Active Transformer Capacity And Characteristic Tester

Product Introduction

A high-precision handheld instrument for on-site verification of distribution-transformer capacity, no-load & load (short-circuit) loss, impedance voltage and energy-efficiency rating - for both single-phase and three-phase transformers. Built-in power source means no external voltage regulator or boosting transformer is required.

Why "Active"? - Built-in Source, Real On-site Portability

Unlike passive testers that must be fed by an external regulating transformer and heavy boosting equipment, the MOEORW-WBT67 is an active tester with an integrated three-phase AC source and rechargeable battery. Field crews can perform capacity and loss tests directly at the transformer - in a substation, on a pole-mounted unit, or inside an enterprise distribution room - without hauling external power gear.

Designed to stop electricity fraud. Under China's two-part tariff, users pay a basic charge by declared transformer capacity. Some illegally swap nameplates or up-rate units to pay less. The MOEORW-WBT67 is purpose-built for electricity inspection & nameplate-capacity verification - it measures the actual capacity and loss, exposing tampered or over-rated transformers. Ideal for power utilities, transformer manufacturers and anti-theft inspection teams.

Product Parameter (specification)

1. Environmental Conditions
Temperature	-5°C to 40°C
Relative Humidity	<95% (at 25°C)
Altitude	<2500m
External Interference	No extreme vibration, no strong electromagnetic fields
External Power Supply	220VAC ±10%, 45Hz to 55Hz
2. Measurement Range
Active Components
Current Output	0 to 10A
Voltage Measurement	0–10V
Test Capacity
10kV Oil-immersed/Dry-type Transformers	30kVA–2500kVA
35kV Oil-immersed Transformers	50kVA–31500kVA
20kV Dry-type Transformers	50kVA–2500kVA
35kV Dry-Type Transformers	50kVA to 2000kVA
Characteristics Section
Voltage	0 to 600V, automatic internal range switching
Current	0 to 100A, automatic internal range switching
Frequency	45Hz to 65Hz
3. Test Accuracy
Voltage	2–100V, ±0.2% FS; 100–450V, ±0.2%
Current	0.5–10A, ±0.2% FS; 10–100A, ±0.2%
Power	±0.5% (CosΦ > 0.1), ±1.0% (0.02 < CosΦ < 0.1)
4. Insulation Strength
Insulation resistance between voltage/current input terminals and chassis ≥100MΩ. Withstands 2kV (RMS) power frequency voltage between power input terminals and chassis for 1 minute.
5. Other Specifications
Dimensions	400×300×170mm
Weight	6kg (excluding test leads)

Key Features

Accurately measures the capacity of various distribution transformers - convenient and precise.
Measures capacity, energy-efficiency rating, type, no-load current, no-load loss, short-circuit (load) voltage and short-circuit (load) loss in one unit.
Internal auto range-switching across a wide voltage/current range with simple wiring.
During no-load and load tests on three-phase transformers, the instrument auto-verifies wiring correctness and displays the three-phase voltage/current vector diagram (dual-/three-wattmeter method, internally pre-wired).
Single unit performs full-current load tests for distribution transformers below 1000 kVA; at one-third rated current it covers units below 3150 kVA and calculates rated-current load loss automatically.
All results auto-corrected: waveform, temperature, non-rated voltage and non-rated current corrections - for higher accuracy. Two temperature-correction algorithms (coefficient method & national-standard formula).
320×240 high-brightness LCD with full menu and operation prompts (English/Chinese selectable), touch keys, wide-temperature LCD with brightness adjustment.
Up to 40 preset specimen parameter sets, add/delete as needed.
Built-in real-time clock auto-records test date & time.
Panel thermal printer for instant on-site printout (includes judged energy-efficiency grade).
Power-off data storage & browse for up to 500 test records; connects to a PC for data export via communication port + USB.
External voltage/current transformers can extend the measuring range to cover any parameter of the test object.

Application Scenarios

Electricity inspection & capacity verification

Detect nameplate tampering and illegal up-rating; verify the actual declared capacity for correct basic-charge billing.

Factory acceptance tests

Verify no-load/load loss, impedance voltage and efficiency rating before a transformer ships or is commissioned.

Routine maintenance & handover

Periodic condition checks for power utilities, transformer manufacturers and enterprise distribution rooms.

On-site portable testing

Substations, pole-mounted units and indoor rooms - no external regulator needed thanks to the built-in source.

Standards & Transformer Compatibility

Capacity & type testing targets national-standard distribution transformers with a 400 V AC low-voltage side (three-phase). The instrument supports common type series:

Oil-immersed types

S(H)7 / 9 / 11 / 13 / 14 / 15 series.

Dry-type (SCB) types

SCB9 / 10 / 11 / 12 at 100 °C, 120 °C and 145 °C insulation classes.

Single-phase & three-phase

Both winding configurations supported; connection-group type is selectable.

Reference type output

Reports judged capacity, measured capacity, national-standard loss, corrected loss, impedance voltage and reference type.

Built-in Battery & Charging

The instrument ships with a pre-activated rechargeable battery. For best performance:

Check battery level before use; if a severe under-voltage warning appears, stop and recharge promptly - battery damage from use under low charge is not covered by free warranty.
Charge indicator: red = charging, green = full.
Avoid under-charging or deep discharge; keep stored battery voltage above 12 V.
If stored long-term, keep it fully charged in a dry, ventilated place at 5–25 °C and recharge every 2 months.

Safety Notes

I/O terminals and test posts may be live. Sparks can occur when plugging/unplugging test leads or the power socket - beware of electric shock.

Ground the chassis ground post as well as the power-cord ground; verify proper grounding before connecting terminals.
Use only the specified type and rating of fuse.
Do not operate with the cover/panel removed, in wet environments, or in explosive atmospheres.
Connect/disconnect test leads only when the terminals are de-energized.
Only qualified technicians may perform maintenance; stop use if the unit is suspected damaged.

FAQ

Q: 1. How does the MOEORW-WBT67 ensure operator safety?

A: Proper grounding is mandatory - both via the power-cord ground and the chassis ground post. Only the specified fuses are used, the cover must stay fitted, test leads are connected/disconnected only when de-energized, and operation in wet or explosive environments is prohibited. The unit also warns on severe battery under-voltage.

Q: 2. In what ways is the instrument convenient to operate?

A: Internal auto range-switching and simple wiring; automatic wiring verification with a live vector diagram; 40 storable specimen parameter sets; touch keys with bright LCD; real-time clock; panel thermal printer; 500-group power-off storage; PC data export; and external VT/CT range extension.

Q: 3. How should the battery be maintained during long storage?

A: Check charge before use and recharge immediately on a low-voltage warning. Keep stored battery voltage above 12 V; if unused for long periods, store fully charged at 5–25 °C in a dry, ventilated place and top up every 2 months. The battery is pre-activated at the factory.

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