CN204536414U - A kind of low-voltage network residual current monitoring system - Google Patents

Abstract

The utility model provides a low-voltage distribution network residual current monitoring system, which includes a residual current energy meter that can be measured, a background monitoring server and a communication channel; the residual current energy meters that can be measured are arranged on the user side of the low-voltage distribution network, and each The residual current watt-hour meter is electrically connected to the background monitoring server with two-way signals through the communication channel; the communication channel adopts RS485 bus or power line carrier communication channel; Line current sampling resistors, residual current transformers and circuit devices. The utility model has the advantages of simple structure, cost saving, convenient installation, safety and reliability, and is easy to be popularized in a large area. It can effectively monitor and warn the user's residual current when in use, and can remotely control and cut off the user's current to prevent the occurrence of vicious events such as fires when necessary. Power supply security.

Description

A low-voltage distribution network residual current monitoring system

technical field

The utility model relates to the field of distribution networks, in particular to a low-voltage distribution network residual current monitoring system based on a measurable residual current electric energy meter.

Background technique

In today's society, electricity has become the most important energy source for human beings. With the rapid development of my country's economy, electric energy plays an increasingly important role in economic construction and people's daily life. However, while electric energy benefits people's lives, electrical fires also occur in large numbers, causing huge losses. my country's public security and firefighting agencies have investigated more than 260,000 electrical fires from 1996 to 2005, accounting for about 23.9% of the total number of fires. In electrical fires, a large part is caused by residual current. At the same time, the residual current may also cause personal electric shock, equipment damage and other accidents. For this reason, it is a common practice in countries all over the world to install residual current operated protectors (RCDs) in low-voltage power grids. However, the residual current protector can only perform tripping protection when the residual current exceeds the limit, and cannot perform early warning and real-time monitoring. In addition, the misoperation of the residual current protector has always been a confusing matter for the power supply department and users, which not only seriously affects the use effect of the protector, but also directly affects the reliability of the power supply. The reasons for the misoperation of residual current operated protectors are complex and diverse. These faults require the staff to go to the site to conduct door-to-door investigations, which consumes a lot of manpower and material resources, and the efficiency is very low.

Utility model content

The purpose of this utility model is to provide a low-voltage distribution network residual current monitoring system with simple structure, cost saving, convenient installation, safety and reliability. When it is used, it can effectively solve the real-time monitoring of user-side residual current in low-voltage distribution network problems and ensure the safety of power supply.

The technical solution of the utility model is: the residual current monitoring system of the low-voltage distribution network of the utility model, and its structural characteristics are: including a residual current electric energy meter, a background monitoring server and a communication channel;

Measurable residual current watt-hour meters are distributed and arranged on the user side of the low-voltage distribution network; each measurable residual current watt-hour meter is electrically connected to the background monitoring server with a two-way signal through a communication channel;

The above measurable residual current watt-hour meter includes a housing, a terminal block, a relay, a phase line current sampling resistor, a phase line, a neutral line, a residual current transformer and a circuit device; the terminal block includes a first connection terminal, a second connection terminal, the third terminal and the fourth terminal; the terminal block is fixedly installed on the shell; the relay, the phase line current sampling resistor, the phase line, the neutral line and the residual current transformer are all set in the shell; one end of the neutral line It is electrically connected to the third terminal; the other end of the neutral line is electrically connected to the fourth terminal; 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 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 arranged near the phase line and the neutral line, and the phase line and the neutral line pass through the residual current transformer; the circuit The device is electrically connected with the relay, the phase line current sampling resistor and the residual current transformer respectively.

A further solution is: the above-mentioned communication channel is an RS485 bus.

A further solution is: the above-mentioned communication channel is a power line carrier channel.

A further solution is: the above-mentioned circuit device capable of measuring residual current watt-hour meter 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, and an LCD display module , button module and power module;

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 and a power supply module 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 bidirectional signal of the communication terminal of the single-chip processing module; the external communication terminal of the communication module is connected with the above-mentioned The communication channel signal is electrically connected; the signal input end of the LCD display module is electrically connected with the display signal output end signal of the single-chip processing module; the signal output end of the key module is electrically connected with the key signal input end signal of the single-chip processing module; the power supply module provides working power .

The utility model has positive effects: (1) The residual current monitoring system of the low-voltage distribution network of the utility model is composed of a measurable residual current electric energy meter distributed on the user side, a communication channel and a background monitoring server, and has a simple structure and saves costs , Easy to install, safe and reliable, easy to promote in a large area. (2) The communication channel of the low-voltage distribution network residual current monitoring system of the present invention can adopt RS485 bus or power line carrier channel, which is convenient to implement and low in cost. (3) The residual current monitoring system of the low-voltage distribution network of the present utility model realizes real-time monitoring and recording of the residual current on the user side in the low-voltage distribution line through the measurable residual current electric energy meter when it is in use. The residual current over-limit event with the alarm threshold is set to alarm; all user-side residual current measurement data and records are uploaded to the background monitoring server through the RS485 bus or power line carrier channel, and the background monitoring server counts all user-side residual current events. Analysis, and finally early warning of residual current events on the user side, so as to prevent problems before they happen. If necessary, the background monitoring server can remotely control the relay action in the energy meter that can measure residual current to cut off the user's current to prevent fires and other vicious events. occurs to ensure the safety of power supply.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the electric energy meter capable of measuring residual current in Fig. 1, in which the housing omits the front cover and is not shown;

Fig. 3 is a schematic block diagram of the circuit structure of the electric energy meter capable of measuring residual current in Fig. 1 .

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

Measurable residual current watt-hour meter 101, 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 line 5, neutral line 6, residual current transformer 7, circuit device 8;

background monitoring server 102,

communication channel 103 .

Detailed ways

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

(example)

Referring to FIGS. 1 to 3 , the low-voltage distribution network residual current monitoring system of this embodiment is mainly composed of a residual current energy meter 101 , a background monitoring server 102 and a communication channel 103 .

Measurable residual current energy meters 101 are distributed and arranged on the user side of the low-voltage distribution network; each measurable residual current energy meter 101 is electrically connected to the background monitoring server 102 through a communication channel 103 for bidirectional signals.

Measurable residual current electric energy meter 101 is mainly composed of 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 device 8 .

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.

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, a button module 89 and The power module 80 is 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.

Measurable residual current watt-hour meter 101 and phase line current loop are composed of phase line current sampling resistor 4, relay 3 and phase line 5; phase line current flows in from the first terminal 21 of terminal block 2 and flows out from the second 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 The signal is obtained by the residual current sampling transformer 7.

(Application example)

The low-voltage distribution network residual current monitoring system of the aforementioned embodiment, when it is in use, when the measurable residual current watt-hour meter 101 separately located on each user side of the low-voltage distribution network is working, its phase line current sampling signal and residual current sampling signal are sent to To the circuit device 8, the phase line current signal is used for real-time power calculation, the residual current sampling signal is used for real-time monitoring of the residual current value of the user line, and the residual current value of the low-voltage power distribution line is regularly recorded. Once it is found that the residual current value in the user line exceeds the preset alarm threshold, the energy meter will immediately alarm the user, form a residual current over-limit alarm event record, and promptly notify the background monitoring through the communication channel 103 (RS485 bus or power line carrier channel) Server 102. The background monitoring server 102 reads the residual current records and over-limit alarm events of the measurable residual current electric energy meter 101 on the user side through the RS485 bus or the power line carrier channel, and performs statistical analysis on the residual current over-limit alarm events, and detects possible faults in the user circuit. The occurrence of excess current exceeding the limit is predicted, and a message is sent to the user's measurable residual current electric energy meter 101 through the communication channel 103, and the measurable residual current electric energy meter 101 gives an early warning to the user. When necessary, the background monitoring server 102 can remotely control the action of the relay 3 in the watt-hour meter 101 capable of measuring residual current, and cut off the user's current, so as to prevent the occurrence of vicious events such as fire.

The above embodiments and application examples are descriptions of specific implementations of the present utility model, rather than limitations of the present utility model. Those skilled in the relevant technical fields can also make various Therefore, all equivalent technical solutions should be included in the patent protection scope of the utility model.

Claims (4)

1. a low-voltage network residual current monitoring system, is characterized in that: comprise and can measure residual current electric energy meter (101), backstage monitor server (102) and communication channel (103);

The user side that residual current electric energy meter (101) distribution is arranged at low-voltage network can be measured; Respectively can measure residual current electric energy meter (101) to be electrically connected with backstage monitor server (102) two-way signaling by communication channel (103);

The described residual current measured electric energy meter (101) comprises housing (1), terminal block (2), relay (3), phase line current sampling resistor (4), phase line (5), zero line (6), residual current transformer (7) and circuit arrangement (8); 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); Relay (3), phase line current sampling resistor (4), phase line (5), zero line (6) and residual current transformer (7) are all 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); 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); Circuit arrangement (8) is electrically connected respectively with relay (3), phase line current sampling resistor (4) and residual current transformer (7).

2. low-voltage network residual current monitoring system according to claim 1, is characterized in that: described communication channel (103) is RS485 bus.

3. low-voltage network residual current monitoring system according to claim 1, is characterized in that: described communication channel (103) is voltage Power Line Carrier Channel.

4. low-voltage network residual current monitoring system according to claim 1, is characterized in that: the circuit arrangement (8) of the described residual current measured electric energy meter (101) 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);

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) 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 correspondence with foreign country end of communication module (87) is electrically connected with described communication channel (103) signal; 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.