How to use power quality analyzer and its content

Continuous monitoring: Continuous monitoring of the power quality of the public power supply points of important substations, the primary skill guidelines for monitoring: power supply frequency, voltage error, three-phase voltage imbalance, negative sequence current, active power, grid harmonics, power factor . Control content: The power supply frequency control has been undertaken by the power dispatching center. Power quality control mainly refers to the announcement of alarm or control commands when the voltage error, three-phase voltage unbalance, and power grid harmonics exceed the limit. The continuous monitoring task is primarily terminated by a power quality monitor installed in the substation.

Punctual patrol detection: Firstly, it is suitable for testing methods that need to master the quality of power supply without continuous detection or continuous detection conditions. Power quality testing of public points in residential, commercial and small factory power supply systems. Depending on the degree of importance, it can be detected once a month or in the first quarter. The inspection task is mainly terminated by a portable power quality analyzer or a handheld harmonic analyzer.

The voltage is not firm and the flicker policy does not require continuous online monitoring. If the load is not changed within the power supply range, it is usually detected once every six months or one year. Measurements of voltage instability and flicker can be ended by a flicker or portable power quality analyzer.

Special detection: It is mainly applicable to the detection methods before and after the annoyance source device is connected to the grid (or capacity change), to determine the setting status of the grid power quality policy and the internship amount or the effect of the verification skill measure. This monitoring task is typically terminated by a portable power quality analyzer. At the end of power quality detection and monitoring, the choice of power quality monitoring points will be directly related to the detection and monitoring effects. For the setting of power quality monitoring points, the following elements should be considered: 1. The main network and all supply voltage levels should be covered and distributed evenly within the power grid (region and line); 2. Meet the power quality policy adjustment and control. Need; 3. Meet the needs of users with extra users and contracts with power quality policy terms. The specific settings of the detection points of various types of detection methods are different according to the characteristics of different power quality policies, and should be judged according to the relevant national standards and rules.

Electrolytic capacitor

The electrolyte material inside the electrolytic capacitor, which has charge storage, is divided into positive and negative polarity, similar to the battery, and cannot be connected backwards.A metal substrate having an oxide film attached to a positive electrode and a negative electrode connected to an electrolyte (solid and non-solid) through a metal plate.

Nonpolar (dual polarity) electrolytic capacitor adopts double oxide film structure, similar to the two polar electrolytic capacitor after two connected to the cathode, the two electrodes of two metal plates respectively (both with oxide film), two groups of oxide film as the electrolyte in the middle.Polar electrolytic capacitors usually play the role of power filter, decoupling (like u), signal coupling, time constant setting and dc isolation in power circuit, medium frequency and low frequency circuit.Non-polar electrolytic capacitors are usually used in audio frequency divider circuit, television S correction circuit and starting circuit of single-phase motor.

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