Electricity can be said to bring us a lot of convenience. What I want to introduce today is three-phase electricity. For the first time to contact with friends, it is inevitable that there will be doubts about what is the three-phase power and the three-phase power . In simple terms. Three-phase alternating current is a form of transportation of electrical energy, referred to as three-phase electricity. A three-phase AC power source is a power source composed of three alternating current potentials with the same frequency, equal amplitude, and a phase difference of 120° in succession. Next, I will take everyone to understand how to connect the three-phase power and other related knowledge. I hope to help you!
What is three-phase electricity
The three-phase power source is the power source that people generally talk about. It is a 380 volt AC power system. It is composed of three fire lines and does not use zero lines. It is generally used for power consumption in factories and enterprises. Any combination of a three-phase supply of live and neutral will constitute a single-phase power supply.
Single-phase power refers to the 220-volt AC used in the home, which is the mains power. It consists of a live wire and a neutral wire. The three-phase power supply is what people generally call power, and it is 380 volts AC, which consists of three fire wires. The composition, without the zero line, is generally used for electricity in factories and enterprises. Any combination of a three-phase supply of live and neutral will constitute a single-phase power supply.
Three-phase electricity prices
The price of three-phase electricity is around 80 yuan. In daily life, the single-phase power supply is also used, which is also called lighting electricity. When powered by lighting electricity, one of the three-phase electricity is used to supply electricity to a relatively powered device, such as a household appliance, and the other line is the fourth of the three-phase four-wires, that is, the neutral line therein. The neutral line leads from the three-phase neutral point.
Note: This price is for reference only! Due to geographical differences, of course, the price will be different. For more details on the prices, please refer to the local distributors!
The difference between three-phase power and two-phase power
The difference between the three-phase power supply and the two-phase power supply: The power generated by the generator is three-phase. Each phase of the three-phase power supply and its neutral point can form a single-phase loop to provide users with power energy. Note that the AC loop cannot be called the positive or negative pole. It should be called the line end (called the fire line in the civilian electricity) and the neutral line (the neutral line in the civilian electricity).
How to apply for three-phase electricity
You can go to the hall service window of the electrical management department where you live and fill in the form after applying. Go back and wait for the notice. Waiting for the electric power bureau to conduct a field trip:
1) Can you install the line?
2) Whether the user meets the installation conditions and so on.
3) If the conditions are met, the Electric Power Bureau will immediately notify you of the call industry bureau to handle all relevant formalities.
4) Determine the required cost based on the distance of the route and your declared load.
5) After all procedures have been completed. Pay within ten working days. The Electric Power Bureau promised a single-phase table for seven working days, and the three-phase table was completed within ten working days.
Three-phase electricity application materials directory
1. Original and copy of corporate identity card
2. Original and copy of the real estate license (land permit and construction permit)
3. Original and copy of the original tax registration certificate
4. Original and copy of original business license
5. Application report
6. Equipment list
7. Bank opening permit
8. Power of Attorney
Precautions
1. The load of the meter can be achieved by matching the inductor with different ratios. For example, a meter with a size of 3x1(2)A is equipped with an inductor coil. If the ratio of the selected inductor coil is 1:50, the maximum rated current per phase can be 100A.
2. The power generated by the generator is three-phase. Each phase of the three-phase power supply and its neutral point can form a single-phase loop to provide users with electrical energy. Note that the AC loop cannot be called the positive or negative pole. It should be called the line end (called the fire line in the civilian electricity) and the neutral line (the neutral line in the civilian electricity).
3. According to regulations, the neutral line of a 380 V (three phase) civil power supply should not be earthed at the entry end (grounded at the transformer end. This grounding is based on the fact that the potential above the supply voltage cannot be caused by the floating potential. The grounding of the customer end and the grounding of the transformer end have a certain resistance in the earth. The power supply mode is a fire line and a neutral line (neutral lead-out line) to form a loop, and in the single-phase three-core power jack Connected to a ground wire. This is in consideration of the realization of the leakage protector function.
How to connect three-phase power
Three-phase power is provided with both star and delta connections at the power supply (or transformer) and the load.
The three-phase electricity star-connection method is to connect one end of each phase power supply or load to one point, and the other end of the phase connection serves as a lead-out line, which are three phase lines of three-phase electricity. For star connection, the midpoint (called the neutral point) can be extracted as a neutral line to form a three-phase four-wire system. It can also lead to three-phase three-wire system. Of course, ground wires can be added to the three-phase five-wire system or three-phase four-wire system regardless of whether there is a neutral line or not.
The delta connection method of three-phase electricity is to connect the power sources or loads of each phase one by one, and to connect each connected point as three phase lines of three-phase electricity. The delta connection has no neutral point, nor can it lead to a neutral line. Therefore, there is only three-phase three-wire system. After adding the ground wire, it becomes a three-phase four-wire system.
In star-connected three-phase power, the line voltage is twice the phase voltage, and the line current is equal to the phase current. When the three-phase load is balanced, no current flows through it even if the neutral line is connected. When the three-phase load is not balanced, the neutral line should be connected, otherwise the load of each phase will be different from the partial pressure.
Editor's summary: From ancient times to the subsequent development of society, people created electricity, which made life easier and faster. The transmission of electricity is an urgent problem that humans need to solve. Therefore, scientists have continued to study the transmission of electricity.
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