YBW-12 Prefabricated Box-type Substation (European)

Applications

Widely used indoors and outdoors in urban grid renovation, residential quarters, high-rise buildings, industrial & mining sites, hotels, shopping malls, airports, railways, oil fields, docks, expressways and temporary power facilities. The YBW-12 prefabricated box-type substation adopts a trinity structure of HV switchgear, transformer and LV switchgear, with a rated voltage of 12 kV.

Type Designation

Features & Advantages

• HV switchgear, transformer and LV switchgear in one body, highly complete;
• Complete HV and LV protection, safe and reliable operation, simple maintenance;
• Small footprint, low investment, short production cycle, easy to move;
• Flexible and diverse connection schemes;
• Unique structure: unique honeycomb double-layer (composite panel) enclosure, firm, heat-insulating, ventilating and beautiful, with high protection class; enclosure materials available: stainless steel titanium alloy, aluminum alloy, cold-rolled plate, color steel plate;
• Various types: general type, villa type, compact type and other styles;
• The HV ring main unit can be equipped with a distribution automation terminal (FTU) for reliable detection of short-circuit and single-phase-to-earth faults, with "four-remote" functions, facilitating distribution automation upgrades.

Service Conditions

• Altitude: ≤1000 m;
• Ambient temperature: -25℃ to +40℃;
• Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%;
• The installation site shall be free from violent impact, serious pollution, chemical corrosion, conductive dust and explosion hazards; if the normal service conditions cannot be met, please consult our company for a solution.

Transformer

The intelligent integrated substation selects low-loss, oil-immersed, fully sealed S9, S10 and S11 series transformers; resin-insulated or NOMEX paper-insulated environment-friendly dry-type transformers are also available, and the transformer can be easily moved in and out. The YBW-12 prefabricated box-type substation is equipped with a load switch of rated current 630 A and rated frequency 50 Hz.

HV Side

The HV side of the intelligent integrated substation is generally protected by a load switch-fuse combination; after one fuse blows, the three phases trip jointly. Load switches available: gas-pressure type, vacuum type, SF6 type etc.; a motorized operating mechanism can be provided for automation upgrades. The fuse is a high-voltage current-limiting fuse with striker, reliable in action and with large breaking capacity. For transformers above 800 kVA, vacuum circuit breakers such as ZN12, ZN28 and VS1 can be selected for protection. The YBW-12 prefabricated box-type substation provides primary schemes No. 01 to 12, with cabinet types including HXGN-12 and XGN66-12.

LV Side

The LV main switch adopts an air (universal) or intelligent circuit breaker with selective protection; the outgoing switches adopt new molded-case switches with small volume, short arcing and flexible outgoing; an intelligent auto-tracking reactive power compensation device offers two switching modes, contactor type and contactless type, for users to choose.

Applicable Standards

GB/T 17467-1998 "High-voltage/low-voltage prefabricated substations"

DL/T 537-93 "Ordering technical conditions for 6-35 kV box-type substations"

Technical Parameters

Load switch technical parameters

HV fuse technical parameters

Note: (80) denotes the high breaking-capacity version.

Primary Scheme Diagrams

For the primary schemes of the substation, see the attached drawings.

Typical Scheme Examples

For typical scheme examples, see the attached drawings.

Foundation & Layout Drawings

For the foundation drawing and layout drawing of the substation, see the attached drawings; users may select as required.

Installation, Use & Maintenance

For installation, acceptance, handover tests, operation and maintenance of the intelligent integrated substation, in addition to the regulations required by the power department, note the following:

• Upon receipt, users shall inspect carefully according to relevant regulations; products not to be installed immediately shall be stored in suitable places as specified by the normal service conditions.
• The product shall be lifted from the bottom with special tools, as shown in the right figure.
• Place the product horizontally on the pre-made foundation, then seal the gap between the base and the foundation with cement mortar to prevent rainwater from entering the cable room; connect the HV and LV cables through the bottom sealing plates of the HV and LV rooms.
• After installation, reliable earthing shall be done; the two main earthing terminals on the channel steel of the substation base, the transformer neutral point and enclosure, the lower terminals of the surge arrester, etc. shall be earthed separately by the installation department. All earthing shall share one set of earthing devices with an earthing resistance less than 4 ohms, and at least two earthing leads shall be drawn from the earthing grid to the product.

After installation or maintenance, the following inspections and tests shall be carried out before commissioning:

• Whether the substation interior is clean;
• Whether the operating mechanisms are flexible;
• Whether the switching of main apparatus is flexible and reliable;
• Whether the switching of auxiliary contacts of apparatus is reliable and accurate;
• Whether meters and relays act accurately without error;
• Whether the ratios and wiring polarities of meters and instrument transformers are correct;
• Whether all apparatus mounting nuts are tightened and the mounting is firm and reliable;
• Whether the busbar connections are good and their supporting insulators and clamps are reliably installed;
• Whether the setting values of apparatus meet requirements and the fuse-link specifications are correct;
• Whether the connections of the main and auxiliary circuits meet the electrical schematic requirements.

Maintenance

• All components in the product shall be maintained according to their own technical requirements;
• If an oil-immersed transformer is selected, an oil sample analysis shall be performed at least once a year as required;
• For HV switchgear in operation, after 20 loaded or 2000 no-load switching operations, the contact condition and the wear of the arc-extinguishing device shall be checked; any abnormality shall be repaired or replaced in time.
• After the LV switchgear trips automatically, the tripping cause shall be checked and analyzed; it can be re-commissioned only after the fault is eliminated;
• The surge arrester shall undergo a preventive test once a year before the thunderstorm season.

Note: The product is provided with a packing list, certificate, installation and operation manual, electrical wiring diagram, manuals of the main components used, key operating tools, and spare parts provided per the agreement.

Technical Scheme Illustrations

-	Scheme No.	01	02	03
-	Main-circuit single-line diagram
	Application	Terminal type: cable incoming / one outgoing	Terminal type: reversed incoming	Terminal type: overhead incoming
Cabinet type	HXGN-12	HXGN-12	HXGN-12
Primary equipment selection	Vacuum circuit breaker ZN28, VS1	-	-	-
	Load switch FN, FZN, FLN	1	1	1
	Disconnector GN	-	-	-
	Fuse XRNT	3	3	3
	Fuse RN2	-	-	-
	Surge arrester HY5W	3	3	3
	Live-line indicator GSN	1	1	1
	Current transformer LZZBJ	-	-	-
	Voltage transformer JDZ	-	-	-

-	Scheme No.	04	05	06
-	Main-circuit single-line diagram
	Application	Terminal type: vacuum circuit-breaker incoming	Terminal type: incoming with metering / one outgoing	Terminal type: cable incoming / one outgoing with metering
Cabinet type	XGN66-12	HXGN-12	HXGN-12
Primary equipment selection	Vacuum circuit breaker ZN28, VS1	1	-	-
	Load switch FN, FZN, FLN	-	1	1
	Disconnector GN	2	-	-
	Fuse XRNT	-	3	3
	Fuse RN2	-	3	3
	Surge arrester HY5W	3	3	3
	Live-line indicator GSN	1	1	1
	Current transformer LZZBJ	2	2	2
	Voltage transformer JDZ	-	2	2

Scheme No.07、08、09

-	Scheme No.	07	08	09
-	Main-circuit single-line diagram
	-	Application	Terminal type: incoming with metering, PT & one outgoing	Terminal type: one incoming with metering / one outgoing	Terminal type: circuit-breaker incoming / metering
-	Cabinet type	HXGN-12	HXGN-12	XGN66-12
-	Vacuum circuit breaker ZN28, VS1	-	-	1
-	Load switch FN, FZN, FLN	1	2	-
-	Disconnector GN	1	-	2
-	Fuse XRNT	3	3	3
-	Fuse RN2	3	3	3
-	Surge arrester HY5W	3	3	3
-	Live-line indicator GSN	1	1	1
-	Current transformer LZZBJ	2	2	4
-	Voltage transformer JDZ	2	2	2

Scheme No.10、11、12

-	Scheme No.	10	11	12
-	Main-circuit single-line diagram
	-	Application	Terminal type: circuit-breaker incoming / PT & one outgoing	Terminal type: one incoming / two outgoing	Terminal type: incoming with metering / two outgoing
-	Cabinet type	XGN66-12 HXGN-12	HXGN-12	HXGN-12
-	Vacuum circuit breaker ZN28, VS1	1	-	-
-	Load switch FN, FZN, FLN	1	3	2
-	Disconnector GN	3	1	-
-	Fuse XRNT	3	6	6
-	Fuse RN2	3	-	3
-	Surge arrester HY5W	3	3	3
-	Live-line indicator GSN	1	1	1
-	Current transformer LZZBJ	2	2	2
-	Voltage transformer JDZ	2	-	2

Substation Main Structure Diagram

Ordering Information

The following information shall be provided when ordering:

• Substation model and quantity;
• Transformer model and quantity;
• HV and LV primary connection schemes and the models & parameters of main components;
• Enclosure material and color.

Related Products

Box-type substations of the same series and other types available:

• YBD-12 Underground Prefabricated Substation
• YB-40.5 Wind Power Box-type Substation
• ZGS-12 Combined Substation (American)