Strong power generally refers to the power system of the mains system\lighting system, including air conditioning lines, lighting lines, outlet lines, power lines, high-voltage lines and the like. The layout of the circuit can not but be avoided in the decoration, and people often hear about the strong knowledge of the circuit. So, do you know the difference between strong electricity and weak electricity? Don't worry, I've compiled a strong knowledge book for everyone. Of course, as long as you have this strong knowledge , you never have to worry about the renovation of the hydropower stage.
What is strong electricity
The concept of strong electricity is relative to weak electricity. Strong and weak currents are voltage demarcated. The working voltage is more than 220V AC is strong, and the following is weak.
Strong electric generally refers to alternating voltages above 24V. Such as home lights, sockets, etc., the voltage is 110 ~ 220V. Electrical appliances such as lighting fixtures, refrigerators, televisions, and audio equipment (input terminals) in household electrical appliances are all strong electrical equipment.
Strong Electric Category: Power Engineering (above 10KV) Power Supply and Distribution Engineering (10KV/380V/220V) are all strong. Strong electrical equipment: high voltage circuit breakers, high voltage cabinets, transformers, sockets and so on. These devices are characterized by operating voltages above 220V.
What is a strong box
Strong electric box is the distribution box. The voltage inside the distribution box is generally 380/220V, which is used for electrical energy distribution. The following can be equipped with various electrical equipment such as lights, fans and water pumps. The switch box for homes is a kind of distribution box.
What is Matching
The matching group is: a battery with a similar battery capacity and a similar battery voltage is used in series.
Strong electricity identification
1, strong electricity does not mean power. A lot of power is used for power, such as motors, air conditioners and elevators, but strong power is also used to power computers, televisions, and other devices. Another example is the power of electric vehicles is 12V battery, it can not be called strong electricity.
2, can not be divided by frequency or AC and DC. For example, 800KV DC transmission must be strong.
3, can not be divided by the current size. The operating current of many high-voltage devices can be very small, while the communication power supply is low-voltage and high-current.
Classification of strong electricity
Electronic people are used to being divided into two parts: strong electricity (electricity) and weak electricity (information). The two are both related and different. In general, the object of processing a strong current is energy (electricity). Its characteristics are high voltage, large current, large power, and low frequency. The main consideration is to reduce losses and improve efficiency. The main object of the processing is information, that is, information transmission and control. Its characteristics are low voltage, low current, low power, and high frequency. The main consideration is the effect of information transmission, such as the fidelity, speed, and breadth of information transmission. ,reliability. In general, weak current projects include television engineering, communications engineering, fire engineering, security engineering, imaging engineering, etc., as well as integrated wiring projects for the above-mentioned projects. Weak electricity is for strong electricity. Strong electricity = (380/220), no matter high pressure.
The use of strong electricity
Strong power generally refers to the power system of the mains system\lighting system, including air conditioning lines, lighting lines, outlet lines, power lines, high-voltage lines and the like. There are mainly two types of weak current: one is the low-voltage electrical energy, such as safe voltage level and control voltage, which is stipulated by the country, and it is divided into AC and DC, such as 24V DC control power supply, or standby power supply for emergency lighting. The other category is information sources that carry information such as voice, images, and data, such as audio and video lines, network lines, and telephone lines. The DC voltage is generally within 36V. Electrical appliances such as telephones, computers, televisions (cable television lines), audio equipment (output lines), broadcasting systems, and building automation (such as access control and security) in household electrical appliances are all weak electrical equipment.
In power systems, voltages below 36V are called safe voltages, voltages below 1kv are called low voltages, voltages above 1kv are called high voltages, and lines that directly supply power to users are called distribution lines, such as user voltages are 380/220v, It is called a low-voltage distribution line, which is the strong electricity in home decoration (because it is the highest voltage for home use). Strong electric generally refers to direct current voltage above 24V. Such as home lights, sockets, etc., voltage 110V ~ 220V. Household electrical lighting, electric water heaters, heaters, refrigerators, televisions, air conditioners, audio equipment and other electrical appliances are strong electrical equipment.
The difference between strong electricity and weak points
Strong and weak currents are relative concepts. Conceptually, the main difference is the difference in use. It is not possible to define the relationship between the two voltages simply by voltage (if you need to specify the voltage to distinguish between them, then put 36V (human safety). The voltage above) is defined as a strong electric power, and 36V (human body safety voltage) is defined as weak electric power below.) The two are both related and different. The general principle of distinction is: the object of treatment of strong electric power is energy (electricity), and its The characteristics are high voltage, large current, large power, and low frequency. The main consideration is to reduce losses and improve efficiency. The object of weak current processing is mainly information, that is, information transmission and control, characterized by low voltage, low current, and power. Small, high frequency, mainly consider the effect of information transmission, such as fidelity, speed, breadth and reliability of information transmission. They roughly have the following differences:
(1) Different AC frequencies
The frequency of strong electricity is generally 50Hz (Hz), which is called "power frequency", which means the frequency of industrial electricity: the frequency of weak electricity is often high-frequency or ultra-high frequency, measured in KHz (kilohertz) and MHz (megahertz).
(2) Different transmission methods
Strong electricity is transmitted on transmission lines, and weak electricity transmission is divided into wired and wireless. The radio transmits electromagnetic waves.
(3) Different power, voltage, and current
Strong electric power in KW (kilowatts), MW (megawatts), voltage in V (volts), KV (kilovolts), current in A (ampere), kA (kiloampere); weak electric power in W (watts) , mW (milliwatts), voltage in V (volt), mV (mV), current in mA (milliampere), uA (microampere), so its circuit can be printed circuit or integrated circuit composition.
There are also high-frequency (hundreds of KHz) and medium-frequency devices in high-voltage power supplies, but the voltage is high and the current is large. Due to the development of modern technology, weak electricity has penetrated into the field of strong electricity, such as power electronic devices, wireless remote control, etc., but these can only be regarded as a weak electric control part in strong electric power, and it is still different from the controlled strong electric power.
According to the basic principle of weak electricity transmission signals and strong electric conduction, we can easily distinguish between strong electricity and weak electricity. For example, although electric shavers, flashlights, etc., use only two dry batteries (3V), we cannot think that they are weak because the voltage and current of the appliances are small, because they conduct electricity rather than signals, so they should be classified as strong. class.
From the above description, the relationship between the four can be roughly stated as follows:
High voltage must include strong electricity, and high voltage does not necessarily belong to high pressure.
Low voltage must include weak electricity, weak electricity must belong to low pressure;
Low voltage is not necessarily strong, and strong power is not necessarily low pressure.
Editor's summary: The above is the introduction of the relevant knowledge about the difference between strong electricity and weak electricity in the encyclopedia of energetic knowledge, and hopes to help those who have such needs! For more information, please continue to pay attention to our website, follow-up will show more exciting content.
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