Chroma 19501 - K Partial Discharge tester built-in ac withstand voltage Test (Hipot Test) and Partial Discharge (Partial Discharge, PD) detection functions in A single machine, ac output voltage 0.1 kV ~ 10 kV, leakage current measuring range 0.01 mu to 300 mu, A Partial Discharge detection range 1 PCS to 2000 PCS, in view of the high voltage semiconductor devices with high insulation material testing application design and development.
Chroma 19501 - K partial discharge tester product design in line with the regulations IEC60270-1, in view of the high voltage test technology of partial discharge test requirements, using Narrowband filter (Narrowband) measurement technology of PD discharge measurement, and the measurement results for direct numerical (pC) displayed on the screen for the users to clear the test object under test to judge the results.
On product design, in addition to meet IEC60270-1, but also conforms to the optical coupler IEC60747-5-5 and VDE0884 regulations, built-in IEC60747-5-5 test method of laws and regulations within the instrument and meet the demand of optical coupler products production testing, and provide the users convenient operation interface.
When performing a high voltage test on production line, if failed to correct and good connection object under test test line, will cause the failure of the test results and even the risk of missing, so before the test to ensure good connection with the test object under test line is very important.Chroma is unique and High pressure Contact Check function (High Voltage Contact Check: HVCC) system using the Kelvin test method for High insulating ability of components, Contact inspections on High Voltage output synchronization, increase test effectiveness and production efficiency.
In solid insulation air gap or impurities mixed in the insulating layer, the rated working pressure condition, due to the high electric field strength to focus on the air gap produced by Partial Discharge (Partial Discharge), continuous Partial Discharge will insulation material degradation around for a long time, and affect the long-term reliability of electrical products, and cause safety accidents.
Applied to the safety of power system components, such as optical coupler, due consideration if the components for a long time partial discharge for the destruction of insulation materials, and insulation failure happens, causing users' personal safety issues;Therefore, in the IEC60747-5-5 regulations mentioned, in the process of production (Routine test) must be performed 100% Partial Discharge (Partial Discharge) detection, in the largest insulation voltage power under the condition of no more than 5 PCS, ensure that the product in normal working conditions of Partial Discharge phenomenon will not occur.
Partial discharge tester is aimed at high pressure of the optical coupler, high voltage relay and high voltage switch high insulation tolerance of components, provides the high voltage withstand voltage test and partial discharge detection, to ensure product quality and improve product reliability.
Partial discharge means a discharge in insulation object in the local area, and did not form a fixed channel discharge between two electrodes called partial discharge.
Partial discharge tester to Test on a specific voltage, under the condition of measuring the apparent charge discharge (PD), in addition to verify its ability to withstand instantaneous high voltage (Hipot Test), but also to verify the rated working voltage of the insulation integrity.Partial discharge test can detect whether there is abnormal air gap object under test, element through applying a slightly higher than the rated working voltage of partial discharge test charge, used to test electrical components under the condition of normal working voltage of the reliability for a long time, but in actual production one hundred percent internal insulation materials will not, of course, no air gap exists in the insulation material, so the IEC60747-5-5 optical coupler and regulations in view of the partial discharge test defines its discharge charge is not greater than 5 PCS (q)Pd.= 5 PCS).
Solid insulation within bubbles produced by partial discharge instructions
- The dielectric coefficient of air is lower than the insulation material dielectric coefficient, so bubble in the electric field intensity will be greater than the partial pressure of normal insulation
- Affordable electric field intensity and lower than air insulation material, easy in the bubble bubble Discharge (Void Discharge)
Ca: equivalent capacitance of the remainder of insulating medium
Cc: air gap equivalent capacitance
Cb: insulating medium with the equivalent air-gap series capacitance
Partial discharge test equipment used to measure and determine the small discharge, the signal is very small and fast, so the partial discharge test equipment must be accurate correction can ensure that partial discharge occurs in high frequency discharge signals can be measured accurately.Corrector on the use of standard capacitance C0Usually in the form of a low voltage capacitor, partial discharge tester perform PD calibration equipment is under the conditions of no charge for correction, for PD charge q0= V0C0.As shown in figure:
U: working voltage
Z: isolation resistance capacity
Ca: the object under test
Ck: coupling capacitance
Zm: input impedance measurement system
CD: coupling device
Cc: test line
MI: amount of partial discharge test device
PG: square wave generator
V0: a rectangular wave voltage
Chroma 19501 - K has partial discharge measurement with high resolution, with two measurement gear, respectively for 200 PCS and 2000 PCS gear, measurement range from 1 PCS to 2000 PCS, 200 PCS gear under the best resolution of 0.1 pC, high-precision measurement and visual measurement result shows that on the picture, help to small discharge high insulation object decision and analysis.
Partial discharge test apparatus for narrow frequency domain filter measured components used to measure small discharge, test equipment in the factory, however, the use is different from in the laboratory, factory environment is relatively more interference factors, may contain from field automation, mechanical operation of the motor actuation or other high frequency radiation interference;So on the production line to use its environmental noise interference will be increased, thus affect PD measuring and judging, how to reduce and avoid partial discharge equipment measurement circuit by high-frequency radiated interference, for production industry and automation business is a big issue.
Partial discharge occurs when the discharge reaction speed is usually nS, for high frequency discharge and its signal is very small, so it is easy to around the high frequency radiation disturbance and measurement error, cause increasing uncertainty measurement system, how to do precise measuring PD discharge and must avoid these high frequency radiation disturbance, in partial discharge instrument design technology is a challenge.
Bring about anti-jamming structure design
Chroma 19501 - K partial discharge tester to know the use of the equipment may be inevitable high-frequency radiated interference in the environment, so in product design and architecture design, measurement and display unit separated offshoring will measure module, with the closest approach to measurement of the object under test, reduce because of the long distance test line in susceptible to high frequency radiation interference environment.At the same time the measurement signal isolation method is used to design circuit design, to test the shortest loop way using probe qualification and back to the terminal at low pressure with copper ring isolated environment radiation interference, prevent PD measurement circuit of external noise interference to ensure measurement accuracy.
Bring about Chroma 19501 - K
Use separate architectural design to reduce the high frequency radiation disturbance, to ensure measurement accuracy
Bring it to PD tester
Will test line stretched and contact object under test, susceptible to interference, high frequency radiation surrounding environment accurately judging
Optical coupler law application
In IEC60747-5-5 rules, related to optical coupler electrical safety requirements, safety test and test method of project has been clearly defined, such as optical coupler components are provided with an application security guidelines.Chroma19501 - K Partial Discharge tester in accordance with laws and regulations for electrical safety testing requirements and Test methods, rules for optical coupler as defined in the process of production must be 100% to perform Partial Discharge Test, Partial Discharge Test), and set out Partial Discharge Test voltage required to provide to production industry reference standards, production Test, Partial Discharge Test voltage multiplied by the nominal definition to 1.875 times the constant high voltage insulation or repeat the maximum peak voltage insulation voltage value the most (), as a Partial Discharge Test voltage, the reference voltage calculating formula is as follows:
Conform to the IEC 60747-5-5 with VDE test 0884 regulations
Chroma 19501 - K products for optical coupler industry application, built-in IEC60747-5-5 regulations required in the test method (b1), method (b2) and method (b3), and other three test model, and display auxiliary reference for users to program edit Settings, help users learn quickly and convenient instrument operation, improve operating efficiency.
Bring method (b1)
Bring method (b2)
Bring method (b3)
Three sections of voltage test
In addition to meet the requirements of optical coupler and regulations test, Chroma for optical coupler in the production process to conform to the regulations of partial discharge test requirements, some manufacturers on production process needs extra to a test voltage of the above rules apply to high voltage test and add PD put power detection, to enhance the quality of components and factory internal and strict quality control, but in the plus strict detecting epigenetic trade will still have to test the voltage drop to rules on the test voltage (Vpd) to perform inspection, confirm the product conform to the regulations.Chroma 19501 - K unique three voltage test function, aiming at this type of manufacturers to increase the third stage quality control testing voltage, can at the same time meet the regulatory requirements and the purpose of the production quality control.
PD adverse occurrences decision setting
Partial discharge tester on the element insulation quality small discharge must be able to accurately measure the component, when PD occurs when the signal is very small, and vulnerable to environment caused by the high frequency radiation interference in measurement deviation, thus to reduce the production process caused by external disturbance and miscarriage, Chroma 19501 - K partial discharge tester can provide users set PD set for judging adverse occurrences, ensure measured in partial discharge device to discharge from rather than the object under test environment one-time disturbance.
When local discharger when applying high voltage solid insulation, hole in the solid insulation gap discharge will be accompanied by periodic discharge voltage change occurs, thus the high frequency noise power compared to the environment is relatively stable and ongoing, so the design of 19501 - K judgment discharge must be accumulated four straight voltage occurs at least once a half wave cycle, the maximum discharge accounting for only once, to determine if any happen in number did not occur in a row, the PD adverse occurrences judgement will be zero and count again, until been surpassed the number of times the user test results for poor judgement.
Bring about bad examples - PD frequency set to 5 conviction yourself
HVCC high-voltage contact checking
For High insulating ability of the components in the examination of the Contact is very important, the output of the High pressure of Chroma High Contact checking (High Voltage Contact Check: HVCC) is the use of Kelvin test method, in view of the components in high-pressure output of High insulating ability of synchronized Contact Check, in order to enhance the test reliability and production efficiency, its application circuit schematic wiring as shown:
