Power limiter: wiring diagram

The power limiter is a device that regulates the supply of electricity to the house. It works, as a rule, in a network with alternating current. Thanks to modern limiters, the service life of low-power transformers can be significantly extended. Also with their help, the power consumption between users is regulated. Additionally, limiters can be configured so that unauthorized connections are unavailable. To date, all devices of this type are divided into single-phase and three-phase models.

Features of single-phase limiters

The single-phase power limiter has a limiting voltage of 300 V. The operating frequency of the device is on the average 60 Hz. Minimum limiters are able to produce power of 3 kW, and a maximum of as much as 30 kW. However, in this situation, much depends on the manufacturer. Additionally, a parameter such as delay is taken into account. It ultimately affects the device's voltage limit. Overcurrent for single-phase limiters can be a maximum of 3 A. It should also be noted that for devices of this type, sudden voltage surges are unacceptable.

What is the difference between three-phase limiters?

The power limiter (three-phase) voltage limit keeps at the level of 350 W. In turn, its operating frequency is at 70 Hz. The minimum limiters are able to hold a power of 5 kW, and a maximum of as much as 40 kW. In addition, it should be taken into account that they have a rather high discreteness index.

The delay in turn-off, in turn, averages about 10 seconds. Power overloads three-phase modifications are able to withstand fairly large. Voltage drops are also perceived as serious. From the shortcomings of these devices, it should be noted that the current is unstable in the relay contacts. In addition, there are large errors in the measurements. Thus, the three-phase limiters need more serious adjustment.

How to connect the device?

The power limiter, as a rule, is connected over the input automaton. Thus the high-voltage wire should be near the starter. Directly the zero bus is connected to the electricity meter. Connection to the transformer is carried out in series. For the normal operation of the limiter, first the shoe is exposed.

The power connection is checked for each phase separately. The top pads, in the long run, all should be in the up position. The electromagnetic latch is turned on last. Second-line shoe should close all relay contacts. To avoid any overload, the device is equipped with a special alarm. The last pair of pads is necessary to set the desired mode. After securing the limiter, the tubular inlets are checked, as well as the main power wire.

Limiter OM-630

The device is connected via a 35 mm rail. Limit voltage power limiter OM-630 withstand at 300 V at a working frequency of 60 Hz. The minimum capacity of the device is able to produce 4 kW, and a maximum of as much as 30 kW. The discreteness index for this model is good and is at the level of 0.2 kV. The retry delay is on average 5 seconds. With a sharp drop in voltage, the OM-630's power limiter can shut down quite quickly. Current load device can withstand a maximum of 5 A.

Device model OM-1

This model is connected via a special bus, which is located under the counter. Maximum switching current, the specified power limiter (shown below) can withstand 16 A. The device can be adjusted from 3 to 30 kW. The degree of protection in OM-1 is IP20. The total retry delay varies around 6 seconds. With an external AC transformer, the specified limiter is operable. With a sudden voltage drop of 20 V, the device is automatically disconnected. In addition, it should be noted that this limiter is fairly simple to install. This is due to the fact that the kit includes a special rack on which the case is fixed.

Connection limiter OM-1-2

The OM-1-2 power limiter is connected through the input automat. The high-voltage wire must be located behind the cover of the device. First of all, it is important to attach all the contacts to the electricity meter. Next, you need to set the zero bar in the shield. Lastly, the starter is activated, which is above the zero-sequence transformer.

The first three blocks of the limiter are connected directly to the relay. In order for the pulse to pass, a separate contact is activated on the panel. Second-line shoe serve for external signaling of the limiter. Tubular inputs of the device are checked last. To set the required mode, the extreme pair of pads is used.

Connection diagram for single-phase model with electric strike

In this case, the first pair of pads should be in a neutral position. Connection to the power supply is via a special connector. For the first phase, the voltage is checked first. For the electromagnetic latch, the relay contact K1 is used. Second-line shoe in the limiter are designed for priority loading. To access external signaling, use contacts of different power. Pads of the third line are intended only for setting the mode. Tubular inlets are directly connected to the power cable.

Connection diagram with closed contacts

Connecting a limiter with closed contacts assumes the use of discrete switches. The display system is checked by special LEDs. Thus, the user has the ability to monitor the voltage limits. External signaling in this case plays a key role.

In order for the limiter to be able to withstand a heavy load, the first pair of pads are placed in a neutral position. The starting pulse in the system is suppressed due to the electromagnetic latch. Pads of the second line are necessary only for overcoming the priority load. In turn, the power shutdown occurs due to the zero bus. The switch that connects to the zero phase closes the chain in the network.

Connections of the limiter with open contacts

In order to connect a limiter with open contacts, it is important to configure the starter. After that, the first pair of pads are set to the upper position. The introductory machine should be located immediately behind the power cable. To avoid low-frequency overload, use switches. The supply of the current to the zero-sequence transformer is due to the group automatic machines, which are fixed to the silicone seals.

Devices OM-630-2

Limit voltage power limiter 630-2 is able to withstand at 340 V at a working frequency of 70 Hz. The measure of discreteness is 3 kW. The device is connected to the meter through closed contacts. The delay in the overload trip is approximately 40 seconds on average. Voltage drop maximum this limiter is able to withstand 30 V. In turn, with an overload the system can handle 5 A. The error of measurement in these models is quite small, and this should be taken into account. In addition, it is important to note that the re-activation of the limiter occurs quickly.

Connecting the OM-630-3 device

This power limiter is turned on (connection diagram is shown below) via the bus. Group semi-automatons in this case are connected in the last turn. The upper pair of pads must be in the up position before the current is applied. In turn, the pair of the second line should stand in a neutral position. Due to this, the voltage in the device quickly stabilizes. To combat priority overloads, special blocks are used. They are attached directly to the electricity meter. Verify the correct connection of the limiter can always be based on the indicators of the display system.

Single-phase model OM-310

To connect this model to the network, a 35 mm rail is used. The power limiter 310 is calculated for a voltage of 250 V at a working frequency of 45 Hz. Power at least can be set at 5 kW, and a maximum of 33 kW. The discreteness of this limiter is quite substantial and is 0.3 kV. In turn, the delay for the shutdown is 6 seconds. The device is restarted quickly. Voltage drop maximum OM-310 is able to withstand 5 V. In turn, the current overload should not exceed 6 A. There are two switches in the device.

Devices for working with an external transformer

The power limiter of this type is connected, as a rule, with the help of a 40 mm ream. The introductory machine in this case must be located under the box next to the power cable. The device is connected to the electricity meter last. The zero bus is connected to the first two contacts, which are the closing contacts.

It is additionally important to install a starter, which regulates the operation of the zero-sequence transformer. Before this, the user must configure the first pair of pads on the device. To do this, they should first be set to the top position and then look at the display system. If the green LED is triggered, then the system is closed. Further, these pads are translated into a neutral position in order for the signal to pass unhindered. Then the relay contacts are configured.

First of all, they should be thoroughly cleaned. In this case, the tubular bushings are connected in series. Further it is important to close the electromagnetic latch. To this end, it is necessary to remove the protective cover and move the wiring of the chain. Pads of the third line are set to the top position in turn. In doing so, the user is obliged to monitor the display system. If a green LED is activated during the procedure, this indicates that the circuit is closed. To prevent external alarms from being activated in the system, you need to disconnect relay contacts. After this, the tubular connections must be reconnected.