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๐ก IEC 60495: SSB Power Line Carrier Terminals โ Phoning Home Over High-Voltage Lines
📅 Standard: IEC 60495:1993 | 🔗 Prepared by: IEC TC 57 — Power System Communication
Single-sideband (SSB) power line carrier terminals transmit voice and data over high-voltage power lines. IEC 60495 specifies performance requirements and test methods for SSB-PLC terminals.
📋 SSB-PLC Key Parameters
| 📡 Parameter | 📋 Typical Value |
|---|---|
| Carrier band | 30–500 kHz |
| Transmit power | 10–80 W (PEP) |
| Modulation | SSB suppressed carrier |
| Bandwidth | 2.5 kHz / 4 kHz |
⚡ Engineering Insight
⚠️ Engineering Insight: The most distinctive challenge in SSB-PLC is line noise. Corona discharge, insulator partial discharge, and circuit-breaker transients on the HV line inject impulse noise directly into the PLC receive band. IEC 60495 mandates sensitivity measurement at a specified signal-to-noise ratio (typically 15–20 dB SINAD), not at raw signal level — because on an HV line, you can amplify the signal, but the noise is always there. As PLC engineers say: “Signal strength isn’t the problem — noise is.”
🔑 The bottom line: IEC 60495 turns HV transmission lines into communication channels — but it’s the world’s noisiest channel. Designing PLC terminals means fighting electromagnetic noise generated by the very equipment the line powers.
