QX/T 577-2020 in English
VALIDTechnical requirements for online monitoring of lightning protectiongrounding resistance
- Issued on:2020-07-31
- Implemented on:2020-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
Introduction
Analysis of the standard technical framework
QX/T 577-2020 builds a three-layer monitoring system consisting of a measurement and data acquisition subsystem, a communication and network subsystem, and a terminal display subsystem. The measurement subsystem uses a DC pulse or sinusoidal AC current test method, with an accuracy requirement of ±(2%+2d).
Comparison of core performance indicators
| Technical parameters | Requirements of this standard | General testing requirements |
|---|---|---|
| Measuring range | 0-2000Ω | 0-1000Ω |
| Measurement accuracy | ≤2%+2d | ≤5% |
| Self-calibration period | ≤3 months | 6-12 months |
Key technical innovations
1. Dynamic threshold alarm: When the ground resistance value exceeds the set threshold, the system will give a real-time alarm through sound and light, and record complete information such as abnormal time and location.
2. GIS visualization platform: The standard recommends using geographic information system as the basic platform to realize the spatial distribution display and data association analysis of monitoring points.
3. Anti-interference design: The test electrode is required to be made of galvanized round steel/stainless steel, with a burial depth of ≥20cm and a wire cross-sectional area of ≥1.5mm², which effectively reduces environmental interference.
Implementation points
Installation specifications: The monitor needs to be installed outdoors with a windproof and rainproof box, with a height of 1.5-1.8m; flammable and explosive sites need to meet the explosion-proof requirements of GB50058.
Debugging requirements: The system needs to run stably for 168 hours continuously before conducting comparative tests, and the test electrode layout should be optimized.
Standard application scenarios
Applicable to grounding device monitoring with an equivalent area of <5000㎡, especially suitable for substations, communication base stations, petrochemical facilities and other places where the grounding status needs to be monitored in real time. The case shows that after application in a certain wind farm, the efficiency of lightning fault location increased by 70%.
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