LT4135B - Device for estimating a price of electric power payable by exchangeable tariff - Google Patents

Abstract

In the device there are installed single tariff electric induction meters and a tariff coefficient transformer, which is common for all meters and allows change of tariff number during operation of the device. The transformer uses a voltage divider, the voltage of which is as follows:Ui = U ai/a1where U is the operational voltage, connected via the tariff wire to meter voltage windings, and a1...ai are the tariffs at certain time intervals.

Description

The invention is within the scope of electrical measurements and can be used to determine the cost of energy consumed, i.e.. the amount of money that a consumer has to pay for electricity supplied at a variable rate over time, especially when a group of consumers are spread over a geographically small area.

Known multi-tariff electricity recording meters comprising at least two sensors of different sensitivity, which are switched by a clock-type mechanism (Swiss patent specification CH679078, description of patent application SU 1765776). However, these meters are complex, expensive and not reliable enough for mass use. In addition, such meters have a design-defined number of tariffs. Also known is a variable-rate electricity pricing device (SU 1821747) having single-rate electro-inductance meters, to which the voltage contacts are connected to the consumer voltage, and to the current-to-rate converter-to-current transformer windings, each having three short-circuit relays. sections, ends. In this device, the energy Ai at the first tariff time is measured with a proportionality factor equal to 1 and the energy at other intervals ą with the factor - where ą is the tariff at that time interval.

The cost of electricity B is obtained from the relation

B's (A, + A ₂ + A ₃ + ... +), o

A = A _t .

where A _t is the actual amount of energy consumed,

A,, Ao is the relative amount of energy recorded by the meter.

moving meter of the electric meter used in the unit! part is a metal disk mechanically connected to the meter. The disk is rotated by an electro-inductive system consisting of current I (serial connection) and voltage U (parallel connection) windings. The torque M _s , which is proportional to the meter reading, is described by the relationship

M _s = 0 ₁ Φ ₁ Φ ₂ 008φ ₁ = C2lUC0S <p ₂ where Φ! and Φ ₂ is the magnetic flux of the current and voltage windings,

Ψι, <p ₂ - phase shift angle, c _t and c ₂ - factors.

However, this device is only suitable for a limited, design-defined number of tariffs, which cannot be replaced by service lies, inconvenient for centralized multi-user tariff changes. In addition, the construction of the unit is complicated and expensive, because we use the tariff coefficient converter function! special current transformers.

The object of the invention is to ensure the possibility to change the number of tariffs during the operation of the equipment and to centrally change the tariff of the group users by automatically informing the user, to simplify and reduce the construction of the equipment.

This problem is solved by a variable-rate electricity pricing device, where price B is determined by the expression

B = _ai (A, + —A ₂ + ... + —Α + ....), where Ai ... Aj is the amount of energy consumed, a, ą - tariffs at time intervals, with single-rate electro-induction meters with a rate coefficient converter, in that the rate coefficient converter is a common voltage divider for all meters connected to the voltage winding of the meters by a tariff wire, which gives the condition U

U a / where U is the supply voltage,

- national coefficient.

A

This condition implies that the voltage to be used for expressing the respective power consumption rate is not the current, which is equivalent on the basis of the aforementioned relation of the meter disk torque M _s .

a voltage converter can be used to connect complex resistances connected to the applied voltage to satisfy the condition

A ₌ A ₌ A

R La / where R and L are the total impedance and inductance of the divider respectively,

Ri and Lj are the impedance and the inductance of the part of the wire, respectively.

Also, the voltage divider can be an autotransformer that satisfies the condition

A. _

A ' ^_ a,' where N is the number of windings of the autotransformer,

Nys - the number of windings connected to the tariff wire.

The meter rate indicators are connected to the tariff wire of the rate coefficient converter.

diagrams are provided to explain the device, where:

FIG. - the connection of the device to the single-phase power supply line is shown, FIG. - Voltage divider version.

the unit has electric meters 1 and a tariff coefficient converter 2. The current contacts 3 of the meters 1 are connected to the consumers V! and the V ₂ line circuit, and the voltage contacts 4 are connected to the output terminal 6 of the inverter 2 by the overhead wires 5.

When the unit is connected to the centralized power supply and tariff exchange system, the converter 2 is installed in the dispatcher and connected to it by the tariff wires 5 corresponding to the number of electricity counters 1. Converter 2 and counters 1 have rate indicators 7.

The purpose of the converter is performed by a voltage divider consisting of complex resistors Rt + L ,, R ₂ + L ₂ , Ri + U and a switch P, which can take positions 8, 9, 10 (Fig. 1).

the voltage converter may also be an autotransformer 11, as shown in FIG. 2, where N is the number of windings of the autotransformer, N, is the number of windings connected to the tariff wire 5.

When the electricity is supplied at the basic rate (the coefficient a ^, the switch P is set to position 10), then the meters 1 receive the total applied voltage U (the total impedance R of the divider R (Ri + R ^ R J and the inductance L (L ^^ + Li)). When power is supplied at a reduced rate (coefficient a ·,), the switch P is set to position 9 (active resistance R ₂ + R and inductance L ₂ + Lj) or 8 (active impedance Rj and inductance L,) and falls into the counters 1. times lower voltage, which is indicated with 7, and on the basis of the torque equation M _c, the rotation is slowed and the user paying a flat-rate! .sumoka the required price. 7 Using the indicator the user can adjust the time the cheapest energy.

Claims (4)

DEFINITION OF INVENTION 1. Price-fixing equipment for electricity at variable rates, in which price B is determined by the expression: B = ai (A ₁ + - A ₂ + ...- ^ - ą + ...), where Ai ... A - is the amount of energy consumed, a, ... a - tariffs at intervals with group tariffs electro-inductive meters with a tariff coefficient converter, characterized in that the coefficient converter has a common voltage divider for all meters with a voltage U = U ^, where U is the consumption voltage connected to the voltage windings of the meters. 2. A device for determining the price of electric energy at variable rates according to claim 1, characterized in that the voltage divider is made up of complex resistors satisfying the condition ^ L ₌ ^ L ₌ fi. 7? L a, 'where R and L are the total impedance and inductance of the divider, R, and L, the impedance and inductance of the part of the wire to be connected. 3. A device for pricing electricity at variable rates according to claim 1, characterized in that the voltage divider comprises an autotransformer satisfying the condition ₌ 5_. Well, 'where N is the number of windings of the autotransformer, Nj - number of wires to be connected to the tariff wire. 4. A device for pricing electricity at variable rates according to claims 1-3, wherein meter rate indicators are connected to the tariff wire of the rate coefficient converter.