IEEE C37.083-1999

New IEEE Standard - Inactive-Reserved.

As an aid in testing circuit breakers under conditions of switching capacitive currents, synthetic test circuits may be used. The design of the circuit should simulate the stress of actual service conditions as closely as possible.

A number of circuits are given as examples. The limitation of the use of synthetic test methods is that the breaker under test must not display evidence of re-ignition or re-striking.

The known circuits do not properly represent the interaction between the source and the capacitive load under this condition. Such breakers must be tested using direct circuits.

Guide to Conducting Capacitive Current Switching Using Synthetic Circuits

This guide covers the essential requirements, test circuits, test parameters, and test procedures to follow when performing capacitive current switching tests using synthetic circuits.

Requirements

• Ensure all equipment is rated for the maximum voltage and current expected during switching.
• Use synthetic circuits designed to simulate the desired capacitive load accurately.
• Verify that protective devices are in place to prevent damage from transient voltages or currents.
• Confirm calibration of all measurement instruments prior to testing.

Test Circuits

• Design synthetic circuits incorporating capacitors to represent the load under test.
• Include switching devices capable of handling inrush currents associated with capacitive loads.
• Implement measurement points to capture voltage and current waveforms precisely.
• Integrate circuit protection elements such as snubbers or surge protectors where necessary.

Test Parameters

• Capacitive load values to be tested, including minimum and maximum capacitance.
• Voltage levels applied during switching events.
• Switching speed and timing requirements.
• Measurement duration and sampling rates for capturing transient events.
• Ambient environmental conditions during tests.

Test Procedures

• Set up the synthetic circuit according to the design specifications.
• Perform initial inspections and verify all safety protocols.
• Apply voltage to the synthetic circuit and initiate the switching sequence.
• Record all relevant electrical parameters including transient currents and voltages.
• Analyze data to confirm compliance with performance and safety criteria.
• Repeat tests under varied conditions as specified by test parameters.
• Document all test results and observations thoroughly.

This is a project that previously authorized P1492.

The purpose was to develop a document to aid the user, manufacturer, and testing laboratory in conducting capacitive switching tests.