Table of Contents

Overview

The Instrument Transformer Calibrator serves as core testing equipment for calibrating current transformers and voltage transformers in power industries. It accomplishes comprehensive performance verification of instrument transformers both on-site and in labs. Upgraded with microcontroller intelligent technology, it realizes automatic range adjustment, abundant data display and PC data transmission, greatly improving testing efficiency and automation level compared with traditional early-generation calibrators.

Product Features

The Instrument Transformer Calibrator is mainly used to verify the technical performance of voltage transformers and current transformers both in on-site power applications and laboratory environments. To complete calibration work, this calibrator must be matched with supporting auxiliary equipment to form a complete instrument transformer calibration system.

There is a tight technical correlation between the performance parameters of the calibrator and its matched devices. Accordingly, a basic understanding of the whole calibration system is required to properly grasp and study the overall working principle of the instrument transformer calibrator.

Domestic instrument transformer calibrators have evolved through three generations:
The first generation was electromechanical calibrators, featuring cumbersome operation and complicated wiring.
The second generation adopted advanced electronic circuits for easier operation, yet manual range switching was required during measurement with limited displayed data.
The third generation is equipped with single-chip microcomputers for enhanced intelligence. Most units are fitted with communication interfaces for PC connection, greatly boosting office automation efficiency.

Instrument Transformer Calibrator Technical Specifications

Equipment Operating Environment

Category	Parameter	Specification
Ambient Conditions	Temperature	5℃ ~ 40℃
	Relative Humidity	≤80% (at 25℃)
	Altitude	≤2500m
	Power Supply Frequency	50Hz ± 0.5Hz
	Power Supply Voltage	220V ± 5V
Measurement Range	In-phase Component (%)	0.0001 ~ 200.0, Resolution: 0.0001
	Quadrature Component (minute)	0.001 ~ 700.0, Resolution: 0.001
	Impedance (Ω)	0.0001 ~ 20.0, Resolution: 0.0001
	Admittance (mS)	0.0001 ~ 20.0, Resolution: 0.0001
Basic Error	In-phase Component	ΔX = ± (X×1% + Y×1%) ± Dx (Class 1 optional)
	Quadrature Component	ΔY = ± (X×1% + Y×1%×34.48) (Class 2 optional)
	Note	“X”, “Y” — Displayed values of the instrument; “Dx, Dy” — Quantization error of the instrument, Dx=2, Dy=5
Percentage Meter	Accuracy Class	1.5 (Class 1 optional)

Working Range

Type	Rated Value	Working Range
Current	In = 5A	1% ~ 149% In
	In = 1A	5% ~ 149% In
Voltage	Un = 100V, 150V, 100V	5% ~ 149% Un
	Un = 100V/3	5% ~ 149% Un

Working Burden

Type	Burden Specification
Current	TO to TX < 0.12Ω, cosΦ=1
Voltage	a to x < 0.25VA (at 100V)

Packing List: Instrument Transformer Calibrator

No.	Item Name	Quantity	Unit	Remarks
1	Main Unit of Instrument Transformer Calibrator	1	Set	Host device
2	High-precision Test Connecting Cables	4	Pcs	For CT & VT wiring test
3	Power Supply Cord	1	Pc	AC 220V power cable
4	Complete Operation Manual (English + Chinese)	1	Copy	Detailed operation & calibration guide
5	Factory Calibration Certificate	1	Copy	Official metering calibration document
6	Portable Hard Carrying Case	1	Pc	Shockproof case for outdoor transport
7	Spare Fuse	2	Pcs	Replacement consumable

FAQ for Instrument Transformer Calibrator

Q1: What is the main purpose of the Instrument Transformer Calibrator?

A: It is used to calibrate current transformers (CT) and voltage transformers (VT), measuring ratio error, phase error, impedance and admittance for power metering & protection verification on site and in laboratories.

Q2: What working environment does this calibrator adapt to?

A: Operating temperature: 5℃~40℃, humidity below 80% (25℃), altitude less than 2500m; rated power supply: AC 220V, 50Hz.

Q3: What measurement parameters can the instrument test?

A: It can measure in-phase component, quadrature component, impedance and admittance with ultra-high resolution, covering full range transformer error testing demands.

Q4: What is the accuracy grade of this calibrator?

A: Standard accuracy class is 1.5, Class 1 is optional for higher precision calibration scenarios.

Q5: What is the applicable working range for current and voltage testing?

A: Current: 1%~149%In (5A) / 5%~149%In (1A); Voltage: 5%~149%Un for all standard VT rated voltages.

Q6: What is the rated working burden of the device?

A: Current burden: ＜0.12Ω (cosΦ=1); Voltage burden: less than 0.25VA under 100V rated voltage.

Q7: Can the instrument store test data and connect to a computer?

A: Yes. It supports data recording, and can transmit test results to PC for archiving, analysis and report generation.

Q8: Is the device portable for outdoor field calibration?

A: Yes. Equipped with a shockproof carrying case, compact structure, suitable for regular on-site power inspection and maintenance work.

Q9: Does the shipment include calibration certificate and operation manual?

A: The full package contains host, test wires, power cord, user manual, factory calibration certificate, spare fuses and transport case.

Q10: What is the basic error calculation formula of the calibrator?

A: In-phase error ΔX=±(X×1%+Y×1%)±Dx; Quadrature error ΔY=±(X×1%+Y×1%×34.48), Dx=2, Dy=5.

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