CN206788283U - A kind of low-voltage electrical safety monitoring assembly based on power line carrier transmission - Google Patents

Abstract

The utility model relates to a low-voltage electrical safety monitoring device based on power line carrier transmission, which is used for safety monitoring of a low-voltage electrical system. The device includes a monitoring terminal for monitoring each section of low-voltage lines, a concentrator connected to the signal output end of the monitoring terminal, A remote monitoring station connected to the signal output end of the concentrator. The concentrator includes a wireless RF module and a power carrier module. The concentrator uses the wireless RF module to connect to the monitoring terminal. The concentrator uses the power carrier module to connect to the remote monitoring station. , the monitoring terminal monitors the operation status of each section of the line, and transmits the monitoring information to the concentrator, and the concentrator transmits the information to the remote monitoring station by means of the power carrier module and the original power line, so that each section of the line can be realized without rewiring real-time monitoring.

Description

A low-voltage electrical safety monitoring device based on power line carrier transmission

technical field

The utility model relates to an electrical safety monitoring device, in particular to a low-voltage electrical safety monitoring device based on power line carrier transmission.

Background technique

With the development of the economy and the increase of electricity consumption, safety accidents in the low-voltage electrical system occur from time to time. In most cases, the temperature rises due to the long-term operation of electrical equipment and lines, short-circuit, overload, leakage and other abnormalities. , and cannot be repaired in time, igniting the surrounding combustibles, causing major accidents such as fire or explosion, endangering production and life and property safety, and causing heavy social and economic losses to life and production. Become the foundation of the reliability of the low-voltage electrical system.

In recent years, domestic and foreign enterprises have adopted early warning of electrical faults by monitoring leakage current and power connector temperature; or installed leakage current or arc fault protection devices on electrical switches and equipment to act in time when electrical faults occur to avoid the spread of accidents . Most of the products in the above methods are installed near the switchgear or knife switch, some operate independently, the monitoring parameters are single, and regional monitoring cannot be realized; some are connected into a system through the bus, and the low-voltage electrical system that has been in operation needs to re-arrange the communication bus to use.

Utility model content

In order to solve the above technical problems, the utility model provides a low-voltage electrical safety monitoring device based on power line carrier transmission, which can monitor faults without rewiring, and realize the safe operation of low-voltage electrical in the monitoring area.

The technical solution adopted by the utility model is: a low-voltage electrical safety monitoring device based on power line carrier transmission, which is used for safety monitoring of low-voltage electrical systems. A concentrator connected to the signal output end, and a remote monitoring station connected to the signal output end of the concentrator. The concentrator includes a wireless RF module and a power carrier module. The concentrator uses the wireless RF module to perform signal connection with the monitoring terminal. The concentrator uses The power carrier module performs signal connection with the remote monitoring station.

Preferably, the monitoring terminal includes a current transformer, a leakage current transformer, a voltage transformer, a temperature sensor, a current and voltage acquisition unit, a central processing unit, the signal output terminal of the current transformer, the leakage current transformer The signal output end of the signal output terminal and the voltage transformer are respectively connected to the signal input end of the current and voltage acquisition unit, and the signal output end of the current and voltage acquisition unit and the signal output end of the temperature sensor are respectively connected to the signal receiving end of the central processing unit Connection, the signal output end of the central processing unit is connected with the signal receiving end of the concentrator.

Preferably, the concentrator includes at least one sub-concentrator, and the sub-concentrators are sequentially connected along the signal transmission direction.

The beneficial effect of the utility model is: to carry out effective safety assessment and fault diagnosis on the electrical nodes of the low-voltage line, the temperature of the line, the load current, the leakage current, the fault arc and other operating information, realize real-time online data collection and record, and improve the reliability of power supply ;The collected data is contrasted and hierarchical, and can determine the power supply line of each section; these status data are sent to the remote monitoring station for analysis and confirmation, which can quickly evaluate electrical defects or faulty sections, and greatly improve the maintenance efficiency. Relying on the wireless RF communication module, it centrally monitors the operation safety information of the low-voltage line electrical nodes in the area, and transmits data through the power carrier module, which solves the shortcomings of existing low-voltage electrical monitoring products, reduces the problem of rewiring, and greatly improves The resource is saved, and the operating efficiency is improved; the low-voltage electrical fault detection efficiency and early warning timeliness are improved.

Description of drawings

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

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

In the accompanying drawings, 1. Monitoring terminal, 2. Concentrator, 3. Remote monitoring station, 4. Current transformer, 5. Leakage current transformer, 6. Temperature sensor, 7. Voltage and current acquisition unit, 8. Central processing unit , 9, wireless RF module, 10, power carrier module, 11, voltage transformer.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

The utility model relates to a low-voltage electrical safety monitoring device based on power line carrier transmission, which is used for the safety monitoring of low-voltage electrical systems. The connected concentrator 2, the remote monitoring station 3 connected with the signal output end of the concentrator 2, the concentrator 2 includes a wireless RF module 9, a power carrier module 10, and the concentrator 2 communicates with the monitoring terminal 1 by means of the wireless RF module 9. Signal connection, the concentrator 2 carries out signal connection with the remote monitoring station 3 by means of the power carrier module 10 relying on the existing power line, relies on the wireless RF module 9, centrally monitors the operation safety information of each section of the line node in the area, and passes the power carrier module 10 Relying on the existing power line to transmit data, it solves the shortcomings of existing low-voltage electrical monitoring products, reduces the problem of rewiring, greatly saves resources, and improves operating efficiency; improves the detection efficiency and early warning timeliness of low-voltage electrical faults sex.

The monitoring terminal 1 includes a current transformer 4, a leakage current transformer 5, a voltage transformer 11, a temperature sensor 6, a current and voltage acquisition unit 7, and a central processing unit 8, and the current transformer 4 is installed in a low-voltage line switch. On the outlet side, the live wire of the low-voltage line is covered with an open structure; the leakage current transformer 5 is installed on the load side of the low-voltage line, and the live wire and neutral line of the low-voltage line are surrounded by an open structure; the temperature sensor 6 is installed on the load side of the low-voltage line Side, with a patch structure close to the surface of the live wire of each phase voltage line; the signal output end of the current transformer 4, the signal output end of the leakage current transformer 5, and the signal output end of the voltage transformer 11 are respectively connected with the current and voltage The signal input end of acquisition unit 7 is connected, and the signal output end of described current and voltage acquisition unit 7, the signal output end of temperature sensor 6 are respectively connected with the signal receiving end of central processing unit 8, and the signal output end of central processing unit 8 is connected with The signal receiving end of the concentrator 2 is connected, which can conduct effective safety assessment and fault diagnosis on low-voltage electrical nodes, line temperature, load current, leakage current, fault arc and other operating information, realize real-time online data collection and record, and improve power supply reliability ;The collected data is contrasted and layered, and can determine the power supply line of each section; these status data are sent to the remote monitoring station for analysis and confirmation, which can quickly evaluate electrical defects or faulty sections, and greatly improve the maintenance efficiency. The central processing unit 8 is an ARM processor.

The concentrator 2 includes at least one sub-concentrator, and the sub-concentrators are sequentially connected along the signal transmission direction. Since the transmission distance of the power carrier is relatively short, multiple sub-concentrators are used to transmit information when the area is wide.

The concentrator also includes a microprocessor unit and a communication interface circuit; the wireless RF module 9 is connected to the SPI interface of the microprocessor unit; the power carrier module 10 is connected to the USART interface of the microprocessor; The other USART interface is connected to the communication interface circuit.

The voltage and current acquisition unit 11 includes a current acquisition circuit and a voltage acquisition circuit; the current acquisition circuit includes a current signal input terminal Iin, resistors R1-R5, capacitors C1, C2 and an operational amplifier K; the current signal input terminal Iin is passed through The resistor R3 is connected to the inverting input terminal of the operational amplifier K; the capacitor C2 is connected in parallel with the resistor R5 and connected between the inverting input terminal of the operational amplifier K and the output terminal; the non-inverting input terminal of the operational amplifier K is connected through The resistor R4 is grounded; the output terminal of the operational amplifier K is connected to the analog input terminal AIN1 of the ARM processor.

The voltage measurement circuit includes resistors R6-R7 and a voltage conversion module CT; the voltage signal is connected to the input terminal of the voltage conversion module CT through a resistor R7; the resistor R7 is connected between the two output terminals of the voltage conversion module CT; One output terminal of the voltage conversion module CT is connected to the analog input terminal AIN2 of the ARM processor, and the other output terminal is grounded.

The model of the current transformer is HFCT100; the model of the leakage current transformer is HFCT100; the model of the voltage transformer is EE2010; the model of the temperature sensor is DS1820; the model of the voltage conversion module CT is ZMPT107; the model of the operational amplifier K2 is LM324; the model of the ARM processor is STM32F373.

A method for realizing monitoring by a low-voltage electrical safety monitoring device includes the following steps:

(1) monitoring terminal 1 is powered on and initialized;

(2) The central processing unit in the monitoring terminal 1 reads temperature data, leakage current data, three-phase voltage data, and three-phase current data respectively;

(3) CPU 8 judges whether the temperature data exceeds the preset alarm threshold; if it exceeds the preset alarm threshold, enter step (3-1); otherwise go to step (4);

(3-1) The central processing unit 8 outputs over-temperature alarm information and transmits it to the concentrator 2 through the wireless RF module 9, and then transmits it to the remote monitoring station 3 through the power carrier module 10;

(4) CPU 8 judges whether the leakage current data exceeds the preset alarm threshold; if it exceeds the preset alarm threshold, enter the first (4-1); otherwise go to step (5);

(4-1) The central processing unit 8 outputs leakage alarm information and transmits it to the concentrator 2 through the wireless RF module 9, and then transmits it to the remote monitoring station 3 through the power carrier module 10;

(5) Select a periodic current signal from the central processing unit 8 of the monitoring terminal 1, and utilize the FFT algorithm to extract the effective value of the current;

(5-1) Judging whether the current data is an ultra-short-circuit current limit value; if the ultra-short-circuit current limit value, enter step (5-2); otherwise, go to step (6);

(5-2) select the voltage data from the central processing unit 8 of the monitoring terminal 1 with a delay, and judge whether the voltage data is zero, if so, enter step (5-3); otherwise go to step (6);

(5-3) The central processing unit 8 outputs short-circuit alarm information and is delivered to the concentrator 2 through the wireless RF module 9, and then delivered to the remote monitoring station 3 by the power carrier module 10;

(6) CPU 8 judges whether the current data exceeds the load current limit value; if it exceeds the load current limit value, enter step (6-1); otherwise go to step (7);

(6-1) The central processing unit 8 outputs the overload alarm information and transmits it to the concentrator 2 through the wireless RF module 9, and then transmits it to the remote monitoring station 3 through the power carrier module 10;

(7) Select the current data of one cycle from the central processing unit 8 of the monitoring terminal 1, and utilize the wavelet algorithm to extract the odd harmonic energy value;

(7-1) Judging whether the odd harmonic energy value exceeds the fault arc limit value; if it exceeds the fault arc limit value, enter step (7-2); otherwise go to step (2);

(7-2) The central processing unit 8 outputs the arc fault alarm information and transmits it to the concentrator 2 through the wireless RF module 9, and then transmits it to the remote monitoring station 3 through the power carrier module 10;

(7-3) Go to step (2).

Claims (3)

1. a kind of low-voltage electrical safety monitoring assembly based on power line carrier transmission, the safety for low-voltage electric system is supervised Survey, it is characterised in that：The device includes the monitoring terminal (1) of each section of low-voltage circuit of monitoring, the signal output with monitoring terminal (1) Hold concentrator (2), the remote supervisory station (3) being connected with the signal output part of concentrator (2) of connection, concentrator (2) bag Wireless RF module (9), power line carrier module (10), concentrator (2) is included to carry out by wireless RF module (9) and monitoring terminal (1) Signal connects, and concentrator (2) carries out signal with remote supervisory station (3) by power line carrier module (10) and is connected.

2. a kind of low-voltage electrical safety monitoring assembly based on power line carrier transmission according to claim 1, its feature It is：Described monitoring terminal (1) includes current transformer (4), Leakage Current transformer (5), voltage transformer (11), temperature Sensor (6), Current Voltage collecting unit (7), central processing unit (8), the signal output part of described current transformer (4), The signal output part of Leakage Current transformer (5), the signal output part of voltage transformer (11) gather single with Current Voltage respectively The signal input part connection of first (7), signal output part, the letter of temperature sensor (6) of described Current Voltage collecting unit (7) Number signal receiving end of the output end respectively with central processing unit (8) is connected, the signal output part and concentrator of central processing unit (8) (2) signal receiving end connection.

3. a kind of low-voltage electrical safety monitoring assembly based on power line carrier transmission according to claim 1, its feature It is：Described concentrator (2) includes at least one sub- concentrator, and sub- concentrator is sequentially connected along signal transmission direction.