Reliable Phase & Voltage Verification for Power System Protection
The 424K1105 25V Synchronism Check Relay is a precision protective relay designed to verify synchronism conditions before circuit breaker closing in electrical power systems. It ensures that voltage magnitude, phase angle, and frequency differences between two power sources remain within permissible limits, preventing out-of-step switching and mechanical or electrical damage.
Operating with a 25V rated control voltage, the 424K1105 relay is widely applied in generator synchronization, bus coupling, and grid interconnection scenarios where operational safety and system stability are critical.
Product infromation
Unlike simple voltage relays, the 424K1105 performs multi-parameter comparison between two live systems:
-Monitors phase angle difference
-Checks voltage level compatibility
-Verifies frequency alignment
-Issues a permission signal only when all synchronization conditions are met
This logic-based operation makes it an essential safeguard in both manual and automatic synchronization schemes.
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Key Features of the 424K1105 Relay
Dedicated Synchronism Supervision
Prevents unsafe breaker closure between unsynchronized sources
Stable 25V Control Circuit
Suitable for low-voltage control and protection systems
Fast Response & High Accuracy
Ensures precise timing during synchronization windows
Robust Electromechanical / Hybrid Design
Built for long-term use in industrial and utility environments
Wide System Compatibility
Integrates easily with generator panels, switchgear, and protection cabinets
Product Data
| Parameter | Description |
|---|---|
| Model | 424K1105 |
| Product Type | Synchronism Check Relay |
| Control Voltage | 25 V |
| Function | Verifies voltage, phase angle, and frequency before breaker closing |
| Application | Generator synchronization, bus coupling, grid interconnection |
| Operating Principle | Multi-parameter comparison between two live power sources |
| Output Signal | Permission / enabling signal for circuit breaker closing |
| System Compatibility | Generator control panels, switchgear, protection cabinets |
| Installation | Panel-mounted in protection or control systems |
| Operating Mode | Continuous monitoring |
| Typical Industry Use | Power plants, substations, industrial power systems |
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FAQ
Q1: What does the 424K1105 Synchronism Check Relay do?
A: It verifies voltage, frequency, and phase alignment between two power sources before permitting breaker closure.
Q2: What is the rated control voltage of this relay?
A: The 424K1105 operates on a 25V control voltage.
Q3: Is this relay suitable for generator synchronization?
A: Yes, it is specifically designed for generator-to-grid and generator-to-generator synchronization.
Q4: Can it be used in automatic synchronization systems?
A: Yes. It supports both manual and automatic synchronization schemes when integrated with control logic.
Q5: Does the relay directly close the circuit breaker?
A: No. It provides a permission or enable signal to the breaker control circuit.
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