CN104953698A - Simplifying method for backup automatic switching device for double-internal-bridge connection - Google Patents

Abstract

The invention discloses a simplifying method for a backup automatic switching device for double-internal-bridge connection. The double-internal-bridge connection comprises three power input lines, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, a circuit breaker QF5, a first main transformer, a second main transformer and a third main transformer, wherein the three power input lines include a first circuit, a second circuit and a third circuit, the circuit breaker QF1, the circuit breaker QF3 and the circuit breaker QF5 are circuit breakers for the first circuit, the second circuit and the third circuit respectively, the circuit breaker QF2 is a bridge circuit breaker between the first circuit and the second circuit, the circuit breaker QF4 is a bridge circuit breaker between the second circuit and the third circuit, and the backup automatic switching device for the double-internal-bridge connection is simplified into two internal bridge backup automatic switching device bodies and one expanded internal bridge backup automatic switching device body. The simplifying method for the backup automatic switching device for the double-internal-bridge connection has the advantages that the backup automatic switching device is simple and clear in operation mode after being simplified, memorizing is facilitated, and requirements can be met only by means of logical arrangement among existing simple backup automatic switching devices.

Description

The method for simplifying of two internal bridge prepared auto restart

Technical field

The present invention relates to a kind of three-way power to power the method for simplifying of two internal bridge prepared auto restart, belong to electrical power distribution electro-technical field.

Background technology

In the primary connection circuit of many 110kV electric substations, have employed two internal bridges that three-way power is powered, corresponding automatic throw-in equipment of emergency power supply (abbreviation prepared auto restart) " exhaustive " operational mode, nearly kind more than 21, be not easy memory; This wiring prepared auto restart does not commercially have product supply, needs to design especially, and this wiring prepared auto restart logic formed with " method of exhaustion " is also very complicated, and operational mode is sometimes also exhaustive complete or be difficult to entirely exhaustive.Case history proves, the automatic throw-in equipment of emergency power supply of complicated wiring can be reduced to several simple wiring prepared auto restart and form.But how two internal bridge prepared auto restart simplifies, how the correctness of operational mode is verified, prior art is all unresolved.The present invention proposes the method for simplifying of two internal bridge prepared auto restart, and adopts the method for logic algebra to verify the correctness of this wiring prepared auto restart operational mode.

Summary of the invention

The object of the present invention is to provide the method for simplifying of two internal bridge prepared auto restart, can be 220kV and following electric pressure electric substation to transmission and distribution networks, be that two internal bridge prepared auto restarts of three Power supplies are reduced to simple wiring prepared auto restart by primary connection circuit, and verify the correctness of this wiring prepared auto restart operational mode with Logical Algebra Method.

Object of the present invention is achieved by the following technical programs:

The method for simplifying of a kind of pair of internal bridge prepared auto restart, described pair of internal bridge, there is three-way power inlet wire, be respectively circuit one, circuit two, circuit three, also comprise circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5, a main transformer, No. two main transformers, No. three main transformers, described circuit breaker Q F1, circuit breaker Q F3, circuit breaker Q F5 is respectively circuit one, circuit two, the incoming power circuit breaker of circuit three, described circuit breaker Q F2 is the bridge circuit breaker between circuit one and circuit two, circuit breaker Q F4 is the bridge circuit breaker between circuit two and circuit three, a described main transformer, No. two main transformers, No. three main transformers are respectively circuit one, circuit two, the main transformer of circuit three, at a main transformer, No. two main transformers, primary side or the power line trackside of No. three main transformers are connected to voltage transformer TV1 respectively, voltage transformer TV2, voltage transformer TV3,

The method for simplifying of two internal bridge prepared auto restart is: be namely reduced to and be made up of 2 internal bridge prepared auto restarts and 1 expanded inter-bridge connection prepared auto restart;

When circuit one, circuit two, circuit three power supply all run, prepared auto restart control logic is made up of 2 internal bridge prepared auto restarts, the first internal bridge prepared auto restart comprising duplicate supply three circuit breakers be made up of circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, the second internal bridge prepared auto restart of duplicate supply three circuit breakers be made up of circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5;

When circuit one, circuit three power supply run, when circuit two power supply is out of service, prepared auto restart control logic is made up of expanded inter-bridge connection prepared auto restart logic, is namely made up of the expanded inter-bridge connection prepared auto restart of duplicate supply four circuit breaker circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F4, circuit breaker Q F5;

The logic algebra expression formula that described first internal bridge prepared auto restart operational mode meets is:

$A\stackrel{\‾}{B}C+\mathrm{AB}\stackrel{\‾}{C}+\stackrel{\‾}{A}\mathrm{BC}+A\stackrel{\‾}{B}\stackrel{\‾}{C}+\stackrel{\‾}{A}\stackrel{\‾}{B}C+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}$

The logic algebra expression formula that described second internal bridge prepared auto restart operational mode meets is:

$\mathrm{CD}\stackrel{\‾}{E}+C\stackrel{\‾}{D}E+\stackrel{\‾}{C}\mathrm{DE}+C\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{C}\stackrel{\‾}{D}E+\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}$

The logic algebra expression formula that described expanded inter-bridge connection prepared auto restart operational mode meets is:

Described first internal bridge prepared auto restart and the second internal bridge prepared auto restart logical relation are "AND"; The prepared auto restart logical relation that described expanded inter-bridge connection prepared auto restart and the first internal bridge prepared auto restart and the second internal bridge prepared auto restart are formed jointly is "or"; Two internal bridge prepared auto restart operational mode logic algebra expression formulas after simplification are:

Wherein, A, B, C, D, E represent that circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5 are combined floodgate running status respectively, are expressed as 1 by logic algebra; With represent that circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5 are separating brake running status, are hot stand-by duty, are expressed as 0 by logic algebra respectively;

The further abbreviation of operational mode of two internal bridge prepared auto restart is:

$\begin{array}{c}\mathrm{AB}\stackrel{\‾}{C}D\stackrel{\‾}{E}+A\stackrel{\‾}{B}C\stackrel{\‾}{D}E+\stackrel{\‾}{A}\mathrm{BC}\stackrel{\‾}{D}E+A\stackrel{\‾}{B}\mathrm{CD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\mathrm{BCD}\stackrel{\‾}{E}+A\stackrel{\‾}{B}\stackrel{\‾}{C}\mathrm{DE}+\stackrel{\‾}{A}\stackrel{\‾}{B}C\stackrel{\‾}{D}E+A\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{D}E\\ +\stackrel{\‾}{A}\stackrel{\‾}{B}\mathrm{CD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\mathrm{DE}+\mathrm{AB}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}+A\stackrel{\‾}{B}C\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{A}\mathrm{BC}\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{D}E+\stackrel{\‾}{A}\stackrel{\‾}{B}C\stackrel{\‾}{\mathrm{DE}}+A\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}\\ +\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}+(\mathrm{AB}\stackrel{\‾}{C}D\stackrel{\‾}{E}+\stackrel{\‾}{A}B\stackrel{\‾}{C}\mathrm{DE}+A\stackrel{\‾}{B}\stackrel{\‾}{C}D\stackrel{\‾}{E}+\stackrel{\‾}{A}B\stackrel{\‾}{C}\stackrel{\‾}{D}E)\end{array}$

1 operational mode of the two internal bridge prepared auto restart of logic algebra expression formula representative of every 1 field in above formula, totally 21 kinds of operational modes.

Object of the present invention can also be realized further by following technical measures:

The method for simplifying of aforementioned pair of internal bridge prepared auto restart, when circuit two power loss, should locking mutually between the first internal bridge prepared auto restart and the second internal bridge prepared auto restart, should have operate time differential time.

The method for simplifying of aforementioned pair of internal bridge prepared auto restart, wherein operate time is differential between 0.5 ~ 1 second.

The method for simplifying of aforementioned pair of internal bridge prepared auto restart, when under circuit breaker Q F3 disconnection, stop using the first internal bridge prepared auto restart, the second internal bridge prepared auto restart, only enable expanded inter-bridge connection prepared auto restart.

The method for simplifying of aforementioned pair of internal bridge prepared auto restart, wherein the first internal bridge prepared auto restart, the second internal bridge prepared auto restart, expanded inter-bridge connection prepared auto restart are electromagnetic type backup auto-activating device or microcomputer backup auto-activating device.

The method for simplifying of aforementioned pair of internal bridge prepared auto restart, wherein the first internal bridge prepared auto restart, the second internal bridge prepared auto restart, expanded inter-bridge connection prepared auto restart logic are realized by integrated 3 the prepared auto restart logics of PLC backup auto-activating device.

The method for simplifying of aforementioned pair of internal bridge prepared auto restart, wherein the first internal bridge prepared auto restart, the second internal bridge prepared auto restart, expanded inter-bridge connection prepared auto restart logic are realized by integrated 3 the prepared auto restart logics of microcomputer backup auto-activating device.

Compared with prior art, the invention has the beneficial effects as follows:

1. two internal bridge prepared auto restarts of three Power supplies are reduced to 2 duplicate supply internal bridge prepared auto restarts and 1 duplicate supply expanded inter-bridge connection prepared auto restart composition, and operational mode is simply clear, is convenient to memory.

2. after simplifying, each composition of two internal bridge prepared auto restart can run together, also can run respectively; When some equipment interruption maintenance, can enable part prepared auto restart and run, avoid prepared auto restart and all stop transport, thus operational flexibility is stronger, reaches the effect strengthening backup auto-activating device function and the scope of application.

3. two internal bridge prepared auto restarts of three Power supplies are reduced to the simple prepared auto restart of three described in the present invention program, it is all prepared auto restart common in electrical network, do not need to redesign and produce, only need arrange by respective logic between existing simple prepared auto restart, can grid requirements be met.

4. the logic algebra expression formula of provided by the invention pair of internal bridge prepared auto restart operational mode, simply clear, easy to understand, and it is convenient to implement, and verifies the correctness that operational mode simplifies.

Accompanying drawing explanation

Fig. 1 is two internal bridge circuit diagrams that method for simplifying of the present invention is applied;

Fig. 2 is the internal bridge figure of the 1st duplicate supply three circuit breaker be made up of circuit breaker Q F1, QF2, QF3 of the present invention;

Fig. 3 is the internal bridge figure of the 2nd duplicate supply three circuit breaker that the present invention is made up of circuit breaker Q F3, QF4, QF5;

Fig. 4 is the expanded inter-bridge connection figure of duplicate supply four circuit breakers be made up of circuit breaker Q F1, QF2, QF4, QF5 of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the invention will be further described.

As shown in Figure 1, be that electric substation's primary connection circuit of the transmission and distribution networks that method of the present invention is applied is the two internal bridge of standard, described pair of internal bridge, has three-way power inlet wire, is respectively circuit one, circuit two, circuit three, also comprises circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5, a main transformer, No. two main transformers, No. three main transformers, described circuit breaker Q F1, circuit breaker Q F3, circuit breaker Q F5 is respectively circuit one, circuit two, the incoming power circuit breaker of circuit three, described circuit breaker Q F2 is the bridge circuit breaker between circuit one and circuit two, and circuit breaker Q F4 is the bridge circuit breaker between circuit two and circuit three, a described main transformer, No. two main transformers, No. three main transformers are respectively circuit one, circuit two, the main transformer of circuit three, at a main transformer, No. two main transformers, primary side or the power line trackside of No. three main transformers are connected to voltage transformer TV1 respectively, voltage transformer TV2, voltage transformer TV3.

Simplification process of the present invention is specifically implemented as follows:

1. the simplification of pair internal bridge and prepared auto restart thereof

The operational mode of 1.1 pairs of internal bridge prepared auto restarts

Two internal bridge adopts three-way power to power, and its main wiring diagram is shown in Fig. 1.Because (namely between circuit one and circuit two, between circuit two and circuit three, between circuit one and circuit three) between every two-way power supply can not paired running for a long time, circuit breaker in loop between every two-way power supply at least should have 1 circuit breaker to be hot stand-by duty, therefore, two internal bridge prepared auto restart can list 21 kinds of operational modes, specifically in table 1 by " method of exhaustion ".

The table 1 pair operational mode that internal bridge prepared auto restart is possible

Mode	Operating circuit breaker	Stand-by heat circuit breaker	Course of action
				1	QF 1、QF 2、QF 5	QF 3、QF 4	When circuit one loses power supply, jump QF 1, throw QF 3Or throw QF 4; When circuit three loses power supply, jump QF5, throw QF 3Or QF 4；
2	QF 1、QF 3、QF 5	QF 2、QF 4	QF is jumped when circuit one loses power supply 1Throw QF 2; QF is jumped when circuit two loses power supply 3Throw QF 2Or throw QF 4; QF is jumped when circuit three loses power supply 5Throw QF 4；
				3	QF 1、QF 3、QF 4	QF 2、QF 5	When circuit one loses power supply, jump QF 1, throw QF 2; When circuit two loses power supply, jump QF 3, throw QF 2Or throw QF 5；
4	QF 1、QF 2、QF 4	QF 3、QF 5	When circuit one loses power supply, jump QF 1, throw QF 3Or throw QF 5；
				5	QF 2、QF 4、QF 5	QF 1、QF 3	When circuit three loses power supply, jump QF 5, throw QF 3Or throw QF 1；
6	QF 2、QF 3、QF 5	QF 1、QF 4	When circuit two loses power supply, jump QF 3, throw QF 1Or throw QF 4; When circuit three loses power supply, jump QF 5, throw QF 4；
				7	QF 2、QF 3、QF 4	QF 1、QF 5	When circuit two loses power supply, jump QF 3, throw QF 1Or throw QF 5；
8	QF 1、QF 4、QF 5	QF 2、QF 3	When circuit one loses power supply, jump QF 1, throw QF 2; When circuit three loses power supply, jump QF 5, throw QF 3Or throw QF 2；
				9	QF 1、QF 2	QF 2、QF 4、QF 5	When circuit one loses power supply, jump QF 1, throw QF 2Or throw QF 4、QF 5；
10	QF 1、QF 3	QF 2、QF 4、QF 5	When circuit one loses power supply, jump QF 1, throw QF 2; When circuit two loses power supply, jump QF 3, throw QF 2Or throw QF 4And QF 5；
				11	QF 3、QF 4	QF 1、QF 2、QF 5	When circuit two loses power supply, jump QF 3, throw QF 1And QF 2Or throw QF 5；
12	QF 2、QF 3	QF 1、QF 4、QF 5	When circuit two loses power supply, jump QF 3, throw QF 1、QF 4Or throw QF 5；
				13	QF 1、QF 5	QF 2、QF 3、QF 4	QF is jumped when circuit one loses power supply 1, throw QF 2、QF 3Or throw QF 2、QF 4; QF is jumped when circuit three loses power supply 5, throw QF 4、QF 3Or throw QF 2、QF 4；
14	QF 4、QF 5	QF 1、QF 2、QF 3	When circuit three loses power supply, jump QF 5, throw QF 3Or throw QF 1、QF 2；
				15	QF 3、QF 5	QF 1、QF 2、QF 4	When circuit two loses power supply, jump QF 3, throw QF 1And QF 2Or throw QF 4; When circuit three loses power supply, jump QF 5, throw QF 4；
16	QF 1、QF 4	QF 2、QF 3、QF 5	When circuit one loses power supply, jump QF 1, throw QF 2、QF 3Or throw QF 2、QF 5；
				17	QF 2、QF 5	QF 1、QF 3、QF 4	When circuit three loses power supply, jump QF 5, throw QF 3、QF 4Or throw QF 1、QF 4；
18	QF 1	QF 2、QF 3、QF 4、QF 5	When circuit one loses power supply, jump QF 1, throw QF 2、QF 3Or throw QF 2、QF 4、QF 5；
				19	QF 3	QF 1、QF 2、QF 4、QF 5	When circuit two loses power supply, jump QF 3, throw QF 1And QF 2Or throw QF 4And QF 5；
20	QF 5	QF 1、QF 2、QF 3、QF 4	When circuit three loses power supply, jump QF 5, throw QF 3、QF 4Or throw QF 1、QF 2、QF 4；

Note: no matter No. one, electric substation, No. two, No. three main transformers are for running or stopping using, but backup auto-activating device does not run accordingly, is inactive mode

The simplification of 1.2 pairs of internal bridges and prepared auto restart thereof

1.2.1 the simplification of two internal bridge

The two interior bridge primary connection circuit of Fig. 1 is simplified.When circuit one, circuit two, circuit three power supply all run, two interior bridge primary connection circuit can be made up of 2 internal bridges:

A. be made up of the internal bridge (see Fig. 2) of the 1st duplicate supply three circuit breaker circuit breaker Q F1, QF2, QF3, the operation of No. one, No. two main transformer is controlled by circuit breaker Q F1, QF2, QF3, and wherein QF2 is bridge circuit breaker;

B. be made up of the internal bridge (see Fig. 3) of the 2nd duplicate supply three circuit breaker circuit breaker Q F3, QF4, QF5, the operation of No. two, No. three main transformers is controlled by circuit breaker Q F3, QF4, QF5, and wherein circuit breaker Q F4 is bridge circuit breaker.

Equally, the prepared auto restart control logic of two internal bridges of three Power supplies also can be made up of 2 internal bridge prepared auto restarts:

A. the first internal bridge prepared auto restart of the 1st duplicate supply three circuit breakers is made up of circuit breaker Q F1, QF2, QF3;

B. the second internal bridge prepared auto restart of the 2nd duplicate supply three circuit breakers is made up of circuit breaker Q F3, QF4, QF5;

1.2.2 main electrical scheme when circuit two power supply does not run simplifies

When circuit one, the operation of circuit three power supply, circuit two power supply (stop transport containing circuit breaker Q F3 and overhaul and circuit breaker Q F3 stand-by heat) out of service, two interior bridge primary connection circuit becomes expanded inter-bridge connection: the expanded inter-bridge connection (see Fig. 4) being namely made up of duplicate supply four circuit breakers circuit breaker Q F1, QF2, QF4, QF5, the operation of No. one, No. two, No. three main transformer is controlled by circuit breaker Q F1, QF2, QF4, QF5, and wherein circuit breaker Q F2, QF4 are bridge circuit breaker.

Equally, when circuit two or circuit breaker Q F3 interruption maintenance or circuit breaker Q F3 stand-by heat, the prepared auto restart control logic of two internal bridge connection that three-way power is powered is expanded inter-bridge connection prepared auto restart, is namely made up of the expanded inter-bridge connection prepared auto restart of duplicate supply four circuit breaker circuit breaker Q F1, QF2, QF4, QF5.

1.2.3 the simplification of two internal bridge prepared auto restart

Road as seen from the above analysis, two internal bridge can be simplified to 3 simple primary connection circuit, namely can be made up of 2 internal bridges and 1 expanded inter-bridge connection, equally, two internal bridge prepared auto restart can be made up of 2 internal bridge prepared auto restarts and 1 expanded inter-bridge connection prepared auto restart.

2. the operational mode logic algebra that pair internal bridge prepared auto restart simplifies is expressed and verification of correctness

The Mathematical Modeling of 2.1 prepared auto restarts

Whether two internal bridge prepared auto restart can be reduced to is made up of 2 internal bridges and 1 expanded inter-bridge connection, by the method for logic algebra, we can prove that whether this method for simplifying is correct.The "on" position of circuit breaker and gate-dividing state can represent by logic algebra, represent that circuit breaker is "on" position by 1 of logic algebra, represent that circuit breaker is gate-dividing state by 0 of logic algebra.In Fig. 1, circuit breaker QF1, QF2, QF3, QF4, QF5 represent with A, B, C, D, E respectively, and A, B, C, D, E represent circuit breaker Q F1 respectively, QF2, QF3, QF4, QF5 are combined floodgate running status, are expressed as 1 by logic algebra; With expression circuit breaker Q F1, QF2, QF3, QF4, QF5 are separating brake running status respectively, are hot stand-by duty, are expressed as 0 by logic algebra.

2.1.1 the Mathematical Modeling of the first internal bridge prepared auto restart

As shown in Figure 2, in primary connection circuit circuit breaker QF1, QF2, QF3 operation with do not run, constitute internal bridge prepared auto restart 6 kinds of operational modes, one of them for stop using mode:

A. circuit breaker Q F1, QF3 run; Standby throwing circuit breaker Q F2; When circuit one loses power supply, tripping QF1 circuit breaker, QF2 circuit breaker in throwing; When circuit two loses power supply, tripping QF3 circuit breaker, QF2 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

B. circuit breaker Q F1, QF2 run; Standby throwing circuit breaker Q F3; When circuit one loses power supply, tripping QF1 circuit breaker, QF3 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

C. circuit breaker Q F2, QF3 run; Standby throwing circuit breaker Q F1; When circuit two loses power supply, tripping QF3 circuit breaker, QF1 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

D. circuit breaker Q F1 runs; Standby throwing circuit breaker Q F2, QF3; When circuit one loses power supply, tripping QF1 circuit breaker, QF2, QF3 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

E. operating circuit breaker QF3; Standby throwing circuit breaker Q F1, QF2; When circuit two loses power supply, tripping QF3 circuit breaker, QF1, QF2 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

F. no matter No. one, electric substation, No. two main transformers are for running or stopping using, but backup auto-activating device does not run accordingly, is inactive mode.The logic algebra expression formula of its operational mode is:

The logic algebra expression formula obtaining the first internal bridge prepared auto restart operational mode thus satisfied is (1) formula:

$A\stackrel{\‾}{B}C+\mathrm{AB}\stackrel{\‾}{C}+\stackrel{\‾}{A}\mathrm{BC}+A\stackrel{\‾}{B}\stackrel{\‾}{C}+\stackrel{\‾}{A}\stackrel{\‾}{B}C+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}---\left(1\right)$

2.1.2 the Mathematical Modeling of the second internal bridge prepared auto restart

As shown in Figure 3, in primary connection circuit circuit breaker QF3, QF4, QF5 operation with do not run, constitute the second internal bridge prepared auto restart 6 kinds of operational modes, one of them for stop using mode:

A. circuit breaker Q F3, QF5 run; Standby throwing circuit breaker Q F4; When circuit two loses power supply, tripping QF3 circuit breaker, QF4 circuit breaker in throwing; When circuit three loses power supply, tripping QF5 circuit breaker, QF4 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

B. circuit breaker Q F3, QF4 run; Standby throwing circuit breaker Q F5; When circuit two loses power supply, tripping QF3 circuit breaker, QF5 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

C. circuit breaker Q F4, QF5 run; Standby throwing circuit breaker Q F3; When circuit three loses power supply, tripping QF5 circuit breaker, QF3 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

D. circuit breaker Q F3 runs; Standby throwing circuit breaker Q F4, QF5; When circuit two loses power supply, tripping QF3 circuit breaker, QF4, QF5 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

E. circuit breaker Q F5 runs; Standby throwing circuit breaker Q F3, QF4; When circuit three loses power supply, tripping QF5 circuit breaker, QF3, QF4 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

F. no matter No. two, electric substation, No. three main transformers are for running or stopping using, but backup auto-activating device does not run accordingly, is inactive mode.The logic algebra expression formula of its operational mode is:

Obtain logic algebra expression formula (2) formula that in second, bridge prepared auto restart operational mode meets thus:

$\mathrm{CD}\stackrel{\‾}{E}+C\stackrel{\‾}{D}E+\stackrel{\‾}{C}\mathrm{DE}+C\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{C}\stackrel{\‾}{D}E+\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}---\left(2\right)$

2.1.3 the Mathematical Modeling of expanded inter-bridge connection prepared auto restart

As shown in Figure 4, in primary connection circuit circuit breaker QF1, QF2, QF4, QF5 operation with do not run, constitute expanded inter-bridge connection prepared auto restart 12 kinds of operational modes, one of them for stop using mode:

A. circuit breaker Q F1, QF4, QF5 run; Standby throwing circuit breaker Q F2; When circuit one loses power supply, tripping QF1 circuit breaker, QF2 circuit breaker in throwing; When circuit three loses power supply, tripping QF5 circuit breaker, QF2 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

B. circuit breaker Q F1, QF2, QF5 run; Standby throwing circuit breaker Q F4; When circuit one loses power supply, tripping QF1 circuit breaker, QF4 circuit breaker in throwing; When circuit three loses power supply, tripping QF5 circuit breaker, QF4 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

C. circuit breaker Q F1, QF2, QF4 run; Standby throwing circuit breaker Q F5; When circuit one loses power supply, tripping QF1 circuit breaker, QF5 circuit breaker in throwing; The logic algebra expression formula of its operational mode is:

D. circuit breaker Q F2, QF4, QF5 run; Standby throwing circuit breaker Q F1; When circuit three loses power supply, tripping QF5 circuit breaker, QF1 circuit breaker in throwing; The logic algebra expression formula of its operational mode is:

E. circuit breaker Q F1, QF2 run; Standby throwing circuit breaker Q F4, QF5; When circuit one loses power supply, tripping QF1 circuit breaker, QF4, QF5 circuit breaker in throwing; The logic algebra expression formula of its operational mode is: $\mathrm{AB}\stackrel{\‾}{\mathrm{DE}}.$

F. circuit breaker Q F4, QF5 run; Standby throwing circuit breaker Q F1, QF2; When circuit three loses power supply, tripping QF5 circuit breaker, QF1, QF2 circuit breaker in throwing; The logic algebra expression formula of its operational mode is:

G. circuit breaker Q F1, QF5 run; Standby throwing circuit breaker Q F2, QF4; When circuit one loses power supply, tripping QF1 circuit breaker, QF2, QF4 circuit breaker in throwing; When circuit three loses power supply, tripping QF5 circuit breaker, QF2, QF4 circuit breaker in throwing.The logic algebra expression formula of its operational mode is:

H. circuit breaker Q F1, QF4 run; Standby throwing circuit breaker Q F2, QF5; When circuit one loses power supply, tripping QF1 circuit breaker, QF2, QF5 circuit breaker in throwing; The logic algebra expression formula of its operational mode is: $A\stackrel{\‾}{B}D\stackrel{\‾}{E}.$

I. circuit breaker Q F2, QF5 run; Standby throwing circuit breaker Q F1, QF4; When circuit three loses power supply, tripping QF5 circuit breaker, QF1, QF4 circuit breaker in throwing; The logic algebra expression formula of its operational mode is: $\stackrel{\‾}{A}B\stackrel{\‾}{D}E.$

J. circuit breaker Q F1 runs; Standby throwing circuit breaker Q F2, QF4, QF5; When circuit one loses power supply, tripping QF1 circuit breaker, QF2, QF4, QF5 circuit breaker in throwing; The logic algebra expression formula of its operational mode is:

K. circuit breaker Q F5 runs; Standby throwing circuit breaker Q F1, QF2, QF4; When circuit three loses power supply, tripping QF5 circuit breaker, QF1, QF2, QF4 circuit breaker in throwing; The logic algebra expression formula of its operational mode is:

1. no matter No. one, No. two, No. three main transformers are for running or stopping using, but corresponding backup auto-activating device does not run, and is inactive mode.The logic algebra expression formula of its operational mode is:

The logic algebra expression formula obtaining expanded inter-bridge connection prepared auto restart operational mode thus satisfied is:

The theory analysis of the two internal bridge prepared auto restart of 2.2 simplification

When circuit one, circuit two, circuit three power supply all run, two internal bridge can be reduced to 2 internal bridges, these 2 wiring are in operation and form respective mini system mutually, supplying power for outside each other can be regarded as and not interfere with each other, two internal bridge prepared auto restart has been come by the first internal bridge prepared auto restart and the second internal bridge prepared auto restart, therefore, the prepared auto restart of these 2 wiring is equivalent in logical relation to the logical relation of "AND"; Two internal bridge is when circuit two or the maintenance of QF3 power failure of breaker, expanded inter-bridge connection is defined by circuit one and circuit three and QF1, QF2, QF4, QF5, therefore, two internal bridge is now expanded inter-bridge connection prepared auto restart logic, and the prepared auto restart logic of the common formation of expanded inter-bridge connection prepared auto restart logical AND first internal bridge prepared auto restart and the second internal bridge prepared auto restart should be the logical relation of "or" in logical relation; Therefore the two internal bridge prepared auto restart operational mode logic algebra expression formulas after simplification are had to be:

Computing also arranges (4) formula, and to consider between every two-way power supply that (namely between circuit one and circuit two power supply, between circuit two and circuit three power supply, between circuit one and circuit three power supply) can not paired running for a long time, namely circuit breaker Q F1, QF2, QF4, QF5 can not close simultaneously or circuit breaker Q F1, QF2, QF3 can not close simultaneously or circuit breaker Q F3, QF4, QF5 can not close simultaneously, consider simultaneously so (4) formula becomes:

$\begin{array}{c}\mathrm{AB}\stackrel{\‾}{C}D\stackrel{\‾}{E}+A\stackrel{\‾}{B}C\stackrel{\‾}{D}E+\stackrel{\‾}{A}\mathrm{BC}\stackrel{\‾}{D}E+A\stackrel{\‾}{B}\mathrm{CD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\mathrm{BCD}\stackrel{\‾}{E}+A\stackrel{\‾}{B}\stackrel{\‾}{C}\mathrm{DE}+\stackrel{\‾}{A}\stackrel{\‾}{B}C\stackrel{\‾}{D}E+A\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{D}E\\ +\stackrel{\‾}{A}\stackrel{\‾}{B}\mathrm{CD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\mathrm{DE}+\mathrm{AB}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}+A\stackrel{\‾}{B}C\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{A}\mathrm{BC}\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{D}E+\stackrel{\‾}{A}\stackrel{\‾}{B}C\stackrel{\‾}{\mathrm{DE}}+A\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}\\ +\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}+(\mathrm{AB}\stackrel{\‾}{C}D\stackrel{\‾}{E}+\stackrel{\‾}{A}B\stackrel{\‾}{C}\mathrm{DE}+A\stackrel{\‾}{B}\stackrel{\‾}{C}D\stackrel{\‾}{E}+\stackrel{\‾}{A}B\stackrel{\‾}{C}\stackrel{\‾}{D}E)\end{array}---\left(5\right)$

(5) in formula, the logic algebra expression formula of every 1 field represents 1 operational mode of two internal bridge prepared auto restart, logic algebra results in and has 21 fields, then represent that the two internal bridge prepared auto restarts simplified have 21 kinds of operational modes, in its bracket, 4 kinds of operational modes are that particular form is (see operational mode in table 14,5,16,17, operational mode 4 is equivalent to bridge prepared auto restart in second and stops using, operational mode 5 is equivalent to bridge prepared auto restart in first and stops using), uncommon at ordinary times.

2.3 operational modes compare

The table of comparisons 1, two internal bridge prepared auto restart operational modes of " exhaustive ", consistent with the logic algebra operational mode that results in, thus to demonstrate the operational mode of the two internal bridge prepared auto restarts after simplification with the listed operational mode of two internal bridge prepared auto restarts of " method of exhaustion " be identical, namely their operational effect is identical.And the logic algebra expression formula of provided by the invention pair of internal bridge prepared auto restart operational mode, simply clear, easy to understand, it is convenient to implement.

In order to reach the operational effect of better and safer, following technical measures need be taked: by above-mentioned analysis and the table of comparisons 1, when QF3 breaker thermal is for subsequent use, after the action of two interior bridge prepared auto restart is faced with action, selecting to go to allow the problem of which breaker closing actually.Two interior bridge prepared auto restart is when QF3 circuit breaker disconnects simultaneously, when first internal bridge prepared auto restart or the second internal bridge prepared auto restart are enabled, because prepared auto restart 1 action or prepared auto restart 2 action can cause two-way power ring network operation (operational mode 1 in such as table 1, operational mode 8 etc.) under some operational mode.For operational mode 1: when QF3 breaker thermal is for subsequent use, operational mode 1 is circuit breaker Q F1, QF2, QF5 run, standby throwing circuit breaker Q F3, QF4; When circuit three loses power supply, prepared auto restart 2 tripping QF5 circuit breaker, and QF3, QF4 circuit breaker that closes, now QF1, QF2, QF3 are then combined floodgate running status, and circuit one and circuit two power supply form loop-net operation.For preventing this indefinite action behavior and above-mentioned prepared auto restart stroke defect, require (no matter whether to overhaul) under QF3 circuit breaker disconnection, inactive first internal bridge prepared auto restart, the second internal bridge prepared auto restart, only enable expanded inter-bridge connection prepared auto restart.

The table of comparisons 1, QF3 circuit breaker run and also there is the first internal bridge prepared auto restart in circuit two dead electricity situation, situation (operational mode 2 in such as table 1, operational mode 3 etc.) that the simultaneously action of the second internal bridge prepared auto restart causes two-way power ring network operation.Run for operational mode 2: circuit breaker Q F1, QF3, QF5, standby throwing circuit breaker Q F2, QF4, when circuit two loses power supply, first internal bridge prepared auto restart tripping circuit breaker Q F3, circuit breaker Q F2 in throwing, the second internal bridge prepared auto restart tripping circuit breaker Q F3, circuit breaker Q F4 in throwing, then circuit breaker Q F1, QF2, QF4, QF5 are combined floodgate running status, and circuit one and circuit three power supply form loop-net operation.Therefore, in the case, mutual locking measure should be had between first internal bridge prepared auto restart, the second internal bridge prepared auto restart, the i.e. first internal bridge prepared auto restart action, answer the action of locking second internal bridge prepared auto restart, vice versa, and the time should be had differential in operate time, and operate time is differential was good between 0.5 ~ 1 second.

The present invention provides the prepared auto restart logic after two internal bridge prepared auto restart simplification, when concrete engineering is implemented, described first internal bridge prepared auto restart, the second internal bridge prepared auto restart, expanded inter-bridge connection prepared auto restart logic can adopt integrated 3 the prepared auto restart logics of backup auto-activating device to realize, also can realize with multiple backup auto-activating device combination, the backup auto-activating device used is electromagnetic type backup auto-activating device or microcomputer backup auto-activating device.

In addition to the implementation, the present invention can also have other execution modes, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection range of application claims.

Claims (7)

1. the method for simplifying of a two internal bridge prepared auto restart, described pair of internal bridge, there is three-way power inlet wire, be respectively circuit one, circuit two, circuit three, also comprise circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5, a main transformer, No. two main transformers, No. three main transformers, described circuit breaker Q F1, circuit breaker Q F3, circuit breaker Q F5 is respectively circuit one, circuit two, the incoming power circuit breaker of circuit three, described circuit breaker Q F2 is the bridge circuit breaker between circuit one and circuit two, circuit breaker Q F4 is the bridge circuit breaker between circuit two and circuit three, a described main transformer, No. two main transformers, No. three main transformers are respectively circuit one, circuit two, the main transformer of circuit three, at a main transformer, No. two main transformers, primary side or the power line trackside of No. three main transformers are connected to voltage transformer TV1 respectively, voltage transformer TV2, voltage transformer TV3,

It is characterized in that, two internal bridge prepared auto restart is reduced to and is made up of 2 internal bridge prepared auto restarts and 1 expanded inter-bridge connection prepared auto restart;

When circuit one, circuit two, circuit three power supply all run, prepared auto restart control logic is made up of the second internal bridge prepared auto restart of duplicate supply three circuit breakers that main the first internal bridge prepared auto restart master comprising duplicate supply three circuit breakers be made up of circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3 is made up of circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5 2 internal bridge prepared auto restarts;

When circuit one, circuit three power supply run, when circuit two power supply is out of service, prepared auto restart control logic is made up of expanded inter-bridge connection prepared auto restart logic, is namely made up of the expanded inter-bridge connection prepared auto restart of duplicate supply four circuit breaker circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F4, circuit breaker Q F5;

The logic algebra expression formula that described first internal bridge prepared auto restart operational mode meets is:

$A\stackrel{\‾}{B}C+\mathrm{AB}\stackrel{\‾}{C}+\stackrel{\‾}{A}\mathrm{BC}+A\stackrel{\‾}{B}\stackrel{\‾}{C}+\stackrel{\‾}{A}\stackrel{\‾}{B}C+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}$

The logic algebra expression formula that described second internal bridge prepared auto restart operational mode meets is:

$\mathrm{CD}\stackrel{\‾}{E}+C\stackrel{\‾}{D}E+\stackrel{\‾}{C}\mathrm{DE}+C\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{C}\stackrel{\‾}{D}E+\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}$

The logic algebra expression formula that described expanded inter-bridge connection prepared auto restart operational mode meets is:

$\begin{array}{c}A\stackrel{\‾}{B}\mathrm{DE}+\mathrm{ABD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\mathrm{BDE}+\mathrm{AB}\stackrel{\‾}{D}E+\stackrel{\‾}{A}\stackrel{\‾}{B}\mathrm{DE}+A\stackrel{\‾}{B}\stackrel{\‾}{D}E+\mathrm{AB}\stackrel{\‾}{\mathrm{DE}}+A\stackrel{\‾}{B}D\stackrel{\‾}{E}\\ +\stackrel{\‾}{A}B\stackrel{\‾}{D}E+A\stackrel{\‾}{B}\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{D}E+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{\mathrm{DE}}\end{array}$

Described first internal bridge prepared auto restart and the second internal bridge prepared auto restart logical relation are "AND"; The prepared auto restart logical relation that described expanded inter-bridge connection prepared auto restart and the first internal bridge prepared auto restart and the second internal bridge prepared auto restart are formed jointly is "or"; Two internal bridge prepared auto restart operational mode logic algebra expression formulas after simplification are:

$\begin{array}{c}(A\stackrel{\‾}{B}C+\mathrm{AB}\stackrel{\‾}{C}+\stackrel{\‾}{A}\mathrm{BC}+A\stackrel{\‾}{B}\stackrel{\‾}{C}+\stackrel{\‾}{A}\stackrel{\‾}{B}C+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C})*(\mathrm{CD}\stackrel{\‾}{E}+C\stackrel{\‾}{D}E+\stackrel{}{\stackrel{\‾}{C}}\mathrm{DE}+C\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{C}\stackrel{\‾}{D}E+\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}})\\ +(A\stackrel{\‾}{B}\mathrm{DE}+\mathrm{ABD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\mathrm{BDE}+\mathrm{AB}\stackrel{\‾}{D}E+\stackrel{\‾}{A}\stackrel{\‾}{B}\mathrm{DE}+A\stackrel{\‾}{\mathrm{BD}}E+\mathrm{AB}\stackrel{\‾}{\mathrm{DE}}+A\stackrel{\‾}{B}D\stackrel{\‾}{E}+\stackrel{\‾}{A}B\stackrel{\‾}{D}E+A\stackrel{\‾}{\mathrm{BDE}})\\ +\stackrel{\‾}{A}\stackrel{\‾}{\mathrm{BD}}E+\stackrel{\‾}{A}\stackrel{\‾}{\mathrm{BDE}})*\stackrel{\‾}{C}\end{array}$

Wherein, A, B, C, D, E represent that circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5 are combined floodgate running status respectively, are expressed as 1 by logic algebra; With represent that circuit breaker Q F1, circuit breaker Q F2, circuit breaker Q F3, circuit breaker Q F4, circuit breaker Q F5 are separating brake running status, are hot stand-by duty, are expressed as 0 by logic algebra respectively;

The further abbreviation of operational mode of two internal bridge prepared auto restart is:

$\begin{array}{c}\mathrm{AB}\stackrel{\‾}{C}D\stackrel{\‾}{E}+A\stackrel{\‾}{B}C\stackrel{\‾}{D}E+\stackrel{\‾}{A}\mathrm{BC}\stackrel{\‾}{D}E+A\stackrel{\‾}{B}\mathrm{CD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\mathrm{BCD}\stackrel{\‾}{E}+A\stackrel{\‾}{B}\stackrel{\‾}{C}\mathrm{DE}+\stackrel{\‾}{A}\stackrel{\‾}{B}C\stackrel{\‾}{D}E+A\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{D}E\\ +\stackrel{\‾}{A}\stackrel{\‾}{B}\mathrm{CD}\stackrel{\‾}{E}+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\mathrm{DE}+\mathrm{AB}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}+A\stackrel{}{B}C\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{A}\mathrm{BC}\stackrel{\‾}{\mathrm{DE}}+\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{D}E+\stackrel{\‾}{A}\stackrel{\‾}{B}C\stackrel{\‾}{\mathrm{DE}}+A\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}\\ +\stackrel{\‾}{A}\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{\‾}{\mathrm{DE}}+(\mathrm{AB}\stackrel{\‾}{C}D\stackrel{\‾}{E}+\stackrel{\‾}{A}B\stackrel{\‾}{C}\mathrm{DE}+A\stackrel{\‾}{B}\stackrel{\‾}{C}\stackrel{}{}D\stackrel{\‾}{E}+\stackrel{\‾}{A}B\stackrel{\‾}{C}\stackrel{\‾}{D}E)\end{array}$

1 operational mode of the two internal bridge prepared auto restart of logic algebra expression formula representative of every 1 field in above formula, totally 21 kinds of operational modes.

2. the method for simplifying of two internal bridge prepared auto restart as claimed in claim 1, it is characterized in that, during described circuit two power loss, mutual locking between the first internal bridge prepared auto restart and the second internal bridge prepared auto restart, operate time is differential if having time.

3. the method for simplifying of two internal bridge prepared auto restart as claimed in claim 2, it is characterized in that, described operate time is differential between 0.5 ~ 1 second.

4. the method for simplifying of two internal bridge prepared auto restart as claimed in claim 1, is characterized in that, when under circuit breaker Q F3 disconnection, stop using the first internal bridge prepared auto restart, the second internal bridge prepared auto restart, only enable expanded inter-bridge connection prepared auto restart.

5. the method for simplifying of two internal bridge prepared auto restart as claimed in claim 1, it is characterized in that, described first internal bridge prepared auto restart, the second internal bridge prepared auto restart, expanded inter-bridge connection prepared auto restart are electromagnetic type backup auto-activating device or microcomputer backup auto-activating device.

6. the method for simplifying of two internal bridge prepared auto restart as claimed in claim 1, it is characterized in that, described first internal bridge prepared auto restart, the second internal bridge prepared auto restart, expanded inter-bridge connection prepared auto restart logic are realized by integrated 3 the prepared auto restart logics of PLC backup auto-activating device.

7. the method for simplifying of two internal bridge prepared auto restart as claimed in claim 1, it is characterized in that, described first internal bridge prepared auto restart, the second internal bridge prepared auto restart, expanded inter-bridge connection prepared auto restart logic are realized by integrated 3 the prepared auto restart logics of microcomputer backup auto-activating device.