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China ZBW-12(2HV/LV Prefabricated Substation - Leading Suppliers & Factory for Efficient Power Distribution
General
The prefabricated substation has the characteristic of high integration, compact structure, small footprint safe and reliable operation, convenient maintenance and mobility. Compared with conventional (Civil) substations, the area of prefabricated (box) substations with the same capacity is usually only 1/10-1/5 of that of conventional substations, which greatly reduces the design workload and construction quantities and saves the construction cost. In the distribution system, it can be used in ring network distribution system, dual power supply or radial terminal distribution system. It is a new complete set of equipment for the construction and transformation of urban and rural substations.
ZBW series prefabricated substation meets requirements of IEC62271-202: 2014.
Service Conditions
- a. Ambient temperature: -25 ℃ ~ + 40 ℃; maximum daily temperature difference: < 25 ℃
- b. Altitude: ≤ 1000m
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c. Relative humidity: Daily average relative humidity ≤ 95%Monthly average relative humidity ≤ 90%
- d. Sunlight intensity: 0.1W/cm² (wind speed 0.5m/s);
- e. Outdoor wind speed: ≤ 35m/s;
- f. Pollution grade: Grade III;
- g. Rain proof grade: Grade 3.
- h. The gradient at installation site: ≤ 3°:
- i. Earthquake withstand level: < Grade 8;
- j. Installation site: no fire, explosion danger, serious pollution, chemical corrosion and violent vibration.
※ Note: If the service environment exceeds the above conditions, please confirm with the manufacturer.
Technical Data
| Item | Unit | HV Unit | Transformer Unit | LV Unit | |
| Rated voltage | kV | 12(24) | 10(20) | 0.4 | |
| Rated current | A | 630, 1250 | - | 100–4000 | |
| Rated frequency | Hz | 50/60 | 50/60 | 50/60 | |
| Rated power frequency withstand voltage (1min, r.m.s) | kV | To earth, phase to phase | 42(65) | 35/28(50/40) | 2.0/2.5 |
| Between isolation contacts | 48(79) | ||||
| Rated lightning impulse withstand voltage (peak) | kV | To earth, phase to phase | 75(125) | 75(125) | - |
| Between isolation contacts | 85(145) | ||||
| Rated power | kVA | - | 300–2000 | - | |
| Rated short time withstand current / short circuit duration | kA/s | 20/4 | - | 30/1 | |
| Rated peak withstand current | kA | 50 | - | 63 | |
| Rated short circuit making current (peak) | kA | 50 | - | 15–30 | |
| Fuse breaking current | kA | 31.5 | - | - | |
| Switch breaking current | A | 630, 1250 | - | - | |
| Protection level of enclosure | - | IP33D/IP23D (Transformer enclosure) | |||
| Noise level | dB | Oil transformer ≤ 55, dry transformer ≤ 65 | |||
| Number of circuit | pcs | 1–6 | 2 | 4–30 | |
| Max. reactive compensation capacity | kvar | - | - | 300 | |
Structure
This product is combined with HV unit, transformer unit and LV unit, with three function compartments, that is HV compartment, transformer compartment and LV compartment. The HV/LV compartment has complete functions, and the primary power supply system at HV side can be arranged in various power supply modes, such as ring network power supply, terminal power supply, dual power supply and so on. Also, it can be equipped with HV measuring components to meet requirements of HV measuring, and low loss oil immersed transformer or dry type transformer can be selected; according to the requirements of users, the LV compartment can adopt panel or cabinet type structure to consist power supply scheme required by users, including multiple functions, such as power distribution electric, lighting power distribution, reactive power compensation, energy measurement, electrical measurement, etc. to meet different requirements of users, convenient for power supply management and improve power supply quality.
The HV compartment has compact and optimized structure with comprehensive anti-misoperation interlocking function. When required by users, the transformer can be equipped with rail to facilitate access from the doors on both sides of the transformer compartment. Each compartment has automatic lighting device. In addition, all components selected for HV/LV switchgear have reliable performance and convenient operation, so as that the product can operate safely and reliability and maintain conveniently.
Natural ventilation and forced ventilation can be adopted. Ventilation facilities can be equipped in transformer compartment, HV/LV compartment. Generally, when the temperature reaches the setting value, the ventilation facilities will be opened automatically to ensure the equipment can be operated normally.
The substation structure has reasonable design and elegant appearance, made with high-quality materials, with excellent surface treatment technology, good anti-corrosion, waterproof and dust-proof performance and long service life.
Overall Dimension
Typical layout of 12kV substation
Construction design drawing for foundation and cable incoming & outgoing (for reference)
Typical appearances of Substation
Frequently Asked Questions (FAQ)
What standards does the ZBW series prefabricated substation comply with?
The ZBW series prefabricated substation strictly complies with the international standard IEC62271-202: 2014, ensuring safe, reliable, and standardized operations in urban and rural distribution networks.
What are the main advantages of a prefabricated substation over a civil substation?
Prefabricated substations are highly integrated and compact, typically occupying only 1/10 to 1/5 of the area required by a conventional civil substation of the same capacity. This significantly reduces design workload, construction quantities, and overall project costs.
What are the ambient temperature and altitude limits for installation?
The standard operating conditions require an ambient temperature range of -25 ℃ to +40 ℃ (with a maximum daily temperature difference of < 25 ℃) and an altitude of ≤ 1000m. If your operating environment exceeds these limits, please consult the manufacturer for custom options.
How is ventilation managed in the transformer compartment?
The substation is designed with both natural and forced ventilation systems. Ventilation facilities are equipped in the transformer and HV/LV compartments, and they automatically open when the internal temperature reaches a pre-set value.
What power supply modes can the HV compartment accommodate?
The high-voltage (HV) side primary power supply system is highly flexible and can be arranged in various power supply modes, including ring network power supply, terminal power supply, dual power supply, and radial terminal distribution systems.
What functions can be integrated into the low-voltage (LV) compartment?
Depending on user requirements, the LV compartment can adopt a panel or cabinet structure. It supports multiple functions, including power distribution, lighting power distribution, reactive power compensation, energy measurement, and electrical measurement.