Routine Test Requirements in HV CBs

Routine tests are essential in the manufacturing process of high voltage (HV) circuit breakers. These tests are conducted on each unit before delivery to ensure the quality, reliability, and performance of the circuit breakers. Routine tests verify the correct assembly and functionality of every individual circuit breaker, ensuring they meet the stringent requirements set by international standards such as IEC and ANSI. The routine tests ensure that each circuit breaker functions correctly and meets the specified standards. A complete routine test report, signed by the quality department, is issued for each circuit breaker and delivered to the customer as part of the order documentation.

---

 

Summary of Routine Tests

The routine tests can be carried out in accordance with ANSI or IEC standards. The summary of routine tests includes:

Nameplate Check:

Ensures all information on the nameplate is accurate and matches the specifications. This includes verifying ratings, manufacturer details, and serial numbers.

Resistance Test (Auxiliary Circuit):

A low-resistance ohmmeter is used to measure the resistance in auxiliary circuits, ensuring it is within the specified range.

Auxiliary Check

Verifies the correct operation of auxiliary switches, interlocks, and control circuits. This includes checking wiring and connection integrity.

Mechanical Operations Test

The breaker is operated multiple times to ensure all mechanical parts move correctly without any hindrance. This test checks for smooth operation of the opening and closing mechanisms.

Timing Test

Specialized equipment measures the time taken for the breaker to open and close. The results are compared against specified limits to ensure compliance.

Resistance Test (Main Circuit)

Measures the resistance across the main circuit contacts to ensure minimal resistance, which indicates good contact and minimal energy loss.

Insulation Resistance (pre and post voltage withstand test)

The purpose of this test is to evaluate the condition of the insulation and detect any potential issues that could lead to equipment failure or safety hazards.

Voltage Withstand Test (Auxiliary Circuit):

A high voltage is applied to the auxiliary circuits to check for insulation integrity. The test ensures that auxiliary circuits can handle operational voltages without breakdown.

Power Frequency Voltage Test (Main Circuit)

A high-power frequency voltage is applied to the main circuit to ensure it can withstand operational stresses. This test is crucial for verifying the dielectric strength of the main circuit.

Tightness Test

Ensures all components are properly sealed. The breaker is checked for leaks, especially in SF6 gas-filled compartments, to ensure no gas escapes.  

---

Routine Tests

Routine tests are integral to the quality assurance process for high voltage circuit breakers. These tests, conducted in accordance with international standards such as IEC and ANSI, verify the assembly and functionality of each breaker. They ensure that every unit delivered to customers meets stringent performance and safety standards, providing reliable protection for electrical power systems. Routine test certificates are provided with each delivery, guaranteeing the breaker’s compliance with the specified requirements.