Kaçak akım rölesi tek hat şemasında gösterildi.

Yes, kaçak can mean several things depending on context. In everyday Turkish, it can mean things like illegal, smuggled, escaped, or runaway.

But in technical and electrical contexts, kaçak often means leakage. So:

• kaçak akım = leakage current
• kaçak akım rölesi = leakage current relay / residual current device relay

So here, kaçak is not about something illegal; it is a technical term related to electricity.

This is because Turkish is using a noun compound.

In Turkish, when one noun modifies another noun, the second noun often takes a suffix. A very common pattern is:

• first noun: bare form
• second noun: takes the 3rd person possessive-looking suffix

So:

• akım rölesi = current relay
• kaçak akım rölesi = leakage current relay

Here, rölesi is built from:

• röle = relay
• -si = compound suffix on the second noun

This does not mean his/her relay here. It is just how Turkish commonly forms noun compounds.

You can think of kaçak akım rölesi as a technical compound meaning relay for leakage current.

It has smaller pieces inside it.

A helpful way to see it is:

• kaçak akım = leakage current
• rölesi = its relay / relay of it, in compound structure

So the whole thing is basically:

• [kaçak akım] + [rölesi]
• relay of leakage current
• more naturally: leakage current relay

Turkish often stacks nouns this way, especially in technical language.

So this sentence contains a fairly dense technical noun phrase, but it is built in a normal Turkish way.

Because the full phrase is tek hat şeması = single-line diagram.

This is another noun compound:

• tek hat = single line
• şeması = diagram of it / its diagram, as part of the compound

Then the locative ending -da / -de is added to the whole compound, giving:

• şema
• şeması
• şemasında

So tek hat şemasında means in the single-line diagram.

If you said only şemada, that would just mean in the diagram. It would lose the more specific technical phrase single-line diagram.

Yes:

• şema = diagram, schema
• -sı = compound/possessive suffix
• -nda = locative ending after that form

So:

• şeması = its diagram / diagram of it / diagram, as part of a compound
• şemasında = in its diagram / in the diagram

In this sentence, because the full expression is tek hat şeması, the form becomes tek hat şemasında.

The n in -nda is normal here. After the possessive-type ending, Turkish uses this linking consonant before case endings.

Gösterildi means was shown.

It can be broken down like this:

• göster- = show
• -il- = passive
• -di = past tense

So:

• göstermek = to show
• gösterilmek = to be shown
• gösterildi = was shown

This is a very common structure in Turkish.

For example:

• yazdı = wrote
• yazıldı = was written

So gösterildi is the passive past form of göstermek.

Because Turkish technical writing often prefers the passive, just like English technical writing does.

Compare:

• Mühendis kaçak akım rölesini tek hat şemasında gösterdi.
  = The engineer showed the leakage current relay in the single-line diagram.

• Kaçak akım rölesi tek hat şemasında gösterildi.
  = The leakage current relay was shown in the single-line diagram.

The passive version is common when the writer wants to focus on:

• the item shown
• the result
• the documentation itself

rather than on who did the showing.

This makes the sentence feel formal and technical.

Because Turkish does not use articles the way English does.

English needs:

• a
• the

Turkish usually does not.

So a bare noun like kaçak akım rölesi can mean:

• a leakage current relay
• the leakage current relay

depending on context.

In this sentence, the context makes it natural in English to translate it as the leakage current relay, because it sounds like a specific component in a diagram.

So the lack of the in Turkish is normal.

Yes, that alternative is also correct.

Turkish word order is flexible, although the verb usually comes at the end.

The original sentence:

• Kaçak akım rölesi tek hat şemasında gösterildi.

puts the focus first on kaçak akım rölesi.

A different order:

• Tek hat şemasında kaçak akım rölesi gösterildi.

puts the location first, so it feels more like:

• In the single-line diagram, the leakage current relay was shown.

Both are grammatical. The difference is mostly about emphasis and information flow.

Yes, very much so.

In engineering and electrical contexts, tek hat şeması is the standard Turkish term for a single-line diagram.

Word by word:

• tek = single
• hat = line
• şema = diagram

But as a whole, it is best learned as one technical term.

So even though you can understand the parts separately, it is useful to memorize tek hat şeması as a set phrase.

A simple way to see it is:

• Kaçak akım rölesi = the leakage current relay
• tek hat şemasında = in the single-line diagram
• gösterildi = was shown

So the structure is:

• thing being discussed
  • location
    • verb

More abstractly:

• noun phrase
  • locative phrase
    • passive past verb

That is a very common Turkish sentence pattern, especially in formal and technical language.