Electro-Meters: Megger OTS60B Series, Automatic Oil Test Sets


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Megger ^® OTS60PB Automatic Oil Test Sets


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Characteristics:

Microprocessor controlled fully automatic oil test sets
Wide choice of vessels and accessories
Portable and laboratory units
Powered by internal, rechargeable battery
Automatic laboratory set (see table opposite)
Fully automatic operation (see table opposite)
Built in printer and RS232 output
Pass/fail limit setting

Product Description:

The OTS60PB is a fully automatic, battery powered, portable oil test set. The test voltage is electronically controlled to the maximum of 60 kV. Designed for on site testing, the instrument is supplied in a rugged carrying case with a handle for ease of transportation. An internal rechargeable battery gives a large number of tests before recharging. A clear display shows a menu of test options and guides the operator through the set up programme, illustrates the correct test electrodes and gap to use, shows the progress of each test and gives the results of the test sequence. The result can be set to give either a numerical average (with standard deviation where specified) or a pass/fail message. An optional printer kit enables hard copies of results to be produced. Accessories, such as the battery charger, spare vessels, spare electrodes and a spacing gauge are located in an attached compartment. Stirring is carried out by a motor driven paddle stirrer.

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.

General Information :

APPLICATIONS

The OTS 60PB is designed specifically to determine the dielectric strength of insulating oils. The test set is lightweight for easy transport to sites of transformers, switchgear and other electrical apparatus. This portability also allows new oil to be tested at its storage facility.

The equipment follows the oil testing sequences described in many national and other specifications including:

American ............................. ASTM D877, ASTM D1816
British ................................. BS 148, BS 5730A, BS 5874
International ..........................IEC 156
German ............................... VDE 0370
French ..................................NFC 27
Spanish ................................UNE 21
Italian ...................................CEI 344
Russian ............................... ROCT 6581
South African ....................... SABS 555
Australian ............................ AS 1767
Institute of Petroleum ............ IP 295 The OTS 60PB’s many safety features ensure the safety of the operator provided the equipment is used in accordance with the instruction manual.

Foremost among these features is the safety interlock on the test chamber door. If the test chamber door is opened during the test sequence, the high voltage will be removed and the test will terminate automatically.

BENEFITS

Lightweight and portable for ease of transport
Four test vessels and all accessories included with the test set
Operator tasks reduced by microprocessor-controlled test sequences
National and international test specifications selectable from menu
Recall of individual test breakdown voltages, automatic averaging of results and calculation of standard deviation, where specified, eliminate manual calculations and reduce chance for errors.
Built-in motorized stirrer simplifies tests requiring this function.
Internal rechargeable battery for unrestricted test location
Five-minute test program and proof test capabilities
Go/no go screen selectable for preset pass/fail limit

Parameters of test specifications
Test Spec Selected	Initial Stand	Rate of rise of Test Voltage	Interm. Stir Time	Interm. Stand Time	No. Of Tests	Max. Duration
5min test	1 min.	2kV/s	30 s	30 s	3	4min. 30s
IEC156 etc	5 min.	2kV/s	2 min. (option 1)	2 min. (option 2)	6	18min.
ASTM D877	2 min. 20 s	3 kV/s	-	1 min.	5	8min.
ASTM D1816	3 min.	0,5 kV/s	Continuous	1 min.	5	17min.
UNE21	10min.	2 kV/s	1 min.	4 min.	6	38 min
Withstand A	0-99 min 55s **	2 kV/s	Ramps to preselected value of 1 minute or breakdown
Withstand B	0-99 min 55s **	2 kV/s	As above and continues to breakdown or maximum value of test set
Custom (1-5)*	0-99 min 55s *	0,5-5,0 kV/s*	0-99 min 55s*	0-99 min 55s*	1-99	-
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.

General Specifications :

High Voltage Output
Voltage:	60 kV maximum (30 kV - 0 - 30 kV)
Resolution:	1 kV
Test Frequency:	61.8 Hz
Communication:	RS232 output plus optional printer kit Includes battery charger and four test vessels Option to set pass/fail breakdown values:
Power supply:	Internal, rechargeable 12 V, 12 Ah battery (giving typically 12 hours continuous use) Charger supply 85 to 265 V, 50/60 Hz Optional 12 V supply lead enables operation from vehicle cigarette lighter socket
Display:	Dot-matrix LCD screen gives alphanumeric information and kV test voltage to two digits
Measurement Accuracy:	2% +/- 3 digits

Downloads:

Downloads: General Specifications

Safety
Designed to incorporate where appropriate IEC1010-1, safety class I. Safety interlock to BS5304 (1988) ‘Guarding of Machinery’ standard.

EMC
In Accordance with IEC61326 including Amendment No. 1

Fuses
19 kg (42 lb) without accessories
2 x F6,3 A, IEC127/1, 20 mm x 5 mm, HBC

Environmental
Temperature Range

Operating:
0°C to 40°C

Storage:
-30°C to +65°C

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
10.2 x 14.7 x 9.75 D in.
259 x 373W x 247 D mm

Weight
42 lb (19 kg) basic.