The voltage of the high-voltage vacuum circuit breaker is high, the short-circuit breaking current is large, the DC component decay time constant is 120ms, and the breaking is difficult. It is necessary to establish a test circuit equivalent to the actual breaking condition, which puts higher requirements on the breaking test and needs to be carried out. Insulation, short-circuit breaking and test technology research. In-depth research on the insulation performance, breaking capacity and test technology of the circuit breaker has been carried out in China, and an ultra-high voltage circuit breaker with double-break/four-break and 63kA breaking capacity has been developed.
The UHV circuit breaker uses a high-power hydraulic operating mechanism, which places high demands on operational characteristics and stability. On the basis of the hydraulic mechanism of the UHV circuit breaker with a breaking capacity of 50kA, according to the modular design, the output power of the mechanism is increased, and the high-flow quick-acting valve, the integrated multi-stage buffer system, and the sealing structure in the form of grid ring and seal are used. By optimizing various structural parameters, excellent mechanical properties are obtained, and the operating speed is adjustable.
The short-circuit breaking test of the UHV circuit breaker in China adopts the current introduction synthesis test method. The test current is appropriately adjusted to introduce the current and frequency of the voltage source to meet the requirements of the zero zone assessment equivalence.
Piezoelectric Elements For Inkjet Piezo Transducer
Piezoelectric ceramic ring
Applications: ultrasonic vibration tranducer for inkjet printer
Vibration mechanism of inkjet printer:
Generally, it is composed of piezoelectric ceramics and driving rods. By high-frequency electric excitation, piezo ceramics produce high-frequency ultrasonic vibration (above 60 kHz or higher), which is transmitted to the driving rod and generates high-frequency micro-displacement (back and forth expansion) at its front end.
Piezo ceramics components features :
1. High vibration amplitude and can withstand higher power.
2. The product has high reliability, strong maintainability, and is not easy to break down or off-line.
3. The frequency can be adjusted in a wide range, generally within the range of 10KHz.
Yuhai support all the new developping transducer, Welcome the customized elements inquiry.
The present piezoelectric elements for Inkjet piezo transducer is following :
Piezo rings OD4*ID2*2.5mm price USD1.20/pc, 2000pcs
Material: PBaS-4
Fr.: 694 KHz ±5KHz
K33: ≥0.55
Tg loss <0.5%
Ct 60pF ±12.5%
Piezo rings OD4*ID2*2.5mm price USD1.20/pc, 2000pcs
Material: PSnN-5
Fr.: 626KHz ±5KHz
K33: ≥0.57
Tg loss < 2%
Ct 53pF ±12.5%
Piezo rings OD6*ID2.5*2mm price USD1.50/pc, 2000pcs
Material: PZT-41
Fr.: 785 KHz ±5KHz
K33: >0.53
Tg loss < 0.5%
Ct 107 pF ±12.5%
Piezo rod OD3*7mm price USD1.20/pc, 2000pcs
Material: PLiS-51
Fr.: 192 KHz ± 3KHz
K33: >0.62
Tg loss < 2%
Ct 18.7 pF ±12.5%
Inkjet Piezo Transducer,Piezoelectric Vibration Transducer,Piezoelectric Rings,Piezoelectric Elements For Inkjet Piezo Transducer
Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com