Description:
1-This is a common electrical circuit products,2- lightning protection measures are triage.
Shunt
Shunt is based on DC current through the resistor voltage generatedat both ends of the principle of resistance is made.
Shunt is widely used to expand the scope of measuring currentmeter, there is a fixed valuation and precision alloy shuntresistors, can be used in communications systems, electronicmachine, automatic control circuit for limiting power supply, etc.,are current sampling test.
For DC current measurement shunt has a slot-type and non-slot type.Shunt resistors are manganese nickel-copper alloy rods and copperbelt, and is plated with nickel. Rated voltage drop is 60mV, but itcan also be used as 75, 100, 120, 150, and 300 mV.
Slot-type shunt current ratings are the following: 5 A, 10 A, 15 A,20 A and 25 A
The non-slot-type shunt rated currents from 30 A to 15 kA are thestandard separation.
Shunt used to measure the DC current;
Shunt resistor actually is a very small resistance, when there aredirect current flows out of date, resulting in pressure drop forthe DC ammeter display;
DC ammeter voltmeter is actually, full scale value 75mV;
DC ammeter and shunt, the ancillary use;
For example: 100A ammeter shunt matching of 0.00075 Europe;
Namely, 100A * 0.00075 Europe = 75mV;
50A ammeter shunt supporting Europe as 0.0015;
50A * 0.0015 Europe = 75mV.
To measure a large DC current, such as the tens of amps, evengreater, hundreds of amps, we do not then the process a largenumber of ammeter for current measurement, how should I do? Thiscan be done using the shunt. Shunts is a can be high-currentprecision resistor, when the current flows through the shunt whenit appears the two ends of a mV-level voltage, so we use themillivolt voltage meter to measure the voltage, then this voltageis converted into electricity. on the completed a high-currentmeasurements.
Ammeter There are many different specifications, but the actualheader is a standard millivolt voltage meter. Example, is afull-scale voltage of 75mv table. So with this piece of voltmetermeasurements such as 20A current, you need to give it with a 20Acurrent flow when the voltage drop generated 75mv shunt resistor,also known as 75mv shunt.
Shunt is a significant current through the resistance of commonlyused 15A or 20A and 35A of the need to shunt ammeter. Shuntimpedance = header logo full-scale voltage / current full scaleheader. For example 20A of the ammeter shunt device resistance =75mv * 10-3/20A = 0.00375Ω, impedance according to Ohm''s law afterconstant U = IR, current and voltage is proportional to. currentlinear voltage was linear. so we can use a full degree of 75mvtable shows the current-voltage current. Therefore, we are using isactually a voltmeter ammeter.
AC current measurement of how it? Using current transformer, thehigh current in a certain variable less than 5 amps into a smallcurrent, so with a small-scale exchanges of high-current ammetercan be measured. Is measured by the current but also thattransformation ratio.
Is a short conductor, can be a variety of metal or alloy, and alsoconnecting terminals; its DC resistance is strictly a good tone;series with the DC circuit, the DC-current shunt, shunt produces mVat both ends DC voltage signal, so that, and then both ends of themeasurement of the shunt table pointer swing, the reading is thatthe DC circuit of the current value. The so-called diversion, thatis, a small sub-current to drive the table instructions, the smallcurrent (mA) with large loop where the current (1A-tens of A) theproportion of the smaller linear ammeter reading the instructionsthe better and more accurate .
This is a common electrical circuit products, lightning protectionmeasures are triage.
