First, the role of capacitors
The basic working principle of the capacitor is charging and discharging, of course, rectification, oscillation and other functions. In addition, the structure of the capacitor is very simple, mainly composed of two positive and negative electrodes and an insulating medium sandwiched between them, so the type of capacitor is mainly composed of electrodes. And the dielectric medium is determined. Capacitors are used in many ways, mainly as follows:
1. DC blocking: Prevents DC from passing through and allows AC to pass.
2. Bypass (decoupling): Provides a low impedance path for certain parallel components in an AC circuit.
3. Coupling: As a connection between two circuits, the AC signal is allowed to pass through and be transmitted to the next stage of the circuit.
4. Filtering: This is very important for DIY, the capacitance on the graphics card is basically this effect.
5. Temperature compensation: compensates for the influence of other components on the temperature, and compensates to improve the stability of the circuit.
6. Timing: Capacitors are used in conjunction with resistors to determine the time constant of the circuit.
7. Tuning: System tuning of frequency-dependent circuits such as cell phones, radios, and televisions.
8. Rectification: Turns the semi-closed conductor switching element on or off at a predetermined time.
9. Energy storage: Stores electrical energy for release when necessary. For example, camera flash, heating equipment, etc.
Second, capacitor manufacturers and product prices:
1. Schneider capacitor:
(1) Three-phase independent units are integrated in the capacitor tank, and each unit uses a metal-treated polypropylene film as an insulating medium. Special shell design and metal plating technology improve self-healing ability.
(2) Unique anti-shock terminals, integrated with discharge resistors, and special torque fastening design to ensure a tight connection with the cable.
(3) The capacitor can be filled with a special resin material (no polychlorinated biphenyl) to ensure good thermal stability and heat dissipation.
Schneider EasyCan capacitor; capacitor CAN SDY 20.8/25 KVAR 480V Market reference price: 432.6 yuan / only.
Schneider EasyCan capacitor; capacitor CAN SDY 17/20.4 KVAR 480V Market reference price: 357.01 yuan / only.
Schneider EasyCan capacitor; CAPACITOR CAN SDY 20/24KVAR 400V Market reference price: 499.8 yuan / only.
2. ABB capacitors:
(1) CLMD series capacitors, capacitor units are designed to provide users with high reliability, safety and superior performance and power in a tight and compact manner.
(2) The basic unit of CLMD13 is very suitable for modular systems.
(3) CLMD33 is small in size, professional capacitor group design, can provide high energy power.
ABB capacitor; CLMD43-20KVAR 440V50HZ, connection method: triangular connection market reference price: 1414 yuan / only.
ABB capacitor; CLMD13-12.5KVAR 600V 50HZ, connection method: triangular connection market reference price: 823 yuan / only.
ABB capacitor; CLMD43-30KVAR 690V50HZ, connection method: triangular connection market reference price: 1587.99 yuan / only.
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