Chroma 19055 pressure analyzer for pressure testing and analysis of the designed equipment.It has 500 va high power, maximum output ac 5 kv / 100 ma, can meet the demand of high-power withstand voltage test, and conform to the requirements of the equipment of EN50191 (detailed information please refer to the application documents).
19055 - C series in addition to the basic ac Voltage, dc Voltage, insulation resistance testing, add new research and development of Corona Discharge Detection function (Corona Discharge Detection, CDD), can be through the Analysis of Breakdown Voltage, Breakdown Voltage Analysis) were detected:
- Corona discharge inception Voltage (Corona discharge Start Voltage, CSV)
- Electrical Flashover inception Voltage (Flashover Start Voltage, FSV)
- Insulation Breakdown Voltage, Breakdown Voltage, BDV)
For testing the Contact to examine the issues, in addition to the original patent design OSC Open Short circuit detection (Open Short Check), the new High Frequency Contact Check (High Frequency Contact Check, HFCC), High voltage output contacts before inspection, test the reliability and efficiency.
To considerate users, Chroma 19055 put into large LCD display screen, easy operation and judging.In GFI human security protection circuit and Floating output design, to protect the safety of operating personnel, make your customer trouble free operation.
Measurement technology
Withstand voltage test insulation BREAKDOWN (BREAKDOWN)/electrical FLASHOVER (FLASHOVER)/CORONA discharge detection technology (CORONA)
What is a pressure bad?Most of the electrical safety standard narrative as "During the test, no flashover or breakdown shall occur", means in withstand voltage test, can not have electrical insulation flashover or breakdown occurs.But now the insulation Failure (Failure) and discharge (discharge) has become all kinds of insulation material and stress components of the most important issues.Due to the discharge and has a very high correlation between insulating ability, so the discharge detection is not only the security issues, but also the key of control the quality of the products.If classified according to the nature of the material discharge, discharge can be divided into three types: Corona discharge, Corona discharge), the spark discharge (Glow discharge), Arc discharge (Arc discharge).
Corona Discharge (Corona Discharge)
When high voltage between two electrodes, the electric field intensity is relatively large, when this effect is greater than the gas Ionization potentials (Ionization Potential), there was an instantaneous on material surface gas Ionization phenomena, at this time there will be a visible light and temperature rise.Long-term corona discharge and temperature may cause material Qualitative (Qualitative Change), resulting in Insulation Deterioration (Insulation Deterioration), which resulted in the reduction degree of Insulation resistance, Insulation failure eventually occur.Figure 1 for corona discharge.Because of corona discharge, produces the high frequency transient discharge can be detect in high frequency power measurement mode.
Bring about figure 1: corona discharge
Spark Discharge, Glow Discharge and Arc Discharge (Arc Discharge)
Internal or surface insulation materials for high voltage electrical discharge, insulation characteristics of a loss of the original object under test, form the instantaneous discontinuity or discharge, severe cases can lead to produce conductive path carbide or product damage.As pictured 2, the instantaneous instantaneous discharge detection and not to the leakage flow determination, must to test the voltage or current leakage rate determination of detection.So electrical Flashover (Flashover/ARC) detect one of the indispensable testing project for the high pressure test.
Bring about figure 2: instantaneous instantaneous discharge diagram
According to different discharge environment, Chroma 19055 provides corresponding discharge characteristic detection technology, contains the Corona discharge (Corona) detection (19055 - C only), electrical Flashover (ARC/Flashover) detection and leakage current judge (Breakdown of insulation destruction), these functions can be a development or qa unit during pressure test and analysis the best weapon.
Bring about figure 3: the degree of discharge analysis model (DLA)
BREAKDOWN VOLTAGE ANALYSIS (BREAKDOWN VOLTAGE ANALYSIS, BDV)
Passive components of high pressure pain tolerance (withstanding voltage) depends on the material and process.Is needed to improve the quality of insulation of components and the ability to analyze the extent of the discharge, which includes a Corona discharge (Corona discharge), electrical insulation Flashover (Flashover/ARC) and damage degree of tolerance (Breakdown).Chroma 19055 new Breakdown Voltage stress analyzer Analysis (Breakdown Voltage Analysis, BDV) function.Through setting up the end of the inception voltage, voltage, frequency and time, discharge degree analysis.
Breakdown Voltage Analysis (Breakdown Voltage Analysis, BDV) provides three phase judgment way, Corona discharge detection can be set (Corona limit), electrical Flashover detection (Flashover/ARC), the collapse of the insulation detection (Breakdown, high limit).Chroma when the test is bad in 19055 will be in accordance with the limit of discharge at different stages, shows the compression strength (withstanding voltage), it represent the Corona discharge inception voltage, Corona discharge Start voltage, CSV), electrical Flashover inception voltage (Flashover Start voltage, FSV) and insulation Breakdown voltage, Breakdown voltage, BDV).By these test results, the researchers can analyze the product and the research, in view of the components of the weaker insulation part to improve.
To prevent contact failure frequency examination at the time of product testing (HFCC) & open circuit detection (OSC)
High Frequency Contact Check function (High Frequency Contact Check, HFCC) is a new research and development of Chroma Contact inspection technology.HFCC design in AC/DC withstand voltage test project, when the pressure test, check whether there is a poor contact along with all the problems.H.FCC之测试频率提高至约 500KHz，可大幅提升接触检查的准确度，并有效提升产线生产效率。
In case of open circuit phenomenon, in the process of pressure testing can lead to bad product as fine products,In case of short circuit phenomenon, can be learned and early screening, reduce the harm of fixture device, save the test cost.
General pressure test the product is a capacitive (Cx), may be in dozens of pF in the normal state to u F number between, in the event of connection circuit in circuit interface form tiny capacitance (Cc) in figure 4.2, generally less than 10 pF, and presents the overall capacitance is far lower than the normal product.And when the short circuit or close to the object under test short-circuit will constantly present electric capacity is much higher than normal.So can use upper and lower limit value of capacitance change judgment, reduce the poor contact problem of production line.
 Bring in figure 4.1: normal test state |
 Bring in figure 4.2: test circuit broken Cm = Cx/Cc * (Cx) Cc + < < Cx |
 Bring in figure 4.3: test circuit short circuit Cm > > Cx |
Personnel safety protection design OUTPUT circuit function (FLOATING OUTPUT) and GROUND failure INTERRUPT (GROUND FAULT INTERRUPT, GFI)
The purpose of safety test is to protect the user's security products.And when the operators in the operation of the instrument, also need protection design of the instrument.Chroma 19055 has two kinds of operators to protect safety design to choose from, respectively, for Floating Output (Floating Output) and interrupt (GFI) design of ground failure.
In order to make the tester can use the safety testing equipment, safe secure Chroma in new technology research and development Floating output circuit, and meets EN50191 equipment safety standards.Under the conditions of Floating output, of high impedance, testers touch any pressure test terminal, grounding of leakage current (I)H.Is not more than 3.5 mA, testers are not subject to the electrical damage.As shown in figure 5.
GFI function for another human help improve circuit.As shown in figure 6 shows that can be obtained by the ammeter A1 and A2, respectively i1 and i2.When the operator to get an electric shock, ammeter respectively different measured values, the differences of i1 - i2 = IH.When IH.Too high, that is judged to be poor GFI, and immediately cut off the output signal, to ensure the safety of the user.
 Bring about figure 5: Floating output circuit diagram |
 Figure 6: bring GFI grounding failure interrupt circuit diagram |
The product application
Chroma 19055 - C stress analyzer have corona discharge detection function (CDD), for detection of corona discharge and reduce the incidence of customer complaint.And can use breakdown voltage analysis function (BDV) looking for product of corona discharge inception voltage (CSV), electrical flashover inception voltage (FSV) and insulation breakdown voltage (BDV), for the product research and development phase of the insulation capability validation, and the reliability of the product process, to provide the reference data.
Under constant voltage corona discharge detection
transformer: when use electronic products in the normal voltage, if internal primary circuit insulation fault, cause to the primary winding in the corona discharge state for a long time, after a period of time, will inevitably affect the insulating ability.Power transformer is one example, the part of the design of power transformer, would keep a set of reference coil to other circuit used, as shown in figure 7.2, under the long-term Vpk = 750 v, when the production process, such as insulating tape processing bad, bad casing, etc., cause continuous corona discharge occurs, between the primary winding insulation ability will have an effect, thus enamelled carbonization and burned.
 Bring in figure 7.1: insulating tape processing |
 Bring in figure 7.2: transformer primary process failure, leading to poor insulation |
The motor: rotating machine products such as motor or electric car motor used in industry, due to the use for a long time, and using the environment temperature and humidity change is big, the demand for high durability and reliability.Temperature and humidity also affect the elements of the insulation, if between coil and coil, and corona discharge coil of core, will lead to long-term temperature and material qualitative change, cause of insulation degradation.Join the corona discharge test functions in withstand voltage test, higher demands on the quality of the insulation, insulation ability is bad product, can be found effectively reduce the probability of adverse occurrence for long-term use.
Bring about figure 8: motor internal corona discharge
High voltage tolerance of capacitor/insulation test: high voltage tolerance test is often used in high voltage capacitor, safety capacitors, and validation of insulating material.When cracks caused by process between the insulating medium or contain bubbles, once the withstand voltage test, will form different state of electric field, corona discharge occur then.Will lead to the medium state changes for a long time, and poor insulation, any quality issues.
Bring about figure 9: bubble discharge diagram