Three-phase power and two-phase power are often encountered in our daily lives, but many people don't know much about what three-phase power and two-phase power are. In simple terms, three-phase electricity is a three-phase AC power supply, which is a form of transport of electrical energy, and two-phase electricity is two lines, one zero line and one line of fire. What is the difference between three-phase power and two-phase power ? For non-professional friends, it is inevitable that there will be such questions. Don't worry, if you have this need, you may wish to follow me to learn about the difference between three-phase power and two-phase power .
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!
What are the requirements for applying for a three-phase electricity meter?
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.
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.
The difference between three-phase power and two-phase power
Three-phase power is ABC three-phase, phase and phase voltage is 380V, two-phase power is phase and neutral voltage is 220V.
Two-phase electricity is two strands, one is fire, one is zero, is the ordinary 220V.
Three-phase power is a relatively high power user. Take any one of the phases and a zero is 220V, and take any of the two phases is 380V, according to the labeling of electrical appliances. The general home access line has a total power supply of 220V, but some buildings have a three-phase junction box, which is designed by the designer considering that the user may use it.
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).
According to regulations, the neutral point of a 380V (three-phase) civil power source should not be grounded at the entry end (grounded on the transformer side. This grounding is based on the fact that points above the power supply voltage cannot be caused by the floating point position. 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 function of the leakage protector. (The working principle of the leakage protector is: If there is a live wire touched by the human body, that is, the fire wire, or the internal leakage of the electrical equipment, then the current flows from the live wire through the human living appliance housing. Earth, without flowing through the neutral line, the current of the live line and the neutral line will not be equal. The leakage protector immediately detects the current difference and immediately trips to protect the safety of the person and the electrical equipment. Generally, this differential current is selected in tens of milliamperes. If the neutral point of the power supply is directly grounded (this is not allowed in civil power construction), the leakage protector will lose its function and the short circuit of the human body and the electrical equipment cannot be protected.
Editor's summary: Electrical energy is an indispensable source of energy for us today. With less electricity, we cannot accomplish many things. The factory needs to use electricity to produce products. We also need electricity in our daily lives. If we suddenly lose power, we will not feel very accustomed to it. How important is electricity in our lives? However, we must also pay special attention to safe use during the use of electricity. All in all, we have deepened our understanding of three-phase power and two-phase power so that we can use the power supply more correctly.
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