Sample Guard Enclosure for Transformer Oil Sampling and Nitrogen Service
Power On. Cabinet Closed. Condition Known.
Sample Guard is an external access system for oil sampling and nitrogen service on pad-mounted and other compatible cabinet-style liquid-filled transformers.
It extends the transformer’s oil-sampling and nitrogen-service access points to an external enclosure. Once installed, both tasks can be completed while the transformer remains energized and the main cabinet stays closed.
Benefits of External Oil Sampling and Nitrogen Service Access
How the Sample Guard Enclosure Works
Standard Sample Guard units extend the transformer’s oil-sampling and nitrogen-service access points to an external enclosure.
- A technician accesses the required connection without opening the main transformer cabinet.
- Oil sampling or nitrogen service is completed while the transformer remains in service.
- Oil samples can then be sent for laboratory testing, historical trending and diagnostic interpretation.
Built for Field Installation
Sample Guard is designed for field installation on compatible transformers.
- NEMA 3R-rated enclosure
- Powder-coated finish
- Stainless-steel enclosure option
- Select color options
- Mounting and installation hardware included
Sample Guard Purchase and Installation Options
Supplied and installed by RESA Power
RESA Power can supply and install Sample Guard. This option includes a one-year parts and labor warranty.
Direct Purchase for Customer or Contractor Installation
Customers may also purchase Sample Guard directly for installation by qualified customer personnel or a qualified contractor. Direct-purchase units include a one-year parts warranty.
Lead Time and Availability
Typical lead time is approximately two weeks for standard configurations. Lead times may vary based on configuration, finish, quantity and current availability.
Transformer Oil Testing and Diagnostic Services
RESA Power can support the complete condition-monitoring workflow:
- Sample Guard supply and installation
- Oil sampling support and sampling kits
- Laboratory testing and analysis
- Historical trending and diagnostic interpretation
- Recurring sampling programs
Customers can purchase Sample Guard independently or pair it with RESA Power oil-testing and diagnostic services.
Frequently Asked Questions About Sample Guard
What types of transformers can use Sample Guard?
Sample Guard is designed for pad-mounted and other compatible cabinet-style liquid-filled transformers. Final fit and installation requirements depend on transformer design, existing connections and site conditions.
Can Sample Guard be added to an existing transformer?
Yes. Sample Guard can be retrofit onto compatible transformers already in service or installed before the transformer is placed into operation. Installation requirements depend on transformer design, existing connections and site conditions.
Can Sample Guard be installed before a transformer is placed into service?
Yes. Sample Guard can be installed at a transformer factory or during other planned work before the transformer is placed into operation.
Can transformer oil be sampled without taking the transformer out of service?
Yes. The external oil-sampling connection allows routine samples to be collected while the transformer remains in service, and the main cabinet remains closed.
Can nitrogen-service connections also be accessed through Sample Guard?
Yes. Standard Sample Guard units include access for both oil sampling and servicing the nitrogen blanket. Both can be completed while the transformer remains in service and the main energized cabinet remains closed.
Who can install a Sample Guard enclosure?
RESA Power can supply and install Sample Guard. Customers may also purchase it for installation by qualified customer personnel or a qualified contractor.
What warranty is included?
Systems supplied and installed by RESA Power include a one-year parts and labor warranty. Direct-purchase units installed by the customer or its contractor include a one-year parts warranty.
What is the typical Sample Guard lead time?
Typical lead time is approximately two weeks for standard configurations. Lead times may vary based on configuration, finish, quantity and current availability.
Can RESA Power collect and analyze the transformer oil samples?
Yes. RESA Power can provide sample collection, laboratory testing, historical trending and diagnostic interpretation. These services are available individually or as part of an ongoing program.
