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DL/T 2026-2019: General technical specification for monitoring system of HVDC earth electrode
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General technical specification for monitoring system of HVDC earth electrode
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Basic data | Standard ID | DL/T 2026-2019 (DL/T2026-2019) | | Description (Translated English) | General technical specification for monitoring system of HVDC earth electrode | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K40 | | Classification of International Standard | 29.240.99 | | Word Count Estimation | 13,112 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 191; GB/T 2423.1; GB/T 2423.2; GB/T 2423.4; GB/T 2423.10; GB/T 4208; GB/T 6587; GB/T 17626.2; GB/T 17626.3; GB/T 17626.8; GB/T 17626.9; DL/T 860.71; DL/T 860.81; DL/T 860.93; DL/T 860.905; DL/T 860.7410; DL/T 860.901; DL/T 860.801; DL/T 860.74; DL/T | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the system composition, system functions, technical requirements, detection methods, test methods, installation, commissioning, inspection, packaging and transportation of the HVDC grounding electrode monitoring system. This standard applies to the design, testing, installation and acceptance, operation and maintenance of the HVDC grounding electrode monitoring system. | DL/T 2026-2019: General technical specification for monitoring system of HVDC earth electrode---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
General technical specification for monitoring system of HVDC earth electrode
ICS 29.240.99
K 40
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
General technical specification for HVDC ground electrode monitoring system
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 General...2
5 System composition and functions...2
6 Technical requirements...3
7 Testing and test methods...4
8 Inspection rules...6
9 Installation and commissioning...7
10 Acceptance...8
11 Marking, packaging, transportation and storage...8
Appendix A (informative appendix)...10
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
Please note that certain contents of this standard may involve patents, and the issuing organization of this standard does not bear the responsibility for identifying these patents.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the High Voltage Direct Current Transmission Technology Standardization Technical Committee of the Power Industry.
The main drafting organization of this standard. State Grid Electric Power Research Institute Wuhan Nanrui Co., Ltd.
Participated in the drafting of this standard. China Electric Power Research Institute Co., Ltd., State Grid Shaanxi Electric Power Company Electric Power Research Institute, State Grid Sichuan
Provincial Electric Power Company Electric Power Research Institute.
The main drafters of this standard. Cai Wei, Gu Shanqiang, Tan Jin, Zhao Chun, Fang Yuhe, Tang Liangliang, Xu Xia, Liu Gang, Liao Cheng, Dong Xiaohui, Tan Bo,
Wu Min, Chen Kun, Yu Lina, Liu Xi, Zeng Shengqiang, Zheng Luyao, Bi Sheng, Wang Sen, Li Zhizhong, Liu Fan, Yang Lin, Dong Hanbin.
Opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Xuanwu District, Beijing)
One, 100761).
General technical specification for HVDC ground electrode monitoring system
1 Scope
This standard specifies the system composition, system functions, technical requirements, testing methods, test methods, installation, and
Commissioning, inspection, packaging and transportation, etc.
This standard applies to the design, testing, installation and acceptance, operation and maintenance of high-voltage DC ground electrode monitoring systems.
2 Normative references
The following documents are indispensable for the application of this standard. For dated reference documents, only the dated version applies to this standard.
For undated reference documents, the latest version (including all amendments) is applicable to this standard.
GB/T 191 Packaging, storage and transportation pictorial signs
GB/T 2423.1 Environmental testing of electrical and electronic products Part 2.Test method Test A Low temperature
GB/T 2423.2 Environmental testing of electrical and electronic products Part 2.Test method Test B. High temperature
GB/T 2423.4 Environmental testing of electrical and electronic products Part 2.Test method Test Db. Alternating damp heat (12h + 12h cycle)
GB/T 2423.10 Environmental testing of electrical and electronic products Part 2.Test method Test Fc. Vibration (sinusoidal)
GB/T 4208 Enclosure protection grade (IP code)
GB/T 6587 General Specification for Electronic Measuring Instruments
GB/T 17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test
GB/T 17626.3 Electromagnetic compatibility test and measurement technology Radio frequency electromagnetic field radiation immunity test
GB/T 17626.8 Electromagnetic compatibility test and measurement technology Power frequency magnetic field immunity test
GB/T 17626.9 Electromagnetic compatibility test and measurement technology Pulse magnetic field immunity test
DL/T 860 Power Automation Communication Network and System
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
HVDC earth electrode
The grounding device that can continuously deliver direct current to the high-voltage direct current system is composed of several groups of grounding conductors and active filling materials. installed at
The ground electrode on land is called the land ground electrode; the ground electrode installed in the sea or coast is called the marine or coastal ground electrode.
3.2
Monitoring system of HVDC earth electrode
It can automatically collect data on the operating state of the DC ground electrode, and send the data to the monitoring unit for data processing through the communication unit
measuring system.
3.3
Earth electrode site
The geographical location of the ground electrode.
3.4
Data acquisition unit
Collect the operating parameters of the ground electrode through the measuring and monitoring devices installed on the ground electrode site, and convert the analog signal to digital
Signal unit.
3.5
Remote monitoring unit
Integrated communication control, database platform and information release functions, used to receive, store, process and display various monitoring data, for grounding
The pole monitoring system provides a unit of human-computer interaction interface.
3.6
Communication unit
The unit that transmits the data information collected by the data acquisition unit to the monitoring unit and receives instructions from the monitoring unit.
3.7
Power supply unit
A device that provides power to the data acquisition unit, communication unit and other equipment in the ground electrode monitoring system.
3.8
Step voltage
When the high-voltage DC grounding electrode is operating, the voltage between any two points of the human body touching the ground and a horizontal distance of 1m. Unit V.
3.9
Ampere-hour
Integral of grounding electrode current and running time.
4 General
4.1 The high-voltage DC grounding electrode monitoring system shall meet the technical requirements of the design and operating conditions of the high-voltage DC grounding electrode.
4.2 The high-voltage DC grounding electrode monitoring system shall meet the environmental protection requirements of the current regulations.
5 System composition and function
5.1 System composition
The high-voltage DC grounding electrode monitoring system should consist of a data acquisition unit, a communication unit, a monitoring unit and a power supply unit (see Appendix A).
5.2 System function
The HVDC ground electrode monitoring system shall have the following functions.
a) Automatically collect the operating state data of the high-voltage DC grounding electrode through the data acquisition unit, which should include the grounding current of the grounding electrode, soil
Temperature and humidity and remote video monitoring, real-time measurement of step voltage, monitoring well water level, water temperature, and central area equipment temperature can be increased according to demand;
b) The operation status data is transmitted to the converter station monitoring unit through the communication unit;
c) Real-time display, statistical analysis and storage of operating status data through the monitoring unit, and remote video monitoring and security
Protection
d) The power supply unit provides reliable power for the HVDC ground electrode monitoring system.
6 Technical requirements
6.1 Operating environment conditions
a) Ambient temperature. ground equipment -40℃～55℃, underground equipment -10℃～90℃;
b) Relative humidity. 5%～100%;
c) Atmospheric pressure. 55kPa～106kPa.
6.2 Performance requirements
6.2.1 Data acquisition unit
a) Current monitoring device. the resolution is not less than 0.1A, and the error is not more than ±(reading*5% 0.1A);
b) Step voltage monitoring device. non-polarized electrode should be used for measurement, the resolution is not less than 0.1V, and the error is not more than ±0.05V;
c) Water level and water temperature monitoring device. the water level resolution is not less than 1cm, the error is not more than ± (range*0.2%); the water temperature resolution is not less than
0.1℃, the error is not more than ±0.5℃;
d) Central area equipment temperature monitoring device. resolution is not less than 0.1℃, error is not more than 1.0℃;
e) Soil temperature monitoring device. the temperature resolution is not less than 0.1℃, and the error is not more than ±0.4℃;
f) Soil moisture monitoring device. the humidity resolution is not less than 0.1%, and the error is not more than ±3%;
h) Central area safety protection monitoring device. an alarm signal for breaking or short circuit is issued within 3s, with more than 2 defense zones; pulse peak value 5000 V～
10000V, pulse period 1s～1.5s, pulse duration ≤0.1s, pulse maximum power ≤2.5mC, pulse maximum energy ≤5J;
i) Acquisition frequency. the frequency of real-time measurement of step voltage, monitoring well water level, water temperature, soil temperature and humidity, and equipment temperature in the central area is not low
At 1 time/minute; the data of video monitoring and infrared image monitoring are continuously uploaded; the current monitoring device is in the grounding pole bipolar balance operation mode
The current collection frequency is not less than 1 time/minute, and the current collection frequency in the grounded pole single-max operation mode is not less than 1 time/second; the central area is safe
The protection monitoring device keeps the standby state, and transmits the alarm information to the monitoring unit remotely after being triggered.
6.2.2 Communication unit
a) The high-voltage DC ground electrode monitoring system should adopt a standard and reliable communication network that meets the requirements for monitoring data transmission;
b) A unified communication protocol should be selected between the data acquisition unit and the monitoring unit, generally a communication protocol that conforms to the DL/T 860 standard,
And use 1000M and above high-speed Ethernet or optical fiber as the communication channel;
c) The monitoring unit should have the function of communicating with the converter station monitoring system.
6.2.3 Power supply unit
a) The power supply of the system should adopt the external mains power supply, and the solar photovoltaic power generation power system can be used when the external mains power supply is not available.
The power supply must meet the electricity demand of the ground electrode monitoring system equipment. Consider the local sunshine situation throughout the year to carry out the solar photovoltaic power generation system
Designed to ensure continuous power supply for at least 7 rainy days;
b) The battery pack or UPS power supply shall be equipped to maintain the continuous operation of the data acquisition unit and communication unit in the event of an interruption of the external power supply of the system.
Not less than 24 hours;
c) The power supply unit should be equipped with a power supply condition monitoring system, and the monitoring signal is transmitted to the background monitoring unit.
6.2.4 Monitoring unit
a) The storage capacity of the monitoring server should be expandable. When the acquisition unit generates data with the highest acquisition frequency, the video surveillance data
Data and infrared image data can be stored for at least 30 days, and other monitoring data can be stored for at least 1 year;
b) The monitoring unit has the ability to process, store and display the monitoring data, and according to the needs of the user, the ground electrode state parameters (feedback
Electric cable current, step voltage, monitoring well water level, water temperature, soil temperature, soil humidity, central area equipment temperature, central area safety protection alarm
Signal) function to generate daily, weekly, monthly and daily curves, weekly curves, and monthly curves;
c) After detecting the grounding electrode operating state and monitoring equipment abnormality, the monitoring unit can immediately carry out alarm processing, and it should have the most basic sound
Light alarm effect (screen flashing, audible sound), and other alarm functions can be expanded at the same time, such as transmitting alarm information to the on-duty personnel through the network
Or the specified user.
6.3 Electromagnetic compatibility
a) Electrostatic discharge immunity, in accordance with the test level specified in GB/T 17626.2, is a contact discharge test of level 4, and the test result evaluation should reach
To level a;
b) The radio-frequency electromagnetic field radiation immunity is in accordance with the test level 3 specified in GB/T 17626.3.
The test result evaluation should reach a level;
c) Power frequency magnetic field immunity test, in line with the power frequency magnetic field immunity test of level 5 specified in GB/T 17626.8, the test results are evaluated
Must reach a grade;
d) Impulse magnetic field immunity, in line with the impulse magnetic field immunity test of level 5 as specified in GB/T 17626.9, the test results are evaluated
Must reach a level.
6.4 Appearance and structure
a) The structure of each unit device should be complete; the metal surface should be free of rust, cracks, and coating peeling; plastic parts should be free of bubbles, cracks, deformation and
Pouring material overflow phenomenon; the text and mark on the surface of the device should be clear;
b) The enclosure protection level of each part of the monitoring system shall meet the IP65 level requirements specified in GB/T 4208.
6.5 Mechanical properties
6.5.1 Vibration performance
Each unit device should be able to withstand the vibration test specified in GB/T 2423.10.After the test, there should be no damage to each unit device and loose or loose fasteners.
It can work normally.
6.5.2 Transport performance
After the product is packaged, the transport test is carried out in accordance with the provisions and methods of GB/T 6587, and it can withstand the transport test of class II in Table 1 of the standard (package
Including free fall, roll test). After the test, the system should work normally.
6.6 Operational reliability
The grounding electrode monitoring system should have functions such as self-checking and fault isolation, and should be able to work continuously, accurately and reliably, and be able to adapt to the
Should work environment, the mean time between failures (MTBF) should not be less than 25000h. The average annual data missing rate should not be greater than 1%.
7 Testing and test methods
7.1 Test environment
Except for environmental impact test and field test, other test items should be carried out in the following test environment.
a) Ambient temperature. 15°C～35°C;
b) Relative humidity. 45%～75%;
c) Atmospheric pressure. 80kPa～110kPa;
d) Power supply voltage. single-phase 220V (1±5%);
e) Power frequency. 50Hz±0.2Hz;
f) Power supply waveform. sine wave, waveform distortion is not more than 5%.
7.2 Basic function inspection
The high-voltage DC grounding electrode monitoring system shall be formed according to the product manual and the on-site configuration method, and the monitoring system shall be energized and corresponding signals shall be applied
Check whether the monitoring system has various functions, and conduct the following tests.
a) Input simulation parameters and check whether the output value of the system meets various performance requirements;
b) Set several abnormal values to check the alarm function of the monitoring system;
c) Set faults and check the self-check function of the monitoring system.
7.3 Electromagnetic compatibility test
7.3.1 Electrostatic discharge immunity test
According to the provisions of GB/T 17626.2, and under the following conditions.
a) The monitoring system is in normal working condition;
b) Contact discharge;
c) The enclosure and the parts that may be touched by the staff;
d) Test voltage. 8kV;
e) Discharge of positive and negative polarity 10 times each, with an interval of at least 1s between each discharge.
During and after the test, the system should work normally.
7.3.2 Radio frequency electromagnetic field radiation immunity test
According to the provisions of GB/T 17626.3, and under the following conditions.
a) The monitoring system is in normal working condition;
b) Frequency range. 80MHz～1000MHz;
c) Test field strength. 10V/m.
During and after the test, the system should work normally.
7.3.3 Pulse magnetic field immunity test
According to the provisions of GB/T 17626.9, and under the following conditions.
a) The monitoring system is in normal working condition;
b) Magnetic field strength. 1000A/m.
During and after the test, the system should work normally.
7.3.4 Power frequency magnetic field immunity test
According to GB/T 17626.8, and under the following conditions.
a) The monitoring system is in normal working condition;
b) Magnetic field strength. 100A/m.
During and after the test, the system should work normally.
7.4 Climate protection test
7.4.1 High temperature test
According to the test requirements and test methods specified in GB/T 2423.2, the ground equipment should be able to withstand a temperature of 55℃, and the underground equipment should be able to withstand
A high temperature test with a temperature of 90℃ and a duration of 16h. During and after the test, the system should work normally.
7.4.2 Low temperature test
According to the test requirements and test methods specified in GB/T 2423.1, the ground equipment should be able to withstand the temperature -50℃, and the underground equipment should be able to withstand
Low temperature test with temperature of -10℃ and duration of 16h. During and after the test, the system should work normally.
7.4.3 Alternating damp heat test
Carry out according to the test requirements and test methods specified in GB/T 2423.4, the high temperature is 55℃, the test cycle is 24h, and the in-situ recovery is 2h.
During and after the test, the system should work normally.
7.5 Appearance and structure
7.5.1 Appearance
The visual appearance should be neat and without obvious scratches.
7.5.2 Structure
According to the method specified in GB/T 4208, each unit of the monitoring system shall be tested with a protection level of IP65.After the test, each unit should be able to
Work often.
7.6 Mechanical performance test
7.6.1 Vibration test
The monitoring system is not packaged or powered, and is fixed in the center of the test bench. The test is carried out in accordance with the provisions of GB/T 2423.10.
a) Frequency range. 10Hz～55Hz;
b) Peak acceleration. 10m/s2;
c) Frequency sweep cycle times. 5 times;
d) Duration of dangerous frequency. 10min±0.5min.
After the test, check that the monitoring system under test should be free from damage and loose fasteners. The system should be able to work normally after power on.
7.6.2 Transport test
a) After packaging, the product should be tested in accordance with the provisions of GB/T 6587, and it can withstand the transport test of class II in Table 1 of the standard (including free
Drop and roll test). After the test, the system should work normally;
b) After the product is packaged, it should be able to withstand the transportation test of GB/T 6587, which is a third-level road intermediate road surface. After 2h test time, the system
The system should work normally.
8 Inspection rules
8.1 Type test
8.1.1 Test rules
In any of the following situations, a type test is required.
a) When a new product is finalized or an old product is transferred to a factory or production is resumed after a long-term shutdown;
b) For continuous mass production, once every 3 years;
c) If there are major changes in design, process, materials, and components that may affect product performance;
d) When there is a big difference between the factory inspection result and the last type test.
8.1.2 Sampling plan
The samples for type test shall be randomly selected from three samples from the qualified products of the factory inspection.
8.1.3 Test items
Type test items are shown in Table 1.
8.1.4 Judgment rules
If there are unqualified items in the type test results, double sampling can be carried out to re-inspect the unqualified items. If there are still unqualified items, the type shall be judged
The test failed.
Type testing must be carried out by a third-party testing agency with relevant qualifications, and a qualified testing report should be issued.
8.2 Factory inspection
The instruments should be inspected one by one. The items and order of the factory inspection are shown in Table 1.Unqualified items are not allowed.
8.3 Acceptance test
8.3.1 The purchaser shall conduct sampling inspection on the delivered HVDC ground electrode monitoring system according to batches.
8.3.2 Check whether the product qualification certificates, factory test reports and instructions of each unit are complete and qualified. The test items are shown in Table 1.
8.3.2 Acceptance shall be carried out by test personnel with relevant qualifications from both parties at the installation site, and an acceptance report shall be issued.
9 Installation and commissioning
9.1 Installation requirements
9.1.1 Installation requirements of the data acquisition unit
a) The temperature monitoring device in the central area shall ensure the full coverage of equipment monitoring in the central area of the ground electrode;
b) Each feeder cable should be equipped with 1 set of current sensors. The current sensor should be placed at the female end of the busbar or the end of the feeding element in the center of the pole site;
Each set of current sensors should be equipped with a protective cover made of stainless steel to prevent damage from external forces;
c) According to the simulation calculation or debugging results, select a suitable area to install the step voltage sensor;
d) Electronic fence installation should ensure full coverage of the central area of the grounding electrode;
e) The equipment installation should not affect the normal grounding electrode maintenance work;
f) The installation of the monitoring device should be neat and firm, with corresponding protective measures;
g) All cables should be laid through pipes.
9.1.2 Communication unit installation requirements
According to the conditions of the ground electrode, the ground electrode line OPGW or mobile communication network, point-to-point communication network, etc. can be used as the communication channel. Jotze
OPGW is used as the communication channel. The optical fiber layout in the converter station should be laid in the cable well according to the specifications, from the grounding pole terminal tower to the main converter station.
Control room.
9.1.3 Installation requirements for power supply unit
The power supply unit should be installed in the central area of the grounding electrode. If an external power supply system is used, it should comply with relevant installation specifications.
9.1.4 Installation requirements for monitoring unit
The monitoring unit should be installed in the main control room, and a special grounding electrode monitoring system station should be set up for the converter station staff to check at any time.
9.2 Commissioning requirements
a) Preliminary debugging of the monitoring system according to the requirements of 7.2;
b) Use iron wire to short-circuit the electronic fence to simulate the invasion of foreign objects and observe whether the electronic fence alarms;
c) Operate the video camera to rotate, focus, and detect whether it meets the technical requirements in the background of the system through the monitoring unit;
d) The monitoring unit can operate and use each functional module according to the system manual to detect whether the relevant functional requirements are met.
10 Acceptance
10.1 After all devices have been installed and debugged on site, they should be confirmed by the supplier and the customer as required.
10.2 The acceptance shall be carried out within 1 month of system operation.
10.3 The acceptance report is composed of acceptance opinions, possible rectification data and related technical reports. The technical report should at least include the grounding electrode monitoring system.
Project design report, installation and commissioning report and operation report.
11 Marking, packaging, transportation and storage
11.1 Logo
11.1.1 Product mark
Each ...
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