Transformers complete with switching device for isolation of circuit.

I spent several hours first looking for references for this rare term and then for suitable translations for it. Most of the references referred to feedthroughs (bushings), which do not apply here. Finally, I got some circumscriptions.

Coffret de distribution type passage en coupure en charge PCC
https://www.groupe-cahors.com/fr-coteivoire/coffret-de-distr...
(Note: Example for non-pertinent applications)

Norme Française NF C 17-200
24 septembre 2016
C 17-200
Installations électriques extérieures
:
Figure 54D Mise à la terre par passage en coupure et connexion dans le CANDELABRE
Dans tous les cas, il est recommandé que la partie du conducteur assurant la mise à la terre du CANDELABRE située en dehors du sol ait une longueur suffisante afin de ne pas risquer d'être rompu en cas de renversement accidentel du CANDELABRE
https://docplayer.fr/74882403-Nf-c-septembre-2016-c.html
Note: Fig. 54 D shows all protective conductor terminals connected in series, i.e. that all terminals are connected by handing over the continuous protective earth conductor or by tapping or connecting the conductor in line or series.
I understand: Figure 54D Earthing by connecting the LIGHT POLES in line or sequence

Le branchement HT comprend : -le départ et la ligne aérienne raccordée soit à une centrale ou à une sous- station où la tension HT est disponible, soit en passage en coupure sur la ligne la plus proche, devant être équipée impérativement de protections de la ligne compatibles avec celles déjà existantes sur l’ensemble du réseau.
http://www.ore.mg/TextesDoc/Arrete_no86-88 MIEM.pdf

My approach: The HV connection includes: -the feeder and the overhead line connected either to a power plant or a substation where HV voltage is available, or by looping through (connecting) to the nearest line, which must be equipped with line protection compatible with that already existing on the entire network

A line tap is any connection made to a transmission or distribution power line in parallel called a feeder. It will have some sort of fused or breakered disconnect. Here is a schematic of a substation. I have circled in blue all the line taps.
https://www.quora.com/What-is-a-line-tap-For-example-may-a-s...

In electrical and electronic engineering, a daisy chain is a wiring scheme in which multiple devices are wired together in sequence or in a ring,[1] similar to a garland of daisy flowers. Other than a full, single loop, systems which contain internal loops cannot be called daisy chains.[citation needed]
Daisy chains may be used for power, analog signals, digital data, or a combination thereof.
https://en.wikipedia.org/wiki/Daisy_chain_(electrical_engine...
(Note: 'Daisy chain' is used mostly in electronics, but I consider it being applicable in our power electricity context as well)

A daisy chain connection has little resemblance to a daisy flower, at least not visually. In electronics, a daisy chain connection involves connecting multiple devices sequentially in an uninterrupted cable connection. Depending on the requirements, the last device on the loop may or may not connect to the first.
https://resources.altium.com/p/keep-petals-optimizing-daisy-...

The range of voltages in a power system varies from 110 V up to 765 kV. Transformation may take place in several stages and at several substations in sequence, …
https://academickids.com/encyclopedia/index.php/Electrical_s...

54 postes MT/BT tous équipés de transformateurs de 630 KVA dont 13 en passage en coupure;
=>
54 MV/LV substations all equipped with 630 KVA transformers, 13 of which are connected in sequence or daisy-chain mode;

Note: 'Connecting in line or series or sequence' or 'by tapping' may also work, but I consider the daisy-chain method being more figuratively.