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Product — Dielectric loss test equipment — Automatic dielectric loss tester
Product name：Automatic dielectric loss tester
Executive standard：GB1409-88、DL/T962-2005
Other name：Dielectric loss tester, dielectric loss tester
Component：Host of automatic dielectric loss tester; Standard capacitor is required for external connection method
Note: there are two specifications of dielectric loss bridge：
● High precision high voltage capacitor bridge: external test power supply and standard capacity are required
● Automatic dielectric loss tester: internal 10kV boost power supply
| Purpose & brief description |
| ● It is mainly used to measure the dielectric loss (TG) of various insulating oils and insulating materials δ） And dielectric constant（ ε）。 ● Dielectric loss refers to the internal energy loss of insulating materials due to the hysteresis effect of dielectric conductivity and dielectric polarization under the action of electric field. Also called dielectric loss, referred to as dielectric loss. ● Dielectric loss factor refers to the parameter to measure the degree of dielectric loss. ● Application: power product manufacturing companies, power operation departments, scientific research institutions and colleges and universities. ● Application products: various insulating parts, medium voltage switchgear, GIS high voltage switch, cable and cable accessories, transformer, power transformer, high voltage circuit breaker, capacitor bushing, motor, lightning arrester, other high voltage electrical components and insulating materials |
| Test purpose |
| ● The purpose of dielectric loss test is to judge the insulation performance of equipment by measuring dielectric loss factor. ● Measuring dielectric loss factor is an indispensable item in preventive test. Because the dielectric loss factor of electrical equipment is too large, many energy will be lost in the form of heat under the action of AC voltage. The generated heat will increase the insulation temperature of electrical equipment, aging the insulation, and even cause insulation thermal breakdown. ● The decrease of insulation capacity is directly reflected by the increase of dielectric loss factor. Further, the causes of insulation decline can be analyzed, such as insulation moisture, insulation oil pollution, aging and deterioration, etc. ● Therefore, dielectric loss test shall be conducted during delivery test, and such test shall also be conducted for electrical equipment in operation. While measuring the dielectric loss, the capacitance of the test object can also be obtained. The obvious change of capacitance reflects the short circuit and open circuit of one or several capacitors. |
| Technical parameter |
| ● Accuracy: Cx：± (reading) × 1%+1pF） Tg δ：± (reading) × 1%+0.00040） ● Anti interference index: frequency conversion anti-interference, which can still achieve the above accuracy under 200% interference ● Capacitance range: high voltage applied: 3pF~60000pF/10kV 60pF~1.2 μ F/0.5kV Externally applied high voltage: 3pF~1.5 μ F/10kV 60pF~30 μ F/0.5kV Resolving power: Up to 0.001pf, 4 significant digits Tg δ Range: Unlimited, resolution 0.001%, automatic identification of capacitance, inductance and resistance. Test current range: 10 μ A~5A ● Internally applied high voltage: set voltage range: 0.5~10kV Maximum output current: 200mA Pressure rise and fall mode: Continuous smooth adjustment Voltage accuracy: ±(1.5% × Reading + 10V) Voltage resolution: 1V ● Test frequency: 45 ~ 65Hz integer frequency 49 / 51hz, 45 / 55Hz automatic double frequency conversion Frequency accuracy: ± 0.01Hz ● Externally applied high voltage: maximum test current 5A / 40 ~ 70Hz during positive wiring Maximum test current during reverse wiring 10kV / 5A / 40 ~ 70Hz CVT self excitation low voltage output: output voltage 3 ~ 50V, output current 3 ~ 30A ● Measurement time: About 30s, related to the measurement method |
| Technical features |
| ● Frequency conversion and anti-interference Using frequency conversion anti-interference technology, it can still measure accurately under 200% interference, and the test data is stable. It is suitable for anti-interference dielectric loss test on site. ● High precision measurement Frequency floating, digital waveform analysis, bridge self calibration and other technologies are adopted to cooperate with high-precision three terminal standard capacitor to realize high-precision dielectric loss measurement, and the accuracy and stability of forward / reverse wiring measurement are consistent. The input resistance of all measuring ranges of the instrument is lower than 2 Ω, eliminating the influence of additional capacitance of the test line. The external oil cup can be used for precision insulating oil dielectric loss test, and the external solid material measuring electrode can be used for precision insulating material dielectric loss test. ● Good compatibility Automatically identify 50Hz / 60Hz system power supply and support generator power supply. It can be measured normally even if the frequency fluctuation is large. The built-in series and parallel dielectric loss measurement models are fully compatible with the calibration bench and dielectric loss standard, which is convenient for instrument verification. ● Multi level safety protection to ensure personal and equipment safety High voltage protection: short circuit, breakdown or high voltage current fluctuation of the test object can cut off the output at high speed in the form of short circuit. Low voltage protection: if 380V is wrongly connected, power fluctuation or sudden power failure, the protection will not cause overvoltage. Grounding protection: start the grounding protection when the enclosure is under dangerous voltage due to poor grounding of the instrument. C V T: four protection limits of high voltage and current and low voltage and current, which will not damage the equipment; The misselected menu will not output the excitation voltage. There is no 10kV High voltage output during CVT measurement. Anti misoperation: two-stage power switch; Real time monitoring of voltage and current; Press the key for multiple times to confirm; High / low voltage wiring terminal; Slow speed boost, rapid pressure reduction and audible and visual alarm. Anti "capacity rise": the "capacity rise" effect of voltage rise will appear when measuring high-capacity test objects. The instrument can automatically track the output voltage and keep the test voltage constant. Seismic performance: the instrument adopts unique seismic design, which can withstand strong long-distance transportation vibration and bumps without damage. High voltage cable: it is a high voltage resistant insulated conductor and can be dragged to the ground. ● Technological breakthroughs and powerful functions ▪ It has an external standard capacitor interface, automatically tracks the frequency of external test power supply from 40Hz to 70Hz, and supports power frequency power supply and series resonant power supply for large capacity and high voltage dielectric loss test. ▪ It has the function of discharge prompt for poor circuit contact, so as to judge whether the wiring is reliable. ▪ With CVT self excitation measurement function, C1 / C2 can be measured at the same time with one wiring, and automatically compensate the influence of bus grounding and voltage division of standard capacitor, without changing wires and connecting any external accessories, and the high-voltage connecting wire can be dragged to the ground. ▪ Chinese text menu, large screen backlit LCD display. ▪ The thermal printer is configured to print data clearly and quickly without noise. ▪ With calendar clock, it can store 100 groups of measurement data. |
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
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