CN204376537U - Cable branch box on-line operation monitoring system - Google Patents

Abstract

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

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 utility model is to overcome the deficiencies of the prior art, and solve the problem that the current electrical cabinet lacks effective monitoring means. The utility model provides an online operation monitoring system of a cable branch box, which realizes real-time online automatic monitoring and alarm of the electrical equipment in the cable branch box. When the cabinet body is running with electricity, it is not necessary to open the cabinet body to know the operation status of the electrical equipment, and to check and patrol Convenient, ensuring the safety of operating personnel and improving work efficiency; collecting various operating parameters of electrical equipment, and performing real-time data analysis, and synchronously alarming faults; automatically adjusting the temperature and humidity of the cabinet body, improving the operating environment, increasing the service life of equipment, and reducing faults The situation in the cabinet can be checked at the control center or through the portable terminal at any time. If any problem occurs, it can be accurately located and dealt with in time, which greatly guarantees the reliability of power supply.

The technical scheme that the utility model 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), and the temperature collection module (4) collects the temperature of the cable joint (12). 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 degree 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 in multiple groups, and the currents are different, so the current of each branch outgoing cable (11) must be measured. The cable joints (12) have contact resistance and will generate heat when current flows, so the temperature of each cable joint (12) also needs to be measured.

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 to 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) calculates, analyzes and judges the measured real-time operation data and the calculated operation data at the same time, and compares it with normal historical data or with the specified limit value 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 harvesting coil (601), a rectifier module (602), a voltage stabilization module (603), and a battery (604). The CT energy harvesting coil (601) is installed in the inlet of the cable branch box wire 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 method; the storage battery (604) can also ensure the operation of the system when the cable line is powered off, and when the incoming cable (10) has power, the floating charging method is adopted.

The control panel (9) of the system includes a button (901) and a data interface (902), the button (901) is connected to the measurement and analysis module (1), the data interface (902) is connected to the measurement and analysis module (1), and other external device. Operators can operate and control the system through the buttons (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 U disk or other external devices.

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 unit (1302); the partial discharge sensor (1302) is installed on each cable of the cable branch box, Send the detected data to the sampling and analysis module (1302), and when the sampling and analysis module (1302) analyzes and judges that corona or flashover occurs, it sends the result to the measurement and analysis module (1), and records the number of times that the cable corona flashover occurs 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 has a corona flashover, 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.

In view of the harsh working environment of the cable branch box, such as large temperature difference in the north and 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) for heat dissipation, if it is lower than the set minimum For the ambient temperature, start the electric heating module (1604) for heating; the ambient humidity acquisition module (1602) detects the working environment humidity of the system, and 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 still cannot reach the set ambient temperature and humidity control effect after taking the measures of adjusting and controlling the fan (1603) and the electric heating module (1604), an alarm will be issued to remind the operating personnel Inspection and processing.

In order to improve work efficiency and deal with abnormalities and faults in a timely manner, the system also includes a portable terminal (14), including buttons (1401), liquid crystal display (1402), and a terminal communication module (1403). The portable terminal (14) communicates through the terminal The 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 with 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 so on. And it can exchange data with the portable terminal (14), issue work instructions, 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 After the total current measured by the current acquisition module (3) is used as the load correction factor to eliminate the influence of the load current change, 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; this , if the temperature continues to rise or rises rapidly 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. , It is discovered after avoiding the fault, thus effectively ensuring the reliability of power supply and improving the service life of the equipment.

In the system, the alarm and early warning are the data and information related to the alarm and early warning sent by the measurement analysis module (1) to the display module (7) for display, 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 operator is on site, he 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 utility model has the following advantages:

1) Real-time online monitoring of the operation of the electrical equipment in the cable branch box. It is not necessary to open the cabinet to understand the operation of the electrical equipment during live operation. 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 abnormalities and related information of electrical equipment in time, which improves work efficiency and greatly reduces the work intensity of operators . 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.

Fig. 2 is a schematic diagram of the external system of the cable branch box; Fig. 3 is a schematic diagram of a portable terminal; Fig. 4 is a schematic diagram of a control center network server.

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-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-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 ways

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

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.

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) and the 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 (18), so that the operator can detect the alarm sound and light from a distance, as shown in Figure 1 , as shown in Figure 2.

In Figure 1, 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), and the temperature collection 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 stabilization module (603), and a battery (604). The CT energy harvesting coil (601) is installed in the inlet of the cable branch box wire cable (10) side.

In Fig. 1, the corona flashover detection module (13) includes a partial discharge sensor (1301) and a sampling analysis unit (1302); the partial discharge sensor (1302) is installed on each cable of the cable branch box, and the detected data is sent to To the sampling and analysis module (1302), when the sampling and analysis module (1302) analyzes and judges the occurrence of corona or flashover, the result is sent to the measurement and analysis module (1), records the number of times and current of the cable corona flashover, and conducts Call the police.

In Fig. 1, the temperature and humidity control module (16) includes an ambient temperature acquisition module (1601), an ambient humidity acquisition module (1602), a fan (1603), and an electric heating module (1604); the ambient temperature acquisition module (1601) detects the work of the system 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 ) to start the fan (1603) and the electric heating module (1604) to dehumidify; after taking the measures of regulating and controlling the use of the fan (1603) and the electric heating module (1604), if the temperature and humidity of the working environment of the system still cannot reach the set If the ambient temperature and humidity control effect, the alarm will be given.

Figure 3 is a portable terminal (14), including buttons (1401), liquid crystal display (1402), terminal communication module (1403), the portable terminal (14) communicates with the measurement and analysis module (1) in Figure 1 through the terminal communication module (1403) ) to exchange data.

Fig. 4 shows the control center network server (15). The measurement analysis module (1) in Fig. 1 exchanges data with the control center network server (15) via the communication module (5).

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

The above analysis and judgment find that the temperature is abnormal, so that the measurement 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 changes, and sends the current acquisition module ( 3) After the measured total current is used as a load correction factor to eliminate the influence of load current changes, it is judged that the temperature is rising continuously or rising rapidly in a short period of time within the specified time.

The early warning or alarm is that the measurement and analysis module (1) sends the data and information related to the early warning or alarm to the display module (7) for display, and sends it to the portable terminal (14) or the control center network server ( 15) Carry out 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 button (901) and a data interface (902), and the button (901) is connected to the measurement analysis module (1) for parameter setting and data viewing, and the data interface (902) is connected to the measurement analysis module (1) Connected to other external devices.

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

Claims (8)

1. Cable branch box online operation monitoring system, characterized in that: the system includes measurement analysis module (1), voltage acquisition module (2), current acquisition module (3), temperature acquisition module (4), communication module (5), Power supply module (6), 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), and the temperature collection module (4) collects the temperature of the cable joint (12). The received signal is sent to the measurement analysis module (1) for analysis and processing; The measurement and analysis module (1) sends the measured real-time operation data and the calculated operation data to the display module (7) for real-time display, and calculates, analyzes and judges at the same time. When abnormal electrical parameters or temperature are found, an early warning is issued, and when a fault is found, an alarm is issued. . 2. The online operation monitoring system of the cable branch box according to claim 1, characterized in that: the power module (6) includes a CT energy-taking coil (601), a rectifier module (602), a voltage stabilizing module (603), a battery ( 604), the CT energy-taking coil (601) is installed on the incoming cable (10) side of the cable branch box. 3. The online operation monitoring system of the cable branch box according to claim 1, characterized in that: the control panel (9) includes buttons (901) and data interfaces (902), and the buttons (901) are connected to the measurement and analysis module (1) , the data interface (902) is connected with the measurement analysis module (1). 4. The online operation monitoring system of the cable branch box according to claim 1, characterized in that: the system includes a corona flashover detection module (13), including a partial discharge sensor (1301) and a sampling analysis unit (1302); partial discharge The sensor (1302) is installed on each cable of the cable branch box, and the detected data is sent to the sampling and analysis module (1302), and the sampling and analysis module (1302) analyzes and judges that corona or flashover occurs, and sends the result to the measurement and analysis module (1) Record the number of corona flashovers and the magnitude of the current on the cable, and give an alarm. 5. The online operation monitoring system of the cable branch box according to claim 1, characterized in that the system includes a temperature and humidity control module (16), including an ambient temperature acquisition module (1601), an ambient humidity acquisition module (1602), a fan ( 1603), electric heating module (1604); The ambient temperature acquisition module (1601) detects the working ambient temperature of the system. If it is higher than the set maximum ambient temperature, start the fan (1603) to dissipate heat. If it is lower than the set minimum ambient temperature, start the electric heating module (1604) to heat; The ambient humidity acquisition module (1602) detects the humidity of the working environment of the system, and if it is higher than the set maximum ambient humidity, starts the fan (1603) and the electric heating module (1604) to dehumidify; After the temperature and humidity of the working environment of the system are adjusted and controlled by the fan (1603) and the electric heating module (1604), if the set ambient temperature and humidity control effect is still not achieved, an alarm will be issued. 6. The online operation monitoring system of cable branch box according to claim 1, characterized in that: the system includes a portable terminal (14), including buttons (1401), liquid crystal display (1402), terminal communication module (1403), portable terminal (14) Exchange data with the measurement analysis module (1) through the terminal communication module (1403). 7. The online operation monitoring system of the cable branch box according to claim 1, characterized in that the system includes a control center network server (15), the measurement analysis module (1) communicates with the control center network server (15) via the communication module (5) ) to exchange data. 8. The online operation monitoring system of the cable branch box according to claim 1, characterized in that: the early warning or alarm is for the measurement and analysis module (1) to send the data and information related to the early warning or alarm to the display module (7) The display is sent to the portable terminal (14) or the control center network server (15) via the communication module (5) for remote early warning or alarm, and at the same time, the sound and light alarm module (8) is driven for local early warning or alarm.