Reliable power transmission depends on strong and stable connections. In high-voltage systems, one of the most critical interfaces sits between underground cables and gas-insulated switchgear. At this point, 그만큼 GIS Termination plays a decisive role. At the 132kV level, even minor design or installation issues can lead to serious failures. 그러므로, engineers pay close attention to every detail of this component.
As cities continue to expand, substations often move underground or into compact spaces. 따라서, gas-insulated switchgear (GIS) becomes more common. At the same time, utilities demand higher reliability and lower maintenance. 이러한 이유로, the demand for high-quality 132kV cable GIS termination solutions continues to grow.
What Is a GIS Termination?
ㅏ GIS Termination connects a high-voltage cable to gas-insulated switchgear. It creates a controlled transition from the cable insulation system, usually XLPE, into the SF₆ gas environment inside the GIS.
하지만, this transition is not simple. The electric field changes significantly at the interface. 결과적으로, engineers must carefully manage electrical stress, maintain insulation performance, and prevent partial discharge.
실용적인 측면에서, a GIS termination allows electricity to flow safely and efficiently from the cable into the switchgear. Without this controlled interface, system stability would quickly degrade.
Why 132kV GIS Cable Termination Is Important
In modern power systems, reliability remains the top priority. A failure at the termination point can shut down an entire substation and disrupt supply.
첫 번째, GIS terminations support compact substation layouts. Because GIS equipment uses enclosed gas insulation, it requires far less space than traditional air-insulated systems. 그러므로, it suits dense urban environments.
두번째, they improve operational reliability. The sealed structure protects internal components from dust, 수분, and pollution. 게다가, it reduces the impact of environmental conditions.
게다가, a properly designed 132kV GIS termination minimizes electric stress concentration. 결과적으로, both the cable and the switchgear can operate safely over a longer service life.
Main Components of a 132kV GIS Termination
A GIS termination includes several essential components. Each one contributes to electrical stability and mechanical strength.
스트레스 제어 시스템
To begin with, the stress control system manages the electric field at the cable end. Without proper control, the field becomes uneven and may cause insulation failure. 그러므로, engineers use stress cones or field grading materials to distribute the electric field evenly.
Insulating Body
다음, the insulating body provides the primary dielectric barrier. It separates the high-voltage conductor from the grounded GIS enclosure. 일반적으로, manufacturers use silicone rubber or epoxy resin because these materials offer strong insulation and thermal stability.
도체 연결
At the same time, the conductor must connect securely to the GIS terminal. A reliable connection reduces resistance and prevents overheating. In most cases, technicians use compression or bolted connectors to achieve this.
Sealing System
그 동안에, the sealing system prevents SF₆ gas leakage and blocks moisture ingress. Because GIS depends on stable gas pressure, effective sealing remains essential for long-term performance.
Flange and Housing
마지막으로, the flange connects the termination to the GIS equipment, while the housing protects internal components from mechanical damage. 함께, these parts ensure proper alignment and durability.
Types of GIS Termination for 132kV Cables
Different applications require different designs. 그러므로, engineers select the appropriate type based on project conditions.
Dry Type GIS Termination
In many modern substations, dry type terminations are preferred. They use solid insulation materials instead of oil. 결과적으로, they offer easier maintenance and reduced environmental risk.
Oil-Filled GIS Termination
반면에, oil-filled terminations provide excellent insulation performance. 하지만, they require careful sealing and regular maintenance. 그러므로, they are less common in newer installations.
Plug-In GIS Termination
게다가, plug-in terminations allow faster installation. Because of their modular design, they reduce downtime and improve efficiency, especially in prefabricated GIS systems.
Cable Conductor Size Table (25 mm² ~ 3000 mm²)
When selecting a GIS Termination, conductor size becomes a key factor. It influences current capacity, thermal behavior, and mechanical compatibility. 그러므로, engineers must evaluate cable size carefully.
Conductor Cross-Section and Technical Parameters
| 지휘자 크기 (mm²) | 대략. AWG/MCM | 도체 직경 (mm) | DC 저항 (Ω/km @20°C) | Typical Current Capacity (ㅏ) | Application Level |
|---|---|---|---|---|---|
| 25 | 4 AWG | 5.6 | 0.727 | 150–180 | 제어 / small load |
| 35 | 2 AWG | 6.7 | 0.524 | 180–220 | Light distribution |
| 50 | 1/0 AWG | 8.0 | 0.387 | 220–270 | Distribution |
| 70 | 2/0 AWG | 9.6 | 0.268 | 260–320 | Medium load |
| 95 | 3/0 AWG | 11.0 | 0.193 | 300–370 | Substation feeder |
| 120 | 4/0 AWG | 12.4 | 0.153 | 340–420 | Medium HV |
| 150 | 300 MCM | 13.9 | 0.124 | 380–470 | Transmission |
| 185 | 350 MCM | 15.5 | 0.099 | 420–520 | Transmission |
| 240 | 500 MCM | 17.5 | 0.075 | 480–600 | 132kV standard |
| 300 | 600 MCM | 19.5 | 0.060 | 550–680 | Main feeder |
| 400 | 800 MCM | 22.6 | 0.047 | 650–800 | Heavy load |
| 500 | 1000 MCM | 25.2 | 0.036 | 750–920 | HV transmission |
| 630 | 1250 MCM | 28.3 | 0.028 | 850–1050 | Common 132kV |
| 800 | 1600 MCM | 31.9 | 0.022 | 1000–1200 | Bulk power |
| 1000 | 2000 MCM | 35.7 | 0.017 | 1150–1400 | Large substations |
| 1200 | 2500 MCM | 39.1 | 0.015 | 1300–1550 | Grid backbone |
| 1400 | — | 42.2 | 0.013 | 1400–1700 | Extra heavy load |
| 1600 | — | 45.2 | 0.011 | 1550–1850 | Large transmission |
| 2000 | — | 50.5 | 0.009 | 1750–2100 | Major grid |
| 2500 | — | 56.4 | 0.007 | 2000–2400 | Ultra high demand |
| 3000 | — | 61.8 | 0.006 | 2200–2600 | Extreme capacity |
How Conductor Size Affects GIS Termination Design
Conductor size directly influences the design of a GIS termination. 첫 번째, larger conductors require stronger mechanical support. 결과적으로, the termination must handle higher weight and installation stress.
게다가, electric field distribution changes with conductor size. 그러므로, engineers must adjust stress control components to maintain uniform field grading.
뿐만 아니라, higher current leads to increased heat generation. 따라서, thermal management becomes more critical for large cross-section cables.
마지막으로, installation becomes more complex as cable size increases. 예를 들어, larger cables require greater bending radius and specialized handling.
Typical Sizes Used in 132kV Systems
실제로, only a limited range of sizes appears frequently. Most utilities prefer standardized options for efficiency and cost control.
Common conductor sizes include:
- 240 mm²
- 300 mm²
- 400 mm²
- 630 mm²
- 800 mm²
- 1000 mm²
Among these, 630 mm² and 800 mm² provide a strong balance between capacity and economic performance. 그러므로, they are widely used in transmission projects.
Installation of 132kV GIS Termination
Proper installation determines long-term reliability. 이러한 이유로, technicians must follow strict procedures at every stage.
첫 번째, they prepare the cable by removing the outer sheath and insulation layers carefully. At this stage, cleanliness is essential.
다음, they install stress control components and insulation parts. Then, they connect the conductor and assemble the termination body.
After that, they mount the termination onto the GIS flange and complete sealing. 마지막으로, engineers perform testing, including partial discharge and high-voltage withstand tests.
Common Challenges and Practical Solutions
Working with GIS terminations presents several challenges. 하지만, proper practices can effectively address them.
Electrical stress concentration may occur if installation lacks precision. 그러므로, technicians must follow design guidelines closely.
Moisture ingress can reduce insulation performance. To prevent this, teams must control humidity during installation.
Gas leakage also poses risks. High-quality sealing systems help avoid this issue.
게다가, mechanical misalignment can cause long-term problems. Accurate positioning ensures stable operation.
Advantages of GIS Cable Termination
GIS terminations offer several advantages in modern power systems. 첫 번째, they support compact designs suitable for urban environments.
게다가, they operate reliably within sealed systems. 결과적으로, they resist environmental factors such as dust and humidity.
게다가, they require less maintenance compared to traditional systems. 그러므로, utilities can reduce operational costs over time.
Applications of 132kV GIS Termination
132kV GIS terminations are widely used across various sectors. 예를 들어, they play a key role in:
- Urban underground substations
- Industrial power distribution systems
- Renewable energy grid connections
- Infrastructure projects such as railways and airports
As infrastructure continues to grow, these applications expand further.
132kV Cable GIS Termination manufacturer
ㅏ 132kV Cable GIS Termination serves as a critical link in high-voltage transmission systems. It connects cables to gas-insulated switchgear while ensuring electrical safety and reliability.
From component design to conductor size selection, every detail affects performance. 그러므로, engineers must evaluate each factor carefully.
As power networks evolve, GIS technology continues to gain importance. 따라서, selecting the right GIS termination solution—and matching it with the appropriate cable size—remains essential for long-term success from 132kV Cable GIS Termination.