Products Description
Our transformer bushing monitoring system collects leakage current and bus-voltage phase information to calculate dielectric loss and capacitance trends. The system also evaluates selected voltage harmonics and discharge activity.
Technical Principle
The system acquires the bushing leakage-current signal through the test tap and synchronizes it with the reference voltage. Phase and amplitude calculations are used to obtain equivalent capacitance and dielectric-loss factor. Long-term trend comparison helps identify insulation deterioration while the transformer remains energized.
Product Features
The transformer bushing monitoring system combines bushing leakage-current and bus-voltage data for phase-aware assessment. Dynamic phasor processing supports dielectric-loss and capacitance trend analysis. Distributed acquisition reduces long analog signal paths at the transformer yard. Live-installation capability supports retrofit projects where the approved scheme permits it.
Operating Conditions
The product shall be installed and operated within the ratings stated in the technical parameters. Key site requirements include: frequency range. Keep the installation area clean, adequately ventilated, free from corrosive gas and severe vibration, and provide the specified grounding, clearance, and power quality.
Product Parameters
|
Parameter |
Details |
|
Applicable voltage class |
110 kV and above |
|
Phase configuration |
One monitoring device per A/B/C bushing group |
|
Monitored electrical values |
Leakage current, dielectric loss, and capacitance |
|
Bus-voltage harmonics |
3rd, 5th, 7th, and 9th |
|
Minimum discharge amplitude |
20 mV under on-site conditions |
|
Discharge frequency range |
200 kHz-300 MHz |
|
Pulse time resolution |
10 μs |
|
Phase resolution |
0.18° |
|
Installation method |
Live installation supported |
Product Advantages
- The transformer bushing monitoring system combines bushing leakage-current and bus-voltage data for phase-aware assessment.
- Dynamic phasor processing supports dielectric-loss and capacitance trend analysis.
- Distributed acquisition reduces long analog signal paths at the transformer yard.
- Live-installation capability supports retrofit projects where the approved scheme permits it.
Main Applications
The transformer bushing monitoring system is used for capacitive bushings on large transformers and reactors at 110 kV and above.
It serves utility substations, generation plants, and critical industrial power systems.
The data supports condition assessment, alarm management, and maintenance decisions.
Components
|
Part |
Function |
|
Bushing sensors |
Acquire leakage-current signals from each monitored phase. |
|
Bus-voltage sensing unit |
Provides the voltage phase and harmonic reference. |
|
Monitoring host |
Calculates dielectric-loss, capacitance, and discharge indicators. |
|
Communication module |
Transfers alarms, values, and trends to the station platform. |
FAQ
Q: What information is needed for model selection?
A: Provide transformer voltage class, bushing type, test-tap details, phase arrangement, and station communication requirements.
Q: What should be checked before installation?
A: Check the approved live-installation method, sensor grounding, cable shielding, and bus-voltage reference wiring.
Q: How can the device or system be integrated?
A: The monitoring host sends calculated values and alarms to the station platform through the selected interface.
Q: Which options should be confirmed before production?
A: Confirm phase quantity, host format, voltage-reference method, communication protocol, and cabinet location.
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