1. Introduction
Safe operation and working life of power transformers depends largely on the safety and reliability of transformer winding. If the temperature of transformer winding exceed the temperature which insulation withstand, it will damage the insulation. This is one of the most important reasons that transformers cannot operate normally.
LD-B10 series temperature controller of dry transformer (Referred to as temperature controller) is an intelligent controller designed especially for safe operation of dry transformer. The temperature controller features adoption of single chip computer technology and utilization of the platinum thermo-resistors embedded in the winding of the dry transformer for detection and display of temperature rise of the transformer windings. It can start or stop the cooling fan automatically for forced air cooling of windings and control over-temperature alarm and over-temperature tripping output so that the transformer will be operated safely.
2. Technical Indicators
2.1 Range of measurement: -30.0℃～240.0℃
2.2 Accuracy of measurement: Grade of accuracy: Grade 1(Grade 0.5 for temperature controller, Grade B for sensor)
Resolution 0.1℃
2.3 Operating conditions: Room temperature: -20℃～55℃
Relative humidity: < 95% (25℃)
Power frequency: 50Hz or 60Hz (±2Hz)
Power voltage: AC220V (+10%, -15%)
Or AC380V (3-phase 3-wire system) (+10%, -15%)
(Power voltage should be indicated before placing order, otherwise AC220V shall govern)
2.4 Power consumption of temperature controller: ≤8W
2.5 Execution standard: Production standard: JB/T7631-2016 Electronic Thermo-controllers for Transformers
Certification passed: ISO9001:2015 Quality Management Systems-requirements
Test passed: IEC61000-4:2002 International Standard and GB/T17626-2008 Standard for Electromagnetic Compatibility Test and Measuring Technology
2.6 Relay contact output:
Capacity of contact of fan: 6A/250VAC (Cosφ=0.4) (Single-phase fan)
9A/380VAC (Cosφ=0.4) (Three-phase fan)
Control of output capacity: 5A/250VAC; 5A/30VDC (Resistance)
2.7 Protection class: IP40
Protection class of panel: IP54
3.Model Example
LD-BK10-220FQ
LD-BK10-220FCQ
LD-BK10-220FLQ
LD-BK10-220FLCQ
LD-BK10-220FGQ
LD-BK10-220FGLCQ
LD-BK10-220EFQ
LD-BK10-220EFIQ
LD-BK10-220EFGQ
LD-BK10-220EFCQ
LD-BK10-220EFICQ
LD-BK10-220EFGLCQ
LD-BK10-220EFLQ
LD-BK10-220EFILQ
LD-BK10-220EILCQ
LD-BK10-220EFGIQ
LD-BK10-220EFGICQ
LD-BK10-220EFGILCQ
LD-BK10-220FA
LD-BK10-220FCA
LD-BK10-220FLA
LD-BK10-220FLCA
LD-BK10-220FGA
LD-BK10-220FGLCA
LD-BK10-220EFA
LD-BK10-220EFIA
LD-BK10-220EFGA
LD-BK10-220EFCA
LD-BK10-220EFICA
LD-BK10-220EFGLCA
LD-BK10-220EFLA
LD-BK10-220EFILA
LD-BK10-220EILCA
LD-BK10-220EFGIA
LD-BK10-220EFGICA
LD-BK10-220EFGILCA
The above models are some examples. If there are special requirements. Explain before ordering.
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