What is the relay contactor
Inductance ballast is also known as reactor, choke, and inverter. It is a lagging ballast, which is the lamp current phase lags behind the power supply voltage phase. The practical application of electronic ballasts and divided into two kinds: (1) to low voltage dc power supply (voltage below 250 v) power supply circuit, it through the time rate of change of the inductance on the voltage is proportional to the current to adjust the lamp current. The lamp tube is in 20 ~ 100kHz working condition. The main application is the gas discharge source circuit with ac power supply. Comparing with the ballast resistance, its power consumption is small, in addition to the direct power supply are working under power frequency (typically 50 hz or 60 hz), can improve the stability of the lamp current waveform and light work. Electronic ballast with the various lamp ballast, the inductance type ballast iron core made of ferromagnetic material, made of enameled wire coil and insulation material composition and processing technology are similar to ordinary transformer processing technology. Inductance ballast is according to the power supply voltage, the lamp voltage and light current design, the main guarantee the electrical parameters of the lamp, also considering loss, temperature and other parameters. It can also greatly improve the ability to repeat fire. In practical application, the inductance ballast is stable and reliable, but it is heavy and noisy.
In the circuit of the gas discharge lamp, the installation is between the power supply and one or more of the electric light, so that the lamp can stabilize the work and limit the lamp current to the required number of devices. There is also a quick start ballast to improve startup performance, instant start ballast, etc. The ballast can be composed of resistors, inductors, capacitors and leakage transformers, and can be composed of these devices or electronic components. Action principle Most of the gas discharge lamp is made using arc discharge characteristics, such as test tubes start performance start ballast, that is negative voltage drop with the increase of current features (also called negative resistance characteristics), it is impossible to establish a stable working point. In order to stabilize the discharge and limit the working current of the lamp, the ballast must be set in the gas discharge source circuit. The ballast has become an important addition to the gas discharge source circuit
A contactor is a magnetic field that is used by an industrial electrical current to generate a magnetic field, which causes the contact to be closed to achieve the control load. The contactor consists of an electromagnetic system (iron core, static iron, electromagnetic coil) contact system (often open contact head and often closed contact) and an arc extinguishing device. Its principle is that when the electromagnetic contactor coil, after the power supply will generate strong magnetic field, the static electromagnetic suction attracting armature iron core, and drive the contact action: normally closed contacts disconnect; Often the contact is closed and the two are interconnected. When the coil is out of power, the electromagnetism dissipate, and the armature is released by the release of the spring, making the contact return. Open contact and disconnect the search In industrial electricity, the number of contactors is a lot. The range of the current at 5a-1000a is quite extensive. Because can quickly cut off the ac and dc main circuit and can frequently connected with large current control (some don't up to 800 amps) circuit of the device, so often used in motor as control object, also can be used as a control plant equipment, electric heater, machine tools and all kinds of power unit and so on electric power load, and as a remote control device
Relay is an electronic control device, it has a control system (also called input circuit) and control system (also called the output circuit), usually used in automatic control circuit, it is actually with less current to control large current of a kind of "automatic switch". In the circuit, the function of automatic regulation, safety protection, switching circuit etc.
The working principle of a relay, relay (relay) and features When the input (such as voltage, current, temperature, etc.) to achieve specified value, make the output of the controlled circuit conduction or broken appliances. It can be divided into two kinds: electric capacity (such as current, voltage, frequency, power, etc.) relay and non-charge (such as temperature, pressure, speed etc.). It has the advantages of fast moving, stable job, long service life and small volume. Widely used in power protection, automation, movement, remote control, measuring and communication. Relay is an electronic control device, it has a control system (also called input circuit) and control system (also called the output circuit), usually used in automatic control circuit, it is actually with less current to control large current of a kind of "automatic switch". In the circuit, the function of automatic regulation, safety protection, switching circuit etc
