News

Testing Electromechanical Relays

Testing Electromechanical RelaysTesting electromechanical relays involves the following steps:
• An inspection of the relay for loose screws, friction in moving parts, iron filings between induction discs and permanent magnets, and any evidence of damage to the relay.
• Correct settings should be applied or verified.
• Pickup Test: measures the point where contacts just close for a particular parameter
• Timing Test: measures the time to close contacts at a particular multiple of pickup applied to the relay.
• Instantaneous Test: if used, measures the point where instantaneous contacts close with no time delay
• Test of target and seal-in unit: if used, target indicates the relay has operated and seal in contact holds contacts closed until breaker trips.
• Test of Tripping Circuit.

Protective relays should be acceptance tested prior to being placed in service. Thereafter, they should be tested periodically to ensure reliable performance.  In normal industrial applications, relays should be tested at least every 2 years. In critical systems, testing should be conducted at least annually.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

Technician Tips to Test Relays

Technician TipsTechnician Tips

In order to test relays, the technician should:
• Understand the construction, operation, and testing of the particular relay
• Have the manufacturer’s instruction manual available
• Be given the settings to be applied to the relay and test points
• Have a test instrument available that is suitable to conduct tests on a particular relay
• Be allowed to trip the associated circuit breaker to ensure the relay trip contacts will operate the breaker

Protective relays should be acceptance tested prior to being placed in service. Thereafter, they should be tested periodically to ensure reliable performance.  In normal industrial applications, relays should be tested at least every 2 years. In critical systems, testing should be conducted at least annually.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

Protective Relays Types

Protective Relays TypesThree Protective Relays Types are:
• Electromechanical
• Solid state
• Numerical

Protective relays should be acceptance tested prior to being placed in service. Thereafter, they should be tested periodically to ensure reliable performance.  In normal industrial applications, relays should be tested at least every 2 years. In critical systems, testing should be conducted at least annually.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

Electrical Systems Anomalies

Electrical SystemsProtective relays are designed to respond to electrical systems anomalies in:
• Current
• Voltage
• Frequency
• Phase angle
• Direction of current or power flow
• And other parameters

Protective relays should be acceptance tested prior to being placed in service. Thereafter, they should be tested periodically to ensure reliable performance.  In normal industrial applications, relays should be tested at least every 2 years. In critical systems, testing should be conducted at least annually.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

Medium-Voltage Circuit Breakers & Protective Relays

Most medium-voltage circuit breakers have a protective relay to monitor the electrical system. Protective relays are used in conjunction with medium voltage circuit breakers to:

  • Sense abnormalities
  • Isolate the problem with minimal disturbance to the system
  • Minimize the damage to the faulted equipment.

Protective relays should be acceptance tested prior to being placed in service. Thereafter, they should be tested periodically to ensure reliable performance.  In normal industrial applications, relays should be tested at least every 2 years. In critical systems, testing should be conducted at least annually.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

NFMT 2017

ReNFMT 2017uter Hanney is Exhibiting at NFMT 2017.

Building Operating Management’s NFMT 2017 is the largest free conference and product expo for facilities professionals.

Come see us at the Baltimore Convention Center on March 7-9, 2017 (Booth #2562). The Baltimore Convention Center is located at One West Pratt Street, Baltimore, MD 21201.

 

Preventative Testing Program: a Cost Effective Investment

Preventative Testing Program: a Cost Effective Investment

Preventative Testing Program includes Substation
Your vital electrical systems are under constant stress, subjected to the damaging effects of thermal cycling, switching, mechanical stresses, and environmental extremes. And because the various components of your power distribution system, from individual relays and switches, to circuit breakers and transformers, are interrelated, the failure of even one component can lead to catastrophic system failure. Power outages, damage to equipment and property, and even injury to employees can occur. An inefficient electrical system can create unnecessary hardship on any company.

That’s why a “Preventative Testing Program” by Reuter Hanney is the most cost-effective investment you can make.

We can tailor an electrical testing program to meet your specific needs and budget. We also know how important it is for you to avoid downtime, and our first priority is to prevent unexpected outages from occurring. But if they do occur, we’ll act to restore power as quickly as possible. Reuter Hanney’s emergency team is on call 24 hours a day, seven days a week.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

 

Why Perform Fault Gas Analysis?

Why Perform Fault Gas Analysis?transformer

  • Fault Gas Analysis determines the percentage of combustible gasses present in the nitrogen cap of sealed, pressurized oil-filled transformers. This can provide information as to the likelihood of incipient faults in the transformer.
  • Since transformers play an important role in the electrical power system it is imperative to conduct transformer testing on a regular basis. The goal of testing is to confirm the transformer’s ability to continue functioning properly and to reduce the chance of failure.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

 

When to Conduct Metals-in-Oil Analysis?

When should Metals-in-oil analysis be conducted?

Metals-in-oil analysis should be conducted in large power transformers to determine quantity and type of metals present in the oil. This test can indicate problems with pump bearing wear, improper mechanical component operation, welding and fabrication process, severe contact erosion in Load Tap Changers and Oil Circuit Breakers, and thermal overheating. 

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

 

Why is Dissolved Gas in Oil Analysis Important?

Why is Dissolved Gas in Oil Analysis Important?

Dissolved Gas in Oil Analysis is a refinement of the Fault Gas Analysis. Dissolved gasses are extracted from an oil sample and analyzed. Different types of faults have different patterns of gas generation. This allows the nature of problems to be diagnosed and corrected.  Click here to read an excellent article provided by Neta “Dissolved Gas Analysis
for Transformers”.

Contact Reuter Hanney, the electrical power specialists, today at bids@reuterhanney.com for a review of your company’s electrical equipment needs and to learn more about safety, and safety maintenance procedures.

 

Visit Us On FacebookVisit Us On TwitterVisit Us On Google Plus