SELlib

Read and write the file formats an SEL protective relay project is made of — the ones AcSELerator QuickSet produces.

Nothing here talks to a relay, opens a socket, or knows what a web request is.

Renamed. This library was published as selfiles for 1.x. From 2.0.0 it is SELlib, and the import moved with it — import sellib, not import selfiles. Nothing else changed in 2.0.0; the major is the rename. The selfiles distribution has been removed from PyPI, so there is no version of it left to install: import selfiles does not resolve to anything, and a requirements file naming it will fail rather than quietly install something older.

import sellib
from sellib.rdb import process_upload
from sellib.dnp_map import parse, discover

sellib.configure(user_data_dir="~/.pacct/data", cache_dir="/var/cache/rdb")

info = process_upload(open("substation.rdb", "rb").read(), "substation.rdb")
for relay in info.relays:
    print(relay.name, relay.model, relay.ip)

module	what it reads
`sellib.rdb`, `.rdb_cache`	the RDB (an OLE compound database): relays, models, addresses, extracted into a content-addressed cache
`sellib.settings`	`SET_*.TXT` relay settings
`sellib.dnp_map`	`SET_D<n>.TXT`, the DNP3 point map
`sellib.gle`	QuickSet logic diagrams — parse, and render a page to SVG
`sellib.selogic`	SELOGIC equations: parse, compare by equivalence, normalise settings
`sellib.models`	per-model registries: block conventions, and valid Relay Word names
`sellib.scl`	what an SCL/SCD holds that is SEL's: the `sAddr` `db:` grammar, GOOSE health bits, the bit → MMS item tables. The standard half is `py61850`
`sellib.match`	cross-match an RDB's relays against an SCD's IEDs
`sellib.dnp_profile`	SEL DNP3 device profile bundles

The one contract to know about

sellib.dnp_map guarantees parse(b).serialize() == b, byte for byte, for every SET_D in the reference corpus. These bytes go back into a protection relay: a settings file that round-trips imperfectly is a relay that behaves in a way nobody asked for. The 0x1C field separator lives inside the line, before the CRLF, and is preserved literally, along with each model's own index padding (BI_1 on a 411L, BI_00 on a 751).

Writing a Compound File back out — needed whenever an edit grows a stream — is cfbwrite, a separate library.

What is not here

Reading an SCL file as an IEC 61850-6 object model — the document, the DataTypeTemplates pool, the Communication section, a per-IED tree of logical nodes, datasets, control blocks and ExtRefs — is py61850, which sellib depends on. None of that is SEL's, and a Siemens or GE file needs exactly the same reader.

What stayed here is what only SEL writes: the db: grammar inside the standard sAddr attribute, and the pubRxStatus health bit inside a <Private> block. Both are read off py61850 model nodes, so the two libraries never parse one file twice and cannot come to disagree about it.

Data

The per-model registries ship with the package. configure(user_data_dir=...) adds an overlay searched first, per model, so a host can add a relay model at runtime without shipping a new release and without repeating the rest.

Install

pip install sellib

Python 3.10+, and py61850 for the standard half of an SCL file. Extracted from PAC CT, where all of it is exercised against a real substation corpus.

Licence

AGPL-3.0-or-later — see LICENSE.

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