The three-phase counter is an energy accounting device used on a network with a voltage of 380 volts and used in places with substantial energy costs: trade and technical complexes, offices, livestock farms, country houses. The meter can be installed independently, having previously received "good" in the appropriate organization and adopting our recommendations for the basis.
How to connect a three-phase meter - the initial stage
We will analyze the situation when there is an equipped shield, but without the very countable apparatus that you have to buy and put.
Your actions:
- Make an audit in the electrical cabinet, and you will see that four wires come to the connection position: one is zero and three - phase.
- Calculate the exemplary dimensions of the device (measuring the unfilled portion of the shield) and purchase the desired unit.
- Next - turn off the voltage, fix the device in the box using the Dean Rake and the preparatory activities are completed.
How to connect a three-phase meter - direct installation
Three-phase input methods are divided into two types: direct and indirect inclusion. The first is connected according to the principle of a single-phase meter, the second - using the current transformer.
Remember: Connecting in from left to right, with all odd ends - input, even load.
Direct installation course:
- The first wire is allowed to phase a (input), the second to the load phase.
- The 3rd and 4th will go to the phase B, affecting the input and load.
- 5th - Phase C (Login), Six, the same, but load.
- Seventh - direct on zero (input), eighth - on zero (load).
How to connect a three-phase counter in an indirect way
Such devices are used at a power of more than 60 kW, where the integral additions are measuring transformers that reduce the current-running current.
Consider the simplest way of the connection, called the "star electricians":
- Looking at the drawing, close the contacts (further - K.) - 3, 6, 9, 10 and move to zero.
- Closed contacts И2 - to 11 terminal, and k.1 to and1 phases A.
- Following - K.4 to and1 phases B, and the seven will introduce and1 phases of C. in L1, get the second, fifth, eighth contacts from the phases - A, B, C.
- Connect the tenth terminal to the joint running bus. All - the counter is connected. It remains to be sealing, causing a specialist and you can use.
How to connect a three-phase meter - saving funds
Buying and connecting the three-phase apparatus - the case is not cheap (the price of the device is high), time consuming, but profitable. We analyze the advantages of acquisition:
- Entering the counter of this type, you can evenly dispersed the phase load, reduce the cross section of the incoming cable and include directly powerful electric motors.
- Do not forget about the accuracy class (the digit in the circle standing on the instrument housing) and take the model with the smallest error - from 2.0 to 0.5.
- Choose a meter with interchangeable tariffs (day-night) and save up to 60% of energy, and if you finish the energy-saving light bulbs - the money will save a lot.
So, we figured out how to install a three-phase counter itself. The main thing - do not forget about the rules of security, do not engage in amateuria, and follow the aforementioned connection schemes.
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