| Customization: | Available |
|---|---|
| After-sales Service: | Yes |
| Warranty: | 1 Year for Insulating Resistance Test Set Megger |
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Insulation Resistance Tester 10kv Megger Meter Ohm Meter
A megohmmeter, often informally referred to as a "megohmmeter", is an instrument specifically designed to assess the resistance of insulating materials. High voltage electrical equipment and systems require regular insulation resistance testing, particularly during commissioning and maintenance phases, to ensure the integrity of insulating components such as cable sheaths.
~ The digital insulation resistance tester has a built-in real-time industrial control microcomputer operating system, and the ultra-thin linear meter head is perfectly combined with the dot matrix LCD display.
~ The insulation resistance value is displayed synchronously in two ways.
~ The use of analog pointers can easily observe the range of changes in insulation resistance, and the use of digital display can accurately obtain the measurement results.
~ Adopt embedded industrial single-chip microcomputers and real-time operation software systems.
~ High degree of automation and strong anti-interference ability,
~ The instrument can automatically save the test results without manual intervention. The operation interface is friendly
~ Various measurement results have anti-power-off function, and can continuously store 19 measurement results
~ When the instrument generates high voltage, there is a prompt sound output and a corresponding display.
~ AC and DC dual-purpose, equipped with rechargeable batteries and AC adapters.
~ The instrument adopts a portable design for easy field operation.
~ Automatic calculation of various insulation indicators (absorption ratio, polarization index)
~ All measurement characteristics have anti-power-off function
| (1) | EARTH | Connected to the shell of DUT or on the ground. |
| (2) | GUARD | Connected to HV retaining ring of DUT in order to eliminate the effection of surface leakage current.. |
| (3) | LINE | High-voltage output terminal, connected to high-voltage conductor of DUT. |
| (4) | LCD Display | Display test results and setting parameters |
| (5) | SETTING | MEM (Memory):Saving test data or view historical test data, keep pressing more than 3 seconds to delete all the stored datas. Time Setting: Setting Time using the button (Time1,Time2,Time3) Auto off (Backlite):Press the button to light up LCD backlight, and automatically turns off after 90 seconds. Up:Press to forward read data or modify data; Down:Press to back read data or modify data |
| (6) | INDICATOR | Showing HV output, power supply working,charging ... |
| (7) | TEST KEY | Press Start testing, clockwise rotation can be locked after pressing the button |
| (8) | CHARGING JACK | 15-19V DC |
| (9) | SHIFT | Selecting Output voltage, also power switch |
Resistance to be measured is connected across the terminals i.e. connected in series with the deflecting coil and across the generator. When the current is supplied to the coils then they have torque in opposite directions.
If resistance to be measured is high, no current will flow through the deflecting coil, the controlling coil, will, therefore, set itself perpendicular to the magnetic axis and hence set the pointer to the infinity.
If the resistance to be measured is small, high current flow through the deflecting coil and the resulting torque sets the pointer to zero.
For the intermediate value of resistance, depending upon the torque production, the pointer is set at a point between zero and infinity.
The hand-driven generator is of the permanent magnet type and it is designed to generate from 500 to 2500 volts. Testing voltage is produced by the rotation of the crank in a hand-operated megger, or by the battery in the case of an electronic-type megger. For testing a range up to 440V, equipment requires 550V DC is sufficient. The current coil or deflecting coil is series-connected and allows the electric current to flow through the circuit being tested.
Control and deflecting coil has a current limiting resistor connected in series so as to protect the external circuit in case of damages caused due to very low resistance. Testing voltage is produced by electromagnetic induction in case of hand-operated megger and by a battery in case of electronic type megger. The deflection of pointer increases with the increases in voltage in the external circuit and also decreases with the increase in current. That is, resultant torque is inversely related to current and directly related to voltage. While the electrical circuit that is being tested is open, the resultant torque caused due to voltage coil is maximum and the deflection pointer shows the value of 'infinity' which means the circuit does not have any shorting present and resistance is the maximum within the circuit being tested. In the case of a short circuit, the deflection pointer shows 'zero' which indicates 'no' resistance in the circuit being tested.
A Megger consists of an EMF source and voltmeter. The scale of the voltmeter is calibrated in ohms (kilo-ohms or megohms, as the case may be). In measurements, the EMF of the self-contained source must be equal to that of the source used in calibration.
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