Transformer Comprehensive Tester

Transformer DC Resistance Turns Ratio Comprehensive Tester

Measurements of the transformer's DC resistance or voltage ratio must be made during factory acceptance testing of semi-finished and finished products, installation, major overhauls, after tap changer adjustments, handover testing, and as required by power utility preventive maintenance testing. This procedure makes it possible to check the quality of the winding junction weld and find interturn short circuits in windings. Additionally, it recognizes broken leads, detects strand breaks in multi-strand conductors, ensures correct contact at all voltage tap changer tap positions, and confirms alignment between actual and indicated tap positions. Conventional testing necessitates several wiring configurations between two instruments, which lengthens the process, reduces productivity, and seriously disrupts production deadlines.

Our firm created the MOEORW-W4670Q Transformer DC Resistance and Turns Ratio Comprehensive Tester in response to the need for quick measurement of transformer DC resistance and turns ratio. This device uses a single-wiring configuration to monitor high/low six-phase DC resistance and test turns ratios without separating cables. Touchscreen operation is available for all functions.

3.1 Direct Resistance Function Features

1. This product is suitable for testing inductive loads such as 10kV and 35kV distribution transformers, instrument transformers, motors, generators, as well as measuring wire materials, relay switch contacts, etc.

2. Features temperature conversion functionality, enabling resistance values to be converted to different temperatures per customer requirements for convenient data comparison.

3. Features discharge audible alarms, power supply overheating protection, and reverse voltage connection protection.

4. Allows direct switching of on-load tap changers during measurement; the instrument automatically refreshes data without requiring reset operations.

5 Offers 6 current ranges with automatic current range selection based on load conditions.

3.2 Transformation Ratio Function Features

1. The instrument employs a three-phase precision inverter power supply internally, eliminating harmonic interference from mains voltage during measurement for enhanced accuracy. Operation remains unaffected when powered by a generator.

2. Utilizes three-phase output voltage to accelerate testing speed. Capable of measuring phase angle, with automatic identification of connection groups 0-11. For low-voltage rectifier transformers with multiple windings, the low-voltage side requires no disconnection for measuring transformation ratio and 7.5° angle deviation.

3. Suitable for a wide range of transformers, particularly ideal for measuring Z-type transformers, rectifier transformers, grounding transformers, and electric furnace transformers.

4. Features high/low voltage reverse connection protection, transformer interturn short-circuit protection, tap changer position failure protection, and full output short-circuit protection, enhancing instrument stability.

5. After inputting rated parameters, it automatically measures transformer turns ratio, error value, and tap position. It accurately determines the exact position of tap switches, even for asymmetrical taps, supporting up to 99 tap positions.

6. Features a 7-inch high-brightness touchscreen color LCD with clear visibility under strong light. Fully touchscreen operation with seamless Chinese-English language switching.

Suitable for 10kV and 35kV distribution transformers, instrument transformers, motors, generators, and other inductive loads, as well as wire materials and relay switch contacts. It meets requirements for DC resistance and turns ratio testing during manufacturing (semi-finished and finished products), installation, major overhauls, and tap changer adjustments. It is also suitable for preventive testing and acceptance testing by power utilities, particularly for specialized transformers such as Z-type transformers, rectifier transformers, grounding transformers, and electric furnace transformers.