What is Third Grounding What is Primary Grounding? What is Secondary Grounding?

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Grounding refers to the method of creating an electrical connection between an object and the ground. The band sells big.

There are three main types of them:

Direct grounding: The object is directly connected to the ground so that it is equal to the ground electric potential to achieve the purpose of safe grounding. It is usually used for the protection of electrical equipment, such as the grounding of electrical outlets.

Insulation and grounding: A layer of insulation material is added between the object and the ground to prevent the current from invading the inside of the object, and at the same time to achieve the purpose of safe grounding. It is usually used for the protection of high-voltage equipment, such as transformers, generators, etc.

Capacitive grounding: A certain capacitive element is connected between the object and the ground, so that a capacitive coupling grounding mode is established between the object and the ground to achieve lightning protection, filtering and other stupid vertical purposes. It is usually used for the protection of electronic devices, such as computers, communication equipment, etc.

The above three grounding methods have their own advantages and disadvantages, and the appropriate grounding methods should be selected according to different use occasions and requirements to ensure the safe operation of the equipment.

The three basic forms of grounding are protective grounding and workYesGroundingThe signal is grounded.

1. Protective grounding: Protective grounding is an important measure to ensure the normal operation of the grounding system and protect personal safety. The methods of protecting the grounding include regularly checking the grounding system, preventing the grounding wire from being damaged, preventing the grounding system from being damaged, lightning protection, and good grounding design.

Protective grounding requires regular inspection, damage prevention, vandalism prevention, and reasonable grounding design to ensure the normal operation and personal safety of the grounding system.

2. Functional grounding: Functional grounding refers to a measure to connect the metal part of electrical equipment with large metal structures on the ground or underground to achieve the safe operation of electrical equipment and protect personal safety. First, determine the design specifications, and determine the design parameters of the grounding system according to the relevant standards and specifications, such as the grounding resistance requirements, the cross-sectional area of the grounding wire, etc.

Then ensure that the geological conditions of the construction area meet the grounding requirements, prepare the required tools and materials, and finally install the grounding wire and select the appropriate grounding wire material.

3. Signal grounding: Ensuring signal grounding refers to guiding signals to the ground in electronic equipment or communication systems to ensure the stable transmission of signals and the safe operation of equipment. There are these issues to be aware of when it comes to signal grounding:

Determine design specifications, install grounding wires, maintain the independence of grounding wires, conduct regular inspections and maintenance.

Precautions for setting the ground wire

1. Design specifications: According to the power and use environment of electrical equipment, determine the design specifications of the grounding wire, including cross-sectional area, material and length. Ensure that the specifications of the grounding wire meet the national standards and electrical safety requirements.

2. Preparation: Before the grounding wire is installed, some preparations must be made. First, clean up the debris and dirt around the grounding point to ensure that the surface of the grounding point is smooth and clean.

3. Install the grounding wire: connect one end of the grounding wire to the grounding terminal of the equipment, and the other end to the grounding rod or grounding net in the grounding system. During the connection process, make sure that the connection between the grounding wire and the device and the grounding rod is firm.

Dear, hello, I am happy to answer for you, what is grounding Answer: Grounding refers to the neutral point of the electrical system and the electrical device, the exposed conductive part of the electrical equipment and the external conductive part of the device are connected to the earth through the conductor. It can be divided into working grounding, lightning protection grounding and protective grounding.

The working grounding is set by the operation needs of the power system (such as the neutral ground), so under normal circumstances, there will be a long-term flow of current through the grounding electrode, but only an unbalanced current of a few amperes to tens of amperes. In the event of a grounding fault in the system, there will be thousands of amperes of working current flowing through the grounding electrode, but this current will be divided by the relay protection device in the inner notch, even if it is a backup protection, the action is generally within 1s. Lightning protection grounding is a grounding designed to eliminate the dangerous effects of overvoltage, such as the grounding of lightning rods, lightning wires and lightning arresters.

The lightning protection grounding will only flow under the action of lightning impact, and the lightning current amplitude flowing through the lightning protection grounding electrode can reach tens to hundreds of thousands of amperes, but the duration is very short. Protective grounding is a grounding set up to prevent equipment from endangering personal safety due to insulation damage and electrification, such as metal shells, reinforced concrete poles and metal towers of power equipment. Protective grounding will only flow through the equipment if the insulation is damaged, and its value can vary over a wide range.

When the current flows through the above three types of grounding electrodes, the potential of the grounding electrodes will increase, which will affect the safety of people and equipment. For this purpose, it is necessary to limit the potential increase of the grounding electrode or to take appropriate safety measures to ensure the safety of equipment and personnel. The role of grounding is mainly to prevent people from being subjected to electric shock, equipment and line damage, fire and lightning strikes, electrostatic damage and ensure the normal operation of the power system.

Grounding is an electrical safety measure taken to ensure the normal operation and personal safety of electrical equipment, which is realized by connecting the metal wire with the grounding device, and the commonly used ones are protective grounding, working grounding, lightning protection grounding, shielding grounding, anti-static grounding, etc. The grounding device introduces the leakage current, electrostatic charge and lightning current that may be generated on electrical equipment and other production equipment into the ground, so as to avoid personal electric shock and possible fire, ** and other accidents.

Summary. Extended Materials.

Factors Affecting Ground Resistance Measurements:

1. The soil composition around the ground network is inconsistent, the geology is different, the compactness, the degree of dryness and wetness is different, and the stray current on the ground surface, especially the overhead ground wire, underground water pipe, cable sheath, etc., has a great impact on the test. Solution: Take different points for measurement, take the average value.

2. The direction of the test line is wrong, and the distance is not long enough. Solution: Find the test direction and distance.

3. The resistance of the auxiliary grounding electrode is too large. Solution: Splash water on the ground pile or use a drag reducer to reduce the ground resistance of the current pole.

4. The contact resistance between the test clip and the grounding measurement point is too large. Solution: Polishe the contact points with a file or sandpaper, and fully clamp the polished contacts with a test line clip.

5. Interference impact. Solution: Adjust the pay-off direction, try to avoid the direction of interference, so that the meter reading reduces the jump.

What is Primary Grounding? What is Secondary Grounding?

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1. The working principle is different: repeated grounding is a system of direct grounding at the neutral point, and the grounding device is connected with a metal wire in one of the zero trunk lines or in many places of the reputation. Secondary grounding, for strong electricity, the transformer virtual balance has been grounded, if there is a ground wire indoors, it is called secondary grounding.

2. The wiring position is different: repeated grounding, the construction unit should ground the terminal of the zero trunk line and the branch line of the distribution line during installation, and the zero trunk line should be grounded every 1 km. Secondary grounding, from the perspective of electronic circuit Qingdae, the circuit board can only be grounded at the thickest ground end, and cannot be grounded at a long distance.

3. The resistance limit is different: repeated grounding, the resistance should not be greater than 10 ohms. Secondary grounding, less restrictive.

Factors affecting the measurement of grounding resistance: 1. The soil composition around the ground grid is inconsistent, the geology is different, the compactness, the degree of dryness and wetness is different, and the dispersion is dispersed, and the surface of the ground is impuraneous, especially the overhead ground wire, underground water pipe, cable sheath, etc., which has a great impact on the test. Workaround:

Different points were taken for measurement, and the average value was taken. 2. The direction of the test line is wrong, and the distance is not long enough. Workaround:

Find the right direction and distance for the test. 3. The resistance of the auxiliary grounding electrode is too large. Workaround:

Splash water on the ground pile or use a drag reducer to reduce the ground resistance of the current pole. 4. The contact resistance between the test clip and the grounding measurement point is too large. Workaround:

Polishe the contact points with a file or sandpaper, and clamp the polished contacts well with a test lead clip. 5. Interference impact. Workaround:

Adjust the pay-off direction, try to avoid the direction of interference, so that the meter reading reduces the jump.

In order to discharge the current into the ground, it is necessary to firmly connect a certain part of the electrical equipment with a metal conductor to the earth, which is called grounding. According to the different uses of grounding, it can be divided into;

The use of earth as a conductor (such as DC working grounding) or in order to eliminate the increase in the voltage of the charged body of the equipment to the ground and grounding is called working grounding. In order to ensure personal safety and equipment safety, the grounding is called safety grounding.

Grounding: working grounding, lightning protection grounding and protective grounding.

Grounding: working grounding, lightning protection grounding and protective grounding.

Grounding as a measure, bai originated strongly.

Electrical technology, due to the strong electric voltage is high and the capacity is large.

DAO, which is easy to endanger personal exclusivity.

The safety of the device. Therefore, from the perspective of safety, the shell, chassis and base of electrical equipment should be well connected with the ground to form an equipotential, so as to ensure the safety of people and equipment in the fault state.

There are two commonly used grounding methods for electrical equipment protection:

1) Protection zero: The neutral wire in the three-phase four-wire power supply system is the protection neutral line, which is an important part of the circuit loop.

The neutral line is not allowed to be disconnected in the power supply system.

2) Protective grounding: In addition to the neutral line, it is also equipped with a protective grounding wire, which is connected with the shell, chassis, base and other metal parts of electronic and electrical equipment, under normal circumstances, the protective grounding wire is not current flowing, even if there is a current, it is a very small leakage current, so there is no voltage drop on the protective grounding line, so that the metal shell of the electronic and electrical equipment connected to it presents the ground potential.

Grounding is called "electrical grounding". The point at which the live conductor has a radius of 20 meters is the electrical "ground". Commonly used back.

There are three types of grounding; The first answer is lightning protection grounding (when lightning is formed, the lightning overvoltage is instantly and reliably introduced into the ground through the lightning protection grounding device to effectively protect the safety of personal equipment).

The second is working grounding (the need to ensure the normal operation of electrical equipment, such as the grounding of the center point of the transformer).

The third is protective grounding (in order to ensure personal safety, the electrical equipment with metal shells is not charged during normal operation, and the equipment that may carry dangerous voltage is grounded (zero) during fault. Usually the three types of grounding share a grounding body.

1 Worker bai

Grounding work grounding is also called system DU grounding, which is based on the needs of the normal operation mode of the power system. For example, the neutral point of the three-phase system is grounded, and its function is to stabilize the potential of the power grid to the ground, so that the insulation to the ground can be reduced, and it can also be easily detected when the insulation flashover or breakdown to the ground is easy to detect, and it is conducive to the implementation of relay protection measures.

2 Protective Grounding.

Protective grounding is also called safety grounding, the metal shell of electrical installations, the structure of power distribution devices and line towers, etc., may be charged due to insulation damage, and the grounding is set up to prevent it from endangering the safety of people and equipment.

For details, please refer to the relevant information of China Electronics DIY Home.

Lightning protection and grounding! Grounding can lead lightning underground.