Materials required for power quality assessment
At present, power supply companies have more and more stringent requirements on power quality. The power consumption audit for enterprise expansion or new project construction is no longer just about whether the power system capacity and power facility configuration are scientific and reasonable. The impact of the power system puts forward further assessment requirements. In order to help enterprises to successfully pass the application for new projects, the Power Quality Division of Zhejiang Hongyan Electric Co., Ltd. provides power quality assessment and analysis services for new projects, including large-scale rail transit lines, Conduct power quality assessment and analysis on rail transit stations, steel mill electric furnace projects, large-scale enterprise production bases, park power distribution pre-planning, commercial building buildings, etc., so that the power quality problems can be scientifically managed in the early stage of the project instead of waiting until the power quality After the problem is highlighted and has a great impact, remedial measures are taken.
The evaluation of power quality includes the evaluation of power quality indicators such as harmonics, voltage fluctuations and flicker, power factor, and three-phase unbalance by simulating, analyzing, and calculating the impact of power loads in the user’s power system on the system’s common connection points. , The evaluation report can be issued within 10 working days if the materials are complete.
Power Quality Assessment Scheme Service Flowchart
Evaluation content:
Simulate, analyze, and calculate the impact of the power load in the user’s power system on the system’s common connection points, including power quality indicators such as harmonics, voltage fluctuations and flicker, power factor, and three-phase unbalance.
Power Quality Assessment Basis
Relevant standards of our company
The evaluation basis for power quality in the analysis and calculation process will adopt the unified power quality related standards of our company and the power industry, including:
“Power Quality-Allowable Unbalance of Three-phase Voltage” (GB/T15543-2008)
“Power Quality – Voltage Fluctuation and Flicker” (GB12326-2008)
“Power Quality-Public Grid Harmonics” (GB/T14549-93)
Assessment Catalog (Reference)
one. User Electricity Application Overview
two. Power Quality Assessment Basis
2.1 Related to our company standards 2
2.2 Explanation of relevant standards of our company
three. Contents of power quality assessment
Four. User’s power supply method
4.1 External power supply mode
4.2 Internal power supply mode
five. Basic data for power quality assessment
5.1 Basic data of new load power quality
six. Distribution of Power Quality Limits to Loads
6.1 Harmonic voltage and harmonic current
6.2 Voltage fluctuations and flicker
6.3 Three-phase voltage unbalance
seven. New load power quality pollution level calculation
7.1 Harmonic current
7.2 Voltage fluctuation and flicker
7.3 Three-phase voltage unbalance
eight. Evaluation conclusion
8.1. Evaluation of limit violations after loads are connected to the grid
8.2 Recommended supporting measures after the load is connected to the grid
8.2.1 Capacity Determination
8.2.2 Filter branch configuration
8.2.3 Simulation analysis of power quality after installing filter compensation device
Nine. Reference attachment: Harmonic test report
Materials to be provided by users (materials to be provided for power system power quality assessment of new projects)
The entrusting party must provide the following information and affix the official seal
1. The power consumption plan, feasibility study report, and design drawings (including the primary diagram of the power system) designed by the Electric Power Design Institute approved by the Power Supply Bureau
2. The public access point system voltage, system short-circuit capacity, system protocol capacity, and system power supply capacity approved by the power supply bureau
3. Transformer technical parameters (capacity, voltage ratio, wiring method, impedance voltage)
4. List of all load parameters (listed separately according to the load carried by each transformer)
Including load name, quantity, rated power, voltage;
In particular, the following non-linear load equipment should be specially noted:
For nonlinear loads, such as various uninterruptible power supplies (computer UPS, etc.), gas discharge lamps (energy-saving lamps, fluorescent lamps, high-pressure mercury lamps, high-pressure sodium lamps and metal halide lamps, etc.), office equipment (copiers, fax machines, etc.), Household appliances (display screens, microwave ovens, televisions, video recorders, computers, dimming lamps, temperature-regulating cookers, air conditioners, etc.), electronic rectification equipment (thyristor rectification equipment, including electric locomotives, aluminum electrolytic cells, charging devices, switching power supplies, etc. Rectifier equipment), welding equipment, frequency conversion equipment (commonly used in fans, water pumps, elevators, air conditioners), rolling mills, electric arc furnaces, calcium carbide furnaces, intermediate frequency furnaces, electroplating equipment, etc. The 25th harmonic voltage and harmonic current distortion size statement or report shall be affixed with the official seal of the production unit.
5. Evaluation criteria: (please select several or all, this item is the first item)
(1) Power quality Public grid harmonics GB/T14519-1993
(2) Power quality Voltage fluctuation and flicker GB12326-2000
(3) Power quality Allowable deviation of power supply voltage GB12325-1990
(4) Electric energy quality Three-phase voltage allowable unbalance GB/T 14543-1995
6. Name of entrusting unit, technical contact method, telephone number, fax, etc.
7. Project overview (project feasibility study report)
Post time: Apr-13-2023