STEM electrical components German STEM models STEM prices

STEM electrical components are specifically designed to suppress high-frequency noise and spike interference on signal lines and power lines, and also have the ability to absorb electrostatic pulses. Ferrite beads are used to absorb ultra-high-frequency signals. For example, some RF circuits, PLL, oscillator circuits, and circuits containing ultra-high-frequency memory (DDR SDRAM, RAMBUS, etc.) all require ferrite beads at the power input section. Inductors are energy storage components used in LC oscillator circuits, medium and low-frequency filter circuits, etc., and their application frequency range rarely exceeds 50MHZ. Ferrite beads have very high resistivity and permeability, equivalent to a resistor and an inductor in series, but both the resistance and inductance values vary with frequency.

STEM electrical component functions

The main purposes of disconnect switches (knife switches) are: 1, to isolate the power supply, disconnecting high-voltage maintenance equipment from live equipment, creating a clearly visible break point. 2, disconnect switches operate in conjunction with circuit breakers to perform switching operations as required by the system operating mode, thereby changing the system wiring configuration. 3, to connect or disconnect low-current circuits. Disconnect switches can perform the following operations: make or break bypass currents of closed-loop switches; make or break grounding connections at transformer neutral points, but if an arc-suppression coil is connected to the neutral point, operation is only permitted when the system is fault-free; make or break voltage transformers and surge arresters; make or break capacitive currents of busbars and equipment directly connected to busbars; make or break no-load lines with capacitive currents not exceeding 5 amperes; triple-pole disconnect switches can make or break loads with voltages of 10 kilovolts and below and currents below 25 amperes. When operating disconnect switches, note that when energizing a line, first close the busbar-side disconnect switch, then the line-side disconnect switch, and finally the circuit breaker. When de-energizing a line, first open the circuit breaker, then open the disconnect switches. Do not make or break high-voltage disconnect switches under load.

STEM electrical component classification

Classification by relay operating principle or structural characteristics: (1) Electromagnetic relays: electrical relays that operate using the attractive force generated between the electromagnet core and the armature by the current in the input circuit. (2) Solid-state relays: relays where electronic components perform their functions without mechanical moving parts, providing input-output isolation. (3) Temperature relays: relays that actuate when the ambient temperature reaches a specified value. (4) Reed relays: relays that use reed contacts sealed in a tube, which act under the dual effect of contact springs and the armature magnetic circuit to open, close, or switch lines. (5) Time relays: relays whose output section delays or limits the time to a specified duration before closing or opening the controlled circuit when an input signal is applied or removed. (6) High-frequency relays: relays used for switching high-frequency and RF lines with minimal loss. (7) Polarized relays: relays that actuate due to the combined effect of a polarizing magnetic field and the magnetic field generated by the control current passing through the control coil. The direction of relay operation depends on the direction of the current flowing through the control coil. (8) Other types of relays: such as optical relays, acoustic relays, thermal relays, instrument relays, Hall effect relays, differential relays, etc.

STEM electrical component principles

Generators can convert mechanical energy into electrical energy, and dry cells can convert chemical energy into electrical energy. Generators and batteries themselves are not charged; their two poles respectively hold positive and negative charges, generating voltage (current is formed by the directional movement of charges under the action of voltage). Charges are inherently present in conductors; to generate current, only voltage needs to be applied. When conductors are connected to the two poles of a battery, positive and negative charges are released to generate current. When the charges are depleted, the charge is exhausted and the current (voltage) disappears. Dry cells and the like are called power sources. A device that converts alternating current into direct current via transformers and rectifiers is called a rectified power supply. Electronic devices capable of providing signals are called signal sources. Bipolar junction transistors can amplify incoming signals and transmit the amplified signals to subsequent circuits. For subsequent circuits, bipolar junction transistors can also be regarded as signal sources. Rectified power supplies and signal sources are sometimes also referred to as power sources.

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