Electric Power (Power Station,Power Tower)

Our company's grounding materials are widely used in power systems, such as nuclear power stations, thermal power stations, hydropower stations, wind power stations, power plants, booster stations, transmission and transformation circuit transmission tower poles, etc.

Successful Cases of Copper Clad Ground Wire in Power Systems

With the development of the economy, the safety of the substation grounding system has increasingly attracted the attention of the electric power industry. Galvanized steel grounding system has poor corrosion resistance and short service life, which becomes a hidden danger of safe operation, in addition to the need for frequent maintenance, maintenance costs are too high, increasing the labor intensity of power workers. In response to the above problems, substations mostly use copper-clad steel grounding system, not only to overcome the shortcomings of the steel grounding system, but also greatly improve the level of safe operation of the power grid. As an important part of the power grid substation in the safe operation, to protect the residents of life and oil and gas production power supply is undoubtedly significant; substation safety operation requirements are the first and foremost. Drawing on advanced experience at home and abroad, the earth rod suppliers adopt new materials and new technology to continuously strengthen the anti-corrosion capacity of the grounding network and improve the safety level of the grounding network.

It is well known that copper is better than steel as a grounding material. Copper has good electrical conductivity and high corrosion resistance. The surface of copper produces an extremely adherent oxide - copper green, which provides excellent protection to the copper inside and blocks the formation of corrosion. It goes without saying that copper grounding systems are expensive. In order to reduce the project cost, in general corrosive places vertical grounding pole often use copper-clad steel material instead of pure copper. In developed countries, due to copper clad steel material both copper good electrical conductivity and steel strength, and has a very strong anti-corrosion performance, copper clad earth rod has been widely used in grounding devices.

Electrical main wiring mainly refers to the circuit for transmitting electrical energy in power plants, substations and power systems designed to meet the predetermined requirements for power transmission and operation, indicating the interconnection relationship between high-voltage electrical equipment. The electrical main wiring takes the power inlet and outlet lines as the basic links, and the bus bar as the intermediate link to form the electrical energy transmission and distribution circuit. Generally, the main copper clad stainless steel wire of power plants and substations should meet the following basic requirements.
(1) To ensure the necessary reliability of power supply and power quality according to the requirements of the system and users. The less the chance of forced interruption of power supply during operation, the higher the reliability of the main wiring.
(2) the main wiring should have a certain degree of flexibility and to adapt to the power system and the main equipment requirements of various operating conditions, in addition to easy access.
(3) the main wiring should be simple and clear, easy to operate, so that the main components into or out of the required operation steps at least.
(4) In the condition of meeting the above requirements, the investment and operating costs are minimal.
(5) The possibility of expansion.

Grounding of high voltage systems

Classification by grounding method
(1) Direct grounding system, that is, the neutral point of the transformer or generator is connected to the grounding device directly or through a small resistance. This grounding system, when a single-phase grounding short circuit, grounding current is very large, so also called high current grounding system.
(2) Not grounding system, that is, the neutral point of the transformer or generator is not connected to the grounding device or through the protection, measurement, signal instrumentation, arc extinguishing coils and grounding equipment with large resistance and grounding device connected. This grounding system, when a single-phase grounding short circuit, grounding current is very small, so also called small current grounding system.

Classification by grounding equipment
(1) Earth electrode system without grounding equipment, the neutral point of the transformer or generator is not grounded directly by any grounding equipment or not grounded.
(2) By reactance or arc extinguishing coil grounding system, the neutral point of the transformer or generator is connected to the grounding device through the arc extinguishing coil.
(3) Grounding system by resistance, the neutral point of the transformer or generator is connected to the grounding device through a resistor. Resistor for high resistance value is called high resistance grounding system, resistor for low resistance value is called low resistance grounding system.
(4) By reactance compensation, resistance parallel grounding system, the neutral point of the transformer or generator through the reactor and resistor connected in parallel to the ground, where the reactor is appropriate to use standard specifications of the arc extinguishing coil.

Grounding of low-voltage systems

According to IEC (International Electromechanical Commission), the earth electrode system for low-voltage systems generally consists of two letters, with subsequent letters added if necessary. Because the IEC uses French as the official document, the letters used are the initials of the corresponding French characters.
The first letter: indicates the relationship of the power grounding point to the ground. T: Terre, which means direct grounding; I: Island, which means not grounded, or connected to the earth through impedance.
The second letter: indicates the relationship between the exposed conductive part of the electrical equipment and the ground. Where T: indicates a direct ground independent of the power grounding point; N: Neutre, indicates a direct connection to the power system grounding point or to the conductor leading from that point.
Subsequent letters: indicates the relationship between the neutral and the protective earth. Where C: Combinaison, indicating that the neutral N and protection ground PE combined into a PEN line; S: (Separateur letter S) séparer (French, make separate; make distant; separated; distinguished).
indicates that the neutral line is separated from the protective earth line; C-S: indicates that the PEN line is on the power side, and the N and PE lines are separated from a certain point.
Therefore, according to the above classification method, there are five types of power distribution systems by grounding system: IT, TT, TN-C, TN-S, TN-C-S.





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