CN202631616U - Over-limit current monitoring system for underground high-voltage cable protective layer - Google Patents

Abstract

The utility model discloses an underground high-voltage cable sheath over-limit current monitoring system, which includes a monitoring platform, a monitoring host and a current collector from top to bottom, the monitoring platform includes a front-end control server, and the front-end control server is at least It is connected with a monitoring host, and the monitoring host is connected with at least one current collector. The beneficial effects of the utility model: the system is highly pertinent, has good reliability, and has perfect system functions. The computer monitoring platform is used to realize the transient and sudden change monitoring of the over-limit current of the sheath during the operation of the cable, and realize the analysis of the cause of the fault and the location of the fault section. Provide technical conditions for line repair and early warning.

Description

Underground high-voltage cable sheath over-limit current monitoring system

technical field

The utility model relates to an over-limit current monitoring system, in particular to an over-limit current monitoring system for an underground high-voltage cable sheath. the

Background technique

With the continuous economic growth and the rapid development of urban power grids, in order to meet the requirements of modern cities for power supply reliability and environmental beautification, the commissioning lines using power cables as power supply methods have grown rapidly. Moreover, the high-voltage cable lines are responsible for important power transmission tasks in the urban network. the

For the underground laying of power cables, except for the standard power tunnels for the main lines (220kV and above), most of the power cables with voltage standards of 110kV and below are laid in pipes and trenches. Performing maintenance is required work. Among them, the online monitoring of the insulation grounding current of the underground high-voltage cable line sheath is an important part of maintaining the good operation of the power grid. the

On-line monitoring of insulation grounding current of underground high-voltage cable line sheath, including two status monitoring of running static state and over-limit fault. Running static means that the sheath induction current within a certain limit is allowed to exist when the high-voltage cable is in normal operation. This current is generally affected by factors such as grounding mode, good grounding, core load, and insulation aging. Within the safety range, it belongs to the normal operation monitoring range, and the sheath grounding current monitoring system for this normal operation condition has been realized. the

In addition to the above normal operating state, due to the aging of cable joints, damage to the insulation layer, short-circuit breakdown, lightning dissipation and circulation heating, etc., the current of the cable sheath will increase instantaneously, resulting in tripping and power failure, and may even cause Fire; for this sudden change of sheath current, the existing normal current monitoring cannot achieve accurate and effective collection, because the static current monitoring alone cannot capture the transient current when the fault occurs, and it is also impossible to realize Timely response to transient over-limit current during faults. the

Utility model content

The technical problem to be solved by the utility model is to monitor the transient and sudden change of the over-limit current of the sheath when the cable is running, by capturing the sudden change signal of the sheath current, analyzing the cause of the fault, locating the fault section, and providing emergency repair and early warning for the line. Technical conditions, for this reason, the utility model provides an underground high-voltage cable sheath over-limit current monitoring system, which has the advantages of strong pertinence, good reliability, and perfect system functions. the

In order to achieve the above object, the utility model adopts the following technical solutions:

An underground high-voltage cable sheath over-limit current monitoring system, which includes a monitoring platform, a monitoring host and a current collector from top to bottom,

The monitoring platform includes a front-end control server, the front-end control server is connected to at least one monitoring host, and the monitoring host is connected to at least one current collector. the

The monitoring platform also includes an application server, and the application server is respectively connected with the resource management server, the front-end control server, the monitoring seat, the voice processing server, the short message processing server and the data analysis server. the

The monitoring host includes a power conversion and communication pulse generation board, a data acquisition and communication board, a serial communication board, a base board, the power conversion and communication pulse generation board, a data acquisition and communication board, and a serial communication board Connect to the base plate. the

The monitoring host is 6U rack-mounted modular, and the data acquisition and communication boards are redundantly backed up, supporting up to 8 data acquisition and communication boards, and each board has 8 communication ports, with a maximum 64 communication ports. the

A maximum of 16 current collectors can be mounted on each communication port. the

The communication distance between the monitoring host and the current collector is 0KM-10KM. the

The current collector is connected to at least one current transformer provided on the cable, and the transient range of the measured over-limit current of the sheath insulation is 500A to 2000A; the locking time of the over-limit current is 1.2ms to 20ms; The resolution time is 10ms; the minimum time for over-limit current capture is 4ms-1s; the current saturation lower limit of the current transformer is not less than 2000A, and the rated secondary load is 4Ω. the

The monitoring platform is a Real-time real-time monitoring platform. The Real-time real-time monitoring platform supports the access of a variety of commonly used devices, can quickly control and respond to the data of the monitored devices, and has an open architecture, which facilitates the expansion of functions and the access of third-party platforms. The platform can increase or decrease modules according to the needs of users to meet the needs of users at different levels. the

The working principle of the utility model

Use the current transformer set on the cable to collect the transient and sudden changes of the over-limit current of the sheath, and upload the collected data to the monitoring platform through the current collector connected with the current transformer. The server analyzes and compares the transient and sudden changes of the collected over-limit current data in real time. If an over-limit current occurs, the system will start and complete the analysis of the cause of the fault, locate the fault section, and provide data basis for line repair and early warning. Work. the

Beneficial effects of the utility model

The system has strong pertinence, good reliability, and perfect system functions. The computer monitoring platform is used to realize the transient and sudden change monitoring of the over-limit current of the sheath during cable operation, to realize the analysis of the cause of the fault, to locate the fault section, and to provide emergency repair and early warning for the line. The purpose of the corresponding technical conditions. the

Description of drawings

Figure 1: Schematic diagram of the over-limit current monitoring system for underground high-voltage cables;

Figure 2: Schematic diagram of Real-time real-time monitoring platform;

Figure 3: Schematic diagram of the composition and structure of the monitoring host;

Figure 4: Schematic diagram of the structure of the current collector. the

Among them, 1. Monitoring platform, 2. Monitoring host, 3. Current collector, 4. Application server, 5. Resource management server, 6. Front-end control server, 7. Monitoring seat, 8. Voice processing server, 9. SMS processing Server, 10. Data analysis server, 11. Backplane, 12. Power conversion and communication pulse generating board, 13. Data acquisition and communication board, 14. Serial communication board, 15. Current transformer. the

Detailed ways

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

Figure 1, the underground high-voltage cable sheath over-limit current monitoring system, which includes a monitoring platform 1, the monitoring platform 1 is a Real-time monitoring platform, and also includes a monitoring host 2 and a current collector 3 that are sequentially connected to the Real-time real-time monitoring platform . the

Figure 2, Real-time real-time monitoring platform, it includes application server 4, application server 4 is connected with resource management server 5, front-end control server 6, monitoring agent 7, voice processing server 8, short message processing server 9 and data analysis server 10 respectively ; The front-end control server 6 is connected to at least one monitoring host 2, and the monitoring host 2 is connected to a current collector 3. the

The application server 4 provides network connection, communication and database operation for all devices. The resource management server 5 is a data configuration management module that configures other devices to connect and communicate with the application server 4. Other devices can only become effective working devices after the resource management server 5 has configured corresponding data. The front-end control server 6 transmits the data to the application server 4, and at the same time forwards the received control instructions sent by the application server 4 and the monitoring agent 7 to the monitoring host 2, so that the monitoring host 2 works passively. The monitoring seat 7 is a device directly facing the user. It provides the user with a man-machine interface, real-time monitoring of the operation of the equipment, alarm processing, geographic positioning, telemetry and remote control, and maintenance personnel management. Voice processing server 8 is a voice processing module, which provides telephone voice alarm service for the system. The short message processing server 9 is a short message processing module, which provides the sending and receiving service of mobile phone short messages for the system. The data analysis server 10 is the system's basic data and historical data statistics and query device, and generates excel reports from the data according to user needs. the

The core module of the Real-time real-time monitoring platform is the application server 4, which can accept the registration application of multiple modules, and then provide these modules with various functions such as collecting data, reporting data, data analysis, and data integration. According to the different equipment in the monitoring system, according to the different types of received data, the system can receive various data formats such as data, voice, SMS, video, etc., and realize the functions of monitoring equipment control and calibration. The voice control module provides the functions of active alarm in the voice form of the telephone, telephone authentication, and telephone control and monitoring equipment. The short message module provides the active alarm in the form of short message and the function of short message control monitoring equipment. The alarm center module is linked with the voice and SMS modules to provide the source of alarm information. The linkage control module analyzes the status changes of the monitoring equipment according to the linkage information configured by the user. After reaching the set conditions, the linkage control multiple equipment realizes the automatic processing of the system's alarm status, which greatly saves the staff's time. workload. These modules are centrally managed and configured through the resource management module. the

3 , the monitoring host 2 includes a power conversion and communication pulse generating board 12 , a data acquisition and communication board 13 , a serial communication board 14 , and a bottom board 11 . The power conversion and communication pulse generating board 12 , the data acquisition and communication board 13 , and the serial port communication board 14 are connected to the bottom board 11 . the

Power conversion and communication pulse generation board 12 completes power conversion and communication pulse signal generation; data acquisition and communication board 13 completes data transmission and communication with serial communication board 14; serial communication board 14 completes data acquisition and communication board 13 Communication with the monitoring platform 1, data acquisition and communication board 13 and the serial port communication board 14 are serial port communication, and the serial port communication board 14 is converted into a network port and connected to the monitoring platform 1; the serial communication board 14 is a standard Multi-serial port server, and convert the serial port into a network port to connect with the monitoring platform 1; the backplane 11 completes the data interaction and power supply between the power conversion and communication pulse generation board 12, the serial communication board 14, and the data acquisition and communication board 13 powered by. the

The monitoring host adopts a 6U rack-mounted modular design, and the adjacent data acquisition and communication boards 13 adopt redundant backup to realize intelligent switching and ensure reliability; the monitoring host 2 supports a maximum of 138 data acquisition and communication boards. , each board has 8 communication ports, and each communication port can mount 1 to 16 current collectors 3, so that the host has a maximum of 64 ports. The communication distance between the monitoring host 2 and the current collector is 0KM-10KM. the

As shown in Fig. 4, the current collector 3 is connected to the current transformer 15, and the online monitoring function of the transient 500A-2000A over-limit current of the sheath insulation is realized through the current collector 3 and the current transformer 15. The monitoring objects include the overrunning current direction, overrunning duration, A, B, C, T four-phase overrunning sequence. the

The locking time of over-limit current is 1.2ms～20ms; the resolution time of over-limit sequence is 10ms; the minimum duration of over-limit current capture is 4ms～1s;

Current transformer 15, the lower limit of current saturation is not less than 2000A, and the rated secondary load is 4Ω. the

Monitoring object analysis:

Overlimit current direction: When the current of one phase of the sheath exceeds the limit, it will cause the magnitude and direction of the ground current of the other two phase sheaths to change, so the flow direction of the three-phase current must be judged. the

Over-limit current duration: used to consider the size of the over-limit current. the

Four-phase over-limit sequence: sort the four-phase over-limit current generation time to judge which phase exceeds the limit first, and provide reference conditions for comprehensive judgment. the

Through the monitoring of the over-limit current of the underground high-voltage cable sheath, it can replace the traditional manual regular ground current inspection. the

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model. the

Claims (6)

1. underground high voltage cable sheath current monitoring system that transfinites; It comprises monitor supervision platform (1) from top to bottom respectively; Monitoring host computer (3) and current acquisition device (3) is characterized in that, comprise front-end control server (6) in the said monitor supervision platform (1); Said front-end control server (6) is connected with a monitoring host computer (2) at least, and monitoring host computer (2) is connected with a current acquisition device (3) at least.

2. the underground high voltage cable sheath as claimed in claim 1 current monitoring system that transfinites is characterized in that, said monitoring host computer (2) comprises that power source conversion and communication pulse produce plate (12); Data acquisition and communication plate (13); Serial communication plate (14), base plate (11), said power source conversion and communication pulse produce plate (12); Data acquisition and communication plate (13), serial communication plate (14) is connected with base plate (11).

3. the underground high voltage cable sheath as claimed in claim 1 current monitoring system that transfinites; It is characterized in that; Said monitoring host computer (2) is a 6U rack modularization, and said data acquisition and communication plate (13) adopt redundancy backup, supports (13) 8 of grafting data acquisition and communication plates at most; Every block of plate possesses 8 COM1s, and maximum possesses 64 COM1s.

4. the underground high voltage cable sheath as claimed in claim 1 current monitoring system that transfinites is characterized in that, maximum 16 the current acquisition devices of carry (3) of said each COM1.

5. the underground high voltage cable sheath as claimed in claim 1 current monitoring system that transfinites is characterized in that the communication distance between said monitoring host computer (2) and the current acquisition device is 0KM～10KM.

6. the underground high voltage cable sheath as claimed in claim 1 current monitoring system that transfinites; It is characterized in that; At least one current transformer (15) that is provided with on said current acquisition device (3) and the cable is connected, and the insulating sheath of the surveying current transient value range that transfinites is 500A～2000A; Transfinite locking time of electric current is 1.2ms～20ms; Transfinite resolving time of order is 10ms; It is 4ms～1s that the electric current that transfinites is caught minimum duration; Said current transformer (15), the current saturation lower limit is not less than 2000A, specified secondary load 4 Ω.

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