GB/T 37543-2019 in English
VALIDMeasurement method for total electric field strength and ion current density of DC transmission line and converter station
- Issued on:2019-06-04
- Implemented on:2020-01-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 37543-2019直流输电线路和换流站的合成场强与离子流密度的测量方法》由TC246（全国电磁兼容标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
GB/T 37543—2019 Standard Overview
This standard specifies the measuring instruments, measurement methods and data processing requirements for the composite field strength and ion current density of DC transmission lines and converter stations. It is applicable to DC transmission lines and converter stations under normal operating conditions, and aims to ensure that the electromagnetic environment meets safety regulations.
Core Terminology Explanation
| Terms | Definition | Application Case |
|---|---|---|
| Composite Field Strength | The total electric field strength synthesized by the charge field on the charged conductor and the space charge field. | Used to evaluate the ground electric field distribution under the DC transmission line. |
| Ion current density | Ion flow current density per unit area, in nA/m². | Used to monitor the distribution of ion flow around the converter station. |
Measurement instruments and calibration technology
1. Working principle of field mill
Field mill consists of two coaxial circular sectors, which use the area change of periodic exposure to the electric field to generate induced current. By measuring the voltage drop on the resistor, the electric field strength can be calculated. Its structural schematic diagram is shown in Figure A.1.
2. Application of Wilson Board
Wilson board is used to collect charge and calculate ion flow density by measuring current. The size of the collection board is 1m×1m and it needs to be well grounded. Its schematic diagram is shown in Figure B.1.
Measurement Method and Implementation Recommendations
| Measurement Scenario | Specific Requirements | Precautions |
|---|---|---|
| Under the Transmission Line | - The measurement point should be selected in the center of the pole conductor span, and the distance from the ground projection should not exceed 50m. - Each measurement point should be no more than 5m apart. | - Avoid being close to trees and other power facilities. - Record meteorological conditions and line parameters. |
| Inside the converter station | - The measurement point is selected in the DC live area, such as the patrol walkway and the DC bus. - Keep a safe distance from the equipment (≥2.5m). | - Avoid approaching the inlet and outlet areas. |
Data processing and quality control
The measurement data needs to be counted by point and analyzed using probability statistics methods. Taking 100 data as an example, after sorting by absolute value, the 95th, 90th, 80th and 50th are taken as the evaluation basis. The maximum value, 80% value and 50% value are used as evaluation indicators for the ground composite field strength; the 90% value is used as the evaluation basis for the ion current density.
Background and significance of the standard
With the development of DC transmission technology, electromagnetic environment issues are becoming increasingly prominent. The formulation of this standard fills the gap in the electromagnetic environment measurement methods for DC transmission lines and converter stations, and provides an important basis for ensuring public health and equipment safety.
Implementation recommendations
- Instrument calibration: Regularly use standard devices to calibrate the field mill and Wilson plate to ensure measurement accuracy.
- Measurement conditions: Choose weather without rain or snow and with a wind speed of less than 2m/s for measurement, and record meteorological parameters.
- Data processing: Strictly analyze and evaluate the measurement data according to probability and statistical methods to avoid human errors.
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