How to connect a single-phase meter: tips and rules

Single-phase meters are used in DC and AC circuits. There are many types of devices, and they differ among themselves on the components. Select classical, wired and high-frequency devices that can operate from power transformers.

How to connect a single-phase meter? To answer this question, one must first of all understand the limiting conductivity of the device and the magnitude of the allowable voltage. The overload factor 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 should 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 electricity meter (single-phase) and automatics? 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 the blocker. For connection to the shield, a controller is used. 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 the contacts of the second order are closed, the rated voltage is checked. If we consider a circuit with an inverting comparator, then a counter is used for the counter. The device 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 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 we consider the shields at 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 are not able to work at this resistance, and the nominal voltage at them reaches a maximum of 230 V. If we consider shields with two adjustable adapters, then first-order contacts 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 through measuring 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 first-order contacts are closed at the output of the circuit.

Overload in this case will be about 5 A. Second-order contacts 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 an increased voltage, the comparator is selected by the electrode type. If we talk about the expander, then the connection to the contacts occurs via an adapter.

Devices at 30 Hz

How to connect a single-phase (old) electricity meter? Models at 30 Hz in the shields are installed through the trigger. If we consider broadband modifications, then the isolator is used at the output of the circuit. Many models have an analog output. Contacts of the first order are closed to converters. Resistance before the trigger should be no more than 40 ohms. 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 meter output must be at least 200 V with an overload of 10 A.

Connection models at 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. The first order contacts must 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 through analog and loop triggers. Some modifications work in shields with rectifiers. The nominal voltage in the circuit is maintained at 230 V. The tolerance is dependent on many factors. First of all it is 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 high throughput. The resistance at the shield should be about 55 ohms. The first contact extender is closed on the inverter.

Electromechanical Models

Electromechanical counters are connected only through 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 is worth noting that many counters are obtained with an 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 flip-flops, 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, negative resistance is measured. 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 work from converters.

The permissible voltage level is 230 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.