CN104578429B - Online operation monitoring system for cable branch box - Google Patents

Abstract

The invention proposes an online operation monitoring system for a cable branch box, including a measurement and analysis module, a voltage acquisition module, a current acquisition module, a temperature acquisition module, a communication module, a display module, an acousto-optic alarm module, a corona flashover detection module, a remote Portable terminal, central network server, etc. Real-time measurement of current, voltage, temperature, and even flashover of electrical equipment in the cable branch box, real-time calculation, analysis and judgment, and local or remote early warning and alarm after abnormalities or faults are found. The normal operation data of electrical equipment and related data and information of early warning and alarm can be directly observed on site without opening the box, or can be obtained remotely and instantly through portable terminals and control center network servers. The real-time online automatic monitoring and alarm of the cable branch box is realized, the inspection and inspection are convenient, the safety of the operating personnel is guaranteed, the failure rate of the equipment is effectively reduced, the service life is improved, and the reliability of the power supply is guaranteed. Intensity of work.

Description

Cable branch box online operation monitoring system

technical field

The invention relates to a monitoring technology for a cable branch box, in particular to an online operation monitoring and early warning and alarm system for a cable branch box, belonging to the technical field of smart grid power distribution.

Background technique

In the power system, electrical cabinets such as cable branch boxes, ring network cabinets, and power distribution cabinets are used in a large amount, and they are generally installed in the field or in a long distance, so it is inconvenient to check and patrol; after failures and accidents, operating personnel cannot be informed in time, Moreover, it is necessary to check step by step to determine the electrical cabinet where the fault occurs, which greatly prolongs the troubleshooting time. Therefore, there is an urgent need for a device that can automatically monitor and alarm the electrical cabinet.

During the operation of electrical equipment, it is necessary to know its operation status in time. At present, the cable branch box does not have this function, while other electrical cabinets use ammeters, voltmeters, etc. outside the cabinets. The parameters are limited and real-time data analysis cannot be performed. , Real-time alarm, etc. Especially for the operating temperature of electrical equipment, it is generally not tested.

Affected by the installation environment, the cable branch box is often exposed to the outdoors, especially in the cold areas of the north and the humid areas of the south. The internal temperature and humidity change greatly, which has a great impact on the normal operation of the cable branch box. However, the existing cable branch The box does not have a temperature and humidity adjustment system inside the box.

During the inspection and inspection of the electrical cabinet, the general electrical cabinet is in the live running state. In order to ensure the safety of the operating personnel and improve work efficiency, it is necessary to check the operation of the equipment in the electrical cabinet without opening the cabinet; or through Real-time observation of the operation of electrical equipment in a remote manner. Therefore, there is an urgent need for an online operation monitoring system that can remotely or directly monitor the operation status of the equipment in the electrical cabinet. It can check the internal conditions of any cabinet at any time in the control center or through a portable terminal, and accurately locate and deal with problems in time to ensure power supply. Reliability, improve work efficiency, and ensure the safety of operating personnel.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and solve the problem that the current electrical cabinet lacks effective monitoring means. The invention provides an online operation monitoring system for a cable branch box, which realizes real-time online automatic monitoring and alarming of the electrical equipment in the cable branch box. When the cabinet is running with electricity, it is not necessary to open the cabinet to understand the operation of the electrical equipment, and the inspection is convenient. , to ensure the safety of operating personnel and improve work efficiency; collect various operating parameters of electrical equipment, and conduct real-time data analysis, and give synchronous alarms to faults; automatically adjust the temperature and humidity of the cabinet body, improve the operating environment, increase the service life of equipment, and reduce the failure rate ;The situation inside the cabinet can be checked at the control center or through the portable terminal at any time, and any problem can be accurately located and dealt with in time, which greatly guarantees the reliability of power supply.

The technical scheme that the present invention adopts in order to solve the above problems is:

The system includes a measurement analysis module (1), a voltage acquisition module (2), a current acquisition module (3), a temperature acquisition module (4), a communication module (5), a power supply module (6), a display module (7), Sound and light alarm module (8), control panel (9).

The voltage collection module (2) collects the voltage of the incoming cable (10), the current collection module (3) collects the current of each branch outgoing cable (11) respectively, and the temperature collection module (4) collects the temperature of the cable joint (12), and collects The signal is sent to the measurement analysis module (1) for analysis and processing. The incoming cables (10) of the cable branch box are a group, the three-phase voltage unbalance is very small, and the contact resistance of the general cable joint (12) is also small, so it is only necessary to measure the voltage of the incoming cables (10) ; The outgoing cables (11) may be multiple groups, and the currents are different, so the current of each branch outgoing cable (11) will be measured. The cable joints (12) have contact resistance and will generate heat when current flows, so it is also necessary to measure the temperature of each cable joint (12).

The measurement analysis module (1) sends the measured real-time operation data and the calculated operation data to the display module (7) for real-time display. The measured real-time operation data refers to current, voltage, temperature data, and the calculated operation data is calculated from the measured real-time operation data, such as electric quantity, apparent power, active power, reactive power, power factor, Frequency and harmonics, etc., are all data needed by operators to understand the operation of electrical equipment and lines. After sending the display module (7), operators can check at any time without opening the cabinet.

In order to automatically discover abnormal conditions and faults of electrical equipment, the measurement and analysis module (1) performs calculation, analysis and judgment on the measured real-time operation data and calculated operation data at the same time, and compares with normal historical data or with specified limit values Make comparisons, or carry out fault characteristic pattern recognition and other methods. After discovering abnormal electrical parameters or temperature, an early warning will be given. service life.

The power supply module (6) of the system includes a CT energy-taking coil (601), a rectifier module (602), a voltage stabilizing module (603), and a storage battery (604). The CT energy-taking coil (601) is installed in the inlet of the cable branch box cable (10) side. The cable branch box generally has a voltage of 6KV, 10KV and above, which is very different from ordinary low-voltage electrical cabinets, and cannot directly supply power to the system. It needs a special power module (6), so the CT energy-taking coil (601) is used to take power mode; the storage battery (604) can also ensure the system operation when the cable line is cut off, and when the incoming cable (10) has electricity, the floating charging mode is adopted.

The control panel (9) of the system includes a first button (901) and a data interface (902), the first button (901) is connected to the measurement analysis module (1), and the data interface (902) is connected to the measurement analysis module (1) connected to other external devices. Operators can operate and control the system through the first button (901), such as parameter setting, data viewing, etc.; the data interface (902) can be RS232, USB and other interfaces, and various measured data or historical data can be transmitted to the computer or external devices such as USB flash drives.

In order to further strengthen the function, the system also includes a corona flashover detection module (13), including a partial discharge sensor (1301) and a sampling analysis module (1302); the partial discharge sensor (1301) is installed on each cable of the cable branch box, The detected data is sent to the sampling analysis module (1302), and when the sampling analysis module (1302) analyzes and judges that corona or flashover occurs, the result is sent to the measurement analysis module (1), and the number of times of corona flashover occurring in the cable is recorded and current size, and alarm. The partial discharge sensor (1301) can use a Rogowski coil to monitor the characteristics of the electromagnetic field change caused by the sudden change of the current when the cable corona flashover occurs, so as to realize the non-contact measurement of the cable flashover. The occurrence of corona or flashover can easily lead to insulation deterioration and become a serious hidden trouble, so it is necessary to call the police; the number of times of corona flashover and the magnitude of the current in the cable are used to evaluate the insulation performance and judge the severity of the hidden trouble.

For the situation that the working environment of the cable branch box is relatively harsh, such as a large temperature difference in the north and a humid environment in the south, the system also includes a temperature and humidity control module (16), including an ambient temperature acquisition module (1601), an ambient humidity acquisition module (1602 ), fan (1603), electric heating module (1604); the ambient temperature acquisition module (1601) detects the working environment temperature of the system, if it is higher than the set maximum ambient temperature, start the fan (1603) to dissipate heat; For ambient temperature, start the electric heating module (1604) for heating; the ambient humidity acquisition module (1602) detects the system working environment humidity, if it is higher than the set maximum ambient humidity, start the fan (1603) and the electric heating module (1604) for dehumidification. Therefore, the working environment in the cable branch box, especially the monitoring system, is well improved, the failure rate of the equipment is reduced, and the service life of the equipment and the system is improved.

In addition, if the ambient temperature and humidity do not achieve the set effect after taking the above measures, an alarm will be issued to remind the operating personnel to inspect and deal with it.

In order to improve work efficiency and deal with abnormalities and failures in time, the system also includes a portable terminal (14), including a second button (1401), a liquid crystal display (1402), a terminal communication module (1403), and the portable terminal (14) through The terminal communication module (1403) exchanges data with the measurement analysis module (1). The portable terminal (14) can be used as a supplement or substitute for the display module (7) and the control panel (9), or as an alarm receiving device for operation and maintenance personnel. The portable terminal (14) can be customized, and can also be realized by installing customized corresponding software using a smart phone; and the portable terminal (14) is carried by the operator, and can be used on-site or remotely.

In addition, the system also includes a control center network server (15), and the measurement analysis module (1) exchanges data with the control center network server (15) via the communication module (5). The control center network server (15) can perform remote control, remote inspection, remote alarm, save historical data and the like. And it can exchange data with the portable terminal (14), issue work orders, etc., which greatly improves the intelligence of the system.

In the system, the analysis and judgment finding that the temperature is abnormal means that the measurement and analysis module (1) judges that the temperature measured by the temperature acquisition module (4) exceeds the set temperature alarm threshold, or analyzes the historical change trend of the temperature, and The total current measured by the current acquisition module (3) is used as the load correction factor, and after eliminating the influence caused by the change of the load current, it is judged that the temperature is rising continuously or rising rapidly in a short period of time. This is not limited to the traditional over-limit alarm method, because the normal increase of current will also lead to the increase of temperature, which may affect the accuracy of judgment. Therefore, it is necessary to analyze and judge the trend of temperature change after eliminating the influence of load current change on temperature. ; At this time, if the temperature still continues to rise or rises very quickly in a short period of time, it means that the contact resistance of the cable joint (12) is larger than the normal value, which may cause thermal failure, and the operator is reminded after an early warning Timely maintenance, to avoid the discovery of failures, thus effectively ensuring the reliability of power supply and improving the service life of equipment.

In the described system, the described alarm and early warning are sent to the display module (7) for display by the measurement and analysis module (1) of alarm and early warning related data and information, and at the same time sent to the portable terminal (14) via the communication module (5) Or the control center network server (15) performs remote alarming, and simultaneously drives the sound and light alarm module (8) to perform local alarming. When the operating personnel are on the scene, they can know the abnormality through the sound and light alarm module (8) in time, and check it through the display module (7); You can know the abnormality or fault and its related information in time, and rush to the scene to deal with it.

Compared with the prior art, the present invention has the following advantages:

1) Real-time online monitoring of the operation of the electrical equipment in the cable branch box. You can know the operation of the electrical equipment without opening the cabinet when it is running live. It is convenient for inspection and inspection, ensuring the safety of operating personnel and improving work efficiency.

2) Real-time analysis of electrical equipment operation data, real-time early warning and alarm of electrical parameters and temperature abnormalities and faults, effectively ensuring the reliability of power supply and improving the service life of equipment.

3) Automatically adjust the temperature and humidity of the cabinet, effectively reducing the failure rate of the equipment and improving the service life of the equipment.

4) Using the combination of on-site display module, portable terminal and network server in the control center, no matter whether the operator is on site or not, they can know the abnormality and related information of the electrical equipment in time, which improves the work efficiency and greatly reduces the work intensity of the operator . Moreover, the situation in the cabinet can be checked at the control center or through the portable terminal at any time, and problems can be accurately located and dealt with in a timely manner, which greatly guarantees the reliability and quality of power supply.

5) In the power system, in addition to the cable branch box, electrical cabinets such as ring network cabinets and closed cabinets also have similar characteristics and requirements. The difference is that the electrical equipment inside the electrical cabinet may be different, but the main parameters monitored Basically the same, so this system has wide applicability.

Description of drawings

Figure 1 is a schematic diagram of the internal system of the cable branch box.

Figure 2 is a schematic diagram of the external system of the cable branch box.

In the figure: 1-measurement analysis module, 2-voltage acquisition module, 3-current acquisition module, 4-temperature acquisition module, 5-communication module, 6-power supply module, 7-display module, 8-sound and light alarm module, 9 -Control panel, 901-first button, 902-data interface, 10-incoming cable, 11-outgoing cable, 12-cable connector, 13-corona flashover detection module, 1301-partial discharge sensor, 1302-sampling analysis Module, 14-remote portable terminal, 1401-second button, 1402-liquid crystal display, 1403-terminal communication module, 15-central network server, 16-temperature and humidity control module, 1601-environmental temperature acquisition module, 1602-environmental humidity acquisition Module, 1603-fan, 1604-electric heating module, 17-box cover, 18-box body.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

In order to describe the composition of the system and show the internal situation of the cable branch box, Figure 1 shows the cross-sectional view of the cable branch box, and due to the limited viewing angle, only one phase of the cable is marked; Figure 2 shows the external situation of the cable branch box.

The measurement analysis module (1), voltage acquisition module (2), current acquisition module (3), temperature acquisition module (4), communication module (5), power supply module (6), corona flashover detection module of the system (13), temperature and humidity control module (16) are installed in the cable branch box, as shown in Figure 1.

The display module (7) and control panel (9) of the system are installed outside the cable branch box. Since the box cover (17) is movable, it is fixed on the outer surface of the box body (18) and is dustproof and waterproof. The measures are convenient for operators to observe the operation data at any time, as shown in Figure 2.

The sound and light alarm module (8) of the system is installed outside the cable branch box and fixed on the top of the box body (18), so that the operator can perceive the alarm sound and light from a distance, as shown in Figure 1 , as shown in Figure 2.

Among Fig. 1, the voltage acquisition module (2) collects the voltage of the incoming cable (10), the current acquisition module (3) collects the current of each branch outgoing cable (11) respectively, and the temperature acquisition module (4) collects the cable connector (12) The collected signal is sent to the measurement analysis module (1) for analysis and processing.

In Fig. 1, the power module (6) includes a CT energy harvesting coil (601), a rectifier module (602), a voltage stabilizing module (603), and a storage battery (604), and the CT energy harvesting coil (601) is installed in the inlet of the cable branch box cable (10) side.

Among Fig. 1, corona flashover detection module (13), comprises partial discharge sensor (1301) and sampling analysis module (1302); Partial discharge sensor (1302) is installed on each cable of cable branch box, the data that detects is sent To the sampling analysis module (1302), when the sampling analysis module (1302) analyzes and judges that corona or flashover occurs, the result is sent to the measurement analysis module (1), the number of times and the current size of the cable corona flashover are recorded, and the Call the police.

Among Fig. 1, temperature and humidity control module (16), comprise environment temperature acquisition module (1601), environment humidity acquisition module (1602), fan (1603), electric heating module (1604); Environment temperature acquisition module (1601) detection system work The ambient temperature is sent to the measurement and analysis module (1) for judgment. If it is higher than the set maximum ambient temperature, the measurement and analysis module (1) starts the fan (1603) to dissipate heat. If it is lower than the set minimum ambient temperature, the measurement and analysis module (1) start the electric heating module (1604) to heat; the ambient humidity acquisition module (1602) detects the working environment humidity of the system, and sends it to the measurement and analysis module (1) for judgment. If it is higher than the set maximum ambient humidity, the measurement and analysis module (1) ) start the fan (1603) and the electric heating module (1604) to dehumidify; after the system working environment temperature is adjusted by the fan (1603), if it is still higher than the maximum ambient temperature, or after the electric heating module (1604) is adjusted, if When the ambient temperature is still lower than the minimum ambient temperature, an alarm is issued; after the humidity of the system working environment is adjusted by the fan (1603) and the electric heating module (1604), if it is still higher than the maximum ambient humidity, an alarm is issued.

In Fig. 1, the portable terminal (14) includes a second button (1401), a liquid crystal display (1402), a terminal communication module (1403), and the portable terminal (14) communicates with the measurement analysis module (1) through the terminal communication module (1403) Exchange data.

In Fig. 1, the control center network server (15), the measurement analysis module (1) exchanges data with the control center network server (15) via the communication module (5).

In Fig. 1 and Fig. 2, the measurement and analysis module (1) sends the measured real-time operation data and calculated operation data to the display module (7) for real-time display, and calculates, analyzes and judges at the same time, and gives an early warning after finding abnormal electrical parameters or temperature , when a fault is found, an alarm is issued.

The analysis and judgment find that the temperature is abnormal, for the measurement and analysis module (1) judges that the temperature measured by the temperature acquisition module (4) exceeds the set temperature alarm threshold, or analyzes the historical trend of temperature, and sends the current acquisition module ( 3) The measured total current is used as the load correction factor. After eliminating the influence of the load current change on the temperature, it is judged that the temperature is rising continuously or rising rapidly in a short period of time.

Described early warning or alarm, for measurement and analysis module (1), send early warning or alarm relevant data and information to display module (7) display, send to portable terminal (14) or control center network server ( 15) Perform remote early warning or alarm, and simultaneously drive the sound and light alarm module (8) to perform local early warning or alarm.

In Fig. 2, the control panel (9) includes a first button (901) and a data interface (902), and the first button (901) is connected with the measurement and analysis module (1) for parameter setting and data viewing, and the data interface (902) It is connected with the measurement analysis module (1) and connected with other external devices.

The above descriptions are only preferred implementation examples of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (8)

1. cable branch box on-line operation monitoring system, it is characterised in that：System includes measurement analysis module (1), voltage acquisition Module (2), current acquisition module (3), temperature collect module (4), communication module (5), power module (6), display module (7), Sound and light alarm module (8), control panel (9)；

The voltage of voltage acquisition module (2) collection inlet wire cable (10), current acquisition module (3) gathers respectively each branch's outlet electricity The electric current of cable (11), the temperature of temperature collect module (4) collection cable connector (12), the signal for collecting gives measurement analysis mould Block (1) is analyzed and processed；

The real-time running data for measuring and calculated service data are sent display module (7) in real time by measurement analysis module (1) Show, while calculate analysis judging, after finding electrical quantity or temperature anomaly, carry out early warning, after finding failure, reported to the police；

Power module (6) includes CT taking energy coils (601), rectification module (602), Voltage stabilizing module (603), accumulator (604), CT Taking energy coil (601) is connected with rectification module (602), rectification module (602) and accumulator (604) respectively with Voltage stabilizing module (603) it is connected, Voltage stabilizing module (603) is connected with measurement analysis module (1), and CT taking energy coils (601) are installed in cable branch box Inlet wire cable (10) side；Power module (6) is powered to the system, is entered by the way of CT taking energy coil power takings when cable has electricity Row power supply, is powered when cable is without electricity using accumulator.

2. cable branch box on-line operation monitoring system according to claim 1, it is characterised in that：Control panel (9) is wrapped Include the first button (901) and data-interface (902), button (901) is connected with measurement analysis module (1), data-interface (902) and Measurement analysis module (1) is connected.

3. cable branch box on-line operation monitoring system according to claim 1, it is characterised in that：System is dodged including corona Network detection module (13), including local discharge sensor (1301) and sampling analyses module (1302)；Local discharge sensor (1301) on each cable of cable branch box, sampling analyses module (1302), sampling point are given by the data is activation for detecting When analysis module (1302) analysis judges to occur corona or flashover, send result to measure analysis module (1), record cable occurs The number of times and size of current of corona flashover, and reported to the police.

4. cable branch box on-line operation monitoring system according to claim 1, it is characterised in that：System includes humiture Control module (16), including temperature collection module (1601), collecting ambient humidity module (1602), fan (1603), electricity Thermal modules (1604)；

Temperature collection module (1601) detecting system operating ambient temperature, if higher than the highest ambient temperature of setting, starting Fan (1603) radiates, if less than the minimum ambient temperature of setting, starting electrothermal module (1604) heating；

Collecting ambient humidity module (1602) detecting system working environment humidity, if higher than the highest ambient humidity of setting, starting Fan (1603) and electrothermal module (1604) dehumidify；

System context temperature after the fan (1603) adjustment, if still above highest ambient temperature when, or Jing After crossing the electrothermal module (1604) adjustment, if still be below minimum ambient temperature, reported to the police；System context Humidity through the fan (1603) and electrothermal module (1604) adjustment after, if still above highest ambient humidity when, enter Row is reported to the police.

5. cable branch box on-line operation monitoring system according to claim 1, it is characterised in that：System includes portable Terminal (14), including the second button (1401), liquid crystal display (1402), terminal called module (1403), portable terminal (14) by terminal called module (1403) and measurement analysis module (1) exchange data.

6. cable branch box on-line operation monitoring system according to claim 1, it is characterised in that：System is included in control The heart webserver (15), measurement analysis module (1) Jing communication modules (5) exchanges number with control center server (15) According to.

7. cable branch box on-line operation monitoring system according to claim 1, it is characterised in that：Described analysis judges It was found that temperature anomaly, is that measurement analysis module (1) judges that the temperature level that temperature collect module (4) is measured exceedes the temperature for setting Alarm threshold value, or the historical variations trend of analysis temperature, and the total current that current acquisition module (3) is measured is repaiied as load Positive factor, after eliminating the impact caused to temperature due to load current change, judges temperature within the time of regulation in lasting Rise or rate of climb situation quickly in the short time.

8. cable branch box on-line operation monitoring system according to claim 1, it is characterised in that：Described early warning or report It is alert, it is to measure analysis module (1) by early warning or alarm-related data and direct information display module (7) display, Jing communication modules (5) being sent to portable terminal (14) or control center server (15) carries out distant early warning or warning, while driving acousto-optic Alarm module (8) carries out early warning on the spot or warning.