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Products / High Voltage Apparatus
High Voltage Apparatus
Choose high-voltage apparatus by the electrical function required at the installation point: interrupt a circuit, establish an isolation point, provide a signal for metering or protection, or address an overvoltage risk. Each function requires its own equipment ratings, connections and operating arrangement.
Product routes
Match the device to its electrical function
Review the function and interfaces, then view the equipment or discuss the project requirements.
Outdoor Vacuum Circuit Breaker
An outdoor vacuum circuit breaker for a defined switching and interruption duty.
- Typical duty
- Outdoor circuit switching and interruption on a distribution line or substation connection. Describe the switching and fault duty, installation geometry and protection/control interface together.
- Selection check
- Match rated duty, mounting dimensions, trip/close supply and protection connections to the actual installation, particularly when replacing existing equipment.
High Voltage Disconnector
An indoor or outdoor isolation-point arrangement.
- Typical duty
- An isolation point within indoor equipment or on an outdoor line. State the operating sequence and adjacent switching devices.
- Selection check
- Review the isolation duty and the formal device specification; do not substitute an isolator for a circuit-interruption requirement.
High Voltage Instrument Transformer
Current- or voltage-signal equipment for metering and protection.
- Typical duty
- Metering or protection circuits that need a current or voltage signal from the primary system. Separate CT and VT duties and identify the connected secondary devices.
- Selection check
- Match CT or VT duty, ratio, accuracy, burden, mounting and terminal arrangement for the connected meter or relay.
Surge Arrester
A surge-protection point in a defined network context.
- Typical duty
- A surge-protection requirement at a defined point in the network and in a known installation environment.
- Selection check
- Select a specific arrester only after its ratings and protection coordination are checked against the network and protected equipment.
Decision guide
Do not substitute one apparatus function for another
One installation may need several functions, but each apparatus type answers a different technical question.
| Category | Primary task | Key interface to establish | Selection boundary |
|---|---|---|---|
| Outdoor Vacuum Circuit Breaker | Outdoor circuit switching and interruption | Circuit duty, mounting and protection/control connections | Do not assume interchangeability with an existing breaker without mounting and control checks |
| High Voltage Disconnector | Isolation point in the intended switching arrangement | Location, operating mechanism and adjacent devices | Do not assign a breaker or load-switch duty without a formal device specification |
| High Voltage Instrument Transformer | Current or voltage signal for meters and relays | CT/VT ratio, secondary burden, accuracy and terminals | Do not treat this as a power transformer or assume CT and VT are interchangeable |
| Surge Arrester | Surge-protection point in the network | Protected equipment, system/earthing arrangement and mounting | Do not set a specific arrester rating without network and protection-coordination data |
Project sequence
Start with the function shown on the single-line diagram
- 01Name the task
Mark whether the point requires interruption, isolation, current or voltage measurement, or surge protection. If several functions are needed, list them separately.
- 02Identify the circuit conditions
Record system voltage and frequency, current or fault conditions where applicable, and the intended protection or metering scheme.
- 03Show the installation interface
Describe indoor or outdoor location, support structure, mounting clearances, adjacent equipment and cable or conductor connections.
- 04Check secondary and operating links
For breakers and disconnectors identify operating and interlock requirements; for CT/VT identify secondary devices and terminals; for surge protection identify the protected point and earthing context.
Equipment that appears in the same bay or cabinet may solve different problems. The device task must be established before selecting a category.
Engineering inputs
Bring the information that changes the route.
Outdoor Vacuum Circuit Breaker
- Circuit voltage, current and fault-duty requirement
- Switching application and protection scheme
- Mounting and conductor arrangement
- Trip/close supply and auxiliary contacts
- Existing nameplate and control drawing for replacement
High Voltage Disconnector
- Indoor or outdoor position
- Isolation and operating sequence
- System voltage, current and short-time duty
- Mounting dimensions and mechanism
- Earthing-switch or interlock requirement
High Voltage Instrument Transformer
- Current or voltage measurement task
- Primary and secondary values or ratio
- Metering or protection use
- Accuracy and burden requirement
- Terminal, insulation and mounting drawing
Surge Arrester
- Protected equipment and point of installation
- System and earthing arrangement
- Environmental and mounting conditions
- Relevant protection-coordination requirement
- Existing specification, if replacing an arrester
Procurement questions
Questions to resolve before specifying the equipment.
Can a disconnector replace a vacuum circuit breaker?
A breaker addresses circuit interruption; a disconnector provides an isolation point in the switching arrangement. Check the single-line diagram, operating sequence and device specifications before selecting either.
Why are current and voltage transformers grouped but not combined in one selection?
A CT supplies a scaled current signal and a VT supplies a scaled voltage signal. Their ratios, connected secondary devices, burden, accuracy and terminals must be specified for the actual measurement or protection task.
Is a model code enough to replace an outdoor breaker?
No. Include the existing nameplate and installation, terminal and control drawings. Rated duty, mounting, trip and close supply, auxiliary contacts and protection interface all need comparison with the proposed configuration.
What information is needed for an indoor versus outdoor apparatus choice?
State the equipment location and exposure, support or enclosure arrangement, mounting dimensions, access, and connection to adjacent devices. Electrical duty alone does not define the physical installation.
Can a surge arrester be chosen from system voltage alone?
No. Identify the protected equipment, installation point, system and earthing arrangement, and existing protection design. Model-specific rating and performance data must then be checked against that duty.
Do these four categories share one test certificate or rating table?
No. Each apparatus type and model has its own applicable ratings, drawings and test documentation. Request the documents for the exact equipment under consideration.