CN218071014U - Alternate arrangement structure for connecting homonymous loops to buses on different sides - Google Patents

Abstract

The utility model discloses a homonymy loop access different side bus alternate arrangement structure, which comprises a bus I and a bus II, wherein a first 3/2 circuit breaker wiring unit and a second 3/2 circuit breaker wiring unit are connected between the bus I and the bus II, a first sleeve is arranged between a first incoming line side circuit breaker and a first middle circuit breaker, and a second sleeve is arranged between the first middle circuit breaker and the first outgoing line side circuit breaker; the first sleeve extends to a position between the first middle breaker and the first breaker close to the outlet side, and the wiring terminal in the first sleeve is connected with the first outlet through a wire; the second sleeve extends to first middle circuit breaker with first being close to between the inlet wire side circuit breaker, binding post passes through the wire with 2# generating set output in the second sleeve and is connected.

Description

Alternate arrangement structure for connecting homonymous loops to buses on different sides

The technical field is as follows:

the utility model belongs to the technical field of high voltage substation design and construction, especially, relate to a homonymy return circuit inserts different side generating lines and arranges structure in turn.

Background art:

in the initial stage of power plant construction, when the power distribution device has only two strings, the circuits with the same name are respectively and alternatively connected with the buses on different sides, namely, the circuits are arranged alternately. The arrangement can avoid the problem that when a middle circuit breaker of one string is overhauled, the circuit breakers on the bus sides of the same-name circuit strings are combined, and the same-name circuits configured on the buses on the same side are simultaneously disconnected to cause power failure of the whole plant (station). The configuration mode that the homonymous loops are alternately connected with the buses on different sides usually has the problem that one string needs to occupy two intervals, the complexity of the structure and the lead is increased, and the occupied area is enlarged.

As shown in fig. 1, if the wiring pattern does not take the form of an "alternate arrangement". The QF2 circuit breaker (the intermediate circuit breaker in the #1 string) is overhauled, and if at this time the QF6 circuit breaker fails, in order to cut the failed circuit breaker, it is necessary to disconnect the adjacent QF3 circuit breaker and QF5 circuit breaker. At the moment, the QF2 circuit breaker, the QF3 circuit breaker and the QF5 circuit breaker are all disconnected, and no conducting loop exists inside and outside the power plant, so that the power failure condition of the whole plant can be caused.

As shown in fig. 2, if the wiring pattern is "alternate". The QF2 circuit breaker (the intermediate circuit breaker in the string # 1) overhauls, and if at this time the QF6 circuit breaker fails, in order to cut off the failed circuit breaker, it is necessary to disconnect the adjacent QF3 circuit breaker and QF5 circuit breaker. At the moment, the QF2 circuit breaker, the QF3 circuit breaker and the QF5 circuit breaker are all disconnected, but the #1 unit can send out electricity through a path of a QF1-I bus-QF 4-500kV outgoing line II, and the condition of power loss of the whole plant cannot be caused.

As shown in fig. 3-6, since the "alternate arrangement" is required, it can be seen from the cross-sectional views 4-6 that the #2 main incoming circuit must be connected to the casing 2 and the #2 outgoing line to the casing 3. However, because of the safety distance limit between the equipment for live overhaul at different times, the wires of the sleeve 2 and the sleeve 3 cannot be directly crossed and connected to a 28m framework, and the distance needs to be kept.

To achieve this, the present solution adds a 33m architecture. In the "intermediate space", the terminals of the bushing 3 are connected to the wires of the 28m architecture and then to the wires of the 33m architecture. In the interval of the #2 main transformer incoming line, a 33m lead is connected with a 28m lead and then connected with a #2 main transformer incoming line loop.

The scheme #2 incoming and outgoing wire string needs to occupy three intervals, a 33m framework needs to be arranged, complexity of the framework and a lead is increased, and occupied area is enlarged.

The utility model has the following contents:

for solving distribution device only has two clusters, when the circuit of the same name adopted "alternative arrangement", framework and lead wire complexity, area big problem, the utility model aims to provide a framework is simple with the lead wire, and the circuit of the same name that area is little inserts different side generating line alternative arrangement structure. The distribution device of power plant or transformer substation adopts 3/2 circuit breaker wiring form, and when distribution device only had two strings, adopts HGIS arrangement form this moment, is applicable to the utility model discloses the different side bus alternate arrangement structure of circuit access of same name.

The utility model discloses by following technical scheme implement: a homonymy loop is connected with buses on different sides in an alternating arrangement structure, the homonymy loop comprises a bus I and a bus II, a first 3/2 circuit breaker wiring unit and a second 3/2 circuit breaker wiring unit are connected between the bus I and the bus II, the first 3/2 circuit breaker wiring unit comprises a first incoming line side circuit breaker, a first middle circuit breaker and a first outgoing line side circuit breaker which are arranged in a line and connected in sequence, a first sleeve is arranged between the first incoming line side circuit breaker and the first middle circuit breaker, and a second sleeve is arranged between the first middle circuit breaker and the first outgoing line side circuit breaker; the second 3/2 circuit breaker wiring unit comprises a second incoming line side circuit breaker, a second middle circuit breaker and a second outgoing line side circuit breaker which are arranged in a line and connected in sequence, a third sleeve is arranged between the second incoming line side circuit breaker and the second middle circuit breaker, and a wiring terminal in the third sleeve is connected with the output end of the 1# generator set through a wire; a fourth sleeve is arranged between the second middle breaker and the second breaker close to the outlet side, and a connecting terminal in the fourth sleeve is connected with the second outlet through a lead; the first bushing extends to a position between the first middle breaker and the first outgoing line side-close breaker, and the wiring terminal in the first bushing is connected with the first outgoing line through a wire; the second sleeve extends to first middle circuit breaker with first being close to between the inlet wire side circuit breaker, binding post passes through the wire with 2# generating set output in the second sleeve and is connected.

The utility model has the advantages that:

1. the #2 incoming and outgoing lines occupy 3 intervals before improvement, and are optimized to only occupy one interval, so that the floor area of the power distribution device is reduced.

2. The number and the height of the incoming and outgoing line framework and the bus structure are reduced, the engineering cost is reduced, and the expansion is facilitated.

Description of the drawings:

FIG. 1 is a schematic representation of a wiring format that does not employ an "alternating arrangement";

FIG. 2 is a schematic representation of a wiring pattern in an "alternating arrangement";

FIG. 3 is a plan view of a wiring form in an "alternate arrangement" prior to modification;

FIG. 4 is a sectional view of the spacing of the main transformer incoming line of the wiring form #2 in an "alternate arrangement" before modification;

FIG. 5 is a cross-sectional view of the intermediate space of wiring pattern #2 in an "alternating arrangement" prior to modification;

FIG. 6 is a sectional view showing the interval between the outgoing lines in the wiring pattern #2 before modification;

FIG. 7 is a plan view of the present invention in the form of "alternate" wiring;

fig. 8 is the cross-sectional view of the connection form #2 main transformer incoming line and #2 outgoing line interval of the present invention, which is arranged alternately.

Fig. 9 is a partial enlarged view of a portion a in fig. 7.

A first sleeve 1 and a second sleeve 2.

The specific implementation mode is as follows:

as shown in fig. 7-9, an alternative arrangement structure for connecting homonymous loops to buses on different sides includes a bus I and a bus II, a first 3/2 circuit breaker wiring unit and a second 3/2 circuit breaker wiring unit are connected between the bus I and the bus II, the first 3/2 circuit breaker wiring unit includes a first incoming-side-close circuit breaker QF4, a first intermediate circuit breaker QF5 and a first outgoing-side-close circuit breaker QF6 which are arranged in a line and connected in sequence, a first bushing 1 is arranged between the first incoming-side-close circuit breaker QF4 and the first intermediate circuit breaker QF5, and a second bushing 2 is arranged between the first intermediate circuit breaker QF5 and the first outgoing-side-close circuit breaker QF 6; the second 3/2 circuit breaker wiring unit comprises a second incoming line side circuit breaker QF1, a second middle circuit breaker QF2 and a second outgoing line side circuit breaker QF3 which are arranged in a row and connected in sequence, a third sleeve is arranged between the second incoming line side circuit breaker QF1 and the second middle circuit breaker QF2, and a wiring terminal in the third sleeve is connected with the output end of the No. 1 generator set through a wire; a fourth sleeve is arranged between the second middle breaker QF2 and the second outgoing line side breaker QF3, and a connecting terminal in the fourth sleeve is connected with the second outgoing line through a wire; the first bushing 1 extends to a position between the first middle breaker QF5 and the first outgoing line side breaker QF6, and the inner wiring terminal of the first bushing 1 is connected with the first outgoing line through a wire; the second sleeve 2 extends to a position between the first middle breaker QF5 and the first incoming line side breaker QF4, and the wiring terminal in the second sleeve 2 is connected with the output end of the 2# generating set through a wire.

The utility model discloses in, make originally lie in first being close to between inlet wire side circuit breaker QF4 and the first middle circuit breaker QF5 first sleeve pipe 1 extension to first middle circuit breaker QF5 and first being close to between the side circuit breaker QF6 of being qualified for the next round of competitions, and lie in first middle circuit breaker QF5 and first second sleeve pipe 2 that is close to between the side circuit breaker QF6 of being qualified for the next round of competitions and prolong to first middle circuit breaker QF5 and first being close to between inlet wire side circuit breaker QF4, utilize SF6 generating line extension sheathed tube position, thereby directly realize the exchange of first sleeve pipe 1 and 2 spatial position of second sleeve pipe, need not increase the interval, also need not increase the 33m framework, can satisfy the requirement that #1 business turn over line and #2 business turn over line homonymy return circuit insert different bus sides respectively. Compared with the scheme before improvement, the method reduces the number of intervals occupied by the #2 incoming and outgoing lines and the 33m framework, thereby saving the construction cost and the occupied area.

Interpretation of terms:

3/2 circuit breaker wiring: every two incoming and outgoing lines and three circuit breakers are alternately arranged to form a string, two ends of each string are respectively connected to a group of buses, and the wiring mode is called 3/2 circuit breaker wiring, also called half circuit breaker wiring. The 3/2 circuit breaker wiring is a double-connection multi-ring wiring without a multi-loop aggregation point, one loop is powered by two circuit breakers, and the wiring mode is widely applied to ultrahigh voltage distribution devices of large and medium power plants.

HGIS equipment: according to the insulating medium of the distribution device, open distribution devices (AIS) and SF6 totally enclosed switchgear (GIS) can be classified. The bus is not arranged in a GIS of an SF6 air chamber, and the high-voltage switch equipment between the GIS and the AIS is an HGIS. The HGIS adopts GIS main equipment, combines the characteristics of open type switch equipment to form a mixed type GIS product according to the specific main wiring requirements, and is mainly characterized in that main components of a GIS-shaped circuit breaker, a disconnecting switch, a current transformer and the like are combined in a metal shell in a split phase manner, and an outlet sleeve is connected with an open type bus, an open type voltage transformer and a lightning arrester through a flexible conductor, thereby belonging to a mixed type power distribution device.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. A homonymy loop is connected with buses on different sides in an alternating arrangement structure, the homonymy loop comprises a bus I and a bus II, a first 3/2 circuit breaker wiring unit and a second 3/2 circuit breaker wiring unit are connected between the bus I and the bus II, the first 3/2 circuit breaker wiring unit comprises a first incoming line side circuit breaker, a first middle circuit breaker and a first outgoing line side circuit breaker which are arranged in a line and connected in sequence, a first sleeve is arranged between the first incoming line side circuit breaker and the first middle circuit breaker, and a second sleeve is arranged between the first middle circuit breaker and the first outgoing line side circuit breaker; the second 3/2 circuit breaker wiring unit comprises a second incoming line side circuit breaker, a second middle circuit breaker and a second outgoing line side circuit breaker which are arranged in a line and connected in sequence, a third sleeve is arranged between the second incoming line side circuit breaker and the second middle circuit breaker, and a wiring terminal in the third sleeve is connected with the output end of the 1# generator set through a wire; a fourth sleeve is arranged between the second middle circuit breaker and the second circuit breaker close to the outgoing line side, and a wiring terminal in the fourth sleeve is connected with the second outgoing line through a wire; the first bushing is extended to a position between the first middle breaker and the first outgoing line side breaker, and the wiring terminal in the first bushing is connected with the first outgoing line through a wire; the second sleeve extends to first middle circuit breaker with first being close to between the inlet wire side circuit breaker, binding post passes through the wire with 2# generating set output in the second sleeve and is connected.

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