A network filter - what is it? Network filter for computer

Some computers are connected to the network directly through the outlet. All experts unanimously assert that this action is unacceptable because of constant power surges in the network. To protect the PC from these unwanted overloads, you need to use network filters. Depending on their type, they are able to remove voltage surges. In the results, the processor can last many years and not burn. In addition, the network filter for the computer protects the connected speakers, monitor, printer and other devices from the loads.

Externally, the power filter resembles an ordinary extension cord, consisting of outlets and switches. However, it is able to smooth out the jumps and remove the interference that is generated in the network.

Why do I need a network filter?

Many people ask questions about the network filter: "What is it and what is it intended for?" To do this, you need to familiarize yourself with the theory. The current passing through the house network is variable and is classified as sinusoidal. This name comes from the word "sinusoid", which looks like a wavy line. Voltage in the network, as well as the wave, is constantly decreasing and increasing. Smooth oscillations occur in the range from -300 to +300 volts.

If you look behind the current parameters in the socket, you can see sudden jumps and large voltage amplitudes. All these impulses can make household appliances in the apartment completely unfit for further use. Most often suffer audio centers, televisions and, of course, computers.

How to choose a network filter?

To protect your computer in the house you need to choose a quality network filter. The price of the usual model fluctuates around 100 rubles. However, they can not guarantee a high degree of protection for a personal computer. Jumps in the network sometimes happen quite high, so you need to choose a more powerful network filter. "What is it and how to choose it?" Is a question that interests many people.

The cost of such a device will be unambiguously higher than 100 rubles. When choosing a network filter in the store, you need to familiarize yourself with its parameters specified by the manufacturer on the package. Typically, it refers to the length of the cable, the voltage of the impulse noise, the maximum limiter, as well as the number of available sockets. The cable size must be chosen based on the conditions in which the computer is used. If it is far from the outlet, you should provide this and choose a larger cable. The main thing in this business is to safely hide it. Needless to say, cable damage can lead to a short circuit in the whole house. Also, if something is poured on it, it will cause the system to crash. Considering all of the above, it is better to choose a larger network cable and install it closer to the wall. At the same time, access to it must be limited. With the help of clerical clips the remains of the cable must be collected and fixed together. In this case, it will occupy the minimum space and can be absolutely safe to use. Manufacturers usually produce cables ranging in size from 2 to 5 meters. In most cases, this is enough to connect all devices. The parameter of the impulse noise is in the range from 3500 to 10000 A. The best network filter will have a high index. When buying a network filter, you need to pay attention that its maximum current is not lower than 10 A.

Causes of voltage surges

There are a lot of reasons that, in the long run, lead to sharp undesirable leaps to the network filter. "What is it and how to deal with it?" - a question that interests many. First of all, they are caused by the use of electric receivers. With frequent use of them there are overloads, and the voltage begins to skip. The second most common reason is no longer connected with human activity. This is an atmospheric overvoltage. Unfortunately, the weather makes its own corrections and this has to be taken into account. Additionally, jumps may occur due to failures in the operation of transformer substations. As a rule, short circuits occur in them, which lead to complex processes. All this finds its reflection in the work of the general network of the house.

Fluctuations in the network

The fluctuations in the network are a complex function. It can be represented as a set of sinusoids. Each of them has its own frequency. In the general system, it specifies a specific amplitude, so the sinusoids collectively form a wave. In order for the voltage to be stable, you only need one sinusoid, which has a frequency of 50 hertz. In this case, the amplitude will be at the level of 310 volts. The task in this sense is to eliminate all other sinusoids that affect the network. To do this, they must be suppressed in every possible way and block access to the electric receiver.

Aperiodic interference

There are also aperiodic interferences that affect the voltage in the system. Unlike sinusoid, they are difficult to predict and block. In general, aperiodic interference leads to impulse throws. In the system, they arise and subside in a very short period of time. Many network filters are able to cope with such jumps and suppress them.

How is the mains filter arranged?

Resistors have nothing to do with the type of current that passes through them. However, the inductance is strongly affected by the frequency of the voltage. The whole point is the reactance of the capacitance. When a coil is supplied with a current at a high frequency, its resistance increases continuously. This effect is called inductive and ultimately, it is taken as a basis in the production of network filters. As a result, it is able to cope with sinusoids of small and large periods, which lead to high-frequency interference. For the best effect, use two coils. They equally take on the burden of sinusoids. One coil is in the zero conductor, and the second is in the phase conductor. Depending on the model of the network filter, the inductance can be different. One coil is capable of withstanding from 50 to 200 μH.

Interference of low frequency

Another problem is interference, which is of low frequency. To suppress them, coils are also used, but with an active resistance. In addition, network filters can be equipped with several resistors, which are capable of assuming a significant load. However, it should be borne in mind that the resistance parameters of the resistors should not be at a high level. This is due to the voltage drop in the overall system. When the resistor has a high resistance, the voltage in the network will drop significantly. On average, manufacturers produce them with parameters of 0.5 ohms. The main thing is that this figure does not exceed 1 ohm.

APC Filter P5BV-RS

The network filter for the APC P5BV-RS computer can cope with pulses that can be caused by lightning strikes. Any overvoltage always leads to damage to the computer, and as a result, all information from it will be permanently deleted. The APC P5BV-RS network filter is capable of successfully suppressing small pulses in the network, which ultimately also affect the operation of all devices in the house. The period of successful operation of the computer can be greatly extended if you immediately install a network filter. APC company has long started its development in the field of pulse suppression of different frequencies. To date, it has become possible even to remove interference associated with the telephone network. Computers are a sensitive technique that must be constantly protected from all jumps.

The APC P5BV-RS model has as many as 5 outlets. This is enough to connect the computer together with speakers and a wireless mouse. In addition, you can use the remaining sockets for the copier and printer. The maximum load current is at the limit of 10 A. The frequency of the alternating voltage is 50 Hz. The length of the cord is 2 meters. This is enough to install it in a convenient place and not worry about the safety of using a network filter. In addition, the APC P5BV-RS network filter is equipped with a coaxial line protection. As a result, the filter is capable of coping simultaneously with different jumps. The whole technology lies in the use of the TV antenna. The filter width is 7 cm, and the height is 3.8 cm with a weight of only 0.7 kg. Also, it should be noted that APC provides a long warranty period for its products, which indicates the high quality and reliability.

Filter Defender DFS 501/505

The network filter Defender DFS 501/505 is designed to eliminate jumps in the network. All devices in this series have the ability to suppress low-frequency waves and impulse noise. To eliminate jumps with a high frequency, a gas discharger is provided. For convenience, the network filter has two ports, to which you can connect any gadgets. Without using a computer, you can easily recharge the player. All devices that are connected are not affected by jumps and oscillations due to current protection. Equipped with a network filter Defender DFS 501/505 six sockets. Manufacturers paid special attention to safety, therefore the mains filter housing is made of non-flammable plastic. Plus, it's shock-resistant. Additionally, protection from children is provided. Protective curtains allow even near to young children to safely use a surge protector. The socket, which is located near the switch, is designed only for large adapters

A distinctive feature of this model is a high level of dissipated voltage. In addition, there is a protection against impulse noise. For convenience, there is a special indicator, which indicates the inclusion of the filter, as well as the degree of protection.

Features Defender DFS 501/505

The nominal voltage of the device at 220 V equals 50 Hz. The maximum power it can withstand is more than 2000 watts. The load current is at the level of 10 A, and the energy dissipated is 525 J. This model has three protectable circuits that act as a stabilizer. The network filter operates in the range from 0.16 to 95 MHz. Plus, in addition, there is a fuse, which is installed separately. Its advantage lies in the fact that it is heat-resistant. Also, its work is fully automated, therefore, failures are excluded. The ports in the mains filter are capable of withstanding a voltage of 5 V, and the maximum possible current is allowed at 1000 mA. Additionally for these ports there is a separate protection, which has a restoring effect and can be used many times.

Model Defender ES

Defender ES is the best network filter that can protect your computer from small disruptions. The advantage of this model is its economy. If in a house where household appliances are used, there are rarely power outages, then the Defender ES is a good choice. It is perfect for a computer or a simple kettle. The network filter circuit is made of non-flammable plastic. All contacts are made of copper. The compactness of this model is good. At a voltage of 220 V, the device produces 50 Hz, which is a good indicator. The maximum load that can be used is within 2200 watts. All this is able to greatly protect the computer from short-wave interference.

Features Defender ES

The maximum permissible load is up to 10 A. The energy dissipated does not exceed 120 J. It has only one protective circuit. In addition, there is an automatic fuse, which is securely integrated in the switch. The length of the network filter is from 20 to 30 cm. The cords in the kit are available in various sizes: from 3 to 5 meters. Summing up, you can see certain advantages of this model. Its cost is 150 rubles. However, still advise the filter network voltage Defender ES is not worth it. Ultimately, it is not able to save the computer from all the drops that happen on the network. Since the value of technology is much higher than the cost of a network filter, you should not save on it. It is better to take a reliable network filter of a proven brand and not be afraid of lightning and malfunctions in transformer substations.

Maxxtro PRO PWS 05K-10F

So, we have clarified the question: the network filter - what is it. He is interested in many. The filter specified in this section is also well suited for computers and laptops. This model can block a lot of interference and eliminate most of the impulses. In addition, short-circuit protection is provided. There is an LED indicator. The case is completely shockproof and made of quality plastic that does not burn. It is also possible to install a network filter on the wall in the room. At high loads, when the network filter circuit is burned, the contacts are disconnected and the pulse does not reach the device. For more convenience, there are 5 outlets. The length of the cord is as much as 5 meters. The maximum load current is at a level of 10 A.