In utility and industrial electric power transmission and distribution systems, a digital protective relay is a computerbased system with software based protection algorithms for the detection of electrical faults. Plant engineering microprocessorbased relays offer. Microprocessorbased distribution relays contribute to improved reliability and reduced costs on electric power systems. Microprocessor based relays, also called digital relays, have a proven track record of reliability, with over 100,000 relay years of field experience. The proposed set of actions for the unification of software platforms of the modern, microprocessorbased relay protection test systems will enable examination of. It combines lightweight, modular portability with highcurrent output capacity and maximum testing flexibility. Understanding microprocessor relay logic basic digital logic. Administrative rights to install software must be granted for successful course completion. What to check varies depending on the type of relay, whether electromechanical, solidstate, or microprocessor based. Hello everyone, i would like to ask everyones opinion and references on the frequency of testing microprocessor based and solid state relays. Nov 08, 20 this is a recreation of the first paper i ever presented from the neta conference in 2001 that was the foundation of the relay testing handbook series. Similarly, the output of a logic function is activated, that is, high or deactivated, that is, low. Procedures for each type of relay are summarized below.
Inspections and checks for microprocessorbased relays. He is also the author of the relay testing handbook series and founder of valence electrical training services. A microprocessorbased inrush restrained differential. Ps9116 microprocessorbased circuit breaker test sets. We provide yearround training on our products and general relaying principles.
Microprocessor based relay testing, generation peterson holding. Oct 14, 2014 in the event of a fault, relays safeguard electrical systems, equipment, and people from serious damage and injury. While this provides a means of standardized testing for a given microprocessor relay, it still requires that the logic settings are properly set to operate the intended output contacts. Better relay testing enoserv delivers software to help power companies meet the challenges of relay testing in todays time sensitive regulatory environment. This power system simulator performs the simplest through the most complex tests. Utilities and industrial facilities are increasingly investing in microprocessor based relays or intelligent electronic devices ieds to replace aging or defective electromechanical devices that provide this protection. The general software package contains the common used modules which can meet the general relay test requirement. Enoserv rts software effectively test relays and then produce documentation of the testing event according to the parameters of your maintenance and testing program. Another important advantage of the microprocessor based relay is that a microprocessor unit can perform the retransmission operation of several systems.
An avo representative will contact you to complete your registration process. Microprocessorbased relay testing, generation mbrtg microprocessorbased relay testing, generation. For full automatic testing the smrt33 may be controlled by megger advanced visual test software avts. Operation, maintenance, and field test procedures for protective relays and associated circuits iii acronyms and abbreviations a ampere ac alternating current amp ampere ansi american national standards institute bes bulk electric system carma capital asset and resource management application ccvt coupling capacitor voltage transformers co 2. Application guidelines for microprocessorbased, highimpedance bus differential relays stanley e. The space requirement for the microprocessor based relay scheme is much less than the electromechanical relay scheme 5, 6. Compared to the solid state relay, the digital relay takes the advantages of the development of microprocessors and microcontrollers. If the circuit to be tested is in service, one relay at a time should be removed if applicable so as not to totally disable the protection. The multiple protection function of todays protection relay systems requires a new level of sophisticated test hardware and software to completely analyse the operation of the unit in a real life situation. Understanding microprocessor based relay logic part 3 youtube.
A microprocessorbased scheme for testing protective relays. Most microprocessorbased relays perform routine selfchecks to ensure that the critical circuitry in the relay is functioning properly. Application guidelines for microprocessorbased, high. Microprocessorbased protective relays applications in.
For this purpose, a floating point arithmetic software package is used. They are functional replacements for electromechanical protective relays and may include many protection. Test requirements formicroprocessor relays chris werstiuk manta test systems 2. This paper describes a multimicroprocessor based distance relay implementation. The doble f6150e is a versatile protective relay tester for testing relays and schemes.
Each of these packages contains different tests for different users needs. Another important advantage of the microprocessorbased relay is that a microprocessor unit can perform the retransmission operation of several systems. Microprocessorbased generator protection relays are now used to protect many generating systems. Multifunction relay testing considerations testing occurs at many stages. Microprocessorbased relay testing, generation avo training. This handson course is designed for test technicians and other persons involved in setting, testing, and diagnosing microprocessor based relays that protect generators, generator buses and transformers. Enoserv software and services makes workers faster, enabling you to meet testing deadlines in less time. Microprocessorbased relays are now an integral part of many power distribution systems. The multiampmegger epoch10 relay test set integrates advanced microprocessor based technology with decades of experience in the application, design and manufacture of equipment for calibrating protective relays to provide an extremely accurate, versatile and easytouse relay test set. Commissioning microprocessor based ied communication.
The enoserv rts backupmerge utility is a high speed. Microcontroller based protective relay testing system. Know what equipment is necessary to communicate with the relay. The rectangular devices are test connection blocks, used for testing and isolation of instrument transformer circuits. The smrt410d is a multipurpose, lightweight, field portable test set capable of testing a wide variety of electromechanical, solid state and microprocessor based protective relays, motor overload relays, and similar protective devices. Relay testing ieee conferences, publications, and resources. Usually the relay engineer may be familiar with the procedure of setting the relay and forcing the functions, however, the scada engineer may not be knowledgeable with the. June, 2012when ground fault or microprocessor relay testing is needed. Microprocessorbased timeovercurrent relay micro51 micro51 microprocessorbased overcurrent relays are used for phase and ground overcurrent protection in. Microprocessorbased relays, also called digital relays, have a proven track record of reliability, with over 100,000 relayyears of field experience. Power test is the software that includes all our relay testers. Element testing on a microprocessor relay often requires making settings changes and will mask the element to an unused relay output contact. Most microprocessor relays have some form of an automatic enhanced selftest and monitoring.
The smrt33 has the smart combination of high compliance voltage and high current to test all electromechanical, solidstate and microprocessor based overcurrent relays, including high impedance directional ground overcurrent. Meeting all your protective relay testing needs, the f6150e is available in different configurations. Our technicians perform testing based on the maintenance recommendations from. It comes with high power, sophisticated software, and great flexibility that.
Easily collect and disclose nerc prc005 compliance data. The advanced software package contains the optional modules for specific test purpose. Two earlier papers i 2 describe microprocessorbased relay testing philosophies and selfchecking effectiveness. The emergence of microprocessorbased protection, where the intelligence is implemented numerically in software algorithms, and the fact that different relay models, even from the same manufacturer, apply different algorithms and compensation techniques and use different terminology and notation, has made it increasingly more complicated to. This handson course is designed for test technicians and other persons involved in setting, testing, and diagnosing microprocessor based relays that protect feeder and bus systems. Basic, protection and advanced, which provides incomparable benefits for users. Plant engineering microprocessorbased relays offer extra value. Microprocessor based timeovercurrent relay micro51 micro51 microprocessor based overcurrent relays are used for phase and ground overcurrent protection in utility, industrial and commercial electrical power systems.
A microprocessorbased relay operates using software programming. The main advantage of this relay is that it is programmable. Microprocessorbased transmission line relay applications. The relay software occupies about one kilobyte of memory locations. Pdf tests of microprocessorbased relay protection devices. This is a recreation of the first paper i ever presented from the neta conference in 2001 that was the foundation of the relay testing handbook series. Model ps9116 offers the latest developments in highcurrent transformers and microprocessor based control.
With microprocessor relays, the builtin, selftesting features can be expected to. The relay can be on or off, that is, it has two stable states. Most of the modem numerical relays have provisions to detect phasetoground faults for any type of neutral compensation. Relay protection constitutes a major part of any power system that provides for continuous control of operation modes of power system elements and generates tripping commands for. Overcurrent relays, undercurrent relays, frequency relays, ground fault relays. It is known that microprocessor based relay testing has become a challenge nowadays mainly because of the increased complexity. Digital relays are the functional replacements for electromechanical protective relays and may include many protection functions in a single unit, as well as providing metering, communication, and. It allows users to test our different relay tester. Microprocessor based relay testing, generation peterson. Protective relay maintenance and testing electronic support. Following a fault, the relay can produce a report summarizing the sequence of operations prior to the event. Nov 11, 20 this is a recreation of the first paper i ever presented from the neta conference in 2001 that was the foundation of the relay testing handbook series.
Model ps9116 offers the latest developments in highcurrent transformers and microprocessorbased control. Such relays are also termed as microprocessor type protective relays. Use manufacturers software to communicate with the relay. Comparing protectiverelaying commissioning and test. Microprocessorbased distribution relay applications. Unlike the relays mentioned above, digital protective relays have two main parts. Protective relay testing and maintenance guide testguy. Microprocessor based relays are computers with preset programming using inputs. Impact of advancements on automated relay testing over checking earth fault characteristics.
Usually the relay engineer may be familiar with the procedure of setting the relay and forcing the functions, however, the scada engineer may not be knowledgeable with the process to enable or disable these functions. This paper proposes a protection strategy based on microprocessorbased relays for lowvoltage microgrids. The advent of current microprocessor technology has enabled the development of feeder management relays which do this task much better than conventional relays and provide other desirable features. The equipment and software used by our test technicians includes doble. Commissioning microprocessor based ied communication systems. Routine maintenance in a microprocessorbased relay consists of verifying that the inputs, outputs, and data acquisition system are functioning properly. Microprocessor relays are computerbased systems that utilize softwarebased protection algorithms for the detection of electrical faults. The type of testing is using a relay test set, not just the selftest feature of the relay. Type testing evaluate relay for application many complex tests acceptance testing is relay damaged or malfunctioning. Tests of microprocessor based relay protection devices. The f6150sv has the highest output current of any test set on the market all within a single box. This paper proposes a protection strategy based on microprocessor based relays for lowvoltage microgrids. Power relaying solutions provides the following engineering services for our electric utility and industrial customers. In addition, the unit includes capability to test iec 61850 devices.
Therefore, if the relay is functioning properly, the relay algorithms shall operate correctly. The doble f6150sv protective relay test equipment is a versatile solution for testing iec 61850based protection devices and schemes. Relay logic is very important to understand the microprocessorbased relay. Avo training microprocessorbased relay testing, feeder. Avo training microprocessorbased relay testing, generation. Understanding microprocessor relay logic basic digital. Automated batch processing of tests enables you to meet. Detailed discussion of system, maintenance and testing, interface and costperformance requirements is given. Utilities and industrial facilities are increasingly investing in microprocessorbased relays or intelligent electronic devices ieds to replace aging or defective electromechanical devices that provide this protection.
An microprocessorbased transformer protection 317 internal fault is also indicated if the differential signal exceeds the pickup setting for the unbiassed trip function. Application guidelines for microprocessor based, highimpedance bus differential relays stanley e. Understanding microprocessor based relay logic part 1. Operation, maintenance, and field test procedures for protective relays and associated circuits iii acronyms and abbreviations a ampere ac alternating current amp ampere ansi american national standards institute bes bulk electric system carma capital asset and resource management application ccvt coupling capacitor voltage transformers co. This video discusses how you can convert the digital relay logic found in microprocessor based relays and translate that. Microprocessor based relays are now an integral part of many power distribution systems. Zocholl and david costello schweitzer engineering laboratories, inc. Relay testing software power test software provides comprehensive functions to manage the test work. In the event of a fault, relays safeguard electrical systems, equipment, and people from serious damage and injury. This handson course is designed for test technicians and other persons involved in setting, testing and diagnosing microprocessorbased relays that protect generators, generator buses and transformers. The software has a superior user interface and has graphical display for. The protective relays that may be tested by our developed relay testing system are. Chris is an electrical engineering technologist, a journeyman power system electrician, and a professional engineer. Dynamic, transient and gps satellite synchronized endto end testing capability.
Relay testing a prototype of the inrush restrained differential relay was assembled in laboratory. Digital relays are the functional replacements for electromechanical protective relays and may include many protection functions in a single unit, as well as providing metering, communication, and selftest functions. Complete the form below to submit your course registration request. Microprocessor relays offer builtin event recorders capable of capturing and timestamping event information at one millisecond resolution. This paper describes a multi microprocessor based distance relay implementation. Feb 20, 20 test requirements for microprocessor relays 1. Measured values of phase current, ground current and voltage can be displayed. Intricate knowledge of the ied configuration software must be known. The program can handle the online calculations and make the decision accordingly. Tests of microprocessorbased relay protection devices. Operation, maintenance, and field test procedures for. Microprocessor relays are computerbased systems that utilize software based protection algorithms for the detection of electrical faults. In practice it has turned out that most mpds simply do not sense the substitution of the whole printed board of one kind for the board of other kind which is not compatible with relay current settings. Typical electromechanical relay scheme panel layout.
The worlds first commercially available digital protective relay was introduced to the power industry in 1984 by schweitzer engineering laboratories sel based in pullman, washington. Microprocessor based distribution relays contribute to improved reliability and reduced costs on electric power systems. Every facet of relay testing can be handled with the comprehensive line of relay test equipment from megger. In addition to customizing specific microprocessorbased relay capabilities, skilled integration engineers can also help utilities and industrial facilities design their microprocessorbased relay protection systems in such a way as to fully leverage the inherent benefits of the relays and maximize each relays value. Microprocessorbased digital protection relays now emulate the original devices, as well as providing types of. This handson course is designed for test technicians and other persons involved in setting, testing, and diagnosing microprocessorbased relays that protect feeder and bus systems. Neta and nfpa 70b maintenance and testing standards recommend testing relays either every 2 years or at other regular intervals based on equipment condition and reliability requirements. Further, the structure of a new relay enabling the proposed protection strategy is presented. Entering setpoints to the microprocessor based relay is.
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