Supply Voltage +
Mode +
Mounting +
Relay +
No. Of Programs +
Display +
Power Reserve +
Clock Accuracy +
Pre-Programmed +
Accessories +
Product visibility +
Analog Input +
Base/Ext +
Bazel type +
Center Distance +
Clock +
Control Action +
Display with & without +
Input/Output +
No. of digits +
No. of set points +
Output +
Output 1 +
Output 2 +
Output 3 +
Product Type +
Read Out +
Register +
RS485 Communication +
Sensor Input +
Size +
Termination +
Contact +
Delay +
Enclosure Design +
Function +
Input Voltage +
Output Current +
Output Voltage +
Power +
Relay Output +
Supply +
Timing Range +
Variant +
Alarm Output +
Analog Output +
Auto Reset time +
Auxiliary Supply +
CBCT Size +
Colour +
Current Range +
Digital Display +
Digital Input +
Digital Output +
Display Colour +
High Speed Inputs +
Input Signal +
LCD Display +
Leakage Current +
Module +
Neutral Loss +
Output Signal +
Over Frequency +
Over Voltage +
Phase Asymmetry +
Phase Loss +
Phase Sequence +
Reset +
Sensor Supply +
Series +
Settable Off Delay +
Settable On Delay +
System +
Transistor Output +
Under Frequency +
Under Voltage +
Voltage +
Voltage Monitoring Relays play an instrumental role in managing a plethora of voltage-related issues. These devices are great at detecting voltage parameters and can efficiently handle typical issues about them like:
- Phase Loss
- Phase Sequencing
- Over Frequency
- Under Frequency
- Neutral Open
- Phase Asymmetry
Their primary role is to offer both under-voltage and over-voltage protection. Under-voltage is a situation that occurs when the average voltage of a 3-phase system falls below the intended level. Most electromechanical devices with 3–phase motors are known to function at specific voltage levels. If for some reason these devices run at low voltage levels, they’ll demand more current.
This sudden increase in current can have devastating consequences. The increase in current is accompanied by a sudden bump in heat inside the winding coil, resulting in the critical insulation taking damage. Without competent under-voltage protection, you basically have an electromechanical equipment that won’t last long. Simply put, an under-voltage protection system is imperative to extending the life of an electromechanical device.
Over-voltage protection, on the other hand, is a system that cuts off power-supply when pre-set levels of voltage is exceeded. Many things from heavy interruption of loads to lighting and switching impulses can cause an over-voltage problem. Similar to under-voltage issues, over-voltage can also end up damaging the insulation that protects the entire system.
In hindsight, both overvoltage and under voltage protection systems have significant impact on the speed, efficiency, motor, and output torque of a device. Needless to say, they are both essential for the smooth functioning a system.
Applications of a Voltage Monitoring Relay
- UPS
- Auto Mains Failure Panel
- Battery Charger Panels
- Generator Set Panels
- Inverter Panels
- IDC Drive Control Panels
As we mentioned before, over and under voltage protection aren’t the only benefits that a voltage monitoring relay renders. Such devices can also help you deal with Phase unbalance or phase asymmetry issues. This situation occurs when one or multiple line to line voltages do not match with each other. This results in unbalanced voltage, which leads to unbalanced current inside the motor winding. If this happens, the temperature of the windings will also increase.
Phase asymmetry can be caused due to an unbalanced transformer bank, an unstable utility supply, or because of unevenly distributed loads on the same power system. A voltage monitoring relay can protect the motor from damage because of phase asymmetry by turning off the equipment as soon as such an issue is detected.
Another issue that a voltage monitoring relay can be effective against is phase loss, which occurs when one out of the three phases is lost. Phase loss can happen because of a broken wire, thermal overload, mechanical failure, or worn contact. If phase loss transpires, motors, compressors, and pumps with 3 phases will consume excess current.
This could result in the device becoming overheated and therefore unsafe. A good-quality voltage monitor relay will protect the system from damage in such a scenario by immediately switching the equipment off as soon as a phase loss is detected.
Sometimes voltages are attained at their maximum positive value. When this happens, it is called phase sequence. When it comes to a three-phase system, each of the three voltages should fall within the same magnitude while ensuring the frequency is displaced electrically by an angle of 120 degrees.
If any of the coil phases are named R, Y, B, then the positive phase sequence will be BRY, RBY, YBR. A voltage monitoring relay can detect such a fault.
Key Features of Our Voltage Monitoring Relay
- Overvoltage and under voltage protection
- Phase sequence, phase loss, phase asymmetry protection
- Protection against under and over frequency issues
- Protection against neutral open.
- Configurable Relay Outputs
- Protection: IP20 and IP40
- Adjustable Trip Time delay
Frequently Asked Questions
GIC offers a wide range of 145-500 VAC across all digital undervoltage protection series.
Digital undervoltage/overvoltage relay can be configured for 3 Phase 3 Wire or 3 Phase 4 Wire systems.
GIC offers a Trip setting range as below:
- Under Voltage : 55% to 95% (of Supply Voltage)
- Over Voltage : 105% to 125% (of Supply Voltage)
The function of a voltage relay is to monitor and protect electrical machines/motors against abnormal supply conditions to enhance its life.
A 3-phase voltage monitoring relay continuously monitoring the voltage levels of each phase in a 3-phase electrical system and provide protection against voltage-related issues such as overvoltage, under voltage, phase imbalance, phase reverse and phase loss.
Undervoltage protection is used to safeguard electrical equipment and systems from damage or malfunction caused by excessively low voltage levels.
The two types of protective relays are Single Phase and Three Phase relays.
An insulation monitoring device is a device that continuously monitors the insulation resistance of electrical systems/machines with respect to Earth and alerts operators or triggers alarms if insulation faults or degradation occur.
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Insulation monitoring devices are used in various electrical systems and installations, including power distribution networks, industrial plants, hospitals, data centers, and renewable energy systems where neutral is not grounded at the Supply side which is called an Unearthed IT system.
Frequent Searches for Voltage Protection Relay
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