The AC power supply is introduced into the three-winding rectifier transformer through the main power supply air switch, AC filter, phase sequence protection relay and AC contactor. There are two three-phase windings on the secondary side of the transformer, which are connected in delta and star configurations respectively. Among the two three-phase windings, the phase difference between the in-phase windings is 30°, and the output line voltage of both is AC242V. The output of the six-phase transformer is connected to two sets of three-phase bridge thyristor rectifier modules. After rectification, it is output in series as DC650V, a 12-pulse DC voltage with an inherent pulsation coefficient of 1.4%. Then, it is filtered by the DC filter LC and connected to the DC output terminal block in two channels through the DC contactors BZ01 and BZC2. The two DC contactors can independently control any one of the outputs. Or output two channels simultaneously.
Key words：
Techicel Conditions
| Rated AC input | Three-phase three-wire system 380, 50Hz |
| Rated capacity | 20KW, rated output DC voltage 350-640V adjustable, rated output DC current 0-30A adjustable. |
| Transformer cooling | Dry self-cooling |
| SCR element cooling | Air cooling |
| Electromagnetic Compatibility (EMC) | The suppression quantity (EMI) of electromagnetic interference signals generated by the surrounding environment and the immunity sensitivity (EMS) of the equipment to electromagnetic interference existing in the surrounding environment are superior to the values of GJB151B-2013 by 6dB. |
FAQ
Here, common questions are answered and clarified
Voltage fluctuation fault
● Youdaoplaceholder6 Common causes:
- The external power supply is unstable or abnormal.
- There is a wiring error during the operation of the equipment.
- Environmental factors (such as temperature changes) cause voltage fluctuations.
● Solve the problem:
- Use a reliable power supply and avoid relying on external power sources.
- Check and adjust the connection method of the equipment.
- Reserve sufficient protection circuits or use step-down circuits to limit the impact of voltage fluctuations.
Short-circuit fault
● Youdaoplaceholder6 Common causes:
- Internal circuit short circuit (such as coil damage).
- External short circuit (such as short-circuiting of power pins).
● Solve the problem:
- Inspect the internal structure of the equipment, identify and repair the short-circuit points in the internal circuits.
- Use disconnected pins or external pins for protection and isolation.
- Reserve sufficient buffer layers or cooling systems to prevent the silicon wafers from overheating and getting damaged.
Current out-of-control (IQN) fault
● Youdaoplaceholder6 Common causes:
- The external current is too large, causing the silicon wafer to bear an excessively high current.
- During the operation of the o equipment, the load was too heavy, causing the silicon wafers to be overloaded.
● Solve the problem:
- Reserve sufficient safety current to ensure that the current during equipment operation does not exceed the designed maximum value of the silicon wafer.
- Use protection circuits or step-down circuits to limit the influence of external currents.
- Reserve sufficient buffer layers to prevent excessive current from damaging the silicon wafer.
Excessively high temperature fault
● Youdaoplaceholder6 Common causes:
- High-temperature environments cause silicon wafers to expand due to heat and get damaged.
- The cooling system failed to effectively cool the silicon wafers.
● Solve the problem:
- Reserve sufficient buffer layers or cooling systems to prevent the silicon wafers from overheating and getting damaged.
- Use a heat sink or coolant (such as water) to lower the temperature of the silicon wafer.
- Regularly inspect and maintain the cooling system of the equipment.
Overload fault
● Youdaoplaceholder6 Common causes:
- During the operation of the equipment, the load was too heavy, causing the silicon wafers to bear excessive current.
- If the external load exceeds the design maximum value of the silicon wafer, it may cause damage to the silicon wafer.
● Solve the problem:
- Reserve sufficient safety load to ensure that the load during equipment operation does not exceed the design maximum value of the silicon wafer.
- Use protection circuits or step-down circuits to limit the influence of external loads.
- Reserve sufficient buffer layers to prevent the silicon wafer from being damaged due to excessive load.
Summary of Solutions for Current Anomaly (IQN) Faults
● Test with a volt-ampere meter: Measure the output voltage and current to ensure they meet the design parameters of the silicon wafer.
● Apply phase difference test: Check the phase deviation of the silicon wafer to ensure its stability in AC signals.
● Dynamic calibration equipment: Dynamically adjust the equipment or external power supply according to the actual working environment (such as temperature changes).
Through regular Testing and Diagnosis processes, faults of thyristor equipment can be identified and resolved more accurately.
Certification
It has passed the ISO9001:2015 quality management system certification. In 2005, it was awarded the titles of "National Rectifier Product Quality Assurance and Honest Business Demonstration Unit" and "National AAA Quality Brand Enterprise" by the China Marketing Association. It has been rated as a "Contract-abiding and Creditworthy Enterprise" by the Wuhan Administration for Industry and Commerce for many years.
Project Case
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Factory
The total number of employees in the unit, including the situation, number and composition ratio of technical personnel at all levels, currently has over 60 employees, including more than 18 engineering and technical personnel. Among them, there are 4 senior engineers, 10 engineers, and 4 assistant engineers and technicians.
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As a designated manufacturer of rectifiers by the former Ministry of Machinery Industry, we specialize in the production of electrolytic and electrochemical rectifiers. We have numerous production achievements and rich manufacturing experience in the electrolytic copper industry.