トップ 10 変圧器ブッシング監視システム メーカー: 2025 版

Executive Summary: Top Picks

1. フジノ: Offers high-precision Fiber Optic Temperature Sensors (足), potentially valuable for monitoring bushing connection points where EMI immunity is crucial, complementing core dielectric monitoring.
2. 動的評価: A leading provider specializing in online condition monitoring systems for transformers and bushings, focusing on capacitance, だからデルタ (力率), and partial discharge (PD).
3. クアリトロール: Offers a comprehensive portfolio including Iris Power solutions for online PD monitoring and Serveron DGA (for OIP bushings), along with other transformer asset monitoring capabilities.
4. ドゥーブル・エンジニアリング・カンパニー: Renowned expert in electrical apparatus testing and monitoring, 提供する advanced online systems for bushing diagnostics, including capacitance/power factor and PD analysis.
5. ラインハウゼン機械工場 (氏) / メスコ: Known for transformer components (OLTCs), also provides monitoring systems (例えば, MSense BM) for online assessment of bushing condition (C/PF).

導入

Transformer bushings are essential components that provide an insulated pathway for electrical conductors to pass through the grounded transformer tank. They operate under high electrical and mechanical stress and are among the leading causes of transformer failures. Bushing failures can be catastrophic, often resulting in violent explosions, tank ruptures, 火災, and extensive collateral damage. Continuous online monitoring of bushing condition is therefore increasingly recognized as a critical strategy for preventing such failures, ensuring personnel safety, そして維持 電力システムの信頼性. This guide introduces the fundamentals of bushing monitoring and ranks the top 10 manufacturers providing online monitoring systems and key technologies in 2025.

What are Transformer Bushings?

あ transformer bushing is an electrical insulator that allows a conductor carrying high voltage current to pass safely through the grounded metal enclosure (タンク) of a transformer. It must provide adequate insulation between the conductor and the tank under various operating and environmental conditions. Common types include Oil-Impregnated Paper (OIP), 樹脂含浸紙 (RIP), Resin-Impregnated Synthetics (RIS), and SF6 gas-insulated bushings, each with different construction and characteristics.

Why Monitor Transformer Bushings?

• 致命的な障害を防ぐ: Bushing failures are often sudden and explosive, leading to transformer destruction, 火災, and significant safety risks. オンラインモニタリング aims to detect deteriorating conditions before failure occurs.
• Avoid Costly Downtime & Damage: A bushing failure nearly always results in a forced outage and extensive repair costs, potentially including transformer replacement and environmental cleanup.
• Enable Condition-Based Maintenance: Monitoring allows maintenance interventions (like cleaning, テスト, または交換) to be scheduled based on the actual condition of the bushing, rather than just time-based intervals.
• Improve Personnel Safety: Detecting incipient faults allows for de-energization and repair before a dangerous failure occurs.
• Optimize Asset Management: Understanding bushing health contributes to overall transformer condition assessment and fleet management decisions.

How Transformer Bushing Monitoring Systems Work

Online monitoring systems assess bushing health by tracking key parameters indicative of insulation degradation or other developing problems:

Online Capacitance & Tan Delta / 力率

This is the most widely used and effective method for assessing the overall condition of the bushing’s main insulation. の system measures changes in capacitance (C1) and Tan Delta (also known as Dissipation Factor or Power Factor) under operating conditions. An increase in capacitance or Tan Delta typically indicates insulation degradation, 湿気の侵入, または汚染. Monitoring systems usually utilize the bushing’s voltage tap (if available) or specialized sensors/adapters installed at the tap or flange to derive voltage and leakage current signals for analysis. Companies like Dynamic Ratings, クアリトロール, Doble, and MR are leaders in this area.

オンライン部分放電 (PD)

PD monitoring detects small 電気 discharges occurring within voids or defects in the insulation system. Persistent PD activity indicates an active insulation breakdown process that can eventually lead to complete failure. Online systems use sensors like High Frequency Current Transformers (HFCT) installed around the bushing ground connection, UHFアンテナ, or acoustic sensors mounted on the transformer tank to detect the signals generated by discharges. Analysis of PD patterns (例えば, PRPD – Phase Resolved 部分放電) helps diagnose the type and severity of the defect. クアリトロール (Iris Power), Doble, オミクロン, Altanova, and Power Diagnostix are key players.

温度監視 (接続)

While not a primary indicator of internal insulation health, monitoring the temperature of the external connections at the top terminal and sometimes the flange is important. Overheating connections indicate high resistance due to looseness or corrosion, which can lead to failure and potentially damage the bushing itself. 赤外線 (そして) カメラ (periodic or fixed) are commonly used. 光ファイバー温度センサー (足), like those from FJINNO, could also be applied to these connection points, offering immunity to the strong electric fields present near the bushing terminal.

溶存ガス分析 (DGA) for OIP

For Oil-Impregnated Paper (OIP) ブッシング, analyzing the gases dissolved in the bushing’s insulating oil can provide diagnostic information, similar to main tank DGA. しかし, dedicated online DGA monitors specifically for bushings are less common than main tank monitors but offered by some specialists like Qualitrol (セルベロン).

その他の監視方法

Monitoring oil level in OIP bushings using gauges or sensors is crucial to detect leaks. Visual inspections (for cracks, 油漏れ, 汚染) remain an important part of maintenance.

トップ 10 変圧器ブッシング監視システム メーカー

This list focuses on manufacturers providing online monitoring systems targeting the primary failure modes of bushings (insulation degradation via C/PF and PD) and relevant complementary technologies like connection 温度監視.

よくある質問 (よくある質問)

What is the difference between Tan Delta and Power Factor monitoring for bushings?

Tan Delta (or Dissipation Factor) and Power Factor are mathematically related ways to quantify the dielectric losses in an insulator. Both increase as insulation degrades or absorbs moisture. Tan Delta is the ratio of resistive current to capacitive current, while Power Factor is the cosine of the phase angle between voltage and total current. For the low loss angles found in healthy bushings, their values are very similar.

Why is online bushing monitoring preferred over offline testing?

Offline tests require taking the transformer out of service, which is costly and infrequent. オンラインモニタリング provides continuous data under real operating conditions (電圧, 温度, 負荷), allowing for trend analysis and detection of rapidly developing faults that might occur between offline tests.

Can Partial Discharge (PD) monitoring predict the exact time of bushing failure?

PD モニタリングは、断熱材内で進行中の劣化が発生していることを示します. PD レベルの増加や PD パターンの変化は、失敗のリスクが増大していることを強く示唆していますが、, 故障までの正確な時間を予測することは一般に不可能です. 介入を調査し計画するための重要な警告として機能します.

How are 通常、オンライン容量/力率監視用に設置されるセンサー?

最新の高電圧ブッシングのほとんどには、電圧またはテストタップが付いています。. 監視システムはこのタップに接続します (多くの場合、特殊なアダプター/センサーを介して) に システム電圧に対する漏れ電流を測定します. タップなしブッシュ用, 外部センサーまたはアンテナベースの方法が使用される場合があります, ただし精度が低くなる可能性があります.

は 温度監視はブッシングの内部絶縁にとって重要です 健康?

Temperature itself is not the primary indicator of internal insulation degradation; Capacitance/Power Factor and PD are more direct measures. しかし, the temperature of the external connections is critical, as overheating there can lead to failure. Also, extreme bushing body temperatures could potentially indicate severe internal issues or cooling problems (for OIP types), but this is usually a secondary indicator.

結論と推奨事項

Online monitoring of transformer bushings has transitioned from a niche practice to an essential element of modern transformer asset management. Given the potentially catastrophic consequences of a bushing failure, investing in systems that track key indicators like Capacitance/Power Factor and Partial Discharge provides significant value in preventing failures, enhancing safety, and optimizing maintenance. Complementary monitoring of connection temperatures further strengthens the diagnostic picture.

の manufacturers listed represent the forefront of online bushing monitoring technology, offering sophisticated systems capable of detecting incipient faults under real-world operating conditions.

免責事項: このガイドは、4 月時点で公開されているデータと検索結果に基づいた一般的な情報を提供します。 2025. テクノロジー, 市場でのポジション, 会社の提供内容は変更される可能性があります. The primary methods for assessing internal bushing health are typically Capacitance/Power Factor and Partial Discharge monitoring. 温度監視 is often focused on connections. Always consult directly with manufacturers and qualified engineers to determine the most appropriate monitoring strategy for your specific assets and operational context.

 

光ファイバー温度センサー, インテリジェント監視システム, 中国の分散型光ファイバーメーカー