14 items of electricity

Author:　News Source:　Click：　Update Time：2007-09-07

Sound Power 14 Q

 

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Question 1: Why is sound switched on, the lights will flash a little?
A: This is because the audio equipment is switched on, due to equipment within the bulk capacitor in the load before shutting down the discharge state, press the power switch, the capacitor immediately draw power from the transformer, due to the current drawn is very large (referred to as charge current), resulting in a sudden drop in power, fluorescent lights will naturally dark about the whole thing.
After the general level as long as the sum of filter capacitance than 20,000 μf, this phenomenon occurs at boot time. Therefore, part of the well-designed high-power amplifier in the boot with a "buffer circuits," that boot will go through a large cement resistor buffer, so that gradually the internal capacitance charging, after a period of time (about a few seconds) longer relay connected, so both will not be immediately blown fuse protection, but also avoid the lights flash about troubles.

Question 2: Taiwan Power Company's power supply Henlan really do?
A: When you experience a power instability, the total responsibility of just-Guaidao Taipower should first talk. If you know the person Taipower, it must be vigorously defended, and made a reasonable explanation. In fact, the Taiwan Power Company's power supply problem that does not, the power instability phenomenon, the process of disruption of distribution comes.
Speaking of a good start with power plants, and is currently the major power plants in Taiwan, bent into two categories, one is nuclear power generation, and the other is a thermal power plant. Either nuclear power or thermal power, they are using the power of steam to drive steam turbine driven generator. This is a very sophisticated power generation equipment, turbine speed related to the frequency stability, large-scale between the generator and turbine with a computer-controlled transmission system to ensure a variety of loads to maintain a stable output frequency (60hz). Furthermore, the turbine generator output voltage is absolutely stable sine wave voltage, which is the basic physical principle, in other words, to create a sine wave skew problem then there is! Therefore, the power sent from the Taiwan Power Company is absolutely stable 60hz sine wave power. As for the interference and voltage instability problems, see the next question.

Question 3: Why did the electric transmission, always use the high-voltage, which is not dangerous?
Answer: when the voltage exceeds 100v, there is a risk, but why Taipower distribution of the total electricity in the 22kv above? This is not dangerous?
Of course dangerous, so eye-catching high-voltage tower is always hanging signs, warning idler should not get near, or prone to risk of electric shock. The use of high-voltage transmission, mainly in order to save when the cable wiring with copper content, while also reducing power loss during transmission, so the electricity is sent from the power plant means of transmitting ultra-high pressure. EHV transmission biggest advantage is that voltage is high, current, flow of electrons through conductors when the heat is based on the proportion of current rather than voltage, and therefore did effectively reduce the amount of current a conductor can reduce the wear and tear, so although dangerous, but as long as proper precautionary measures, to prevent accidents from taking place. Another reason for high pressure transmission was to reduce the voltage rate of change in the client. If a 1:1 transmission, that is 110v power Taipower sent directly to the family, Taipower to reduce 1v each voltage, the client will follow the voltage drop 1v. However, if the current widespread use of the 22kv transmission, when the plant voltage 1v sent a shock when the client almost no sense.

Question 4: Why does my family of voltage is often unstable?
A: The voltage instability situation often occurs in a variety of household electricity, especially near industrial areas. When the building application with Taiwan Power Company took over the line, will follow the application form number, with appropriate power to the next building, but this is only an estimate, if the household electricity consumption of electricity capacity over the original application, then the easily lead to voltage drops and other electric power shortage. This is not the Taiwan Power Company does not give you enough power, but the user should make greater use of electricity applications. For example, the original application for an industrial park with 10,000 kilowatts of electricity, Taiwan Power Company in accordance with the application of course, with access 10,000 kilowatts of electricity supply, if the industrial park's electricity consumption than the rated load, the power of course, the phenomenon of tight occur, the voltage will naturally be inadequate use has declined. Light oral Mama did not use, if you make more electricity to Taipower applications, power shortage situation is easy to solve. So next time when the power down, please do not curse at every turn, quickly measure their power consumption to see whether it exceeds the rated power supply on the electricity contract? If a long period of low-voltage state (such as the voltage drops below 100v), can also respond to the Taiwan Power Company, they will send the user to change the transformer taps, so that your voltage back to normal.

Question 5: general household use of electricity supply to?
A: The household electricity and industrial electricity consumption is different from not only different forms of electricity supply, electricity capacity is also different. The average family no large-scale electrical equipment, electrical equipment, at most, the most power-hungry air-conditioners or electric heaters, these devices use a voltage no more than 220v, it is generally more than for the B household electricity consumption, 110v single-phase three-wire supply. How can I tell? Take a look at his meter is not round? If it is, it's a single-phase three-wire for the 110v supply, if it is a square meter, this is the most common single-phase two-110v supply.
Single-phase three-wire with two FireWire and a water line, two FireWire are mutually inverting 110v/60hz, properly connected, you can pull out two separate stocks 100v or 220v electrical wiring Yi Gu, including the use of 110v electrical supply to the general , while the 220v provides the use of air-conditioners and electric water heaters. The use of single-phase three-wire power supply reasons, the most important is the power transmission process in order to save wear and tear. Through the appropriate wiring, from the two pull out two FireWire unit 100v wire, if the volume on both sides of electricity and so on, then the phase offset in accordance with the principle, the waterline will not have any current, which indicated that they could reduce the diameter waterline , but also avoid unnecessary power loss. In other words, if you are at home to maintain a fixed power consumption, at best, wiring combinations, as well as the opportunity to save energy degrees.

Question 6: Where is the power interference come from?
A: You have just said, Taipower sent electricity for the perfect 60hz sine wave, but the interference come from? In fact, the most important source of interference will still come from households in their own electricity. Try to think of housekeeping in the number of electrical appliances? When these electrical appliances plugged all the plugs to use, it will produce much interference? Air conditioners, electric fans, fluorescent lights and so on, none of them are purely resistive load, they have also have capacitance reactance, as long as it will open a feedback interference with the power system, power supply noise, parasitic. Sound will be heard when you open fluorescent "pops" the sound, which is fluorescent interference.
, Even if you are tried to stay out, listen to audio when you try not to open other appliances to use, can not guarantee a certain power clean, because the front of your home and meter is still connected to other power consumers, others as long as the use of electrical appliances at home equipment, would also interfere with you, extent depends on the situation. Good luck, those who do not feel bad luck who sigh useless, unless you own the user to apply a transformer to use.

Question 7: How do I avoid interference?
A: This is everyone's concerns, how to avoid interference? The most direct and effective way to segregation. You isolate the interference of others, isolated in their own homes electrical interference between them. Large-scale electrical equipment, and computer the most prone to interference, they will produce high-frequency noise, also have the power harmonics, parasitic in the power system interfere with other electrical appliances. If you want access to clean electricity, the use of isolation transformers or power filter is a good way to use the principle of insufficient bandwidth transformer, filter high-frequency noise, only allow lower frequency 60hz power through, so you can effectively filter out high-frequency noise or high frequency power supply harmonics. But the isolation transformer is not a panacea, see the next question will know.

Question 8: Power Filter useful?
A: I am also concerned about this issue than you, if there are too many factors at home can not be overcome interference, commercially available power supply filter useful? First talk about the power filter works. Briefly put, the power filter materials used mostly inductors, capacitors and other materials, capacitance and inductance will be assembled into a "low-pass filter", only allow 60hz or so (or less) by the frequency, you can block more than 60hz signal (or noise), and thus achieve the purpose of filtering noise.
Power Filter There are several, and some have attached regulator, it also has the ability to automatically adjust the output voltage using the transformer tap in different combinations to detect the circuit with the relay to connect the different tap, you can achieve real-time the purpose of adjusting the output voltage, the majority of computers are used for this regulator works. But please do not forget that relays instant connection tap will generate surges, which is another kind of power supply interference. Also, the low-pass filter characteristics, that is, higher frequency signals through the block, if the amplifier power supply requirements for the speed of large power supply capacity of low-pass filter, it will form a bottleneck, but an impediment. For example: certain power supply filter for filtering noise of more than 60hz is very effective, but if the amount of current drawn at this time amplifier power supply capacity greater than filter or expand the machine needs to be too fast than the supply rate of 60hz, power supply filter has become the stumbling block.
In general, power filters for power stability, and power consumption of smaller equipment, such as hearing the source, the former level and so on, but after the power level and low tones, directly plugged into the wall better. In any case, do not think there is the positive effect of adding power filter, try it the most important.

Question 9: How to prepare a good sound of power?
A: do your build a power plant? Of course not, but be prepared to set the ideal power supply is no longer being perceived difficulties, as long as it pulled a separate power cord to solve the problem of most of the rest, they can still rely on the power cord and the appropriate actions to fine-tune the small props . Pull the power cord on the way, please refer to the previous period, as well as the current text of the topic, especially in this period, Mr. Cao home power handling, can be said that an ideal implementation, if you really wants to, it may be planning and design. You may not have such good luck to the sole use of a "pole transformer", directly from the Taiwan Power Company to clean power, but if you live in an apartment building, at least they can pull from the meter at one or more of at least 22mm square the use of the power cord to the sound, so to speak, on the dedication of the. Believe it or not, to spend 8000 yuan facelift an independent power supply line, more than 80,000 yuan for a power cord there is actual effect. Also, when you pull one go, be sure to pull more than 22mm square, the two are tired of the grind to do, please do not believe that water and electricity, said the owner of 3.5mm square enough to use.

Question 10: News source equipment and post-class do need to be dealt with separately?
A: The best is to be dealt with separately, the best way is to pull two power lines, a hearing to consume less power source equipment, such as the use of the former class, the other one is to consume a larger power amplifier power, ultra-low sound such use, although the source of the power cord is the same one, but still heard to good effect. As for the need to pull the power cord does not require power supply filter, please give it a try on their own, usually my experience is: as long as there is adequate power supply, filter does not necessarily have a positive effect.

Question 11: Do they need grounding line?
A: Because the Taiwan Power Company's power supply form and there is no real ground to the users, so users must prepare their own ground. Grounding-line approach and the principle, please refer to the text of the topic shows that Mr. Cao's home ground, even though the can not be regarded as the most perfect, but for audio fans, enough of fever, then what good or not then? Experiment must also be learned, so Mr. Cao has also designed a grounding switch for this to test what is good.
Most of the use of advanced audio equipment, three-hole ac power cord, one of which is the grounding line, this ground and chassis connections, after conduction through the wires directly to the earth (earth) connection. Ground after the biggest benefits are: hand to expand the machine chassis surface, there will be no sense of Ma Ma, which means the chassis-to-ground voltage is very low, low-to-no sense of power. From the perspective of security, grounding is necessary, but from the sound point of view, what is good and none dared to promise.

Question 12: How an ordinary family ground wire?
A: Actually, Taipower sent single-phase three-wire power line which, one of which had been grounded, but because there is current through the combined path is too long, so much the existence of voltage, the voltage of electricity because of the situation changed, with the lift. I am at home in order to ac meter measurements, the minimum is about 1v, a maximum when 6v. If we use this water line grounding, you can also reach ground effect, but is best to install an ac voltage meter, ac voltage is observed at any time. But the safety point of view, is still not recommended. Connecting pipes or steel buildings in a way to connect is not recommended, because it easy to import other interference, such as lightning, or other electrical leakage, we also easily transmitted to the ground by audio equipment.

Question 13: Ground will be able to do to avoid interference?
A: The answer is not absolutely sure, if you have not received a thorough grounding, not careful, it will bring harm to others, where the noise into audio equipment. The purpose of grounding can be roughly divided into two categories, one is safe electrical grounding considerations, one is the signal ground. The former is usually used for large-scale machinery, such as washing machines, motors and so on, when the resulting leakage phenomenon, can be ground by the conduction of electricity conduction to the earth, in order to protect the safety of personnel. The latter was to upgrade equipment or instrument signal to noise ratio, a circuit ground to reduce noise.
Grounding the equipment connected to the building steel or metal water pipes, can not guarantee that other people also so grounded, if the audio equipment with other people's washing machines share the same ground, the result would be even worse will not be changed for the better, so not recommended audio equipment to connect the way the building steel or water pipes, it is very unhealthy. In addition, the ground will not only conductive, it would bring noise, ground sharing with others, nothing starts, something happens will have to import other people's noise, sound system, this time would rather not grounded.

Question 14: Cable lines need to shock do?
A: The heavy cable lines can in fact be considered as a part of audio power line, since the audio power line should pay attention to materials and shock absorber, cable line also should pay attention to this phenomenon. Taiwan Power Company's distribution by, due to very long length of transmission cable, cable poles with the wind swinging with each other because of mutual induction will be between the cable and produces low-frequency vibration; if two parallel transfer cable, but also mutual capacitance effects will be produced, but instead condenser microphone, these phenomena although not from the speakers in the spread, but the Taiwan Power and Distribution listening devices inside the Kam has heard very clear. To achieve the best cables passing through the path, the contact points can be foam-coated, two cable try not parallel, so that the noise can be reduced even lower.

Conclusion:
With regard to power a wide range of issues involved, individual naturally has its own unique interpretation and argument, but basically, the power supply should maintain an adequate electric power, voltage stability, low noise, parasitic management principles, methods in countless, processing power equipment is also everywhere, as long as they meet these principles, the right hi-fi have a positive help.
Recently went to an audiophile sound pleasant to the ear at home, he attaches great importance to power issues, all the audio equipment used commercially available power supply filter processing, the attempt to create the cleanest power supply to the audio equipment to use. Result was that I brought a very harsh fever tablets to test, even was found that dynamic, as well as fragments of very low frequency appear to expand the machine down even faster than light even out of the dark, it is clear that this is due to large current when the output due to insufficient power supply, resulting device voltage drop, the equipment itself, the power did not feed, no matter how many filters have effect? It was just a bottleneck is to increase the power supply only. The audiophile later based on my recommendations, through the installation of two 38mm squared cable, since then no matter how much volume is turned up, lights flash does not flash look, this is from the fundamentals to solve the power problem.