Isn t the current sensor capable of measuring AC? Is it okay for me to replace the current transform

A current sensor can be used instead of a transformer, but with an additional power supply. Generally plus or minus 12v

The application of the sensor is not intuitive to give the user a reading. Generally, it has the following characteristics,1Wide range of measurements:

It can measure the current and voltage of any waveform, such as DC, AC, pulse, triangular waveform, etc., and even faithfully reflect the transient peak current and voltage signals;

2.Fast response speed: The fastest response time is only 1us.

3.High measurement accuracy: its measurement accuracy is better than 1%, which is suitable for the measurement of any waveform. The general accuracy of the ordinary transformer is 3% 5%, and it is only suitable for 50Hz sine waveform.

4.Good linearity: better than.

5.Good dynamic performance: fast response time, less than 1us; The response time of ordinary transformers is 10 20ms.

6.Operating frequency bandwidth: Signals in the frequency range of 0 100kHz can be measured.

7.High reliability and long MTBF: 5 10 hours MTBF.

8.Strong overload capacity and large measuring range: 0--- tens of amperes and tens of thousands of amperes.

9.Small size, light weight and easy to install.

Due to the above advantages of Hall current and voltage sensors, it can be widely used in frequency conversion speed control devices, inverter devices, UPS power supplies, inverter welding machines, electrolytic electroplating, CNC machine tools, microcomputer monitoring systems, power grid monitoring systems and various fields that need to isolate and detect current and voltage.

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Sensors such as rheology transmitters can be used.

Can you measure the current of 5000A with a sensor?

The current sensor can measure AC, and the current transformer can be replaced with a sensor. The measurement range of a DC meter is limited, and it is not as good as a sensor with a small or large DC meter.

When the current reaches what size, does the measured current need to be converted with a current transformer?

Generally, if it is more than 50A, it is necessary to use a current transformer, and there is no specific provision. Because the installation of high-current meters and leads is inconvenient and the cost is high, the meter and leads can be reduced by using current transformers. The principle of the current transformer is based on the principle of electromagnetic induction.

A current transformer is made up of a closed core and windings. Its primary side winding turns are very small, stringed in the line of the current that needs to be measured, so it often has all the current of the line flowing through, the number of turns of the secondary side winding is more, connected in series in the measuring instrument and the protection loop, when the current transformer is working, its secondary side loop is always closed, so the impedance of the series coil of the measuring instrument and the protection loop is very small, and the working state of the current transformer is close to short circuit. The current transformer converts the large current on the primary side into a small current on the secondary side for measurement, and the secondary side cannot be opened.

1. The current transformer mainly refers to the use of a coil with an iron core to measure the current of the bus bar and the primary side in the AC situation. She can also measure DC current, and it can be a single core or a double core, and there are generally auxiliary DC windings. This structure is simple, reliable, and slow.

The process and design of the current transformer are complex, with a general accuracy of 5%, which is difficult to achieve, and the phase problem is large, and the compensation is also difficult.

2. The current sensor is a generalized local concept, which now generally refers to the secondary instrument, and specifically refers to the field of semiconductors and microelectronics, such as Hall sensors and optical fiber sensors. Semiconductor current sensors are easy-to-use commodities with fast response, easy compensation and correction, and an accuracy of 1/1000.

Whether it is a current transformer or a voltage transformer, the principle is the same as that of a transformer.

The difference is: the secondary current of the current transformer is the secondary current proportional to the primary current, and its voltage is very low; The secondary voltage of the voltage transformer is the secondary voltage that is proportional to the primary voltage, and its current is very small.

Therefore, current transformers are used to supply a current signal proportional to the protection and measurement, while voltage transformers are used to supply a voltage signal proportional to the protection and measurement.

1. The transformer has three functions: change the voltage; , change the current; , change the impedance. Zen cave current transformer is to change the usage of current:

When the secondary winding is short-circuited, the magnetic field strength generated is the same as that generated by the primary winding, but the direction is opposite and cancels each other, and the current generated by the secondary winding is the product of the number of turns (ampere turns) is the same as the number of turns in the primary winding, so the current ratio of the current transformer is the inverse ratio of the number of turns.

2. Since the current ratio of the current transformer is inversely proportional to the number of turns, the current can be reduced proportionally, which is convenient for metering and protection. The current transformer used in common high-current metering is this original method: the current intensity is reduced according to the ratio of turns, and then the measurement result is multiplied by the reduced current multiple, which is the actual electricity consumption.

What are the similarities between voltage transformers and current transformers? Today I know it.

The current sensor can be detected by AC and DC, AC and DC can be measured, and an external power supply is required.

The current transformer can only measure AC, and when the output signal is AC 5A or AC1A, no external power supply is required.

It's easy to judge, I'm specialized in doing these, and I have any questions.

A current sensor is a sensor that senses the measured current and converts it into a usable output signal, which can be any physical quantity as required. A current transformer turns a large current into a transformer with a small current. The former can protect the power supply and electrical equipment, while the latter only measures large currents for the purpose of measuring large currents, which is very different.

The current transformer is a transformer principle, so it is only suitable for alternating current, not direct current. Current sensors detect currents in a variety of AC and DC circuits.

The current transformer is a passive device, and the current sensor is an active device.

The current transformer cannot be detected together, and the current sensor can be detected by both AC and DC.

The current transformer has no circuit, only relies on coil feedback, and the current sensor contains an amplification circuit inside.

A current transformer is a type of current sensor, which generally refers to a device that uses the principle of electromagnetic induction to change the current value.

Current transformers are commonly used for power frequency sine wave testing.

A current sensor is used to turn a current signal into a voltage and current signal that is easily accepted by electronic circuits. Sensors for AC and DC current testing are included.

Due to habit, there are also current sensors that are not based on electromagnetic induction principles and are called current transformers.

A current transformer is an electrical component that turns a large current into a small current. Without changing its frequency, only changing its size, its secondary side current is 5A, that is, the output rated current is 5A. Used for electrical control, measurement, protection, signaling, etc.

A current sensor is an electrical component that converts AC into DC or DC into DC. The output current is DC 4 20mA and is an analog quantity.

What are the similarities between voltage transformers and current transformers? Today I know it.

The current transformer can convert the current with a large value into a secondary current with a small value through a certain transformation ratio, which is used for protection, measurement and other purposes, using the principle of electromagnetic induction. The current sensor is a kind of detection device, which can feel the information of the measured current, and can transform the information that is detected into an electrical signal or other required form of information output that meets the needs of a certain standard according to a certain law, so as to meet the requirements of information transmission, processing, storage, display, recording and control.

What are the similarities between voltage transformers and current transformers? Today I know it.

The gy-standard current transformer is used to verify the current of the accurate level two or less than two levels lower than it, it is composed of primary winding and secondary winding, and its principle is shown in Figure 2. When wiring, strictly refer to the current ratio given by the wiring card. L1 and K1 are the polar ends of the primary and secondary windings respectively, and LA is the polar end when the center needs to be pierced.

Conditions of use: 1. Ambient temperature: -5 +40°C;

2. Relative display: <80%;

3. There should be no strong external electromagnetic field in the workplace that is not related to work;

4. It is allowed to work for a long time under the rated current.

Precautions: 1. When verifying the current transformer, the current ratio of the standard current transformer and the tested current transformer must be the same;

2. Strictly follow the wiring of the line given in the figure;

3. Before verifying the transformer, it is necessary to test whether the load box is accurate;

4. During the verification process, it is strictly forbidden to open the secondary winding.

Temperature: 5-40

Humidity: 80

Capacity: 5VA

Power factor: cos =

It is allowed to work for a long time at the rated current, and the core is pierced above 150A Weight: 20

Standard current ratio.

Dimensions: 280mm 60mm 60mm

It is not possible to measure voltage, it converts a large current on the primary side into a small current on the secondary side. By measuring the voltage on the secondary side, the saturation of the core can be seen and thus the performance of the current transformer can be determined.

can measure a variety of voltages and currents. (2) Make the specifications of instruments and relays unified.

1. Easy to standardize and mass production. (3) The use of transformer as a primary circuit and a secondary circuit.

This is because the primary resistance of the current transformer is so small that it is almost negligible.

When measuring the voltage with a current transformer, one resistance r is measured in series at a time, and the primary side current is ignored due to the ignorance of the primary resistance

i=u r, the primary current is proportional to the voltage, thus, the secondary current is proportional to the primary voltage.

The current transformer used to measure the voltage is generally a transformer with a small primary rated current.

Transformer includes current transformer and voltage transformer.

The current transformer is connected in series with the circuit under test (there is also a heart-piercing transformer, which is to directly pass the tested fluid through the aperture of the transformer), and the voltage transformer is connected in parallel with the circuit under test.

Current transformer series method:

It is to cut off the circuit, and then connect the two ends of the primary side of the transformer at both ends of the truncated line, note that the second must be connected to the instrument or directly short-circuit (not measured), in short, no open circuit.

Voltage transformer parallel connection method:

The transformer is connected to the live wire at one end at one end and the zero wire at the other end, and the secondary side should not be short-circuited.

In your diagram, the transformer is connected in series (or through the center), and the current flowing through the primary side is determined by the load, as you say, "I decide at will". However, the primary side is determined, and the secondary side is proportional to the current on the primary side. In the diagram, the secondary current is converted to voltage by integrating the integrator.

It's just that your circuit is wrong, because the transformer can only measure the AC current, connect according to the diagram, and the secondary output AC current passes through the integrator, and the output voltage is zero.

From your language, it can be seen that your level is now in a vague state, and you still need to learn hard, and it is already an entry. It's very close to success. The actual size of the current should be tested by the ammeter, and the resistance of the circuit should be adjusted so that the current measured by the ammeter is the same as your actual display.

The primary current is displayed in proportion. It should be said that it makes sense.