Transformer Ratio Verification Device TTR Standard Calibrator
Transformer Ratio Verification Device TTR Standard Calibrator
I. Product Overview
The Transformer Ratio & Vector Group Tester Calibration Device is a precision calibration standard developed for digital transformer testers. Compliant with GB1094.1-1996 (Power Transformers – Part 1: General) and JJG314-2010 (Measuring Voltage Transformers), it provides traceable calibration for ratio and vector group measurements.
Core Features
High-Voltage Operation
Supports calibration at 200V input voltage.
Flexible Ratio Setting
7-decade adjustment dials enable any ratio value from 1.000000 to 100,000.
Vector Group Simulation
Configures all standard connections: D/d, D/y, D/z, Y/d, Y/y, Y/z.
Passive Design
Three single-phase ratio standards combined via switches, ensuring high stability and anti-interference capability.
II. Technical Specifications
1. General Performance
| Parameter | Value |
|---|---|
| Ratio Accuracy | Class 0.005 |
| Input Voltage | 0–240 V (Ratio Calibration) 0–250 V (Vector Group Verification) |
| Ratio Range | 1.000000–100,000 |
2. Vector Group Output
| Connection | Ratio Base Values | Calculation Rule |
|---|---|---|
| Y/Y, D/D | 10, 100, 1000 | Base ratio |
| Y/D | 17.732, 173.2, 1732 | Base ratio × √3 |
| D/Y | 5.7735, 57.735, 577.35 | Base ratio ÷ √3 |
| Y/Z | 5.7735, 57.735, 577.35 | Base ratio ÷ √3 |
| D/Z | 3.3333, 33.333, 333.33 | Base ratio ÷ 3 |
Output Ratio Accuracy: ±0.05%
III. Operation Notes
Calibration Procedure
Set the vector group switch before applying voltage.
Do not modify connections or switch settings during calibration.
Voltage Limits
Max input voltage: 240 V (ratio calibration) / 250 V (vector group verification).
Maintenance Warning
Unauthorized disassembly voids warranty. Contact the manufacturer for malfunctions.
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