CN204154810U - A kind of electric energy meter measuring residual current - Google Patents

Abstract

The utility model provides an electric energy meter capable of measuring residual current, which comprises a shell, a terminal block, a phase wire, a neutral wire, a relay, a phase wire current sampling resistor, a residual current transformer and a circuit device; a relay, a phase wire current sampling Both the resistance and the residual current transformer are set in the casing; the phase line and the neutral line pass through the residual current transformer; the circuit device includes a voltage sampling module, a signal processing module, an A/D conversion module, an electric energy measurement module, a single-chip processing module, and a relay Control module, communication module, LCD display module, key module and power supply module. The utility model can realize real-time measurement and recording of the residual current in the user line, and has the function of alarm event and event recording of the excess current of the residual current; the utility model only needs to improve the existing smart meter, and the improvement cost is not high , and does not affect the functions and dimensions of the existing electric energy meters, which is convenient for large-scale promotion.

Description

An electric energy meter capable of measuring residual current

technical field

The utility model relates to an intelligent electric energy meter, in particular to an electric energy meter capable of measuring residual current.

Background technique

Residual current refers to the current in which the vector sum of the current vectors of each phase in the distribution line is not zero. In most cases, it is caused by the leakage of equipment or lines. When the leakage is serious, it will burn the electrical equipment or lines and cause a fire. Therefore, it is an effective protective measure to prevent personal electric shock, electrical fire and electrical equipment damage by residual current detection and installation of residual current operating protectors in low-voltage power grids. Countries around the world and the International Electrotechnical Commission have vigorously promoted the use of residual current-operated protectors in low-voltage power grids by formulating corresponding electrical installation regulations and electricity utilization regulations. However, the residual current protector can only perform trip protection when the residual current exceeds the limit fault, and cannot perform early warning and real-time monitoring.

Although the current electric energy meters can measure the phase line current and the neutral line current, they do not have the measurement function of residual current. The Chinese patent document with the application number 200420018274.5 and the name "Single-phase Electronic Leakage Detection Smart Energy Meter" discloses an electric energy meter that can detect and identify leakage current, but the electric energy meter cannot detect the leakage current value. Real-time measurement, and the leakage current in the user line cannot be recorded.

Utility model content

The purpose of the utility model is: in order to solve the problem of real-time measurement of the residual current in the user line, the utility model provides an electric energy meter that can perform real-time measurement, early warning and alarm functions of the residual current on the user side, and has the advantages of cost saving, installation It is convenient and can be popularized in a large area.

The technical solution of the utility model is: the electric energy meter capable of measuring residual current of the utility model includes a housing, a terminal block, a phase line, and a neutral line; the above-mentioned terminal block includes a first connecting terminal, a second connecting terminal, The third terminal and the fourth terminal; the terminal base is fixedly installed on the shell; the phase line and the neutral line are installed in the shell; one end of the neutral line is electrically connected to the third terminal; the other end of the neutral line is connected to the fourth terminal Terminals for electrical connection; its structural features are: it also includes relays, phase line current sampling resistors, residual current transformers and circuit devices;

The above-mentioned relays, phase line current sampling resistors and residual current transformers are all arranged in the casing;

One end of the phase line current sampling resistor is electrically connected to the first terminal; the other end of the phase line current sampling resistor is electrically connected to the relay; one end of the phase line is electrically connected to the second terminal; the other end of the phase line is electrically connected to the relay; The residual current transformer is set close to the phase line and the neutral line, and the phase line and the neutral line pass through the residual current transformer;

The above-mentioned circuit device includes a voltage sampling module, a signal processing module, an A/D conversion module, an electric energy metering module, a single-chip microcomputer processing module, a relay control module, a communication module, an LCD display module, a button module and a power supply module;

The voltage sampling module, signal processing module, A/D conversion module, electric energy metering module, single-chip microcomputer processing module, relay control module, communication module and power supply module of the circuit device are arranged in the casing;

The voltage sampling module is provided with a signal output terminal; the signal processing module is provided with a voltage sampling signal input terminal, a phase line current sampling signal input terminal, a residual current signal input terminal and a signal output terminal; the A/D conversion module is provided with a signal input terminal, a second A signal output terminal and a second signal output terminal; the electric energy metering module is provided with a signal input terminal and a signal output terminal; the single-chip processing module is provided with a sampling signal input terminal, a power consumption signal input terminal, a relay control signal output terminal, a communication terminal, The display signal output terminal and the button signal input terminal; the relay control module has a signal input terminal and a control signal output terminal; the communication module has an internal communication terminal and an external communication terminal; the LCD display module has a signal input terminal; the key module has a signal output;

The voltage sampling signal input terminal, the phase line current sampling signal input terminal and the residual current signal input terminal of the signal processing module are respectively electrically connected to the signal output terminal of the voltage sampling module, the phase line current sampling resistor and the residual current transformer; A/D The signal input end of the conversion module is electrically connected with the signal output end of the signal processing module; the signal input end of the electric energy metering module is electrically connected with the first signal output end signal of the A/D conversion module; the sampling signal input end of the single-chip processing module is connected with the A The second signal output terminal signal of the /D conversion module is electrically connected; the power consumption signal input terminal of the single-chip processing module is electrically connected with the signal output terminal signal of the electric energy metering module; the signal input terminal of the relay control module is connected with the relay control signal of the single-chip processing module The output terminal signal is electrically connected; the control signal output terminal of the relay control module is electrically connected with the control terminal of the relay; the internal communication terminal of the communication module is electrically connected with the communication terminal of the single-chip processing module for two-way signal; the signal input terminal of the LCD display module is connected with the single-chip computer The display signal output terminal of the processing module is electrically connected to the signal; the signal output terminal of the button module is electrically connected to the signal input terminal of the button signal of the single-chip processing module; the power supply module provides working power.

The communication module of the above-mentioned circuit device includes an infrared communication interface, an RS485 communication interface and a carrier communication interface; the infrared communication interface, the RS485 communication interface and the carrier communication interface are respectively provided with an internal communication terminal and an external communication terminal; Together with the internal communication terminal of the carrier communication interface, the internal communication terminal of the above-mentioned communication module is formed; the external communication terminal of the infrared communication interface, the RS485 communication interface and the carrier communication interface together constitute the external communication terminal of the above-mentioned communication module.

The LCD display module of the above-mentioned circuit device includes an LCD display installed on the housing for displaying power consumption, real-time residual current value, and alarm information when the residual current exceeds the limit; the key module includes an LCD display installed on the housing for users to consult information interaction key used.

A further solution is: the above-mentioned relay is a JML82 type magnetically latched relay; the residual current transformer is a HLTY1 type current transformer; the phase line current sampling resistor is a manganese copper sampling resistor.

The utility model has positive effects: (1) The energy meter capable of measuring residual current of the utility model can realize real-time measurement and recording of the residual current in the user line, and when the detected residual current exceeds the preset alarm threshold It can automatically alarm when the time comes, and form a residual current over-limit alarm event record; all residual current measurement data and records can be uploaded to the data acquisition system of the monitoring background through RS485, carrier wave and other communication interfaces, and the monitoring background will monitor the residual current events of all users Carry out statistical analysis, and finally give early warning to the user's residual current event. (2) The electric energy meter capable of measuring residual current of the present utility model is improved on the existing smart electric meter, and the improvement cost is not high, and does not affect the functions and external dimensions of the existing electric energy meter, which is convenient for large-scale promotion.

Description of drawings

Fig. 1 is the structural representation of the present utility model, and among the figure housing omits front cover and does not draw;

Fig. 2 is a schematic block diagram of the circuit structure of the utility model.

The reference signs in the above-mentioned accompanying drawings are as follows:

housing 1,

Terminal block 2, first terminal 21, second terminal 22, third terminal 23, fourth terminal 24,

relay 3,

Phase wire current sampling resistor 4,

phase wire 5,

neutral line 6,

residual current transformer 7,

Circuit device 8, voltage sampling module 81, signal processing module 82, A/D conversion module 83, electric energy metering module 84, single-chip microcomputer processing module 85, relay control module 86, communication module 87, LCD display module 88, button module 89, power supply Module 80.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

(Example 1)

See Fig. 1, the energy meter capable of measuring residual current in this embodiment, housing 1, terminal block 2, relay 3, phase line current sampling resistor 4, phase line 5, neutral line 6, residual current transformer 7 and circuit The device 8 is composed.

The connection terminal block 2 includes a first connection terminal 21 , a second connection terminal 22 , a third connection terminal 23 and a fourth connection terminal 24 .

The relay 3 is fixedly arranged in the casing 1 . In this embodiment, the relay 3 preferably adopts a JML82 type magnetic latching relay.

The phase line current sampling resistor 4 is arranged in the casing 1 . The phase line current sampling resistor 4 is preferably a manganese copper sampling resistor in this embodiment. One end of the phase line current sampling resistor 4 is electrically connected to the first connection terminal 21 ; the other end of the phase line current sampling resistor 4 is electrically connected to the relay 3 .

The phase line 5 , the neutral line 6 and the residual current transformer 7 are all arranged in the casing 1 .

One end of the phase line 5 is electrically connected to the second terminal 22 ; the other end of the phase line 5 is electrically connected to the relay 3 .

One end of the neutral wire 6 is electrically connected to the third connection terminal 23 ; the other end of the neutral wire 6 is electrically connected to the fourth connection terminal 24 . The zero line 6 is close to the phase line 5 in the housing 1, and the position where the zero line 6 is close to the phase line 5 is bent into a square shape, which is used to ensure that the residual current transformer 7 can correctly sample the user line when the ammeter is normally connected. in the residual current.

The residual current transformer 7 is arranged near the phase line 5 and the neutral line 6 , and the phase line 5 and the neutral line 6 pass through the residual current transformer 7 . In this embodiment, the residual current transformer 7 is preferably a HLTY1 type current transformer.

Referring to Fig. 2, the circuit device 8 is mainly composed of a voltage sampling module 81, a signal processing module 82, an A/D conversion module 83, an electric energy metering module 84, a single chip processing module 85, a relay control module 86, a communication module 87, an LCD display module 88, The button module 89 and the power module 80 are composed.

The voltage sampling module 81 , signal processing module 82 , A/D conversion module 83 , electric energy metering module 84 , single chip processing module 85 , relay control module 86 , communication module 87 and power supply module 80 of the circuit device 8 are arranged in the housing 1 .

The voltage sampling module 81 is provided with a signal output terminal; the signal processing module 82 is provided with a voltage sampling signal input terminal, a phase wire current sampling signal input terminal, a residual current signal input terminal and a signal output terminal; the A/D conversion module 83 is provided with a signal input terminal terminal, the first signal output terminal and the second signal output terminal; the electric energy metering module 84 is provided with a signal input terminal and a signal output terminal; the single-chip processing module 85 is provided with a sampling signal input terminal, a power consumption signal input terminal, and a relay control signal output terminal, communication terminal, display signal output terminal and button signal input terminal; relay control module 86 is provided with signal input terminal and control signal output terminal; communication module 87 is provided with internal communication terminal and external communication terminal; LCD display module 88 is provided with Signal input terminal; the button module 89 is provided with a signal output terminal.

The voltage sampling signal input terminal, the phase line current sampling signal input terminal and the residual current signal input terminal of the signal processing module 82 are respectively electrically connected to the signal output terminal of the voltage sampling module 81, the phase line current sampling resistor 4 and the residual current transformer 7 The signal input end of the A/D conversion module 83 is electrically connected with the signal output end of the signal processing module 82; the signal input end of the electric energy metering module 84 is electrically connected with the first signal output end signal of the A/D conversion module 83; The sampling signal input end of the module 85 is electrically connected with the second signal output end signal of the A/D conversion module 83; the power consumption signal input end of the single-chip processing module 85 is electrically connected with the signal output end signal of the electric energy metering module 84; the relay control module The signal input terminal of 86 is electrically connected with the relay control signal output terminal signal of the single-chip processing module 85; the control signal output terminal of the relay control module 86 is electrically connected with the control terminal of the relay 3; the internal communication terminal of the communication module 87 is connected with the single-chip processing module The communication end bidirectional signal of 85 is electrically connected; The external communication end of communication module 87 communicates with monitoring background when using; The signal input end of LCD display module 88 is electrically connected with the display signal output end signal of single-chip processing module 85; The output end is electrically connected to the key signal input end of the single-chip processing module 85; the power supply module 80 provides working power for the electric energy meter.

The LCD display module 88 of the circuit device 8 includes an LCD display installed on the casing 1 ; the button module 89 includes buttons installed on the casing 1 . The LCD display of the LCD display module 88 is used for displaying the power consumption of the user and displaying the alarm information when the remaining current exceeds the limit during normal operation. The buttons on the button module 89 are used for the power user to check the electricity consumption information and interact with the electric energy meter.

In this embodiment, the communication module 87 preferably includes an infrared communication interface, an RS485 communication interface and a carrier communication interface. The infrared communication interface, the RS485 communication interface and the carrier communication interface are respectively provided with an internal communication terminal and an external communication terminal; the internal communication terminals of the infrared communication interface, the RS485 communication interface and the carrier communication interface together constitute the internal communication of the aforementioned communication module 87 The external communication terminal of the infrared communication interface, the RS485 communication interface and the carrier communication interface together constitute the external communication terminal of the aforementioned communication module 87. The infrared communication interface of the communication module 87 is used for the staff to set parameters and read the data in the table on site. RS485 communication interface and carrier communication interface are mainly used to communicate with the monitoring background of the power supply department.

The working principle and working process of the electric energy meter capable of measuring residual current in this embodiment are briefly described as follows:

The electric energy meter of the present embodiment that can measure the residual current, when it is in use, the phase line current loop is made up of the phase line current sampling resistor 4, the relay 3 and the phase line 5; Inflow and outflow from the second connection terminal 22; the phase line current signal is obtained from the phase line current sampling resistor 4.

The neutral line current loop is composed of the neutral line 6 , the neutral line current flows in from the fourth terminal 24 of the terminal block 2 , and flows out from the third terminal 23 .

The residual current signal is obtained by the residual current sampling transformer 7 .

Grid voltage sampling and power consumption calculation are the existing technology of the existing electric energy meter.

The grid voltage sampling signal, phase line current sampling signal, and residual current sampling signal are sent to the signal processing module 82 of the circuit device 8 for amplification and processing, and then converted into corresponding digital signals by the A/D conversion module 83, and sent to the power metering module 84 all the way. Perform real-time power calculations. The single-chip processing module 85 receives information such as the grid voltage value, phase line current value, residual current value, grid frequency, power factor, and power consumption uploaded by the A/D conversion module 83 and the electric energy metering module 84 in real time; Line current value, residual current value, power grid frequency, power factor and other parameters to calculate the zero line current value for the monitoring background to judge whether the user is using electricity normally and whether there is electricity theft. The single-chip processing module 85 stores the grid voltage, phase line current, neutral line current, residual current, power consumption and other information and sends them to the LCD display screen of the LCD display module 88 for real-time display. The interface is sent to the monitoring background power supply and consumption information collection system for statistical analysis; at the same time, the single-chip processing module 85 compares the real-time residual current value on the user line with the preset residual current alarm threshold: if the real-time residual current value exceeds the preset alarm threshold, the LCD display module 88 will alarm the user through the LCD display module 88, and actively report to the monitoring background through the carrier communication interface or RS485 communication interface; at the same time, record the residual current over-limit alarm event to monitor Statistical query is performed in the background. The monitoring background can predict the residual current exceeding the limit that may occur in the user's circuit through the statistical analysis of the remaining current exceeding the alarm event, and send information to the user's electric energy meter through the carrier communication interface or RS485 communication interface, and the electric energy meter sends to Users are warned in advance. When necessary, the monitoring background can remotely control the relay 3 to cut off the user's power supply through the circuit device 8, so as to prevent the occurrence of vicious events such as fire.

To sum up, the energy meter capable of measuring residual current in this embodiment can realize real-time measurement and recording of residual current in user lines, and can automatically alarm when the detected residual current exceeds the preset alarm threshold, and form a residual current Current over-limit alarm event record; all residual current measurement data and records can be uploaded to the data acquisition system in the monitoring background through RS485, carrier and other communication interfaces, and the monitoring background will perform statistical analysis on the residual current events of all users, and finally report to the user Early warning of residual current events; moreover, it only needs to be improved on the existing smart meters, the improvement cost is not high, and it does not affect the functions and dimensions of the existing electric energy meters, which is convenient for large-scale promotion.

The above embodiments are descriptions of specific implementations of the present utility model, rather than limitations of the present utility model. Those skilled in the art can also make various transformations and changes without departing from the spirit and scope of the present utility model. Changes to obtain corresponding equivalent technical solutions, so all equivalent technical solutions should be included in the patent protection scope of the present utility model.

Claims (2)

1. an electric energy meter for residual current be can measure, housing (1), terminal block (2), phase line (5), zero line (6) comprised; Described terminal block (2) comprises the first connection terminal (21), the second connection terminal (22), the 3rd connection terminal (23) and the 4th connection terminal (24); Terminal block (2) is fixedly mounted on housing (1); Phase line (5) and zero line (6) are arranged in housing (1); One end of zero line (6) is electrically connected with the 3rd connection terminal (23); The other end of zero line (6) is electrically connected with the 4th connection terminal (24); It is characterized in that: also comprise relay (3), phase line current sampling resistor (4), residual current transformer (7) and circuit arrangement (8);

Described relay (3), phase line current sampling resistor (4) and residual current transformer (7) are all arranged in housing (1);

One end of phase line current sampling resistor (4) is electrically connected with the first connection terminal (21); The other end of phase line current sampling resistor (4) is electrically connected with relay (3); One end of phase line (5) is electrically connected with the second connection terminal (22); The other end of phase line (5) is electrically connected with relay (3); Residual current transformer (7) is arranged at phase line (5) with zero line (6) mutually near place, and phase line (5) and zero line (6) are through residual current transformer (7);

Described circuit arrangement (8) comprises voltage sample module (81), signal processing module (82), A/D modular converter (83), electric energy metering module (84), single chip processing module (85), relay control module (86), communication module (87), LCD display module (88), key-press module (89) and power module (80);

The voltage sample module (81) of circuit arrangement (8), signal processing module (82), A/D modular converter (83), electric energy metering module (84), single chip processing module (85), relay control module (86), communication module (87) and power module (80) are arranged in housing (1);

Voltage sample module (81) is provided with signal output part; Signal processing module (82) is provided with voltage sampling signal input end, phase line current sampled signal input end, residual current signal input part and signal output part; A/D modular converter (83) is provided with signal input part, the first signal output part and secondary signal output terminal; Electric energy metering module (84) is provided with signal input part and signal output part; Single chip processing module (85) is provided with sampled signal input end, power consumption signal input end, relay control signal output terminal, communication ends, display output terminal and push button signalling input end; Relay control module (86) is provided with signal input part and control signal output terminal; Communication module (87) is provided with internal communication ends and correspondence with foreign country end; LCD display module (88) is provided with signal input part; Key-press module (89) is provided with signal output part;

The voltage sampling signal input end of signal processing module (82), phase line current sampled signal input end and residual current signal input part are respectively with signal output part, the phase line current sampling resistor (4) of voltage sample module (81) with residual current transformer (7) is corresponding is electrically connected; The signal input part of A/D modular converter (83) is electrically connected with the signal output part of signal processing module (82); The signal input part of electric energy metering module (84) is electrically connected with the first signal output part signal of A/D modular converter (83); The sampled signal input end of single chip processing module (85) is electrically connected with the secondary signal output end signal of A/D modular converter (83); The power consumption signal input end of single chip processing module (85) is electrically connected with electric energy metering module (84) signal output part signal; The signal input part of relay control module (86) is electrically connected with the relay control signal output end signal of single chip processing module (85); The control signal output terminal of relay control module (86) is electrically connected with the control end of relay (3); The internal communication ends of communication module (87) is electrically connected with the communication ends two-way signaling of single chip processing module (85); The signal input part of LCD display module (88) is electrically connected with the display output end signal of single chip processing module (85); The signal output part of key-press module (89) is electrically connected with the push button signalling input end signal of single chip processing module (85); Power module (80) provides working power;

The communication module (87) of described circuit arrangement (8) comprises infrared communication interface, RS485 communication interface and carrier communication interface; Infrared communication interface, RS485 communication interface and carrier communication interface are respectively equipped with internal communication ends and correspondence with foreign country end; The internal communication ends of infrared communication interface, RS485 communication interface and carrier communication interface forms the internal communication ends of described communication module (87) jointly; The correspondence with foreign country end of infrared communication interface, RS485 communication interface and carrier communication interface forms the correspondence with foreign country end of described communication module (87) jointly;

The LCD display module (88) of described circuit arrangement (8) comprises being arranged on housing (1) to transfinite the LCD display of alarm information for showing power consumption, in real time residual electricity flow valuve and residual current; Key-press module (89) comprises the button being arranged on and housing (1) being consulted information interaction for user.

2. the electric energy meter measuring residual current according to claim 1, is characterized in that: the relay that described relay (3) keeps for JML82 type magnetic; Residual current transformer (7) is HLTY1 type current transformer; Phase line current sampling resistor (4) is copper-manganese sampling resistor.