I. Equipment Overview:
　　The capacitor durability tester complies with standards GB/T 17702-2013, GB/25121-2010; it adopts PLC + touch screen display and operation, and has functions such as automatic voltage regulation, automatic timing, 4-channel current display, test on-off and overcurrent protection; it is equipped with test sample clamps. This equipment is a dedicated equipment suitable for the durability test of AC capacitors. It is suitable for quality inspection departments and manufacturers to test the durability of capacitor products. It has overload and short-circuit protection circuits and is equipped with test fixtures with good safety performance.
 

II. Equipment Structure Features:
　　The equipment cabinet is welded with high-quality sheet metal steel, and the sheet metal is sprayed with two-color paint and sealed. The surface is treated with anti-static, anti-rust and anti-corrosion. The upper part of the equipment is equipped with a stainless steel etched panel, power switch, touch screen, start and stop buttons, high-voltage meter, etc.; the lower part of the equipment is equipped with a high-voltage output interface, which is convenient for connecting capacitor test samples; the bottom has four universal casters for easy movement. This equipment adopts PLC + touch screen control, and the high-voltage adjustment adopts a stepping motor structure voltage transmitter for closed-loop control, without manual adjustment, and automatically and quickly stabilizes to the set voltage value. The touch screen can set the voltage output value, and switch to the discharge mode after testing for a period of time; the discharge mode can set the power-on time and power-off time, and the number of tests; after the test reaches the setting, it switches to the normally-on mode; the equipment is reasonably designed, easy to use, simple to operate, reliable in performance, and beautiful in appearance.
 

III. Main Technical Parameters:
1) Power supply: three-phase AC380V 50Hz 20KVA;
2) Test stations: 2 stations;
a) Load capacity of each station (maximum): 100μF;
b) Each station is equipped with a discharge resistor to limit the discharge current to 2 times the rated current;
3) Test voltage:
AC 0～1000V; Voltage accuracy: ± 5 % ± 2 digits;
Maximum output current: 20A, 1 channel;
DC 0～1000V; Voltage accuracy: ± 5 % ± 2 digits;
Maximum output current: 20A, 1 channel;
4) Long power-on test time: 0～999.9h, continuously adjustable, the capacitor automatically enters the discharge mode after the test is completed, and enters the long power-on mode after the discharge mode test is completed;
5) Discharge mode:
Power-on time: 0~999.9s;
Discharge time: 0~999.9s;
Test times: 1~999999 times
6) System control and measurement: Touch screen + PLC programmable controller control, two-channel A/D conversion module for measurement;
7) Parameter display and setting: 7-inch TFT true color LCD touch screen;
8) Automatically determine whether the capacitor of each station is abnormal, and stop timing the test data of the station;
9) Each test station can be easily switched to access the test;
10) Overcurrent and overvoltage protection, each data has power-off protection function;
11) Accessories: Two capacitor test clamps, 2 sets of high-temperature test wires;
12) Tester cabinet size: (W*D*H) 800*780*1800mm;
13) Equipped with high-temperature box: RT room temperature ~ 200℃ adjustable, temperature uniformity ±2 degrees:
a) The box body is welded with high-quality steel plates, and the working room is made of stainless steel or high-temperature resistant silver paint;
b) The four corners of the inner tank are semi-circular arcs, which are convenient for cleaning, and the shape is novel, beautiful, and energy-saving;
c) Microcomputer intelligent digital display temperature controller, temperature control accuracy is accurate and reliable;
d) The hot air circulation system is composed of a low-noise fan and a suitable air duct, and the temperature in the working room is uniform;
e) Temperature control instrument: The product adopts comprehensive electromagnetic compatibility design and user-friendly menu design, and adopts the company's independently developed adaptive temperature control technology for temperature control, which makes the equipment operation completely fool-proof and solves the problems of multiple parameter setting and temperature overshoot required by the previous PID control technology. The temperature control effect is excellent. Dual-screen high-brightness wide-window digital display, the indicated value is clear and intuitive. Microcomputer intelligent control, after setting the temperature, the instrument will control the heating power by itself and display the heating status, the temperature control is accurate and stable. Over-temperature alarm and automatic cut off of heating power. It has a timing function, and the timing time is up to 9999 minutes;
f) Insulation layer: Domestically created, high-performance insulation structure. From the inside to the outside, there are inner cavity, inner shell, ultra-fine glass fiber, aluminum reflective foil, and air interlayer, and the heat loss of the inner tank is small. The inner tank, outer box and door tank mechanism are unique, which greatly reduces the outward transmission of heat from the inner cavity;
g) Internal structure of the box: The heat of the electric heater placed on the back of the box is discharged forward through the side air duct, and then sucked into the back by the high-performance special fan after passing through the dried object, forming a reasonable air duct, which can make the hot air fully convect and maximize the temperature in the box to reach uniformity;
h) Observation window: Each box door has a glass observation window, which can observe the test status in the box at any time;
i) Adjustable new air inlet: control the amount of air entering and leaving the box, and the rear of the box is equipped with an exhaust port that can be closed or adjusted to play a role in ventilation;
j) Sensor: Class A PT100 platinum resistance; Heating method: nickel-chromium alloy electric heater.
 

IV. Equipment Use Environment
a) For indoor use, and the indoor ventilation is good.
b) The altitude does not exceed 2000 meters.
c) The ambient temperature is -10℃～+50℃.
d) The average daily relative humidity is not greater than 95%, and the average monthly relative humidity is not greater than 90%.
e) No strong vibration and shock.
f) No severe dust, explosive hazardous media, corrosive metals and harmful gases that damage insulation, conductive particles, and severe mold around.
g) Vertical inclination is no more than 5 degrees.

Capacitor self-healing test
This experimental device fully meets the requirements of GB/T 17702-2013 and GB/25121-2010 standards, and is suitable for the self-healing test items of power electronic capacitors applicable in rail transit vehicles. Parallel reactor is used for precise compensation to reduce the total circuit current. The test voltage, the current of the capacitor under test, and the total circuit current are displayed digitally in real time. During the test, the system automatically collects and records the number of self-healing times and the voltage value when 5 times are reached or the set voltage value is reached, the test voltage is automatically reduced by 0.8 times, and delayed for 10 seconds, and then automatically shut down.
1. Test AC voltage: 0～1750V              Digital display ±2％FS
  The maximum self-healing voltage can be set separately: resolution is 1V
  Boosting speed: about 10～200V/minute, accuracy about ±10V
2. Capacitance current: 1～83A                Digital display  ±1％FS
  Inductance current 1～83A                Digital display  ±1％FS
  Total current    0.1～5A               Digital display  ±2％FS
3. Load: 1 piece
Rated voltage ≤500V, capacity 1～100uF
4. Self-healing times: 1～9999 times can be set
5. Test box: volume about 5 liters, with power-off protection when opening the door
6. Inter-pole withstand voltage mode: automatic voltage increase, start timing when the voltage increases to the set value, automatic when the time is up
Self-healing test mode: first test the inter-pole withstand voltage, and then automatically control the voltage increase speed (about 100V/minute), the self-healing times or voltage to the set value can automatically reduce the voltage to 0.8 times the voltage and then run for the set time (usually set to 10S), and then shut down
7. Control instrument description: automatically control the rate of increase and decrease of the test voltage, automatically record the number of self-healing times, self-healing voltage, time, automatically determine whether the sample fails, data records can be queried and printed out
A, PLC+LCD touch screen control design, beautiful and generous, easy to operate.
B, Automatically control the voltage increase and decrease rate, and time control, automatically reduce the voltage and cut off the output when shutting down;
C, It can automatically perform inter-pole withstand voltage test first, and then perform self-healing test;
 D, Automatically collect and record the voltage value at the number of self-healing settings or when the set voltage value is reached, the test voltage is automatically reduced by 0.8 times, and delayed for 10 seconds, and then automatically shut down.
8. Introduction to the method of collecting self-healing times:
A high-frequency pulse detection device is installed in the test box, and the waveform of the capacitor self-healing is tested by the pulse method. When a self-healing occurs, the number of self-healing times automatically increases by one.
9. This equipment can also be used for the inter-pole withstand voltage test of capacitor leads.
10. The equipment can automatically compensate according to the input compensation amount, and has automatic voltage regulation and automatic timing functions; it has overcurrent, overvoltage protection and delay protection; it has leakage protection to ensure safe operation of the test.
11. Approximate dimensions of the equipment: width 1800mm, depth 900mm, height 1600mm, weight about 600kg
12. Use environment: 0～40℃, relative humidity ≤90% and no condensation, no steam and corrosive gas
13. Power supply: AC220V, 50/60Hz, 10KVA
14. The main control accessories of the equipment adopt imported brands and domestic famous brands, with reliable control and stable performance.