Overview
Widely used in urban power grid renovation, residential communities, high-rise buildings, industrial and mining enterprises, hotels, shopping malls, airports, railways, oilfields, wharves, expressways, and temporary power facilities, both indoors and outdoors.
Functions and Features
1. High-voltage switchgear, transformer, and low-voltage switchgear are integrated into one unit, offering high completeness;
2. High and low voltage protection is comprehensive, ensuring safe and reliable operation and simple maintenance;
3. Small footprint, low investment, short production cycle, and easy to move;
4. Flexible and diverse wiring schemes;
5. Unique structure: The unique honeycomb-structured double-layer (composite panel) enclosure is sturdy, with heat insulation and dual heat dissipation ventilation, aesthetically pleasing, and a high protection rating. Enclosure materials are available in stainless steel alloy, aluminum alloy, cold-rolled sheet, and color steel sheet;
6. Diverse types: General type, villa type, compact type, and other styles;
7. The high-voltage ring main unit can be equipped with a Feeder Terminal Unit (FTU) to achieve reliable detection of short-circuit and single-phase grounding faults, with "four-remote" functions, facilitating distribution network automation upgrades.
Operating Conditions
1. Altitude not exceeding 1000 m;
2. Ambient temperature: -25℃ to +40℃;
3. Relative humidity: Daily average not exceeding 95%, monthly average not exceeding 90%;
4. Installation site: Locations free from fire, explosion hazards, conductive dust, chemically corrosive gases, and severe vibration. If conditions exceed the above, users may consult with our company.
Low-Voltage Side
The main switch on the low-voltage side adopts a universal or intelligent circuit breaker with selective protection; outgoing switches use new molded-case switches that are small in size and have short arc chutes, with up to 30 circuits; the intelligent automatic tracking reactive power compensation device offers two control modes—contactor and contactless—for users to choose from.
High-Voltage Side
The high-voltage side of the intelligent integrated substation generally adopts load switch-fuse combination apparatus protection. When one phase of the fuse blows, all three phases trip in linkage. Load switches are available in compressed air, vacuum, and sulfur hexafluoride types, and can be equipped with electric operating mechanisms for automation upgrades; the fuses are high-voltage current-limiting fuses with strikers, featuring reliable operation and high breaking capacity. See the table below for main technical parameters. For transformers above 800 kVA, vacuum circuit breakers such as ZN12, ZN28, and VS1 can be selected for protection.
Transformer
The intelligent integrated substation adopts low-loss, oil-immersed, fully sealed S9, S10, and S11 series transformers, or alternatively resin-insulated or NOMEX paper-insulated environmentally friendly dry-type transformers. A trolley can be provided at the bottom for convenient transformer access.
Applicable Standards
This product complies with the following standards:
GB/T17467-1998 "High-Voltage/Low-Voltage Prefabricated Substations"
DL/T537-93 "Technical Conditions for Ordering 6～35kV Box-Type Substations"
Load Switch Technical Parameters
| No. | Name | Unit | FN12-12 Load Switch | FZM12-12 Vacuum Load Switch |
| 1 | Rated voltage | kV | 10 | |
| 2 | Maximum operating voltage | kV | 12 | |
| 3 | Rated frequency | Hz | 50 | |
| 4 | Rated current | 630 | ||
| 5 | Rated breaking load current | A | 630 | |
| 6 | Thermal stability current (RMS) | kA/S | 20/2 | 20/4 |
| 7 | Dynamic stability current | kA | 50 | 50 |
| 8 | Short-circuit making current (peak) | kA | 50 | 50 |
| 9 | Number of load breaking operations | times | 20 | 10000 |
| 10 | Mechanical life | times | 2000 | 10000 |
| 11 | 1 min power frequency withstand voltage (phase-to-phase and to ground) | kV | 42 | 42 |
| 12 | Lightning impulse voltage (phase-to-phase and to ground) | kV | 75 | 75 |
High-Voltage Fuse Technical Parameters
| No. | Model | Rated voltage (KV) | Breaking current (A) | Breaking current (KA) | Fuse element rated current (A) | |
| UK model | Domestic model | |||||
| SDL series | XRNT-12 | 12 | 40 | 31.5 | 6.3, 10, 16, 20, 25, 31.5, 40 | |
| SFL series | 12 | 100 | 31.5 | 50, 63, 71, 80, 100 | ||
| SKL series | 12 | 125 | 31.5 | 125 | ||
Note: Determined by whether a striker is installed; N means no striker, A means with striker.
| No. | Tripping device type | Tripping device rated current A | Making and breaking capacity kA (AC380V) |
| DW15-630 | Thermal-electromagnetic or electronic type | 315, 400, 630 | 40 |
| DW15-1000 | 630, 800, 1000 | 50 | |
| DW15-1600 | 1600 | 50 | |
| DW15-2500 | 1600, 2000, 2500 | 60 | |
| CW1-2000 | Intelligent type | 630, 800, 1000, 1250, 1600, 2000 | 65(80) |
| CW1-3200 | 2000, 2500, 3200 | 100 |
Note: (80) indicates the high breaking capacity type.
Installation, Operation and Maintenance
In addition to the various regulations required by the power department regarding installation, acceptance, handover testing, operation, and maintenance of the intelligent integrated substation, attention should be paid to the following:
◆ Upon receipt, users should carefully inspect according to relevant regulations. For products not to be installed immediately, they should be stored in an appropriate location in accordance with normal operating conditions.
◆ The product should be lifted from the bottom using dedicated lifting equipment, as shown in Figure 3.
◆ Place the product horizontally on a pre-built foundation, then seal the gap between the product base and the foundation with cement mortar to prevent rainwater from entering the cable compartment. Connect high and low voltage cables through the bottom sealing plates of the high and low voltage compartments.
◆ After the product is installed in place, reliable grounding should be ensured: the two main grounding terminals on the channel steel of the substation base, the transformer neutral point and enclosure, and the lower terminals of the surge arresters should each be grounded by the installation department. All grounding should share a common grounding device with a grounding resistance of less than 4 ohms;
◆ After installation or maintenance is completed, the following inspections and tests should be conducted before commissioning:
◇ Whether the substation interior is clean;
◇ Whether the operating mechanisms are flexible;
◇ Whether the main electrical apparatus switching is flexible and reliable;
◇ Whether the auxiliary contacts of electrical apparatus switch reliably and accurately;
◇ Whether meters and relays operate accurately;
◇ Whether the transformation ratios and wiring polarity of instruments and transformers are correct;
◇ Whether all electrical installation nuts are tightened and the installation is firm and reliable;
◇ Whether busbar connections are good and their supporting insulators and clamps are reliably installed;
◇ Whether the setting values of electrical apparatus meet requirements and the fuse element specifications are correct;
◇ Whether the contacts of the main circuit and auxiliary circuit meet the requirements of the electrical schematic diagram.
◆ Maintenance
◇ All components in the product shall be maintained according to their respective technical requirements;
◇ If the selected transformer is oil-immersed, an oil sample analysis inspection shall be conducted at least once a year as required;
◇ After 20 on-load or 2000 no-load opening/closing operations, the high-voltage switchgear in operation shall be inspected for contact conditions and arc extinguishing device wear. If abnormalities are found, timely repair or replacement shall be carried out;
◇ After the low-voltage switchgear trips automatically, the cause of tripping shall be examined and analyzed. Re-commissioning is only permitted after the fault is eliminated;
◇ Surge arresters shall undergo a preventive test once a year before the thunderstorm season arrives;
◇ The product is accompanied by a packing list, certificate of conformity, installation and operation manual, electrical wiring diagram, and manuals for the main component equipment used in this product, including operating tools and spare parts provided according to the agreement.
