Transformer Volt-Ampere Characteristic Tester Fully Automatic CT Current PT Voltage Transformer Ratio Polarity Comprehensive Test
The keywords you entered, such as "Transformer Volt-Ampere Characteristic Tester" and "Fully Automatic CT/PT Ratio Polarity Comprehensive Test," precisely point to the core professional equipment used in power systems for relay protection and high-voltage insulation testing - the Transformer Characteristic Comprehensive Tester.
Combining mainstream industry technology and standards, here is a summary of the core functions, technical features, and operating specifications of this type of fully automatic comprehensive tester:
1. Core Test Functions (Multi-function in One)
This device integrates multiple test modules, comprehensively covering the commissioning and preventive tests for Current Transformers (CT) and Voltage Transformers (PT):
Volt-Ampere Characteristic (Excitation Characteristic) Test: Automatically plots the volt-ampere characteristic curve of CT/PT, automatically calculates and provides the knee point voltage/current values, as well as the 5% and 10% error curves.
Ratio and Polarity Test: Automatically measures the ratio and polarity of CT/PT, and calculates result parameters such as ratio error and phase error.
Secondary Circuit Inspection and Withstand Voltage: Supports CT/PT secondary winding resistance measurement, secondary load test, secondary AC withstand voltage test, and automatic core demagnetization.
2. Fully Automatic and Intelligent Features
Fully Automatic Test: Only need to set the maximum test voltage, maximum current, and step size on the screen, and the device will automatically increase voltage/current from zero step by step. The entire process automatically records data and plots curves, completely eliminating the tedious manual work of traditional voltage regulation, manual recording, and curve plotting.
Safety Isolation: Adopts a fully computerized device. After setting parameters, there is no need for manual contact with the equipment under test, keeping test personnel away from high-voltage circuits and greatly enhancing personal safety.
Data Management and Reports: Built-in large-capacity memory (data not lost on power failure), with a built-in micro printer for on-site printing of curves and data. Supports USB flash drive transfer or connection to a computer via RS232/USB interface, using host computer software to generate complete test reports in Word/Excel format.
3. Key Operating and Safety Specifications
In actual field testing, the following specifications must be strictly followed:
Disconnect Ground Wire: When performing CT ratio and polarity tests, be sure to disconnect the ground wire of the CT secondary winding first to avoid damaging the device or preventing the test from proceeding.
Short-circuit Secondary Windings: When performing CT ratio tests, all other secondary windings not involved in the test should be short-circuited.
Prevent Ground Points: When performing CT/PT volt-ampere characteristic, ratio, and withstand voltage tests, there must be absolutely no ground points in the output circuit.
Safety Distance: When performing PT volt-ampere characteristic tests, ensure sufficient electrical safety distance for the primary winding.
4. Reference for Mainstream Technical Parameters
Output Voltage and Current: The maximum output voltage for single-unit volt-ampere characteristic testing is typically 0-1000V or 2500V; the maximum output current for ratio testing can reach 0-600A.
Test Accuracy: For high-precision equipment, the volt-ampere characteristic test accuracy is typically ≤0.5%, and the ratio accuracy is ≤1.0% (some high-end variable frequency devices can achieve ±0.05%).
Power Supply Mode: Supports AC220V single power input, and some models support AC220V/380V adaptive power supply.
💡 Further Assistance
The Transformer Comprehensive Tester is key equipment for ensuring the accuracy of power grid metering and relay protection. May I ask what your specific needs are currently:
Product Selection and Parameter Verification: Do you need me to help you confirm whether the single-unit output voltage meets the requirements based on the voltage level (e.g., 500kV) and capacity of the on-site transformer, or whether an external booster needs to be selected?
On-site Wiring and Practical Operation Guidance: Do you need to understand the specific wiring diagram for CT ratio testing, or the criteria for determining the knee point voltage in volt-ampere characteristic testing?
Fault Troubleshooting and Data Analysis: Have you encountered anomalies during testing (such as inability to increase voltage, curve distortion), and need assistance in analyzing whether it is a wiring error or a defect in the transformer itself?
