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GDKC-5000 Transformer On-Load Tap Changer Tester

GDKC-5000 Transformer On-Load Tap Changer Tester

GDKC-5000 Digital Intelligent AC/DC Universal Transformer On-Load Tap Changer Tester with Three-Phase Independent Constant Current Source, High-Speed Waveform Acquisition, Built-in Fault Analysis Algorithm, for On-Site OLTC Electrical Characteristic Measurement.

Description
Specifications
Applications
Advantages
FAQ
Recommended Products

Description

The GDKC-5000 is a professional-grade, classic AC/DC universal on-load tap changer (OLTC) testerexclusively designed for on-site electrical characteristic testing and fault diagnosis of OLTCs in power transformers and special transformers in power systems, transformer manufacturing and industrial enterprises. It fully complies with DL/T 846.8-2017, GB/T 10230.1-2019 and IEC 60214-1:2019 standards, adopting advanced high-speed waveform analysis technology that eliminates the need to lift the transformer core or disassemble the OLTC, enabling direct on-site testing without power outage or equipment disassembly.

The instrument features an innovative three-phase independent constant current source design that supports both with-winding and without-winding test modes, adapting to various transformer winding connections (Y, △, YN). The four-terminal measurement method eliminates the influence of lead resistance, ensuring accurate measurement of transition resistance without additional compensation. Its 30kHz high-speed synchronous sampling system with 0.1ms ultra-high time resolution captures the complete dynamic process of OLTC switching, including subtle changes in transition waveform and contact bounce. The built-in intelligent waveform analysis algorithm automatically identifies common OLTC faults such as transition resistor breakage, poor contact, excessive bridging time and asynchronous switching.

Specifications

Parameter	Specification
System Parameters
Compliance Standard	DL/T 846.8-2017, GB/T 10230.1-2019, IEC 60214-1:2019, DL/T 596-2021
Test Principle	High-speed waveform analysis method (AC/DC universal)
Test Modes	With-winding test / Without-winding test
Winding Connections	Y, △, YN
Operation Mode	One-click fully automatic test / Manual test
Display	7-inch 800×480 color capacitive touch screen
Language Support	Chinese / English bilingual
Data Storage	1000 groups test data + waveforms
Communication Interface	USB 2.0 (data export)
Report Generation	One-click Word format report
Electrical Parameters
Output Current	3A/1A, 0.6A/0.2A selectable
Open Circuit Voltage	24V DC maximum
Current Ripple	≤0.1%
Measurement Performance
Transition Resistance Range	0.4Ω ~ 20Ω (1A gear), 10Ω ~ 100Ω (0.2A gear)
Resistance Accuracy	±(5% of reading + 0.1Ω)
Transition Time Range	0 ~ 300ms
Time Resolution	0.1ms
Time Accuracy	±0.1ms
Synchronization Accuracy	±0.1ms
Sampling Rate	30kHz synchronous sampling (3 channels)
Waveform Record Length	300ms
Power Supply
Input Power	AC 220V±15%, 50Hz±1Hz
Power Consumption	≤30W (average), ≤100W (peak)
Physical Parameters
Main Unit Dimensions	360×260×150mm (L×W×H)
Cable Box Dimensions	360×260×150mm (L×W×H)
Main Unit Weight	~6kg
Cable Box Weight	~4kg
Total Weight	~10kg
Housing	Rugged aluminum alloy chassis
Protection Grade	IP54
Operating Temperature	-10℃ ~ +50℃
Storage Temperature	-20℃ ~ +60℃
Humidity	≤85% RH (non-condensing)
Altitude	≤2000m (customizable for higher altitudes)

Applications

Core Test Objects

On-Load Tap Changers: ABB, Siemens, Schneider, MR, Xi'an XD and other domestic and international mainstream OLTC models
Power Transformers: 10kV ~ 1000kV oil-immersed power transformers, distribution transformers and special transformers
Voltage Regulators: On-load voltage regulators, step voltage regulators

Typical Usage Scenarios

Power companies: Substation preventive maintenance, OLTC regular inspection, fault diagnosis and analysis
Transformer manufacturers: Factory quality control, batch production inspection, type test verification
Power plants: Generator transformer OLTC test, auxiliary equipment transformer inspection
Industrial enterprises: Internal transformer maintenance, OLTC routine testing
Third-party testing institutions: Transformer certification testing, on-site calibration services

Advantages

Compliance with Latest International Standards

Fully meets DL/T 846.8-2017 Chinese industry standard, GB/T 10230.1-2019 national standard and IEC 60214-1 international standard → test results are recognized by certification bodies worldwide

Industry-Leading No Core Lifting Testing

Eliminates the need to lift the transformer core or disassemble the OLTC, reducing test time by 90% and avoiding mechanical adjustment after reassembly → the only practical solution for on-site OLTC testing

AC/DC Universal & Dual Test Modes

Supports both AC and DC test methods, as well as with-winding and without-winding test modes → adapts to all types of transformers and OLTC models, no need for multiple test instruments

High-Precision & Accurate Measurement

Four-terminal measurement method, 30kHz high-speed sampling, 0.1ms time resolution → accurately captures subtle changes in OLTC switching process, identifies early hidden faults

Built-in Intelligent Fault Analysis Algorithm

Automatically identifies common OLTC faults and provides diagnostic suggestions → eliminates the need for professional analysts, reduces operator skill requirements

Comprehensive Data Management & Report Generation

1000 groups data storage, USB export and one-click Word report generation → simplifies data analysis and report writing, reduces operator workload

FAQ

Q: What is the waveform analysis method and how does it work?

A: The waveform analysis method is the international standard quantitative testing method for OLTC electrical characteristics. It works by applying a constant current or voltage across the OLTC contacts during switching. The voltage and current waveforms during the switching process are recorded at high speed, and the transition resistance, transition time, three-phase synchronization and other parameters are calculated by analyzing the waveform changes. This method can accurately capture subtle changes in the switching process and identify early hidden faults that cannot be detected by traditional methods.

Q: What is the difference between with-winding and without-winding test modes?

Without-winding test: The OLTC is tested separately after being disassembled from the transformer. It provides the most accurate measurement results but requires core lifting and switch disassembly, which is time-consuming and labor-intensive.
With-winding test: The OLTC is tested directly on the transformer without disassembly. It is fast and convenient, but the measurement results are affected by the transformer winding resistance. GDKC-5000 adopts advanced compensation algorithm to eliminate the influence of winding resistance, ensuring accurate measurement results even in with-winding mode.

Q: What common OLTC faults can GDKC-5000 identify?

A: GDKC-5000 can automatically identify the following common OLTC faults by analyzing the transition waveform:

Transition resistor breakage: Abnormal waveform with infinite resistance during transition
Poor contact: Fluctuating resistance waveform and increased contact bounce
Excessive bridging time: Longer than standard transition time
Asynchronous switching: Large time difference between three-phase switching
Contact wear: Increased transition resistance and bounce time
Spring fatigue: Decreased switching speed and increased transition time

Q: How to calibrate the instrument?

A: GDKC-5000 can be calibrated using standard resistors and standard time generators with accuracy not lower than 0.2 class. The calibration procedure is simple and fast: