TheUHV-300 CT PT Volt-ampere Characteristic Analyzeris essential for protection relay testing, substation maintenance, and transformer diagnostics. Its ability to automatically generate excitation curves, ratio errors, and winding resistance makes it a powerful tool for ensuring grid reliability.

Key Features

1、Comprehensive Testing Capabilities

CT Testing: Excitation characteristics, ratio, polarity, winding resistance, burden, and saturation analysis.

PT Testing: Volt-ampere (V-I) curves, excitation current, accuracy verification.

2、High-Precision Measurements

Measures excitation current, knee-point voltage, turns ratio, and phase error.

Supports 5A/1A CTs and PTs with multiple voltage ranges.

3、Built-in Power Supply & Auto Testing

Integrated variable voltage/current source (up to 300V or higher, depending on model).

Automatic test sequence for quick and efficient analysis.

4、Graphical Display & Data Storage

LCD touchscreen for real-time V-I curve plotting.

Stores test results for comparison and reporting.

5、Portable & User-Friendly

Lightweight design for field use.

Supports USB/Bluetooth for data transfer and PC software integration.

Typical Applications

1、CT/PT Verification – Ensures compliance with IEC 60044, IEEE C57.13, and other standards.

2、Saturation Testing – Determines the knee-point voltage and excitation characteristics.

3、Fault Diagnosis – Detects short-circuited turns, open circuits, or core degradation.

4、Commissioning & Maintenance – Validates transformer performance before and after installation.

How It Works

1、Excitation Test (V-I Curve)

Applies increasing voltage to the CT/PT secondary and records excitation current.

Plots the magnetization curve to identify knee-point voltage (Vk).

2、Ratio & Polarity Test

Injects a test current into the primary and measures secondary output to verify turns ratio & polarity.

3、Winding Resistance Test

Uses 4-wire Kelvin method for accurate resistance measurement of windings.

4、Burden Test

Checks the actual load connected to the CT/PT secondary.

Advantages Over Traditional Methods

1、Faster & Safer – No need for manual voltage injection or separate meters.

2、More Accurate – Digital processing eliminates human error in curve plotting.

3、Comprehensive Reporting – Generates test certificates for compliance.

Safety Considerations

1、De-energize CT/PT before testing.

2、Ensure proper grounding.

3、Follow manufacturer’s test limits to avoid overheating.