GBT7261 type testing for relay protection and security automation equipment primarily includes electromagnetic compatibility testing (EMC), environmental reliability testing (high-temperature test, low-temperature test, damp heat test, temperature cycling test), and mechanical environmental testing (vibration test, shock test, bump test).

The Reliability Testing and Electromagnetic Compatibility Testing Center of Beijing Yizong Institute, accredited with CNAS and CMA qualifications, conducts performance testing, electromagnetic compatibility (EMC) testing, environmental reliability testing, mechanical performance testing, and insulation performance testing on relay protection and security automation equipment in accordance with the GB/T 7261-2016 "Basic Testing Methods for Relay Protection and Security Automation Equipment" standard to ensure the stability and reliability of the equipment in power systems.

I. Electromagnetic Compatibility Testing Content (EMC)

Electromagnetic compatibility testing mainly evaluates the stability and anti-interference capability of the equipment in electromagnetic interference environments, specifically including the following items:

1. Electrostatic Discharge Immunity Test

Standard: GB/T 17626.2

Test content: Simulates the impact of electrostatic discharge from the human body or objects on the equipment to verify its tolerance to electrostatic interference.

1. Radiated Radio-Frequency Electromagnetic Field Immunity Test

Standard: GB/T 17626.3

Test content: Uses radiated electromagnetic fields to simulate external radio-frequency interference (e.g., radio transmission equipment) to examine the performance stability of the equipment in strong electromagnetic fields.

1. Electrical Fast Transient/Burst Immunity Test

Standard: GB/T 17626.4

Test content: Simulates fast transient burst interference generated by switching operations, relay contact bouncing, etc., to verify the anti-interference capability of power and signal ports.

1. Surge (Impulse) Immunity Test

Standard: GB/T 17626.5

Test content: Evaluates the equipment's tolerance to surge voltages caused by lightning or high-capacity load switching.

1. Immunity to Conducted Disturbances, Induced by Radio-Frequency Fields

Standard: GB/T 17626.6

Test content: Injects radio-frequency interference into power or signal ports via coupling to test performance under conducted disturbances.

1. Power Frequency Magnetic Field Immunity Test

Standard: GB/T 17626.8

Test content: Verifies the equipment's anti-interference capability in power frequency magnetic field environments (e.g., near transformers).

1. Pulse Magnetic Field Immunity Test

Standard: GB/T 17626.9

Test content: Simulates the impact of pulse magnetic fields generated by lightning strikes or short-circuit faults on the equipment.

1. Damped Oscillatory Magnetic Field Immunity Test

Standard: GB/T 17626.10

Test content: Evaluates the equipment's immunity to oscillatory magnetic fields generated by power system switching operations.

1. Voltage Dips, Short Interruptions, and Voltage Variations Immunity Test

Standard: GB/T 17626.11

Test content: Simulates abnormal conditions such as grid voltage fluctuations and short interruptions to verify the equipment's continuous operation capability.

II. Environmental Reliability Testing Content

Environmental testing primarily examines the adaptability and reliability of the equipment under different environmental conditions, including the following items:

1. High-Temperature Test

Test content: Verifies the performance and stability of the equipment at the specified maximum operating temperature (e.g., +55°C or +70°C).

1. Low-Temperature Test

Test content: Tests the equipment's startup, operation, and storage capabilities at the minimum operating temperature (e.g., -10°C or -25°C).

1. Damp Heat Test

Includes constant damp heat and alternating damp heat tests:

Constant Damp Heat: Performance after long-term exposure to high temperature and high humidity (e.g., 40°C, 93% RH).

Alternating Damp Heat: Simulates the impact of daily temperature and humidity variations on the equipment.

1. Temperature Change Test

Test content: Verifies the equipment's thermomechanical adaptability under rapid temperature cycling (e.g., -25°C to +70°C).

1. Vibration Test

Standard: GB/T 11287

Test content: Simulates mechanical vibrations during transportation or operation, including sinusoidal and random vibrations.

1. Shock Test

Test content: Verifies the equipment's ability to withstand mechanical shocks (e.g., collisions, drops).

1. Bump Test

Test content: Simulates continuous impacts experienced by the equipment during transportation or installation.

1. Salt Spray Test (if applicable)

Test content: Evaluates the corrosion resistance of the equipment in coastal or industrially polluted environments.

1. Enclosure Protection Test (IP Rating)

Standard: GB/T 4208

Test content: Verifies the dust and water resistance of the equipment enclosure (e.g., IP51, IP54).

1. Long-Term Stability Test

Test content: Operates the equipment continuously under rated conditions for a specified duration (e.g., 1000 hours) to assess its reliability.

III. Additional Notes

1. Test Severity Level: The severity level of different tests (e.g., temperature range, interference intensity) should be determined based on the product's application scenario (e.g., indoor/outdoor).
2. Performance Criteria: After testing, the equipment must meet the performance criteria specified by the standard (e.g., normal functionality, errors within limits).
3. Other Tests: The standard may also include non-EMC/environmental tests such as insulation withstand voltage and mechanical lifespan tests.

For more detailed technical parameters (e.g., specific test levels, durations), it is recommended to refer directly to the original text or appendices of the GB/T 7261-2016 standard.

The GB/T 7261-2016 comprehensive testing provided by the Beijing Yizong Institute Environmental Reliability Testing and Electromagnetic Compatibility Testing Center fully covers key tests such as EMC immunity, environmental adaptability, and mechanical reliability for relay protection and security automation equipment, ensuring long-term stable operation in power systems.

EMC Testing: Focuses on performance under interference such as electrostatic discharge, radio frequency, surges, and voltage dips.

Environmental Testing: Covers harsh conditions including high/low temperatures, damp heat, vibration, and shock.

Severity Level: Selected based on the application scenario (indoor/outdoor), e.g., Level 3 is suitable for harsh industrial environments.