Capacitance & Tan Delta Tester

Product Introduction

Power plants, substations, and laboratories can make use of the highly accurate MOEORW-W4700A Dielectric Loss Tester. It gauges the capacitance and tangent delta (tan δ) of electrical equipment operating at high voltage. It uses digital notch filter technology to resist interference, supports multiple frequencies and test modes, has large-capacity storage and data export features, includes extensive safety protections, and can be powered by generators. It is compatible with a range of equipment, such as transformers and CVTs, and provides efficient operation with convenience.

Product Parameter (specification)

Operating Conditions	Temperature -10°C to 40°C, Relative Humidity RH < 80%
Interference Suppression Principle	Frequency Conversion Method
Power Supply	AC 220V ±10%, Generator Power Supply Permitted
High-Voltage Output	0.5kV to 10kV, adjustable in 0.1kV increments; Accuracy 2%; Maximum Current 200mA; Capacity 2000VA
Self-excited power supply	AC 0V to 50V/15A; Single frequency 50.0Hz, 60.0Hz; Automatic dual frequency conversion 45.0Hz/55.0Hz, 47.5Hz/52.5Hz, 55.0Hz/65.0Hz, 57.5Hz/62.5Hz
Resolution	Dielectric loss tangent tgδ 0.001%, capacitance Cx 0.001pF
Accuracy	Dielectric loss tangent deviation Δtgδ ±(1.0% of reading + 0.040%); Capacitance deviation ΔCx ±(1.0% of reading + 1.00pF)
Measurement Range	Dielectric loss tangent tgδ - unlimited; Capacitance Cx - 15 pF < Cx < 300 nF (Cx < 60 nF at 10 kV, Cx < 150 nF at 5 kV, Cx < 300 nF at 1 kV); Cx < 300 nF during CVT testing
Dimensions	Main unit 350 (L) × 270 (W) × 315 (H) mm; Accessories 350 (L) × 270 (W) × 160 (H) mm
Memory Capacity	200 sets, supports USB flash drive data storage
Weight	Main unit 22.55 kg; Accessories case 5.25 kg

Product feature and application

Extra-large LCD English display

Simple operation:

The instrument features a high-end full-touch LCD screen with an extra-large touch interface. Every process is clearly displayed, requiring no additional professional training for operators. A single tap completes the entire measurement process, making it an ideal intelligent dielectric loss measurement device.

Massive Data Storage

The instrument incorporates a calendar chip and large-capacity memory, storing up to 200 sets of data. Test results are saved chronologically, allowing easy access to historical records and print output.

Scientific and Advanced Data Management

Instrument data can be exported via USB drive for viewing and management on any PC.

Multiple Test Modes

The instrument supports various testing methods including internal high voltage, internal standard, positive connection, reverse connection, and self-excitation.

CVT Measurement Without Disconnecting High-Voltage Leads

Accurate measurement of CVT dielectric loss and capacitance values is possible without disconnecting the high-voltage leads.

CVT reverse-connection shielding method for C0 measurement

The instrument employs the reverse-connection shielding method to measure the dielectric loss and capacitance values of the upper terminal C0 on the CVT.

High-speed sampling signals

The internal inverter and sampling circuits are fully digitally controlled, enabling continuously adjustable output voltage.

Multiple Protections for Safety and Reliability

The instrument incorporates multiple protective measures against input voltage fluctuations, high-voltage current, output short circuits, power supply failures, overvoltage, overcurrent, and temperature extremes, ensuring safe and reliable operation.

It also features a grounding detection function that prevents testing from starting on ungrounded equipment. In the event of accidental connection to 380V power, an alarm function activates to protect the instrument from damage.

Prodection details

Application Scenario Categories: On-site testing at power plants/substations, laboratory precision measurement, emergency testing of generator power supply

Test Object Categories: Capacitive voltage transformers (CVT), voltage transformers (PT), current transformers (CT), high-voltage bushings, power transformers, insulating oil, standard capacitors/standard dielectric loss devices, other high-voltage power equipment (Capacitance Range: 15 pF to 300 nF)

Company Qualifications

FAQ

1)What technology does this instrument employ to address measurement challenges in strong electric field interference environments, and what frequency modes does it support?

Answer:
The instrument utilizes digital notch filtering technology to mitigate interference from power frequency electric fields, fundamentally ensuring measurement accuracy in strong electric field environments. It supports two frequency modes: single-frequency and automatic dual-frequency conversion:
Single-frequency: 50.0Hz, 60.0Hz;
Auto Dual Frequency: 45.0Hz/55.0Hz, 47.5Hz/52.5Hz, 55.0Hz/65.0Hz, 57.5Hz/62.5Hz.

2)What grounding and wiring requirements must be observed when powering the instrument with a generator?

Answer:
When using a generator or portable power source, strictly adhere to the following requirements to avoid "grounding error" warnings and instrument damage:
Grounding Requirements: The grounding terminals of both the instrument and the generator/portable power source must be reliably connected to earth to ensure proper grounding.
Wiring Specifications:
When drawing power from a source labeled AC220V, ground the N terminal (neutral wire) of the output wiring terminal.
When drawing power from an AC380V-labeled source, ground the neutral line (N terminal) and connect only one phase line (L terminal) to the N terminal to obtain AC220V voltage. Connecting two phase lines is strictly prohibited (to avoid high-voltage 380V input).

3)What special test functions and corresponding precautions are available when measuring CVTs?

Answer:
The instrument provides two core special test functions for CVTs (capacitive voltage transformers), with the following precautions:
Special Functions:
Measurement without disconnecting high-voltage leads: Accurately measure dielectric loss and capacitance values without removing the CVT's high-voltage leads;
Reverse-connection shielding method measurement: This method enables measurement of the dielectric loss and capacitance values of the upper terminal C0 on the CVT.
Precautions:
When performing separate CVT tests (measuring C1 or C2 individually), the outer shielding of the HV red high-voltage lead must be left floating and not placed on the ground. This prevents measurement inaccuracies caused by distributed resistance-capacitance parameters between the HV lead and ground.
The test voltage must be ≤2kV (applicable to both self-excitation and reverse-connection shielding methods).
When connecting to the self-excited output (ES terminal), use the instrument's dedicated connection cable to ensure good contact with the CVT secondary winding. This output will automatically deactivate when selecting positive/negative connection measurement methods.

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