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CAN CSA C60871-2-03: Endurance Testing of High-Voltage Shunt Capacitors for AC Power Systems
Comprehensive Guide to the Canadian Standard for Shunt Capacitor Endurance Testing
Scope and Application
CAN CSA C60871-2-03 is the Canadian adoption of IEC 60871-2:1999, titled Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V – Part 2: Endurance testing. This standard specifies endurance test requirements and acceptance criteria for shunt capacitors intended for use in AC power systems with rated voltages exceeding 1 000 V. The tests are designed to verify the long-term reliability and thermal stability of capacitor units under prolonged operational stresses, including voltage, temperature, and switching transients.
The standard applies to both single-phase and three-phase capacitor units, including those used in series or shunt configurations within substations and industrial power networks. It is referenced by utilities, capacitor manufacturers, and testing laboratories as the benchmark for endurance qualification in the Canadian regulatory context.
Tip: Although CAN CSA C60871-2-03 is identical to IEC 60871-2:1999, Canadian users must follow the local adoption notes and any amendments issued by the Standards Council of Canada.
Technical Requirements and Test Procedures
CAN CSA C60871-2-03 defines four mandatory endurance tests to be performed on capacitor units. Each test simulates a specific degradation mechanism encountered during service life. The tests shall be conducted consecutively on the same test specimen unless otherwise allowed by the standard.
1. Thermal Stability Test
This test verifies that the capacitor can reach and maintain thermal equilibrium under rated voltage and at the highest ambient temperature category. The capacitor is energised at its rated voltage while placed in a chamber maintained at the maximum ambient temperature (typically +40 °C or +50 °C, as per the unit’s temperature category). The test continues until the internal temperature stabilises (change ≤ 1 °C over 3 h). The dielectric dissipation factor (tan δ) and capacitance are measured before and after the test.
2. Ageing (Accelerated Life) Test
The ageing test exposes the capacitor to an elevated voltage (typically 1.15 to 1.25 times the rated voltage) for a defined duration (e.g., 1000 h) at an elevated ambient temperature. The purpose is to accelerate dielectric ageing and identify failure modes. After the test, the capacitance change must not exceed the limit specified in the standard, and no dielectric breakdown or leakage shall occur.
| Test Parameter | Requirement per CAN CSA C60871-2-03 |
|---|---|
| Test voltage (ageing) | 1.15 UN to 1.25 UN |
| Test duration | 1 000 h (or equivalent accelerated duration) |
| Ambient temperature | Top ambient category level (e.g., +40 °C or +50 °C) |
| Capacitance change limit | ≤ 2 % from initial value |
| Tan δ limit (after test) | ≤ 0.25 % for polypropylene film capacitors |
3. Overvoltage Cycle Test
This test simulates voltage excursions caused by switching operations or load rejection. The capacitor is subjected to a specified number of overvoltage cycles (e.g., 100 cycles) at a voltage level of 1.1 to 1.15 UN for a duration of 1 s per cycle with a recovery interval. No flashover or disruptive discharge is permitted.
4. Sealing and Internal Discharge Test
The capacitor unit is examined for liquid leakage (if liquid-impregnated) after being heated to the maximum ambient temperature and then cooled. Additionally, the internal discharge resistor (if present) is tested to verify that the residual voltage drops below 75 V within 10 minutes after disconnection from the supply.
Warning: Overvoltage cycles can generate high inrush currents. Use current-limiting reactors and proper protective relaying when setting up this test in the laboratory.
Implementation Highlights
Implementing CAN CSA C60871-2-03 requires a controlled test environment, accurate measurement instrumentation, and strict adherence to the sequence of tests. Facilities seeking accreditation should consider the following aspects:
- Test chamber: Must be capable of maintaining set temperature within ±2 °C for the duration of the test.
- Power supply: A variable AC source with low harmonic distortion (THD < 2 %) is required to prevent additional stress.
- Measurement bridge: For precise capacitance and tan δ measurements, a high-voltage Schering bridge or equivalent with accuracy class 0.5 or better should be used.
- Data logging: Continuous monitoring of voltage, current, temperature, and tan δ is recommended to detect early signs of degradation.
Good practice: Use at least three test specimens for each capacitor design to obtain statistically valid results. The standard permits only one failure out of the sample; if two failures occur, the design fails the endurance test.
The standard also specifies that capacitors that have passed the endurance testing are considered to have a reasonable life expectancy under normal service conditions. Manufacturers are encouraged to include the endurance test results in their type test reports to support compliance with applicable Canadian electrical codes and utility specifications.
Compliance and Regulatory Notes
CAN CSA C60871-2-03 is part of a family of CSA standards for power capacitors (C60871 series). It is harmonised with the corresponding IEC standard, maintaining technical equivalence. In Canada, compliance with this standard is often referenced by provincial safety authorities and by major utility procurement specifications. While not a mandatory safety code by itself, it serves as a de facto requirement for capacitor qualification in many high‑voltage installations.
To claim compliance, the manufacturer must:
- Conduct the tests according to the procedures defined in the standard.
- Document all test results, including initial measurements, intermediate readings, and final acceptance criteria.
- Submit a test report that includes the capacitor rating, temperature category, test voltages, durations, and any anomalies observed.
- Affirm that the test specimen is representative of the production units.
Important: CAN CSA C60871-2-03 does not cover capacitors rated below 1 000 V (those are covered by CAN CSA E60871-1 or other standards). Additionally, the standard does not address capacitors with internal fuses or those intended for series compensation applications; relevant supplementary standards apply.
The standard is routinely reviewed by CSA Technical Committee on Power Capacitors. Users are advised to verify they are using the latest edition, as amendments may introduce new temperature categories or revised test durations. The current edition remains the 2003 version, reaffirmed to align with IEC 60871-2:1999. Future revisions are expected to consider evolving dielectric materials and higher operating voltage levels.
Q: What is the purpose of CAN CSA C60871-2-03?
A: It defines endurance test methods for high-voltage shunt capacitors (above 1 000 V) to verify long-term reliability, thermal stability, and resistance to overvoltages and ageing.
A: It defines endurance test methods for high-voltage shunt capacitors (above 1 000 V) to verify long-term reliability, thermal stability, and resistance to overvoltages and ageing.
Q: How does CAN CSA C60871-2-03 differ from the international IEC 60871-2:1999?
A: The Canadian standard is technically identical to the IEC edition, but includes CSA-specific administrative requirements, such as adoption notes, temperature classification references to Canadian climate conditions, and recognition by the Standards Council of Canada.
A: The Canadian standard is technically identical to the IEC edition, but includes CSA-specific administrative requirements, such as adoption notes, temperature classification references to Canadian climate conditions, and recognition by the Standards Council of Canada.
Q: What test equipment is essential for compliance?
A: A temperature-controlled chamber (±2 °C), a high-voltage AC source with low distortion, a capacitance and tan δ measuring bridge (accuracy 0.5 % or better), and data acquisition for continuous monitoring of voltage, current, temperature, and dissipation factor.
A: A temperature-controlled chamber (±2 °C), a high-voltage AC source with low distortion, a capacitance and tan δ measuring bridge (accuracy 0.5 % or better), and data acquisition for continuous monitoring of voltage, current, temperature, and dissipation factor.
Q: Is endurance testing mandatory for all shunt capacitors in Canada?
A: While not a legal requirement by itself, many provincial utility codes and procurement specifications mandate type testing in accordance with CAN CSA C60871-2-03. It is effectively required for capacitors to be accepted in most Canadian high-voltage power systems.
A: While not a legal requirement by itself, many provincial utility codes and procurement specifications mandate type testing in accordance with CAN CSA C60871-2-03. It is effectively required for capacitors to be accepted in most Canadian high-voltage power systems.
© 2026 International Standards Technical Review. This article provides general technical guidance; always refer to the latest official standard for definitive requirements.