Frequently Asked Questions from TANO CABLE

RS485 cable is a kind of communication cable specially designed for RS485 bus communication. Here are its key points:
 
Application
 It is mainly used in the RS485 bus, which is a widely used serial communication standard in the field of industrial automation. It is suitable for occasions requiring long-distance data transmission and multi-point communication, such as factory automation, building automation, and security systems.
Features
- It usually adopts a twisted pair structure, which can effectively reduce electromagnetic interference and crosstalk, and improve the stability and reliability of data transmission.
- It has the characteristics of long transmission distance. In some cases, the transmission distance can reach several hundred meters or even longer.
- It supports multi-point communication, and multiple devices can be connected to the same RS485 bus for communication.
Interface
 The common interface types include terminal blocks, DB9 connectors, etc., which are used to connect devices such as controllers and sensors.

OPGW is an abbreviation for Optical Fiber Composite Overhead Ground Wire. It is a special cable that combines optical fibers with a grounding wire, mainly used in overhead power transmission lines. Here are its key features and functions:
 
Structure: 
It consists of optical fibers enclosed in a metal sheath, surrounded by a stranded wire (usually made of aluminum alloy, steel, etc.) to form a cable that can be used as both a grounding wire and an optical communication medium.
Functions:
- Grounding and Lightning Protection: As an overhead ground wire, it can protect the power line from lightning strikes and provide a grounding path.
- Optical Communication: The optical fibers inside enable high-speed data transmission, supporting power system communication, monitoring, and control.
Advantages:
It integrates power grounding and communication functions, saving installation space and costs, and is widely used in high-voltage and ultra-high-voltage power grids.

Power distribution refers to the final stage in the delivery of electric power from generation sources to end users, such as homes, businesses, and industries. It involves the network of substations, transformers, and power lines that carry electricity from the transmission system and distribute it to consumers. Here’s a breakdown of the process:

1. Generation: Electricity is produced at power plants using various energy sources like coal, natural gas, nuclear, hydro, wind, or solar.

2. Transmission: High-voltage transmission lines transport electricity over long distances from power plants to substations. This is done at high voltages to reduce energy loss.

3. Substations: At substations, transformers reduce the high voltage electricity to lower levels suitable for distribution.

4. Distribution: The lower voltage electricity is then sent through a network of distribution lines to reach local areas. These lines can be overhead or underground.

5. Service Lines: Finally, service lines deliver electricity from the distribution lines directly to homes and businesses. Transformers near the end-use locations further reduce the voltage to the levels needed by appliances and equipment.

The power distribution system is crucial for ensuring that electricity is delivered reliably and efficiently to meet the demands of consumers. It includes various components like distribution transformers, circuit breakers, and meters, and is managed by utility companies or local distribution networks

Medium voltage electrical products are components and systems designed to operate within the medium voltage range, typically defined as voltages between 1 kV (1,000 volts) and 52 kV (52,000 volts). These products are used in various applications, including power distribution, industrial facilities, and renewable energy systems. Here are some common medium voltage electrical products:

1. Switchgear:
   - Air Insulated Switchgear (AIS): Uses air as the insulating medium to isolate electrical components.
   - Gas Insulated Switchgear (GIS): Uses sulfur hexafluoride (SF6) gas for insulation, allowing for more compact designs.
   - Ring Main Units (RMUs): Compact switchgear used in secondary distribution networks.

2. Circuit Breakers:
   - Vacuum Circuit Breakers: Use a vacuum to extinguish the arc when interrupting the circuit.
   - SF6 Circuit Breakers: Use SF6 gas for arc quenching and insulation.
   - Oil Circuit Breakers: Use oil as the insulating and arc-quenching medium (less common today).

3. Transformers:
   - Distribution Transformers: Step down medium voltage to low voltage for end-use applications.
   - Power Transformers: Used in substations for stepping up or down voltage levels in the power grid.
   - Dry-Type Transformers: Use air or resin for cooling and insulation, suitable for indoor applications.

4. Cables and Accessories:
   - Medium Voltage Cables: Designed to carry medium voltage power, often with XLPE (cross-linked polyethylene) insulation.
   -  Cable Joints and Terminations: Used to connect and terminate medium voltage cables securely.

5. Protection and Control Devices:
   - Relays: Protective relays monitor electrical parameters and trigger circuit breakers in case of faults.
   - Fuse*: Protect circuits by melting and interrupting the flow of current during overcurrent conditions.
   - Surge Arresters: Protect equipment from voltage spikes and surges.

6. Capacitors and Reactors:
   - Power Capacitors: Used for power factor correction and voltage stabilization.
   - Reactors: Limit fault currents or compensate for reactive power in the system.

7. Motor Starters and Controllers:
   - Soft Starters: Gradually ramp up the voltage to reduce inrush current during motor startup.
   - Variable Frequency Drives (VFDs): Control the speed and torque of medium voltage motors.

8. Busbars and Bus Ducts:
   - Busbars: Conductors used to distribute power within switchgear or substations.
   - Bus Ducts: Enclosed systems for transmitting power in industrial or commercial settings.

High voltage electrical products are devices and equipment designed to handle, transmit, and distribute electrical energy at high voltages, typically above 1,000 volts (1 kV) for alternating current (AC) and 1,500 volts for direct current (DC). These products are essential for power generation, transmission, and distribution systems. Here are some common high voltage electrical products:

1. Transformers:
   - Power Transformers: Used to step up or step down voltage levels in power transmission and distribution networks.
   - Instrument Transformers: Including current transformers (CTs) and voltage transformers (VTs), used for measuring and protective relaying.

2. Circuit Breakers:
   - High Voltage Circuit Breakers: Designed to interrupt or break the flow of electricity in high voltage circuits during fault conditions.
   - SF6 Circuit Breakers: Use sulfur hexafluoride gas to extinguish arcs.
   - Vacuum Circuit Breakers: Use a vacuum to extinguish arcs.

3. Switchgear:
   - High Voltage Switchgear: Combines various electrical devices like circuit breakers, fuses, and switches to control, protect, and isolate electrical equipment.
   - Gas-Insulated Switchgear (GIS): Uses pressurized sulfur hexafluoride gas for insulation.

4. Insulators:
   - Porcelain Insulators: Used to support and insulate electrical conductors.
   - Glass Insulators: Similar to porcelain insulators but made of glass.
   - Composite Insulators: Made from polymer materials, offering lightweight and high performance.

5. Cables and Accessories:
   - High Voltage Cables: Designed to carry high voltage electricity over long distances.
   - Cable Joints and Terminations: Used to connect and terminate high voltage cables.

6. Surge Arresters:
   - Used to protect electrical equipment from voltage spikes and surges caused by lightning or switching events.

7. Capacitors:
   - High Voltage Capacitors: Used in power systems for power factor correction, filtering, and energy storage.

8. Relays and Protection Devices:
   - Protective Relays: Monitor electrical parameters and trip circuit breakers in case of faults.
   - Differential Relays: Protect transformers and generators by detecting internal faults.

9. Busbars and Connectors:
   - High Voltage Busbars: Conduct electricity within switchgear, substations, and other high voltage installations.
   - Connectors: Used to join high voltage cables and busbars securely.

10. Reactors:
    - Shunt Reactors: Used to control voltage levels and improve power system stability.
    - Series Reactors: Limit short-circuit currents and control load sharing.

11. Disconnectors and Earthing Switches:
    - Disconnectors: Isolate sections of the electrical network for maintenance.
    - Earthing Switches: Ground isolated sections for safety during maintenance.

12. High Voltage Testing Equipment:
    - Used to test the insulation and performance of high voltage equipment, including hipot testers, partial discharge detectors, and insulation resistance testers.

These products are critical components in the infrastructure of electrical power systems, ensuring the safe and efficient transmission and distribution of electricity.

Power transmission and power distribution are two distinct stages in the process of delivering electricity from power plants to consumers. Here are the main differences between them:

1. Voltage Levels:
   - Transmission: High voltage levels (typically 69 kV to 765 kV or higher) are used to transmit electricity over long distances. High voltages reduce energy losses due to resistance in the wires.
   - Distribution: Lower voltage levels (typically below 69 kV, often 11 kV to 33 kV for primary distribution and 110 V to 480 V for secondary distribution) are used to deliver electricity to end-users. Lower voltages are safer and more suitable for consumer use.

2. Distance:
   - Transmission: Involves the long-distance movement of electricity from power plants to substations, often spanning hundreds of miles.
   - Distribution: Involves the local delivery of electricity from substations to homes, businesses, and other end-users, typically over shorter distances.

3. Infrastructure:
   - Transmission: Utilizes high-voltage transmission lines, often supported by large steel towers or pylons. These lines are part of the bulk power system.
   - Distribution: Uses smaller poles or underground cables to deliver electricity to individual consumers. The infrastructure is more localized and less extensive than transmission networks.

4. Purpose:
   - Transmission: Focuses on the efficient and bulk transfer of electricity over long distances with minimal losses.
   - Distribution: Focuses on delivering electricity safely and reliably to individual consumers at usable voltage levels.

5. Components:
   - Transmission: Includes high-voltage transmission lines, transformers (to step-up voltage at the power plant and step-down at substations), and substations.
   - Distribution: Includes distribution lines, transformers (to further step-down voltage), service lines, and meters.

6. Control and Management:
   - Transmission: Managed by transmission system operators (TSOs) or regional transmission organizations (RTOs), focusing on grid stability, load balancing, and long-term planning.
   - Distribution: Managed by distribution system operators (DSOs), focusing on local reliability, customer service, and maintenance of the distribution network.

7. Regulation:
   - Transmission: Often subject to federal or national regulatory oversight due to its impact on interstate or national power flow and grid reliability.
   - Distribution: Typically regulated at the state or local level, focusing on consumer protection and local service quality.

 8. Load Characteristics:
   - Transmission: Deals with large, aggregated loads from multiple distribution networks and large industrial customers.
   - Distribution: Deals with smaller, individual loads from residential, commercial, and small industrial customers.

Understanding these differences is crucial for the efficient and reliable operation of the electrical grid, ensuring that electricity is generated, transmitted, and distributed effectively to meet consumer demand.