Fracture And Phase Sequence Display Informer: Traditional Chinese Circ
In short: Traditional Chinese Practical Fracture. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 6373 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Phase failure and phase sequence indicatorIf the three-phase power supply fails or the phase sequence is reversed, it will cause harm to production if it cannot be discovered in time. It ranges from the motor not working properly or being unable to work, to the severe case of burning the motor or damaging the production equipment. Such accidents often occur in production and must be taken seriously and eliminated.At present, there are many ways to monitor and protect electric equipment damaged by three-phase power supply phase failure or phase sequence connection, but they are all complicated and people are unwilling to install them. The three-phase power supply phase failure and phase sequence display notifier introduced here has the advantages of fewer components, stable and reliable operation, and minimal power consumption. It can also emit light display and audible alarms at the same time. Even when the three-phase power supply voltage fluctuates greatly, the display informer can work normally.1． How the circuit worksThe three-phase power supply phase failure indicator circuit is shown in Figure 34-1.Figure 34-1When one phase of the three-phase power supply is disconnected, since the load of the motor remains unchanged, the current of the other two phases will inevitably increase, and the voltage between the artificial midpoint O and the ground is no longer zero. When the three-phase power supply is normal, the voltage between the artificial midpoint O and the ground is zero. According to this principle, when any of the three phases A, B, and C is missing (broken), the voltage between the artificial midpoint O and the ground is half of the three-phase line voltage, which will cause the neon bubble ZD to ignite, the piezoelectric buzzer will sound, and a phase-off audible and visual alarm will be issued; when the three phases A, B, and C are normal, the voltage between the artificial midpoint O and the ground is zero, the neon bubble DZ cannot ignite, and the piezoelectric buzzer will be silent.Figure 34-1 is suitable for three-phase 380V50Hz power supply circuit. …
Sign in to unlock
One-time payment per article, billed in credits (1 $ = 100 credits). You will review the invoice and the non-refundable digital-asset policy before anything is charged. The PDF is generated on demand and embeds a licensing watermark.
Unlock this article
One-time payment · permanent access after unlock · 1 $ = 100 credits
Member level pricing for this article
| Level | Cumulative top-up | Discount | Your price | You save |
|---|---|---|---|---|
| Free | Free | — | 10,560 credits | — |
| Bronze | $100.00+ | 2% off | 10,349 credits | 211 credits |
| Silver | $1,000.00+ | 5% off | 10,032 credits | 528 credits |
| Gold | $5,000.00+ | 10% off | 9,504 credits | 1,056 credits |
| VIP | $20,000.00+ | 15% off | 8,976 credits | 1,584 credits |
Prices are billed in credits (1 $ = 100 credits). Your level upgrades automatically as your cumulative top-up grows. Top up to unlock a higher discount ›
All articles are digital assets. Once a PDF is downloaded, the purchase is final and non-refundable.
Please log in to unlock this article.
Payment Methods
pay@viprole.com
Lei Cheng
pay@viprole.com
Lei Cheng