Every electrical system needs reliable backup power, safety, and fault detection. To ensure this, three major components are madatory to ensure workplace safety.
They work together to safeguard, prevent, and power your systems, ensuring that everything operates smooth.
Leakage currents is closely tracked with Earth Leakage Relay (ELR) with core balance current transformers (CBCT/ZCT), which automatically isolate by triggering MCCBs, ACBs, OCBs, or contractors when the threshold is exceeded.
These provide a digital display of leakage currents in real time and are made to withstand fluctuations and harmonics. Perfect for commercial and industrial settings where accurate monitoring is required.
These are ideal for basic leak detection in a variety of settings and offer dependable protection through the use of static components.
These are some of the systems and environments where ELRs are essential for fault detection and protection.
Use this checklist before configuring your ELR system to guarantee dependable operation and security.
Because they have a smaller current magnitude than phase faults, earth faults are sometimes overlooked, yet they can have an equally disastrous effect. The earthing technique and fault impedance have an impact on these failures, therefore precise identification becomes critical in utility and industrial settings.
Earth Fault Relays (EFRs) guard against leaks to the earth by using specialized CTs to continuously monitor any remaining current. Key assets like transformers, feeders, and generators are protected by these relays, which are designed to identify faults even in high-impedance situations and isolate the circuit with a precise trip signal.
EFRs respond to ground faults by sensing current imbalances using Neutral or Summation CTs. Depending on the model, the relay operates in one of three modes:
Generally, trip thresholds are set between 5% and 80%. The relay functions according to predetermined features, assuring prompt disconnection in the event of any problem.
These relays are designed to be accurate, adaptable, and long-lasting. Here is a brief overview of the key technological characteristics.
Systems that require protection from low-level earth faults are best suited for earth fault relays. These use cases show where they fit perfectly.
A few setup guidelines must be addressed to for both safety and efficient functioning.These simple checks help ensure proper integration and performance.
Microprocessor-Based Static | Model: MPREFR | Trip Range: 5%–80%
The Digital Microprocessor-Based Restricted Earth Fault Relay (REFR) is a specialized protection device crafted for low, medium, and high voltage systems. It is essential for protecting against large impedance differentials, particularly in generator differential schemes and confined earth faults where selectivity and accuracy are crucial.
By identifying fault currents that are below the threshold of conventional protection relays, the REFR is designed to protect designated zones, usually generator neutrals or transformer windings. Within confined spaces, it responds quickly and precisely, providing reliable protection without tripping for outside issues.
In high impedance differential schemes, the REFR monitors circulating current to determine if a fault is internal. Despite being technically equivalent, CTs may behave differently during severe through-faults due to asymmetrical and high-magnitude currents.
This can result in a false trip due to CT saturation. In order to overcome this difficulty, the REFR is made to precisely detect the ensuing imbalance currents and only react when absolutely required.
Our Over Current and Earth Fault Relays protects medium voltage networks, whether they are impedance-earthed, resistance-earthed, or solidly earthed. Developed on microprocessor-based platforms with sophisticated protection logic, these numerical draw-out relays offer accurate fault detection and dependable, quick reaction in various fault scenarios.
Relays in the range have one to three overcurrent elements and optional earth fault components, which can be used in both directed and non-directional applications. High-set and low-set protection can be independently enabled, supporting IDMT, definite time, and instantaneous characteristics to suit radial or interconnected systems.
Every relay may be easily integrated into SCADA or energy monitoring systems because it is compatible with RS-485 connection via the Modbus protocol. Up to 99 fault records are internally saved, and fault and event logging with time stamping aids in monitoring system behavior under critical circumstances.
Select models offer auto reclosure with programmable logic, customizable DO/DI mapping, and selectable relay latching or pulsed output modes. In temporary faults, these capabilities lessen the need for manual intervention and give further control over system recovery.
The purpose of our microprocessor-based motor protection relays is to protect motors with up to 75 horsepower. Smart protection against overloads, phase failures, and unusual operating conditions is offered by these DIN-mounted units with real-time temperature modeling and continuous current monitoring.
The relays do not require external current transformers within the designated current range because they have built-in current transformers. Simply run the R, Y, and B cables through the device; the rest is taken care of internally for quick and precise current detection.
The relay determines the motor's thermal condition and trip timing using advanced algorithms. By promptly shutting down during overloads or faults, this helps prevent damage and maintains the safety and effectiveness of your operations.
Found in a wide range of applications across industries. Here are a few:
A more advanced numerical relay version is also offered for HT applications, providing complete protection for generators, feeders, transformers, and motors in a single, small, smart device.
Our microcontroller-based APFC Relay automatically adjusts and maintains your system's power factor. Built on RISC architecture, it handles dynamic load changes intelligently without requiring manual switching sequences.
With its industrial-grade back-lit LCD, the machine provides continuous online line PF monitoring, enabling operators to see in real time and improve power quality control.
Using a proven intelligent algorithm, the relay selects the best capacitor bank combination in the shortest time possible, ensuring efficient correction even in rapidly changing load conditions.
Users do not need to set up complex switching sequences because the system is completely automated. The relay's adaptable and integrated logic makes it perfect for new or existing systems.
APFCR stands for Intelligent Automatic Power Factor Controller. Relays such as this are commonly utilized in:
Looking for reliable voltage protection in your power systems? Our microcontroller-based Numerical Voltage Relay ensures accurate and timely protection against voltage abnormalities with advanced digital intelligence.
Do you require advanced supervision? The PNVNSP-CS model consists of:
A line voltage monitoring relay is intended to provide accurate protection against overvoltage (OV) and undervoltage (UV) in 3W/4W polyphase systems. With its broad voltage setting ranges, robust signal conditioning, and definite-time tripping logic, the LVM series provides dependable supervision for precise operation in industrial power networks.
This digital relay safeguards generators against reverse power flow. It has a broad detecting voltage range, dependable relay output, adjustable trip levels and time delays, and is designed to detect reverse current circumstances with high precision. It is perfect in power systems where generator back-feeding must be prevented.
Engineered for reliability, these are the places where it’s regularly put to work:
Find Phase Problems Before They Get Out of Hand
Unbalanced voltage or missing phase? These minor difficulties might result in big problems like engine damage or equipment shutdowns. To keep your systems safe and operational, Prok dv's Static Phase Failure Relay (PFR) and Single Phasing Preventor (SPP) detect phase loss early on by using negative sequence voltage.
This relay continuously monitors your incoming power source. It uses a tried-and-true technique called negative phase sequence detection to detect imbalanced voltages or missing phases. When something is off, it responds quickly, without damage or delay.
Static-type protection relays called LV Voltage Relays recognize and react to unusual voltage levels in electrical circuits. They provide a small, DIN rail-mountable solution for monitoring and safeguarding systems against over-voltage (OV), under-voltage (UV), phase failure (single phasing), phase reversal, and voltage unbalance.
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These relays are designed to protect electronics against typical disruptions like:
Phase failure can result in hazardous overvoltage circumstances that damage insulation and induce burnout in motors running at low loads. Asynchronous operation of synchronous motors (at approximately 75% of their rated voltage) and induction motor shutdown below 70% are possible low-voltage outcomes. The purpose of these relays is to identify these variations and initiate prompt protection.
These relays come in a variety of models (VD02, VD03, VD04, VD05, VD06, DMPVR-03, MPVR-03, and VM-2D), each of which is appropriate for a particular set of system requirements and application areas. All variants provide strong protection in the following areas and are tailored for panel mounting:
Intelligent Guarding Against Frequency Variability
The HILO-2C Frequency Relay is designed to operate dependably in crucial power configurations like captive power plants and generators. It provides accurate over-frequency and under-frequency protection to protect vital electrical components from malfunction or mechanical damage caused by unstable frequencies.
This relay is a reliable backup to mechanical over-speed protection devices when generators exceed frequency restrictions, protecting the prime mover from harm. Conversely, under-frequency protection guarantees field winding safety and regulator overload protection during a frequency drop, which is crucial during load shedding or unstable grid conditions.
Applications Where Frequency Control Can’t Be Compromised
Whether it's protecting generators or sensitive control equipment, the HILO-2C provides a quick, accurate response to prevent costly breakdowns and ensure smooth operation.
The purpose of this microprocessor-based relay is to guard against imbalanced voltages in critical electrical systems. It continually checks all three-phase Line-to-Line voltages using zero-sequence voltage detection. In order to prevent harm to connected equipment, the relay trips depending on a predetermined threshold and time delay if abnormal conditions are detected.
The device is sophisticated and easy to use for real-time monitoring and system protection since it has a clear LCD for voltage readings and LED indications to display Healthy or Trip/Fault status.
This relay is highly regarded in the industry and is perfect for:
A multipurpose protection relay, the PDTPR series is made for transformers, motors, feeders, and generators. It provides quick, dependable monitoring and protection all in one little package.
This sophisticated numerical relay covers essential protective features required for critical applications and guarantees precise fault detection.
Auxiliary relays in the PAR series are voltage-operated relays frequently seen in control and alarm circuits. The PAR-H model has hand reset contacts, whereas the PAR-S model has self-reset capabilities.
Both two and three element combinations are available for the models, and each element can be activated separately.
A sturdy electro-mechanical hinged armature mechanism ensures reliable magnetic and electrical performance in this lockout relay. Sturdy and dependable materials are used in the construction of the armature, yoke, and core.
The coil can withstand both brief overloads and sustained operation thanks to its high thermal-rated wire. A quick-acting series break contact efficiently stops inductive currents during fault conditions by guaranteeing that power is switched off within 10 ms.
A small size and effective performance are made possible by the flyback topology used in the design of this switch mode battery charger. By achieving over 80% efficiency with a high switching frequency, the charger minimizes heat loss and component footprint.
With feedback-controlled switching, the input voltage is changed at a high frequency, precisely regulated by opto-isolators. To maintain low ripple levels, the output is rectified and then filtered using smoothing inductors.
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