Single-phase meters are used in circuitsdirect and alternating current. There are many types of devices, and they differ among themselves on completing elements. Select classical, wired and high-frequency devices that can operate from power transformers.
How to connect a single-phase meter?To answer this question, we must first of all understand the limiting conductivity of the device and the magnitude of the permissible voltage. The overload indicator of the counters can be very different.
Connection of the classical model
How to connect a single-phase classic counter?The model installation scheme assumes the use of one switch. Input contacts are connected on a first-order contactor. The resistance value on the trigger must be at least 120. Also, we must pay attention to the fact that the insulators at the blocks must be located behind the switch. Conductors are most often used with a controller. With an increase in the resistance level, electromagnetic filters are installed. When an old single-phase meter is connected, the first-order contacts close on the plate. The nominal voltage in the circuit must be about 230 V, and the permissible overload is 5 A.
Direct connection scheme
How to connect the meter(single-phase) and automata? Direct activation of the unit is carried out through the channel trigger. Its output pins are connected to the rectifier. The semiconductor converter is tuned to two frequencies. To install the filter, you should use the tester. The nominal resistance in the circuit should not exceed 30 ohms. Models for three contacts must be connected via a binary adapter. The first controller is connected via a converter. The nominal resistance in the circuit is about 70 Ohm, and the voltage reaches 230 V.
Devices for transformer connection
How to connect a single-phase electrical meter?Models for transformers are distinguished by the presence of a frequency comparator. Many modifications use a resonant adapter, which works from a blocker. A controller is used to connect to the shield. The first element expander is connected to the converter. Before this, the resistance in the chain is measured.
The specified parameter averages 55 ohms.When closing the contacts of the second order, the rated voltage is checked. If we consider a circuit with an inverting comparator, then a counter is used for the counter. The device's contacts are connected via a trigger. In this case, the filters are installed behind the converter. If we consider a model with one expander, then the trigger can be used with an overlay. When the expander is connected, contacts of the first and second order are closed. The nominal voltage of the elements is 230 V. The controller in this case is connected via the analog output.
Models for the power circuit
How to connect a single-phase meter to the power circuit?You can use switches to do this. The trigger is often used with a broadband adapter. The first-order contacts are connected to the output connector. If you look at the shields by 200 W, the overload indicator on the meter should be at least 3 A. It is additionally important to pay attention to the resistance when connecting the trigger. The specified parameter is 50 ohms on the average.
However, models with contact expanders do notare able to work at such a resistance, and the nominal voltage at them reaches a maximum of 230 V. If we consider shields with two adjustable adapters, then the contacts of the first order are closed at the output diode. Connect the model via the rectifier only with a filter. Dinistors for counters are selected at 4 microns.
Connection through measuring transformers
How to connect a single-phase meter throughmeasuring transformers? In fact, you can do this directly with the trigger. The limiting resistance at it should be not less than 45 Ohm, and the voltage - as much as 230 V. The overload indicator in this case depends on the type of the converter. If we consider linear models, then the contacts of the first order are closed at the output of the circuit.
Overload in this case will be about 5 A.Contacts of the second order are connected to the expander. At a frequency of 55 Hz, the resistance should not exceed 40 ohms. Very often transformers use electromagnetic contactors. In this situation, you need to use the tester. With increased voltage, the comparator is selected by the electrode type. If we talk about the expander, then the connection to the contacts is via an adapter.
Devices at 30 Hz
How to connect a single-phase meter(old)? Models at 30 Hz in the shields are installed through the trigger. If broadband modifications are considered, then the isolator is used at the output of the circuit. Many models have an analog output. Contacts of the first order are closed on the converters. Resistance before the trigger should be no more than 40 Ohm. Expanders are allowed to be used with the controller. Unijunction modifications have good conductivity, but often lead to overloads of the controller. Counters with a phase adapter must not be used in a DC circuit. The rated voltage at the output of the meter must be at least 200 V with an overload of 10 A.
Connection models on 40 Hz
How to connect a single-phase counter to 40 Hz?For this purpose, a comparator is used. To date, there are many models with operational triggers. First-order contacts should be normally closed on the converter. If there are any problems with the voltage, the resistance is checked.
The output overload is on average 50 ohms.The permissible voltage level is 230 V with a deviation of not more than 15%. If we talk about electrode converters, then a single dipole adapter will be needed to connect the meter. Second-order contacts can only be connected via a comparator.
Modifications at 50 Hz
Counters at 50 Hz are connected via analog andpassing triggers. Some modifications work in shields with rectifiers. The rated voltage in the circuit is maintained at 230 V. The permissible deviation is dependent on many factors. First of all, it's important to consider the type of trigger. In addition, the converter output is considered. If we talk about the model for two adapters, then the filter will be required with a high throughput. The resistance at the shield should be about 55 ohms. The first contact extender is closed on the inverter.
Electromechanical counters are connected onlythrough analog triggers. Converters in this case are suitable with a conductivity of 40 Ohm. If we consider the modifications to two contacts, then the resistance in the circuit should be about 55 Ohm, and the overload is approximately 2 A. Insulators are installed behind the converter. Controllers in the shield should be connected through first-order contacts. In addition, it should be noted that many counters are obtained with the expander.
Scheme of electronic modifications
How to connect a single-phase meter correctly?Electronic models can be installed in a DC circuit, and conductivity is maintained at a high level. If we consider circuits with dipole triggers, then converters will need a contact type. The contactor is connected at high conductivity, and the load factor for the models is about 4 A.
Before connecting the rectifier, a measurement is madenegative resistance. If it exceeds 30 Ohm, then a filter with an adapter is installed. Otherwise, it is not required. Also there are models with dinistors, which operate from converters.
The permissible voltage level for them is230 V. They are capable of operating in an alternating current circuit. However, they are not suitable for power plants. The operating frequency of the modifications is about 40 Hz. Triggers in this case are of an analog type. Contacts of the first order are closed on the converter. To balance the voltage, a dinistor is used.