电表工作原理与电表操作技术

电表工作原理与电表操作技术 The working principle of watt hour meter Meter technician contact Tencent Penguin alpha alpha 13 7 20122 and 1; 18 and 64 mobile phones, the 58 to 8. We know that the meter is the eddy current and alternating magnetic flux generated in the aluminum plate using the voltage and current of coil and the interaction of electromagnetic force, the aluminum plate rotation, while the introduction of brake torque, speed and load power that aluminum plate is proportional to the axial gear, the meter product to calculate the rotary speed measured without electricity. Therefore, the main structure of the meter is composed of a voltage coil, a current coil, a turntable, a rotating shaft, a brake magnet, a gear, a meter, etc.. Single phase meters are generally civilian, followed by 220V equipment The home circuit is used to power all kinds of household appliances Home circuit such as and connection The family circuit into the family line, electric energy meter, electric switch, insurance device and so on. All kinds of electrical appliances in the home circuit can not affect the use of other electrical appliances, so the household appliances are connected in parallel (1) entry line; Into the family line poles, one of them is a FireWire, zero line, zero line circuit in the general family is grounded, so the zero line and the earth (ground) does not exist between the voltage; but there is a 220V voltage between the front line and zero line current, just for a moment by the fire through the zero line of electric appliances while the current flow, and the zero line through the use of electrical appliances into the fire, so at a certain frequency change, we use the family electric circuit is alternating current. In order to ensure that does not affect the other appliances work an electrical failure, all appliances should be connected with one end of the line, the other end is connected to the zero line, which is parallel between these appliances, a branch failure of other branches can still work, so the lamp is broken, and will not affect other TV work electrical appliances. (2) electric energy meter Electrical energy represents a device used to measure how much electricity a user consumes in a certain amount of time The electric energy meter should be installed in the home circuit line. Can the meter be mounted between "E" and "F" in Figure 1? What does "220V" and "10A" mean on an electric meter? What does that mean? What does the word "1500r / kWh" mean on the meter? Nameplate of electric energy meter The electric energy meter is marked with "220V, 10A", which means that the rated voltage is 220V, the rated current is 10A, and it can be used in the home circuit with the maximum power of 220V * 10A = 2 200W The word "1500r / kWh" on the meter indicates the consumption of electricity per kilowatt hour, and the meter turns 1500 revolutions (3) Fuse is now increasing in living standards, more and more people have the ability to buy all kinds of electrical appliances, but can we increase the unlimited number of household appliances? Analysis: because all the appliances are parallel, the more electrical appliances used at the same time, roads (i.e. fire into households and the zero line) on the current more. But there is a certain specification into the family line, only allow a value below the current, if the current exceeds this value, it will make the wire overheating, likely to cause a fire, causing the risk of life and property. The two were on the fuse in the firing line and the zero line, You can over into the family line in the current allowable value, the automatic fuse fuse, cut off the current trunk, so that all the electrical appliances to stop working, to avoid the occurrence of fire, and remind the user: do you currently use at the same time too many electrical appliances, therefore, we must pay attention to the use of electrical appliances allow the value of the current trunk, cannot limit at the same time increase the number of working appliances. How does a fuse protect the circuit? Analysis: lead antimony alloy fuse is relatively large, relatively low melting point made by resistivity. When the line current is too large, the fuse heat quickly, the temperature rises rapidly, reaching the melting point, fuse, roads become branch circuit, all appliances will stop working. Therefore, under normal power supply, all appliances in the home work at the same time, often means that the fuse is blown Some users for their own electricity is convenient, without permission will be changed into thick fuse (allowing by current) or simply change wire or copper wire, so that the use of high-power electrical appliances, the fuse will not be broken. But the consequences are extremely dangerous, this was the case in the current distributor; to the firing line and the zero line to become the two dragons, and along each branch spread, and the fuse is safe and sound, don't cut off the power, to play the role of insurance. (4) socket grounding; Since all electrical appliances are connected in parallel between the line of fire and the zero line, how can we connect the electrical appliances in parallel? In our room on the walls often have power jack socket. This is a piece of metal in each hole socket, if Jack is two holes, then the metal sheet is one of the holes in sheet metal connecting wire, another hole in the even zero line. When the appliance plug inserted into the socket. Metal plate and socket and plug contact electrical electricity. For the socket hole, "2" "3" hole is connected with the live wire, the zero line, "1 hole" ground, why such a socket? Washing machine, water dispensers and other electrical appliances in our homes and housing was fire insulation, but if the destruction of the insulation shell after a considerable period of time, it is connected with a fire wire, people standing on the ground, there will be one voltage and case, this one will touch shell shock. If the electrical enclosure and is connected to the ground, people with the shell without voltage safety. Because of the above reasons, this is the three electrical plug, electrical enclosure at the top of the foot, the foot is inserted into the socket hole "1", then connected with shell ground. If multiple appliances have to use the same socket, they must use the socket board, which can solve the problem of power consumption of many appliances Requirement is clear: when this word shows that the user can use electricity 1 degrees, the turntable of this energy meter will turn 1500 turns In the case that an electric appliance works alone for 30 minutes, the turntable of the meter turns 500 turns. How much is the power of the electric appliance? Can you design a scheme for measuring the rated power of an unknown power appliance according to this problem? What data should be measured? (6) test. In the home circuit between the zero line and FireWire. We can use the test pencil to finish the work: A metal nib, high resistance, a neon tube and a pen tail metal body are connected together. Use the test pencil: In the test pencil, hold the pen tail metal body with the hand, the nib contact into the family line, if the encounter is FireWire, neon light. This is because there is a voltage between the line and the station of the earth, and the resistance ratio of resistance and resistance of human body neon much, so most of the voltage to the the high resistance and neon, neon light. If the nib contact is the zero line, neon will not shine. The test pencil is divided into high voltage and low voltage test pencil test pencil, generally above one thousand volts voltages high voltage circuit of our family belongs to the low voltage. Do not use low voltage test pencil to measure pressure line, because the voltage at the human body according to the proportion of share more than the body can bear safety voltage.