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Advanced Wireless Three-Phase Sequence Analysis for High-Voltage Grids: Technical Evaluation of XZ-3 Phase Sequence Tester
The XZ-3 Wireless High-Voltage Digital Phase Sequence Tester represents a paradigm shift in high-voltage grid diagnostics, addressing critical operational challenges in three-phase power systems. Designed for live-line working environments (6 kV to 220 kV), this instrument integrates wireless transmission, precision phase analysis, and safety-enhanced functionalities to modernize phase sequence verification, phasing checks, and live-line voltage detection.
Core Technical Innovations
1. Triple-Channel Wireless Synchronization
The system employs three independent transmitters (X, Y, Z) and a central receiver, enabling simultaneous acquisition of phase angles (Φ) and frequency (f) from three conductors. Key advancements include:
Sub-130ms Latency RF Communication: Operates at >130m line-of-sight range with adaptive frequency hopping to mitigate industrial noise.
Phase-Locked Loop (PLL) Synchronization: Maintains μs-level timing alignment between transmitters, critical for sub-10° phase measurement accuracy.
2. Adaptive Phase Discrimination Algorithms
The host processor implements dual-phase decision logic:
Phase Sequence Determination:
Validates ABC sequence when pairwise phase differences (θ<sub>AB</sub>, θ<sub>BC</sub>, θ<sub>CA</sub>) = 120° ±10°
Triggers inverse sequence alert if θ deviation exceeds ±15° tolerance.
Phasing Judgment:
Classifies "same phase" for θ<30° (typical bus-tie applications)
Flags "different phase" for θ≥30° (breaker isolation verification).
3. High-Voltage Safety Architecture
Leakage Current Control: <10μA at 220kV through cascaded RC suppression (IEC 61481 compliant).
Transmitter Isolation: Class H insulation with 100kV/mm composite dielectric coating.
Dynamic Capacitive Coupling: Auto-adjusts electrode impedance (10pF–150pF) for 6–220kV compatibility.
Performance Specifications
Parameter | Value |
Phase Accuracy | ±10° (45–65Hz) |
Frequency Resolution | 0.01Hz (±0.1Hz traceable) |
Voltage Range | 6kV–220kV (phase-earth) |
Operating Temp | -35°C to +45°C (conformal coating for 95%RH) |
Power System | LiFePO<sub>4</sub> batteries (8hr continuous @0.4W RX /0.1W TX) |
Safety Compliance | GB/T 18268 (EMC), DL/T 971 (live working tools) |
Field Application Workflow
1.Pre-Deployment:
Validate transmitter insulation (≥500MΩ @5kV DC)
Confirm host/tx RFID pairing (anti-cross talk protocol).
2.Live-Line Measurement:
Deploy transmitters via hot-stick (IEC 61235 compliant)
Monitor real-time phase vector diagram on 2.4" TFT.
3.Data Interpretation:
Sequential voice alerts: "ABC Normal" / "Reverse Sequence"
Transient capture mode for switching transient analysis.
Comparative Advantages Over Legacy Systems
1.Eliminates PT/CT dependencies for direct phase measurement.
2.Reduces phasing time by 70% vs. oscilloscope methods.
3.Integrates contactless voltage detection (3pC sensitivity).
4.Complies with IEEE 516 guide for live-line tool clearances.
The XZ-3 redefines high-voltage phase management through its fusion of wireless telemetry, algorithmic phase analysis, and ruggedized field design. Its ≤10° uncertainty meets GB26859 grid code requirements for phasing verification, while the <30μA capacitive loading ensures negligible grid perturbation. For utilities modernizing O&M under smart grid paradigms, this tool provides critical infrastructure for safe, efficient three-phase asset management.
GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/
