Core Difference
1. The magnitude and direction of alternating current change periodically with time, while the direction of direct current remains constant.
2. Alternating current has no positive or negative poles, it can be either positive or negative.
3. In power transmission lines using cables, direct current transmission does not generate capacitive current, while alternating current transmission lines have capacitive current, which is prone to cause losses.
4. The current and voltage of alternating current are unstable, while the voltage and current of direct current are stable.
5. The loss of direct current transmission is smaller than that of alternating current transmission when a fault occurs.
Key Characteristics Comparison
|
Feature |
(DC) |
(AC) |
|
Direction of current |
fixed |
Periodical change |
|
Voltage stability |
Stabilize |
Changing over time (such as a sine wave) |
|
Producing way |
Batteries, solar panels, direct current generators |
Alternating current generator, utility power grid |
|
Transmission loss |
Higher (with low efficiency for long-distance transmission) |
Lower (can be elevated or reduced by a transformer) |
|
Typical application |
Electronic devices, electric vehicles, LED lights |
Household electricity usage, industrial motors, power grid transmission |
Why is the power grid mainly using alternating current?
Historical reasons: In the "current battle" between Tesla and Edison, alternating current won due to its transmission advantages.
Technical advantages: Alternating current can be easily stepped up (with low losses in high-voltage transmission) or stepped down (safe for household use) through transformers.
Simple and flexible: The structure of alternating current generators is simple, and they are easy to drive electric motors.
A simple example of life
Power bank: Stores direct current (the essence of batteries is DC) and supplies power to mobile phones (mobile phones use DC internally).
Wall socket: Provides alternating current (such as 220V/50Hz), which is converted into direct current by a charger and used to charge mobile phones.
in Summary
Alternating current is "alternatingly changing", suitable for long-distance transmission and motor drive.
The two are converted into each other through "rectification" (AC→DC) and "inversion" (DC→AC) technologies to meet different needs.
Products Description
VSM-12 indoor permanent magnetic vacuum circuit breaker is used for rated voltage 12kV, AC 50/60Hz indoor switchgear, adopting monostable permanent magnetic actuator, frame one-piece layout, suitable for all kinds of industrial and mining enterprises, power grid equipment, trolley unit and KYN28A-12 switchgear supporting the use of the unit, but also can be used as a fixed unit with the corresponding position interlocking, used in the XGN2 and other Fixed cabinet.
Shaanxi West Power Tongzhong Electrical Co., Ltd. is a leading manufacturer with over 20 years of experience, specializing in high quality 7 to 40.5kV vacuum circuit breakers, switchgears, and a wide range of electrical products. Our advanced manufacturing process ensures reliable, durable solutions, especially our VTZ series vacuum circuit breakers, which are maintenance-free for up to 20 years. With a team of expert technicians, we excel in R&D, manufacturing, and after-sales service for both high and low voltage equipment, delivering excellence at every stage.
Shaanxi West Power Tongzhong Electrical Co., Ltd.
Our address
Nanpo Village, Chencang Avenue Jintai District Baoji City, Shaanxi Province, China.
Phone Number
+86-18091765882(whatapp/facebook/wechat )
