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Transformer online monitoring devices are crucial for real-time tracking of a transformer’s operating status, enabling early detection of potential faults and ensuring reliable operation. Here are the main types:
Oil Quality Monitoring Devices
- Analisis Gas Terlarut (DGA) Sistem: Continuously monitor gases dissolved in transformer oil (such as methane, etana, etilen, asetilen). Abnormal gas concentrations or ratios indicate insulation degradation (misalnya, partial discharge or overheating), helping predict faults like arcing or thermal breakdown.
- Moisture-in-Oil Sensors: Measure water content in oil. Excessive moisture reduces insulation strength, meningkatkan risiko flashover. Real-time data helps maintain oil dryness through dehydration systems.
- Oil Temperature and Level Monitors: Track oil temperature (critical for load management) dan tingkat minyak (to detect leaks). Sudden temperature rises or level drops trigger alarms.
Insulation Monitoring Devices
- Pelepasan Sebagian (PD) Monitor: Mendeteksi pelepasan sebagian dalam isolasi (misalnya, pada belitan atau bushing) menggunakan sensor (ultrasonik, elektromagnetik, atau UHF). Aktivitas PD mempercepat penuaan isolasi, dan deteksi dini mencegah kegagalan besar.
- Monitor Resistansi Isolasi: Ukur resistansi isolasi belitan, busing, dan inti. Penurunan bertahap menunjukkan kerusakan isolasi, memungkinkan pemeliharaan tepat waktu.
Perangkat Pemantau Gulungan dan Inti
- Sensor Suhu Serat Optik Fluoresen: Seperti yang telah dibahas sebelumnya, ini secara langsung mengukur suhu titik panas yang berkelok-kelok dengan presisi tinggi, tidak terpengaruh oleh interferensi elektromagnetik. Penting untuk mencegah insulasi menjadi terlalu panas.
- Pemantau Arus Inti Inti: Pantau arus di kabel ground inti. Arus tidak normal (di atas beberapa mA) menunjukkan masalah isolasi inti (misalnya, beberapa titik dasar), yang dapat menyebabkan panas berlebih lokal.
Perangkat Pemantau Bushing dan Tap Changer
- Sistem Pemantauan Bushing: Ukur kapasitansi bushing, tanδ (kerugian dielektrik), dan suhu. Perubahan parameter ini menandakan degradasi isolasi, reducing the risk of bushing failures.
- Pengubah Ketuk Saat Dimuat (OLTC) Monitor: Track OLTC operation (misalnya, keausan kontak, kualitas minyak, and mechanical status) via vibration analysis, current/power monitoring, and oil DGA. Ensures smooth voltage regulation and extends OLTC life.
Gas and Pressure Monitoring Devices
- Relai Gas (Relai Buchholz): A traditional but essential device. It detects gas accumulation or oil flow caused by internal faults (misalnya, sirkuit pendek), triggering alarms or tripping the transformer to prevent damage.
- Tank Pressure Monitors: Monitor the pressure inside the transformer tank. Sudden pressure spikes indicate severe internal faults (misalnya, pencetusan), enabling rapid shutdown.
External Environment Monitoring Devices
- Ambient Temperature and Humidity Sensors: Track the environment around the transformer. High humidity combined with dust can lead to surface insulation issues, while extreme temperatures affect cooling efficiency.
- Security and Vibration Sensors: Detect unauthorized access, vandalism, or abnormal vibrations (indicating loose components or structural issues), enhancing overall transformer safety.
Communication and Integration Systems
Most online monitoring devices connect to a central SCADA (Pengendalian Pengawasan dan Akuisisi Data) system or a dedicated transformer monitoring platform. Data is analyzed in real-time, with trends tracked to predict maintenance needs, enabling condition-based rather than scheduled maintenance.
These devices work together to provide a comprehensive view of a transformer’s health, minimizing downtime and maximizing operational efficiency.
Sensor suhu serat optik, Sistem pemantauan cerdas, Produsen serat optik terdistribusi di Cina
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