CN201331547Y

CN201331547Y - Combined low-voltage carrier electric energy meter

Info

Publication number: CN201331547Y
Application number: CNU2008202269436U
Authority: CN
Inventors: 杨振敏; 苗兴东
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-15
Filing date: 2008-12-15
Publication date: 2009-10-21
Anticipated expiration: 2018-12-15

Abstract

The utility model discloses a combined low-voltage carrier electric energy meter, which belongs to the technical field of electric energy metering and remote monitoring. The combined low-voltage carrier electric energy meter comprises an electric energy meter, an electric carrier CPU terminal, an impedance setting filter and an improved earth leakage circuit-breaker, wherein the impedance setting filter is connected with a wire inlet terminal of the electric energy meter; and the improved earth leakage circuit-breaker is connected with a control output end of the electric carrier CPU terminal. The utility model has the advantages of low cost, convenient installation and use, real-time reliable electric carrier transmission capability and remote system RTU complete function.

Description

The combination type low voltage carrier electric energy meter

Technical field

The utility model relates to a kind of combination type low voltage power carrier electric energy meter, belongs to electric energy metrical and remote control technology field.

Technical background

In recent years; active demand along with electricity market; the remote meter reading technology has obtained fast development; the carrier wave meter remote meter reading pattern of taking production as the leading factor with domestic several big ammeter manufacturing enterprises has occupied than big market; so-called carrier wave meter is that microcontroller system and power line carrier transmitting-receiving module are contained in the electric energy meter that formation has the power line carrier communication ability in the electric energy meter; but; owing to have serious noise jamming and serious carrier wave impedance mismatching phenomenon on the low voltage electric network; they make the reliable and stable transmission of low voltage power line carrier become worldwide technological puzzle; so carrier-wave transmission stability of carrier wave meter; reliabilities etc. can not satisfy the demands; therefore; the carrier wave meter pattern can not realize that real time remote checks meter; more can't realize real-time remote monitoring; the combination type low voltage power carrier electric energy meter that the utility model relates to has guaranteed the real-time stabilization reliable transmission of power carrier by the impedance setting filtering technique; make earth leakage protective device have remote control function by transformation to the earth leakage protective device of routine; by the electronic electric energy meter watch core; the impedance setting wave filter, electric power carrier wave remote monitor terminal and improved earth leakage protective device be integrated into a multilist combination type low voltage carrier electric energy meter with whole telecontrol system RTU functions

Summary of the invention

At the deficiencies in the prior art, it is a kind of with low cost, easy to install that the utility model provides, and has real-time reliable power carrier transmittability and have the Full Featured combination type low voltage carrier electric energy meter of telecontrol system RTU.

A kind of combination type low voltage carrier electric energy meter; comprise electronic electric energy meter, power carrier terminal cpu, impedance setting wave filter with through improved earth leakage circuit-breaker; the impedance setting wave filter is connected on the end of incoming cables of electronic electric energy meter, is connected through the control output end of improved earth leakage circuit-breaker with the power carrier terminal cpu.

Described impedance setting wave filter is to set up a rejection filter and a low-pass filter on existing impedance setting device; Rejection filter is made up of capacitor and inductor connection in series-parallel, and low-pass filter is made up of capacitor; Rejection filter and low-pass filter are connected on impedance setting device two ends respectively, and are connected with the phase line of line of electric force.

Described is to increase a control coil on the sensing magnetic core at earth leakage circuit-breaker through improved earth leakage circuit-breaker, and this control coil is connected with the control output end of power carrier terminal cpu.

The C1=1 μ F of impedance setting wave filter is the power frequency isolation capacitance, C2 and L1 form parallel resonance, its resonance frequency is the power carrier frequency, C2, L1 parallel resonance one termination is received on the phase firewire behind the other end series connection C1 connecting to neutral line again and is formed rejector circuit, it has only carrier frequency is presented high impedance, the outer frequency of other band is Low ESR, L2, C3 forms antiresonant circuit, resonance frequency is a centre carrier frequency, be serially connected on the zero line, because so zero line often has big power current must satisfy the electric current demand by the line footpath of L2, for volume and the cost that reduces telefault adopts two measures, the one, under the requirement of satisfying resonance impedance on the parallel resonance parameter designing, strengthen the resonant capacitance amount as far as possible and reduce inductance value, the 2nd, add its structure of the number of turn that ferrite core further reduces coil as shown in Figure 2 to inductance L 2, with L2, the C3 resonant tank is serially connected in becomes the zero line trap on the zero line, C4, C5, the termination zero line trap of C6 go out end, the other end meets A respectively, B, three phase lines of C, since their capacitance all be 1 μ F to high frequent carrier frequency be Low ESR so that the carrier wave impedance of the signal power source contact of low pressure carrier wave terminal cpu remain and power line carrier characteristic impedance approximate match state, the impedance setting wave filter is the high frequency carrier of an effective filtering of pi filter energy from each side simultaneously, becomes the impedance setting filter network of a function admirable.

The improvement of earth leakage protective device is to add a winding L 3 again on the electric leakage sensing magnetic core of former earth leakage circuit-breaker; the control output line of the termination low pressure carrier wave terminal cpu of L3; the public ground of another termination; remodeling method as shown in Figure 3; connect the copper-manganese current sensor of electric energy meter watch core through the live wire of improved earth leakage protective device; zero line connects the zero line output terminal of impedance setting wave filter; the line of electric force output terminal live wire (7) of earth leakage protective device connects user's live wire; zero line connects user's zero line; through improved earth leakage protective device when transmission line of electricity have when electric leakage the live wire electric current and the L4 line of the unequal electricity leakage sensor of neutral line current induce signal; the unhook coil of earth leakage protection drives switch disconnects switch when signal reaches certain intensity; L4 can induce the disconnection of breaking off relations of signal driving switch equally when same control delivery outlet when the low pressure carrier wave terminal cpu loaded the AC signal of certain intensity to L3; so improved earth leakage circuit-breaker has possessed Long-distance Control; earth leakage protection; subscriber switch is shown the multi-functional of tail connection terminal.

The characteristics of combination type low voltage carrier electric energy meter are as follows

1, because so the transmission of power carrier of having adopted the impedance setting filtering technique to improve this carrier wave meter of environmental baseline of low-voltage power carrier transmission greatly is real-time, stable, reliably, it makes low-voltage powerline carrier communication can realize the communications platform of real-time remote monitoring fully as low voltage electric network, it is unstable thoroughly to have solved present low-voltage power carrier transmission, insecure global problem.

2, since the meter of combination type low voltage carrier electric energy meter to read be to remove to drive counter C by low pressure carrier wave terminal cpu metrical pulse output line again behind the electric pulse by the output of low pressure carrier wave terminal cpu copy reading electric energy meter metering module can thoroughly solve the power down protection problem, so the shortcoming that the power down meter that does not exist general electronic electric energy meter to cause because of no power down protection is read to be forbidden.

3, earth leakage protective device has not only kept original function but also has had remote monitoring function after transforming, and has saved the pilot relay that remote monitoring institute must have, and can also doublely do in combination simultaneously and show the tail connection terminal.

4, watchcase has been saved in the integrated design of combination, the table tail, and on-the-spot Installation and Debugging have been simplified in table case and supporting installation, make the outfit of equipment cost be significantly less than the cost of the complete installation of traditional carrier wave meter.

5, this combination type low voltage carrier wave meter adopts modular design fully, so module adopts plug-in unit connection maintenance and repair convenient and simple between module.

6, the combination type low voltage carrier electric energy meter adopts integrated sealing installation externally to have only table case input terminal and remove user's outlet terminal, has higher security and good anti-electricity-theft ability.

Description of drawings

Fig. 1 is an electrical schematic diagram of the present utility model.

Specific embodiments

Embodiment: a kind of combination type low voltage carrier electric energy meter; comprise electronic electric energy meter, power carrier terminal cpu, impedance setting wave filter with through improved earth leakage circuit-breaker; the impedance setting wave filter is connected on the end of incoming cables of electronic electric energy meter, is connected through the control output end of improved earth leakage circuit-breaker with the power carrier terminal cpu.

Claims

1. A combined low-voltage carrier watt-hour meter, characterized in that it includes an electronic watt-hour meter, a power carrier CPU terminal, an impedance setting filter and an improved leakage protection switch, and the impedance setting filter is connected to the incoming line end of the electronic watt-hour meter , the improved leakage protection switch is connected to the control output terminal of the power carrier CPU terminal.

2. The combined low-voltage carrier energy meter as claimed in claim 1, characterized in that, the impedance setting filter is to add a band-stop filter and a low-pass filter to the existing impedance adjuster; The stop filter is composed of capacitors and inductors connected in series and parallel, and the low-pass filter is composed of capacitors; the band stop filter and low-pass filter are respectively connected to both ends of the impedance adjuster and connected to the phase line of the power line.

3. The combined low-voltage carrier watt-hour meter according to claim 1, characterized in that, the improved leakage protection switch is to add a control coil on the sensing core of the leakage protection switch, and the control coil is connected with the power carrier The control output terminal connection of the CPU terminal.