Electro-Meters: Megger AF/2 Series, Automatic Oil Test Sets


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Megger ^® 60AF/2, 80AF/2, 100AF/2 Automatic Oil Test Sets


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Characteristics:

Fully automatic microprocessorcontrolled operation
15 preprogrammed test standards plus five custom tests
User-programmable withstand (proof) test
Large backlit LCD display
High resolution to 0.1 kV
Timed and dated results printed or downloaded via RS-232 interface
Integrated printer
Quick five-minute test sequence
Choice of stirring methods
Safety interlock on high-voltage test chamber

Product Description:

The OTSAF/2 range are laboratory instruments with many advanced features. Three versions are available with maximum test voltages of 60 kV, 80 kV and 100 kV. They offer fully automatic operation plus the benefit of a built in printer to produce a hard copy of the test results and the ability to program up to five user defined tests for individual applications. The withstand test can be set to operate at any test voltage and with an initial stand time. The dot matrix liquid crystal display can also be set to read in one of six languages. An oil test vessel, configured to suit the IEC156 test specification, is supplied with the instrument.

A large, backlit, liquid crystal display shows test menus, set up screens and results. The resolution of the high voltage output is displayed to 0,1 kV. Results can be printed on the internal dot matrix printer or transferred via the RS232 interface to an external printer or PC. Printouts are automatically time and date stamped. Standard stirring with the OTSAF/2 is achieved by a magnetic stirrer bar. Additional vessels are available optionally, including one suitable for testing to the ASTM D1816 specification. This calls for stirring to be carried out by a motor driven impeller. Each test can be selected with either magnetic stirring, propeller stirring or no stirring.

General Information :

APPLICATIONS
These test sets are used to determine the dielectric strength of insulating oils used in transformers, switchgear and other electrical apparatus. This test offers a quick guide to the general state of the oil and may show if the oil is contaminated by moisture or particles. A low dielectric strength may indicate that the oil is deteriorating and requires replacement. Many specifications that detail sampling techniques, test vessel dimensions and test procedures are provided for improved results interpretation. These standards are programmed into the OTS AF/2 series to reduce operator testing time.

OPERATION
The OTSAF/2 series are programmed with a test sequence suitable for using the VCM100 called ‘CHECK CALIBRATION’. This sequence causes the output of the oil test set to ramp up from 0 kV to the maximum voltage value, pausing at each 10 kV point for 10 seconds to allow the calibration to be checked.

Other versions of Megger oil test sets (such as the OTSAF, OTS60 auto and OTS75 auto) can be used in manual mode or with a low rate of voltage rise to allow checking

Parameters of test specifications
Test Spec	Initial Stand	Rate of rise of Test Voltage	Interm. Stir Time	Interm. Stand Time	No. Of Tests
Selected	1 min.	2kV/s	30 s	30 s	3
5min test	5 min.	2kV/s	2 min. (option 1)	2 min. (option 2)	6
IEC156 etc	2 min. 20 s	3 kV/s	-	1 min.	5
ASTM D877	3 min.	0,5 kV/s	Continuous	1 min.	5
ASTM D1816	10min.	2 kV/s	1 min.	4 min.	6
UNE21	0-99 min 55s **	2 kV/s	Ramps to preselected value of 1 minute or breakdown
Withstand A	0-99 min 55s **	2 kV/s	As above and continues to breakdown or maximum value of test set
Withstand B	0-99 min 55s *	0,5-5,0 kV/s*	0-99 min 55s*	0-99 min 55s*	1-99
Custom (1-5)* BS5730a	A,B	-	2 kV/s	1 min.	1 min.

IEC156 etc. includes BS148, BS5874, VDE 0370, NFC 27, CE1344, OCT 6581, SABS555, AS1767, STA8286 and IP295.
NFC27, STAS286 and UNE21 omit the first breakdown value from the average calculation.
STAS286 has a 2 minute intermediate stand time.

Maximum Duration of Selected test sequence
	OTS60AF/2	OTS80AF/2	OTS100AF/2
5min test	4min. 30s	5min.	5min. 30s
IEC156 etc	18min.	19min.	20min.
ASTM D877	8min.	8min. 33s	9min. 7s
ASTM D1816	17min.	20 min. 20s	23 min. 40s
UNE21	38 min.	39 min	40 min.
Withstand A	Ramps to preselected value of 1 minute or breakdown
Withstand B	As above and continues to breakdown or maximum value of test set
Custom (1-5)*	-	-	-
BS5730a	Withstand test at 22 kV, 30 kV or 40 kV (depending on equipment category and electrode gap) for 60 s. If breakdown occurs another two tests are carried out, both must pass if sample is OK.

General Specifications :

High Voltage Output	OTS 60AF/2	OTS 80AF/2	OTS 100AF/2
Voltage:	60 kV maximum (30 kV - 0 - 30 kV)	80 kV maximum (40 kV - 0 - 40 kV)	100 kV maximum (50 kV - 0 - 50 kV)
Communication:	RS232C 5 pin DIN socket Five custom tests allowing; 1 to 99 tests 0,5 to 5 kV/s rate of voltage rise 0 to 99 min. 59 s stir and stand times Averaging start from first to last test
Power supply:	Four Selectable Values: 110 V, 120 V, 220 V, 240 V ±10% 50/60 Hz
Display:	Dot-matrix LCD gives alphanumeric information and kV test voltage
Resolution:	0.1 kV

Downloads:

Downloads: General Specifications

Safety
Meets the requirements of IEC1010-1 (1991) Safety interlock to BS5304 (1988) ‘Guarding of Machinery’ standard.

EMC
In Accordance with IEC61326 including Amendment No. 1

Fuses
41 kg (90 lb) approx.
2 x F6,3 A, IEC127/1, 20 x 5 mm, HBC
T2 A, IEC127/5, 20 x 5 mm, HBC for 220/240 V
T4 A, IEC127/5, 20 x 5 mm, HBC for 110/120 V

Environmental
Temperature Range

Operating:
0 to 40°C
(32 to 104°F)

Storage:
-40 to +70°C
(-40 to +158°F)

Humidity Range
Operating:
80% RH at 40°C (104°F)

Storage:
93% RH at 40°C (104°F)
95% RH at 25°C (77°F)

Physical Dimensions
19.7H x 18.3W x 12.5D in. approx.
50H x 46.4W x 31.9D Cm

Weight
90 lb (41 kg) approx.