| Band width | 0.05 to 60 Hz |
| Number of windings | 4 to 60 Windungen |
| Load power | 900 to 2,500 VA |
Current sensors
Current sensors, also called – among other things – current transformers, are used for indirectly and contactlessly measuring current. Hall effect current transformers are common among this type of sensor.
Hall effect current transformer
A Hall sensor also delivers a signal if the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC. For sensors that measure the magnetic field, a distinction is made between open loop (open-loop current transformer) and closed loop (compensation converters, also called zero flow converters).
Closed-loop current transducers can measure AC / DC and mixed currents. This type of current transformer has a second secondary winding for the output. This converter delivers a current at the output. By using a measuring resistor in series with the secondary coil, the voltage that is proportional to the current can also be measured through this resistor. The benefits of closed-loop current transformers include, among other things, high accuracy, a higher bandwidth, low temperature drift, good linearity and a relative insensitivity against overcurrents.
Open-loop current transformers
In contrast to closed-loop current transformers, open-loop current transformers generally deliver an output voltage proportional to the increased Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison.
Magneto-resistive current transformers (MR)
The current is passed through the sensor or the sensor is placed on the PCB track for the current measurement. Advantages of the magneto-resistive current sensors include, among others, the compact design, low power consumption and the relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings with the used magnets. Application reports on the subject of current transformers
In diribo under Application Reports, you can find application reports prepared by suppliers on sensor category “Current sensors”. It is also possible to enter search terms here. Application reports related to a given topic can thereby be found. ... Read more
Hall effect current transformer
A Hall sensor also delivers a signal if the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC. For sensors that measure the magnetic field, a distinction is made between open loop (open-loop current transformer) and closed loop (compensation converters, also called zero flow converters).
Closed-loop current transducers can measure AC / DC and mixed currents. This type of current transformer has a second secondary winding for the output. This converter delivers a current at the output. By using a measuring resistor in series with the secondary coil, the voltage that is proportional to the current can also be measured through this resistor. The benefits of closed-loop current transformers include, among other things, high accuracy, a higher bandwidth, low temperature drift, good linearity and a relative insensitivity against overcurrents.
Open-loop current transformers
In contrast to closed-loop current transformers, open-loop current transformers generally deliver an output voltage proportional to the increased Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison.
Magneto-resistive current transformers (MR)
The current is passed through the sensor or the sensor is placed on the PCB track for the current measurement. Advantages of the magneto-resistive current sensors include, among others, the compact design, low power consumption and the relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings with the used magnets. Application reports on the subject of current transformers
In diribo under Application Reports, you can find application reports prepared by suppliers on sensor category “Current sensors”. It is also possible to enter search terms here. Application reports related to a given topic can thereby be found. ... Read more
461 - 480 / 481
| Band width | 0.05 to 60 Hz |
| Number of windings | 4 to 240 Windungen |
| Load power | 900 to 2,500 VA |
| Band width | 120 to 350 kHz |
| Primary nominal current | 0 to 100 A |
| Accuracy (error) (±) | 1 % |
| Band width | 10 to 50 Hz |
| Number of windings | 4 to 3,000 Windungen |
| Primary nominal current | 0.1 to 100 A |
| Band width | 0.05 to 60 Hz |
| Number of windings | 4 to 120 Windungen |
| Primary nominal current | 0 to 600 A |
| Band width | 10 to 50 Hz |
| Number of windings | 4 to 3,000 Windungen |
| Primary nominal current | 0.1 to 50 A |
| Band width | 0.05 to 60 Hz |
| Number of windings | 4 to 200 Windungen |
| Primary nominal current | 0 to 200 A |
| Band width | 0.05 to 60 Hz |
| Number of windings | 4 to 60 Windungen |
| Primary nominal current | 0 to 300 A |
| Band width | 0.05 to 60 Hz |
| Number of windings | 4 to 80 Windungen |
| Primary nominal current | 0 to 400 A |
| Band width | 10 to 50 Hz |
| Number of windings | 4 to 6,000 Windungen |
| Primary nominal current | 0.1 to 400 A |
| Band width | 10 to 50 Hz |
| Number of windings | 4 to 9,000 Windungen |
| Primary nominal current | 0.1 to 600 A |
| Band width | 0.05 to 60 Hz |
| Number of windings | 4 to 100 Windungen |
| Primary nominal current | 0 to 100 A |
| Band width | 10 to 50 Hz |
| Number of windings | 4 to 3,000 Windungen |
| Primary nominal current | 0.1 to 200 A |
| Band width | 10 to 50 Hz |
| Number of windings | 4 to 3,000 Windungen |
| Primary nominal current | 0.01 to 5 A |
| Applications | Energy |
| Primary nominal current | -50 to 50 A |
| Accuracy (error) (±) | 1.5 % |
| Detected current type | Direct current (DC) Alternating current (AC) Pulse currents |
| Band width | 10 Hz |
| Number of windings | 4 to 400 Windungen |
| Load power | 900 to 2,500 VA |
| Band width | 10 Hz |
| Number of windings | 4 to 200 Windungen |
| Load power | 900 to 2,500 VA |
| Band width | 200 kHz |
| Primary nominal current | -60 to 60 A |
| Accuracy (error) (±) | 0.2 % |
| Band width | 200 kHz |
| Primary nominal current | -45 to 45 A |
| Accuracy (error) (±) | 0.2 % |
| Band width | 200 kHz |
| Primary nominal current | -60 to 60 A |
| Accuracy (error) (±) | 0.1 % |
Hall effect current transformer
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
Hall effect current transformer
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
Hall effect current transformer
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
Hall effect current transformer
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
Hall effect current transformer
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
Hall effect current transformer
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
Hall effect current transformer
A Hall sensor also provides a signal when the magnetic field surrounding it is constant. The Hall effect current transformer can measure both AC and DC current. A distinction is made for sensors that measure the magnetic field between open-loop (direct-imaging current transformer) and closed-loop (compensation current transformer, also called zero-flux transformer).
Closed-loop transformers can measure AC/DC and mixed currents. This type of current transformer has a second secondary winding for the output. At the output, this converter supplies a current. By using a measuring resistor in series with the secondary coil, the voltage proportional to the current can also be measured across this resistor. The advantages of closed-loop current transformers include high accuracy, higher bandwidth, low temperature drift, good linearity, and relative insensitivity to overcurrents.
Open-loop current transducer
Unlike the closed-loop transducer, the open-loop current transducer usually provides an output voltage proportional to the amplified Hall sensor voltage. The bandwidth is lower and the temperature drift is higher in comparison. Open-loop transformers can withstand short-time higher overcurrents without damage. However, this can lead to an increased magnetic offset.
Magnetoresistive current transducers (MR)
The current is passed through the sensor or the sensor is placed over the trace for current measurement. Advantages of magnetoresistive current sensors include compact design, low power consumption, and relatively high Gauss sensitivity. This higher sensitivity allows the use of smaller magnets and thus cost savings on the magnets used.
The following parameters, among others, must be considered when selecting a current transformer:
* Current type, AC or DC
* Input current
* Output signal of the current transformer
* Measurement accuracy
* Frequency
* Insulation values
* Ambient temperature
What is a current transformer and what is it used for?
A current transformer is a device that converts the current in an electrical system into a different current. It is used to measure or monitor the current in a circuit without disturbing the electrical system.
A current transformer consists of a primary winding, which absorbs the current in the system, and a secondary winding, which converts the current into a proportional value. The primary current is normally conducted through a thick cable, while the secondary current flows through a thinner cable.
Current transformers are frequently used in electrical networks, power distribution systems and industrial plants. They make it possible to measure or monitor the current in a system without the need for a large current to flow directly through a measuring device. This improves safety and reduces the likelihood of damage to the meter.
In addition, current transformers enable the monitoring of power consumption, the measurement of power factors and the detection of residual currents in electrical systems. They are also installed in transformers and switch cabinets to monitor the current and trigger protective circuits if necessary.
A current transformer consists of a primary winding, which absorbs the current in the system, and a secondary winding, which converts the current into a proportional value. The primary current is normally conducted through a thick cable, while the secondary current flows through a thinner cable.
Current transformers are frequently used in electrical networks, power distribution systems and industrial plants. They make it possible to measure or monitor the current in a system without the need for a large current to flow directly through a measuring device. This improves safety and reduces the likelihood of damage to the meter.
In addition, current transformers enable the monitoring of power consumption, the measurement of power factors and the detection of residual currents in electrical systems. They are also installed in transformers and switch cabinets to monitor the current and trigger protective circuits if necessary.
How does a current transformer work?
A current transformer is an electrical device that is used to measure or monitor the current in an electrical circuit. It converts the input current into a proportional output current that can be measured more easily.
The current transformer normally consists of a primary and a secondary winding or conductor circuit. The primary circuit is connected to the main circuit through which the current to be measured flows. The secondary circuit is connected to a measuring device such as an ammeter or a current transformer.
When the current flows through the primary circuit, it generates a magnetic field around the primary circuit. This magnetic field induces a voltage in the windings of the secondary circuit. The level of the induced voltage is proportional to the input current.
The windings of the secondary circuit are normally designed to generate a lower voltage than the primary circuit. This makes the current transformer safer to handle and enables the use of smaller measuring devices.
The output current of the secondary circuit can then be measured with an ammeter or a current transformer to determine the current in the primary circuit.
Current transformers are often used in power supply systems to measure the current in high-voltage lines without influencing the line or connecting the measuring devices directly to the high-voltage current. They are also used in industrial plants to monitor the current in large electrical machines or systems.
The current transformer normally consists of a primary and a secondary winding or conductor circuit. The primary circuit is connected to the main circuit through which the current to be measured flows. The secondary circuit is connected to a measuring device such as an ammeter or a current transformer.
When the current flows through the primary circuit, it generates a magnetic field around the primary circuit. This magnetic field induces a voltage in the windings of the secondary circuit. The level of the induced voltage is proportional to the input current.
The windings of the secondary circuit are normally designed to generate a lower voltage than the primary circuit. This makes the current transformer safer to handle and enables the use of smaller measuring devices.
The output current of the secondary circuit can then be measured with an ammeter or a current transformer to determine the current in the primary circuit.
Current transformers are often used in power supply systems to measure the current in high-voltage lines without influencing the line or connecting the measuring devices directly to the high-voltage current. They are also used in industrial plants to monitor the current in large electrical machines or systems.
What different types of current transformers are there?
There are different types of current transformers that are used depending on the application and requirements:
1. Current transformer with iron core: This type of current transformer uses an iron core to measure the current flow. They are generally inexpensive and are often used in electrical distribution systems.
2. Rogowski coils: These current transformers use flexible coils to measure the current flow. They are particularly useful when it comes to measuring high currents as they have no magnetic cores and therefore no saturation effect.
3. Hall effect sensors: This type of current transformer is based on the Hall effect, in which a magnetic field influences the electric current in a conductive material. Hall effect sensors can measure both direct and alternating current.
4. Optical current transformers: Optical current transformers use optical fibers or optical sensors to measure the current flow. They are generally very precise and are well suited for applications where galvanic isolation is required.
5. Combined current and voltage transformers: Some current transformers can measure both current and voltage. These combined converters are particularly useful for carrying out power measurements and monitoring electrical parameters.
This list is not exhaustive, as there are other specialized types of current transformers that have been developed for specific applications.
1. Current transformer with iron core: This type of current transformer uses an iron core to measure the current flow. They are generally inexpensive and are often used in electrical distribution systems.
2. Rogowski coils: These current transformers use flexible coils to measure the current flow. They are particularly useful when it comes to measuring high currents as they have no magnetic cores and therefore no saturation effect.
3. Hall effect sensors: This type of current transformer is based on the Hall effect, in which a magnetic field influences the electric current in a conductive material. Hall effect sensors can measure both direct and alternating current.
4. Optical current transformers: Optical current transformers use optical fibers or optical sensors to measure the current flow. They are generally very precise and are well suited for applications where galvanic isolation is required.
5. Combined current and voltage transformers: Some current transformers can measure both current and voltage. These combined converters are particularly useful for carrying out power measurements and monitoring electrical parameters.
This list is not exhaustive, as there are other specialized types of current transformers that have been developed for specific applications.
Which measuring ranges can be covered by a current transformer?
A current transformer can cover different measuring ranges, depending on its design and specification. Typical measuring ranges for current transformers can be:
- Low current range: e.g. 0-5 amps or 0-20 amps
- Medium current range: e.g. 0-100 amps or 0-500 amps
- High current range: e.g. 0-1000 amps or 0-5000 amps
- Very high current range: e.g. 0-10000 amperes or 0-50000 amperes
These values are only examples and may vary depending on the application. It is also possible to manufacture special current transformers for even higher current ranges.
- Low current range: e.g. 0-5 amps or 0-20 amps
- Medium current range: e.g. 0-100 amps or 0-500 amps
- High current range: e.g. 0-1000 amps or 0-5000 amps
- Very high current range: e.g. 0-10000 amperes or 0-50000 amperes
These values are only examples and may vary depending on the application. It is also possible to manufacture special current transformers for even higher current ranges.
How accurate are current transformers in measuring electrical current?
Current transformers are devices that measure the electrical current in a power line and convert it into a signal that can be understood by measuring devices. They are frequently used in the electrical power supply and in industry.
Current transformers consist of a primary and a secondary winding system. The primary winding is connected in series with the current line to be measured and absorbs the current. The current flow through the primary winding generates a magnetic field that is proportional to the current.
The secondary winding is connected to a measuring device and generates a voltage that is proportional to the current in the primary winding. This voltage enables the current transformer to measure the current value and transmit it to the measuring device. The output voltage of the current transformer can also be further amplified or reduced by an integrated transformer in order to meet the specific requirements of the measuring device.
It is important to note that current transformers can only measure the current value and do not provide any information about the voltage or other electrical parameters. They are therefore mainly required for current measurement in power lines or in conjunction with other devices such as voltmeters or power meters in order to obtain a complete picture of the electrical system.
The accuracy of current transformers can depend on various factors such as the quality of the materials used, the design of the device and the calibration. High-quality current transformers are often calibrated in laboratories and can achieve accuracies of a few percent. In industrial applications where high accuracy is less important, less precise current transformers can also be used.
Overall, current transformers are crucial for measuring electrical current and enable the current in power lines to be monitored, consumption to be measured and electrical systems to be operated efficiently.
Current transformers consist of a primary and a secondary winding system. The primary winding is connected in series with the current line to be measured and absorbs the current. The current flow through the primary winding generates a magnetic field that is proportional to the current.
The secondary winding is connected to a measuring device and generates a voltage that is proportional to the current in the primary winding. This voltage enables the current transformer to measure the current value and transmit it to the measuring device. The output voltage of the current transformer can also be further amplified or reduced by an integrated transformer in order to meet the specific requirements of the measuring device.
It is important to note that current transformers can only measure the current value and do not provide any information about the voltage or other electrical parameters. They are therefore mainly required for current measurement in power lines or in conjunction with other devices such as voltmeters or power meters in order to obtain a complete picture of the electrical system.
The accuracy of current transformers can depend on various factors such as the quality of the materials used, the design of the device and the calibration. High-quality current transformers are often calibrated in laboratories and can achieve accuracies of a few percent. In industrial applications where high accuracy is less important, less precise current transformers can also be used.
Overall, current transformers are crucial for measuring electrical current and enable the current in power lines to be monitored, consumption to be measured and electrical systems to be operated efficiently.
What are the advantages of using a current transformer?
The use of a current transformer offers several advantages:
1. measurement of high currents: Current transformers enable the measurement of high currents that cannot normally be measured directly. You can convert the current to a tolerable level that is compatible with the measuring devices.
2. Security: Current transformers allow the current to be measured without the power line having to be interrupted. This makes it safer for the measuring process as there is no direct contact with the current.
3. Low losses: Current transformers generally have a low resistance and therefore generate only minimal losses in the circuit. This enables precise and accurate measurement of the current.
4. Isolation: Current transformers provide electrical insulation between the primary and secondary circuits. This protects the measuring devices and other electronic components from damage caused by high voltage or faults in the circuit.
5. Scalability: Current transformers can be manufactured in different sizes and types depending on requirements. They can be adapted to different currents and applications.
6. Energy efficiency: By using current transformers, the power consumption in a system can be optimized as they can measure and monitor the power consumption.
Overall, current transformers enable precise and safe measurement of current and offer a number of advantages for various applications.
1. measurement of high currents: Current transformers enable the measurement of high currents that cannot normally be measured directly. You can convert the current to a tolerable level that is compatible with the measuring devices.
2. Security: Current transformers allow the current to be measured without the power line having to be interrupted. This makes it safer for the measuring process as there is no direct contact with the current.
3. Low losses: Current transformers generally have a low resistance and therefore generate only minimal losses in the circuit. This enables precise and accurate measurement of the current.
4. Isolation: Current transformers provide electrical insulation between the primary and secondary circuits. This protects the measuring devices and other electronic components from damage caused by high voltage or faults in the circuit.
5. Scalability: Current transformers can be manufactured in different sizes and types depending on requirements. They can be adapted to different currents and applications.
6. Energy efficiency: By using current transformers, the power consumption in a system can be optimized as they can measure and monitor the power consumption.
Overall, current transformers enable precise and safe measurement of current and offer a number of advantages for various applications.
What are the most important attributes to consider when selecting a current transformer?
There are several important attributes to consider when selecting a current transformer:
1. Measurement range: The current transformer should cover the desired measuring range. It is important to ensure that the current transformer can handle the maximum current to be measured without any problems.
2. Accuracy: The accuracy of the current transformer is a decisive factor. The more accurate the current transformer, the more precise the measurement results. The accuracy is specified as a percentage or in amperes per ampere (A/A).
3. Frequency range: The current transformer should cover the desired frequency range. Depending on the application, it may be necessary for the current transformer to be able to process high frequencies.
4. insulation level: The current transformer should have sufficient insulation to ensure safe operation. The insulation level is specified in kilovolts (kV) and indicates how much voltage the current transformer can insulate.
5. Phase shift: The phase shift indicates how much the output signal of the current transformer is delayed compared to the input signal. A small phase shift is particularly important when precise synchronization with other devices is required.
6. Temperature range: The current transformer should cover the desired temperature range. Depending on the application, it may be necessary for the current transformer to work reliably even at extreme temperatures.
7. Mounting type: Depending on the application and installation situation, different types of mounting may be required, e.g. rail mounting, panel mounting or support mounting.
8. Costs: Of course, cost also plays a role when choosing a current transformer. It is important to find a balance between the attributes you need and the budget you have available.
These attributes should be taken into account when selecting a current transformer to ensure that it meets the requirements of the application and provides reliable measurement results.
1. Measurement range: The current transformer should cover the desired measuring range. It is important to ensure that the current transformer can handle the maximum current to be measured without any problems.
2. Accuracy: The accuracy of the current transformer is a decisive factor. The more accurate the current transformer, the more precise the measurement results. The accuracy is specified as a percentage or in amperes per ampere (A/A).
3. Frequency range: The current transformer should cover the desired frequency range. Depending on the application, it may be necessary for the current transformer to be able to process high frequencies.
4. insulation level: The current transformer should have sufficient insulation to ensure safe operation. The insulation level is specified in kilovolts (kV) and indicates how much voltage the current transformer can insulate.
5. Phase shift: The phase shift indicates how much the output signal of the current transformer is delayed compared to the input signal. A small phase shift is particularly important when precise synchronization with other devices is required.
6. Temperature range: The current transformer should cover the desired temperature range. Depending on the application, it may be necessary for the current transformer to work reliably even at extreme temperatures.
7. Mounting type: Depending on the application and installation situation, different types of mounting may be required, e.g. rail mounting, panel mounting or support mounting.
8. Costs: Of course, cost also plays a role when choosing a current transformer. It is important to find a balance between the attributes you need and the budget you have available.
These attributes should be taken into account when selecting a current transformer to ensure that it meets the requirements of the application and provides reliable measurement results.