What is HIGHSET differential protection?

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Discussion Overview

The discussion revolves around the concept of "highset differential protection," particularly in relation to differential relays used in electrical systems. Participants explore the definitions, applications, and potential confusion surrounding highset features in relays, especially in the context of transformer protection.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant expresses familiarity with biased differential protection but seeks clarification on "differential instantaneous highset overcurrent protection."
  • Another participant provides a link to a resource that discusses high-set relays, implying that they are relevant to the topic.
  • A participant notes that high-set relays are typically used for radial feeder protection and questions their relevance to transformer differential protection.
  • Another participant suggests that terminology may be misleading, indicating that names may be used for marketing rather than technical accuracy.
  • One participant argues that high-set is a method of setting relays rather than a feature, expressing confusion about how relays can claim to have high-set protection.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the relevance and definition of highset differential protection, with multiple competing views and ongoing confusion about its application.

Contextual Notes

There are unresolved questions regarding the definitions and applications of highset protection, as well as the relationship between high-set relays and differential protection systems.

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I know biased differential protection system. But one differential relay I have at work here has a feature called "Differential instantaneous highset overcurrent protection". Does anyone knows anything about it?
 
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Thanks Simon.
it appears high-set relays are used for radial feeder protection. I don't see what it has got to do with differential protection of transformer.
 
Neither do I - but people will call things by whatever name they think will sell.
You should have a good idea what high-set" means now though.
 
High set just isn't a feature provided by a relay, it is just a method of setting relays. (Relays at the near ends are progressively set at higher pickup current value)
So how can relays talk of having and not having high-set protection?
I don't think I fully understand high-set yet.
 

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