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NSGTG-30
NSGTG-30 Solid Insulated Switchgear
The 30kV solid insulated ring main unit is a specialized high-voltage equipment designed for transition scenarios of ultra-high voltage distribution networks, large industrial ultra-high voltage terminals, and overseas distribution networks. It adopts ultra-high voltage gradient insulation epoxy resin integrated casting technology, fully sealed high voltage conductors, vacuum circuit breakers, high-precision transformers and other core components, completely eliminating SF6 gas and insulation oil. The product strictly follows domestic and foreign standards such as GB/T 11022 and IEC 62271-200, and is suitable for ultra-high voltage interconnection power supply, heavy-duty industrial terminal distribution, and 24kV-35kV cross level transition requirements under 30kV voltage level. It has core characteristics such as precise insulation gradient, stable heavy-duty load bearing, and flexible scene adaptation, and is a key equipment to fill the gap in the connection between medium high voltage and ultra-high voltage distribution networks.
Features
1. Precise adaptation of gradient insulation and efficient cross level connection:
Optimized epoxy resin insulation formula and conductor spacing for 30kV transition characteristics, the insulation gradient perfectly matches the 24kV terminal load and 35kV backbone network, without the need to install insulation conversion or voltage regulation equipment, greatly reducing the cost of cross voltage level distribution network transformation.
2. Upgraded heavy-duty performance, outstanding impact resistance:
rated current can reach 1600A-2000A, rated short-circuit breaking current 40kA-50kA, able to stably carry the start stop impact and continuous heavy-duty operation of large industrial ultra-high voltage equipment, temperature rise control strictly follows national standards, suitable for high-end industrial needs such as refining and metallurgy.
3. Dual standard compatibility and universal applicability, suitable for both domestic :
GB standards and overseas 30kV distribution network specifications. It can adapt to 50Hz/60Hz dual frequencies as needed, without requiring significant adjustments to the core structure. It is suitable for upgrading domestic ultra-high voltage distribution networks and also for projects in South America and parts of Africa.
4. Intelligent monitoring for full maintenance, controllable operation and maintenance costs:
equipped with insulation status online monitoring, partial discharge positioning, and contact point temperature rise monitoring modules, compatible with IEC 61850 communication protocol, and can seamlessly integrate into the intelligent distribution network platform; Modular design simplifies the maintenance process and extends the maintenance cycle by 2.5 times compared to traditional equipment of the same level.
5. Full working condition sealing protection, harsh environment tolerance:
Adopting 3.0mm reinforced cold-rolled steel plate with multiple anti-corrosion treatments, the double-layer sealing structure has a protection level of IP65, and can operate stably in extreme temperatures ranging from -45 ℃ to+85 ℃, high salt spray, and high dust environments, suitable for outdoor and industrial harsh working conditions.
Execution standard: GB/T 11022 “Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards” IEC 62271-200、DL/T 1484； Rated parameters: rated current 1600A-2000A, rated short-circuit breaking current 40kA-50kA, rated short-time withstand current 50kA/5s, protection level IP54-IP65, suitable for 50Hz/60Hz dual frequency; Material configuration: Gradient insulation modified epoxy resin (breakdown strength ≥ 32kV/mm), high conductivity copper conductor (silver plated thickened treatment), anti-corrosion reinforced cabinet body; Customized services: Arc light protection, harmonic suppression, AI operation and maintenance warning modules can be installed, supporting protection level and cabinet size upgrades.
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Specification
| Name | Unit | Parameter | |||
| Rated voltage | kV | 30 | |||
| Rated frequency | Hz | 50 | |||
| Current rating | A | 630 | 1250 | ||
| Rated insulation level | Power frequency withstand voltage | Fracture | kV | 80 | |
| Fireline to Fireline | kV | 70 | |||
| Fireline to ground | kV | 70 | |||
| Withstand voltage for lightning impulses | Fracture | kV | 215 | ||
| Fireline to Fireline | kV | 185 | |||
| Fireline to ground | kV | 185 | |||
| Rated short-circuit interrupting current(1s) | kA | 20 | 25 | ||
| Rated short-time withstand current(4s) | kA | 20 | 25 | ||
| Rated peak withstand current(1p) | kA | 50 | 63 | ||
| Rated short-circuit closing current (peak)(1ma) | kA | 50 | 63 | ||
| Enclosure rating | IP4X | ||||
| Operating mode | Spring-loaded energy storage | ||||
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FAQs
Can the 30kV product be directly connected to the 24kV terminal and the 35kV backbone network?
Yes, it is designed specifically for cross level connection. The insulation gradient and conductivity parameters have been accurately matched, and no additional auxiliary equipment is required. It can be directly used as a contact cabinet to achieve smooth power transmission.
Is the anti-corrosion performance reliable when used in high salt spray environments along the coast?
Reliable, with multiple anti-corrosion processes and IP65 sealing protection, it can effectively resist salt spray erosion and the influence of humid environments. The aging rate of insulation components is reduced by 40% compared to ordinary equipment.
Can intelligent monitoring data be integrated with the existing operation and maintenance system of the enterprise?
Supports mainstream communication protocols such as IEC 61850 and Modbus, seamlessly integrates with enterprise private operation and maintenance platforms, and achieves unified data control and fault linkage handling.
What are the core differences compared to products with the same power of 35kV?
The core difference lies in cross level adaptability, with a focus on 24kV-35kV transition scenarios for 30kV, resulting in 18% -25% lower procurement and renovation costs; 35kV focuses on the ultra-high voltage backbone network, with a more extreme carrying capacity.
What is the product warranty policy and service life?
Under normal working conditions, the service life is ≥ 25 years, with a 15 year warranty for insulation components and an 8-year warranty for core electrical components. During the warranty period, free maintenance, debugging, and replacement of original spare parts are provided.
Related Applications
Large scale refining base ultra-high voltage transition distribution:
The ultra-high voltage distribution network connection scenario suitable for large-scale refining and chemical bases generally involves the coexistence of 24kV process equipment and 35kV backbone network, which requires extremely high insulation adaptability and explosion-proof requirements for transition equipment. The gradient insulation design of the 30kV ring main unit can seamlessly connect two types of voltage systems. Its heavy load bearing capacity can stably support the operation of ultra-high voltage equipment such as hydrogenation reactors and large compressors. The explosion-proof module and sealing protection can resist corrosive gases and dust erosion in the refining plant area, avoiding production interruptions caused by power distribution connection failures and ensuring the continuous and safe operation of the refining process.
Distribution network of ultra-high voltage industrial parks in South America:
Applicable to the distribution network of ultra-high voltage industrial parks in some South American countries (such as Colombia and Peru), where the voltage level is 30kV and there are clear requirements for the dual frequency adaptability and weather resistance of the equipment. The dual standard compatibility feature of the product can be directly integrated into the local distribution network system. The 50Hz/60Hz frequency can be switched on demand without additional modification. The extreme temperature resistant design can cope with the tropical high temperature rainstorm and plateau low temperature environment in South America. The modular structure is convenient for the installation and commissioning of local construction personnel, helping the efficient implementation of the ultra-high voltage distribution network project in overseas industrial parks.
Transition project for upgrading domestic ultra-high voltage distribution network:
Adapting to the transition scenario of upgrading the 24kV distribution network to 35kV in domestic cities and industrial areas, the overall renovation cost is high, the cycle is long, and it is easy to affect the existing production and living electricity consumption. The 30kV ring main unit can be used as a core transitional equipment, which can be connected to the 35kV backbone network without replacing the existing 24kV terminal equipment, greatly reducing the cost and duration of upgrading and renovation. The intelligent monitoring function facilitates real-time control of equipment status by operation and maintenance personnel, accurately predicting potential faults, adapting to the operation and maintenance needs during the network upgrade period, and achieving a steady increase in network capacity while balancing power supply stability.
