PARTNER TRAINING · DISTRIBUTORS AND CHANNEL

THE EARLY WARNING From fault to action A fault develops A developing fault inside the transformer begins to generate gas. Hydrogen appears Hydrogen generation is a leading indicator of an impending failure. The monitor alerts GRIDSCAN monitors continuously and alerts the owner when the asset enters an abnormal state. The team acts Maintenance steps in while the problem is still manageable, before a premature or catastrophic failure. 4<br>

WHAT SETS H2SCAN APART Set-and-forget monitoring 10 years Warranty on the hydrogen sensing element of the GRIDSCAN, with 3 years on the product < 2% Cross-sensitivity to other gases such as CO, CO₂ and hydrocarbons Zero Calibration gases, consumables or scheduled sensor maintenance, thanks to patented self-calibration Hours To install and start getting value, not weeks or months. Solid state, with no moving parts<br>

02 The portfolio Three sensors, a control hub and a packaged solution for underground network transformers. 6<br>

THE LINE-UP Portfolio at a glance 7 SENSOR GRIDSCAN 5000 Series Hydrogen in the oil or gas space. Built for fleet-wide monitoring.
The series includes: 5000, 5000-HP, 5010, & 5015. SENSOR GRIDSCAN 5015 High-range hydrogen in the gas space, from 250 to 50,000 ppm. SENSOR GRIDSCAN 6200 Hydrogen, moisture, temperature and pressure in oil, from one device. CONTROL HUB GRIDSCAN AO-2 Local display, alarm relays and analog I/O for GRIDSCAN sensors. SOLUTION HY-VAULT A GRIDSCAN 5000 Series sensor with the AVO-1, for underground network transformers.<br>

SENSOR · HYDROGEN IN THE OIL OR GAS SPACE GRIDSCAN 5000 Series Where it fits Real-time, fleet-wide hydrogen monitoring for transformer fleets of any size
Installs in the insulating liquid or the headspace of power transformers and ancillary equipment
Works in mineral oil, silicone, natural ester and synthetic ester
Runs standalone, or integrates into OEM transformer monitoring and multi-gas DGA systems
Two accuracy grades: the 5000 and the 5000-HP Key specifications 8<br>

SENSOR · HIGH-RANGE, GAS SPACE GRIDSCAN 5015 Where it fits Transformers with much higher hydrogen concentrations in the nitrogen blanket
Renewable energy sites where high harmonics drive heavier gassing
Underground vault transformers
Gas-phase measurement only: it does not install in the insulating liquid
The data sheet is marked "Coming soon", so confirm availability with H2scan before quoting Key specifications 9<br>

SENSOR · MULTI-SENSE TRANSFORMER HEALTH MONITOR GRIDSCAN 6200 Where it fits Customers who want more than hydrogen from one device: hydrogen, moisture, temperature and pressure
Continuous dissolved gas monitoring in the transformer oil space
Works in mineral oil, silicone, natural ester and synthetic ester
Integrates with SCADA, IoT platforms and OEM or multi-gas DGA systems, and aggregates data through H2cloud
No calibration gases, consumables or scheduled maintenance Key specifications 10<br>

CONTROL HUB AND DISPLAY UNIT GRIDSCAN AO-2 What it adds A local display of alarms, transformer measurements and hydrogen trends
Four relay contacts for local alarming
Inputs for external sensors such as load current and top oil temperature
Auto-detects GRIDSCAN 5000 or GRIDSCAN 6000 sensors, and configures without a computer
Magnet mount for fast installation, with no framing construction
Can connect up to two GRIDSCAN sensors per display Key specifications 11<br>

SOLUTION · UNDERGROUND NETWORK TRANSFORMERS HY-VAULT Why utilities want it Hydrogen generation is a leading indicator of an impending failure in network transformers
Improves personnel and public safety, and makes maintenance work safer
Minimizes unplanned outages that can affect large city blocks
Helps utilities direct people and OPEX to the units that need attention
Quick installation and commissioning: hours, not weeks
One sensor to monitor both the switching compartment and main tank What is in the package 12<br>

QUICK REFERENCE Sensors side by side 13 All four: IP68 and C5M marine equivalent, RS-485 with Modbus or DNP3, and no periodic calibration.<br>

03 Installation Where the sensor goes, how it should be oriented and which mounting accessories are available. 14<br>

THE BASICS Measuring in gas or oil 15 Two places to monitor In a sealed tank design, the sensor can sit in the gas space or in the oil space. One reporting scale Gas-space readings are reported as in-oil equivalent. The ratio between the two is roughly 20:1. Vacuum is not a concern The sensor is not affected by transformer vacuum levels.<br>

THE BASICS Locations and angles 16 Typical installation locations: in gas at the top, in oil on tank and radiator valves Recommended install angles MOUNTING RULE Do not install with the sensor pointing down. This avoids gas accumulation at the sensor.<br>

INSTALLATION HARDWARE GRIDSCAN 5000 accessories 17 What to know Ordered as an oil or gas install, with Modbus or DNP3
¾ in. NPT bushing adapters to 1, 1.5 or 2 in., for all installs
DN25 and DN50 flange adapters for DN valves
Oil installs: adapter with bleed screws, plus an optional air bleed valve
Gas installs: optional NPT street tee
Cables of 5, 10, 15 and 30 m, a grounding clip and a ½ in. conduit gland adapter<br>

INSTALLATION HARDWARE GRIDSCAN 6200 accessories 18 Installed view: sensor clamped to the adapter on the valve What to know Oil install, ordered with Modbus or DNP3
KF-40 quick clamp and seal ring are included
Optional KF-40 adapters to 1, 1.5 or 2 in.
Optional DN25 and DN50 to 1 in. NPT adapters
Optional bleed valve assembly kit
Cables of 5, 10, 20 and 30 m, available separately
Teflon tape is not included<br>

04 Field examples What customers have seen after installing GRIDSCAN monitors on their transformers. 19<br>

MEDIUM-VOLTAGE FEEDER EVENT Through-fault detection 20 A small rise, caught On March 5, 2024, hydrogen rose from 0 ppm at 04:50 to 2 ppm by 06:40, then returned to 0 ppm at 3:10 p.m. A real cause A review of the medium-voltage circuit found a broken conductor that had caused a ground fault on the feeder. No truck roll Hydrogen returned to normal, so no further action was required.<br>

RENEWABLES Solar farm transformers Solar farm 1: steady, high gassing Six inverter transformers. Three showed high gassing of 6,000 to 9,000 ppm. A GRIDSCAN 5000 was installed in the nitrogen blanket of a 1.4 MVA, 10-year-old unit.
Before: frequent DGA oil samples, and degassing whenever a unit reached 8,000 ppm.
Now: hydrogen is checked daily. Levels are steady, so no truck roll. Solar farm 2: after a fluid change Nineteen inverter transformers. Mineral oil was replaced with FR3 to reduce high gassing. A GRIDSCAN 5000 was installed in the FR3 liquid of a 4-year-old unit.
Result: hydrogen fell to about 50 ppm but was not eliminated, possibly because of harmonics.
Now: daily monitoring with periodic manual DGA sampling. Not at alarming levels, so no truck roll. 21<br>

24 MVA TRANSFORMER, 12 YEARS OLD Removed before failure 22 APRIL 19, 2024 Transformer energized after a gassing investigation found no issues. MAY 8, 02:21 Fault detected as hydrogen production rose rapidly, creating the need for a manual DGA. MAY 20 Lab sample measured 80 ppm hydrogen and 52 ppm acetylene. OUTCOME Acetylene indicated the transformer should be removed from service for internal inspection.<br>

UTILITY PROOF OF CONCEPT From pilot to fleet standard 9 Substations in the pilot, chosen as a representative sample of transformer ages and vendors 7–45 Years in service across the pilot units with known ages, rated from 9.375 to 30 MVA 10 yr Plan to retrofit every distribution transformer. GRIDSCAN 5000 is now required on all new units 23<br>

IN THE FIELD Installation examples In oil, on SCADA the same day A GRIDSCAN 5000 mounted on a tank valve and connected to SCADA on installation day. With the GSAO-2 control hub A GRIDSCAN 6000 in oil, paired with the hub for local display and alarms. In an underground vault An in-gas installation on a vault transformer. 24<br>

05 Positioning Matching the product to the customer, and answering the questions you will hear most often. 25<br>

SELECTION GUIDE Which product for which need 26<br>

OBJECTION HANDLING Common customer questions About the technology Does it need calibration?
No. Patented self-calibration removes drift and the need for periodic calibration, calibration gases or consumables.
Will other gases affect the reading?
Cross-sensitivity to gases such as CO, CO₂ and hydrocarbons is under 2%.
Which insulating liquids does it work in?
Mineral oil, silicone, natural ester and synthetic ester. The 5015 measures in the gas phase only. About deployment How long does installation take?
Hours, not weeks or months. There are no moving parts, and the AO-2 configures without a computer.
How does it connect to our systems?
RS-485 with Modbus or DNP3, into SCADA or IoT platforms. Analog outputs are also available.
What is the warranty?
Three years on the product. The GRIDSCAN 5000 Series and 5015 add 10 years on the hydrogen sensing element. 27<br>

KEY TAKEAWAYS Early warning, without the upkeep Three points to leave with your customers 28 01 Hydrogen is the early warning It is a leading indicator of an impending transformer failure. 02 H2scan monitors are set-and-forget Solid state and self-calibrating, with no consumables or scheduled sensor maintenance. 03 One portfolio covers the fleet GRIDSCAN 5000 Series, 5015 and 6200, the AO-2 hub, and HY-VAULT for underground networks.<br>

30 MINUTES Questions and discussion www.h2scan.com Traci Hopkins, SMIEEE, CRL
thopkins@h2scan.com
+1 330 573 0148 29<br>