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GDGS
CHONGQING GOLD
Anti-interference Variable Frequency Transformer Tan Delta Tester for Insulating Sleeve Test
Introduction：
GDGS dielectric loss tester features a rich set of built-in test modes: GST positive connection method, UST reverse connection method, CVT self-excitation method, CVT turns ratio and phase angle difference test, GSTg transformer winding inter-layer test, and fully automatic LCR inductance, capacitance, and resistance measurement without removing high-voltage leads.
Equipped with a large full-touchscreen display, the onboard calendar chip can store 100 sets of time-based test records; it supports onboard thermal printing and data export via USB flash drive. Multiple hardware interlock protections fully ensure the safety of personnel and equipment at substation field locations.
Features：
1.Variable Frequency Digital Anti-Interference Technology:
Supports multiple single-frequency and dual-frequency combined test modes, with digital notch filtering algorithm to remove 50/60Hz stray interference. Even under strong electromagnetic interference conditions near live equipment in the substation, reliable data with good repeatability can still be obtained; supports generator power supply, meeting the conditions for station-wide power outage maintenance and testing.
2.Complete CVT Testing:
Enables one-click testing of fully sealed CVTs, simultaneously measuring C1 and C2 dielectric losses and capacitance with a single wiring connection; supports reverse shielding method for measuring C0 parameters at the upper end of the CVT; simultaneously completes CVT turns ratio and voltage phase angle difference detection, eliminating the need for additional testing equipment and significantly reducing on-site wiring workload.
3.Full-Mode Measurement Coverage:
Supports internal high voltage/external high voltage, internal standard/external standard; GST positive connection, UST reverse connection, self-excited method, GSTg transformer winding inter-winding test, and automatic LCR measurement. When connected to an external standard capacitor and external high voltage source, high voltage dielectric loss tests greater than 10kV can be performed. Transformers, instrument transformers, and bushings can all be tested using the corresponding modes directly.
4.Full Touchscreen Human-Machine Interface:
A high-definition full-touch color LCD screen with a graphical menu allows for simple clicks to complete the entire measurement process, requiring no in-depth professional training for operators. The device can store up to 100 sets of timestamped raw test data; a built-in thermal printer allows for direct on-site output of paper reports; a USB-Host interface allows for one-click export of all records to a USB flash drive for convenient computer archiving and analysis.
5.Multi-layer Hardware Safety Interlock Protection System:
Features multiple protections including input voltage fluctuation protection, high-voltage overcurrent protection, output short circuit protection, power failure protection, overvoltage protection, and overtemperature protection.
6.Forced grounding detection function:
If the instrument's grounding is unreliable, any test must be stopped to eliminate the risk of electric shock. Incorrect connection to a 380V input power supply will trigger an alarm to prevent equipment damage; an emergency stop button allows for one-click disconnection of the high-voltage output in emergencies.
7.Integrated overall structure:
The high-voltage boost unit, measuring bridge, power supply module, and printer are all integrated into one chassis, eliminating the need for bulky separate auxiliary cabinets. This facilitates transportation in different intervals and outdoor test sites, making it suitable for emergency repairs, inspections, and handover test scenarios.
Working Principle
Under AC voltage, the insulating medium consumes electrical energy and converts it into heat energy, which is called dielectric loss. The dielectric loss tangent, tgδ, is a key indicator for judging the moisture, aging, and defects of high-voltage insulation.
The GDGS-10kV instrument internally includes a standard capacitor circuit and a test sample circuit. The DSP high-speed acquires the current amplitude and phase difference of the two circuits, and calculates the capacitance Cx and dielectric loss tgδ of the test sample through vector calculation. Digital notch filtering suppresses external electromagnetic interference, ensuring measurement accuracy in complex field conditions.
Multiple test modes, such as GST, UST, CVT self-excitation, GSTg, and LCR, can be achieved through hardware and software switching, adapting to the field testing needs of different high-voltage equipment such as transformers, bushings, CVTs, PTs, and CTs.
Technical parameters
| Item | Specification |
|---|---|
| Operating Ambient | ‑10℃ ~ +40℃, RH＜80% non‑condensing |
| Power Input | AC220V±10%, compatible with generator power‑supply |
| Internal HV Output | 0.5kV ~ 10kV, adjustable per 0.1kV; Max current:200mA; Capacity:2000VA Voltage accuracy: ±(reading×2.0%+0.1kV) |
| Self‑Excited Output | AC 0‑50V /15A; multi‑frequency options available |
| Resolution | tgδ:0.001% ; Cx:0.001pF |
| Measurement Accuracy | Δtgδ: ±(reading×1.0%+0.040%)ΔCx: ±(reading×1.0%+1.00pF) |
| Measuring Range | tgδ unlimited 15pF＜Cx＜300nF(CVT test)Cx＜60nF@10kV ; Cx＜150nF@5kV |
| LCR Test Range | L＞20H(2kV), R＞10kΩ(2kV), accuracy ±2% |
| CVT Ratio Test | Ratio range:10‑10000; accuracy ±3% |
| Data Memory | 100 groups timestamp‑tagged records |
| Interfaces | USB Host(U‑disk export); Built‑in thermal printer |
| Display | Full‑touch large‑size color LCD |
| Protection | Ground‑detection, emergency‑stop, over‑voltage / over‑current / short‑circuit / over‑temp / wrong‑input‑voltage alarm |
Accessories
1 × GDGS Tan‑Delta IPF Tester Main Unit
1 × Accessory hard‑shell carrying case
1 × Red high‑voltage test cable
1 × Black low‑voltage signal test cable
1 × AC220V power‑input cord
1 × CVT self‑excited power‑cable
2 × Protective‑grounding wires Spare thermal‑printer paper roll & spare fuses
1 × Full‑version English‑Chinese operation manual
1 × Factory calibration test report
Application Scenarios
1.Power Grid Substations: Transformer, bushing, CVT, PT, CT handover and preventative dielectric loss testing
2.High-Voltage Equipment Manufacturers: Transformer and instrument transformer factory dielectric loss acceptance testing
3.Wind Power and Solar Power Step-Up Stations: Periodic insulation testing of high-voltage electrical equipment within the station
4.On-site testing by third-party power testing agencies
5.Laboratory research on the dielectric loss performance of high-voltage insulation materials
6.GSTg mode for testing inter-winding capacitance and dielectric loss of two-winding and three-winding power transformers
Contact us
Contact Person: Christine Gou
Mobile/Whastapp/Wechat: +86 15123029885
Email: gold05@hy-industry.com
