Description
A mechanical device for relieving excess pressure in large volumes of gas or liquid. The patented double seal system provides fast response times and automatic resealing after pressure release. Options are available with local trip indication, signal switches for warnings, and a protective housing to control the release of hot oil and gas.
Application area
Overpressure protection on transformers, on-load winding switches and other electrical equipment.
Qualitrol pressure relief devices are used in transformers for a variety of applications:
- Networks (up to 500 kVA and above)
- Large power distribution and small power systems (up to 2500 kVA)
- Medium power systems (2500 to 10,000 kVA)
- High power systems (10,000 kVA and above)
- Load winding switches
- Mobile systems
- Electric locomotives
Advantages:
- Confidence with international standard in pressure relief devices
- Rugged design and materials provide reliable protection
- and long service life
- Widest range of supply options to suit every need
- 100% inspected to ensure quality
- Visual and remote trip indication
| SPECIFICATIONS | ||
| Materials | Lid | Galvanized cold rolled steel, chromate or thermoset powder coated, or 300 series stainless steel (depending on model) |
| Flange | Die-cast aluminum; Polyester resin impregnation, chromate conversion coating and ASA 70 light gray thermoset powder coating | |
| Ring | Aluminum with chromate conversion coating | |
| Indicator pin | Brass | |
| Indicator pin coupling | UV resistant nylon and high temperature thermoplastic elastomer | |
| Sleeve | Stainless steel | |
| Spring | Galvanized Spring Wire ASTM A229 Oil Tempered Chromate Coated | |
| Spring seat | Aluminum | |
| Valve stems | Galvanized carbon steel with chromate coating | |
| External fastening | Stainless steel | |
| Valve | 304 stainless steel, seals lubricated with silicone grease | |
| Springs | ASTM A229 Oil Tempered Spring Wire | |
| Pins | 416 stainless steel or 300 series stainless steel (depending on model) | |
| Seals | Nitrile, Viton or Silicone (depending on model) | |
| Semaphore (optional) | Durable plastic with stainless steel hardware as standard | |
| External conditions | Working temperature | -40°C to +80°C (-40°F to +176°F) |
| Operating oil temperature | -20°C to +100°C (-4°F to +212°F) | |
| Salt fog | Salt spray test for 200 hours per ASTM B:117 with no visible signs of corrosion | |
| Salt spray test for 1000 hours without noticeable loss of strength | ||
| Electrical part | Electrical connector | Cable entry IP66, PG-13.5, max. 2.5mm 2-conductor cable (14 AWG) |
| Working temperature | -25°C to +85°C (-13°F to +185°F) | |
| Dielectric strength | 2500VAC, 50/60Hz for one minute | |
| Switch characteristics | ½ A at 125 VDC (non-inductive) | |
| ¼ A at 250 VDC (non-inductive) | ||
| Electrical connector | QUALITROL Round 3-Pin, ANSI Round 3-Pin, Military Spec Round 3-Pin MS3102E16-10P, Raw Ends or Terminal Box | |
