How to wire the power switch

How to connect the power switch, now we can't do without all kinds of electrical appliances. Whenever we add a new appliance or move it slightly, the wiring of the switch is something we need to consider. Let's see how the power switch is wired.

How to connect the power switch How to connect the 1 switching power supply

1. If the switch is single-connected, then one terminal on the switch is connected to the live wire, one terminal is connected to the control line, and the control line is connected to the lamp holder.

2. In case of single connection, double connection and triple connection, the terminals are connected with live wires, and then the same warp is used as a jumper to connect other terminals in the same row, and the other terminals are connected with control wires, which are respectively connected to the corresponding lamp holders.

3. If it is single-on and double-control, then the monopole is connected with the live wire and the control wire respectively. The other two terminals in the switch box are respectively connected with two terminals in another switch box through overflow grooves.

4. For the socket with switch, just connect one end of the terminal in the switch to the live wire, and the other end will use an equal-diameter wire as a jumper to connect to the live wire of the socket.

Composition of switching power supply

Switching power supply consists of four parts: main circuit, control circuit, detection circuit and auxiliary power supply.

1, main circuit

Surge current limit: limit the surge current at the input side at the moment when the power supply is turned on.

Input filter: its function is to filter the clutter existing in the power grid and prevent the clutter generated by this machine from being fed back to the power grid.

Rectification and filtering: the AC power supply of the power grid is directly rectified into a smoother DC power supply.

Inverter: converts the rectified DC into high-frequency alternating current, which is the core part of high-frequency switching power supply.

Output rectification and filtering: provide stable and reliable DC power supply according to load requirements.

2. Control circuit

On the one hand, sampling from the output end, comparing with the set value, and then controlling the inverter to change its pulse width or pulse frequency to make the output stable; On the other hand, according to the data provided by the test circuit, after being identified by the protection circuit, the control circuit is provided to carry out various protection measures for the power supply.

3. Detection circuit

Provide various parameters and various instrument data in the operation of the protection circuit.

4. Self-provided power supply equipment

Software (remote) startup of power supply is realized to supply power for protection circuit and control circuit (PWM and other chips).

Our daily life is inseparable from electricity, which brings us a lot of convenience. But electricity is also very dangerous, and people are in danger every day because of improper use. Moreover, switching power supply is not a simple electrical appliance, and it needs very professional knowledge as the background to be dismantled and repaired.

If non-professionals know some superficial knowledge, don't disassemble and repair the switching power supply by themselves, otherwise accidents will easily occur.

How to wire the power switch How to wire the LED switching power supply?

1, connect the special grounding device. If there is no special grounding device, you can drive a steel bar into the ground and connect the wires to make a simple grounding device. Lead the homemade grounding wire to the protective wire behind the socket.

2. The protective wire behind the socket is directly connected to the neutral wire. Remember not to connect the zero line in the same socket, although the principle of the two is similar.

Selection skills of Led lights

Look at the packaging and trademarks.

The state requires LED lamp manufacturers to mark the following contents on the outer packaging: rated voltage, voltage range, rated power and rated frequency. Generally speaking, the trademark printing quality of high-quality products is good, the font is clear, it is not easy to fall off, it is wiped with a soft wet cloth, the logo is clear and identifiable, and it is not easy to erase, and there are manufacturer's trademarks and related certification marks.

Second, look at the appearance of LED tubes.

Real LED energy-saving lamps are tricolor tubes, which are whiter when covered by hands. In addition, from the perspective of lamps, we can compare multiple lamps together. Lamps with good consistency in shape and size are mostly formed by machine bending, and most of them are mass-produced products.

Third, look at the working temperature.

Under normal working conditions, the temperature rise of LED energy-saving lamps should be very low. Otherwise, the life of LED energy-saving lamps is very short. At the same time, when the energy-saving lamp is lit, it flashes quickly or fluctuates violently, indicating that the energy-saving lamp has quality problems.

Dual power switches are widely used in high-rise buildings, residential quarters, hospitals, airports, docks, fire protection, metallurgy, chemical industry, textiles and other important places where power failure is not allowed.

It is very important in industrial production, but it is rarely used in home decoration. Although not, today we are going to introduce the connection method of dual power automatic transfer switch.

What is a dual power switch?

The dual power switch is mainly composed of molded case circuit breakers or disconnectors. As an executive element, it has an automatic controller with a single chip microcomputer as the core and an electromechanical interlocking control mechanism. It is a dual power switch with perfect performance, high degree of automation and wide application range.

Dual power switches are widely used in hospitals, airports, docks, fire protection, metallurgy, chemical industry, textiles and other important places where power failure is not allowed, so as to realize unattended continuous power supply.

How to connect the dual power switch in kind?

First of all, determine whether to use automatic wiring mode or automatic manual wiring. If it is fully automatic wiring, first connect 10 1 and103; Connect 104 and 105, then connect 106 and 303, 106 and 305, then connect1kloc-0/and 302, and finally connect 20 1. This is a fully automatic connection mode.

How to connect the automatic switch of dual power supply?

First, when wiring, pull the common power supply N into the common power supply executive circuit breaker QN, and the standby power supply R is connected with the standby power supply executive circuit breaker QR.

2. When QN and QR are four-pole circuit breakers, the connection mode shall be as per the wiring diagram, in which 1, 3 and 5 of QN and QR are three-phase incoming terminals, 2, 4 and 6 are three-phase outgoing terminals, 7 is neutral incoming terminal and 8 is neutral outgoing terminal.

Thirdly, if the circuit breaker is a three-pole circuit breaker, the zero line NN of the common power supply (N) and the zero line NR of the standby power supply (R) must be connected to the zero line end of the three-pole special wiring at the same time.

Fourthly, the working power of the automatic controller of dual-power transfer switch is taken from the incoming terminal and zero line of circuit breakers QN and QR. If a three-pole circuit breaker is selected for the circuit breaker, two neutral lines NN and NR must be connected, and the neutral line end of the three-pole special wiring is in the middle of the two circuit breakers.

Code for operation of dual power switch

1. When the power supply is cut off for some reason and cannot be restored in a short time, the standby power supply must be enabled.

Two, to restore power supply, to do a good job of power conversion in time, cut off the standby power supply, restore the mains power supply.

Third, check whether all instruments and indicator lights are normal and start the cooling fan in the transformer.