SIST IEC 60255-22-1:1995

Overview

IEC 60255-22-1 - Measuring relays and protection equipment - Part 22-1: Electrical disturbance tests - 1 MHz burst immunity tests specifies type-test requirements to verify immunity of measuring relays and protection equipment to fast transient/burst disturbances. It applies to equipment in new condition and defines the required test severity levels, test equipment, test set‑up, test procedures and acceptance criteria. This edition aligns with IEC 61000-4-18 and includes updated test equipment and procedural changes. (First edition published as SIST IEC 60255-22-1:1995.)

Key topics and technical requirements

• Scope: Type tests only; applicable to measuring relays and protection devices in their new condition.
• Test objectives: Evaluate immunity to 1 MHz burst (fast transient) disturbances typical of substation and power system environments.
• Test severity levels: Defined levels for applied burst energy and repetition characteristics to determine device robustness.
• Test equipment: Specifies required pulse generators, coupling/decoupling networks, and measurement instrumentation consistent with IEC 61000-4-18 harmonization.
• Test set-up and procedure: Detailed electrode/coupling arrangements, grounding and wiring practices, and step-by-step procedures to ensure repeatable, comparable results.
• Acceptance criteria: Functional performance limits and allowable degradations (e.g., no damage, self‑recovery, or specified operational tolerance) after exposure.
• Alignment with IEC 61000-4-18: Incorporates changes in burst generation and measurement methodology introduced in that EMC standard.

Practical applications

• Ensure reliable operation of protection relays in environments subject to switching transients, capacitor bank operations, or transient disturbances on control and power wiring.
• Provide objective test methods for product development, type approval, and conformity assessment for manufacturers of measuring relays and protection equipment.
• Support procurement specifications and factory acceptance testing where immunity to fast transients is required.
• Help utilities and system integrators reduce misoperations and increase system availability by specifying tested, robust protection devices.

Who uses this standard

• Relay and protection equipment manufacturers
• Electromagnetic compatibility (EMC) test laboratories
• Utilities, substations and power system engineers
• Certification bodies and compliance officers
• R&D and product verification teams focused on relay immunity and reliability

Related standards

• IEC 61000-4-18 (EMC - burst/immunity test methods) - primary harmonized EMC reference
• Other parts of IEC 60255 series covering relay performance and disturbance tests

Keywords: IEC 60255-22-1, 1 MHz burst immunity tests, measuring relays, protection equipment, IEC 61000-4-18, type tests, test procedures, EMC testing.