Installation points for electricity meters

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Accounting for electricity. Installation points for electricity meters

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.5.6. It is recommended to install meters for calculating the power supply organization with electricity consumers at the network interface (according to the balance sheet) of the power supply organization and the consumer.

1.5.7. Estimated active electricity meters at the power plant should be installed:

1) for each generator in such a way that all electricity generated by the generator is taken into account;

2) for all connections of the generator voltage buses, through which reverse operation is possible, - two counters with stoppers;

3) for intersystem transmission lines - two counters with stoppers, taking into account the released and received electricity;

4) for lines of all voltage classes, extending from the buses of power plants and belonging to consumers (see also 1.5.10).

For lines up to 10 kV, extending from the buses of power plants, in all cases, metering circuits, clamp assemblies (see 1.5.23) must be made, and places are also provided for installing meters;

5) for all transformers and lines supplying the main voltage busbars (above 1 kV) for auxiliary needs (SN).

The meters are installed on the higher voltage side; if the SN transformers of the power plant are fed from buses of 35 kV and above or by a branch from units at a voltage above 10 kV, it is allowed to install meters on the low voltage side of the transformers;

6) for lines of economic needs (for example, power supply of mechanisms and installations of repair and production bases) and extraneous consumers connected to the switchgear of SN of power plants;

7) for each bypass switch or for a bus-connecting (intersectional) switch used as a bypass for connections with settlement accounting, two counters with stoppers.

At power plants equipped with systems for centralized collection and processing of information, these systems should be used for centralized settlement and technical accounting of electricity. At other power plants, the use of an automated electricity metering system is recommended.

1.5.8. At power plants with a capacity of up to 1 MW, calculated active electricity meters should be installed only for generators and MV transformers or only for MV transformers and outgoing lines.

1.5.9. Estimated active electricity meters at the substation of the power system should be installed:

1) for each outgoing transmission line owned by consumers (see also 1.5.10);

2) for intersystem transmission lines - two counters with stoppers, taking into account the released and received electricity; in the presence of branches from these lines to other power systems - two counters with stoppers, taking into account the received and released electricity, at the inputs to the substations of these power systems;

3) on MV transformers;

4) for lines of household needs or extraneous consumers (village, etc.) connected to the MV buses;

5) for each bypass switch or for a bus-connecting (intersectional) switch used as a bypass for connections with settlement accounting, two counters with stoppers.

For lines up to 10 kV, in all cases, metering circuits, clamp assemblies (see 1.5.23), and places for installing meters must be provided.

1.5.10. Estimated meters, provided in accordance with 1.5.7, clause 4 and 1.5.9, clause 1, may be installed not at the supply, but at the receiving end of the line at the consumer in cases where current transformers at power plants and substations, selected by current Short circuit or according to the characteristics of differential busbar protection, do not provide the required accuracy of electricity metering.

1.5.11. Estimated active electricity meters at a substation owned by the consumer should be installed:

1) at the input (receiving end) of the power line to the consumer's substation in accordance with 1.5.10 in the absence of electrical connection with another substation of the power system or another consumer at the supply voltage;

2) on the higher voltage side of the transformers of the consumer's substation, if there is an electrical connection with another substation of the power system or there is another consumer on the supply voltage.

It is allowed to install meters on the low voltage side of the transformers in cases where the current transformers selected for the short circuit current or for the characteristics of the differential protection of the tires do not provide the required accuracy of electricity metering, and also when the existing built-in current transformers do not have a winding of accuracy class 0,5.

In the case when the installation of additional sets of current transformers on the low voltage side of power transformers to turn on the calculated meters is not possible (KRU, KRUN), it is allowed to organize accounting on outgoing lines of 6-10 kV.

For an enterprise that pays off with an electricity supply organization at the maximum declared capacity, it should be provided for the installation of a meter with a maximum load indicator if there is one metering point, if there are two or more metering points - the use of an automated electricity metering system;

3) on the medium and low voltage side of power transformers, if on the higher voltage side the use of measuring transformers is not required for other purposes;

4) on MV transformers, if the electricity supplied for own needs is not taken into account by other meters; at the same time, it is recommended to install meters on the low voltage side;

5) at the boundary between the main consumer and an outside consumer (sub-subscriber), if an outside consumer that is on an independent balance is also powered from the line or transformers of consumers.

For consumers of each tariff group, separate settlement meters should be installed.

1.5.12. Reactive electricity meters should be installed:

1) on the same circuit elements on which active electricity meters are installed for consumers paying for electricity, taking into account the reactive power allowed for use;

2) at the connections of reactive power sources of consumers, if they are used to pay for electricity supplied to the grid of the power system, or the specified mode of operation is monitored.

If on the part of the enterprise, with the consent of the power system, reactive electricity is supplied to the power system network, it is necessary to install two reactive electricity meters with stoppers in those elements of the circuit where the calculated active electricity meter is installed. In all other cases, one reactive energy meter with a stopper must be installed.

For an enterprise that pays off with an energy supply organization according to the maximum permitted reactive power, it should be provided for the installation of a meter with a maximum load indicator, if there are two or more metering points, the use of an automated electricity metering system.

See other articles Section Rules for the installation of electrical installations (PUE).

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