- Before
- Four jobs a day across 11 kV substations, opening cable boxes and switchgear with the open work order and little else. “Tell me what's been done to this one before I open it.”
- Now
- Scans the tag and gets the asset's life story: the repeat, the crew note that named the fix, the parts and the hazards, every line with its record. Speaks the closeout and signs it.
One repeat fault, from the tag to a fix that holds
Lumina Utilities runs electricity and water networks. RMU-4471, an Arcton SR-3 11 kV ring main unit at Calder Road secondary substation, has tripped on earth fault on Way 2 three summers running, each time taking off the 312 customers on the Harbour Lane ring. On Tuesday 13 October 2026, Tomás Reyes is sent to investigate. Here is his day, screen by screen, in the working solution.
- 0106:00
Four jobs, every history read before the van leaves
Priya Nair · Dispatcher, Calder depotPriya builds Tomás's route for van V-217: RMU-4471 at 08:30, TX-2290 at 13:45, LVP-0815 at 15:00 and RMU-3318 at 16:15. Each job's history is read by 06:00 and cached on the tablet. The van list is built from the parts each past job used or named: the termination kit is loaded; the 63 mm gland, breather and heater for RMU-4471, a gasket kit for TX-2290 and anti-tamper bolts for LVP-0815 are at Calder depot.
“Bushing gasket kit, 200 kVA GK-200 · TX-2290 · named 2023, never ordered”
- 0208:30
He scans the tag on the switchgear
Tomás Reyes · HV field technician, North networkAt Calder Road secondary substation, CRD-S12, Tomás points the tablet at the tag. It reads RMU-4471 and matches it to one asset in the register, including the ID it carried before the 2014 system change, CR-S12/RMU1. Today's job is WO-2026-088391, raised by Helen Marsh: “Investigate repeat earth fault, Way 2 cable box”, with a planned outage from 09:00 to 13:00.
Tag and asset resolver: never guesses between two assets — if two could match, it asks.
- 037.0 seconds later
Seventeen years on one timeline
History reader · Pattern finderThe life story comes back: 19 events from 14 records and 23 photos, 2009 to 2026, in five lanes — installs and jobs, faults, repairs, tests and inspections, parts. Commissioned 14 Mar 2009. A 2021 inspection found the ground round the plinth wet. A June 2023 partial-discharge survey heard 14 dB ultrasonic at the Way 2 cable box: “Monitor, resurvey in 12 months.” It was never resurveyed. The pattern finder joins the three faults with a red band.
“Repeat found: 3 earth-fault trips · every one between June and August · all on the Way 2 cable box” — 383 and 343 days apart, 148,200 customer minutes lost.
- 04One switch
Fold by season, and the summers line up
Pattern finderFold by season redraws the timeline as years stacked over a single January-to-December line. The trips of 22 Jul 2024, 9 Aug 2025 and 18 Jul 2026 fall in the same summer column. A work-order list never shows it this way, and it is the view that turns three call-outs into one pattern.
“all 3 trips fall here”
- 0523 Jul 2024, as written
The crew that found the cause wrote it down
Daniel Mensah · crew lead, retired March 2026After the first trip, Daniel Mensah's crew re-terminated the Way 2 red phase and found the gland split. The record opens as it was written — crew, times, fault code EF-W2, the photos of the split gland and the tracking — with the quoted passage highlighted. The follow-up job, WO-2024-118377, was cancelled on 30 Sep 2024 as “merged with planned maintenance”. Since then, crews have dried the box and reset it.
“Gland on the Way 2 cable box is split and water is getting in round the cable. Box wet inside, tracking on the red phase. Replace the cable box gland and fit a new breather. No 63 mm gland on the van.”
- 06Ranked
The likely cause, and whether the fix held elsewhere
Cause and fix advisorWater through the split Way 2 gland ranks High, on 5 records. A dead anti-condensation heater, found in March 2025, ranks Medium. Termination workmanship ranks Low: Way 2 was re-terminated in 2024 and tripped again 383 days later. Tomás asks whether the gland and heater fix worked on other Arcton SR-3 units: nine had a wet cable box, all nine had gland CG-63-BR and heater ACH-50W fitted between 2022 and 2024, and none has tripped since, over at least 24 months each.
“RMU-4471 is the tenth with the same story, and the only one where the gland job was cancelled.”
- 07Before the box is opened
What past crews found inside, each with its record
Cause and fix advisorFour hazards from past visits: the Way 2 cable box found wet with tracking on the red phase in July 2026; discharge heard at this box in 2023; SF6 last read 1.29 bar on 18 Nov 2025, so check the gauge before operating; standing water at the plinth after rain. Beside them, the past fixes and how long each held — 383 days, 343 days, 87 days so far — and the two that were never done.
“Prove dead and earth Way 2 to approved procedure ODP-11-07 before opening, under switching schedule SS-26-4471. Switching is by control.”
- 0808:41
The parts from the 2024 note, reserved for approval
Parts checker · Aisha Karim, crew leadThe gland CG-63-BR, breather SGB-40 and heater ACH-50W are not on van V-217; Calder depot has 4, 6 and 2. Tomás reserves the three for job WO-2026-088391, to collect before 09:00. Aisha Karim approves at 08:43, and they are ready at the depot trade counter.
“The agent reserves; it never orders. Nothing leaves the store until the crew lead approves.”
- 0912:41
A spoken closeout becomes the record
Closeout writerTomás speaks his closeout at the substation, 2 min 14 s: the gland was split, “like Daniel said”; he fitted a new 63 mm brass gland and breather; the heater had no supply because the auxiliary fuse had gone, so he replaced both; the termination is sound. The closeout writer drafts cause, work done, parts fitted and readings after — IR 12 GΩ at 5 kV, PD ultrasonic 0 dB, TEV 7 dB, SF6 1.30 bar — and asks for the one reading that was missing.
Asked for: “Heater current after the fix?” — Tomás: “Heater drawing 0.22 amps.”
- 1012:52 · Signed
The fix joins the asset's story, so the next crew knows first
Tomás Reyes · HV field technicianTomás signs WO-2026-088391 as the technician who did the work. The life story gains a new event — 13 Oct 2026, gland, breather and heater replaced — and the 2024 recommendation and the cancelled job WO-2024-118377 are closed. The repeat is marked “fix fitted today, watch next summer”; the pattern finder checks it again after 31 Aug 2027.
Only the technician who did the work signs the closeout.