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MG500-en-GB_v1.3   3/17

 

12 

Transformer Testing 

Transformer tests are performed with the transformer completely disconnected from the line 

and the load. Note that the case ground should not be removed. 

 

The five tests listed below will completely test a single-phase transformer. Note that at least 1 

minute should be allowed between each test. 

 

1.

 

High voltage winding to low voltage 

winding and ground 

2.

 

Low voltage winding to high voltage 

winding and ground 

3.

 

High voltage winding to low voltage 

winding (pictured at right) 

4.

 

High voltage winding to ground 

5.

 

Low voltage winding to ground 

 

 

Notes on Measuring the Resistance of a Contactor or Circuit breaker 

A Contactor or Circuit breaker must provide a low resistance path to electricity when closed but 

should provide a high resistance when open.  As they age, their characteristics may deteriorate 

because of heavy use, operation in a dirty environment, or other factors. 

Unusual Insulation Resistance Measurement Applications  

o

 

Special paint or varnish may be used as an insulator on transformers and other electrical 

applications 

o

 

Insulating blankets, suits and gloves can also be tested 

 
 

Connect the  
GREEN lead here 

Connect the 
RED lead here 

Shop for Extech products at:

1.800.561.8187

ShopExtech

.ca

Содержание MG500

Страница 1: ...USER MANUAL 10KV Digital High Voltage Insulation Tester Model MG500 Shop for Extech products at 1 800 561 8187 ShopExtech ca ...

Страница 2: ... either power system grounding during periods of lightning activity or any non insulated system or non insulated circuit In the event that lightning occurs stop all testing and isolate and remove any temporarily installed test spikes or test leads Preparations for testing power system grounding or close to it can leave personnel vulnerable to exposure caused by faults at or fed from the system und...

Страница 3: ...High Voltage Digital Insulation Meter This instrument must only be used and operated by competent trained personnel and in strict accordance with the instructions and safety practices Liability is not accepted for any damage or injury caused by misuse or non compliance with instructions and safety procedures This instrument must not be used on live circuits Ensure all circuits are de energized bef...

Страница 4: ...by the tester upon completion of a test The discharge can be observed on the instrument s bargraph display Automatic Battery Test When the instrument is first powered ON a test circuit applies a heavy current draw on the batteries for a few seconds and measures the voltage in order to determine the capacity of the batteries The result is shown on the display Normal Operation Mode Considerations Th...

Страница 5: ...oltage preset button 6 Power OFF button 7 Voltage adjustment button 8 5KV test voltage preset button 9 TEST START STOP button 10 2 5KV test voltage preset button 11 500V test voltage adjust button 12 Power ON button 13 1KV test voltage preset button Note Battery compartment located on bottom of instrument and test lead compartment located behind the upper faceplate Shop for Extech products at 1 80...

Страница 6: ...en test jack on the meter Optional Leakage guard Connect the optional Blue Leakage guard test lead to the Blue test jack NOTE The Blue Leakage guard lead is attached directly to the top of the Blue guard lead of the Red test lead Connecting the Test Leads to the device under test Warning make sure that the circuit under test is de energized o Connect the Green Earth lead to the Earth or ground sid...

Страница 7: ...uard cable to the blue socket on the meter Connect the service end of the Red cable to other side of the insulator under test If a Leakage Guard lead is required to collect surface leakage connect the separate Blue test lead into the Blue guard lead from the Red test lead which is plugged into the Blue test socket on the meter and then clip the service end of the cable to the surface of the insula...

Страница 8: ...eter and then to the Ground side of the insulator under test Connect the Red lead to the Red test socket on the meter and the Blue guard cable to the blue socket on the meter Connect the service end of the Red cable to other side of the insulator under test If a Leakage Guard lead is required to collect surface leakage connect the separate Blue test lead into the Blue guard lead from the Red test ...

Страница 9: ...ther an insulating material under test will break down in a given amount of time Manual Test STOP To stop a test in progress press the TEST button The test will immediately end and the system will automatically discharge Automatic Test STOP When in the default EnersaveTM mode the test automatically stops in 5 seconds When not in the EnersaveTM mode the test automatically stops after approx 10 minu...

Страница 10: ...ain switch If the main switch is opened and the motor has a motor starter then the starter must be held in the ON position With the main switch opened the measured resistance will include the resistance of the motor wire and all of the other components between the motor and the main switch If a weakness is indicated the motor and other components should be checked individually If the motor is disc...

Страница 11: ...d to the grounded motor housing This also applies to DC Generators Testing Single Conductor Cables 1 Completely disconnect the cable under test from its source and destination 2 Connect the test leads to the cable as shown at right Testing Multi Conductor Cables 1 Completely disconnect the cable under test from its source and destination 2 Refer to the diagrams below for three possible tests Core ...

Страница 12: ...igh voltage winding to ground 5 Low voltage winding to ground Notes on Measuring the Resistance of a Contactor or Circuit breaker A Contactor or Circuit breaker must provide a low resistance path to electricity when closed but should provide a high resistance when open As they age their characteristics may deteriorate because of heavy use operation in a dirty environment or other factors Unusual I...

Страница 13: ...he total resistance is high Should the total resistance not be high enough the contaminants should be removed or the insulator replaced Test the dirty insulator for proper resistance by testing with the optional guard lead Note If cleaning the insulator is possible follow the procedure of the manufacturer DIRTY INSULATOR ELECTRICAL EQUIVALENT CIRCUIT DIRTY INSULATOR TYPICAL TEST Notes Resistance a...

Страница 14: ...tore where the batteries were purchased or wherever batteries are sold Disposal Do not dispose of this instrument in household waste The user is obligated to take end of life devices to a designated collection point for the disposal of electrical and electronic equipment Other Battery Safety Reminders o Never dispose of batteries in a fire Batteries may explode or leak o Never mix battery types Al...

Страница 15: ... stop or upon completion of test External Voltage Alert Warning of external voltage presence 500VAC or VDC Low battery indicator Replace battery displayed when battery voltage is low Power source Eight 1 5V C Alkaline cells Battery life 40 hours no load at 10kV Auto Power off After 10 minutes of inactivity EnersaveTM mode Shorter test time 10 seconds to conserves battery energy Test Leads silicone...

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