CN210443803U - 220kV HGIS power distribution device applied to single bus sectional wiring of transformer substation - Google Patents
220kV HGIS power distribution device applied to single bus sectional wiring of transformer substation Download PDFInfo
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- CN210443803U CN210443803U CN201920983153.0U CN201920983153U CN210443803U CN 210443803 U CN210443803 U CN 210443803U CN 201920983153 U CN201920983153 U CN 201920983153U CN 210443803 U CN210443803 U CN 210443803U
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Abstract
The utility model relates to a be applied to 220kV HGIS distribution device of single generating line segmentation wiring of transformer substation compares with prior art and has solved the defect that needs the total powerstation to have a power failure during enlargement in the high-voltage distribution wiring of conventional 220kV transformer substation. The bus transfer switch of the utility model is connected between the 1M sectional bus and the 2M sectional bus, the bus transfer switch comprises a 1G isolating switch, a 2G isolating switch and a 3G isolating switch, and the 1G isolating switch, the 2G isolating switch and the 3G isolating switch are connected in series in sequence; an outgoing line L1 is connected in parallel between the 1G isolating switch and the 3G isolating switch, and an outgoing line L2 is connected in parallel between the 1G isolating switch and the 2G isolating switch. The utility model designs a novel HGIS wiring structural style, improved the power supply reliability, reduced extension power off time, reduced electrical equipment simultaneously, practiced thrift engineering cost, easy operation maintenance.
Description
Technical Field
The utility model relates to a transformer substation technical field is a 220kV HGIS distribution device who is applied to single generating line segmentation wiring of transformer substation particularly.
Background
In the prior art, measures of 'vacuumizing a butt-joint air chamber and reducing half pressure of an adjacent air chamber' are generally adopted in the interval expansion process of the GIS and the HGIS to butt joint new equipment, and the total station power failure is required for a transformer substation adopting double-bus wiring. With the development of national economy, the requirements of power users on power supply reliability are higher and higher, and the feasibility of total station power failure is lower and lower.
As shown in fig. 1, in the general design scheme, 2M short-time power failure is required in the hoisting process of the newly-expanded outgoing line interval, and 1M and 2M power failure is required in the leading and connecting process of the bus down lead; in the double-bus common-beam type scheme, 1M and 2M power failure is required in the hoisting process of equipment at the newly-expanded outgoing line interval and the leading and connecting process of a bus down lead.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a need the defect that the total powerstation has a power failure during the enlargement among the conventional 220kV transformer substation high voltage distribution wiring among the solution prior art, provide a 220kV HGIS distribution device who is applied to single generating line segmentation wiring of transformer substation and solve above-mentioned problem.
In order to achieve the above purpose, the technical solution of the present invention is as follows:
the utility model provides a be applied to 220kV HGIS distribution device of single busbar segmentation wiring of transformer substation, includes that busbar shifts switch, play line L1, play line L2, 1M segmentation generating line and 2M segmentation generating line, its characterized in that:
the bus transfer switch is connected between the 1M sectional bus and the 2M sectional bus, the bus transfer switch comprises a 1G isolating switch, a 2G isolating switch and a 3G isolating switch, and the 1G isolating switch, the 2G isolating switch and the 3G isolating switch are sequentially connected in series; an outgoing line L1 is connected in parallel between the 1G isolating switch and the 3G isolating switch, and an outgoing line L2 is connected in parallel between the 1G isolating switch and the 2G isolating switch.
The bus transfer switch controls the outgoing line L1 to be connected with the 1M sectional bus, the outgoing line L1 to be connected with the 2M sectional bus, the outgoing line L2 to be connected with the 1M bus, and the outgoing line L2 to be connected with the 2M bus.
The power distribution device of the transformer substation is HGIS equipment, and a main transformer incoming line is connected to a tubular bus through an incoming line sleeve, a main transformer incoming line breaker, a bus transfer switch and a main transformer outgoing line sleeve on the incoming line side of the HGIS equipment in sequence; the line outlet is connected to the outlet end on the outlet framework through a tubular bus, a bus transfer switch, an outlet breaker and an outlet side outlet sleeve on the outlet side of the HGIS.
The HGIS equipment is a 220kV HGIS power distribution device and is provided with a main transformer incoming line interval, a bus equipment interval, a line outgoing line interval and a subsection interval; the HGIS equipment comprises a circuit breaker CB, a disconnecting switch DS, a maintenance grounding switch ES, a quick grounding switch FES, an electromagnetic current transformer CT and an electromagnetic voltage transformer PT, wherein the circuit breaker CB, the disconnecting switch DS, the maintenance grounding switch ES, the quick grounding switch FES, the electromagnetic current transformer CT and the electromagnetic voltage transformer PT are connected through a conductor medium to form a complete loop.
The main transformer incoming line interval, the bus arrangement interval, the outgoing line interval and the segmentation interval are connected with the 1M segmentation bus or the 2M segmentation bus through the bus transfer switch.
The main transformer inlet wire interval in the inlet wire lead down to the inlet wire sleeve of HGIS equipment inlet wire side, the inlet wire sleeve passes through the conductor medium and links to each other with electromagnetic current transformer CT, electrified display VD, overhaul earthing switch ES and connect in parallel on the conductor medium, electromagnetic current transformer CT links to each other with main transformer inlet wire circuit breaker, main transformer inlet wire circuit breaker links to each other with isolator DS back, through the isolator of 1M side lead up to 1M generating line through main transformer outlet wire sleeve, lead up to 2M generating line through the isolator of 2M side through main transformer outlet wire sleeve.
The #1 bus equipment in the #1 bus equipment interval is connected with an isolating switch DS, and the isolating switch DS is connected in parallel to a conductor medium between a bus transfer switch and a main transformer outgoing bushing on the 1M side and is led up to the 1M bus through the main transformer outgoing bushing; the overhaul grounding switch ES is connected in parallel with the bus equipment side of the isolating switch DS, and the fast grounding switch FES is connected in parallel with the bus side of the isolating switch DS.
The tubular bus in the outgoing line interval is connected to the first outgoing line interval and the second outgoing line interval through a down lead, the first outgoing line interval and the second outgoing line interval are identical in structure, and the first outgoing line interval and the second outgoing line interval are connected with the 1M sectional bus and the 2M sectional bus through the bus transfer switch; the first outgoing line interval comprises an outgoing line sleeve, a bus transfer switch, an outgoing line breaker and an outgoing line side outgoing line sleeve which are positioned on the outgoing line side of the HGIS; the tubular bus in the outgoing interval is connected to the outgoing sleeve through a down lead, the outgoing sleeve is connected with the outgoing circuit breaker through a bus transfer switch, the outgoing circuit breaker is connected with the outgoing sleeve on the outgoing side, and the outgoing sleeve on the outgoing side is led up to be connected to an outgoing end on the outgoing framework.
Advantageous effects
The utility model discloses a be applied to 220kV HGIS distribution device of single generating line segmentation wiring of transformer substation compares with prior art and has designed a neotype HGIS wiring structural style, has improved the power supply reliability, has reduced extension power off time, has reduced electrical equipment simultaneously, has practiced thrift engineering cost, easy operation maintenance.
The utility model discloses compare with the two generating lines schemes of conventionality, the optimal configuration wiring adopts the single generating line segmentation wiring of improved generation, can realize long-term spaced enlargement that does not have a power failure, solves the total powerstation power failure problem that the scheme enlargement of conventional HGIS double-row arrangement exists. The reliability, flexibility and economy are superior to those of double-bus wiring, and an isolating switch at the inlet and outlet side is eliminated. The quantity of the inner sleeves at intervals is reduced by 2 groups in the same ratio, the exposed insulation of the equipment is correspondingly reduced, the reliability of the equipment is correspondingly improved, and the operation and maintenance quantity of the sleeves is reduced.
Simultaneously, still have following advantage:
1. integrating the primary interval equipment and the main transformer at intervals, wherein the primary interval is not provided with a lightning arrester;
2. the vertical and horizontal sizes of the compressed power distribution device area are calculated, so that the occupied area is reduced;
3. the novel power distribution device adapts to the further development of a power grid, fully utilizes limited land resources, reduces the occupied area of a transformer substation, and has remarkable comprehensive benefits.
Drawings
FIG. 1 is a schematic diagram of a HGIS-based dual bus connection in the prior art;
fig. 2 is a schematic view of the single bus bar segment wiring structure of the present invention;
FIG. 3 is a wiring diagram of the HGIS power distribution device of the 220kV transformer substation of the present invention;
FIG. 4 is a plan view of a HGIS power distribution device of a 220kV transformer substation of the present invention;
FIG. 5 is a sectional view of the main transformer- #1 bus arrangement of the HGIS power distribution device #1 of FIG. 4;
FIG. 6 is a sectional view of the HGIS power distribution device of FIG. 4 with a reserved line-outgoing line 1 interval;
FIG. 7 is a diagram showing the separation of the air chambers at the extension joint of the outgoing line and outgoing line equipment units of the present invention;
the system comprises a 1-main transformer incoming interval incoming line, a 2-incoming sleeve, a 3-variable incoming circuit breaker, a 4-bus transfer switch, a 5-main transformer outgoing sleeve, a 6-tubular bus, a 7-outgoing sleeve, an 8-outgoing circuit breaker, a 9-outgoing side outgoing sleeve, a down lead from a 10-1M bus to a 1M bus sleeve, and a down lead from a 11-2M bus to a 2M bus sleeve.
Detailed Description
In order to further understand and appreciate the structural features and advantages of the present invention, preferred embodiments and the accompanying drawings are described in detail as follows:
as shown in fig. 2, the bus transfer switch of the present invention is connected between the 1M sectional bus and the 2M sectional bus, the bus transfer switch includes a 1G isolating switch, a 2G isolating switch and a 3G isolating switch, and the 1G isolating switch, the 2G isolating switch and the 3G isolating switch are connected in series in sequence; an outgoing line L1 is connected in parallel between the 1G isolating switch and the 3G isolating switch, and an outgoing line L2 is connected in parallel between the 1G isolating switch and the 2G isolating switch.
The bus transfer switch controls the outgoing line L1 to be connected with the 1M sectional bus, the outgoing line L1 to be connected with the 2M sectional bus, the outgoing line L2 to be connected with the 1M bus, and the outgoing line L2 to be connected with the 2M bus.
The HGIS equipment refers to a combined electrical appliance which places a circuit breaker CB, a disconnecting switch DS, an overhaul grounding switch ES, a quick grounding switch FES, an electromagnetic current transformer CT and an electromagnetic voltage transformer PT in a metal shell, uses SF6 (sulfur hexafluoride) gas as an insulating medium, uses air as an insulating medium for a three-phase ABC bus, and is connected with the three-phase bus through a lead.
As shown in fig. 3 and 4, a novel 220kV HGIS power distribution device with an improved single bus sectionalized wiring includes a main transformer incoming line interval, a bus equipment interval, a line outgoing line interval, and a sectionalized interval; electric energy flows to the bus bar from the outgoing line interval and then is distributed to the main transformer incoming line interval through the bus bar. The two outgoing lines at the corresponding positions of the same interval are connected with the 1M sectional bus or the 2M sectional bus through the bus transfer switch, so that the uniform distribution of the load and the power supply and the bus switching under the bus maintenance state are realized.
Compared to the conventional generic design 220-B-2 scheme. The 220kV power distribution device adopts the double-row arrangement of circuit breakers, the 220kV outgoing line interval adopts a double-layer outgoing line scheme, and 2 outgoing line intervals are subjected to module combination to form a modular arrangement mode that 2 loops are combined in one interval width. And the main transformer interval and the mother interval are integrated and arranged at the same interval, so that the number of transverse intervals is reduced. And the space width was optimized to 12 meters as shown in table 1.
TABLE 1220 kV HGIS distribution device size
As shown in fig. 5, the HGIS power distribution apparatus has the following mounting structure in the interval between #1 main transformer- #1 bus, i.e., the incoming line side, as the HGIS power distribution apparatus:
leading down to the inlet wire sleeve 2 of HGIS equipment inlet wire side through inlet wire 1 wire in the main transformer inlet wire interval, inlet wire sleeve 2 links to each other with electromagnetic type current transformer CT through the conductor medium, electrified display VD, overhaul earthing switch ES connect in parallel on the conductor medium, electromagnetic type current transformer CT links to each other with main transformer inlet wire circuit breaker 3, main transformer inlet wire circuit breaker 3 links to each other with isolator DS back, through the isolator of 1M side through main transformer outlet wire sleeve 5 draw-up to 1M generating line, through the isolator of 2M side through main transformer outlet wire sleeve 5 draw-up to 2M generating line. The #1 bus equipment in the #1 bus equipment interval is connected with an isolating switch DS, and the isolating switch DS is connected in parallel to a conductor medium between a bus transfer switch and a main transformer outgoing line sleeve 5 on the 1M side and is led to a 1M bus through the main transformer outgoing line sleeve 5; the overhaul grounding switch ES is connected in parallel with the bus equipment side of the isolating switch DS, and the fast grounding switch FES is connected in parallel with the bus side of the isolating switch DS. The interval equipment and the main transformer are integrated at intervals, and the arrester can not be arranged at the interval.
As shown in fig. 6, as the reserved outgoing line-outgoing line 1 interval of the HGIS power distribution device, i.e. the outgoing line side, the mounting structure of the HGIS power distribution device is as follows:
the tubular bus 6 in the outgoing line interval is connected to the first outgoing line interval and the second outgoing line interval through a down lead, the first outgoing line interval and the second outgoing line interval are identical in structure, and the first outgoing line interval and the second outgoing line interval are connected with the 1M sectional bus and the 2M sectional bus through the bus transfer switch 4; the first outgoing line interval comprises an outgoing line sleeve 7 at the HGIS side, a bus transfer switch 4, an outgoing line breaker 8 and an outgoing line sleeve 9 at the outgoing line side; the tubular bus 6 in the outgoing interval is connected to the outgoing line sleeve 7 through a down lead, the outgoing line sleeve 7 is connected with the outgoing line breaker 8 through the bus transfer switch 4, the outgoing line breaker 8 is connected with the outgoing line side outgoing line sleeve 9, and the outgoing line side outgoing line sleeve 9 is led up to be connected to an outgoing line end on the outgoing line framework.
In the actual operation of the transformer substation, the main functions of the isolating switches on the two sides of the main transformer/line breaker are only reflected in the process of overhauling the breaker, the current transformer, the line and the like, so that an obvious disconnection point is ensured between the overhauling equipment and the live equipment, and the requirements of field work safety measures are met. In AIS (air insulation) equipment, as long as the circuit breaker withdraws from, both ends isolator is opened, and earthing switch ground connection, the circuit breaker just can overhaul, even when HGIS equipment circuit breaker both ends isolator all opened, also can not the on-the-spot disintegration maintenance to can't provide effectual electrical isolation for circuit breaker, mutual-inductor maintenance. Because the fault rate of the HGIS equipment is low, the HGIS equipment belongs to a high-reliability or even maintenance-free product, a circuit or a main transformer side isolating switch is cancelled, the number of elements in the combined electrical apparatus is reduced, and the overall reliability is further improved.
The conventional double-bus wiring scheme is characterized in that two sets of sleeves are arranged at a wire outlet end, two sides of a tubular double-bus are respectively provided with two sets of sleeves to be connected to corresponding intervals at two sides, for example, a main transformer interval adopts two sets of wiring to be connected to a bus I and a bus II, and a set of wiring is connected to a main transformer. Two groups of connection wires are connected to the bus I and the bus II at intervals of the line, and one group of connection wires are connected to the line outlet end, so that 6 groups of pipelines are required. This scheme adopts peculiar wiring pattern, and generating line to leading-out terminal sets up two sets of sleeve pipes, and the generating line sets up respectively to the distribution device of both sides and sets up 1 group's sleeve pipe, needs 4 groups of sleeve pipes altogether. The same interval saves 2 groups of outgoing line sleeves compared with the conventional scheme. The engineering economy is significantly increased.
As shown in fig. 4, 5 and 6, the longitudinal dimension is optimized by calculating the compressed busbar phase spacing and the busbar spacing. The longitudinal dimension of the 220kV power distribution device is compressed to 39.75 meters, and compared with the longitudinal dimension of a module of the 220kV power distribution device in a conventional general design scheme, the longitudinal dimension of the module is 55.5 meters, and the compression dimension of the module is 15.75 meters. By compressing the lateral and longitudinal dimensions of the 220kV switchgear area, the switchgear saves 27.7% of the floor space compared to conventional common design solutions of the same scale.
The HGIS equipment usually has the condition of staging construction, and the uninterrupted extension of the HGIS equipment is realized by reasonably reserving a transition air chamber:
as shown in fig. 7, when the extension outlet 2 is in use, only 1M short time of power failure is needed for maintenance, and the bus transfer switch is turned on, so that the extension equipment can be hoisted in place.
In the splicing process of the domestic GIS/HGIS equipment, measures of 'vacuumizing a butt joint air chamber and reducing half pressure of an adjacent air chamber' are generally adopted, and in order to avoid the influence of power failure caused by the extension outgoing line 1 in the later period, the design is reserved according to an air chamber partition diagram shown in figure 7. And the 1G and 3G isolating switches are opened, so that the uninterrupted operation of the outgoing line 1 in the splicing process of the equipment can be realized.
During the withstand voltage test process, the single fracture (open 1G promptly, 3G isolator) can not guarantee withstand voltage test time safety (keep apart fracture both sides and have the stack of both sides voltage), consequently, need during withstand voltage test to demolish 1M generating line to 1M generating line sheathed tube downlead 10 for a short time (1M power failure for a short time this moment), 1 interval of going out the line accompanies and stops to open 3G and 2G isolator (being double fracture this moment), need not demolish 2M generating line to 2M generating line sheathed tube downlead 11, other intervals of going out the line all normally supply power. After the withstand voltage test is completed, the power supply of the line 1 can be recovered, after the 1M bus is remounted to the down lead 11 of the 1M bus sleeve, the 1M bus can recover the power supply, and the out lead 2 can also supply power.
In conclusion, the incomplete outgoing line-outgoing line equipment unit extension process is as follows: the method comprises the steps of firstly, cutting off the 1M power, disconnecting the 1M bus to the down lead 11 of the 1M bus sleeve, after the equipment is installed in place (in the process, the bus transfer switch 3G is turned on, the outgoing line 1 runs in a single bus mode), cutting off the outgoing line 1, recovering the power supply of the outgoing lines 1 and 2M bus after the withstand voltage test is finished, and completing the power supply operation of the outgoing line 2.
In a conventional general design scheme, 2M short-time power failure is needed in the hoisting process of a new extension outgoing line interval, and 1M and 2M power failure is needed in the leading and connecting process of a bus down lead at the same time; in the double-bus common-beam type scheme, 1M and 2M power cut is needed in the hoisting process of equipment at the newly expanded outgoing line interval and the leading process of a bus down lead, so that the power cut range is relatively small in the expansion of the optimization scheme.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a be applied to 220kV HGIS distribution device of single busbar segmentation wiring of transformer substation, includes that busbar shifts switch, play line L1, play line L2, 1M segmentation generating line and 2M segmentation generating line, its characterized in that:
the bus transfer switch is connected between the 1M sectional bus and the 2M sectional bus, the bus transfer switch comprises a 1G isolating switch, a 2G isolating switch and a 3G isolating switch, and the 1G isolating switch, the 2G isolating switch and the 3G isolating switch are sequentially connected in series; an outgoing line L1 is connected in parallel between the 1G isolating switch and the 3G isolating switch, and an outgoing line L2 is connected in parallel between the 1G isolating switch and the 2G isolating switch.
2. The 220kV HGIS power distribution device applied to the single-bus section wiring of the substation according to claim 1, wherein: the bus transfer switch controls the outgoing line L1 to be connected with the 1M sectional bus, the outgoing line L1 to be connected with the 2M sectional bus, the outgoing line L2 to be connected with the 1M bus, and the outgoing line L2 to be connected with the 2M bus.
3. The 220kV HGIS power distribution device applied to the single-bus section wiring of the substation according to claim 1, wherein: a main transformer incoming line is connected to a tubular bus (6) through an incoming line sleeve (2), a main transformer incoming line breaker (3), a bus transfer switch (4) and a main transformer outgoing line sleeve (5) on the incoming line side of the HGIS equipment in sequence; the line outlet is connected to the outlet end on the outlet framework through a tubular bus (6) through an outlet sleeve (7) on the outlet side of the HGIS, a bus transfer switch (4), an outlet breaker (8) and an outlet side outlet sleeve (9).
4. The 220kV HGIS power distribution device applied to the single-bus section wiring of the substation according to claim 3, wherein: the system also comprises a main transformer incoming line interval, a bus equipment interval, a line outgoing line interval and a subsection interval; the HGIS equipment comprises a circuit breaker CB, a disconnecting switch DS, a maintenance grounding switch ES, a quick grounding switch FES, an electromagnetic current transformer CT and an electromagnetic voltage transformer PT, wherein the circuit breaker CB, the disconnecting switch DS, the maintenance grounding switch ES, the quick grounding switch FES, the electromagnetic current transformer CT and the electromagnetic voltage transformer PT are connected through a conductor medium to form a complete loop.
5. The 220kV HGIS power distribution device applied to the single-bus section wiring of the substation according to claim 4, wherein: the main transformer incoming line interval, the bus arrangement interval, the outgoing line interval and the segmentation interval are connected with the 1M segmentation bus or the 2M segmentation bus through the bus transfer switch.
6. The 220kV HGIS power distribution device applied to the single-bus section wiring of the substation according to claim 3, wherein: the main transformer inlet wire interval middle inlet wire (1) lead is led down to an inlet wire sleeve (2) on the HGIS equipment inlet wire side, the inlet wire sleeve (2) is connected with an electromagnetic current transformer CT through a conductor medium, an electrified display VD and an overhaul grounding switch ES are connected in parallel on the conductor medium, the electromagnetic current transformer CT is connected with a main transformer inlet wire circuit breaker (3), after the main transformer inlet wire circuit breaker (3) is connected with a disconnecting switch DS, the main transformer inlet wire circuit breaker is led up to a 1M bus through a disconnecting switch on the 1M side through a main transformer outlet wire sleeve (5), and the main transformer outlet wire sleeve (5) is led up to a 2M bus through a disconnecting switch on the 2M side.
7. The 220kV HGIS power distribution device applied to the single-bus section wiring of the substation according to claim 6, wherein: in the #1 bus equipment interval, #1 bus equipment is connected with an isolating switch DS, and the isolating switch DS is connected in parallel to a conductor medium between a bus transfer switch and a main transformer outgoing line sleeve (5) on the 1M side and is led to the 1M bus through the main transformer outgoing line sleeve (5); the overhaul grounding switch ES is connected in parallel with the bus equipment side of the isolating switch DS, and the fast grounding switch FES is connected in parallel with the bus side of the isolating switch DS.
8. The 220kV HGIS power distribution device applied to the single-bus section wiring of the substation according to claim 3, wherein: the outgoing line interval middle tubular bus (6) is connected to the first outgoing line interval and the second outgoing line interval through a down lead, the first outgoing line interval and the second outgoing line interval are identical in structure, and the first outgoing line interval and the second outgoing line interval are connected with the 1M sectional bus and the 2M sectional bus through the bus transfer switch (4); the first outgoing line interval comprises an outgoing line sleeve (7) positioned on the outgoing line side of the HGIS, a bus transfer switch (4), an outgoing line breaker (8) and an outgoing line side outgoing line sleeve (9); the outgoing line interval middle tubular bus (6) is connected to an outgoing line sleeve (7) through an outgoing line, the outgoing line sleeve (7) is connected with an outgoing line breaker (8) through a bus transfer switch (4), the outgoing line breaker (8) is connected with an outgoing line side outgoing line sleeve (9), and the outgoing line side outgoing line sleeve (9) is led up to be connected to an outgoing line end on the outgoing line framework.
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| CN201920983153.0U CN210443803U (en) | 2019-06-27 | 2019-06-27 | 220kV HGIS power distribution device applied to single bus sectional wiring of transformer substation |
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| CN201920983153.0U CN210443803U (en) | 2019-06-27 | 2019-06-27 | 220kV HGIS power distribution device applied to single bus sectional wiring of transformer substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165563A (en) * | 2019-06-27 | 2019-08-23 | 安徽华电工程咨询设计有限公司 | A kind of 220kV HGIS power distribution equipment applied to substation's single-trunk segmental wiring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165563A (en) * | 2019-06-27 | 2019-08-23 | 安徽华电工程咨询设计有限公司 | A kind of 220kV HGIS power distribution equipment applied to substation's single-trunk segmental wiring |
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