Insulation Tester Manual 7700元*******Insulation resistance tester dedicated to the measurement of water-cooled generator test, but also can be used for laboratory or field testing insulation testing to do. Output current greater than 25mA. The maximum output voltage of 2500V. Includes high-precision micro-current measurement system, digital boost system. Just use a high-voltage lines and a signal line connecting the test product can be measured. Automatic measurement, the results from the large screen liquid crystal display, and store the results。Ⅰ the main features of1. 32-bit micro-controller, Chinese user interface, easy to operate.2. 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, short-circuit currents greater than 5mA.4. A fully enclosed high-voltage generator module technology, the protection of the internal resistance, safe and reliable.
Anti-interference ability, to meet the EHV substation on-site operation.5. Automatic discharge test is completed, and real-time monitoring the discharge process.Ⅱ the main technical performanceAccuracy: ± 10%Range: 0.1M ~ 200GΩTest voltage: 0.5Kv ，1KV，2.5KV，5KVShort circuit current:> 5mAMeasuring time: 1 minute to 10 minutes (with the measurement related)Power Supply: 180 ~ 270VAC, 50Hz/60Hz ± 1% (utility or generator power)Working Environment: Temperature -10 ~ 40 ℃, relative humidity 20 to 80%.32*27.5*14兆欧表 5kgs尺寸和重量、Ⅲ the operating components function1. (L) "L" for the high-voltage output,2. (G) “G” connected to the shielding ring3. (E) Connected to GND.Ⅳ notes and otherPlease pay attention to safety, "the line" for the high side! 1G = 1000MV. HowMeasurement operationEnter the initial setup screen (Figure I)Initial setup screen (Figure I)1. The initial measurement of the icon is selected, the following shows 2500v that measure voltage.(1) Press → key to store the icon to set the clock icon in the icon is selected loop(2) Press the start / stop button for 1 second to start the measurement, display measurement of the screen (Figure II) Display the measurement screen (Figure II)Said test voltage 2500v105 M measured in large print that the instantaneous value02'45 "for the time measurement process05-05-24: Measurement Date15 "indicates the value measured 15 seconds01 'is the value measured 1 minute10 'is the value measured 10 minutesAbsorption ratio DAR DAR = R60s/R15sPI PI = R10m/R60s polarization ratio(4) the measurement process by start / stop button, or the end of the measurement, display discharge screen (Figure III) 600VDischarge screen (Figure III)transient voltage discharge process. At this time must not touch test and measurement product line! So discharged, the user manual discharge of the test items.(5) After completion of discharge into the measurement results stored in the screen (Figure D)Store measurement results screen (Figure D)
Right half of the screen as part of the data and measurements, please refer to display the measurement screen (Figure II) shows[007]: the serial number of that stored measurement dataPress → key to exit 007 can store cycle is selected.Exit is selected in the store when the press start / stop button to return to the initial setup screen (Figure I)[007] in a selected time, press the → key to move the selected bit, ↑ ↓ key to modify the serial number.2. When the clock icon is selected.(1) The start / stop button, 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)(3) SET is selected by start / stop button in the date, time, a small arrow appears below↑ ↓ key to change the date at the time.(3) Amend complete, press the start / stop button setting is selected.(4) Press the → key allows setting and exit the loop is selected. In the modification date and time when the cycle moves small arrow3. When the store icon is selected(1) The start / stop button to store the data into the view screen (Figure VI)See store data 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 button next page →(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 VIISettings 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)about the principle instrumentSome features of eachLCD Keypad: Responsible for the keyboard, 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. With short circuit protectionDivider 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.Resistance or resistivity of the main factorsa. Temperature and humidityGeneral 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. Humidity increases, 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 hb. 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 timeDC 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 equipmentIn 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 interferenceInsulating 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
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