CN116930684A - System and method for monitoring state of seabed high-voltage cable of offshore wind farm - Google Patents
System and method for monitoring state of seabed high-voltage cable of offshore wind farm Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The application relates to a system and a method for monitoring the state of a submarine high-voltage cable of an offshore wind farm, comprising the following steps: the cable partial discharge monitoring system and the cable grounding current monitoring system; the cable partial discharge monitoring system monitors partial discharge of the cable terminal joint on line, simultaneously analyzes and pre-warns partial discharge monitoring data in real time, and remotely transmits analysis results of the partial discharge data to a remote master station through a station end unit; the cable grounding current monitoring system monitors the grounding current of the cable terminal connector. The beneficial effects of the application are as follows: the application can monitor the partial discharge and the grounding current of the submarine cable at the same time, and realize the comprehensive monitoring and evaluation of the submarine cable state. The design has simple implementation conditions, lower technical requirements for operators and better meets the actual requirements of engineering. The method has a certain guiding significance on the design of the submarine cable state monitoring system.
Description
Technical Field
The application relates to the technical field of offshore wind power, in particular to a system and a method for monitoring the state of a submarine high-voltage cable of an offshore wind farm.
Background
Along with popularization of offshore wind power technology, the application of the submarine high-voltage cable is also becoming wider and wider. The current online state monitoring research on land cables is mature, and the literature on the state monitoring research is more at home and abroad, but the research on various state monitoring matched with submarine high-voltage cables is less.
Disclosure of Invention
The application aims at overcoming the defects of the prior art and provides a system and a method for monitoring the state of a submarine high-voltage cable of an offshore wind farm.
In a first aspect, a submarine high-voltage cable state monitoring system of an offshore wind farm is provided, which comprises a cable partial discharge monitoring system and a cable grounding current monitoring system; the cable partial discharge monitoring system monitors partial discharge of the cable terminal connector on line, simultaneously analyzes and pre-warns partial discharge monitoring data in real time, and remotely transmits analysis results of the partial discharge data to a remote master station through a station end unit; the cable grounding current monitoring system monitors the grounding current of the cable terminal connector.
Preferably, the monitoring parameters of the cable partial discharge monitoring system include: the magnitude of the pulse amplitude and the value of the ground current on the ground line at the junction.
Preferably, the cable partial discharge monitoring system comprises a partial discharge sensor, a front end acquisition module and a main station; the local discharge sensor is in communication connection with the master station through the front end acquisition module; the front-end acquisition module comprises a data acquisition unit, a signal conditioning unit, an optical fiber transmission unit and a power supply unit.
Preferably, the cable grounding current monitoring system includes: the system comprises a field transmitter, a remote monitoring terminal and a control center server, wherein the operation state of a cable is monitored by monitoring the operation current of the cable and the current of a protective layer, monitoring data are sent to the control center server in an optical cable mode by adopting a field bus, and meanwhile, the control center server performs corresponding data analysis, management and fault judgment according to the field condition.
Preferably, the cable grounding current monitoring system is integrated with a high-frequency pulse fault wave recording device.
Preferably, the method further comprises: a cable thermometry system, the cable thermometry system comprising: the cable temperature measurement optical fiber, the cable distributed temperature measurement host computer and the control center.
In a second aspect, a method for monitoring a state of a submarine high-voltage cable of an offshore wind farm is provided, which is executed by the submarine high-voltage cable state monitoring system of the offshore wind farm in any one of the first aspects, and includes:
s1, carrying out on-line monitoring on the partial discharge level of a cable joint by utilizing a cable partial discharge monitoring system, analyzing and early warning partial discharge monitoring data in real time, and simultaneously transmitting the analysis result of the partial discharge data to a remote master station through a station end unit; positioning the cable line with the confirmed partial discharge source;
s2, monitoring the running current and the sheath current of the cable by using a cable grounding current monitoring system, determining the running state of the cable, transmitting monitoring data to a control center server in an optical cable mode by adopting a field bus, and simultaneously carrying out corresponding data analysis, management and fault judgment according to the field condition and alarming when the cable runs and fails.
Preferably, S1 includes:
obtaining a partial discharge signal through a partial discharge sensor;
the front end acquisition module is used for gating, amplifying, detecting and acquiring the local discharge signals, converting the final result into digital signals after calculating the final result, and transmitting the data to the data server through the optical fiber local area network communication protocol.
Preferably, in S1, positioning the cable line for which the partial discharge source is confirmed further includes:
the distance from the local discharge source to the left submarine cable joint is x1, the distance from the right submarine cable joint is x2, and the total length of the submarine cable body is L;
the partial discharge signals of the connectors on the left side and the right side are monitored through the grounding wire, the partial discharge pulse signals of the grounding wire on the left side are monitored after t1 time, and the partial discharge pulse signals of the grounding wire on the right side are monitored after t2 time; positioning the partial discharge source of the submarine cable body according to t1 and t2, and representing:
x1＝t1*L/(t1+t2),x2＝t2*L/(t1+t2)。
preferably, the method further comprises: and S3, monitoring the joint temperature and giving an alarm when the joint temperature is abnormal.
The beneficial effects of the application are as follows:
1. the design provided by the application can monitor the partial discharge and the grounding current of the submarine cable at the same time, and realize the comprehensive monitoring and evaluation of the submarine cable state. The design has simple implementation conditions, lower technical requirements for operators and better meets the actual requirements of engineering. The method has a certain guiding significance on the design of the submarine cable state monitoring system.
2. Compared with the existing capacitive coupling method and inductive coupling method based on submarine cable bodies, the local discharge source positioning technology provided by the application has the advantages of simple implementation mechanism, low cost, strong operability, high reliability and the like.
Drawings
FIG. 1 is a hierarchical diagram of a submarine high-voltage cable state monitoring system of an offshore wind farm provided by the application;
FIG. 2 (a) is a schematic diagram of partial discharge levels corresponding to dendritic electrical tree defects;
FIG. 2 (b) is a schematic diagram of partial discharge levels corresponding to the cluster-like electrical tree defects;
FIG. 3 is a schematic diagram of a partial discharge positioning technique based on submarine cable ground wires;
FIG. 4 is a block diagram of a submarine cable termination system;
fig. 5 is a diagram of a cable termination ground current positioning on-line monitoring distributed network configuration.
Detailed Description
The application is further described below with reference to examples. The following examples are presented only to aid in the understanding of the application. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present application without departing from the principles of the application, and such modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Example 1:
the embodiment of the application provides a submarine high-voltage cable state monitoring system of an offshore wind farm, which comprises a cable partial discharge monitoring system and a cable grounding current monitoring system; the cable partial discharge monitoring system monitors partial discharge of the cable terminal connector on line, simultaneously analyzes and pre-warns partial discharge monitoring data in real time, and remotely transmits analysis results of the partial discharge data to a remote master station through a station end unit; the cable grounding current monitoring system monitors the grounding current of the cable terminal connector.
As shown in fig. 1, the embodiment of the application divides the cable running state on-line monitoring system into a three-layer structure, wherein the physical layer is a sensor device of each type, and all the sensor devices of the layer are not electrically connected with the primary device, so that the normal running of the primary device is not affected; the monitoring layer is a main part of the equipment, the data is collected and analyzed in a centralized way, and the monitoring layer and the background system form an optical fiber local area network structure; the station control layer is a device layer facing a user, and has the functions of final data storage, analysis, display and the like.
The cable manufactured in the factory must be subjected to a high voltage withstand test before shipment to check whether partial discharge exists. After the cable is constructed and installed on site, the cable is subjected to site withstand voltage and partial discharge test so as to ensure safe operation. Relevant partial discharge test standards are formulated by IEC organizations and countries around the world, weak links in an insulation system are timely found through monitoring of partial discharge, fault reasons are found, the quality of submarine cables is guaranteed, and safe and reliable operation of a power system is guaranteed.
Through comparative analysis of a plurality of field test data, the partial discharge level at the cable joint is closely related to the monitored pulse amplitude, and the relationship between the electrical tree and the discharge amount in solid insulation is utilized, as shown in fig. 2, the degradation condition inside the cable can be comprehensively evaluated, and the early warning of the insulation breakdown accident can be performed to the greatest extent; on the basis, the original partial discharge measuring system is designed in a simplified manner, the real-time monitoring is carried out only by taking the pulse amplitude value and the grounding current value on the grounding line at the joint as main monitoring parameters, the on-line monitoring of the partial discharge level of the cable joint is realized, and the cable line with the confirmed partial discharge source is accurately positioned by utilizing a unique positioning technology of the partial discharge source in cooperation with a portable partial discharge monitoring instrument. It should be noted that the submarine cable connector is grounded, zero voltage, and only passes through a very small leakage current, and the leakage current is provided with pulse current information generated by partial discharge. Only measuring the partial discharge parameter on the submarine cable grounding line is an innovation point of the application, so that the on-line monitoring can be realized in the submarine cable operation process, and the monitoring of the submarine cable body with high voltage or the off-line monitoring after the submarine cable is stopped can be avoided.
The cable partial discharge monitoring system adopted in the implementation has the following indexes and functions:
basic partial discharge parameters such as discharge capacity, discharge phase, discharge times and the like can be detected, and statistics of related parameters can be provided according to requirements; sampling rate of system partial discharge pulse signals: 100MS/s; the using frequency band of the HFCT sensor is more than 10 KHz-50 MHz; minimum measured discharge amount: 5pC; measuring frequency band of 100kHz-30MHz; maximum measurable discharge 1nC, discharge pulse resolution: 10 μs; phase resolution: 0.18 °; the system can display a power frequency periodic discharge map, two-dimensional (Q-phi, N-Q) and three-dimensional (N-Q-phi) discharge spectrograms, wherein an expert recognition library, the type of discharge recognized by a neural network, corona discharge, surface discharge, internal discharge and the like are arranged in the system; the device has an online positioning function, can be matched with portable equipment to perform partial discharge source positioning, and has positioning precision of +/-1 m; the method can record relevant parameters such as measurement phase sequence, discharge amount, discharge phase, measurement time and the like, can provide a discharge trend chart, has early warning and alarming functions, and can inquire, delete, backup, print reports and the like on a database; the method is suitable for insulation monitoring of submarine cables with voltage levels of 66kV and above, and can be effectively integrated into a comprehensive evaluation system; the system collects and processes signals as follows: signal acquisition and transmission, signal feature extraction, pattern recognition, fault diagnosis and cable equipment state evaluation; the system can provide phase information, amplitude information and occurrence density information of the partial discharge signals, and is helpful for judging the type and severity of discharge.
The cable partial discharge monitoring system has the following characteristics:
the partial discharge detection requirement of the terminal GIS equipment in the electrified working state can be met;
the partial discharge has strong anti-interference capability, the system adopts a broadband detection technology, has a complete interface protection circuit, effectively resists heavy current impact, and has low power consumption; the system has a wave recording function, original test data are stored, the original data in a test state can be played back, and the phase judgment of a discharge source can be carried out under the cross interconnection of three-phase cables, so that the original data can be clearly analyzed after the three-phase cables are offline; according to the field conditions, the optical fiber local area network transmission network can be adopted, and the transmission distance is long, stable and reliable. The structure is compact, the installation is convenient, and the wireless transmission mode structure can be adopted; the cable body can be used for taking electricity, and any cable is not required to be paved on site, so that the safety is high; the virtual instrument technology is adopted, a hardware module is combined with a computer, labVIEW is utilized to write software, various functions are realized through interface operation, and further development is facilitated.
Specifically, the cable partial discharge monitoring system comprises a partial discharge sensor, a front end acquisition module and a main station; the local discharge sensor is in communication connection with the master station through the front end acquisition module; the front-end acquisition module comprises a data acquisition unit, a signal conditioning unit, an optical fiber transmission unit and a power supply unit.
As shown in fig. 4, the cable terminal on-line monitoring system adopts a distributed structure, that is, the cable joint partial discharge signals are subjected to gating, amplifying, detecting and collecting through the front units distributed at each monitoring point, after the final result is calculated, the final result is converted into digital signals, the digital signals are transmitted to a data server through an optical fiber local area network communication protocol, and the data server uniformly displays and analyzes the signals. Each group (divided into three phases of A, B and C) of cable joints is provided with a front acquisition module, and each sensor module is distributed and installed near the tested cable joint equipment. Each front acquisition module is responsible for analyzing and calculating the partial discharge of a group of cable joints (A, B and C three phases), and the cable joints are realized through the optical fiber local area network transmission module and are communicated with the data server in a digital communication mode. All monitoring data are stored in a data storage query module of the database of the master station computer.
The sensor can be a partial discharge high-frequency sensor (SCHF-I), and the SCHF-I sensor consists of a magnetic core, a Rogowski coil, a filtering and sampling unit and an electromagnetic shielding box. Based on the original common HFCT, a sensor with better sensitivity is newly developed, and the requirements of measuring sensitivity and signal response frequency band are considered. In order to suppress interference, improve the signal to noise ratio, and consider requirements such as rain-proof, dustproof, rogowski coil and filtering sampling unit are all installed in the metal shielding box.
The performance indexes of the sensor are as follows:
1) Model: SCHF-i;
2) Specification of: inner diameter 40 mm/outer diameter 122mm, thickness 40mm: TNC interface;
3) Frequency band: 500 kHz-50 MHz;
4) Sensitivity: 25mV/mA (when the input signal is 10MHz positive brown wave current, the standard is not less than 5 mV/mA)
5) And (3) standard preparation: three (one for each phase of each set of joints A, B, C).
The cable partial discharge monitoring system is provided with a detection device, the functions of which comprise channel selection, data acquisition, data storage and processing, can drive a transmission part of the optical fiber local area network to carry out data transmission, and is also responsible for monitoring partial discharge signals of a group of connectors (namely AB and C three phases), and the equipment can be arranged in a terminal cabinet near a measuring point or a self-standing outdoor terminal box. The shell of the detection device is made of cast aluminum, and is good in high-frequency and power frequency shielding. Because the outdoor installation needs to be installed in the waterproof box body, the waterproof grade is IP68, and the working temperature range is as follows: -40 ℃ to 70 ℃.
In addition, the cable partial discharge monitoring system adopts LabVIEW software of a virtual instrument technology as a development platform of acquisition and analysis software, so that good implementation of an anti-interference technology is ensured. The system software can be divided into parameter setting, data acquisition, anti-interference processing, spectrogram analysis, trend analysis, data arrangement, report and other functions. The data acquisition part mainly completes the setting of the data acquisition card, such as a sampling period, a period maximum point, a sampling interval and the like. The acquisition software acquires data according to the set acquisition card parameters, and automatically sends the acquired data to the anti-interference software for processing.
Example 2:
on the basis of the embodiment 1, the embodiment 2 of the application provides a more specific offshore wind farm seabed high-voltage cable state monitoring system, which comprises a cable partial discharge monitoring system and a cable grounding current monitoring system; the cable partial discharge monitoring system monitors partial discharge of the cable terminal connector on line, simultaneously analyzes and pre-warns partial discharge monitoring data in real time, and remotely transmits analysis results of the partial discharge data to a remote master station through a station end unit; the cable grounding current monitoring system monitors the grounding current of the cable terminal connector.
The cable grounding current monitoring system mainly comprises a site transmitter, a remote monitoring terminal and a control center server. The operation state of the cable is monitored by monitoring the operation current of the cable and the current of the protective layer, the field bus is adopted to send monitoring data to the control center server in an optical cable mode, meanwhile, the control center server performs corresponding data analysis, management and fault judgment according to the field condition, a user can browse the operation state of the cable at each monitoring point through IE, and meanwhile, a fault alarm signal can be received through a mobile phone.
The cable ground current monitoring system architecture is shown in figure 4,
the system is divided into two parts, namely a data server part of a monitoring center and a monitoring part at the front end, wherein the data server is used for receiving the data from all monitoring points, analyzing the data, and storing and displaying the data. If abnormal data or alarm information exists, the wireless remote transmission device is started to send the alarm information to the mobile device, and related personnel are prompted to timely overhaul. The front end monitoring part mainly comprises a sheath circulation real-time monitoring device, a high-frequency pulse fault wave recording device and a wireless receiving and transmitting device. The following sections describe the constitution of the monitoring device.
The cable grounding current monitoring system is of a distributed structure, namely a cable joint partial discharge signal is subjected to gating, amplifying and collecting through high-speed collecting modules distributed at all monitoring points, converted into a digital signal, and the digital signal is transmitted to a data server through a local area network TCP/IP communication protocol, and the data server uniformly calculates and analyzes the signal.
Each cable joint is provided with a detection device, and each acquisition unit is distributed and installed near the tested cable joint equipment and is communicated with the data server in a digital communication mode through an optical fiber local area network. All monitoring data are stored in a database of a master station computer, and the database format meets the requirements of a state maintenance support platform of a national power grid company on the database format of an online monitoring system.
The submarine high-voltage cable state monitoring system of the offshore wind farm can continuously and online monitor the grounding current of the cable terminal, the running temperature of the cable and the partial discharge of the terminal connector for 24 hours, and timely and online monitor high-frequency signals, so that the insulation slow aging early warning of the cable outer sheath, the quick damage warning of the cable outer sheath, the joint insulation condition warning, the manual identification warning of main insulation high-frequency defects and the like are realized.
The cable grounding current monitoring system can effectively monitor whether the circulation of the cable metal sheath exceeds the standard, and timely discover external damage and positioning (precision: circulation unit) and timely discover the damage condition of the outer sheath such as seawater corrosion (precision: circulation unit) through monitoring the circulation change of the sheath. The cable grounding current monitoring system can integrate and effectively record the timing high-frequency waves, and timely find out the main insulation high-frequency defects of the line.
In addition, the offshore wind farm seabed high voltage cable condition monitoring system may further comprise: a cable thermometry system, the cable thermometry system comprising: the cable temperature measuring optical fiber, the cable distributed temperature measuring host and the control center can further realize abnormal alarm of joint fault temperature.
Further, the data management server is provided with high-voltage cable on-line monitoring system server version monitoring software which is used for receiving and processing the monitoring data transmitted by the acquisition unit and storing the monitoring data into a database for browsing by a user. The monitoring software can display the data and curves of all the detection points in real time, can define system parameters and set alarm parameters for all the detection points. The unique criteria for the insulation condition of the high voltage cable sheath used in the software has been used in a plurality of sites, solving a plurality of practical problems for users.
The background monitoring software adopts a Browser/Server structure, namely the system only needs to install and maintain a Server (Server) in a centralized control center, and the client adopts Browser running software to check and analyze the data measured by the system. The scheme for designing the monitoring software by utilizing the continuously mature WWW browser technology and combining various Script languages (VBScript, javaScript) is a brand-new software system construction technology. In the B/S architecture system, a user sends a request to a plurality of servers distributed on a network through a browser, the Server processes the request of the browser, information required by the user is returned to the browser, and other requests such as data query, analysis, result return, dynamic Web page generation, database access, application program execution and the like are all completed by the Web Server. It is apparent that B/S architecture applications represent a significant advance over conventional C/S architecture applications.
The main characteristics of the B/S structure are strong distribution, convenient maintenance, simple development, strong sharing and low overall design cost. The system has the advantages of general data security requirement and small data transmission quantity, so that the characteristics of the B/S structure can be fully exerted.
In this embodiment, the same or similar parts as those in embodiment 1 may be referred to each other, and will not be described in detail in the present disclosure.
Example 3:
on the basis of the embodiments 1 and 2, the embodiment 3 of the application provides a method for monitoring the state of a submarine high-voltage cable of an offshore wind farm, which comprises the following steps:
s1, carrying out on-line monitoring on the partial discharge level of a cable joint by utilizing a cable partial discharge monitoring system, analyzing and early warning partial discharge monitoring data in real time, and simultaneously transmitting the analysis result of the partial discharge data to a remote master station through a station end unit; positioning the cable line with the confirmed partial discharge source;
s2, monitoring the running current and the sheath current of the cable by using a cable grounding current monitoring system, determining the running state of the cable, transmitting monitoring data to a control center server in an optical cable mode by adopting a field bus, and simultaneously carrying out corresponding data analysis, management and fault judgment according to the field condition and alarming when the cable runs and fails.
S1 comprises the following steps:
obtaining a partial discharge signal through a partial discharge sensor;
the front end acquisition module is used for gating, amplifying, detecting and acquiring the local discharge signals, converting the final result into digital signals after calculating the final result, and transmitting the data to the data server through the optical fiber local area network communication protocol.
In S1, the positioning of the cabling with the confirmed partial discharge source is also performed, as shown in fig. 3, including:
the distance from the local discharge source to the left submarine cable joint is x1, the distance from the right submarine cable joint is x2, and the total length of the submarine cable body is L;
the partial discharge signals of the connectors on the left side and the right side are monitored through the grounding wire, the partial discharge pulse signals of the grounding wire on the left side are monitored after t1 time, and the partial discharge pulse signals of the grounding wire on the right side are monitored after t2 time; positioning the partial discharge source of the submarine cable body according to t1 and t2, and representing:
x1＝t1*L/(t1+t2),x2＝t2*L/(t1+t2)。
the method for monitoring the state of the submarine high-voltage cable of the offshore wind farm provided by the embodiment can further comprise the following steps: and S3, monitoring the joint temperature and giving an alarm when the joint temperature is abnormal.
Specifically, the method provided in this embodiment is a method corresponding to the system provided in embodiments 1 and 2, so that the portions in this embodiment that are the same as or similar to those in embodiments 1 and 2 may be referred to each other, and will not be described in detail in this disclosure.
Claims (10)
1. The submarine high-voltage cable state monitoring system of the offshore wind farm is characterized by comprising a cable partial discharge monitoring system and a cable grounding current monitoring system; the cable partial discharge monitoring system monitors partial discharge of the cable terminal connector on line, simultaneously analyzes and pre-warns partial discharge monitoring data in real time, and remotely transmits analysis results of the partial discharge data to a remote master station through a station end unit; the cable grounding current monitoring system monitors the grounding current of the cable terminal connector.
2. The offshore wind farm subsea high voltage cable condition monitoring system of claim 1, wherein the monitoring parameters of the cable partial discharge monitoring system comprise: the magnitude of the pulse amplitude and the value of the ground current on the ground line at the junction.
3. The offshore wind farm subsea high voltage cable condition monitoring system of claim 2, wherein the cable partial discharge monitoring system comprises a partial discharge sensor, a front end acquisition module, and a master station; the local discharge sensor is in communication connection with the master station through the front end acquisition module; the front-end acquisition module comprises a data acquisition unit, a signal conditioning unit, an optical fiber transmission unit and a power supply unit.
4. A offshore wind farm subsea high voltage cable condition monitoring system according to claim 3, wherein the cable ground current monitoring system comprises: the system comprises a field transmitter, a remote monitoring terminal and a control center server, wherein the operation state of a cable is monitored by monitoring the operation current of the cable and the current of a protective layer, monitoring data are sent to the control center server in an optical cable mode by adopting a field bus, and meanwhile, the control center server performs corresponding data analysis, management and fault judgment according to the field condition.
5. The offshore wind farm subsea high voltage cable condition monitoring system of claim 4, wherein the cable ground current monitoring system is integrated with a high frequency pulse fault logging device.
6. The offshore wind farm subsea high voltage cable condition monitoring system of claim 5, further comprising: a cable thermometry system, the cable thermometry system comprising: the cable temperature measurement optical fiber, the cable distributed temperature measurement host computer and the control center.
7. A method of offshore wind farm subsea high voltage cable condition monitoring performed by an offshore wind farm subsea high voltage cable condition monitoring system according to claims 1 to 6, comprising:
s1, carrying out on-line monitoring on the partial discharge level of a cable joint by utilizing a cable partial discharge monitoring system, analyzing and early warning partial discharge monitoring data in real time, and simultaneously transmitting the analysis result of the partial discharge data to a remote master station through a station end unit;
s2, monitoring the running current and the sheath current of the cable by using a cable grounding current monitoring system, determining the running state of the cable, transmitting monitoring data to a control center server in an optical cable mode by adopting a field bus, and simultaneously carrying out corresponding data analysis, management and fault judgment according to the field condition and alarming when the cable runs and fails.
8. The offshore wind farm subsea high voltage cable condition monitoring method of claim 7, wherein S1 comprises:
obtaining a partial discharge signal through a partial discharge sensor;
the front end acquisition module is used for gating, amplifying, detecting and acquiring the local discharge signals, converting the final result into digital signals after calculating the final result, and transmitting the data to the data server through the optical fiber local area network communication protocol.
9. The method for monitoring the state of a submarine high-voltage cable of a offshore wind farm according to claim 8, wherein in S1, positioning the cable line confirmed to have the partial discharge source is further performed, comprising:
the distance from the local discharge source to the left submarine cable joint is x1, the distance from the right submarine cable joint is x2, and the total length of the submarine cable body is L;
the partial discharge signals of the connectors on the left side and the right side are monitored through the grounding wire, the partial discharge pulse signals of the grounding wire on the left side are monitored after t1 time, and the partial discharge pulse signals of the grounding wire on the right side are monitored after t2 time; positioning the partial discharge source of the submarine cable body according to t1 and t2, and representing:
x1＝t1*L/(t1+t2),x2＝t2*L/(t1+t2)。
10. the offshore wind farm subsea high voltage cable condition monitoring method of claim 9, further comprising:
and S3, monitoring the joint temperature and giving an alarm when the joint temperature is abnormal.
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| CN202310996150.1A CN116930684A (en) | 2023-08-09 | 2023-08-09 | System and method for monitoring state of seabed high-voltage cable of offshore wind farm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117686783A (en) * | 2023-12-12 | 2024-03-12 | 武汉朗德电气有限公司 | High-voltage cable grounding current on-line monitoring device based on load dynamic management |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117686783A (en) * | 2023-12-12 | 2024-03-12 | 武汉朗德电气有限公司 | High-voltage cable grounding current on-line monitoring device based on load dynamic management |
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