LJC-50DBreakdown voltage meter

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one Overview

thisinstrumentAccording to the newly issued national standardGB/T 1408.1(Equivalent to)IEC60243-1）Test Method for Electrical Strength of Solid Insulation Materials Test under Power Frequency.

Mainly used for various electrical purposesInsulation paperfilm, Softcomposite materialResin glue and rubber, plasticWaiting for insulation materialsbreakdown voltage andElectrical strength testing.

two Features

1The main control part is controlled by SiemensPLCand10Cunbu Ke touch screen control improves anti-interference performance, voltage and current measurement accuracy, and operational convenience;

2High precision voltage samplingADConvert and control the voltage accuracy within1.5%Within;

3Voltage endurance time from1sto30minFree to set;

4During the withstand voltage test, there is a step control voltage stabilization function;

5Equipped with automatic discharge rods to enhance safety and reliability;

6The current value is displayed in digital format, which is intuitive and highly readable;

7Add monitoring functions such as closing, zero position, boosting, and lowering on the control interface;

8Boosting speed from（0.1～5.0）kV/sAdjustable;

9Real time monitoring function for voltage and current;

10Software current protection and voltage protection functions, hardware current protection and voltage protection functions;

11There is a linear correction function for voltage and current on the touch screen interface, which can be adjusted freely, conveniently, quickly, and efficiently.

three Main technical parameters

1 Maximum test voltage:AC/DC 50.0kV

2 Effective voltage measurement range: up to the maximum test voltage value（20～100）%

3 Accuracy of test voltage: better than1.5%（20%～100%Relative error within the effective voltage measurement range

4Capacity:3kVA

5Rectified silicon stack:200kV0.2A

6Filter capacitor:50kV20000F

7 Protection resistor:25kΩ

8 Trip time: ＜40ms

10 Boosting speed:（0.1～5.0）kV/s

11 Voltage endurance time range:1s～30min Accuracy: ＜0.1%

12 Test current:5～50mA

13 Overcurrent protection:5～50mAadjustable

14 Suggested use of environmental temperature and humidity:（23±2）℃ （50±5）%

15 power supply220V±10% 10 A 50HzNo need for leakage protection

four Structure and composition of touch screen voltage breakdown tester

1 This system consists of two parts

（1）Control section. The breakdown instrument host is equipped with an electrical control system to control the rise and fall of high voltage, measurement, start and stop of tests, identification and tripping protection of breakdown and flashover, judgment of test termination, and display of data.

（2）High voltage testing section. Composed of a test transformer, protective resistor, electrode system (optional), etc.

2 Size and Weight

Size:about750 mm(Deep) ×650mm(Width) ×1200mm(High)

Weight:about200kg

five Introduction to Working Principle

thisinstrumentfromControl section and high-voltage testing sectionform. fromPLCtouch screenControl the operation of the entire instrument，itsSee schematic diagramimage1.

Set the boost mode, test voltage value, and withstand voltage time value on the touch screen settings interface. After determining the boost speed, return to the main interface and startrunAfterwards,PLCAccording to the pre-set boosting methodandStep up speed control stepper motorThusDrive the voltage regulator to increase the test voltage,andsynchronizationMeasure the test voltageDisplay the voltage value on the touch screen and plot the real-time curve. Connect a protective resistor in series with the high-voltage end of the transformer to the upper electrode of the electrode system and apply it to the sample.

When the test voltage reaches the preset value and the withstand voltage is maintained for a certain period of time (the boosting method is constant withstand voltage), if the sample has not yet broken down, the system will automaticallyReduce voltage to zerotripIf the sample breaks down during the boosting process, the overcurrent relay will quickly cut off the circuit and automatically reduce the voltage back to zero, and the touch screen will maintain the display of the highest breakdown test voltage value.

six Introduction to panel control functions

6.1 frontpanel

（1）startindicator light.Located on the right side of the console,When this light is onIndicates that it has been started and the main circuit is connected,Indicating that the test transformer has been testedThere is voltage.

（2）Red emergency stop button.Located on the right side of the console, pressing this button in emergency situations will cut off the main circuit voltage. This button has a self-locking function and can be unlocked by rotating clockwise.

（3）touch screen. Located in the center of the console, it is used to set test parameters, display measurement values, plot curves, monitor display status, and perform button operations.

（4）Power switch.Located on the consoleright sideEdge,In case of emergency, this switch can be disconnected to control the power supply provided to the control section and high-voltage testing section.

6.2 afterpanel

（1）220Vpower supplyneedleSeat (Four Core Aviation)needleSeat).Connect the power cord to provide power for the control and high-voltage testing sections.

（2）groundingpillar.Connect the control cabinet casing, power grounding wire, filtering system to the grounding system (earth).Touch screen voltage breakdown tester