CN1168014A

CN1168014A - Electrical main connecting wire for superhigh voltage distribution equipment

Info

Publication number: CN1168014A
Application number: CN 97107573
Authority: CN
Inventors: 杜光
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-06-28
Filing date: 1997-06-28
Publication date: 1997-12-17

Abstract

A connection method for electric trunk of extra-high-voltage distribution equipment features that multiple breaker units with a set of isolating switch at both sides are serially connected to form a closed loop, and a set of isolating switch is parallelly connected respectively to both sides of each unit, whose another end is connected to two different by-pass bus segments. A set of isolating switch is serially connected between any isolating switch and by-pass bus segment. A set of by-pass breaker is connected across the line between two isolating switches and another bus segment. A set of isolating switch is connected across two by-pass bus segments. The incoming and outgoing loops are connected via isolating switch to connecting line between units. Its advantages are high reliability and less number of breakers and current transformers.

Description

A kind of electrical main connecting wire for superhigh voltage distribution equipment

The present invention relates to a kind of electrical main connecting wire for superhigh voltage distribution equipment, be suitable for the above power distribution equipment electrical main connecting wire of 500KV.

According to the knowledge of the applicant, at present the superhigh voltage distribution equipment electrical main connecting wire mode that mainly adopts in countries in the world has a ring connection and a half breaker wiring etc.Its ring connection must move when circuit breaker failure, maintenance in open loop, causes system splitting and non-fault element to stop transport easily; Though a half breaker wiring has higher power supply reliability and operational flexibility, become the main mode of connection of present countries in the world electrical main connecting wire for superhigh voltage distribution equipment, but still there is following deficiency in it: first, when circuit breaker overhauls, turnover line loop or power distribution equipment fault may cause non-fault element to be forced to stop transport; The second, during the bus maintenance, the reliability of whole power distribution equipment is all lower; The 3rd, busbar fault will be if a breaker failure then will make the loop that is connected with this circuit breaker stop transport; The 4th, the circuit breaker of use, the quantity of current transformer are still more, and the relation of they and feeder number is 1.5N (N is turnover line loop number); The 5th, because two groups of buses are arranged,, need configuration quadruplet bus differential protecting according to the principle of relaying protection configuration " dualization ".

Purpose of the present invention is intended to overcome above-mentioned the deficiencies in the prior art; propose a kind ofly both to have significantly reduced circuit breaker, current transformer quantity and need not to dispose bus differential protecting, fault element is forced to the stoppage in transit problem and replaces the electrical main connecting wire for superhigh voltage distribution equipment of stoppage in transit circuit breaker operation with bypass breaker when circuit breaker maintenance and fault is stopped transport nothing but again.

A kind of technical scheme that realizes above-mentioned purpose is: a kind of electrical main connecting wire for superhigh voltage distribution equipment, comprise circuit breaker, isolating switch, bypass breaker and bypass isolating switch, it is characterized in that: the breaker unit that a plurality of both sides is equipped with one group of isolating switch respectively is connected into closed circuit, when unit number is even number, in each both sides, unit respectively and connect one group of bypass isolating switch, the other end of bypass isolating switch is respectively received on two different hospital bus bar sections, seal in one group of bypass isolating switch again between a bypass isolating switch in office and the hospital bus bar section, one group of bypass breaker of cross-over connection between the line of two bypass isolating switches and another hospital bus bar section, one group of bypass isolating switch of cross-over connection between two bypass bus section, busbar sections, the turnover line loop is connected between the unit on the line by isolating switch.

The another kind of technical scheme that realizes above-mentioned purpose is: a kind of electrical main connecting wire for superhigh voltage distribution equipment, comprise circuit breaker, isolating switch, bypass breaker and bypass isolating switch, it is characterized in that: the breaker unit that a plurality of both sides is equipped with one group of isolating switch respectively is connected into closed circuit, when unit number is odd number, on the line of any two unit and connect two groups of bypass isolating switch, the other end of two groups of bypass isolating switch is received respectively on two different hospital bus bar sections, in each both sides, unit respectively and connect one group of bypass isolating switch, the other end of bypass isolating switch is respectively received on two different hospital bus bar sections, seal in one group of bypass isolating switch again between a bypass isolating switch in office and the hospital bus bar section, one group of bypass breaker of cross-over connection between the line of two bypass isolating switches and another hospital bus bar section, another group bypass isolating switch of cross-over connection between two bypass bus section, busbar sections, the turnover line loop is connected between the unit on the line by isolating switch.

The present invention is in conjunction with the following embodiment that will describe in detail, and the effect of generation is: the first, and when a certain circuit breaker is stopped transport,, can not cause non-fault element to be forced to stop transport even occur element fault more yet, thoroughly solved the technical barrier that non-fault element is forced to stop transport; The second, when circuit breaker maintenance and fault, the ingenious closure operation that utilizes bypass breaker to guarantee loop has solved the problem of the easy off-the-line of system in this case; The 3rd, because main electrical scheme of the present invention does not have bus, the relevant issues of having brought when thoroughly having eliminated busbar fault and busbar fault are not as needing to be provided with differential protection; The 4th, the present invention will reduce (0.5N-1) group circuit breaker summation current transformer (N is a turnover line loop number) than a half breaker wiring, has significantly reduced construction investment.

The present invention is further detailed explanation below in conjunction with accompanying drawing:

Fig. 1 is the main electrical scheme of the present invention when unit number is 10 (even numbers).

Fig. 2 is the main electrical scheme of the present invention when unit number is 9 (odd numbers).

Among the figure: 1DL---10DL is the loop circuit breaker, 1PG--10PG, PG ₁, PG ₂, PG ₃Be bypass isolating switch, PDL is a bypass breaker, L ₁--L ₁₀Be the turnover line loop, ijG (i=1--10, j=1,2,3) is isolating switch.

Embodiment one; Referring to Fig. 1,10 both sides are equipped with one group of isolating switch ijG (i=1--10 respectively, j=2.3) circuit breaker iDL (i=1--10) unit strings is unified into closed circuit, in each both sides, unit respectively and meet one group of bypass isolating switch iPG (i=1--10), the other end of bypass isolating switch iPG (i=1--10) is respectively received on two different hospital bus bar sections (I, II), between bypass isolating switch 1PG and hospital bus bar section II, insert bypass isolating switch PG1 again, at bypass isolating switch (1PG, PG ₁) line and one group of bypass breaker PDL of another hospital bus bar section I cross-over connection, one group of bypass isolating switch PG of cross-over connection between two bypass bus section, busbar sections (I, II) ₂, 10 turnover line loop L ₁--L ₁₀Be connected between the unit on the line by isolating switch ilG (i=1--10), constitute electrical main connecting wire for superhigh voltage distribution equipment.The course of work under different situations is: if circuit breaker is an example with circuit breaker 2DL fault when breaking down; protection action tripping circuit breaker (1DL, 2DL); at first draw back isolating switch (22G, 33G); circuit breaker 2DL is isolated; circuit breaker 1DL then closes; recover turnover line loop L2 operation, the bypass isolating switch of closing again (1PG, PG2), bypass breaker PDL are to two sections hospital bus bar sections (I, II) charging, the bypass isolating switch of closing after the charging (PG ₁, 2PG, 3PG), disconnect bypass isolating switch (1PG, PG ₂), realize that bypass breaker PDL replaces stoppage circuit breaker 2DL operation, guarantees the loop closure; When if circuit breaker need overhaul, be example also with maintenance circuit breaker 2DL, at first close bypass isolating switch (1PG, PG ₂), bypass breaker PDL charges the bypass isolating switch of closing then (PG to two sections hospital bus bars ₁, 2PG, 3PG), disconnect bypass isolating switch (1PG, PG at last ₂), circuit breaker 2DL, realize that promptly bypass breaker PDL replaces loop circuit breaker 2DL operation, guarantees the loop closure; If the turnover line loop breaks down, with turnover line loop L ₂Breaking down is example, and circuit breaker (1DL, 2DL) automatic disconnection this moment disconnects isolating switch 21G, turnover line loop L ₂Isolate with the main electrical scheme loop, the circuit breaker that closes again (1DL, 2DL) can recover the loop closure state.In sum, present embodiment can reach purpose of the present invention fully.Both guarantee the reliability of loop, significantly reduced construction investment again.

Embodiment two: referring to Fig. 2 (and in conjunction with Fig. 1), owing to advance by the several 9 (L of line loop ₁--L ₉) be odd number, at this moment, only need in Fig. 1, to reduce between A, the B circuit breaker 10DL, bypass isolating switch 10PG and isolating switch (101G, 102G, 13G); Only need cross-over connection bypass isolating switch PG between the line of circuit breaker (1DL, 9DL) unit and hospital bus bar section I ₃Owing between the line of circuit breaker (1DL, 9DL) unit and hospital bus bar section II, bypass isolating switch (PG is arranged ₁, 1PG), played the effect of isolating switch, need not to increase again another the group bypass isolating switch.Other structure is identical with embodiment one, and entire work process is with above-mentioned.

The Zi Gong 500KV power distribution equipment electrical main connecting wire of sending engineering with China two beach 500KV is an example; by half breaker wiring of final design; six strings, 12 loops are considered; adopt the mode of connection of the embodiment of the invention one main electrical scheme can reduce (0.5 * 12-1)=5 groups of circuit breaker, current transformers; surplus 5 groups of circuit breakers are worth 500 ten thousand yuan; 5 groups of current transformers are worth about 2,000,000 yuan; reduce the quadruplet bus differential protecting and be worth nearly 2,000,000 yuan; add the secondary cable of corresponding minimizing, the investment of whole power distribution equipment will be saved nearly ten million yuan.By this calculating, engineering is sent on whole two beaches, adopts main electrical scheme of the present invention, will save surplus the construction investment 3,000 ten thousand yuan, adopts this electrical main connecting wire for superhigh voltage distribution equipment in the engineering if send in the power station, Three Gorges in future, with the investment of saving more than hundred million yuan.

Claims

1. electrical main connecting wire for superhigh voltage distribution equipment, comprise circuit breaker, isolating switch, bypass breaker and bypass isolating switch, it is characterized in that: the breaker unit that a plurality of both sides is equipped with one group of isolating switch respectively is connected into closed circuit, when unit number is even number, in each both sides, unit respectively and connect one group of bypass isolating switch, the other end of bypass isolating switch is respectively received on two different hospital bus bar sections, seal in one group of bypass isolating switch again between a bypass isolating switch in office and the hospital bus bar section, one group of bypass breaker of cross-over connection between the line of two bypass isolating switches and another hospital bus bar section, one group of bypass isolating switch of cross-over connection between two bypass bus section, busbar sections, the turnover line loop is connected between the unit on the line by isolating switch.

2. electrical main connecting wire for superhigh voltage distribution equipment, comprise circuit breaker, isolating switch, bypass breaker and bypass isolating switch, it is characterized in that: the breaker unit that a plurality of both sides is equipped with one group of isolating switch respectively is connected into closed circuit, when unit number is odd number, on the line of any two unit and connect two groups of bypass isolating switch, the other end of two groups of bypass isolating switch is received respectively on two different hospital bus bar sections, in each both sides, unit respectively and connect one group of bypass isolating switch, the other end of bypass isolating switch is respectively received on two different hospital bus bar sections, seal in one group of bypass isolating switch again between a bypass isolating switch in office and the hospital bus bar section, one group of bypass breaker of cross-over connection between the line of two bypass isolating switches and another hospital bus bar section, another group bypass isolating switch of cross-over connection between two bypass bus section, busbar sections, the turnover line loop is connected between the unit on the line by isolating switch.