In this article we will describe the scheme of connecting a three-phase electrical meter to the power grid and give tips on the installation. We recommend not only responsible to study electroschemesBut also to see several video lessons in which the technology of electrical installation is described.
How to connect a three-phase meter - preliminary stage
Connecting a three-phase electrical meter is a shutdown step of electrical work. To install the counter, be sure to have a mounting scheme. It is necessary to check the device for the presence of a seal. Each seal should be marked the quarter and the year of the last check, as well as the print of the believer.
Attaching the wires to the clamps, you need to make a stock of 70 millimeters. This measure will continue to measure the current / power consumed. If the scheme is assembled not correct, then you can redo everything.
Use 2 screws to join each wire. Upper screw must be tightened first. Make sure the wire is clamped (twitch it) and tighten lower. If a multicore wire is used to connect a three-phase meter, then all its tips will have to pay.
How to connect a three-phase meter - direct inclusion
The easiest way to connect, resembling a standard single-phase meter installation scheme is a direct meter connection. Such devices are characterized by a large number of terminal contacts greater than in single-phase meters.
Sequencing
- The supplying conductors must be cleared of isolation and connect to a three-phase type protective switch.
- Immediately after connecting to the machine, you need to connect phase veins (3 pieces) to pair terminals. You need to start on the right side of the device. Enter phase wiring you need from odd clamps.
- The zero conductor connects to the other remaining contacts.
- After connecting the electrical meter, three-pole protective automata are installed.
- Standard household equipment can be connected to three-phase meters. To do this, make a discharge single-pole Machine from the phase wire, from zero terminal.
How to connect a three-phase meter - indirect connection
If the parameters of the total load is exceeding the rated current value, which passes through the electrical counter, you will have to install a separation current transformer. Its installation is performed in the gap of the current-purpose power wire.
Sequencing
- Three transformers are connected separately for each wire. They are attached on the back of the introductory locker. Primary windings are connected directly behind the inner switches. The three-phase counter is mounted in the cabinet.
- A conductor with a diameter of 1.5 mm is connected to the transformer phase duty. Free ends come to the second terminal contact of the three-phase electric meter.
- 2 remaining transformers are connected by analogy.
- Observe the accuracy of the winding connection. If the device is incorrectly connected, the instrument will be wrong.
- Connect the remaining windings of transformers to the corresponding counter contacts.
- As a result, 1 contact will be used to connect the tire. range.
Why three-phase meters are popular
Now, in addition to conventional two-phase counters, three-phase meters became popular. This is explained by their multifunctionality and the possibility of maintaining expenses on electricity consumption.
Note, when using a single-phase connection of the consumer 20 kW, it would take a large cable. The distribution of the load at the same time is to carry out problematic, as 1 phase and 0 will be involved. The three-phase connection allows you to fully solve this problem.
The need for a three-phase meter is associated with measuring the magnitude of reactive and active electricity. You must be able to distinguish with reactive and active meters:
- multi-tariff 1st and 2 directed;
- one idarithric Direct connection with the accuracy class 1 and 2, equipped with an indicator.
Suggested in the article Connection methods are universal . If necessary, you can always view detailed instructions in the ES passport.
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