简介
GDZO-1802 megger (insulation resistance tester shake table) dedicated to do the insulation test test laboratory or on-site. Contains high-precision micro-current measurement system, boost the digital system. Just use a high-tension line and a signal line connected to the sample can be measured. Automatic measurements, the results from the large-screen LCD display, and the result is stored.
The main features of GDZO-1802 megger:
1. 32-bit micro-controller, Chinese user interface, easy to operate.
2. Automatic calculation of absorption ratio and polarization index, and automatically save 15 seconds, 1 minute, 2 minutes, 10 minutes to facilitate the analysis of data per minute.
3. Output current, short circuit current is greater than 5mA.
4. Anti-interference ability to meet the EHV substation site operations.
5. Testing is completed automatically discharge, and real-time monitoring of the discharge process.
6. Included rechargeable battery and charger when not in use backlight, full power can be used continuously for 6 to 12 hours.
The following is a summary based on the Wuhan Branch Co., Ltd. Ding-field experience, the main factors affecting the resistance or resistivity test is as follows:
a. Ambient temperature and humidity
The resistance value of the material with the general increase in ambient temperature and humidity decreases. In contrast, the surface resistance (rate) sensitive to humidity, and volume resistivity (ratio) is more sensitive to temperature. Increased humidity, surface leakage increases, the body conduction current will increase. The temperature rises, the rate of movement of carriers accelerated absorption dielectric material current and conduction current will increase accordingly, according to the information reported in the general media resistance value 70C 20C when only 10%. Therefore, when measuring the resistance of the material, it must indicate the sample to reach equilibrium with the environment temperature and humidity.
b. Test voltage (electric field strength)
Resistance dielectric material (rate) value is generally not in a very wide voltage range remain unchanged, that this does not apply Ohm's law. Under normal temperature conditions, in the lower voltage range, the conductance of the current increases with applied voltage increases linearly, the resistance value of the material remains unchanged. More than a certain voltage, due to ionization motion increases, conduction current increases faster than the test voltage increases, the resistance value of the material presented decreased rapidly. Thus, the higher the test voltage is applied, the lower the resistance value of the material, so that the material resistance values at different voltages test result may have a greater difference.
It is worth noting that causes the material to change in resistance value determinant is the electric field strength test, not the test voltage. For the same test voltage, if the distance between the electrodes of different tests, the test results of the material will be different resistivity, the smaller the distance between the positive and negative electrodes, the smaller the value of the test.
c. testing time
When a DC voltage with a certain pressure on the material being tested, the test material on the current stable value is not instantaneous, but there is a decay process. At the same time pressing, a large charging current flows, followed by a relatively long period of slow decrease sinking current, and finally to the relatively stable conduction current. The higher the measured resistance value, time to reach equilibrium is longer. Therefore, when measuring the measured resistance value to read correctly, should be read after a stable value or take pressure readings after 1 minute.
Further, the resistance value of the high dielectric material further charged thereto history. Accurate evaluation of the performance of electrostatic material, when the material resistance (rate) test, should first be erasing process, and allowed to stand for some time, standing time desirable for 5 minutes, then press the test measurement program. In general, the test of a material should be at least three to five randomly selected samples were tested and the average value as the test result.
d. Leak test equipment
In the test, the insulation resistance is not high line connection, often inappropriately with the sample being tested, sampling resistor in parallel and so on, the measurement results may bring a greater impact. To do this: In order to reduce the measurement error should be used to protect technology, mounted on a large leakage current circuit protective conductor to substantially eliminate the effects of stray current on the test results;
High voltage line due to the surface ionization, on the ground there is a certain leakage, so try using high insulation, high-voltage wiring as large diameter high pressure output line and minimize wiring and reduce the tip, to prevent corona discharge;
Polyethylene, Teflon and other insulating materials test rig and the support, in order to avoid such cause low test values.
e. Outside interference
Insulating materials plus high DC voltage, the current through the sample is very small, vulnerable to outside interference, resulting in a large measurement errors. Thermoelectric power, contact potential is generally small and can be ignored; electrolysis potential is mainly wet samples with different metal contact produced only about 20mV, indeed the static test requirements in both the low relative humidity, the test in a dry environment, can eliminate electrolysis potential. Thus, interference is mainly potential coupling or stray current generated by electrostatic induction. When testing or measuring current is less than 10-10A resistance exceeds 1011; the sample being tested, the test electrode and test systems should take strict measures to shield eliminate outside interference caused by
The main features of GDZO-1802 megger:
1. 32-bit micro-controller, Chinese user interface, easy to operate.
2. Automatic calculation of absorption ratio and polarization index, and automatically save 15 seconds, 1 minute, 2 minutes, 10 minutes to facilitate the analysis of data per minute.
3. Output current, short circuit current is greater than 5mA.
4. Anti-interference ability to meet the EHV substation site operations.
5. Testing is completed automatically discharge, and real-time monitoring of the discharge process.
6. Included rechargeable battery and charger when not in use backlight, full power can be used continuously for 6 to 12 hours.
The following is a summary based on the Wuhan Branch Co., Ltd. Ding-field experience, the main factors affecting the resistance or resistivity test is as follows:
a. Ambient temperature and humidity
The resistance value of the material with the general increase in ambient temperature and humidity decreases. In contrast, the surface resistance (rate) sensitive to humidity, and volume resistivity (ratio) is more sensitive to temperature. Increased humidity, surface leakage increases, the body conduction current will increase. The temperature rises, the rate of movement of carriers accelerated absorption dielectric material current and conduction current will increase accordingly, according to the information reported in the general media resistance value 70C 20C when only 10%. Therefore, when measuring the resistance of the material, it must indicate the sample to reach equilibrium with the environment temperature and humidity.
b. Test voltage (electric field strength)
Resistance dielectric material (rate) value is generally not in a very wide voltage range remain unchanged, that this does not apply Ohm's law. Under normal temperature conditions, in the lower voltage range, the conductance of the current increases with applied voltage increases linearly, the resistance value of the material remains unchanged. More than a certain voltage, due to ionization motion increases, conduction current increases faster than the test voltage increases, the resistance value of the material presented decreased rapidly. Thus, the higher the test voltage is applied, the lower the resistance value of the material, so that the material resistance values at different voltages test result may have a greater difference.
It is worth noting that causes the material to change in resistance value determinant is the electric field strength test, not the test voltage. For the same test voltage, if the distance between the electrodes of different tests, the test results of the material will be different resistivity, the smaller the distance between the positive and negative electrodes, the smaller the value of the test.
c. testing time
When a DC voltage with a certain pressure on the material being tested, the test material on the current stable value is not instantaneous, but there is a decay process. At the same time pressing, a large charging current flows, followed by a relatively long period of slow decrease sinking current, and finally to the relatively stable conduction current. The higher the measured resistance value, time to reach equilibrium is longer. Therefore, when measuring the measured resistance value to read correctly, should be read after a stable value or take pressure readings after 1 minute.
Further, the resistance value of the high dielectric material further charged thereto history. Accurate evaluation of the performance of electrostatic material, when the material resistance (rate) test, should first be erasing process, and allowed to stand for some time, standing time desirable for 5 minutes, then press the test measurement program. In general, the test of a material should be at least three to five randomly selected samples were tested and the average value as the test result.
d. Leak test equipment
In the test, the insulation resistance is not high line connection, often inappropriately with the sample being tested, sampling resistor in parallel and so on, the measurement results may bring a greater impact. To do this: In order to reduce the measurement error should be used to protect technology, mounted on a large leakage current circuit protective conductor to substantially eliminate the effects of stray current on the test results;
High voltage line due to the surface ionization, on the ground there is a certain leakage, so try using high insulation, high-voltage wiring as large diameter high pressure output line and minimize wiring and reduce the tip, to prevent corona discharge;
Polyethylene, Teflon and other insulating materials test rig and the support, in order to avoid such cause low test values.
e. Outside interference
Insulating materials plus high DC voltage, the current through the sample is very small, vulnerable to outside interference, resulting in a large measurement errors. Thermoelectric power, contact potential is generally small and can be ignored; electrolysis potential is mainly wet samples with different metal contact produced only about 20mV, indeed the static test requirements in both the low relative humidity, the test in a dry environment, can eliminate electrolysis potential. Thus, interference is mainly potential coupling or stray current generated by electrostatic induction. When testing or measuring current is less than 10-10A resistance exceeds 1011; the sample being tested, the test electrode and test systems should take strict measures to shield eliminate outside interference caused by
参数
The main technical performance GDZO-1802 megger:
Accuracy: ± (10% + 5 words)
Measuring range: 0.1M ~ 200GΩ
Test voltage: Range: 0.5Kv ~ 5KV accuracy: 5% ± 10V
Buck: continuous smooth adjustment (500V, 1000V, 2500V, 5000V)
Short-circuit current:> 5mA
Measuring time: 1 minute to 10 minutes (measured with the way)
Charging power supply: 180 ~ 270VAC, 50Hz / 60Hz ± 1% (mains or generator power)
Working environment: Temperature -10 ~ 40 ℃, relative humidity of 20 to 80%.
Accuracy: ± (10% + 5 words)
Measuring range: 0.1M ~ 200GΩ
Test voltage: Range: 0.5Kv ~ 5KV accuracy: 5% ± 10V
Buck: continuous smooth adjustment (500V, 1000V, 2500V, 5000V)
Short-circuit current:> 5mA
Measuring time: 1 minute to 10 minutes (measured with the way)
Charging power supply: 180 ~ 270VAC, 50Hz / 60Hz ± 1% (mains or generator power)
Working environment: Temperature -10 ~ 40 ℃, relative humidity of 20 to 80%.
附件
产品证书
用途
GDZ-1802 megger (insulation resistance tester shake table) dedicated to the laboratory or test site to do the insulation test. Just use a high-tension line and a signal line connected to the sample can be measured, automatically calculate absorption
