Transformer Thermostat Manufacturer Selection Guide

I. Define the core requirements and application scenarios

1. Transformer Type Adaptation
   • Dry-type transformer: A thermostat that supports winding temperature monitoring (e.g., Pt100 sensor) and multi-level control of the fan (e.g., low/medium/high speed) needs to be selected.
   • Oil-immersed transformers: Oil level temperature monitoring, pump linkage control, and compatibility with gas relay signal inputs are required for some models.
2. Environmental and operational requirements
   • High temperature and high humidity environment: Select a product with a protection rating of IP54 or higher and a moisture-proof coating on the circuit board.
   • EMI scenario(Preference is given to models that have passed common mode interference and space RFI tests).
3. Function Prioritization
   • basic necessity: Temperature display, over-temperature alarm, fan start/stop.
   • advanced needs: RS485 communication (Modbus protocol), historical data storage, remote monitoring.

II. Technical standards and certification compliance

1. Industry Standard Matching
   • domestic standardIt should comply with JB/T 7631-2016 Electronic Temperature Controller for Transformer (Measurement Accuracy Level 1.0, Display Accuracy Level 0.5), or GB/T 1094.6-2011 Power Transformer Part 6: Reactor.
   • international standard: Export scenarios are required to meet certifications such as IEC 60730 (safety) and EN 55014 (EMC).
2. Key certification verification
   • quality certification: ISO 9001 (production management), ISO 14001 (environmental management).
   • environmental certification: EU RoHS (Restriction of 10 Hazardous Substances), China RoHS (need to be filed in the public service platform).
   • Explosion-proof certification: ATEX, IECEx certification for chemical and coal mining scenarios.

Third, the strength of manufacturers and product performance assessment

1. Production technology and R&D capabilities
   • core technology: Check to see if they have their own patents (e.g., Fuzhou Inno's fluorescent fiber optic sensor technology), or are cooperating with universities (e.g., Fuzhou University).
   • process level: Examine the placement and potting process to avoid resulting reliability problems.
2. Product Performance Indicators
   • Accuracy and Response: Measurement accuracy within ±1°C and fast response time.
   • anti-interference capability: Common-mode interference tolerance.
   • durability: Contact action life, high temperature aging test without drift.
3. Compatibility and Scalability
   • Sensor Compatibility: Supports mainstream sensors such as Pt100, NTC, etc., with lead resistance compensation.
   • system integration: Supports protocols for access to SCADA or energy management systems.

Fourth, market reputation and actual case verification

1. Industry Case Studies
   • Power industry: Prefer State Grid and South Grid suppliers (e.g. Fuzhou Inno), or have participated in large-scale projects (e.g. wind power, nuclear power).
   • nicheNew energy fields (e.g. photovoltaic inverters) need to select models that support a wide temperature range.
2. User Reviews and Feedback
   • failure rate: Verify that the product has a low three-year failure rate through industry or customer cases.
   • ServiceDomestic manufacturers usually provide a 24-hour response, while imported brands may take 1-2 weeks.

V. After-sales service and long-term costs

1. Warranty and Maintenance Policy
   • warranty period: At least 1 year.
   • Maintenance Response: Reduce downtime losses.
2. Total Life Cycle Costs
   • Initial cost: Domestic thermostats are less expensive than imported 30%-50% (e.g. Innotek).
   • maintenance cost: Select modular design to reduce replacement costs; remote diagnostic function can reduce the frequency of manual maintenance.

Six,Systematized decision-making process

1. 1. List of requirements: List key parameters such as temperature range, interface type, and protection class.
   2. preliminary screening: Exclude non-compliant manufacturers based on certifications, cases.
   3. Sample Testing: Commission a third-party testing organization to conduct life testing and temperature drift testing.
   4. field visit: Visit the production line to verify the key processes such as SMD and aging test.
   5. business negotiation: Compare warranty terms, training services, spare parts supply cycles.

VII. Comparison and recommendation of domestic and foreign brands

VIII. Key tools and resources

1. Authentication Inquiry::
2. Testing Organization::