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What Is the 6 Phase Relay Protection Tester
The SGJB-3 is a secondary-injection instrument for testing protection relays and microprocessor-based protection devices. Its nominal configuration provides six current channels and six voltage channels, allowing users to select an output arrangement suited to the relay under test. The software supports adjustment of amplitude, phase angle and frequency, while digital inputs can monitor relay contact changes. Test results can be recorded for review and reporting..
Which Output Configurations Are Available?
The operating manual describes several output arrangements:
Standard three-phase AC testing
Six-phase voltage output
Six-phase current output
Simultaneous voltage and current output, using six voltage and six current channels
Sequence-component output for relevant AC tests
Dedicated DC voltage and current testing
Available functions may depend on the unit configuration and software version. Confirm the required output mode when requesting a quotation.
What Are the Main Features?
Flexible channel use: Voltage and current outputs can be assigned to different relay test arrangements.
Adjustable AC parameters: Users can set output amplitude, phase angle and frequency for each relevant channel.
AC and DC testing: The instrument supports AC relay tests and dedicated DC output for devices such as DC voltage, time and auxiliary relays.
Linear power amplifier: The manual describes a DSP-controlled output system using linear amplifiers and high-resolution D/A conversion.
Relay contact monitoring: Eight input channels and four relay outputs are available for test control and contact-related checks.
Software-based operation: The software includes manual, semi-automatic and automatic test modes, as well as vector display and test-report functions.
Protective functions: The manual lists hardware protection for conditions including overheating, overcurrent, overvoltage and short circuit.
What Benefits Can It Bring to a Relay Testing Workflow?
The six-current and six-voltage channel arrangement gives test engineers more options than a basic three-phase injection setup. This is useful when the test plan requires several independent current or voltage inputs, including certain transformer differential tests.
Operators can adjust variables in steps, observe vector relationships and record relay action or return values. These functions help keep test settings and results together for later review. They do not replace the need to follow the relay manufacturer's settings, wiring diagram or approved test procedure.
What Are the SGJB-3 Technical Specifications?
| Parameter | Specification in the supplied manual |
|---|---|
| Model | SGJB-3 |
| Current channels | Six-phase |
| Voltage channels | Six-phase |
| AC current output | 0–30 A per phase in six-phase mode; 0–60 A per phase in three-phase mode; up to 180 A in six-phase parallel mode |
| Long-duration phase current | 10 A listed as the allowable long-term phase current |
| Maximum six-phase parallel output time | 10 seconds at maximum output, according to the manual |
| DC current output | 0 to ±10 A per phase |
| AC voltage output | 0–120 V per phase; up to 0–240 V line-to-line |
| DC voltage output | 0 to ±160 V per phase; up to 0 to ±320 V line-to-line |
How Does a Typical Test Proceed?
Identify the relay, its rated input values and the required test points.
Choose the suitable AC, DC or application-specific software module.
Wire the voltage, current and digital input channels according to the relay diagram and test plan.
Set the output values, phase angles and test mode.
Apply the test signal and monitor the relay response.
Save or print the test record, then stop output before changing connections.
How Does It Compare with a Conventional Three-Phase Test Set?
| Comparison point | Typical three-phase test arrangement | SGJB-3 arrangement described in the manual |
|---|---|---|
| Output channels | Usually arranged around three-phase relay tests | Six current and six voltage channels are listed |
| Differential protection testing | May require additional wiring or test equipment, depending on the test set | Six current channels can support more complex current-injection arrangements |
| Test functions | Often focused on common three-phase checks | Manual lists AC, DC, sequence, differential, distance, frequency and other test modules |
| Selection criteria | Suitable when the required test plan fits its output channels | Consider when the test plan needs additional independent outputs |
FAQ
Does "six-phase" mean the instrument is designed for a six-phase power grid?
No. In this product context, the term refers to the voltage and current output channels available for relay testing, not a six-phase utility network.
Can the unit output 180 A continuously?
The manual lists 180 A for six-phase parallel output and gives a maximum working time of 10 seconds at maximum output. It also lists 10 A as the allowable long-term phase current. Confirm the duty limits for the actual configuration.
Can it test DC voltage and time relays?
Yes. The manual describes a DC test module for applications including DC voltage relays, time relays and auxiliary relays.
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