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Introduction to Standard Number 2310, Revision 6
Inspection, Reconditioning and Testing of
Medium Voltage Switchgear

I. Introduction
Switchgear is a broad term that covers electrical distribution systems made up of metal clad or metal enclosed cabinets containing switches or circuit breakers. The switches might be fused or non-fused. They might be air break or vacuum break. While manual break devices are the most common, medium voltage switchgear well could be electrical closed and or opened. Circuit breakers may be air break, oil break or vacuum breaker, even SF6. These will always be electrically closed and opened. Where the breakers or switches are electrically closed, opened or both, there will be a requirement for control power source and control power wiring. The source might be a remote separate source of low voltage brought in from outside the switchgear or it might be provided by transforming line power down to the necessary control voltages. This standard covers the cabinets, bussing, relaying and control circuits only.

Individual standards in this section include:

  • 2310 Medium Voltage Switchgear

    II. Components
    Parts and assemblies to be reconditioned under Section 2300 Medium Voltage Switchgear include but are not limited to:

    • Cabinet or structure
    • Doors
    • Door Closures
    • Interlocks
    • Bus
    • Bus splices
    • Bus Insulation and standoff insulators
    • Bus Supports
    • Section Bus Barriers
    • Control circuit components
    • Control and instrument transformer drawer, tray or trunion
    • Control Relays
    • Protective Relays
    • Meters and instruments
    • Surge Arrestors
    III. Testing and Inspection
    PEARL Section 2300 Medium Voltage Switchgear standards begins with the definition of the term "Reconditioning" as "the process of returning electrical equipment to safe and reliable operating condition based upon the design of the original manufacturer at the time of manufacturing." This is followed by reference tables used to calculate test results and tolerances and the necessary test equipment required by the medium voltage switchgear standards. The medium voltage switchgear standards continue with a "Recondition Evaluation," which is a detailed inspection of all parts of the medium voltage switchgear, including but not limited to the components listed above.

    PEARL Section 2300 Medium Voltage Switchgear reconditioning standards require the use of other standards covering major subassemblies that can also be reapplied as independent components. These may include:

    • Section 1200 Low Voltage Circuit Breakers
    • Section 1400 Low Voltage Transformers
    • Section 1700 Protection Relays
    • Section 1800 Low Voltage Contactors and Relays
    • Section 2100 Medium Voltage Disconnect Switches
    • Section 2200 Medium Voltage Circuit Breakers
    • Section 3100 Low Voltage & Medium Voltage Fuses

    Section I for PEARL Section 2300 Medium Voltage Switchgear, begins with reference table identification and identification of the test equipment necessary to complete the standard, including one or more:

    1. Insulation Resistance Test Set (Megohmeter) 1000 Vdc minimum

    One of the following pieces of test equipment is required to perform the overpotential testing requirements of this reconditioning standard if it is required by the customer:

    1. AC Overpotential Test Set
    2. DC Overpotential Test Set
    3. Digital or analog multimeter

    Section II Recondition Evaluation-Inspection and Testing identifies each component and assembly part that must be inspected to determine the components viability and scope of reconditioning required to bring the component back to original operating condition. Results and notes from the pre-reconditioning inspection and test are recorded in the PEARL Reconditioning Evaluation and Test forms that accompany each respective standard.

    IV. Reconditioning
    Section III Reconditioning Procedures describes how to recondition each component and assembly, beginning with the disassembly of the motor control unit down to its major subassemblies. Reconditioning for medium voltage switchgear includes:

    • Disassembly
    • Cleaning
    • Degreasing
    • Deburring
    • Plating
    • Painting
    • Lubricating
    • Adjusting

    Assembly of the reconditioned components and subassemblies is followed by final inspection and testing. As with all testing, inspection, and reconditioning operations, final inspection and test results are recorded onto the Evaluation and Test forms included with the standard. If a PEARL certified technician follows the reconditioning standard, the medium voltage switchgear assembly is eligible for a Blue PEARL Reconditioned Quality Seal.

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