CT/PT Measurement And Analysis

Looking for a certified B2B manufacturer of CT PT Analyzers and current transformer testing systems? Weshine manufactures high-precision, portable Current Transformer Analyzers and CT PT test equipment for power utilities, transformer factories, and high-voltage testing laboratories. Effortlessly measure excitation curves, turns ratio, polarity, phase error, winding resistance, and secondary burden in compliance with IEC 61869 and IEEE C57.13 standards. Direct factory pricing and OEM/ODM options available.

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CT PT Analyzer & Instrument Transformer Test Systems for HV Power Grids

Accurate current and voltage measurement is vital for power grid protection, revenue metering, and substation automation. As a dedicated Electrical Testing Equipment Supplier, Weshine provides state-of-the-art CT PT test equipment and multi-functional Current Transformer Analyzers designed to evaluate protection and metering class instrument transformers in both field and factory environments.

Deploying an automated instrument transformer test system allows test engineers to quickly measure excitation characteristics, knee-point voltage, ratio error, phase displacement, winding resistance, and secondary loop burden. Utilizing low-voltage variable-frequency testing methods, our CT PT Testers deliver lab-grade accuracy without requiring bulky high-voltage equipment, drastically improving site safety and operational efficiency.

Comprehensive Test Capabilities for Instrument Transformers

Our current transformer testing system line supports complete parameter diagnostics across a wide array of high-voltage and medium-voltage assets:

• Protection & Metering CTs: Measures knee-point voltage, ratio error, phase error, ALF/FS, and excitation curves for core classes 5P, 10P, TPX, TPY, TPZ, and 0.2S high-accuracy metering cores.

• Potential / Voltage Transformers (PT/VT): Evaluates ratio, polarity, phase angle error, and excitation on electromagnetic VTs and capacitive voltage transformers (CVT).

• Bushing & GIS CTs: Fast multi-tap testing for CTs installed inside power transformers, circuit breakers, and Gas Insulated Switchgear (GIS).

• Secondary Loop & Burden Diagnostics: Direct evaluation of secondary wiring impedance, protection relay loop resistance, and connected burden.

Why Invest in an Automated CT PT Tester?

Integrating a high-precision CT PT Analyzer into your substation commissioning or manufacturing quality control workflow yields distinct technical and economic advantages:

Prevent Protection Maloperation & Metering Errors

Detects critical wiring and core defects before energization:

• Reversed CT/PT polarity leading to false differential relay trips.

• Knee-point voltage degradation causing core saturation during short-circuit faults.

• Ratio errors exceeding guaranteed class limits, impacting billing accuracy.

• High secondary burden causing signal distortion at protection terminals.

Maximize Field Safety & Portability

Modern variable-frequency CT PT Testers apply safe, low AC voltages (e.g., < 200V) to automatically extrapolate knee-point voltages up to 40kV, eliminating dangerous high-voltage hazards in switchyards.

Streamline Testing Time

An automated current transformer testing system performs all standard tests (ratio, excitation, resistance, burden) in a single wiring setup, cutting testing time per core from hours to under two minutes.

Featured CT/PT Measurement & Analysis Hardware

Weshine provides compact, portable instrument transformer testers built for rugged outdoor field conditions and factory test bays:

• Transformer Test Equipment — Explore our parent category for complete transformer and instrument transformer testing solutions.

Key Applications

Our CT PT test equipment is deployed across critical power grid and industrial sectors:

Instrument Transformer & Switchgear Manufacturers

• Factory Acceptance Testing (FAT): Automated batch verification of excitation curves, ratio errors, and phase displacement before equipment leaves the factory floor.

• Quality Control & Class Verification: Certifying protection and metering cores against guaranteed IEC/IEEE accuracy classes.

Power Utilities & Grid Operators

• Substation Commissioning: Establishing baseline accuracy, polarity, and secondary wiring integrity before energizing new bays.

• Preventive Maintenance & Overhauls: Diagnostic health checks of aging CTs/PTs during routine substation maintenance cycles.

Independent Testing & Calibration Laboratories

• Diagnostic Condition Assessment: High-precision calibration, type testing, and post-fault diagnostic analysis.

Key Features of Our CT PT Analyzers

• One-Click Automatic Testing: Simultaneously measures excitation curves, knee-point voltage/current, ratio error, phase displacement, winding resistance, burden, and polarity.

• Smart Low-Voltage Testing Principle: Uses low excitation voltage to safely extrapolate saturation parameters according to IEC 60044-1/6, IEC 61869-2/3, and IEEE C57.13 guidelines.

• Integrated Demagnetization: Automatically demagnetizes the iron core after excitation tests to eliminate residual flux errors.

• Multi-Tap CT Testing: Easily measures multi-ratio CTs without manual wiring changes.

• Onboard Storage & PC Software: Generates customized PDF test reports, displays graphical excitation curves, and supports USB data transfer for seamless digital asset logging.

Standards Compliance & Accuracy Standards

All Weshine Current Transformer Analyzers and instrument transformer test systems meet strict global testing specifications:

Standard / Guideline	Application & Technical Scope
IEC 61869-2	Instrument transformers – Specific requirements for current transformers
IEC 61869-3	Instrument transformers – Specific requirements for inductive voltage transformers
IEEE C57.13	Standard requirements for instrument transformers
ANSI / NEMA	Guidelines for metering and protection class instrument transformer testing

How to Choose the Right CT PT Tester

Selecting the ideal CT PT test equipment depends on your testing environment, core types, and required measurement accuracy:

1. Based on Portability & Field Requirements

For substation field technicians, select a lightweight (< 10 kg) CT PT Analyzer using low-voltage variable frequency technology. These units replace heavy voltage boosters, allowing single-person operation across large switchyards.

2. Based on Core Complexity (Transient & Protection Cores)

If your grid uses transient protection cores (TPX, TPY, TPZ) or high-accuracy metering CTs (0.1 / 0.2S class), ensure the Current Transformer Analyzer supports dynamic ALF (Accuracy Limit Factor), FS (Instrument Security Factor), and Ts (Secondary Time Constant) calculations.

3. Based on Data Integration & Reporting

Look for intuitive PC software that supports automatic pass/fail evaluation based on selected IEC/IEEE standards and allows fast report generation for utility acceptance sign-offs.

Why Choose Weshine as Your B2B Equipment Supplier?

Weshine is a premier Chinese manufacturer of power diagnostic instruments:

• Direct Factory Pricing & B2B Wholesale: Cost-effective supply with flexible OEM/ODM options for global test equipment distributors and utilities.

• Complete High-Voltage Diagnostics Portfolio: Combine CT PT analyzers with TTR meters, winding resistance testers, AC Hipot sets, and oil test equipment.

• Comprehensive Engineering Support: Backed by factory calibration certificates, technical consultation, and global operator training.

Related Testing Solutions

Complete your electrical diagnostic fleet with our complementary testing tools:

• Transformer Test Equipment — Explore our parent category for complete transformer testing tools.

• High Voltage Test Equipment — Complete AC/DC hipot and insulation withstand systems.

• Electrical Testing — Complete portfolio of portable instruments and diagnostic test sets for power grids.

Frequently Asked Questions

Q1: What is a CT PT Analyzer used for?

A CT PT Analyzer is an automated test instrument used to evaluate the electrical parameters of Current Transformers (CT) and Potential Transformers (PT). It measures excitation curves, knee-point voltage, ratio error, phase displacement, polarity, winding resistance, and secondary burden.

Q2: How does a low-voltage CT PT Tester measure high knee-point voltages?

Modern Current Transformer Analyzers apply variable frequency AC signals at lower voltages (e.g., 120V/200V) to excite the core. By analyzing core magnetic characteristics at reduced frequencies, the software accurately calculates equivalent 50/60Hz knee-point voltages up to 40kV according to IEC/IEEE mathematical formulas without using dangerous high voltage.

Q3: Why is CT polarity testing critical in substations?

Reversed CT polarity causes directional and differential protection relays to interpret normal load current as an internal fault, triggering unnecessary breaker trips. A CT PT Tester verifies correct wiring polarity prior to energization.

Q4: Why must a current transformer testing system include automated demagnetization?

DC testing (such as winding resistance checks) or high-current disruptions leave residual magnetism in the CT core. Residual flux increases ratio errors and shifts knee points. Weshine CT PT Analyzers automatically demagnetize the core upon test completion to ensure long-term measurement accuracy.