RU2121758C1 - Low-voltage modem for providing communication among components of remote load control system - Google Patents

Abstract

FIELD: remote load control systems such as those controlling electric power consumption. SUBSTANCE: modem has low-voltage network with low- and high-voltage conductors using higher- order intellectual elements in system and lower- order elements connected to pair of low-voltage network conductors for predetermined number of possible connection pairs; in addition, it has network data receiving unit, unit transmitting data to network, and standard modem for electric network that establishes communication between transceiving units and higher-order intellectual elements. EFFECT: improved efficiency of communication in system provided expected subscribers have more than five (eight) conductors at their disposal. 3 cl, 2 dwg

Description

 The invention relates to a remote control system for the consumption of, for example, electricity, water, gas, etc., in which communication is via a low voltage line. Conventional power line modems fulfill their purpose if the BT low-voltage line (see symbols in Fig. 1) consists of three standard wires, the number of which can be increased to five: neutral (N), ground (T), phase 1 (F1) phase 2 (F2) and phase 3 (F3), and in this case they lose the power and efficiency of information transfer.

Typically, subscribers are connected between neutral (N) and phase (F), for example, 220 V. However, in rural areas and in old cities, other connection options can be used, provided that the power station leaves the transformer of the substation, except for three phases (F ₁ ), (F ₂ ) and (F ₃ ), three more phases (f ₁ ), (f ₂ ) and (f ₃ ), derivatives of the first. In this case, the connection between the neutral (N) and one of these phases (f) will provide a voltage of, for example, 127 V. Thus, under these conditions, the consumer has eight possible wires and, therefore, a regular modem is unsuitable for performing its functions.

 The aim of the present invention is the creation of a new modem that will provide effective communication in the system in the event that the intended subscribers will have at their disposal more than five, in particular eight wires.

 The invention is illustrated by drawings, which shows an example of its implementation, without imposing any restrictions and allowing some measurements of a non-fundamental nature.

 In FIG. 1 is a diagram of an eight-wire remote control system on a low voltage (BT) line and with a modem (M) turned on in accordance with the invention.

 In FIG. 2 is a block diagram of an embodiment of the aforementioned modem.

 Subscribers have corresponding tariff units UT for their consumption, connected, for example, in accordance with Fig. 1.

 Some UT tariff units are connected to the CF home meter hub.

 Consumption information is transmitted to the meter concentrator in the CCT transformation center, which in turn is connected to the corresponding processor of the system.

 A modem M made in accordance with the invention is installed between the low voltage line BT and the meter concentrator in the CCT transformation center.

In this case, take the following pairs of consumer connections: F ₁ -N, F ₂ -N, F ₃ -N, f ₁ -N, f ₂ -N, f ₃ -N, f ₁ -f ₂ , f ₁ -f ₃ , f ₂ -f ₃ , given that the invention includes other possible compounds, a different number of phases, or a combination of both.

For simplicity, suppose that phases F ₁ , F ₂ and F _{3 of} a higher voltage, for example 220 V, and phases f ₁ , f ₂ and f _{3 of a} lower voltage, for example, 127 V, each form a pair with neutral N.

 In the following discussion, the above pairs of compounds will be used.

 The modem M, made according to the invention, has an appropriate power source, which is not shown in the diagram.

A data receiving unit 1 is provided, in which for each pair of connections (for example, for the pair F ₁ -N there is a protection module, consisting, for example, of their varistor 2, discharge wire 3 in parallel with a series-connected capacitor 4; communication transformer 5 for galvanic isolation ; the module for eliminating interference 6, while the information is sent to the decoder / selector of channel 7, connected to a standard modem M _with electrical connection.

 There is also a unit for transmitting 8 information to the consumer from the system.

Theoretically, for each pair of connections (for the nine pairs mentioned), corresponding transmission elements between the standard modem M _with and the low-voltage line of the VT would be required, but this would be too expensive.

The applicant has determined that it is sufficient for each wire to receive a special signal. Of all the possible combinations and for practical reasons, the wires are grouped into the following groups:
1) N, F ₁ , F ₂ , F ₃ ;
2) f ₁ , f ₂ ;
3) f ₁ , f ₃ ;
4) f ₂ , f ₃ ;
Thus, only four output lines from a standard modem M _{s are} needed, which provides savings in relation to elements requiring amplification and isolation.

At the output of the standard modem M _with in the transmitting unit, for each group of wires in the transmission unit 8, an amplification / isolation unit 9 is provided, consisting of a power amplifier 10, a module for eliminating interference 11, a communication transformer 12 for galvanic isolation.

From the transformer 12 leaves the first wire to neutral N and the second wire, from which in turn three other wires go into three phases F ₁ , F ₂ , F _{3 of} a higher voltage.

For each pair of connections available in the transmitting unit 8, namely: F ₁ -N, F ₂ -N, F ₃ -N, f ₂ -f ₃ , f ₁ -f ₂ and f ₁ -N, a protection module is provided, consisting of a varistor 13, a gas discharge tube 14 and a capacitor 15.

 Thus, the system provides the transmission and reception of information at the proper level.

Due to the fact that the input / output device of the main hub CCT complies with the RS 232 serial interface standard, and the input / output device of the standard modem M _s uses transistor-transistor logic (TTL), a conversion interface 16 RS 232 / TTL is provided between them.

Claims (3)

 1. A low voltage modem for communication between elements of a remote consumption control system, consisting of a low voltage network with wires for higher and lower voltage, and including tariff units and air conditioners for household meters, connected to a pair of wires of a low voltage network with the formation of the required number of possible pairs of connections, counter concentrators in the transformation center and a system processor, characterized in that it comprises a unit for receiving data from the network, containing for each given pair of connections the sequentially connected network damage protection module, a communication transformer and an interference suppression module, the data receiving unit providing information to a decoder, an information transmitting unit to a network containing, for each predetermined group of wires for connecting to the network, a power amplifier connected in series, a elimination module interference, a communication transformer and a module for protection against damage to the network, a standard power supply modem designed to establish communication between the receiving and transmitting units and a concentrator of counters in the transformation center, the modem being configured to connect to groups of wires including neutral and each of the wires of higher voltage phases to form pairs of neutral – first phase, neutral – second phase, neutral – third phase, neutral and first wire phases of lower voltage, wires of the second phase and third phase of lower voltage, wires of the first phase and second phase of lower voltage.  2. The modem according to claim 1, characterized in that each module for protection against damage to the network of transceiver units contains, for each pair of connections, a varistor and a gas discharge tube with a capacitor connected in parallel.  3. The modem according to claim 1, characterized in that the connection between the modem and the concentrator of counters in the transformation center is provided by means of the RS 232 / TT conversion interface connected between them.

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