Control Relay And Protection Services

In Electrical Engineering, several times we have heard the term Control, Relay and protection. But hardly we tried to understand this term and its potent influence in energy automation sector. But this time we’ll get to understand this term and its significant role.

Basically, a protection relay is a smart device that takes inputs, compares them to set points, and then outputs based on the result. Among the possible inputs are current, voltage, resistance, and temperature. This could include visual feedback in the form of indicators and/or an alphanumeric display, communications, control warnings, alarms, and switching power on/off.

Depending on the type of protection relay, it may be electromechanical or electronic/microprocessor-based. The electromechanical relay is an obsolete technology that requires routine calibration to stay within intended tolerances.

Digital technology allows microprocessors and electronic relays to provide quick, reliable, accurate, and repeatable results. In comparison to an electromechanical design, using an electronic or microprocessor-based relay has numerous benefits, including increased accuracy, additional functions, lower maintenance costs, and a smaller footprint.

In addition to the control panel, the relay panel is the most important substation equipment since it serves as a shield guard for all substation equipment and electrical networks. In addition, these panels assist in controlling the flow of electricity in accordance with the voltage class and detecting the faults in transmission lines. It is common for protection relays to have adjustable settings. A relay makes a decision on the basis of settings (pick-up levels) programmed by the user. The inputs are compared to these settings, and the relay responses accordingly.

There are numerous ways for the relay to transmit that a decision has been taken. The relay will often operate a switch (relay contact) to signify that an input has exceeded a preset, or the relay can provide visual feedback in the form of a metre or LED. The capacity to connect with a network or a PLC is one advantage of electrical or microprocessor relays.

Control and relay panels are designed and manufactured according to the utility needs, which can be divided into the following categories: -

  • Line Protection
  • Transformer Protection
  • Bus Bar Protection
  • Tie Breaker
  • Bus Coupler
  • Reactor

Numerous numerical & electromechanical relays are installed in this panel for damage protection. Aside from meters, semaphore indicators, control switches, indicator lamps, push buttons, annunciators, test blocks, and test plugs, major equipment is also installed based on design specifications.

A control and relay panel are designed and manufactured based on the voltage class of a substation, such as 11KW, 33KW, 66KW, 132KW, 220KW, and 400KW, for example. However, DC voltage or supply voltage may vary depending on the panel requirements, such as 30V DC, 110V DC, 220V DC, etc.

Different Types of Protection Relays

Different types of protective relays are available. The following are the most prevalent and important types of protective relays:

  • Electromechanical relays - Electromagnetic relays were the first relays invented, and they are still in use in many places today. In most cases, an electromechanical protective relay can only handle two performance metrics or protective duties. More complicated electromechanical relays (that operate depending on changes in electric electromagnetic forces) may also be provided.
  • Overcurrent Relays - The overcurrent relays could be triggered by the current. When the current measurement and amount surpass the pick-up value, the relay may start to operate. The time relay and the instantaneous relay are two types of relays that are regularly available on the market.Both of these relays are frequently seen in relay systems. One disadvantage of an overcurrent relay is that it may detect current fluctuations and faults in neighbouring zones.
  • Directional relays - Current flowing in the opposite direction can enable the directional relays. It might be able to detect a discrepancy between the reference and actuation currents. The polarising amount is also known as the phase angle of difference. The directional relay can be used in conjunction with another relay to improve the protective relay system's selectivity and capability.
  • Differential relays - A differential protective relay may operate by comparing the amount and values of the "incoming" and "exiting" currents. If the difference is greater than the pickup value, the system may be disconnected and the breaker circuit activated.
  • Distance relays - A distance relay may operate by determining the change between the system's impedance and the current differential between the faulty and installed locations. It may react to variations in the voltage-to-current ratio. The relay is frequently used to protect transmission lines.
  • Pilot Relays - The pilot relay can be used to detect whether a problem is on the protected line or not. The system's pilot, or communication channel, can convey information between the terminals. Depending on where the problem is located, the system's next step may differ. When a failure occurs outside of the protected line, the system's circuit breaker is blocked or disabled. The circuit breaker is tripped when an issue occurs inside the protected line (or within the system).

A control & relay panel is not only used at substations that belong to and are operated by electrical utilities, but it is also indispensable in commercial and industrial sectors with high energy consumption. Today's Control and Relay panels are made according to international standards with strict adherence to the IEC-61850 protocol for communication, which is well suited with SCADA applications.

For substations, there are two types of control panels available:

  • Simplex type
  • Duplex type

All control and relay instruments are equipped/mounted on the same panel in a simplex type panel. Control and relay units, on the other hand, are installed individually in duplex type, with relays in the relay section and other equipment in the control section such as metres, switches, semaphores, annunciator, signalling lamps, and push buttons.

For what a Protection Relay is used?

As previously stated, power system protection relays can help protect an electrical system from problems. The system is capable of detecting and locating problematic problems and electrical lines, as well as automatically initiating protection measures and control circuit activities.

Nowadays, protective relays can be made up of a number of different relays. These relays may also have various types of actuators and control various components of the system. A system's relay may respond to specific inputs, and a combination can deal with a wide range of challenges and conditions.

Technitab Solutions developed the capacity for complete Engineering & designing of the Control & relay panel. We had worked with various EPC’s and Various State Electricity Boards for their 110Kv to 400Kv projects.

Control Relay And Protection Services

We give consultancy services for designing better and efficient Protection & Automation systems with better technological advancements. This includes but is not limited to

Protective Relays Services And Settings Capabilities

  • Design of Protection Scheme
  • Panel Design and Layout
  • Relay Integration and Configuration
  • Protection System Integration
  • System Study and Feasibility analysis for Automation of Old / Existing substations
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We design, assemble, supply, integrate test, and commission different types of Relay and Control Panels required for Generation, Transmission, Distribution, and Industrial applications.

Generating Station

  • Generator Protection
  • Excitation Control
  • Motor Protection
  • Generator Transformer Protection, etc.

Transmission System (up to 765kV)

  • Line Differential Protection
  • Distance Protection
  • Transformer Protection
  • Tie-breaker Protection
  • EBus coupler & TBC protection
  • Bus-bar Protection
  • Synchronisation Panel
  • Feeder and Auxiliary protection
Control Relay And Protection Services
Control Relay And Protection Services

Distribution System

  • Feeder Protection
  • Transformer Protection
  • Motor Protection

Industrial Application

  • Feeder Protection
  • Transformer Protection
  • Motor Protection
  • Capacitor Bank Protection
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Our CRP Projects

To be successful as an Engineer, you should have a growth mindset and a commitment to technical learning. Outstanding Engineers are highly observant, willing to assist others wherever possible, and eager to readily take up leadership initiatives.

  • Understanding project requirements and completing all duties assigned by the Supervisor.
  • Taking notes and sharing your findings with your Supervisor and other relevant stakeholders.
  • Shadowing senior staff members, asking questions, and assisting wherever possible.
  • Raising concerns and making suggestions for improvement where appropriate.
  • Conducting technical research and traveling to sites.
  • Observing health and safety regulations at all times.
  • Establishing professional relationships with colleagues & clients.
  • Maintaining a high degree of professionalism and diligence.

Our team Projects and Testing

Technitab is an Energy Automation Services Company that offers Automotive Relay Tester, PLC Scada for Electrical Engineers Service in Delhi, India.

Our Typical Projects

  • Testing and Commissioning of Grid Islanding protection Schemes including MiCOM P341, P632,and P111 relays
  • Testing and Commissioning of 11kV/415V distribution Transformers, PCC panels and power cables
  • Testing and Commissioning of 220kV Switching Station and Protection & control panels
  • Testing and Commissioning of 33kV/6.6kV 13 substations, Oil wellpads and 415V PMCC panels
  • Testing and Commissioning of 132/33kv Switchyard and furnace transformers, 33kV indoor switchgear panels
  • Configuration, Testing and Commissioning of Areva make MiCOM P632, P341 and P127 Relays
  • Testing and commissioning of 220/132/33 KV Switchyard
  • Configuration, Testing and Commissioning of MiCOM P441, P632, and P111 relays
  • Factory Acceptance Test (FAT) of Generator Protection Schemes including ABB make RAGEK relays
  • Factory Acceptance Test (FAT) of Line & Transformer Protection Schemes including ABB make REL 670, RED 670, RET 670
Control Relay And Protection Services
Control Relay And Protection Services

Tools And Infrastructure

  • VARIAC – 10 A, 15 A, 28 A

Our regular testing tools

Technitab is an Energy Automation Services Company that offers Automotive Relay Tester, PLC Scada for Electrical Engineers Service in Delhi, India.

 1kv Megger Control Relay And Protection Services 1 phase Relay kit -Control Relay And Protection Services Fluke Tester - Control Relay And Protection Services Clamp tester - Control Relay And Protection Services DC Power pack -Control Relay And Protection Services Variable AC tester -v Tester - Control Relay And Protection Services Tester - Control Relay And Protection Services Insulation Tester - Testing & Comissioning tools Leakage Tester - Control Relay And Protection Services

The Bottom Line

A malfunction or unfavourable change in variables such as voltage and current, among others, can cause the electrical system to fail and cause other problems and issues.

Protective relays ensure that such interferences and damages do not occur, and that the damaged circuit component and system are completely separated from the rest of the system. In the event of an electrical failure, the relay can reduce the amount of damage to electrical components and equipment.

If you want a seamless and trouble-free electrical service and consumption experience, make sure your electrical system has protection relays installed.

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