Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of transformer dielectric loss tester in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What does a transformer dielectric loss tester do?
Engineered for utility companies, transformer manufacturers, and electrical testing service providers, our Transformer Dielectric Loss Tester (also known as a Tan Delta / Power Factor Tester) delivers laboratory-grade insulation diagnostics in a rugged, field-ready platform. Whether you're purchasing a single unit or placing a bulk order for fleet deployment, this instrument is purpose-built to reduce testing time, minimize operator error, and provide repeatable results that comply with IEC 60076, IEEE C57.12.90, and GB/T 6809 standards.
Understanding Dielectric Loss Testing: The Science Behind Insulation Health
Every power transformer, bushing, capacitor, or cable relies on its insulation system to prevent electrical breakdown. Over time, moisture ingress, thermal aging, partial discharge, and chemical contamination degrade insulation materials. The dielectric dissipation factor (tan δ) and power factor (cos φ) are the two most universally accepted indicators of insulation deterioration.
Where is this equipment used?
| Application Scenario | Test Object | Key Measurement | Applicable Standard |
|---|---|---|---|
| Transformer Acceptance Testing | New oil-filled transformers (10 kV – 500 kV class) | Tan δ, capacitance (Cx), power factor | IEC 60076-1, IEEE C57.12.90 |
| Preventive Maintenance | In-service power & distribution transformers | Trend comparison of tan δ over time | IEEE Std 62-1995, DL/T 596 |
| Bushing Diagnostics | Condenser-type bushings (OIP, RIP, RBP) | C1/C2 capacitance, tan δ at multiple voltages | IEC 60137, IEEE C57.19.01 |
| Cable Insulation Assessment | XLPE and oil-impregnated paper cables (≤ 35 kV) | Tan δ vs. voltage characteristic (tip-up test) | IEEE 400.2, IEC 60502 |
| Capacitor Bank QC | Shunt capacitors, coupling capacitors, CVTs | Capacitance deviation, loss factor | IEC 60871, IEEE Std 18 |
| GIS Insulation Verification | SF₆ gas-insulated switchgear spacer insulators | Tan δ at rated voltage | IEC 62271-203 |
| Rotating Machine Insulation | Generator & motor stator windings | Power factor tip-up (ΔPF between 25 % and 100 % Vn) | IEEE Std 286, IEC 60034-27 |
How can the precision and reliability of the equipment be verified?
Accuracy: Cx: ±(reading×1%+1pF)
tgδ: ±(reading×1%+0.00040)
Anti-interference indicators: variable frequency anti-interference, the above accuracy can still be achieved under 200% interference
Capacitance range: Internal high voltage: 3pF～60000pF/10kV 60pF～1μF/0.5k
External high voltage: 3pF～1.5μF/10kV 60pF～30μF/0.5kV
Resolution: Up to 0.001pF, 4 significant digits
tgδ range: unlimited, resolution 0.001%, automatic identification of three test products: capacitance, inductance and resistance.
Test current range: 10μA～5A
Internal high voltage: Set voltage range: 0.2～10kV
Maximum output current: 200mA
Frequency accuracy: ±0.01Hz
CVT self-excitation method low voltage output: output voltage 3~50V, output current 3~30A
What are the unique features of the transformer dielectric loss tester?
1. Internal High-Voltage Source - No External Boosting Required
Feature: Built-in 0.5 – 10 kV (continuously adjustable) high-voltage test source with a rated output of 200 mA.
2. Anti-Interference Technology - Accurate Results Under Live Substation Conditions
Feature: Proprietary digital variable-frequency power source (45–65 Hz ± 0.01 Hz) combined with Fourier-domain signal extraction algorithm.
3. Automatic Wiring Detection & Test Mode Selection (UST / GST / GSTg)
Feature: Intelligent terminal identification with automatic test circuit configuration for:
GST (Grounded Specimen Test) - measures total insulation loss to ground
UST (Ungrounded Specimen Test) - measures interwinding insulation with guard circuit
GSTg (GST with Guard) - measures insulation to ground while guarding unneeded windings
4. Wide Capacitance Measurement Range
Feature: Measurable sample capacitance from 3 pF to 60,000 pF (60 nF) in a single instrument without range switching.
5. Built-In Standard Capacitor
Feature: Internal high-stability reference capacitor (typically 50 pF or 100 pF ± 0.05 %, temperature coefficient < 5 ppm/°C) traceable to national metrology institute certification.
6. High-Resolution Touchscreen with One-Key Report Generation
Feature: Big-inch IPS LCD , capacitive touch, sunlight-readable (800 nits brightness). Built-in thermal printer. Data export via USB to PC (Excel-compatible CSV format).
How to Keep Your Instrument Accurate and Reliable?
| Frequency | Action | Purpose |
|---|---|---|
| Before each use | Visual inspection of cables, connectors, and chassis for damage. Verify ground cable continuity with a multimeter. | Prevent safety hazards from damaged insulation. |
| Monthly | Clean the touchscreen and ventilation openings with a dry, lint-free cloth. Remove dust from the HV output terminal with a clean brush. | Prevent tracking (surface discharge) on contaminated HV terminals. Maintain cooling airflow. |
| Quarterly | Run a self-calibration check using the internal reference capacitor (menu: System → Self-Cal). Compare the displayed standard capacitor value with the value on the calibration certificate. If deviation > 0.1 %, contact service. | Early detection of reference drift before it affects field measurements. |
| Annually | Factory recalibration recommended. Send the unit to our service center or an accredited metrology lab for full-range verification and adjustment. | Maintain traceability and measurement confidence. Recalibration interval of 12 months is consistent with ISO/IEC 17025 best practice for this class of instrument. |
| As needed | Replace the thermal printer paper roll (standard 58 mm × 30 m thermal paper; avoid PVC-based paper which can off-gas and corrode contacts). | Ensure test reports can be printed on-site. |
What kind of after-sales service terms can you provide?
| Service | Detail |
|---|---|
| Warranty | 12-month standard warranty from date of shipment . Covers all manufacturing defects in materials and workmanship. |
| Warranty scope | Includes free repair or replacement of defective components, firmware updates, and recalibration after repair. Excludes: damage from misuse, unauthorized modification, lightning/surge events, or normal wear items (printer head, cables). |
| Response time | Email response within 8 business hours. Remote diagnostic session (via video call with screen sharing) scheduled within 24 hours of initial report. |
| Spare parts availability | Critical spares (HV cable assemblies, measurement cable assemblies, fuse kits, printer heads) maintained in stock with same-day dispatch capability. |
Our address
Baoding Cloud Center, Hebei, China
Phone Number/whatsapp
+8613603329412
E-maildylan@dualcanopy.com
FAQ
Q1. What are the core applications of a high-current generator?
A: A high-current generator is mainly used for electrical equipment testing, such as verifying the carrying capacity of busbars, switches, and relays, as well as conducting short-circuit tests and overcurrent protection calibration in power systems.
Q2. How to select the right specification of a high-current generator?
A: You should consider key parameters including rated current, output voltage, working duration, and compatibility with the tested equipment. It is also necessary to match the generator with corresponding test accessories like current transformers or load boxes.
Q3. Is a high-current generator easy to operate and move?
A: Most industrial high-current generators are designed with a portable structure or equipped with casters for easy movement. The control panel is user-friendly, with clear buttons and digital displays, allowing operators to set parameters and start tests quickly after simple training.
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