When a protective relay trips the electrical distribution system, it can cause equipment to shut down and the plant to go offline. Relay settings at all new protective relay installations, the re lays should be adjusted in accordance with the settings given in the relay data sheets furnished by the denver office, after which, tests should be made to determine if the actual operating characteristics check with the adjustments. Pdf mv switchgear protection relays inspection and test procedure find, read and cite all the research you need on. The creators of these relays were true geniuses as they were able to apply their knowledge of electrical systems and protection to create protective relays using. To shorten testing and commissioning times of siprotec relays, extensive test and diagnostic functions are available to the user in digsi 5. In the case of a recent relay development project, it was found that if one person had to complete all the work, it would take 4 years to write the functional typetest. Proper power plant training prepares operators to handle protective relays quickly and effectively, minimizing downtime. Applications range from classic panel built control systems to modern interfaces between control microprocessors and their power circuits or any application where reliable galvanic separation is required between different circuits. Instrument transformers correlation to drawings one lines ac schematics dc schematics. Auxiliary relays are used with protective relays to complete a protection and control scheme. Operation and maintenance of protective relays and. In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected 4 the first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as overcurrent, overvoltage, reverse power flow, overfrequency, and underfrequency.
As modern protective relays become increasingly more powerful and complex. The tests themselves will reveal catastrophic failures which would have prevented the relay from performing when called upon to operate, while properly maintained records will reveal. Protective relay a relay whose function is to detect defective lines or apparatus or other power system conditions of an abnormal or dangerous nature and to initiate appropriate control circuit action. The relay is a well known and widely used component.
Inspection, testing and commissioning of electrical. Information to test any protective relay, create your own test plans, and perform tests in the field, regardless of manufacturer. Virtually every testing job will, in some way, ask you to do something you have no idea how to do. They require testing during different stages of relay development, commissioning, maintenance, configuration and troubleshooting. Use relay output control functions to verify output contacts, iffaults are infrequent. Optional accessories include external amplifier,gps,circuit breaker simulator,current booster,etc. Commissioning tools compliant for iec 61850 environments, high burden electromechanical relays, gps and irigb can be completed by allinone test sets. Three distance relays are tested using the proposed methodology. It is recommended that protective and auxiliary relays be given a complete calibration test and inspection at least once a year. Field test procedure for protective relays, november 1991. Page 3 of 15 standard work practice sp0518 ver 2 ergon energy corporation limited abn 50 087 646 062 ergon energy queensland pty ltd abn 11 121 177 802 return the relay scheme to service in an acceptable standard. This volume does not cover verifying circuits or testing devices involved with. Examples of testing of line protection and transformer protection are described.
The protective relay maintenance distribution course is an intensive, handson, lab oriented presentation. Protection systems play a key role for the safe and reliable operation of todays electricity power systems. Endtoend testing is considered to be the ultimate test for protective relay. Commission testing methods for protection systems mipsycon. The relay testing handbook 8d download ebook pdf, epub. The purpose of this standard work practice swp is to standardise and prescribe the method for testing of protection relays for. Protective relays are important parts of power transmission network. Development and production environments pose special challenges for a test system. Protection relay guides electrical engineering portal. Protective relay testing may be divided into three categories. A careers worth of relay testing experience you can carry with you on the job. This book was written for relay testers, rather than design engineers, so you no longer have to decipher engineering textbooks when performing relay tests.
The digital simulator based protective relay test setup used for the application of physical relay testing is described. Faults instrument transformers correlation to drawings. Communication systems required for protection system operation. Protective relay system the entire protective system, including the relays themselves, all associated wiring and terminals, all relay inputs and their current and voltage sources, control relays, and associated sensors and transducers. Introduction a power system simulator for relay testing should be. The reason for the discrepancy will not be a change in the relay characteristic but a change in the test conditions, for example, the relays proximity to a steel cabinet. Grounding protective relay for trans former protection, 263 ground preference, 91, 108 ground resistance, 303 groundingtranaformer protection, 268 hsrmoniccurrent restraint, for distance relays, 357 for transformer differential relays, 257 holding coil, 18 impedance diagram, see rx diagram impedance relay, characteristic on rx. Assessing the effectiveness of selftests and other. Iaictliac 60 field relay power system device function. Assuming the relay which is responsible is known further information is needed to be evaluated 1.
These contacts in turns close and complete the circuit breaker trip coil circuit hence make the circuit breaker tripped for disconnecting the faulty portion of the electrical circuit from rest of the healthy circuit. Protection relay testing for commissioning swp check this is the latest process zone version before use. Fuse an overcurrent protective device with a circuitopening fusible part that. Protective relays respond to measurements of current andor voltage of the power system, and have settings or adjustments. If relay settings are used as inputs into the test setup, you are only testing that the relay behaves according to how you have programmed it. Periodic relay testing is, first and foremost, preventive maintenance. This isnt much different than an ad converter test during a preventative maintenance test.
This online protective relay testing seminar follows chris werstiuk author of the relay testing handbook as he shows you the basic skills you need to test any digital relay with any modern testset. Acceptance testing, commissioning, and startup will include control power tests, current transformer and potential transformer tests, and any other device testing associated with the protective relay. The participant will learn the basics of distribution protection combined with handson, realistic training on actual relays. Protective relay testing verification and documentation. These tests are done to show that protection relays are free from defects during manufacturing process. With our cmc test sets we approach these challenges by providing you with stateoftheart technology that is renowned for its reliability, precision, and versatility. This includes all relay outputs and all devices in breaker trip circuits such as lockout relays, limit. For these tests, the relay outputs are normally disconnected from the remainder of the protection scheme, as it is a test carried out to prove correct relay, rather than scheme, operation. To ensure all transmission and generation protection systems affecting the reliability of the bulk electric system bes are maintained and tested. The relay will now use 30% of this itotto derive its actual restraint current, i. A monitoring relay whose function is to limit the operation of associated protective relays to specific field protective relay a relay that functions to prevent overheating of the field excitation winding by reducing or interrupting the excitation of the shunt field.
Watch this series of videos on any device with speakers or headphones, and a highspeed internet connection. A comprehensive testing program should simulate fault and normal operating conditions of the relay. Digital simulator applications in protective relay testing. Click download or read online button to get the relay testing handbook 8d book now. Due to the various types of protective relays, it is important to be able to distinguish what type you have and then run protective relay testing accordingly. The goal of protective relay testing is to maximize the availability of protection and minimize risk of relay misoperation. Sp0518 protection relay testing for commissioning swp pdf file. Must also perform energizing procedures and in service load checks. Auxiliary relays respond to control system currents or voltages. Prc005 is not specific on where the boundaries of the protection systems lie.
Protective relay and protection circuit design considerations document developed by the electric systems group, 8668440, at 3034452850. Protective relay test sets switchgear, or relay testers, are ideal for testing single, 3, 4 and 6 phase protection relay systems. Automated testing programs are not suited for commission function testing inject current and voltage based on relay s settings not be able to detect setting errors typos bad system data do not test programmed logic or specific io functions. The relay testing handbook is an indispensable resource that every relay tester should keep at their fingertips. Testing will be done at several stages during manufacture. Protective relay testing can find flaws in your protective relay that may prevent it from detecting the small changes in the power system. Abstractperforming tests on individual relays is a common practice for relay engineers and technicians.
Protective relays relay acceptance testing owner preferences verify 100% of all included analog and digital io even if not all the io are used load relay settings digital relays setting files loaded into relays vendor specific software tools verify by comparing relay to setting file should be no differences. Pdf remote protective relay testing mustarum musaruddin. End testing is not a substitute for relay calibration note that many relay calibration routines will not address functionally testing or calibrating communications. Pw460 pw460 615a, 4300v is the 3 phase relay test equipment can test all types of protective relays. This report provides a survey of protective relaying technology and its associated communications technology used in todays power transmission systems. Periodic inservice load readings, relay io testing, em relay. Protection relay testing and commissioning cedengineering. Types of electrical protection relays or protective relays.
The paper proposes remote protective relay test system via application service. Thus, procedures and records should be designed with preventive maintenance as the guide. This guide focuses on the general approach and specific procedures for testing protective relaying systems that include multiple interacting relay components, auxiliary devices, and power apparatus. This relay test kit has inbuilt output monitoring and recording function and also supports testing kit iec 61850 ied. Which of the procedures described below are added to your test plan will depend on the specific project or industry specifications, to be determined by the equipment owner or system engineer. Properly working protection devices help to maintain the safety of the system and to safeguard assets from damage. When a modern numerical protection relay with many functions is assessed, each of which has to be typetested, the functional typetesting involved is significant issue. Protective relay testing using a modern digital real time. This revolutionary product, the most modern equipment of its class, fulfills the requirements of the. Thus, the true purpose of preventative maintenance may be lost. In order to ensure reliable operation, protective relays as well as recloser controls must be tested throughout their.
1402 284 629 974 1443 153 736 254 489 1010 601 411 113 1598 713 1387 604 1416 1008 1565 198 221 1586 1216 112 665 93 1418 319 20 1143 836 863 927 224 502 521 606 729 123 343 15 1211 160 1426 301