Phase Failure Three Phase Voltage Relay Overvoltage CE / CCC Certification

Phase sequence protector principle

Phase Sequence Protector Principle Under normal circumstances, the wiring order of the motor work is regulated. If for some reason, the phase sequence is disordered, the motor will not work properly or even be damaged. Phase sequence protection is to prevent such accidents from happening.

Phase sequence protection can use phase sequence When the phase sequence in the circuit does not match the specified phase sequence, the phase sequence relay will trigger the action and cut off the control circuit so as to cut off the motor power supply and protect the motor.

Three-phase alternating current phase sequence detection circuit is composed of helium bubble NB. Due to the phase-shifting effect of C1, when the power supply is connected in the phase sequence of A, B, and C in the figure, the helium bubbles emit light, and when the reverse phase sequence is connected to A, C, and B, the helium bubbles are not bright.

When the start button QA is pressed, the alternating current is depressurized by C2, VD1, and rectified and DW to obtain a DC voltage of 12V, which is added to the protection execution circuit composed of the relay K and the photosensitive resistor tube V. If the order of the phases is A, B, and C, then the helium bubbles emit light, and the CDS packaged with the helium bubbles exhibits a very low impedance after being irradiated with light, and then V gets a biased base current and conducts. K picks up, K1 Connect the AC control circuit, C pulls in and the motor starts running. On the other hand, if the reverse phase sequence is followed, the bubble does not light, K does not pull, and K1 turns off, and the motor cannot be started. This achieves the purpose of protection.

Features

Phase sequence protection device can be divided into two types: contact phase sequence protector and non-contact phase sequence protector. The former uses electromagnetic relays or AC contactors as its actuators, while the latter uses solid-state relays (thyristors, IGBTs, high-voltage VMOS transistors) as its actuators. The former uses the contacts of an electromagnetic relay or AC contactor to break the phase-sequence faulty three-phase power supply, while the latter uses an electronic component to turn off the faulty power supply. Therefore, compared with the former, the latter has the characteristics of fast response, no noise, no spark, long life, small size, and high mechanical strength. The former is relatively the latter, has a high breakdown pressure, withstand overload, low cost, etc. Features.

Three-phase monitoring of phase sequence, phase loss, over- and undervoltage and phase unbalance

♦ Technical data

GINRI POWER AUTOMATION CO.,LTD. is a professional production voltage phase sequence protection device (and name: three-phase power monitor), and PLC output zoom Board, and smart type motor integrated protection device, and industrial parts manufacturers, technology development team in elevator industry, and refrigeration industry, and crane industry, environmental equipment, mechanical NC industry and the industrial following insurance industry, field has more than 10 years practice experience, has development out variety price economic and function excellent of products. CQC product quality system by China Quality Centre (3C) certification and CE certification, products in the manufacturing process in strict accordance with the ISO9001 quality assurance system requirements and professional technical and service support.

Voltage phase-sequence protection for many years (equipment, refrigeration equipment, crane (passenger and goods) elevators, control of DC power supply system (Cabinet) screens, precision air conditioners, room air conditioners, electric hoist, boiler equipment, laser equipment, parking equipment, cranes, compressors) and so on using the run.

PLC output amplifiers (environmental protection equipment, numerical control and automation equipment, automobile, plastic machinery, hydraulic machinery, ceramic foam machinery, woodworking machinery, machinery) and so on using the run.

Years of integrated Intelligent motor protector (power plants, paper mills, steel mills, aluminium plants, cement plants, sewage treatment plants, coal preparation plants, refineries, petrochemical plants), and so on using the run.

Product quality is stable and safe, reliable, and earned a solid market position in the market and a high reputation in the industry, received unanimous recognition and praise of our customers.

Ginri company always adhere to "scientific management as the core, the user needs for the Centre to focus on product quality, meticulous service is sincere," the spirit of enterprise, please call us from all walks of life, thank you!