Megger TTR20-1 & TTR25-1 Handheld Transformer Turns Ratio Tester: 10,000:1 or 20,000:1 Range

Description

The Megger TTR20-1 & TTR25-1 Handheld Transformer Turns Ratio Testers are automatic, battery-operated, lightweight transformer turns ratio test sets that support simple, single-button, one-handed operation. They are designed for measuring the turns ratio, excitation current, and polarity of windings in single- and three-phase distribution and power transformers (tested phase by phase), potential and current transformers, and tapped transformers.

Measurement

Both models measure turns ratio to an accuracy of ±0.2% (0.8 to 4000). However, the Megger TTR20-1 differs from the Megger TTR25-1 in regards to its range:

TTR20-1 turns ratio range: 10 000:1
TTR25-1 turns ratio range: 20 000:1

Additionally, the Megger TTR20-1 & TTR25-1 Handheld Transformer Turns Ratio Testers can record ratio and phase errors for brushing CTs to an accuracy of ±0.2% nameplate, reducing the need for heavy test equipment and decreasing the test time. They are ideal for determining the no-load accuracy of most CTs and PTs and can be used to identify potentially faulty CTs and PTs, making them perfect for conducting inspections in meter shops.

Ergonomic Design

Measurements are displayed on the easy-to-read, high-contrast, backlit LCD. Housed in an extra-rugged, high-impact, shock-resistant case with metal connectors, these lightweight (870g) turns ratio test sets are compact ensuring they support single-handed operation which significantly reduces test time and eliminates the need to kneel or bend down to operate the instrument. Finally, the Megger TTR20-1 & TTR25-1 Handheld Transformer Turns Ratio Testers are powered by six easily replaceable AA alkaline batteries that deliver twelve hours of operating time.

Ready to use straight out of the box, the Megger TTR20-1 & TTR25-1 Handheld Transformer Turns Ratio Testers are ideal for use in substations, transformer-manufacturing factories, and meter shops.

Megger TTR20-1 & TTR25-1 Handheld Transformer Turns Ratio Tester Key Features

Automatic, battery-operated, lightweight transformer turns ratio test sets
Support single-hand, one-button operation
Measure the turns ratio, excitation current and polarity of windings in single- and three-phase distribution and power transformers (tested phase by phase), potential and current transformers, and tapped transformers
Turns ratio accuracy: ±2% (0.8 to 4000)
TTR20-1 turns ratio range: 10 000:1
TTR25-1 turns ratio range: 20 000:1
Records ratio and phase errors for brushing CTs to an accuracy of ±2% nameplate
Determine the no-load accuracy of most CTs and PTs
Identify potentially faulty CTs and PTs
Easy-to-read, high-contrast, backlit LCD
Extra-rugged, high-impact, shock-resistant case with metal connectors
Lightweight (870g)
Powered by six AA alkaline batteries
Operating time: 12 hours
Ideal for use in substations, transformer-manufacturing factories, and meter shops

What’s Included?

Your Choice of Megger TTR20-1 OR TTR25-1 Handheld Transformer Turns Ratio Tester
Combined Test Leads (1.8m/6ft and X/H Winding)
Instruction Manual
Electronic Documents (TTR25-1 ONLY)

Tech Specs

Megger TTR20-1 & TTR25-1 Handheld Transformer Turns Ratio Tester Technical Specifications

	TTR20-1	TTR25-1
Type of Power	Six standard “AA” (IEC LR-6) alkaline batteries
Battery Life	Up to 12 hours of field operation
Excitation Voltage	8 V rms for testing distribution or power transformers and PTs; 0.5, 1.5, or 8 V ac rms for testing CTs
Test Frequency	55 Hz internally generated providing a universal 50/60 Hz test set
Excitation Current Range	0 to 100 mA, 4-digit resolution
Turns Ratio Range	0.8 to 10,000, 5 digit resolution	0.8 to 20,000, 5 digit resolution
Transformer Polarity	Normal or reversed
Current (rms) Accuracy	±5% rdg ±0.5 mA
Turns Ratio Accuracy*	±0.20% (0.8 to 4,000)	0.20% (0.8 to 4,000)
	±0.25% (4,001 to 10,000)	0.25% (4,001 to 10,000)
	-	0.30% (10,001 to 20,000)
	*For Excitation Current Values no greater than preset value.
Display Full Graphics	LCD module, adjustable back-lighting, wide temperature range, 128 x 64 dots (21 characters by 8 lines)
Safety/EMC/Vibration	Meets the requirements of IEC-1010-1, CE and ASTM D999.75
Temperature Range	Operating: -20º C to 55º C (-5º F to 130º F)
	Storage: -50º C to 60º C (-55º F to 140º F)
Relative Humidity	Operating: 0 to 90% non-condensing
	Storage: 0 to 95% non-condensing
Protective Devices	High voltage side shorting relay, transient voltage suppressors and gas surge voltage protectors
Measuring Time	Less than 5 seconds
Measurement Method	ANSI/IEEE C57.12.90 and IEC 600076.1 (2000)
Dimensions	240 H x 115 W x 50 D mm (9.5 H x 4.5 W x 1.9 D in.)
Weight	Approximately 1.3 kg (2.8 lb), including leads

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