Intelligent internet-of-things high-explosive switch

Abstract

An intelligent Internet of Things high-explosive switch comprises an explosion-proof shell arranged on a base, a front cavity and a rear cavity are arranged in the explosion-proof shell, primary equipment, a protector and a circuit breaker are arranged in the front cavity, the protector is connected with the primary equipment and the circuit breaker, the rear cavity comprises a wiring cavity and a grounding knife-switch cavity, and the wiring cavity is connected with the grounding knife-switch cavity. A cable connector is arranged in the wiring cavity, a grounding knife is arranged in the grounding knife cavity, and the intelligent power distribution cabinet further comprises an Internet of Things communication management machine, a thermal imager, a temperature and humidity sensor, a heating and dehumidifying device and a plurality of temperature measurement sensors arranged on contacts of the circuit breaker and the cable connector respectively. According to the invention, on-line diagnosis can be carried out on the breaking capacity of the circuit breaker, intelligent dehumidification can be carried out, fault diagnosis can be carried out based on the contact condition of each contact of the circuit breaker and a cable joint, fault elimination is facilitated, and the safety is high.

Description

technical field [0001] The invention belongs to the technical field of coal mine power grids, and in particular relates to an intelligent Internet of Things high-explosion switch. Background technique [0002] At present, mine explosion-proof and intrinsically safe high-voltage vacuum power distribution device (hereinafter referred to as high-explosion switch) is an indispensable switchgear for underground power supply in coal mines. It usually has primary equipment (voltage transformer (PT), current transformer (CT) ), zero-sequence current transformer), protector and circuit breaker, circuit breaker includes closing circuit, closing actuator, opening circuit, opening actuator, no pressure release tripping circuit, tripping actuator, circuit breaker Small car and so on. The high-explosive switch is used to realize power failure and power transmission to the power supply equipment; once a fault such as leakage or short circuit occurs on the load side of the electrical equip...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional high-explosive switch cannot carry out intelligent analysis and diagnosis, and cannot predict and give early warning of hidden troubles in advance, which is not conducive to troubleshooting:

[0004] 1. It is impossible to perform online diagnosis on the breaking capacity of the circuit breaker: for a high-explosive switch, once the breaking capacity of the switch is reduced or the mechanism refuses to move, when a short-circuit fault occurs, the switch itself is slow to remove the fault or cannot remove the fault, which will inevitably lead to the superior or The upper-level switch trips, and the situation of leapfrog tripping occurs. At present, it can only be monitored offline through external detection equipment. The simulated voltage and current in the offline state are normal, which is quite different from the real fault situation;

[0005] 2. It is impossible to carry out intelligent dehumidification of the interior: the interior of the high-explosive switch is closed. When the humidity exceeds a certain level, it may cause the surface of the solid insulation to continuously absorb moisture and form a water film, and the ions contained in the water will move along the surface of the insulation in the electric field. movement, and form accumulation near the electrode, which increases the local electric field intensity, discharges, and causes the flashover voltage to drop along the surface. The more serious the moisture absorption, the more the flashover voltage decreases along the surface. This discharge along the surface of the insulator will make The surface of the insulator is partially overheated to carbonization, accompanied by strong discharge sound and arc odor, which will eventually cause phase-to-ground and phase-to-phase short-circuit faults, resulting in major electrical accidents

[0006] 3. It is impossible to diagnose faults based on the contact conditions of the contacts of the circuit breaker and the cable joints:

[0007] When the trolley of the circuit breaker is not in place, the contacts of the contacts are unreliable, or the joints of the high-voltage cables are not fixed and reliable, there will be a certain impedance, and long-term work will cause the temperature of the contacts and cable heads to rise sharply, resulting in the movement of the moving contacts and static contacts. Discharge occurs at the cable joint, causing arc discharge short circuit or arc grounding, causing faults, accidents and power outages

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