The Vanguard Instruments WRM-40 is a microprocessor-based micro-ohmmeter specifically designed for measuring the winding resistance of large power transformers. It offers a range of advanced features and capabilities that make it an ideal tool for both routine maintenance and troubleshooting applications.
High-Current Output: The WRM-40 delivers a maximum test current of 40 amperes, enabling it to quickly provide stable and accurate resistance readings even for large transformers with low winding resistances.
Dual-Channel Operation:Â The instrument features two independent resistance-reading channels, allowing simultaneous measurement of two transformer windings in a single test cycle. This significantly reduces testing time and improves efficiency.
Four-Wire Kelvin Connections: The WRM-40 employs four-wire Kelvin connections to eliminate lead resistance errors and ensure high measurement accuracy. This technique is particularly beneficial for measuring low-resistance windings with long test leads.
Built-in Thermal Printer:Â The instrument incorporates a built-in 2.5-inch wide thermal printer for generating on-site test reports. This feature eliminates the need for external printing equipment and provides convenient documentation of test results.
Computer Interface: The WRM-40 provides a computer interface for transferring test data to a PC or laptop. This allows for further analysis and data archiving.
Auto Discharge Circuit: For enhanced safety, the WRM-40 incorporates an automatic discharge circuit that safely dissipates stored energy in the transformer core after each test. This feature protects both the operator and the equipment.
Wide Measurement Range: The WRM-40 offers a wide measurement range of 1 micro-ohm to 500 ohms, making it suitable for measuring a variety of transformer types and sizes.
Compact and Portable Design: Despite its capabilities, the WRM-40 is compact and portable, weighing less than 30 pounds. This makes it easy to transport and use in various field environments.
The Vanguard Instruments WRM-40 is widely used in various applications, including:
Routine Maintenance: Regular resistance measurements of transformer windings are crucial for preventive maintenance programs. The WRM-40 is an ideal tool for detecting early signs of winding damage or deterioration.
Troubleshooting: Fault isolation and troubleshooting of transformer problems often involve measuring winding resistance. The WRM-40 can quickly provide accurate readings to help identify and localize faults.
Predictive Maintenance: Predictive maintenance strategies rely on monitoring transformer parameters over time to predict potential problems. The WRM-40 is a valuable tool for collecting resistance data that can be analyzed to identify trends and predict future issues.
