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IEEE C37.30 High-Voltage Testing of Air Switches Rated Above 1000 V

IEEE C37.30 determines loading, installation, and maintenance guidelines for outdoor air switches. As a certified environmental test lab, we realize the importance of high-voltage testing. Meeting the environmental IEEE C37.30 requirements can be difficult. We understand the challenges and guide companies through the process.

Keystone provides the peace of mind that all of your needs will be met. Our pricing is competitive and we offer volume discounts. We have a reputation for helping customers achieve their environmental product certifications. When products do not meet the requirements, we assist with finding solutions.

Request a quote to receive testing services tailored to your specific requirements. Have a question about IEEE C37.30 compliance testing? Contact us or call (724) 657-9940 and we will determine the best course of action.

Summary of IEEE Standard of AC High Voltage Air Switches

IEEE C37.30 covers preferred ratings; construction and testing, loading, and operation requirements. The IEEE standard test method is only for outdoor air switches rated over 1000 V. This includes switch types such as disconnect, horngap, fault-initiation, and ground for manual or power operation.

The following switch types are not covered in this IEEE test standard:

  • Interrupter switches
  • Distribution cutouts fitted with disconnecting blades
  • Switches used in metal-enclosed and pad-mounted switchgear

The IEEE C37.30 standard for high-voltage air switches also does not apply to load-break separable insulated connectors, circuit breakers, circuit switchers, or reclosers.

An outdoor switch is designed for operations outside of buildings and enclosures. The switches are capable of being exposed to natural elements. The switches have no restriction of heat transfer to the ambient atmosphere.

Scope of IEEE AC High Voltage Testing of Air Switches

The purpose of this IEEE standard is to provide basic information for air switches. An air switch can be defined as a switching device designed to close and open one or more electric circuits. This is by means of guided separable contacts that separate in the air. Additionally, the switching device can be equipped with arcing horns.

High-voltage switches conforming to IEEE are suitable for operation within specified limits. This includes ambient temperature within the range of -30 to +40 degree Celsius. The altitude must not exceed 1000 m while the wind velocity must not exceed 37 m/s. Lastly, air switches are designed for normal applications with this IEEE standard.

Unusual conditions may exist. Conditions include operating in high altitudes. Equipment that depends on air for its insulating and cooling medium will have a higher temperature shock strength. Abnormal vibration, shocks, earthquakes, or tilting are other operating conditions that are described as unusual. These conditions must always be brought to the attention of the testing facility and manufacturer. 

IEEE C37.30 High-Voltage Compliance Testing Procedures

The IEEE standard breaks down 8 procedures that establish physical and electrical conditions for the reproducibility of this test. The IEEE C37.30 tests are not intended to be used as a part of normal production. On the other hand, these tests evaluate design modifications and assure that performance has not been adversely affected.

Withstand Voltage Testing

Withstand voltage verifies the capability of a switch against voltages. More specifically, this test evaluates the ability of switches with specified magnitudes and wave shapes of test voltages applied under specific conditions.

Temperature Rise Testing

These tests are performed to demonstrate a switch’s ability to carry a current equal to its continuous current rating. The switch must not exceed observable temperature rise limits.

Short-time Withstand Current Testing

These tests are carried out to evaluate a switch’s ability to withstand the magnetic forces and thermal duty imposed by a short circuit.

Fault-making Current Testing

Fault-making current tests assess the ability of a switch to close and carry a short-time withstand current driven by a voltage up to its rated maximum voltage.

Ice-loading Testing

This portion of the IEEE test demonstrates the rated ice-breaking ability of outdoor switching equipment. The test also shows if equipment will operate successfully under iced conditions.

Mechanical Operations Testing

The purpose of mechanical operations testing evaluates if a switch can properly operate during its mechanical life expectancy.

Corona Testing

Corona tests consist of voltage followed by the detection of visible corona plumes and spikes. These are produced at the external surface extremities of the device being tested.

Radio-Influence Testing

Radio-influence testing carries out the application of voltages and the measurement of the corresponding radio-influence units produced by the device being tested.

Expert IEEE High-Voltage Compliance Testing of Air Switches

Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. In addition to IEEE AC high-voltage testing, Keystone has a full scope of expertise including environmental and package testing such as accelerated aging, cold chain, and ingress protection.

Complete our request a quote form to get a jump start on the conversation. Have a question about air switches rated above 1000 V? Contact us or call (724) 657-9940 and we will determine the best course of action.