Megger FRAX Sweep Frequency Response Analyser
Power transformers are some of the most important components in today’s electrical networks. When a transformer fails, it can cause long and costly outages as well as expensive repairs. Regular testing is vital to detect problems before they lead to failure. The Megger FRAX Sweep Frequency Response Analyser is designed to make this testing accurate, simple and reliable.
The megger FRAX series helps engineers detect both mechanical and electrical issues that other test methods may not find. It uses a process called Sweep Frequency Response Analysis (SFRA) to record a unique “fingerprint” of a transformer. Each test result can then be compared with previous data to show if the mechanical parts inside the transformer have changed. Any difference in the fingerprint indicates a possible mechanical or electrical change that needs attention. The megger FRAX is an investment that saves both time and money while keeping your equipment in top condition.
Early warning of transformer faults
Most transformer breakdowns begin with small internal changes in the winding or core structure. These changes can happen because of vibration during transport, short-circuit forces or normal ageing of insulation materials. If these movements are not detected early, they can lead to serious dielectric or mechanical faults.
The Megger FRAX Sweep Frequency Response Analyser is built to find these early signs. It measures how a transformer reacts to a range of frequencies, then analyses the results to spot any differences from the expected pattern. By catching small internal changes before they cause damage, the megger FRAX reduces maintenance costs and improves network reliability.
Key features of the Megger FRAX
- Suitable for medium and high-voltage substations and industrial use
- Highest dynamic range and accuracy available in its class
- Meets international SFRA standards (IEC 60076-18 and IEEE C57.149)
- Advanced software with built-in analysis and decision support
- FRAX 150 model includes a built-in PC with a 12-inch touchscreen
- Wireless communication on the FRAX 101 model
- Optional battery power for FRAX 99 and FRAX 101
- Continuity control of ground connections for FRAX 99 and 150
Faults detected by the Megger FRAX
- Winding movement or deformation
- Shorted turns and open windings
- Broken clamping structures
- Core connection problems
- Partial winding collapse
- Faulty core grounds
- Core movement or displacement
These types of faults are difficult to identify with other testing methods. The Megger FRAX Sweep Frequency Response Analyser provides the accuracy needed to see even the smallest change in transformer condition.
How the Sweep Frequency Response Analyser works
The megger FRAX sends a small electrical signal through a transformer winding and measures how it reacts over a wide range of frequencies. The result is a curve that represents the transformer’s unique frequency response. By comparing this curve with earlier results, engineers can see if anything inside the transformer has shifted or changed.
The analyser uses powerful algorithms to compare data automatically. The software highlights differences and ranks their severity, giving the operator clear guidance on whether further inspection is needed. This makes testing quicker and more consistent across different sites and users.
Designed for field use
The Megger FRAX Sweep Frequency Response Analyser is compact, lightweight and rugged, making it ideal for use in substations or industrial locations. The FRAX 99 and FRAX 101 models can run on battery power, which is useful in remote areas without mains electricity. The FRAX 150 includes an integrated PC with a large touchscreen, allowing you to run tests and review data directly on site.
The user interface has been designed for ease of use. Operators can quickly switch between different graphs, zoom in for detailed views and change colour settings for easier comparison. Each sweep can be turned on or off individually, and automated analysis tools are always available at the touch of a button.
Software and connectivity
All models in the megger FRAX series come with advanced Windows software for data storage, comparison and reporting. The software supports a wide range of file formats and can import data from other test systems. You can export results as XML, CSV or text files for easy sharing and record-keeping.
The FRAX 101 model includes Bluetooth for wireless communication, while all versions support USB data transfer. Built-in analysis tools provide correlation comparisons that make it easier to spot frequency or amplitude shifts. These features help engineers make confident, informed decisions when assessing transformer health.
Each unit is supplied with the FTB101 Field Test Box, which allows you to check cable and instrument integrity before and after a test. This verification ensures accurate results every time, even under challenging field conditions.
Proven quality and performance
The Megger FRAX Sweep Frequency Response Analyser is built for reliability. It can operate in temperatures from -20°C to +55°C and handle humidity up to 95%. The strong housing and high-quality connectors are designed for years of dependable service. Every kit includes generator and measurement cables, clamps, grounding accessories and a sturdy transport case.
Megger is known worldwide for precision electrical test equipment, and the megger FRAX continues that tradition. It offers unmatched accuracy, full compliance with international standards and the reliability you need in critical testing environments.
FRAX Model Comparison
| Feature | FRAX 99 | FRAX 101 | FRAX 150 |
| Primary Power | Optional internal battery (49 Wh) or 11–16 V DC supply | Optional internal battery (24 Wh) or 11–16 V DC supply | AC mains powered (90–264 V AC, 47–63 Hz) |
| Battery Operation | Optional | Optional | No |
| Wireless Communication | No | ✔ (Bluetooth) | No |
| Built-in PC / Touchscreen | No | No | ✔ – Integrated PC with 12″ touchscreen |
| Operating System | Uses external PC with FRAX software | Uses external PC with FRAX software | Windows Embedded (standalone operation) |
| Dynamic Range | > 130 dB | 150 dB | > 150 dB |
| Frequency Range | 0.1 Hz – 25 MHz | 0.1 Hz – 25 MHz | 0.1 Hz – 25 MHz |
| Ground Loop Detection | ✔ | No | ✔ |
| Continuity Control of Ground Connections | ✔ | No | ✔ |
| USB Connectivity | ✔ (1 × Type B) | ✔ (1 × Type B) | ✔ (4 × Type A, 1 × Type B) |
| Data Storage | On connected PC | On connected PC | Internal memory (up to 1000 records) + USB external storage |
| Dimensions (Instrument) | 410 × 340 × 205 mm | 300 × 169 × 55 mm | 300 × 169 × 55 mm |
| Weight (instrument only) | 8.5 kg | 1.4 kg | 1.95 kg (with battery) |
| Included Field Test Box (FTB101) | ✔ | ✔ | ✔ |
| Typical Use Case | Portable SFRA testing | Portable SFRA testing with wireless control | Standalone SFRA testing and advanced analysis on screen |
❓ Frequently Asked Questions (FAQ)
Q1: What does the Megger FRAX Sweep Frequency Response Analyser do?
A. It measures how a transformer responds to electrical signals at different frequencies to detect mechanical or electrical changes inside.
Q2: Why is Sweep Frequency Response Analysis important?
A. SFRA reveals internal transformer issues such as winding movement or core faults before they cause major failures.
Q3: Can the Megger FRAX be used in the field?
A. Yes. It is compact, durable and available in battery-powered models for easy use on site.
Q4: Does the FRAX meet international standards?
A. Yes. It meets IEC 60076-18, IEEE C57.149 and other recognised SFRA testing standards.
Q5: What comes with the analyser?
A. Each unit includes all test leads, clamps, ground cables, the Field Test Box (FTB101), software and a transport case.
Note: Be sure to check the official datasheet before buying, and the user manual before using any test equipment. Need training? Just reach out - we’re happy to help