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NDB Technologies NDB-DOC-3, Руководство пользователя

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NDB Technologies NDB-DOC-3 Скачать руководство пользователя страница 7

7

N D B - D O C - 3   -   U s e r   M a n u a l

6.  Operation

This section of the user manual describe how to operate the NDB-DOC-3.

6.1  Cable check test

Perform  a  cable  check  test  prior  to  test  any  power  transformer  to  ensure  test 
equipment’s integrity.

1. 

Turn on the instrument by pressing the power button 

.

2. 

Connect the test lead to the instrument.

3. 

Short all clamps together. Make sure all clamps make good electrical contact.

4. 

Press the winding type selection button 

 to select 

MODE: CableCheck

.

5. 

Press the start test button 

.

6. 

The test will last for approximately 8 seconds.

7. 

Once completed, the result will be displayed:

• 

The green 

OK

 indicator will turn on, and 

Pass

 will be displayed on the 

screen if cables are in good condition.

• 

The 

OPEN

 yellow indicator will turn on, and 

Fail

 will be displayed on 

the screen if the instrument detected an unexpected resistance value 
in the test lead. Make sure all clamps make good electrical contact. If 
the problem persists, the test lead must be repaired or replaced. 

Содержание NDB-DOC-3

Страница 1: ...NDB TECHNOLOGIES INC NDB DOC 3 Distribution Transformer Tester MU037 GEN ENG Version 3 1 NDB DOC 3 User Manual ...

Страница 2: ... Contact Us 2 2 Safety Warnings 3 2 1 Safety Symbols 3 2 2 Safety Precautions 3 3 Kit Content 5 4 Application 6 5 Overview 6 6 Operation 7 6 1 Cable check test 7 6 2 Single phase transformer test 8 6 3 Three phase transformer test 10 6 4 Delta Transformer bank test 12 6 5 Yn Transformer bank test 14 7 Additional Information 16 7 1 Single phase transformer 16 7 2 Delta Padmounts Transformers 16 7 3...

Страница 3: ...ge symbol alerts you of the presence of an un insulated voltage with enough magnitude to produce an electric shock 2 2 Safety Precautions Do not use the NDB DOC 3 system in an area with risks of explosion Stand clear of all parts of the high voltage circuit including all connections unless the device under test is de energized Keep other people away from test activities with barricades or warnings...

Страница 4: ...ety precautions could permanently damage the instru ment cause injuries or death Even with all efforts invested in making a safe instrument it is just not pos sible to remove all potential injury or death risks regarding the use and or maintenance of this equipment Also risks of electrocution is inherent in or around high voltage environments and these risks cannot be controlled by ndb Technologie...

Страница 5: ...U s e r M a n u a l 3 Kit Content List of available items NDB DOC 3 instrument NDB DOC3 02 test leads 122 cm 48 inches ACC 103 Optional magnetic hanger strap BOX 109 Soft case MU037 User manual Calibration certificate ...

Страница 6: ... the transformer secondary windings from their loads Please note partial shorts or short shorts that only ap pear under high voltages may not always be detected by the NDB DOC 3 If used on secondary winding to perform an open winding test user must stand clear of the primary high voltage terminals while testing 5 Overview This section of the user manual describe the principal features of the NDB D...

Страница 7: ...d electrical contact 4 Press the winding type selection button to select MODE CableCheck 5 Press the start test button 6 The test will last for approximately 8 seconds 7 Once completed the result will be displayed The green OK indicator will turn on and Pass will be displayed on the screen if cables are in good condition The OPEN yellow indicator will turn on and Fail will be displayed on the scre...

Страница 8: ...elect the transformer size 5 Press the kV arrows to select the transformer s primary winding nominal voltage 6 Connect the H1 clamp to the transformer s H1 terminal 7 Connect the neutral GND clamp to the transformer s neutral or ground or H0 8 Press the start button H1 GND H1 X1 X2 N N GND H0 Cutout switch must be open The power transformer must be de energized Load Tip The secondary leads can sta...

Страница 9: ...etected an open circuit The OPEN yellow indi cator will turn on The transformer s primary winding may have an open circuit or the test clamps may have poor electrical connections In cases where high DC resistance is measured the test will last up to 2 minutes and the transformer will be considered open OK The OK green indicator will turn on The transformer s DC resistance and AC impedance measured...

Страница 10: ...nding configuration type either Delta or Yn 4 Press the kVA arrows keys to select transformer size 5 Press the kV arrows keys to select the transformer s primary winding nom inal voltage 6 Connect the four clamps to the transformer Connect H1 clamp to transformer H1 terminal Connect H2 clamp to transformer H2 terminal Connect H3 clamp to transformer H3 terminal H1 H2 H3 GND H1 Primary Secondary X1...

Страница 11: ...NDB DOC 3 detected an open circuit The OPEN yellow indi cator will turn on The transformer s primary winding may have an open circuit or the test clamps may have poor electrical connections Import ant note Detection of single winding open condition in a 3 phase delta transformer is not possible with the NDB DOC 3 In cases where high DC resistance is measured the test will last up to 2 minutes and ...

Страница 12: ...select the transformer size 5 Press the kV arrows keys to select the transformer s pri mary winding nominal voltage 6 Connect the four clamps to the transformer Connect H1 clamp to first transformer H1 terminal Connect H2 clamp to second transformer H1 terminal Connect H3 clamp to third transformer H1 terminal Connect GND clamp to neutral or ground Refer to next figure 7 Press the start button Cut...

Страница 13: ...s For detection of open winding conditions in a 3 phase delta bank operator must use the single phase operation instructions and test all 3 transformers separately In cases where high DC resistance is measured the test will last up to 2 minutes and the transformer will be considered open OK The OK green indicator will turn on The transformer s DC resistance and AC impedance measured are within ran...

Страница 14: ...ect the transformer size 5 Press the kV arrows keys to select the transformer s pri mary winding nominal voltage 6 Connect the four clamps to the transformer Connect H1 clamp to first transformer H1 terminal Connect H2 clamp to second transformer H1 terminal Connect H3 clamp to third transformer H1 terminal Connect GND clamp to neutral or ground Refer to next figure 7 Press the start button Cutout...

Страница 15: ...e transformer s primary winding may have an open circuit or the test clamps may have poor electrical connections In cases where high DC resistance is measured the test will last up to 2 minutes and the transformer will be considered open OK The OK green indicator will turn on The transformer s DC resistance and AC impedance measured are within range The transformer is con sidered in good condition...

Страница 16: ...uld enter 14kV and 25kVA The 24940V marking on the name plate re fers to when this transformer is used inside a 3 phase Yn application When used alone we can simply use the voltage rating that will be across the winding And in the case of a single transformer that is the 14400V 7 2 Delta Padmounts Transformers With delta padmounts transformers you only have a line line primary voltage rat ing As t...

Страница 17: ...mer banks we use the primary system voltages Using the name plate in the picture above In a delta bank configuration example above we would enter 2kV and 225kVA 3 x 75kVA Our test leads would connect to the de energised bushings of the transformer bank H1 test lead to H1 bushing of the of first transformer H2 test lead to H1 bushing of the 2nd transformer and H3 test lead to the H1 bushing of the ...

Страница 18: ...t attempt to charge alkaline batteries They may leak overheat create fire or explode 9 Technical Specifications Technical Specifications IP rating IK rating IP40 IK06 Operating temperature 20 C to 60 C Dimensions 17 7 x 8 9 x 4 5 cm 7 x 3 5 x 1 8 Weight 0 47 kg 1 03 lbs Power 4x AA 1 5V alkaline battery Autonomy 8h of measurement Measurement Low voltage AC and DC Nb of Channels 3 Detection Short G...

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