Transformer winding deformation test instrument based on the measurement of the characteristic parameters of transformer internal winding the internal fault frequency response analysis (FRA) method which is being developed in developed countries is adopted to make an accurate judgment of transformer internal fault.
After the design and manufacture of transformer is completed the line coil and internal structure are determined. Therefore for a multi-winding transformer line coil if the voltage grade is the same and the winding method is the same the corresponding parameters (Ci Li) of each line coil should be determined. Therefore the frequency domain characteristic response of each line coil is determined accordingly and the frequency spectrum of the corresponding three-phase line coil is comparable to some extent.
The distribution parameters of transformer windings will change when short-circuit between turns and phases occurs in the test process or collision occurs in the transportation process resulting in the relative displacement of the line coil and the deformation of the line coil caused by electromagnetic tension in the short-circuit and fault state during the operation process. Then it influences and changes the original frequency domain characteristics of the transformer that is amplitude change of frequency response and resonance frequency offset. The transformer winding test instrument developed according to the response analysis method is such a novel non-destructive testing equipment for transformer internal faults. It is suitable for the internal structure fault detection of 63kV ~ 500kV power transformer.
Transformer winding deformation test instrument based on the measurement of the characteristic parameters of transformer internal winding the internal fault frequency response analysis (FRA) method which is being developed in developed countries is adopted to make an accurate judgment of transformer internal fault. After the design and manufacture of transformer is completed the line coil and internal structure are determined. Therefore for a multi-winding transformer line coil if the voltage grade is the same and the winding method is the same the corresponding parameters (Ci Li) of each line coil should be determined. Therefore the frequency domain characteristic response of each line coil is determined accordingly and the frequency spectrum of the corresponding three-phase line coil is comparable to some extent. The distribution parameters of transformer windings will change when short-circuit between turns and phases occurs in the test process or collision occurs in the transportation process resulting in the relative displacement of the line coil and the deformation of the line coil caused by electromagnetic tension in the short-circuit and fault state during the operation process. Then it influences and changes the original frequency domain characteristics of the transformer that is amplitude change of frequency response and resonance frequency offset. The transformer winding test instrument developed according to the response analysis method is such a novel non-destructive testing equipment for transformer internal faults. It is suitable for the internal structure fault detection of 63kV ~ 500kV power transformer. product names Electric power transformer winding deformation test instrument Transformer winding deformation detector Transformer winding deformation meterTransformer winding deformation analyzer
IP65 explosion-proof and waterproof Zone 2 inverter is the most advanced DC to AC inverter, built in low frequency isolation transformer, IP65 industrial explosion proof rating enclosure, widely used in coal mines, wineries, chemical plants. Application: 1. Zone 1& 2 Hazardous locations, such as: underground coal mines, wineries, chemical plants, etc. 2. Environment with IIA, A A IIB, IIC types of explosive gas, such as: Flour mills, Aluminum powder plant, Metal mine factory, Graphite factory.etc. 3. Indoor (IP54) or outdoor(IP65) 4. Low noise/ Silent working mode 5. Explosion proof/ Spark-proof/ Waterproof/ Anti-dust/ Shock-proof. Features: 1. Durable: 4.0 thick steel plate seamless welding, surface spray, beautiful appearance. 2. Explosion proof rating: Explosion-proof standard is EXdIIBT4. 3. More reliable: Built-in low frequency isolation transformer, strong ability of anti-interference. 4. Widespread application: DC to AC, Single phase to Three phase, High voltage to Low voltage or Low voltage to High voltage. 5. Pure sine wave output, quick instant response speed 6. Excellent performance of taking load, it can take a variety of loads, such as: halide lamps, motors, welding machines, precision machine tools, fluorescent lamps, energy-saving lamps, etc. 7. Powerful protection functions: With over-current, over load, under voltage, over voltage, short circuit, over heating and other protection. 8. High protection class: With good performance of anti-dust, waterproof,shockproof. 9. 100% full power output: Can be 7* 24 hours continuously working 10. Accept customized: Can be customized according to customers' requirements. 11. Adopted the sixth generation IPM intelligent power module from Mitsubishi,high efficiency and stable performance, intelligentized, modular, simple structure design, very easy and low cost for future's maintenance. 12. Advanced functions: 1) Setting flexible: The DC input voltage range, output voltage, output frequency all can be set. 2) Two kinds of work mode: Can add AC bypass input(Optional), Battery priority, AC bypass as back up or AC bypass priority, battery as back up. 3) Two kinds of start mode: Variable frequency start and Step down voltage start. with stronger capacity to drive inductive load. 4) RS485 remote monitoring(Optional) 5) Big LCD color screen display, modular structure very easy for future's maintenance 6) High efficiency > 94% and low loss, design service life > 15 years.
40Kw Off Grid Inverter With CSA/UL Approved Our SDP series Off Grid Pure sine wave inverter is one of the most advanced DC to AC conversion products in the world, it is suitable use for areas without electricity, vehicles, ships, solar energy, wind turbine and other renewable energy systems and etc, can supply power and provide guarantee effectively for the areas with traffic inconveniences, in the mountains, pastoral, border, island and other areas without electricity. It has the main advantages of high quality sine wave AC output, microcomputer control, humanness design, and it is high efficiency and low no-load loss, and no pollution. The inverter can also supply AC power to all kinds of electric equipment, air conditioners, motors, refrigerators, lights, TV, electric fans and other industrial power supply. 1. Using the sixth generation efficient IPM intelligent module from Japanese Mitsubishi, high efficiency and stable performance. It with powerful protection function, the protection for short circuit, over load, over temperature is more safe and reliable. Itâ??s service life can up to 15 years or more. 2. Intelligentized, modularized, simple structure design with powerful function. 3. Two kinds of start mode: Step-down Voltage Start and Variable Frequency Start. Customers can set start mode according to the type of their load. This function is very convenient for users and also reduce frequency converterâ??s usage, which reduced the cost of equipment investment, easy to connect wires and control. 4. The output frequency can be setting via LCD panel, itâ??s very convenient for customer. 5. The output voltage can be set between -40 % to +20 % of rated voltage. And the output voltage is very accuracy �±1%. 6. The DC input voltage range can be set. Over-voltage point, under-voltage point, over-voltage recovery point, under-voltage recovery point all can be setting via the LCD panel. 7. Pure sine wave output. With good dynamic response less than 50MS, waveform distortion rate smaller, higher conversion efficiency and stable output voltage. 8. Low Frequency Transformer, which ensures that inverter has high efficiency. 9. High conversion efficiency, Max. Efficiency 94%,if 48VDC input, the efficiency can more than 85%. 10. Adopts black pure aluminum radiator, which confirms the best radiating performance. 11. Powerful data display function. LCD can display the DC input voltage, output frequency, phase voltage, phase current, AC bypass input voltage, output power KWH, time and date, temperature, fault code display. 12. Wide input voltage can be set according to customer's requirement. Input voltage range can be selected from 150-400V or 300-600V or 400-800V. 13. Wide input voltage can work without battery and solar charge controller, save more cost and With MPPT wide voltage input function, maximum use of solar power.
SANDI 30KW DC to AC inverter with 120/240V split-phase off grid inverter with CSA/UL1741 Our SDP series Off Grid Pure sine wave inverter is one of the most advanced DC to AC conversion products in the world, it is suitable use for areas without electricity, vehicles, ships, solar energy, wind turbine and other renewable energy systems and etc, can supply power and provide guarantee effectively for the areas with traffic inconveniences, in the mountains, pastoral, border, island and other areas without electricity. It has the main advantages of high quality sine wave AC output, microcomputer control, humanness design, and it is high efficiency and low no-load loss, and no pollution. The inverter can also supply AC power to all kinds of electric equipment, air conditioners, motors, refrigerators, lights, TV, electric fans and other industrial power supply. Technical Features: 1. Using the sixth generation efficient IPM intelligent module from Japanese Mitsubishi, high efficiency and stable performance. It with powerful protection function, the protection for short circuit, over load, over temperature is more safe and reliable. Itâ??s service life can up to 15 years or more. 2. Intelligentized, modularized, simple structure design with powerful function. 3. Two kinds of start mode: Step-down Voltage Start and Variable Frequency Start. Customers can set start mode according to the type of their load. This function is very convenient for users and also reduce frequency converterâ??s usage, which reduced the cost of equipment investment, easy to connect wires and control. 4. The output frequency can be setting via LCD panel, itâ??s very convenient for customer. 5. The output voltage can be set between -40 % to +20 % of rated voltage. And the output voltage is very accuracy �±1%. 6. The DC input voltage range can be set. Over-voltage point, under-voltage point, over-voltage recovery point, under-voltage recovery point all can be setting via the LCD panel. 7. Pure sine wave output. With good dynamic response less than 50MS, waveform distortion rate smaller, higher conversion efficiency and stable output voltage. 8. Low Frequency Transformer, which ensures that inverter has high efficiency. 9. High conversion efficiency, Max. Efficiencyâ?¥94%,if 48VDC input, the efficiency can more than 85%. 10. Adopts black pure aluminum radiator, which confirms the best radiating performance. 11. Powerful data display function. LCD can display the DC input voltage, output frequency, phase voltage, phase current, AC bypass input voltage, output power KWH, time and date, temperature, fault code display. 12. Wide input voltage can be set according to customerâ??s requirement. Input voltage range can be selected from 150-400V or 300-600V or 400-800V. 13. Wide input voltage can work without battery and solar charge controller, save more cost and With MPPT wide voltage input function, maximum use of solar power.
Our SDP series Off Grid Pure sine wave inverter is one of the most advanced DC to AC conversion products in the world, it is suitable use for areas without electricity, vehicles, ships, solar energy, wind turbine and other renewable energy systems and etc, can supply power and provide guarantee effectively for the areas with traffic inconveniences, in the mountains, pastoral, border, island and other areas without electricity. It has the main advantages of high quality sine wave AC output, microcomputer control, humanness design, and it is high efficiency and low no-load loss, and no pollution. The inverter can also supply AC power to all kinds of electric equipment, air conditioners, motors, refrigerators, lights, TV, electric fans and other industrial power supply. Technical Features: 1. Using the sixth generation efficient IPM intelligent module from Japanese Mitsubishi, high efficiency and stable performance. It with powerful protection function, the protection for short circuit, over load, over temperature is more safe and reliable. It's service life can up to 15 years or more. 2. Intelligentized, modularized, simple structure design with powerful function. 3. Two kinds of start mode: Step-down Voltage Start and Variable Frequency Start. Customers can set start mode according to the type of their load. This function is very convenient for users and also reduce frequency converter's usage, which reduced the cost of equipment investment, easy to connect wires and control. 4. The output frequency can be setting via LCD panel, it's very convenient for customer. 5. The output voltage can be set between -40 % to +20 % of rated voltage. And the output voltage is very accuracy ±1%. 6. The DC input voltage range can be set. Over-voltage point, under-voltage point, over-voltage recovery point, under-voltage recovery point all can be setting via the LCD panel. 7. Pure sine wave output. With good dynamic response less than 50MS, waveform distortion rate smaller, higher conversion efficiency and stable output voltage. 8. Low Frequency Transformer, which ensures that inverter has high efficiency. 9. High conversion efficiency, Max. Efficiency 94%,if 48VDC input, the efficiency can more than 85%. 10. Adopts black pure aluminum radiator, which confirms the best radiating performance. 11. Powerful data display function. LCD can display the DC input voltage, output frequency, phase voltage, phase current, AC bypass input voltage, output power KWH, time and date, temperature, fault code display. 12. Wide input voltage can be set according to customer's requirement. Input voltage range can be selected from 150-400V or 300-600V or 400-800V. 13. Wide input voltage can work without battery and solar charge controller, save more cost and With MPPT wide voltage input function, maximum use of solar power.
SMD fax modem telecom transformers SMD audio meets UL 1950 or EN60950 telecom transformer Frequency range: 20Hz to 20kHz audio telecom transformer Frequency response: í+3dB maximum Data rate: V.22 to V.90 matching telecom transformer Fax modem telecom transformers Toroidal civil AV audio power transformer Dependable professional audio telecom transformer Multimedia active audio telecom transformer Quiescent civil AV audio telecom transformer Congruent civil AV audio telecom transformer Adequate civil AV audio telecom transformer 2,400bps to 56.6Kbps (V.90) and PCMCIA applications Isolated telecom transformer Technical properties of 600:600 ohms telecom transformer Over 1,000 transformers for modem application Audio transformer used in telephone systems and PABX systems Designed to meet UL 1950 or EN60950 telecom transformer Compact sizes from EE-8 to EE-24 telecom transformer Other types of audio transformers made with RM, EP, EPC or others telecom transformer
PCUG - Series: Ultrasonic generator with digital current display and pulse sweep frequency adjustment for industrial cleaning and biodiesel production application. It can directly connect with our "PCUI" immersion transducers pack to form a power cleaning system OR biodiesel reactor to form biodiesel production system General Specification : Input: 120Vac / 220Vac, 50 / 60Hz Output Power: 600W, 900W, 1000, 1200W, 1500W, 1800W Output Frequency: 10KHz to 133KHz Pulse Sweep Frequency : 0 ~ 20Hz Feature : 1) Power Level Control 2) Pulse sweep frequency adjustment to improve cleaning effect. 3) Current Overload protection. 4) Thermal Overload protection. 5) Current indication. 6) Robust design and can be 24 hours continuously operation.
Synthesized Signal Generators TFG3630 TFG3630 synthesized signal generators with PLL technique and use the FPGA to control screen display and output, with excellent technical performances and powerful function which are necessary for the experimental detection circuit and device detection. Large color LCD interface can show a variety of working parameters. Keypads and knob are convenient for operation. China Digital Multimeters China Frequency Characteristic Analyzer China Frequency Counter Features Frequency resolution: 3Hz Unlimited measurement range: digital setting directly for the whole range. Non-intergraded process: up to the stable value immediately when switching, continuous signal phase and amplitude without deflection. Sweep characteristics: with the function of frequency sweep and power sweep. Start point and stop point can be set arbitrarily. Modulation characteristics: pulse modulation signal with user-defined can be output. Operation mode: key operation, TFT-LCD interface, direct digital setting, continuous adjustment by knob. High reliability: large scale integrated circuit, SMT, high reliability and long service life. Communication port: USB device , RS232 and GPIB (optional) Specifications Frequency Range 25MHz~3GHz Resolution 3Hz Accuracy ±5ppm Stability 1Ã?10-7 Reference Frequency Reference Output: Frequency: 10MHz Level: >0dBm Port: BNC connector Reference Input: Frequency: 10MHz Power: -3 ~+7dBm Input Port: BNC connector Impedance(nominal): 50Ω Phase Noise -90dBc~-115dBc Offset20 kHz Spurious Harmonic:
PCB type Ultrasonic cleaning generator can be used with ultrasonic transducers to make a perfect ultrasonic cleaning.It is more compact, economic and space save design to fit both light duty and heavy duty cleaning system. It is very durable and can be continuously used for mass production even 24 hours operation. The generator can provide a timing feature, power adjustment, and sweep frequency feature.
