Therefore, the use department should be organically combined with the manufacturing department to make the design, material selection, necessary spare parts, process requirements, debugging requirements, etc. of the high-voltage circuit breaker as reasonable and practical as possible, and the human behavior may be negligent. The accident is limited first, so as to prevent it from happening.
Fourth, interception accident
Most of the main causes of interception accidents are caused by poor contact between moving and static contacts. The main reason is that the contact between the static and dynamic contacts or the isolation plug is poor, and the heat is overheated under the long-term action of large current, so that the contacts are burnt, burned and loose. Fall off and so on. Therefore, the material selection and heat treatment of the contact spring of the high-voltage circuit breaker and the adjustment of the contact pressure are important technical measures to prevent the occurrence of the interception accident.
5. External forces and other accidents
External forces and other accidents mainly refer to oil leakage, air leakage, component damage, frequent pressure suppression, irresistible natural disasters, and small animal short circuits. The main reason is that the sealing ring is easy to aging and damage, the pipeline and valve body are poorly cleaned, and the joint manufacturing and assembly quality are poor. Such problems have been a difficult problem for the reliable operation of domestic high-voltage circuit breakers for many years.
Sixth, the vacuum circuit breaker accident
High-voltage vacuum circuit breakers are generally recognized by the use department for their superior breaking performance and long cycle life.
With the wide application of high-voltage vacuum circuit breakers, the improved new generation of vacuum circuit breakers generally use longitudinal magnetic field electrodes and copper-chromium contact materials, which reduces the arc voltage under short-circuit breaking current and reduces the amount of contact burnout until active. However, due to the air leakage of the arc chamber and the bellows, the opening and closing accident caused by the decrease in the vacuum degree is on the rise and cannot be ignored. In addition, there are still re-ignition and ceramic vacuum tube ruptures in the capacitor capacitor group. At the same time, the current vacuum circuit breakers are complicated in type, many manufacturers, and the product quality is highly dispersible, which makes the equipment selection and operation of the use department difficult.
Seven, SF6 high voltage circuit breaker accident
SF6 high voltage circuit breaker is widely used in various voltage level breaking devices of power systems with good insulation performance and superior arc extinguishing medium. Common problems in domestic SF6 high-voltage circuit breakers are: air leakage, excessive moisture, arc chamber explosion, insulation rod drop, breakage, breakdown, horizontal tie rod break and so on. When the tie rod is detached, a major accident must occur, and it must be taken seriously; the foreign matter in the arc extinguishing chamber inside the tank or the falling off of the parts and components will cause a severe breakdown and flashing inside the high-voltage circuit breaker. Therefore, efforts to improve the cleanliness of the SF6 high-voltage circuit breaker assembly environment and strict process control are essential to ensure the safe operation of the equipment.
Electric Curtains And Curtain Motor
Person can control the curtains open or close with switch.
Electric curtain machine consists of three parts:
1. Intelligent control system for controlling the opening and closing of curtains.
2. Operate and set the main controller of the wireless controller. (electric curtain)
3.Pulling the curtain actuator motor and pulling mechanism. The host machine controls the positive and reverse rotation of the motor, and the curtain is automatically closed or opened by a pulley.
It can make the infrared remote control the curtain open or close the directly,setting up the main controller automatic function with remote control, once set up and open the automatic control function, the main controller will automatically control function according to it.
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