Intelligent integrated power distribution cabinet

Abstract

The invention relates to an intelligent monitoring integrated power distribution cabinet which is applied to a power distribution system. According to the intelligent integrated power distribution cabinet, a current measuring mutual inductor, a power distribution equipment working condition on-line detecting terminal, an intelligent reactive power compensation capacitor and a magnet-holding non-voltage contactor are mounted on a metal outer shell control box according to a specified low-voltage apparatus mounting wiring standard, a wireless communication module is matched with the power distribution equipment working condition on-line detecting terminal to be arranged, and the power distribution equipment working condition on-line detecting terminal comprises an electric energy measuring module, a single chip microcomputer module, a power parameter collecting module and a harmonic signal detecting module. The power distribution cabinet is connected with a mobile communication base station and a front end computer through a wireless module and an optical fiber module, and uploading and receiving of power parameter data, early warning information and monitoring orders are achieved. The problems that a traditional power distribution system is high in operation loss, low in automatic degree, not reliable in power supply, poor in power supply quality and the like in operation are solved, and a good basis is laid for achieving intelligent monitoring management of the power distribution system.

Description

technical field [0001] The invention relates to a power distribution cabinet, in particular to an intelligent monitoring integrated power distribution cabinet applied to a power distribution system. Background technique [0002] At present, in the vast power distribution system network in our country, because the power distribution equipment mostly adopts traditional power distribution equipment, the equipment technology is backward, and the damage rate is high, which directly affects the normal operation of the distribution transformer area. [0003] The current power distribution cabinet has the following problems in the actual operation process: [0004] 1. The degree of automation is low. Lack of monitoring, management background and corresponding communication equipment. Meter reading, power parameter detection, control, etc. are completely dependent on manual work, with low efficiency and poor benefits; [0005] 2. The power supply is unreliable. The traditional lo...

AI Technical Summary

Problems solved by technology

Meter reading, power parameter detection, control, etc. are completely dependent on manual work, with low efficiency and poor benefits;

[0005] 2. Unreliable power supply

Labor is time-consuming and affects normal power supply

[0006] 3. Poor quality of power supply

(1) The voltage qualification rate is low

Also because the traditional low-voltage power distribution cabinet lacks automatic online detection function, when the voltage of the distribution network is too low, the output voltage will decrease accordingly.

When the voltage is reduced to (10% of the rated voltage), the current increases accordingly, burning the motor of the electrical equipment, causing the line loss to increase; when the voltage of the distribution network is too high, the output voltage increases accordingly

When the voltage is too high (more than 10% of the rated voltage), the magnetic flux density of the iron core of the distribution transformer will increase, and the loss of the transformer will increase, causing resonance, resulting in harmonic splashing, and affecting the normal use of electrical equipment, such as incandescent lamps and household appliances. , in severe cases, it may cause electrical equipment to be burned

(2) Unbalanced three-phase active power

The unbalanced low-voltage three-phase load in the distribution transformer area is common, and the unbalanced current will reduce the output of the transformer. (3) The effect of reactive power compensation is poor

The commonly used reactive power compensation device only detects the line voltage and one-phase current, and the power factor is used as the switching basis, which is easy to cause over-compensation and under-compensation of the single-phase, and switching oscillation occurs at light load, which aggravates voltage instability. status, damage switching switches and other electrical equipment; there are few classifications, and it is not suitable to be grouped carefully

For example, 200KVA transformers are usually configured in three levels according to the compensation capacity of 60Kvar, and the capacity of a single capacitor is 20Kvar, which cannot compensate for reactive loads below 20Kvar. This alone will cause an extra power loss of 315,000 kWh during the 20-year life of the transformer.

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