HZJY-10K Insulation Resistance Tester Megger

HZJY-10K Insulation Resistance Tester Megger

Insulation Resistance Tester Megger Instruction
Huazheng Electric Manufacturing(Baoding) Co.Ltd
Contents
I Main Features............................................................................................3
II Main Technical Performance...................................................................3
III Function  ..................................................................................................4
IV Notes  ......................................................................................................4
V Operation Method....................................................................................4
VI.Influence  Factor......................................................................................9
VII.Company Profile....................................................................................11
HZJY-10K  Insulation Resistance Tester dedicated to the measurement of water-cooled  generator test, but also can be used for laboratory or field testing. The output  current is greater than 5mA. The maximum output voltage is 10KV. It includes  high-precision micro-current measurement system and digital boost system, which  uses a high-voltage line and a signal line connecting with the test product. The  results from the large screen liquid crystal display and store the results with  automatic measurement.
?Insulation Resistance Tester Megger Main Features
1.  32-bit micro-controller, English interface, easy to operate.
Automatically  calculates the absorption ratio and the polarization  
index, and automatically save 15 seconds, 1  minute, 2 minutes,
10  minutes to facilitate analysis of data per minute.
3.  Output current and short-circuit current are greater than 5mA.
Anti-interference ability, which meets the  EHV substation on-site   operation.
With a fully enclosed high-voltage generator module technology,and the protection of the internal resistance is safe  and reliable. Automatic  discharge after testing and real-time monitoring the   discharge process.
? Insulation Resistance Tester Megger Main Technical Performance
Accuracy:  ± 10%
Range:  0.1M ~ 400GO
Test Voltage: 0.5KV,1KV,2.5KV,5KV,10KV
Short Circuit Current:?5mA
Measuring Time:  1 minute to 10 minutes (related to the measurement )
Power  Supply: 180 ~ 270VAC, 50Hz/60Hz ± 1%
Working Environment: -10~40? Humidity:20~80%.
? Insulation Resistance Tester Megger Function
1. (L)   " L"   for the high-voltage output,
2. (G)  “G” connected to the shielding  ring
3. (E)    Connected  to GND.
? Insulation Resistance Tester Megger Notes
Please  pay attention to safety, “L”is the high voltage side, “E”is GND (Must Connect  to The Earth)  1G = 1000M
V. Insulation Resistance Tester Megger Operation Method
Enter  The Initial Setup Screen (Figure I)

The  initial measurement of the icon is selected, the following shows 2500v measure  voltage.
(1)  Press increase or decrease to adjust the voltage
(2)  Press ? key to change the selected part(test date save set)
(3)  Press the start / stop button for 1 second to start the measurement,
Display  Measurement of The Screen (Figure II)

2500V    testing voltage
105 M    instantaneous value
02'45 "   time of the measurement  process
05-05-24 measurement date
15 "      the value of testing  15 seconds
01 '     the value of testing 1 minute
10 '     the value of testing 10  minutes
DAR      absorption ratio    DAR =  R60s/R15s
PI       polarization ratio  PI = R10m/R60s
Press  start / stop button at the end of testing,showing
Display  Discharge Screen (Figure III)
600V        
600V is the transient voltage discharge process.
Do not touch the sample and the  product line at the same time.
After testing,suggesting user manual discharge of specimen.
After  discharge,it enters into results of the measurement
Display the Saved Screen (Figure D)  

    
Right half of the screen as part of the data and measurements, please  refer to display the measurement screen (Figure II) [007]:  stored number of the measurement data
Press ? key to quit the selected part.
Press start / stop button to return to  the initial setup screen (Figure I)
Press the ? key to move the selected  bit, ? ? key  
to modify the serial number.
2.  When the clock icon is selected.
(1)  Press he start / stop button to enter the time display and setting screen  (Figure E):

(2)  QUIT is selected out by start / stop button to return to the initial setup  screen (Figure I)
SET  is selected by start / stop button in the date, time, a small arrow appears  below ? ? key to change the date at the time.
(4)  Amend complete, press the start / stop button setting is selected.
(5)  Press the ? key allows setting and exit the loop is selected. In the  modification date and time when the cycle moves small arrow
3.  When the store icon is selected
(1)  The start / stop button to store the data into the view screen (Figure VI)

(2) The right half of the screen  as part of the data and measurements, please refer to display the measurement  screen (Figure II) shows
(3) [000] to [007] that serial  measurements
(4) Press the ? ? keys to [000] to  [007] is selected on the right shows the number of data
(5) Press the start / stop button  to return to the initial setup screen (Figure I)
4.  When the Settings icon is selected
(1)  The start / stop button, enter the setup screen (Figure VII)

(2)  Press the ? key to make the TIME ALARM etc loop  is selected.
(3)  Press the ? ? keys to change the appropriate settings
(4)  Press the start / stop button to return to the initial setup screen (Figure I)
5.  Structure
6.Function
LCD  Keypad: Responsible for the keyboard and display.
NC Regulator:  PWM circuit producing high-efficiency standards for 0-5V output. DC-DC  0-10Kv: with step-up transformer, high conversion, high voltage DC output 10kv,short  circuit protection
Divider Circuit:  10KV high pressure, converted to 5V, to facilitate AD collection.
Measuring Circuit:  for data acquisition, current transformation.
Controller:  will all of these modules to complete the measurement.
VI.Influence  Factor
a. Temperature  and Humidity
General  resistance of the material with the increase of temperature and humidity  decreases. In contrast, the surface resistance (rate) is sensitive to  environmental humidity, and body resistance (rate) is more sensitive to  temperature. When the humidity increases and the surface leakage increases, the  body will increase the conduction current. Temperature, the movement of the  carrier rate is accelerated dielectric absorption current and conduction  current will increase accordingly, according to the information reported, the general  media in the 70C 20C when the resistance is only 10% of the time. Therefore,  the measurement of resistance of the material, you must specify the sample to  reach equilibrium with the environment temperature and h
b. Test Voltage  (Electric Field Strength)
Dielectric resistance  (rate) values are generally not in a wide voltage range remain unchanged, that  this does not apply Ohm's law. Room temperature, at a lower voltage range, the  conduction current with the applied voltage increases linearly added, the  resistance value remains unchanged. After more than a certain voltage, the ion  of motion increases and the increase in conduction current increases faster  than the test voltage, the resistance of the material is decreased rapidly.  Thus, the higher the test voltage applied, the lower the resistance of the  material, resulting in different voltage resistance test in the material may  have a greater difference.
It is  noteworthy, resulting in material changes in the determinants of resistance is  the test of the electric field strength, rather than the test voltage. On the  same test voltage, if the distance between the electrodes of different tests on  the test results of resistivity will be different, the smaller the distance  between positive and negative electrodes, the test value is smaller.
c. Test Time
DC voltage with a certain  pressure on the material being tested, the test materials to stabilize the  current value is not instantaneous, but there is a decay process. The pressure  at the same time, charging current flows through the larger, then more time to  slowly decrease the absorption of current, the conductance of the last to  achieve more stable current. The higher the measured resistance value, time to  reach equilibrium is longer. Therefore, the measurement in order to properly  read the test resistance, should be read in the stable value or to take  pressure readings after 1 Minute.
In addition, high  insulation resistance value is also related to its charged history. For  accurate evaluation of electrostatic properties of materials, materials in the  resistance (rate) test, should first deal with its power consumption, and  standing some time, the standing time desirable for 5 minutes, and then, and  then measure the program testing. In general, a material testing, at least 3 to  5 randomly selected samples were tested, with its average value as the test  results.
d. Leak Test Equipment
In the test, the  circuit connection is not high insulation resistance, often inappropriately  sample being tested, such as parallel sampling resistor, the measured results  may bring a greater impact. To do this:
To reduce  measurement error protection technology should be used in the leakage current  of the circuit protective conductor installed to basically eliminate stray  current effects on the test results;
High-voltage  lines due to surface ionization, some leakage to ground, so try to use high  insulation, large diameter high-voltage wire as the high voltage output cable  and the connection as short as possible to reduce the tip, to prevent corona  discharge;
Polyethylene,  Teflon and other insulating materials test bed and support the body in order to  avoid the causes of such tests was lower.
e. Outside Interference
Insulating material with high DC voltage, current  through the sample is very small, vulnerable to the impact of outside  interference, resulting in a larger test error. Thermoelectric potential,  contact potential is generally small and can be neglected; electrolytic  potential is mainly wet specimens produced with different metal contacts, only  about 20mV, and indeed the static tests require relatively low humidity, when  tested in a dry environment, you can eliminate potential electrolysis.  Therefore, outside interference is mainly the coupling of stray current or  potential generated by electrostatic induction.
In the test current is less than 10-10A or measuring  more than 1011 ohms resistance; being tested samples, the test electrode and  the test system should adopt strict screening measures to eliminate the impact  of outside interference Company  Profile
Company  Name : Hebei Huanhai Import & Export Trading Co., Ltd
Add : Room 510 Chaoyanglongzuo B Building
No.1178Chaoyang street, Baoding, Hebei,China
Tel : 0086-312-3372757