1 Overview
The DC system in power plants and substations supplies power to the control and protection circuits under normal conditions. In the event of an accident, when the AC power supply is completely stopped, the power supply time of 1 to 2 hours must be guaranteed, and the voltage required to be supplied to the DC bus should not be lower than the rated voltage. 90% of the value. The spare capacity is provided by the battery pack, and the service life and effective capacity of the battery pack depend on the technical specifications of the charger (regulation accuracy, steady current accuracy, ripple factor). In the use of the charger for 10 to 20 years, the technical indicators will inevitably change. In severe cases, the charging capacity of the battery pack will be insufficient. When the substation is in power failure, the battery pack cannot be reliably supplied, resulting in total station protection. And the switch refuses to move, causing major accidents such as damage to the main equipment and collapse of the power grid.
At present, the technical indicators reached by the DC charging equipment operating in the power system are the data provided by the manufacturer during the factory test. It is difficult to confirm whether the technical indicators of the equipment meet the requirements because the on-site maintenance personnel do not have the corresponding testing methods. Moreover, as the running time goes on, the technical indicators of the equipment will shift. The typical consequence is that the regulator's index drops, the voltage regulation, steady current, and ripple factor exceed the standard, causing battery failure and directly threatening the safe operation of the power grid.
Therefore, it is necessary to develop a detection device using microcomputer control technology, and adjust the AC input voltage and output load of the device under test such as the charger according to the standard set value, and the detection device automatically performs sampling calculation to form A mobile automated inspection system for on-site comprehensive testing of DC power supply specifications.
Magnetic Transducer External Drive Type
The magnetic transducers (External Drive Type) are versatile and customizable to different physical sizes, housings, mounting options, power consumptions. Our magnetic transducers are engineered to be used with an external drive circuit. This allows our customers the flexibility to design and customize the circuitry to meet their needs. External circuitry allows different frequency ranges to be used to create multiple sounds through excitation waveform. Our magnetic transducers come in a slim-line profile and are a cost-effective solution. Our extensive capabilities make our magnetic transducers an excellent solution for high/low tones, siren, and chime sounds.
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