Nissi

Higher Reliability:

It can be readily taken into the memory of another PLC once the program has been written and tested. Compared to conventional hardwired circuits used, it requires less and simpler cabling. The reliability of the scheme with PLCs therefore improves considerably. 

More Flexibility:

Compared to hardwired circuitry system, creating a new program module or changing an existing program in PLC is easier. These modules of the software program can be altered whenever necessary. Use can modify the programs in the field and, if necessary, enhance security through hardware interlocks such as key locks and software features such as passwords.  

Lower Cost:

Originally designed to replace relay control logic that is not cost-effective and complex, particularly for large control circuits. With PLCs, cost savings were so significant that, with the exception of some power applications, the relay control becomes uneconomical. Generally, if the application consists of more than half a dozen control relays, installation of PLCs is less expensive.  

Communication Capability:

PLC's communication capacity with the other system controllers and pcs is one of the major benefits compared to the relay control circuit. Functions such as monitoring, field data acquisition, monitoring devices and field-related process parameters and downloading and uploading programs with the PLC can easily be compared to hardwired circuits 

Faster Response:

PLCs are designed for high speed and real-time applications. Compared to relay logic circuits, the response time for PLCs is much smaller. The programmable controllers work in real time, i.e. an event that takes place on the ground will result in the operation of the output. 

Easy to Troubleshoot:

The circuit breaker must first be switched off and then isolated from both sides by opening the electrical isolator concerned to maintain the circuit breaker or circuit breaker.

At this no isolated condition, the circuit breaker must be operated annually and when necessary for local and remote condition. The circuit breaker should be operated electrically from the local and distant and then mechanically from the local. This kind of operation makes the breaker more reliable by removing any coating produced between sliding surfaces.

Bulk Oil Circuit Breaker Maintenance :

We should test for contact burning for the bulk petroleum circuit breaker. Remove the burning beads and polish the surface if burning is very light. If it is quite heavy to burn, substitute the tips and arcing ring with a fresh set. Before the final binding is finished, we should loose and close the tips a few times.

 We should also inspect the extinguishing chamber on top of that. It must be separated from the breaker unit and maintained as upside down after washing the chamber by insulating oil. If any sections condition suggests serious burning, the chamber should be dismantled and the burned / damaged parts replaced.

 The next point is the CB system for cleaning and lubricating. Non-fluffy cotton cloths should remove the rust on the system and also from the metal mechanism box surface. High grade grease should lubricate the system including gear wheel. But it should be remembered that it is necessary to lubricate the friction clutch. If the minimum oil circuit breaker MOCB is used, the insulator must be washed and the carbon deposition must be removed if Trichloro Ethylene or Acetone is used to remove any. In addition to this overall guidance, the handbook supplied by the manufacturer for greasing and lubricating should also be followed.

The tie rod locking pins should be inspecte dsemi-annually. All the electrical terminal connections of the foundation bolts at the CB energy circuit have to be correctly tightened after removing the oxide coating if not. This has to be performed six months a year.

The right adjustment of the auxiliary switch by ensuring right NO NC connections at breaker OFF and ON condition must be verified half-yearly and the contacts of the auxiliary switch should be correctly washed with the assistance of tough brushes.

The engine and mechanism for spring charging should also be washed and the related bearing should also be lubricated half a year.

Minimum Oil Circuit Breaker Maintenance :

The breaker should be monitored monthly for oil leakage and oil concentration in the event of MOCB. If oil leakage is discovered, care must be taken and oil must be added to the point of willingness for low oil level.

 Visual inspection of the circuit breaker and its working mechanism together with painting quality, mechanism kiosk door gasket should be performed quarterly if proper action is taken by any damaged found.

If leakage is discovered, substitute the faulty and damaged O-rings, the oil dash pot in the working system must be checked quarterly for oil leakage.

It is also strongly recommended to guarantee annual reclosure of the breaker's prescribed duty cycle of operation.

Maintenance of Air Blast Circuit Breaker:

In addition to general instructions for maintaining the working system, there are some unique cares to be taken for air blast circuit breaker. In fact, the maintenance methods and plans are the same for all oil circuit breakers, air circuit breakers, SF6 circuit breakers and vacuum circuit breakers for working systems and other characteristics.

The air leakage should be verified as and when needed in the air circuit breaker. If there is a leakage, plug the leakage.

It is necessary to check the grading capacitors for monthly oil leakage. If there was a leakage, plug it. With the assistance of Dew Point Meter or Hygro Meters, the dew point of the working air at the air dryer outlet should be evaluated annually.

 SF6 Circuit Breaker Maintenance:

 As we said previously, maintenance procedures and schedules are the same for all oil circuit breakers, air circuit breakers, SF6 circuit breakers and vacuum circuit breakers for working systems and some other characteristics. Besides that, some additional care must be taken in SF6 CB.

 It is necessary to check the SF6 circuit breaker for SF6 gas leakage if there is an unwanted low gas alarm. This is performed effectively by detecting gas leakage.

If gradient condensers are supplied to the circuit breaker, these must be inspected monthly for oil leakage. If there was a leakage, plug it.

Dew point of SF6 should be inspected at every 3 to 4 years interval with the assistance of dew point meter or hygro meter.

The Control and Relay panel is a combination of protection relays, metering devices and another specific item which is able to work as a shield guard for all substation equipment and the electrical network where it is the most important equipment of the substation. Control and Relay panel is mainly used to control the flow of electricity as per the Voltage class and detect the faults in transmission lines. CRP is mainly designed mainly to control & monitor the electrical equipments such as transformers, generators and circuit breakers which are used for generation protection and control of power distribution system.

In this panel, forms of numerical & electromechanical relays are installed to provide damage protection to instrumentality. The panels contain elements meters, control switches and recorders located in the control building also called a doghouse. These are elements which are mainly used to control the substation equipment, to send power from one circuit to another or to shut down circuits when needed.

Actually, the relays are selected by NISSI expects based on the needed as per the requirements of the customer for their protection system. Where the interior system of the panel consists of the mounting framework for the system of relays, current supply, and the optional automation modules. Where the panels are not only used in substation but also plays an essential in the industrial and commercial sector where power consumption is very high. Those relay panels are widely being manufactured as per international standards which is well compatible with SCADA application.

We know that substations are the building blocks of the power grid. NISSI has been automating those substations with the highest interoperability, and providing grid operators and owners with the highest efficiency and increased productivity. Without sufficient protection, those substations can quickly come tumbling down. NISSI has been preventing that happening successfully with protective relays and breakers connected over bulletproof telecommunications.

 In this Modern world, the automation of the substation is digitalized so that we can increase controllability, facilitate the integration of intermittent renewables and improve safety by replacing copper cabling with fiber optics. NISSI Grid Automation enables the digitalization of the grid so that our customers can improve reliability and ensure a safe and clean energy supply to their consumers.

 Our SAS commissioning includes services such as the design of system architecture, hardware & software recommendations, supply of hardware & software requirements, database creation, ethernet switch configuration, commissioning of BCU, BCPU, and PMU, web hosting and FTP configuration, controllers communication through OPC protocol construction, HMI & Gateway configuration and SAT- Point to Point Testing.

 Relay Testing – Testing the relay is managed in different ways, but the goal is to prove the relay settings, relay logic, and relay functions are all working to “asset” settings, Element testing can be accomplished via manual or automatic testing and Strive to test relay logic with real dynamic testing

SCADA stands for supervisory control and data acquisition is a category of the software application program for process control and real-time database also collected. In the industrial process such as production, manufacturing, development, maintaining, and fabrication where SCADA systems are used to monitor, control and communicate the above functions in industries and companies in the public and private sectors. SCADA also used in power plants as well as in oil and gas refining, telecommunications, transportation, and water management. The SCADA system also takes the reading of the meters and checks the status of sensors in regular interval.

Hardware and software components are included in  SCADA system where the data are gathered by hardware and data are sent to the computer where the SCADA software installed, where it also used to records and logs all events of the hardware.

SCADA also warn when the condition becomes hazardous by sounding alarms Effective SCADA systems can result in significant savings of time and money.  Where there are numerous case studies which had been published and highlighting the benefits and savings of using a modern SCADA software solution such as Ignition.

The Birth of SCADA:

SCADA origins tell that it was introduced in the mid-20th century, many manufacturing floors, industrial plants, and remote sites relied on personnel to manually control and monitor equipment via push buttons and analog dials.

In the Electrical field, both the testing and commissioning show their paramount role, where testing is extremely essential for precautionary as well as disintegration maintenance. So that every Electrical company first concentrates on the testing team armed with modern instruments, which conducts tests with efficiency, accuracy, reliability, and repeatability. The teams are strong in their technical training and they are equipped to thoroughly and reliably test all the installations in a switchyard and transmission line in a substation.

At the finalization of the electrical installation works, the contractor of the installation service should be exposed to the test before placing the service under the full responsibility to clients and testing should be carried out in obedience with  IEE  regulations. After the process of testing, an electrical team moves to commission process which is the systematic process to verify the function in consonance with the design resolved and owner's operational requirements for assuring the installed components which they tested and commissioning process not only for new projects but also to current units and systems subject to renewal.

Testing and commissioning require attention in many areas because many faults appear due to underground fault location, resolving earthing issues, timing tests, functionality checks, protector or testing, cable testing and lots more. The professionals make sure that each put in a product is totally tested to figure efficiently and guarantee glorious performance. The running of the installed electrical equipment is simply based on sample work of the equipment during testing and commissioning.  

Operation and Maintenance Agreements (“O&M agreements”) play a crucial role within the power and energy merchandise wherever the lifetime of merchandise area unit quietly supported the upkeep of the merchandise. wherever the upkeep ought to be routine to extend the merchandise lifespan.

In Project contracts, the Operation & Maintenance Agreements used to be among the more meager documents. Operation & Maintenance agreements accustomed be among a lot of insignificant documents among the project contracts. From a document which frequently solely turned in negotiations in spite of everything the opposite documents were mentioned, the Operation & Maintenance agreements have very come back aged and area unit the put attentiveness of assorted services delivered to comes and alternative organizations. this is often but obvious since if the project involved isn't properly operated and maintained, no income is often expected of constant. Basically for comes with service delivery motive, a well-backed Operation & Maintenance is essential to the graceful functioning.

Operation & Maintenance of the merchandising equipment should be periodic where their cost is figured out for several years and are calculated in opposition to the cost of installation for new things than think about the profit percentage. Operation & Maintenance division, which takes productive and corrective maintenance services for the merchandise where the services for their client and the team should offer monthly reporting or yearly reporting on generation and activities, to retrieve and manage generation data along with project commissioning expertise after the amount to various analyses of the merchandising equipment with their performance.