Single Phase Preventer (SPP) | Key Uses Revealed

08-12-2023

Single Phase Preventer (SPP) And Its Uses

A single phasing preventer protects an induction motor from a single phasing defect. Single phasing is a particularly serious electrical motor defect that rapidly degrades the motor stator winding. The Selfguard is the best supplier and manufacturer of single phase preventer (SPP). In this blog, we’ll discuss why single-phase preventers are required how they work and their uses.

WHY ARE SINGLE-PHASE PREVENTERS REQUIRED?

Overloading caused by an unbalanced supply or single phasing is the leading cause of maximum motor burnout. Phase failure happens when a fuse blows, connections become loose, or the supply loses phase. Single-phase preventers are used to safe an induction motor against a single phasing failure. An extreme example of an unbalanced stator current is single phasing. Unbalanced stator current causes heating in the stator and may cause winding insulation to fail. Single phasing is a particularly serious electrical motor defect that rapidly degrades the motor stator winding.

In general, single phasing is nothing more than a motor running when one of the power supplies is removed owing to an open circuit, an incorrect contact in a switch, or other electrical equipment failure. Normally, the motor is powered by a three-phase supply that provides a balanced current to each phase winding. Consider the fact that one of the fuses has blown. However, the motor remains in a rotating position and attempts to rotate at the same pace. The absence phase current will be moved to the remaining live phases at the same time. As a result, the current in the other phases instantly increases to three times its typical value. This is known as a single phasing problem.

The imbalanced current in the motor stator is caused by the single phasing. The component present in this unbalanced current is known as the negative sequence component. The magnetic flux opposite the main flux is created by the negative sequence component. This causes double-frequency currents to be induced in the rotor, causing it to heat up. Current sensing single-phase preventers function similarly to a negative sequence relay. It protects up to the motor terminals. It works based on sensing the system's negative sequence components.

USES OF SINGLE PHASE PREVENTERS

It works on the premise of perceiving the system's negative sequence components.
Suitable for protecting motors of any horsepower.
Protection against single and reverse phasing, as well as unbalanced supply.
There is no need for a separate auxiliary supply.
Individual trip indication for single-phase preventers, reverse phasing, and output relay ON indication
Voltage hysteresis gap with auto reset for tripping on under/over voltage.
Single-phase preventers are used for induction motors to trip the feeder if one of the phases fails.
The single-phase preventers unit checks the health of all three phases of the supply and trips the feeder if one of them fails.

CONCLUSION

As we negotiate the complexities of electrical systems, recognising the relevance of a single-phase Preventer becomes critical. When you work with Selfguard, you get not just access to high-quality SPP solutions, but also a commitment to the lifespan and efficiency of your electrical infrastructure. With Selfguard, you can harness the power of prevention to protect your systems against the challenges of single-phasing. Must visit or contact +91-80903-80203 Selfguard the best manufacturer and supplier of automatic generator start and stop unit, automatic changeover switches and phase sequence correctors.