Drawout vs hard wired relays
Manufactures moved to hard wired relays when the transition from e/m to electronic occurred. This has been the source of great pain for users. A typical modern microprocessor relay will have to be
removed for update or repair several times during it's lifetime. The labor to remove and replace will far exceed the cost of the relay. In some cases important transmission lines may need to be
removed from service putting the system in jeopardy. Customers need to push manufactures to build a product that is serviceable in a modular fashion without removal of the relay case. In this age a
relay should be serviceable in minutes with a couple of man-hours labor rather than days and hundreds of man-hours.
#2
Jim(Tuesday, 12 February 2019 15:06)
Relay design: one processor vs multiple
Early relays had small relatively slow microprocessors that used thousands of lines of code. Most all those lines were dedicated to protection. Current designs use much faster and capable processors
that do many additional tasks over and beyond just protection elements and require hundreds of thousands of lines of code. The communications tasks alone far exceed the protection tasks in code lines
and processor burden. Good design practice demands that multiple dedicated processors be used so that the main critical function of the relay, protection, be straightforward and as simple as possible
to design and maintain. It is a travesty that a change in communications programming on a firmware upgrade could cause the whole relay to hang. Each section of the relay should be its own island
unaffected by trouble and bugs in the other sections. All code has bugs. It's just a matter of time before they manifest.
#3
Jim(Tuesday, 12 February 2019 16:25)
Opinion: Time domain transmission line relay
This relay attempts to measure the elapsed time on traveling voltage waves to achieve faster tripping times. I'm not sure there is enough real world experience with this method for my comfort.
Instrument voltage transformers were not designed with this relay in mind. There may be significant errors causing false tripping especially on medium length and short lines. I would take a wait and
see approach letting others bear initial development and revision pain. What is the price/risk of gaining a few milliseconds?
#4
Jessica(Thursday, 11 July 2024 10:22)
Dear Jimmackengineering,
I hope this email finds you well.
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market, having a professional and engaging website is essential for attracting and retaining customers. With a proven track record of implementing over 2,000 websites in the UK, our team of
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Could you please provide us with your phone number so we can schedule a convenient time for your free demo? Alternatively, you can reply to this email with your availability, and we will be happy to
accommodate.
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Jim (Tuesday, 12 February 2019 02:00)
Drawout vs hard wired relays
Manufactures moved to hard wired relays when the transition from e/m to electronic occurred. This has been the source of great pain for users. A typical modern microprocessor relay will have to be removed for update or repair several times during it's lifetime. The labor to remove and replace will far exceed the cost of the relay. In some cases important transmission lines may need to be removed from service putting the system in jeopardy. Customers need to push manufactures to build a product that is serviceable in a modular fashion without removal of the relay case. In this age a relay should be serviceable in minutes with a couple of man-hours labor rather than days and hundreds of man-hours.
Jim (Tuesday, 12 February 2019 15:06)
Relay design: one processor vs multiple
Early relays had small relatively slow microprocessors that used thousands of lines of code. Most all those lines were dedicated to protection. Current designs use much faster and capable processors that do many additional tasks over and beyond just protection elements and require hundreds of thousands of lines of code. The communications tasks alone far exceed the protection tasks in code lines and processor burden. Good design practice demands that multiple dedicated processors be used so that the main critical function of the relay, protection, be straightforward and as simple as possible to design and maintain. It is a travesty that a change in communications programming on a firmware upgrade could cause the whole relay to hang. Each section of the relay should be its own island unaffected by trouble and bugs in the other sections. All code has bugs. It's just a matter of time before they manifest.
Jim (Tuesday, 12 February 2019 16:25)
Opinion: Time domain transmission line relay
This relay attempts to measure the elapsed time on traveling voltage waves to achieve faster tripping times. I'm not sure there is enough real world experience with this method for my comfort. Instrument voltage transformers were not designed with this relay in mind. There may be significant errors causing false tripping especially on medium length and short lines. I would take a wait and see approach letting others bear initial development and revision pain. What is the price/risk of gaining a few milliseconds?
Jessica (Thursday, 11 July 2024 10:22)
Dear Jimmackengineering,
I hope this email finds you well.
We specialise in creating visually stunning and highly functional websites that help businesses like yours Jimmackengineering stand out in the digital landscape. In today's fast-paced and competitive market, having a professional and engaging website is essential for attracting and retaining customers. With a proven track record of implementing over 2,000 websites in the UK, our team of experienced designers and developers is dedicated to delivering customised web solutions tailored to meet your specific needs and goals.
Could you please provide us with your phone number so we can schedule a convenient time for your free demo? Alternatively, you can reply to this email with your availability, and we will be happy to accommodate.
We look forward to the possibility of working with you.