Description     Protective relays and monitoring relays detect or monitor for abnormal power system conditions. Protective relays detect defective lines, defective apparatuses, or other power system conditions of an abnormal or dangerous nature. The relay then initiates the appropriate control circuit actions. Monitoring relays are used to verify conditions in the power system or in the protective system. Monitoring relay functions include fault detection, voltage...
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Q & A on Protective Relays and Monitoring Relays

We asked our users for their input on Protective Relays and Monitoring Relays. Here are the results of 109 users familiar with Protective Relays and Monitoring Relays.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing protective relay and monitoring relay design?
18 answers
Answers:
Numerical, Automation features CMADA communication as well as Electromechnical Relays
~Gouse Sahib, Engineer, Al Jubail, Saudi Arabia
The digital protective relay, it monitors the matter instantly
~Architect/Builder/Contractor, DAKAR, Senegal
The use of fiber optic at the protection against electric arc.
~Angel C, Engineer, Zacatecas, Mexico
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Q:
From your perspective, which companies are creating the most innovative protective relays and monitoring relays?
19 answers
Answers:
ABB is No.1 in protection relays except some problems reporting. Siemens, Areva and GE also took most of the industry business.
~Engineer, Dammam, Saudi Arabia
There are quite a host of them, particularly in Europe; such as SIEMENS, ABB, AREVA, SCHNEIDER etc.
~Paul A., Engineering Consultant, Kaduna, Nigeria
Siemens, Telemecanique, Moeller, etc
~moody g, technologist/technician, ilorin kwara st, nigeria
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Applications and UseTop

Q:
What are some of the applications you have used protective relays and monitoring relays for?
25 answers
Answers:
I have used protective relays on various sizes of electric motors for various applications and for household equipments. We are electrical control panel builders and we use protective relay on our designs and constructions.
~moody g, technologist/technician, ilorin kwara st, nigeria
1. Electric Motor Protection and Control 2. Distribution System Protection & Control 3. Substation Protection & Control 4. Transmission System Protection & Control
~Paul A., Engineering Consultant, Kaduna, Nigeria
Motor protection relays like Multilin 469, Fuji 50/51, 87,50N Feeder Protection Multilin 745, Transformer Protection Multilin 750
~Gouse Sahib, Engineer, Al Jubail, Saudi Arabia
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Q:
Please share with us any “non-standard” applications that protective relays and monitoring relays have been used for.
8 answers
Answers:
I have not had cause to encounter any significant "non-standard" application in my field of operation.
~Paul A., Engineering Consultant, Kaduna, Nigeria
Fake overload relay common in our locality and so our design applications are never much standard.
~moody g, technologist/technician, ilorin kwara st, nigeria
Ground fault detection in 700 Vdc systems; detection 1-2 A differential
~Jim Gregory, Engineering Consultant, Westminster, MD
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of protective relays and monitoring relays?
8 answers
Answers:
1. Incorrect application of Residual Earth-fault Protection alone to Power transformers have resulted to serious damages due to improper monitoring of Neutral Current flow which is Disastrous to transformers in active service. 2. Residual Earth-fault Protection presently applied to Distribution Feeders has proved disastrous on High-impedance earth-faults, resulting to loss of lives and damage to valuable equipment for persistent uncleared faults.
~Paul A., Engineering Consultant, Kaduna, Nigeria
Electric motors got burnt as a result of low standard of overload relay used and incorrect setting as a result of lack of or little knowledge of the relays.
~moody g, technologist/technician, ilorin kwara st, nigeria
Malfunctioning during removal of current test block, without shorting current transformers
~Gouse Sahib, Engineer, Al Jubail, Saudi Arabia
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
12 answers
Answers:
Single relay with all protection elements for all kinds faults/situations providing protection to all equipments of plant as well as substation along with remote communication.
~Gouse Sahib, Engineer, Al Jubail, Saudi Arabia
Universal voltage and current measurement with downloadable software to create customized protections.
~Artur Pereira, Project Manager, Porto, Portugal
A. Wide coverage. b. Flexibility. c. Easy for operating. d. Competitive price
~Een Karyono, Engineering Consultant, Singapore, Singapore
Protective relays are becoming too complex for the average maintenance man.
~Ed M, Engineering Consultant, Trussville, AL
Intelligent State-of-the-art System Monitoring, Instrumentation & Control.
~Paul A., Engineering Consultant, Kaduna, Nigeria
Faster More user friendly Easier for coordination with other products
~Abdullah A, Engineer, Bandung, Indonesia
Sensing should be accurate in over voltage and under voltage protection.
~Engineer, Dammam, Saudi Arabia
Increase in sensitivity, ruggedness, robust, availability and cheap
~moody g, technologist/technician, ilorin kwara st, nigeria
All aspects of protections built in One relay with selectivity.
~Kariyalil Radhakrishnan, Engineering Consultant, Conakry, Guinee
Sepam (Schneider) Multilin (General Electric) Micon (Areva.)
~Angel C, Engineer, Zacatecas, Mexico
Write up of application details
~ROLAND S, Engineering Consultant, St Petersburg, FL
Reliability
~RAJU U, Engineer, Goa, India

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using protective relays and monitoring relays?
10 answers
Answers:
My advice is that they should pay particular attention to Basic Protective Relay Characteristics like; Reliability, Speed, Selectivity, Maintainability, Available System Functionality (for Modern Microprocessor Relays), Availability and Cost.
~Paul A., Engineering Consultant, Kaduna, Nigeria
Yes we should liase with standard and superior manufacturer and marketers for original products.
~moody g, technologist/technician, ilorin kwara st, nigeria
They should check the after sales services for relays including proper training for their usage.
~Engineer, Dammam, Saudi Arabia
Buy numerical relays or any latest technique based multi function relays
~Gouse Sahib, Engineer, Al Jubail, Saudi Arabia
Amount of use in the utility industries and technical support.
~ROLAND S, Engineering Consultant, St Petersburg, FL
A. Reliable. b. Flexible. c. Simple. d. Competitive Price
~Een Karyono, Engineering Consultant, Singapore, Singapore
Do not overkill, use just the right amount of protection
~Artur Pereira, Project Manager, Porto, Portugal
Go through a P.E. Protective Relays are too complex.
~Pieter J, Design Engineer, Seymour, CT
Choose them carefully for their own application.
~Angel C, Engineer, Zacatecas, Mexico
Select proper range and applicated relays
~RAJU U, Engineer, Goa, India

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of protective relays and monitoring relays?
9 answers
Answers:
When selecting Relays for particular application, we must study the nature of equipment and fault characteristics to help us select from an array of relays the ones that best suit our purpose before we make a commitment. For instance, you cannot select any ordinary overload relay for application on power transformers and Heavy-duty Electric motors which requires you tracing the temperature image of the equipment. You will have to weigh the cost implication of losing such an equipment vis-a-vis acquiring cheap relays in the immediate.
~Paul A., Engineering Consultant, Kaduna, Nigeria
Select the relay according to suit the requirement. Don't be so sophisticated which may not be suited to the requirement.
~Een Karyono, Engineering Consultant, Singapore, Singapore
Read the information, especially the application guide, to make sure which kind of relay is needed.
~Abdullah A, Engineer, Bandung, Indonesia
People should consult qualified personnel for their design and installations.
~moody g, technologist/technician, ilorin kwara st, nigeria
Choosing the brand and not by the application in your plant.
~Angel C, Engineer, Zacatecas, Mexico
Protective relay with data record is very important to use.
~Syed Moheed Ali A, Electrical system and power D/b, Jubail, KSA
Use the same equipment just because it worked in the past.
~Artur Pereira, Project Manager, Porto, Portugal
Not go with unproven equipment
~ROLAND S, Engineering Consultant, St Petersburg, FL
Electro mechanical relay
~Gouse Sahib, Engineer, Al Jubail, Saudi Arabia

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