.png)
Product — Triple frequency & multiple frequency test device — Triple frequency test device
Product name：Triple frequency test device
Executive standard：GB311-4，DL/T848.4
Other name：Triple frequency voltage generator, triple frequency induction withstand voltage test device
Component：The triple frequency generator body, control part < br > and power frequency test equipment can complete the primary induction withstand voltage test of transformer
| Purpose & brief description |
| ● It is mainly used for induction withstand voltage test of voltage transformer, transformer and other test objects. ● The triple frequency SBF adopts a three core five column structure. The working magnetic flux density of the iron core is selected above the saturated magnetic density, so that the vector sum of the fundamental potential (positive sequence vector) in the secondary winding with the opening connected into a triangle is 0, and the 150Hz third harmonic (zero sequence) in phase shall be generated at both ends of the opening. ● The primary side of three single-phase transformers is connected into a star, and the secondary side is connected into an open triangle. When a symmetrical three-phase sine wave power supply is added to the primary side, the voltage is increased to saturate the core magnetic circuit, so that the third harmonic component contained in the magnetic flux in the iron core is increased, and the third harmonic voltage induced on the iron core coil is also increased. ● The 150Hz (tripled frequency) induced voltage output from the secondary side of the generator of the open triangle is used as the tripled frequency test power supply voltage. ● When the triple frequency generator is loaded, its current changes from inductive to capacitive. Due to the influence of low power factor, the efficiency of the generator is low, generally only about 20%. Therefore, a reactor can be connected to an air winding of the tested object for current compensation to improve the power factor of the whole test circuit, ● Application: power product manufacturing companies, power operation departments, scientific research institutions and colleges and universities. ● Application products: high voltage products such as voltage transformer and power transformer |
| Test purpose |
| ● Conduct induced voltage withstand test for longitudinal insulation of transformer and voltage transformer. ● According to the national test standard, the induction test voltage of power transformer and voltage transformer is approximately 2-3 times the maximum working phase voltage. As we all know, the iron core of the transformer is nearly saturated under the rated frequency and rated voltage. If the test voltage greater than the rated voltage is applied at both ends of the winding of the tested transformer with power frequency power supply, the no-load excitation current will increase sharply to an impermissible degree. It can be seen from the relationship of induced potential that in order to apply the test voltage greater than the rated voltage, Without saturating the iron core, the method of increasing the power frequency can be adopted, and a power generator greater than frequency doubling must be used |
| Technical parameter |
| ● Input power supply: three-phase four wire, voltage 380 V, frequency 50 Hz ● Triple frequency output frequency: 150 Hz ● Triple frequency output voltage: 0 – 400V or 0 – 800V (plus step-up transformer) continuously adjustable ● Triple frequency output power: 5KVA – 150 KVA ● Triple frequency waveform distortion output voltage: no more than 3% ● Triple frequency continuous operation time at rated capacity: half an hour, and the average coil temperature rise shall not be greater than 65 K ● Measurement accuracy: Voltage 1%, current 2% ● Local discharge: less than 3pc ● Load characteristics: resistive, inductive and capacitive. |
| Technical features |
| This set of equipment can be used alone or combined with power frequency test device: ● When used alone, input the voltage to the secondary side of the transformer or transformer, and conduct induced voltage withstand test on the tested object. ● It can also be combined with power frequency inspection device ● Combined with power frequency inspection device is a method widely used by Wuhan High Tech Research Institute and various transformer manufacturers. Power frequency and triple frequency are respectively pressurized from the low-voltage side of the transformer through the switching of the console, so that the high voltage induced from the high-voltage side is directly added to the primary side of the transformer. Power frequency and triple frequency can be switched freely, and a set of equipment can be used for two purposes. ● Compared with the previous triple frequency test of voltage transformer, the number and floor space of equipment are reduced and the cost is saved. ● Simplify the test wiring mode, reduce labor and improve work efficiency. |
Feidian electric energy provides more professional testing equipment and technical services for power transformer, transformer, switch, high-voltage cable, power capacitor, bushing, insulator, lightning arrester, motor and other manufacturers
MORE QR code
Focus on us
Contact
Shanghai Feidian Electric Co.,Ltd
Address：Lingang section of Shanghai Pilot Free Trade Zone
Tel：13761804576
Email：zhangzaihui@126.com
Web site：www.feidian.net.cn
COPYRIGHT © 2021 Shanghai Feidian Electric Co.,Ltd ALL RIGHTS RESERVED
.png)
PREV 
