전자 부품 공급업체 | 트랜스포머, 인덕터, 인버터
1.Why oil immersed transformer faults cannot be ignored
Once an internal fault occurs in an 기름에 잠긴 변압기, 큰 손실을 입는 경우가 많습니다, 긴 수리 주기, and even causes power grid accidents.
그러므로, understanding the fault mechanism and configuring the protection system reasonably is a key issue in power engineering.
2.Analysis of common types of internal faults
2.1 부분방전
Initial manifestation of insulation defects
Strong concealment
Sustainable for months or even years
It is the most easily overlooked but dangerous form of malfunction.
2.2 Overheating of windings
Common reasons include:
- Long term overload
- poor contact
- Blocked heat dissipation
2.3 Interturn short circuit
mechanical stress
thermal aging
Insulation breakdown
2.4 Severe internal short circuit
Extremely destructive
May cause deformation or even explosion of the fuel tank
3.The core role of insulating oil in fault diagnosis
3.1 Gas Analysis (DGA)
By analyzing the dissolved gases in the oil, it can be determined that:
- Fault Type
- Fault development stage
3.2 Oil deterioration
Increase in moisture content
Decrease in dielectric strength
Acid value increases
4.Main protection device system for 기름에 잠긴 변압기
| Protection Device | 기능 |
|---|---|
| 가스 릴레이 (부흐홀츠 릴레이) | Early internal fault detection |
| Differential Protection | Primary protection |
| Temperature Controller | Overheating protection |
| 압력 릴리프 밸브 | Explosion prevention |
| 오일 레벨 표시기 | Operational monitoring |
5.Engineering case analysis
Case: Ignoring gas relay alarm
Alarm has occurred but has not been processed
Continuous development of internal discharge
Final inter turn short circuit
The direct economic losses have expanded several times
6.Typical Misconceptions in Operations and Maintenance
Only focus on tripping and do not attach importance to alarms
Ignore regular oil sample testing
Operating without capacity reduction in high temperature environment
The protective device is not regularly calibrated
7.New trend: Intelligent oil immersed transformer
온라인 DGA
Digital temperature monitoring
Intelligent casing
Remote state assessment
Oil immersed transformers are not “prone to failure”, but require proper understanding and maintenance.
A scientific protection system and professional operation and maintenance strategy are the key to ensuring its long-term stable operation.
