Recovers, purifies, stores and refills SF6 from a single compact cart
For circuit breakers up to 132 kV
AGRU-7
SF6 gas recovery unit
| C/ María Barbeito, 14 | Contact Contact T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | T [+34] 982 20 99 20 info@amperis.com | www.amperis.com |
More capacity without the bulk of a trailer
The AGRU-7 was developed for users who need more storage and recovery capacity than small handcart units offer, but without the bulk and price of a skidor trailer-mounted unit. It recovers, temporarily stores, conditions and returns SF6 gas during field servicing of metal-clad switchgear, bus ducts and individual circuit breakers up to 132 kV.
A single valve to switch modes
Operation is very simple: a single valve selects the operating mode. The high-pressure, fully oil-less compressor allows SF6 to be stored in liquid form, and the gas is purified, dried and filtered to 0.1 µm during recovery and filling.
Applications
- Recover and purify SF6; recovered gas is purified twice during the normal operating cycle.
- SF6 purification: removal of particles, moisture and decomposition products.
- Evacuate air and moisture prior to filling.
- Consolidate partially used SF6 cylinders.
- Store SF6 in liquid state on board or in auxiliary cylinders.
- Regulated filling of SF6 equipment.
Functions and purification
Functions
- Recovery, purification and storage of SF6 from the circuit breaker to the storage cylinders.
- Evacuation of air and moisture from the circuit breaker, the hoses and the cart itself with the vacuum pump (< 1 mbar).
- Purification of SF6 by recirculating it through the filter system.
- Pressure-regulated recharging of the circuit breaker from the cylinders.
- Transfer of SF6 from the cart to an external tank for maintenance purposes.
Filtration and moisture control
The circuit includes a D-1 dryer filter, with activated alumina, that helps dry and purify the SF6; a purifier cartridge, with molecular sieve, that removes arcing by-products; and an F-1 particulate filter that retains particles down to 0.1 µm. Filters are changed without disconnecting any tubing or using special tools, and a colour-change moisture indicator shows the condition of the gas.
Construction
Stainless steel tubing and fittings instead of copper or brass, for better corrosion resistance and durability. The cart moves on four swivel casters and includes a 3 m power cord.
Compressor, vacuum and storage
High-pressure oil-less compressor
Direct-drive, fully oil-less SF6 compressor rated at 2 m³/h and capable of 34 bar (500 psi), which liquefies the SF6 and stores it in the on-board cylinders. An air-cooled condenser helps liquefy the gas at high ambient temperatures, and a discharge pressure switch shuts the unit down when the maximum allowable pressure is reached.
Recovery down to 100 mbar or below 1 mbar
In its standard version, the AGRU-7 recovers SF6 down to 100 mbar, which means recovering 99.6% of the gas. The XDS version adds a 6 m³/h vacuum compressor that brings the residual SF6 pressure below 1 mbar, for 99.9% recovery, and includes a digital vacuum gauge.
Vacuum pump
17 m³/h (10 CFM) vacuum pump that takes the equipment below 1 mbar to evacuate air and moisture before filling. It includes an anti-suckback valve, isolation valve, gas ballast and automatic oil return.
On-board, expandable storage
The cart carries two 52 kg storage cylinders, for an on-board capacity of 104 kg of SF6 in liquid form, which keeps indefinitely at ambient temperatures below 45.5 °C without refrigeration. The auxiliary connection allows storage to be expanded without limit using external cylinders or tanks (rated at 40 bar minimum).
AGRU-7 — SPECIFICATIONS BY VERSION
| Parameter | AGRU-7 | AGRU-7 XDS |
|---|---|---|
| Type | Portable SF6 gas recovery unit | |
| Application | Circuit breakers up to 132 kV, metal-clad switchgear and bus ducts | |
| Power supply | 220 V, single-phase, 50/60 Hz (other voltages on request) | |
| SF6 compressor | High pressure, direct drive, oil-less; 2 m³/h; up to 34 bar (500 psi) | |
| Vacuum compressor | — | 6 m³/h |
| SF6 recovery | Down to 100 mbar (99.6%) | Down to < 1 mbar residual pressure (99.9%) |
| Vacuum gauge | 0 - 50 mbar | Digital |
| Vacuum pump (air and moisture evacuation) | 17 m³/h (10 CFM); < 1 mbar | |
| Filtration | D-1 dryer filter, purifier cartridge and F-1 particulate filter (0.1 µm) | |
| Moisture indicator | Colour change | |
| On-board storage | 2 × 52 kg cylinders: 104 kg of liquid SF6; expandable with external tanks | |
| Tubing and fittings | Stainless steel | |
| Mobility | 4 swivel casters | |
| Power cord | 3 m | |
| Hoses | Not included: ordered separately (see accessories) | |
| Dimensions (height × width × depth) | 1727 × 851 × 1003 mm (68 × 33.5 × 39.5″) | |
| Weight | 324 kg (714 lb), with two cylinders |
Data subject to change without notice.
| AGRU-7 — COMPONENTS | |
|---|---|
| Suction pressure regulator | 0 - 2 bar, spring-loaded |
| Equalization circuit | Allows the compressor to restart at high pressure |
| Check valves | Prevent high pressure from returning to the compressor during low-pressure equalization |
| Condenser | High-efficiency, four-pass, air-cooled; helps liquefy SF6 at high ambient temperatures |
| Discharge pressure switch | Automatically shuts the unit down when the maximum allowable pressure is reached |
| Vacuum pump | 0.37 kW TEFC motor; blank-off pressure 0.03 mbar (20 microns); anti-suckback valve, isolation valve, gas ballast and automatic oil return |
| Valves | Quarter-turn, with PTFE seats and seals, rated for system pressure, temperature and flow |
| Pressure gauges | Two 4″ stainless steel gauges: equipment pressure (compound) and discharge pressure |
| Filling pressure regulator | 0 - 7 bar, spring-loaded, for safe regulated filling |
| Storage | Liquid SF6 kept indefinitely at ambient temperatures below 45.5 °C without refrigeration; connection for external tanks rated at 40 bar minimum |
Storage cylinders and tanks include a relief valve and inlet and outlet valves.
AGRU-7 — SCOPE OF SUPPLY, OPTIONS, ACCESSORIES AND CONSUMABLES
| Standard supply | AGRU-7 unit, 220 V, 1 phase, 50/60 Hz, with 2 m³/h SF6 compressor, 17 m³/h vacuum pump, stainless steel tubing, D-1 dryer filter, F-1 particulate filter, purifier cartridge, 3 m power cord, four swivel casters and shipping crate |
|---|---|
| XDS version | 6 m³/h vacuum compressor to recover SF6 down to < 1 mbar residual pressure (99.9%), with digital vacuum gauge |
| Option | Digital platform scale for SF6 cylinders, to monitor filling |
| Storage cylinder | 52 kg (115 lb) SF6 cylinder with CGA-590 valve, dry |
| Hoses | Set of two 3 m or 6 m hoses, with DN20 female connection at both ends |
| Adapters | DN8 male × DN20 female; DN20 male × DN20 male; DN20 × CGA-590 with valve, for North American cylinders; DN20 × DIN 477 with valve, for European cylinders |
| SF6 fittings kit | With carry case and foam with labelled cut-outs |
| Filter kit | D-1 dryer filter, F-1 particulate filter and purifier cartridge; replacement recommended every 50 hours of compressor operation |
| Vacuum pump oil | 946 ml bottle; check the level every time the pump is started |
Data subject to change without notice.