Transformer Ratio Verification Device TTR Standard Calibrator

HZBB-IV 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:...

HZBB-IV Transformer Ratio Verification Device TTR Standard Calibrator

I. Product Overview

The Transformer Ratio & Vector Group Tester Calibration Device is a precision calibration standard developed specifically for digital transformer testers. Compliant with GB 1094.1-1996 (Power Transformers – Part 1: General) and JJG 314-2010 (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