High-Current Generator

The MOEORW-WGA18S High-Current Generator-commonly referred to in the industry as a Current Booster, CT Primary Injection Tester, or Ratio & Polarity Tester-is an intelligent testing device purpose-built for relay protection and on-site CT verification in power systems. This high-current tester integrates high-current output, automatic ratio calculation, polarity discrimination, stopwatch timing, and coil temperature monitoring into a single unit, capable of completing CT ratio verification, primary injection testing, and polarity determination in one device.

As a true high-current generator, the WGA18S employs a large-capacity toroidal transformer architecture, delivering up to 1000A output from a 220V single-phase input-eliminating the dependency on three-phase power or heavy-duty distribution panels at field sites. With a total weight of only 30kg, it can be easily carried by a single person, making it ideal for mobile operations in substations, power plants, and switchgear rooms. Whether you call it a current booster or a CT primary injection tester, the core mission of this device remains unchanged-to provide stable, accurate, and safe power for high-current testing.

Intelligent Judging – Say Goodbye to Manual Calculation
Conventional current boosters merely deliver current; operators must manually read meters and calculate ratio and polarity, which is highly error-prone. The WGA18S high-current tester integrates an ARM embedded controller that automatically samples the secondary current signal during output, computes and displays the ratio in real time, while an LED indicator clearly shows polarity (subtractive or additive). The entire process requires no human intervention, eliminating reading errors and miscalculations.

Genuine High-Capacity Output with Real Materials
The device employs a high-permeability toroidal transformer with a closed magnetic circuit and minimal leakage flux, delivering significantly higher effective output capacity than EI-type transformers of the same volume. As a professional CT primary injection tester, it offers two wiring modes at the output terminals: parallel connection (1000A / 5V) for low-impedance loop primary injection testing, and series connection (500A / 10V) for higher-impedance loop boosting requirements. Both modes can be freely switched during wiring without additional accessories. The output waveform is a standard 50Hz sine wave, fully compliant with State Grid requirements for realistic CT test power sources, ensuring legally valid test results.

Safety Redundancy – Dual Protection Mechanisms
Overheating and accidental overload are the greatest concerns in high-current testing. The WGA18S ratio & polarity tester incorporates two independent protection systems: hardware overload protection continuously monitors output current and instantly cuts off the main circuit once the set threshold is exceeded; software thermal protection embeds a temperature sensor inside the coil, triggering a flashing overheat indicator and buzzer alarm when the temperature exceeds 55°C, compelling the operator to reduce current or pause the test. Additionally, an independent red emergency stop button on the panel can cut off output instantly under any abnormal condition, maximizing protection for both the CT under test and the booster itself.

60-Second Countdown – Standardized Test Procedures
Per electrical safety regulations, individual high-current injection tests should not be prolonged. The WGA18S high-current generator features a built-in stopwatch timer, allowing users to set the test duration (up to 60 seconds). When the countdown enters the final 60 seconds, the buzzer emits an intermittent alarm, reminding the operator to prepare for test termination. This function not only standardizes operating procedures but also effectively prevents extended overload due to negligence.

Wide-Range Ratio Measurement
This ratio & polarity tester covers a CT ratio measurement range from 25000A / 5A down to 5000A / 1A, accommodating the primary/secondary ratio requirements of virtually all current transformers on the market-whether busbar CTs in substations or compact CTs inside switchgear, all can be quickly verified.

The WGA18S high-current tester (current booster / CT primary injection tester) is purpose-built for field operations and laboratory verification in the power industry. Typical applications include:

CT Ratio Verification Before Substation Commissioning: Newly installed or overhauled current transformers require ratio and polarity confirmation before energization. This high-current generator injects high current into the primary side while the secondary connects to a standard meter or directly reads the onboard measurement, delivering ratio results on the spot-far more efficient than traditional point-by-point methods.

Primary Injection Check for Complete Switchgear Assemblies: During factory testing or after on-site installation, this CT primary injection tester injects simulated load current through the CT primary side to simultaneously verify secondary circuit continuity, all series winding conductivity, and proper current sampling by protection devices. A single unit covers CT loop verification for an entire row of switchgear.

CT Calibration for Generator-Transformer Unit Protection in Power Plants: Large generator sets have numerous CTs with high ratios. The WGA18S current booster's wide ratio range and portability enable rapid spot checks or full inspections during unit overhauls, significantly shortening maintenance schedules.

High-Current Temperature Rise Testing on Distribution Transformer Low-Voltage Sides: Apply rated current to the low-voltage side of distribution transformers, combined with infrared thermometers to check connection point temperature rise. The WGA18S high-current tester serves as a stable high-current heat source.

Ratio Standard Comparison in Research Institutes and Testing Laboratories: As a mobile high-current generator, it is used for comparative calibration of various clamp-on ammeters and handheld ratio testers.

AC CT Inspection in DC Traction Systems for Rail Transit: For AC CTs used in subway and light rail power supply systems, the WGA18S ratio & polarity tester provides standard 50Hz high-current excitation to verify whether ratio and polarity meet protection setting requirements.

The MOEORW-WGA18S High-Current Generator (Current Booster / CT Primary Injection Tester) comes complete with a full set of standard accessories to ensure ready-to-use operation upon delivery. Flexible optional configurations are also available for bulk purchasers and special on-site requirements.

Standard Accessories List (Included with the Main Unit)

Accessory Notes:

High-Current Output Cables: Made of large-cross-section copper flexible cables (≥100mm²) to ensure temperature rise stays within allowable limits during full 1000A output. To reduce line impedance and maximize output efficiency, users are advised to keep output leads as short as possible and prioritize parallel wiring configuration. Extended-length cables are available upon request for longer distances.

Power Input Cable: Standard cable with cross-section ≥2mm², compatible with standard 220V/50Hz single-phase outlets. If extended reach is needed via distribution panels, a cable with cross-section ≥4mm² is recommended; otherwise, output power may be compromised.

Grounding Cable: Reliable grounding before each test is mandatory. The supplied grounding cable meets standard requirements.

Optional Recommendations (For Wholesale Clients & Special Scenarios)