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G-TEST

接地電阻測試器

使用手冊

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Содержание G-TEST

Страница 1: ...G TEST 接地電阻測試器使用手冊 ...

Страница 2: ...33 G TEST Microprocessor Controlled Digital Earth Tester User s Guide ...

Страница 3: ...urement ___________________________________ 41 5 1 Observations about grounding diffusion systems GDS ________________ 42 6 Spurious voltages measurement ______________________________________ 43 7 Soil resistivity measurement _________________________________________ 44 8 Abnormalities indications on the display ________________________________ 46 8 1 Excessively high spurious voltages __________...

Страница 4: ... and will show the results on the display In order to conveniently test earth systems the G TEST allows measure ments using test currents with selectable frequency of 270Hz or 1470Hz Measurements in the 270Hz frequency allow to analyse the system behav iour when in contact with fault currents of industrial frequency while those in the 1470Hz frequency show better the system behaviour when in conta...

Страница 5: ...sily accessible by the operator The following graphics show the function of each one of the equipment s items 1 1 1 Connections and items H S ES E Output terminal E Output terminal ES Output terminal S Output terminal H Alphanumeric display Keyboard RS 232 communication port Power supply input Paper feed control ...

Страница 6: ...1 Selects 1470Hz frequency 2 Selects the resistance measurement function 3 and 4 Increase or decrease the specified distance between rods in a progression of 1 2 4 8 16 or 32 meters It also allows the operator to select the Rx function used to check the equipment calibration by using a standard resistance ignoring the distance parameter not needed in this function 5 and 6 Increase or decrease the ...

Страница 7: ...ating The voltmeter is selected The resistivity measurement function is selected A measurement is running 1 2 Measurement ranges The G TEST automatically selects an adequate range when operating allowing measurements between 0 01Ω and 20kΩ resistance 0 01Ωm and 50kΩm resistivity or voltages between 0 and 60V when in the volt meter function ...

Страница 8: ...ways active even if the G TEST is off Recharge procedure Check if the G TEST is off and then connect it to the power supply The battery charger LED will turn red and will remain so until the battery is to tally recharged Then the light will turn to green and will stay on until the equipment is disconnected from the power supply If the equipment is turned on during the recharge procedure the displa...

Страница 9: ... test the equipment calibration The resistance must be connected to the G TEST as shown below RX H S ES E After connecting the resistance follow these procedures Turn the G TEST on Select the resistivity function In the distance standard resistance selection function choose Rx nomi nal standard resistance Press the START7 key After 5 seconds a stable value close to the standard resistance s nomina...

Страница 10: ... the cables supplied with the equipment connect the rods to the H and S output terminals respectively The grounding system under test must be connected to E with the 5 meter cable E3 E2 E1 fig 01 D1 D2 40m cable 20m cable 5m cable Current rod Voltage rod Ground to be measured H S ES E Press the START7 key to start the test The test number will be shown on the display followed by the message WAIT a...

Страница 11: ...iate compliance of this condition must be checked by carrying out three successive measurements of the GDS resistance keeping the current rod in position but moving the voltage rod about 2 meters between measurements L M and N points in the image below If all three meas urements show the same result within the earth meter specified error mar gins the measurement should be considered correct Otherw...

Страница 12: ...il the condition Technical literature describes alternative methods that make it possible to reduce those distances with valid results Note all these observations refer to physical aspects essential to the measurement process being applied to all earth meters regardless of manufacturer or technology 6 Spurious voltages measurement In order to check the existance and measure eventual parasitic curr...

Страница 13: ...tivity since this value is part of the calculation Specify the distance between rods a in the image below and on the display by using the 3 and 4 keys 5 and 6 to increase or decrease only one meter at a time fig 02 a H S ES E a a H S ES E Press the START7 key The G TEST will automatically apply Wenner s equation below based on collected data 4 Ra a 4 p 2 2 a 1 a p 2 2 Legend ρ soil resistivity val...

Страница 14: ...10 000m it is recommended to perform measurements in at least five points arranged as shown in the image below Two sets of measurements should be needed for the central point a b a 4 D a 2 b 2 b 4 a 4 B E A b 4 C Measurements points A B C D E Direction of measurements x y y x Larger areas can be divided in areas of 10 000m each In the case of dif ferent forms limiting the area in smaller rectangle...

Страница 15: ...oo high 8 2 Excessively high earth resistance If the system s resistance is exceptionally high above 20 00 kΩ and therefore beyond the equipment range the following message will appear upper line R 20 00k 3_Pole 270Hz 8 3 Excessively high resistance in the auxiliary rods If by any reason there is no current between H and E or if resistance on the H pole is too high the display will show Check H_po...

Страница 16: ...mputer To transfer data from the G TEST memory to a computer use the commu nications cable supplied with the accessories to connect the equipment and the computer s RS 232 ports At Windows START menu select Programs Accessories Communica tion and start the Hyper Terminal To create a new connection choose a name and an icon and click OK On the next window select the correct COM port After clicking ...

Страница 17: ...maged White side Yellow side This printer uses 37mm wide thermal paper which comes in a 33mm diammeter reel The figure shown below indicates how to insert paper Press key until the paper appears To remove the old paper reel cut the paper next to it and press key The removal used reel operation must be carried out in this way due to the fact that the paper movement is in one way only that is the pa...

Страница 18: ...that current and the voltage developed in the soil The operator should inform the distance between spikes and the equipment automatically compute soil resistivity The display shows resis tivity value computed with Wenner full equation Voltmeter In the voltmeter function the equipment operates as a CA conventional voltmeter making it possible to measure voltages generated by parasitic cur rents Mea...

Страница 19: ...xternal serial printer computer or data logger Built in printer For a printed register document of measured val ues Power supply By means of an internal rechargeable battery 12 V 2 3 Ah Battery charger A smart microprocessor controlled circuit that adjusts the battery charge to the optimised pa rameters in order to ensure highest service life Power supply 220 240 V 50 Hz Safety Class It meets the ...

Страница 20: ...pply cable RS 232 cable One 40 meters cable in red colour Two 20 meters cable in blue and green colour One 5 meters cable in black colour One 5 meters cable to connect to the grounding system to be measured Canvas bag This User s guide MARK Technical modifications reserved ...

Страница 21: ...52 Notes ...

Страница 22: ...53 Notes ...

Страница 23: ...54 Notes ...

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