Hefei Lingjiang Automobile factory power distribution quality solution

2023-10-30

1. Industry overview

Hefei Lingjiang Automobile Welding Co., Ltd. is located in Lingdatang Industrial Zone, the business scope includes auto parts production; Automotive assembly welding, assembly, spraying, processing, maintenance, sales; Research and development, promotion and application of new products, new technologies and new processes for welding, assembly, spraying and processing of auto parts and assemblies. Production requires the use of a variety of large machinery and equipment, the power distribution requirements are particularly high. The load particularity of the automobile welding workshop will have a great impact on the power grid and related equipment. If the power distribution system cannot be properly designed. There will be serious problems such as low transformer load rate, large impact on the power grid, affecting the work of other equipment, and incorrect switching of compensation.

2. There are problems

There are mainly the following problems in the power supply system of automobile welding manufacturing:

1) Generate a large number of harmonic currents with relatively complex reactive power, and there are high order harmonics.

2) The existence of harmonics leads to power electronic devices with high power quality requirements in the automation program, and a large number of power electronic devices, switching power supplies, air conditioning facilities, frequency converters, welding machines, stamping machines, etc., are used in the production and manufacturing process. These loads are typical harmonic sources, which will cause device burn or no action or misaction, directly affecting the quality of the power grid.

3) Capacitor cabinet capacitance reduction, bulge in the cabinet, can not be used normally.

4) The welding machine load current fluctuates greatly, and the fluctuation speed is fast.

3. Cause harm

1) Voltage: The voltage fluctuation range becomes larger, the voltage is unstable, and the voltage distortion is large;

2) Harmonics: harmonic superposition, increase the harmonic content, reduce the safety of the system;

3) Current: current distortion increases, system and equipment loss increases, heat increases, and cable aging accelerates;

4) The response speed of the traditional compensation device can not keep up, and the low power factor affects the power quality;

4. Solutions

Add thyristor switching type ZPTSC low voltage dynamic reactive power compensation device, the device can automatically track according to load changes, real-time compensation, the system power factor is always maintained at the best point, while using modular series, can be freely combined. The isobaric input and zero crossing of thyristor switch can effectively restrain the switching surge, improve the stability of the system and prolong the service life of the capacitor. A reactor with branch series reactance of 7% can limit the closing inrush current and suppress specific harmonic frequency. PU soft resin aluminum shell capacitor. To create a green power supply system.

Power Quality series -ZPAPF parallel active power filter device. ZPSVG static reactive power generator. ZP-PQI intelligent hybrid filter compensation device, ZP-STB intelligent voltage regulator and power saving device ZPTBB, ZPFC high voltage reactive power compensation device;

Power distribution energy saving series --ZPGQ motor intelligent solid state soft start device. ZP-BQ integrated machine series inverter, electric complete sets;

Voltage regulator, voltage regulator series --SBW automatic compensation type power regulator, SBW-H three-phase high-precision automatic AC regulator, ZP-UPS uninterruptible power supply;

Component products --ZP-CE low voltage capacitor, ZP-LE low voltage series reactor, ZP-T thyristor switch, ZP-ZC intelligent power capacitor;

Power construction series - electrical, distribution equipment upgrading, online testing, installation, technical services.