Lightning protection testing

1.Direct lightning protection testing

⑴Lightning arrester testing

①Lightning arrester form: rod, belt, net and installation

②The height of the rod is measured, the protected object is measured, and the installation position is fixed.

③The size of lightning net (belt), installation position, the profile and specifications of the lightning arrester

④ Ground resistance measurement

⑵Down conductor testing

①Installation testing of the down conductor: welding condition and laying condition;

②Profile and specification testing of down conductor

③The numbers and space between down conductors

(3)Grounding system testing

①Ground resistance testing

②Soil resistivity testing

2.Equipotential Testing

⑴ Connection detection of outdoor equipment, antennas and various metal pipelines and lightning protection devices

① ①Detection of connection lead profiles, specifications and installation conditions

② Grounding resistance test of tested object

⑵ Various long metals in and out of the building, including various metal pipes (trucks) and metal components

Metal armored cable metal sheath, PE wire, ground wire and lightning protection device connection detection.

① Detection of connection lead profiles, specifications and installation conditions

② Grounding resistance test of tested object

(3)Low-voltage distribution system testing

Various long metals in and out of the building, including various metal pipes and metal components, metal armored cable metal sheath, PE wire, ground wire and lightning protection device connection detection.

3.SPD Testing

① Installation position and condition

② Configuration between SPDs

③ SPD connection method, wire length, related parameters (Iimp/In, waveform, manufacturer model)

④ Grounding resistance testing

⑤ Connection between power ground and lightning protection ground

⑥ Connecting lead profiles and specifications

Inquiry

Low voltage distribution line detection

1. Low-voltage power distribution device: visually inspect the low-voltage power distribution device settings, installation quality, cabinet wiring, grounding

2. Low-voltage distribution box (disk): Visual inspection of distribution box (disk) settings, materials, installation quality, cabinet wiring, terminal connection, and grounding;

3. Electrical Lighting Devices: Electrical safety hazard in installation and use of various lighting devices in different electric places

4. Switches and sockets: Check the switch sockets installed and used in different power places and inspect the electrical safety hazards

Power quality detection

1. Voltage fluctuation and flicker: a series of fluctuations or successive changes in the root-mean-square value of the voltage and visual perception caused by unstable illumination of the lamp;

2. Supply voltage deviation: The change of the operation mode of the power distribution system and the slow change of the load will change the voltage of each point of the power supply and distribution system. At this time, the difference between the actual voltage at each point and the nominal voltage of the system is called the voltage deviation. The voltage deviation is also commonly expressed as a percentage of the system's nominal voltage;

3. Three-phase voltage unbalance: refers to the degree of three-phase unbalance in a three-phase power system, expressed as a percentage of the rms value of the negative sequence component and the positive sequence component of the voltage or current.

Inquiry

Electromagnetic radiation

Also known as electronic smoke, it is composed of electrical energy and magnetic energy that are transferred together by space, and this energy is generated by the movement of electric charge. For example, the mobile charge generated by the RF antenna that is transmitting the signal generates electromagnetic energy. The electromagnetic "spectrum" includes a wide range of electromagnetic radiation, from extremely low frequency electromagnetic radiation to extremely high frequency electromagnetic radiation. There are also radio waves, microwaves, infrared rays, visible light and ultraviolet light. The general definition of the radio frequency portion of the electromagnetic spectrum refers to radiation having a frequency of from about 3 kHz to 300 GHz. Some electromagnetic radiation has a certain impact on the human body.

Magnetic field intensity

Magnetic field strength is first derived from the viewpoint of magnetic charge in history. Analog to the Coulomb's law of charge, people think there are two kinds of magnetic charges, positive and negative, and put forward the Coulomb's law of magnetic charges. The force that a unit fulcrum magnetic charge receives in a magnetic field is called the magnetic field strength H. Later Ampere put forward the molecular current hypothesis that there is no magnetic charge and the essence of magnetic phenomenon is molecular current. Since then, the intensity of magnetic field is mostly expressed by magnetic induction intensity B. But in the magnetization of magnetic medium, magnetic field strength H still plays an important role as a derived auxiliary quantity.

Indoor air testing

Indoor air testing is an emerging industry. It is the process of analyzing and testing the environmental pollution caused by indoor decoration and furniture addition. According to the test results, we can judge the concentration of various pollutants in the room and carry out targeted control measures. The main basis for indoor air testing is the "Indoor Air Quality Standard" GB/T18883-2002 and the "Code for Indoor Environmental Pollution Control of Civil Building Engineering" GB50325-2010.

Testing capacity