Sayfanın Üstü 10 Transformer Bushing Monitoring System Manufacturers: 2025 Edition

Executive Summary: Top Picks

1. FJINNO (JINNO): Offers high-precision Fiber Optic Temperature Sensors (FOTS), potentially valuable for monitoring bushing connection points where EMI immunity is crucial, complementing core dielectric monitoring.
2. Dynamic Ratings: A leading provider specializing in online condition monitoring systems for transformers and bushings, focusing on capacitance, tan delta (power factor), ve kısmi deşarj (PD).
3. Nitelik: 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. Doble Engineering Company: Renowned expert in electrical apparatus testing and monitoring, providing advanced online systems for bushing diagnostics, including capacitance/power factor and PD analysis.
5. Maschinenfabrik Reinhausen (MR) / Messko: Known for transformer components (OLTCs), also provides monitoring systems (Örneğin;, MSense BM) for online assessment of bushing condition (C/PF).

Giriş

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, fires, 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, and maintaining power system reliability. 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?

A transformer bushing is an electrical insulator that allows a conductor carrying high voltage current to pass safely through the grounded metal enclosure (tank) 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), Resin-Impregnated Paper (RIP), Resin-Impregnated Synthetics (RIS), and SF6 gas-insulated bushings, each with different construction and characteristics.

Why Monitor Transformer Bushings?

• Prevent Catastrophic Failures: Bushing failures are often sudden and explosive, leading to transformer destruction, fires, and significant safety risks. Online monitoring 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, testing, or replacement) 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 / Power Factor

This is the most widely used and effective method for assessing the overall condition of the bushing’s main insulation. bu 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, moisture ingress, or contamination. 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, Nitelik, Doble, and MR are leaders in this area.

Online Partial Discharge (PD)

PD monitoring detects small electrical 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 (HFCTs) installed around the bushing ground connection, UHF antennas, or acoustic sensors mounted on the transformer tank to detect the signals generated by discharges. Analysis of PD patterns (Örneğin;, PRPD – Phase Resolved Partial Discharge) helps diagnose the type and severity of the defect. Nitelik (Iris Power), Doble, OMICRON, Altanova, and Power Diagnostix are key players.

Sıcaklık İzleme (Connections)

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. Infrared (IR) cameras (periodic or fixed) are commonly used. Fiber Optic Temperature Sensors (FOTS), like those from FJINNO, could also be applied to these connection points, offering immunity to the strong electric fields present near the bushing terminal.

Dissolved Gas Analysis (DGA) for OIP

For Oil-Impregnated Paper (OIP) bushings, analyzing the gases dissolved in the bushing’s insulating oil can provide diagnostic information, similar to main tank DGA. Fakat, dedicated online DGA monitors specifically for bushings are less common than main tank monitors but offered by some specialists like Qualitrol (Serveron).

Other Monitoring Methods

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

Sayfanın Üstü 10 Transformer Bushing Monitoring System Manufacturers

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 temperature monitoring.

Sıkça Sorulan Sorular (SSS)

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. Online monitoring provides continuous data under real operating conditions (gerilim, sıcaklık, load), 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 monitoring indicates that there is active degradation occurring within the insulation. While increasing PD levels or changes in PD patterns strongly suggest a growing risk of failure, predicting the exact time to failure is generally not possible. It serves as a critical warning to investigate and plan intervention.

How are sensors typically installed for online Capacitance/Power Factor monitoring?

Most modern high-voltage bushings have a voltage or test tap. Monitoring systems connect to this tap (often via a specialized adapter/sensor) Hedef measure leakage current relative to the system voltage. For bushings without taps, external sensors or antenna-based methods might be used, though potentially with less accuracy.

Is temperature monitoring important for the bushing’s internal insulation health?

Temperature itself is not the primary indicator of internal insulation degradation; Capacitance/Power Factor and PD are more direct measures. Fakat, 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.

Conclusion and Recommendation

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.

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

Disclaimer: This guide provides general information based on publicly available data and search results as of April 2025. Technologies, market positions, and company offerings can change. The primary methods for assessing internal bushing health are typically Capacitance/Power Factor and Partial Discharge monitoring. Temperature monitoring 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.

 

Fiber optik sıcaklık sensörü, Akıllı izleme sistemi, Çin'de dağıtılmış fiber optik üreticisi