Characteristic Comprehensive Tester is not a single-function instrument, but a general category name. It usually refers to an intelligent device that integrates multiple measurement functions and can perform one-stop comprehensive tests on multiple key electrical characteristics of the object under test (such as transformers, mutual inductors, circuit breakers, arresters, or motors).
In power preventive tests and factory tests, this type of instrument aims to replace multiple traditional single-function instruments (such as bridges, turns ratio group testers, DC resistance meters, etc.), improving on-site work efficiency and data consistency.
Depending on the application scenario, the most common "Characteristic Comprehensive Tester" mainly refers to the following categories:
1. Transformer/Mutual Inductor Characteristic Comprehensive Tester (most common)
This is the most widely used type in the power industry, mainly used for handover and preventive tests of transformers and mutual inductors.
Core function integration:
Turns ratio and group test: measures voltage ratio, phase relationship (group).
DC resistance test: measures winding DC resistance in three phases simultaneously or separately (with built-in arc suppression function).
No-load/load loss: some high-end models can measure no-load current, no-load loss, short-circuit impedance, and load loss.
Winding deformation analysis: some models integrate frequency response analysis (FRA) interface or function.
Insulation resistance/absorption ratio: some models integrate a megohmmeter function.
Advantages: multiple tests can be completed with one connection, automatic temperature conversion, automatic generation of comprehensive reports containing all parameters, avoiding errors and risks caused by repeated wiring and unwiring.
Applicable standards: GB/T 6451, DL/T 596-2025, IEC 60076.
2. High-voltage switch (circuit breaker) characteristic comprehensive tester
Specifically used for mechanical characteristic testing of high-voltage circuit breakers and GIS combined appliances.
Core function integration:
Time measurement: opening/closing time, synchronization (three-phase non-synchronism), bounce time.
Speed measurement: just-open/just-close speed, maximum speed, average speed (requires travel sensor).
Travel and overtravel: contact gap, overtravel, overshoot travel.
Operating voltage: action voltage characteristics of opening/closing coils.
Current waveform: records coil action current waveform, analyzes mechanical faults such as core jamming.
Low-voltage action test: automatically performs action reliability test at 30%-65% of rated voltage.
Advantages: high-precision time counting (0.01ms), built-in adjustable DC power supply to drive switch action, graphical display of speed-travel curve.
3. Arrester/discharge counter characteristic comprehensive tester
Core functions: measures total current, resistive current (fundamental and harmonics), power loss of metal oxide arresters (MOA), and verifies the operation of discharge counters.
Features: can be tested without power outage (live test) or with power outage, can early detect moisture or valve plate aging of arresters.
4. Motor/generator characteristic comprehensive tester
Core functions: integrates DC resistance, insulation resistance, AC withstand voltage, inter-turn impulse withstand voltage, no-load/load characteristic curve testing.
Application: factory tests of motor manufacturers, performance evaluation after repair.
