CN115792435A

CN115792435A - Method for verifying qualification of protective electrical appliance of direct current system of transformer substation

Info

Publication number: CN115792435A
Application number: CN202211426770.3A
Authority: CN
Inventors: 刘湘莅; 吴烜玮; 宋晓帆; 陈晨; 薛文杰; 董平先; 郭放; 张亮; 殷毅; 周正; 白萍萍; 宋景博; 齐桓若
Original assignee: Economic and Technological Research Institute of State Grid Henan Electric Power Co Ltd
Current assignee: Economic and Technological Research Institute of State Grid Henan Electric Power Co Ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-03-14

Abstract

The invention relates to a method for verifying the qualification of a protective electric appliance of a direct current system of a transformer substation, which comprises the following steps: the method comprises the steps that protective electric appliances of each level of a direct-current system of a transformer substation are represented by logic connection wires and numbered, the qualification of the protective electric appliances is checked from a load side to a first level of a storage battery side, the short-circuit current of the first level and the short-circuit current of the lower level of the protective electric appliances of each level and relevant parameters of the protective electric appliances are collected, and then the following qualification is checked; checking the qualification of the load side protection electrical appliance S4; checking the qualification of the protective electrical appliance S3 at the side of the direct current distribution cabinet; checking the qualification of the protective electrical appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet; checking the qualification of the fuse F1 at the outlet of the storage battery; summarizing the results of the step S2-S5 of checking the qualification of the protective electrical appliances at all levels, providing a checking conclusion and giving a modification suggestion; the invention has the advantages of providing a feasible test scheme and a criterion method, providing technical reference and standard reference, and having good social benefit and economic benefit.

Description

Method for verifying qualification of protective electrical appliance of direct current system of transformer substation

Technical Field

The invention belongs to the technical field of transformer substation design and operation and maintenance, and particularly relates to a transformer substation direct current system protection electric appliance qualification verification method.

Background

The direct current feeder is used as an important component in a direct current power supply system, and the type selection and the level difference of a direct current breaker are matched to be widely concerned in the recent years of rapid development of a power grid; in the existing direct current technology, for example, two different configurations of a direct current main feeder cabinet feed-out circuit breaker and a branch electric cabinet feed-out circuit breaker are compared through engineering example calculation on the model selection of a direct current system miniature circuit breaker in a conventional transformer substation, and a three-section circuit breaker is matched with a lower-level two-section circuit breaker, so that the selectivity can be naturally realized, and the good level difference matching characteristic is realized; or after further analysis and comparison of new and old versions of technical rules for designing the direct current system of the power engineering, rectification measures are given for the type selection and the level difference matching of the direct current circuit breaker of the transformer substation, different scheme analysis of the configuration of the three-level and four-level direct current circuit breakers is elaborated, a three-section type protection direct current circuit breaker is recommended to be adopted, in consideration of the safety and reliability of the transformer substation, the direct current circuit breaker with a short delay current quick-break protection function tends to be adopted, after several power grid accidents caused by the faults of a branch system of the transformer substation continuously occur in China, the network design of the direct current system of the transformer substation is optimized and researched, the typical configuration scheme of the direct current system is provided for different arrangement forms of the transformer substation, and key problems such as the level difference matching of the two-level direct current circuit breakers, the three-level direct current circuit breakers and the four-level miniature direct current circuit breakers are elaborated; however, the related technologies for checking the protection electric appliance of the direct current system are few, so far, accidents caused by the fault of the direct current system due to the fact that the direct current protection electric appliance is not paid attention to and careless managed are still many, the situations of skip, slow skip or burning of the protection electric appliance are still many, the safe operation of electric power facilities is seriously influenced, particularly, the direct current power supply system is used as the basis of control and protection, the stability of the operation of a power grid is directly related, and the reliability of the direct current power supply system plays an important role in the power grid; therefore, it is necessary to provide a method for verifying the qualification of the protective electric appliance of the direct current system of the transformer substation, which provides a feasible test scheme and a criterion method, provides technical reference and standard reference, and has good social benefit and economic benefit.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a method for verifying the qualification of the protective electric appliance of the direct current system of the transformer substation, which provides a feasible test scheme and a judgment method, provides technical reference and standard reference, and has good social benefit and economic benefit.

The purpose of the invention is realized as follows: a transformer substation direct current system protection electric appliance qualification verification method comprises the following steps:

step 1: the method comprises the steps that protective electric appliances of each level of a direct-current system of a transformer substation are represented by logic connection wires and numbered, the qualification of the protective electric appliances is checked from a load side to a first level of a storage battery side, the short-circuit current of the first level and the short-circuit current of the lower level of the protective electric appliances of each level and relevant parameters of the protective electric appliances are collected, and then the following qualification is checked;

step 2: checking the qualification of the load side protection electrical appliance S4;

and step 3: checking the qualification of the direct-current distribution cabinet side protection electric appliance S3;

and 4, step 4: checking the qualification of the protective electrical appliance S2 from the direct current feed cabinet to the direct current distribution cabinet;

and 5: checking the qualification of the fuse F1 at the outlet of the storage battery;

and 6, summarizing the results of the qualification verification of the protective electrical appliances at all levels in the steps 2-5, providing a verification conclusion and giving modification suggestions.

The qualification verification of the load side protection electrical appliance S4 in the step 2 specifically comprises the following steps: the criterion whether the load side protection electrical appliance S4 is qualified is as follows: IF (AND (. Beta.)) ₁ *β ₃ * InS4 is less than or equal to Id6, icu (S4) 1000 is more than or equal to Id 6), and qualified), wherein beta ₁ The sensitivity coefficient of S4 instantaneous tripping is obtained; beta is a ₃ The maximum value of the S4 instantaneous tripping range; inS4 is rated current of the S4 breaker; id6 is short-circuit current at a point d6 at the outlet of the S4 breaker; icu (S4) is rated short circuit breaking current of the S4 circuit breaker; id6 is the maximum short circuit current through the breaker S4.

The qualification verification algorithm of the load side protection electric appliance S4 in the step 2 is explained and based on: according to the 'short-circuit instantaneous protection is short-circuited according to the outlet of the circuit breaker of the level, the instantaneous protection of a release of the circuit breaker is reliably set, and the rated short-circuit breaking current of the circuit breaker is larger than the short-circuit current passing through the circuit breaker'; wherein beta is ₁ The default value is 1.05, and the user can redefine according to the requirement; beta is a ₁ 、β ₃ The numerical value is stored in a database, the numerical value can be automatically called in the database when a user selects a standard characteristic circuit breaker, and the numerical value can be input by the user when the user selects a non-standard characteristic circuit breaker; when beta is not satisfied ₁ *β ₃ * When InS4 is less than or equal to Id6 criterion, the verification conclusion shows that 'the S4 breaker does not meet the condition that the reliable instantaneous tripping current value is less than or equal to the current Id6 of the outlet short circuit of the circuit breaker at the current level after considering the sensitivity coefficient, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short circuited'; correction suggestionAnd displaying that the rated current value of the S4 breaker is reduced or the S4 breaker with a reasonable tripping range is selected.

The load side protection electrical appliance S4 qualification verification algorithm in the step 2 is explained and is based on: when the criterion of Icu (S4) × 1000 ≧ Id6 is not satisfied, the check conclusion shows that 'S4 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id6 passing through breaker S4'; the rectification advice display "S4 selects a breaker with a rated short circuit breaking current greater than the maximum short circuit current through the breaker".

The qualification verification of the direct-current distribution cabinet side protection electric appliance S3 in the step 3 specifically comprises the following steps: the criterion whether the direct current distribution cabinet protective electrical appliance S3 is qualified or not is as follows: 1) When the S3 adopts a three-section breaker: IF (AND (beta) ₅ *InS3＜Id5,Id6＜β ₄ ,β ₆ *β ₇ Id4, icu (S3) 1000 > Id4, icw (S3) 1000 > Id4, and "pass"), wherein β ₅ The maximum value of the short-delay tripping range of S3 is obtained; inS3 is rated current of the S3 breaker; id5 is the terminal short-circuit current of the line of the current level; id6 is outlet short-circuit current of the lower-stage circuit breaker; beta is a beta ₄ Is the minimum value of the S3 instantaneous tripping range; beta is a ₆ The sensitivity coefficient of S3 instantaneous tripping is obtained; beta is a ₇ The maximum value of the instantaneous tripping range; id4 is the outlet short-circuit current of the S3 breaker; icu (S3) is rated short circuit breaking current of the S3 circuit breaker; icw (S3) is the short-time withstand current of the S3 breaker; algorithm interpretation and basis: according to the short circuit instantaneous protection, the instantaneous protection of a circuit breaker release is reliably set according to the short circuit of the outlet of the circuit breaker at the stage, when the tail end of the circuit at the stage is short-circuited, the circuit breaker can reliably act, when the outlet of the circuit breaker at the next stage is short-circuited, the instantaneous action beyond the stage is not required, the matching requirement of the stage difference is met, the rated short circuit breaking current of the circuit breaker is required to be larger than the short circuit current passing through the circuit breaker, and the circuit breaker with the short-time tolerance current larger than the maximum short circuit current passing through the circuit breaker is required to be selected; when beta is not satisfied ₅ * When InS3 is less than Id5 criterion, the check conclusion shows that the S3 breaker does not meet the condition that the short-circuit short-delay reliable action current value is less than the tail end short-circuit current Id5 of the line, and the tail end of the line at the current level can only depend on overload long-delay action when in short circuit; correction suggestion display S3 circuit breaker selected rated current and reasonable action characteristicAnd a breaker with short circuit short time delay protection, when Id6 is not satisfied, beta is less than ₄ When the circuit breaker is judged to be in a standard, a check conclusion shows that the S3 circuit breaker does not meet the current value of reliable instant action > the outlet short-circuit current Id6 of the next-stage circuit breaker, can perform the step-by-step instant action when the outlet of the next-stage circuit breaker is in short circuit, and does not meet the step difference matching requirement; the rectification suggestion display 'S3 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₆ *β ₇ When the Id4 criterion is not more than or equal to, the verification conclusion shows that the reliable instantaneous tripping current value of the S3 breaker after considering the sensitivity coefficient is not more than or equal to the outlet short-circuit current Id4 of the circuit breaker of the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker of the current level is short-circuited; the rectification suggestion displays 'select the S3 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S3) × 1000 > Id4 is not satisfied, the verification conclusion shows that 'the S3 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id4 passing through the breaker S3'; the rectification suggestion shows 'S3 selects a breaker with rated short-circuit breaking current larger than the maximum short-circuit current passing through the breaker'; when the criterion of Icw (S3) 1000 > Id4 is not satisfied, the check conclusion shows that 'S3 breaker does not satisfy short-time withstand current > maximum short-circuit current Id4 passing through breaker S3'; the rectification advice shows "S3 selects a breaker with a short-time withstand current greater than the maximum short-circuit current through the breaker".

The qualification verification of the direct-current distribution cabinet side protection electric appliance S3 in the step 3 specifically comprises the following steps: the criterion whether the direct current distribution cabinet protective electrical appliance S3 is qualified or not is as follows: 2) When the two-stage breaker is adopted in S3: IF (AND (beta) ₆ *β ₇ ＜Id5,Id6＜β ₄ ,β ₆ *β ₇ Id4, icu (S3) × 1000 > Id 4), "pass"), wherein β ₆ The sensitivity coefficient of the instantaneous trip is S3; beta is a ₇ The maximum value of the instantaneous tripping range of S3; id5 is the terminal short-circuit current of the line of the current level; id6 is outlet short-circuit current of the lower-level circuit breaker; beta is a beta ₄ Is the minimum value of the S3 instantaneous tripping range; id4 is the outlet short-circuit current of the S3 breaker; icu (S3) is rated short circuit breaking current of the S3 circuit breaker; algorithm interpretation and basis: according to the' short circuit instantaneous protection is according to the outlet short circuit of the circuit breaker of the level, the reliable action setting of the instantaneous protection of the tripper of the circuit breaker,"when this stage of line end short circuit, the circuit breaker should be able to reliably act", "when next stage of circuit breaker outlet short circuit should not override instantaneous action, meet level difference fit requirement", "circuit breaker rated short circuit breaking current should be greater than short circuit current passing through circuit breaker"; when beta is not satisfied ₆ *β ₇ If the current value is less than the Id5 criterion, a check conclusion shows that the reliable instantaneous tripping current value of the S3 circuit after the sensitivity coefficient is not considered is less than or equal to the terminal short-circuit current Id5 of the current-stage line, and the terminal of the current-stage line can only depend on overload long-delay action when the terminal of the current-stage line is short-circuited; the rectification suggestion shows that the S3 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id6 < beta is not satisfied ₄ When the circuit breaker is judged to be in a standard, a verification conclusion shows that the S3 circuit breaker does not meet the requirement of reliable instant action of current value > Id6 of outlet short circuit of the next-stage circuit breaker, and can perform instant action beyond the level and not meet the level difference matching requirement when the outlet short circuit of the next-stage circuit breaker is performed; the rectification suggestion display 'S3 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₆ *β ₇ When the criterion Id4 is smaller than or equal to the criterion Id4, a check conclusion shows that the reliable instantaneous tripping current value of the S3 breaker after considering the sensitivity coefficient is not larger than or equal to the current Id4 of the outlet short circuit of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short circuited; the rectification suggestion displays 'select the S3 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S3) × 1000 > Id4 is not satisfied, the check conclusion shows that 'S3 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id4 passing through the breaker S3'; the rectification advice display "S3 selects a breaker with a rated short-circuit breaking current greater than the maximum short-circuit current through the breaker".

The step 4 of verifying the qualification of the protective electrical appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet specifically comprises the following steps: criterion whether the electric appliance S2 from the direct current feed cabinet to the direct current distribution cabinet is qualified or not: 1) When S2 adopts a three-section breaker: IF (AND (beta) ₉ *InS2＜Id3,Id4＜β ₈ *InS2,β ₁₀ *β ₁₁ * InS2 is less than or equal to Id2, icu (S2) 1000 > Id2, icw (S2) 1000 > Id 2), and qualified, wherein beta ₉ The maximum value of the short-delay tripping range of S2; inS2 is rated power of S2 circuit breakerA stream; id3 is the terminal short-circuit current of the line of the current level; id4 is outlet short-circuit current of the lower-stage circuit breaker; beta is a ₈ Is the minimum value of S2 instantaneous tripping range; inS2 is rated current of the S2 breaker; beta is a beta ₁₀ The sensitivity coefficient of S2 instantaneous tripping; beta is a ₁₁ The maximum value of the instantaneous tripping range; inS2 is rated current of the S2 breaker; id2 is the outlet short-circuit current of the S2 breaker; icu (S2) is the rated short circuit breaking current of the S2 breaker; icw (S2) is the short-time withstand current of the S2 breaker; algorithm interpretation and basis: according to the principle that when the tail end of a circuit of the current stage is short-circuited, a circuit breaker can reliably act, when the outlet of a next-stage circuit breaker is short-circuited, transient action beyond the stage is not required, the matching requirement of the stage difference is met, short-circuit transient protection is set according to the outlet short-circuit of the circuit breaker of the current stage, transient protection of a circuit breaker release is reliably acted, rated short-circuit breaking current of the circuit breaker is larger than short-circuit current passing through the circuit breaker, and a circuit breaker with short-time tolerance current larger than the maximum short-circuit current passing through the circuit breaker is selected; when beta is not satisfied ₉ * When InS2 is less than Id3 criterion, the check conclusion shows that the S2 breaker can not meet the short-circuit short-delay reliable action current value less than the tail end short-circuit current Id3 of the line, and only can depend on overload long-delay action when the tail end of the line is short-circuited; the rectification suggestion shows that the S2 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id4 < beta is not satisfied ₈ * When InS2 is used as a criterion, a check conclusion shows that the S2 breaker cannot meet the requirements of reliable instantaneous action current value > the outlet short-circuit current Id4 of the next-stage breaker, and can possibly carry out grading instantaneous action and cannot meet the matching requirement of grade difference when the outlet short-circuit of the next-stage breaker is carried out; the rectification suggestion display 'S2 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id2 criterion, the check conclusion shows that the reliable instantaneous tripping current value of the S2 breaker does not meet the requirement of considering sensitivity coefficient is less than or equal to the outlet short-circuit current Id2 of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short-circuited; the rectification suggestion displays 'select the S2 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that the S2 breaker does not satisfy rated short circuit breakingCurrent > maximum short circuit current Id2 "through breaker S2; the rectification suggestion display 'S2 selects a breaker with rated short-circuit breaking current larger than the maximum short-circuit current passing through the breaker'; when the criterion of Icw (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that 'S2 breaker does not satisfy short-time withstand current > maximum short-circuit current Id2 passing through the breaker S2'; the rectification advice shows "S2 selects a breaker with a short-time withstand current greater than the maximum short-circuit current through the breaker".

The step 4 of checking the qualification of the protective electric appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet specifically comprises the following steps: criterion whether the electric appliance S2 from the direct current feed cabinet to the direct current distribution cabinet is qualified or not: 2) When the two-stage breaker is adopted in S2: IF (AND (beta) ₁₀ *β ₁₁ *InS2≤Id3,Id4＜β8*InS2,β ₁₀ *β ₁₁ * InS2 is less than or equal to Id2, icu (S2) × 1000 > Id 2), and qualified), wherein beta ₁₀ The sensitivity coefficient of S2 instantaneous tripping; beta is a ₁₁ Is the maximum value of the S2 instantaneous tripping range; inS2 is rated current of the S2 breaker; id3 is the terminal short-circuit current of the line of the current level; id4 is outlet short-circuit current of the lower-stage circuit breaker; beta is a ₈ Is the minimum value of S2 instantaneous tripping range; id2 is the outlet short-circuit current of the S2 breaker; icu (S2) is rated short circuit breaking current of the S2 circuit breaker; algorithm interpretation and basis: "when this stage of line end short circuit, the circuit breaker should be able to reliably act", "when next stage of circuit breaker outlet short circuit should not exceed the stage instantaneous action, meet the stage difference coordination requirement", "short circuit instantaneous protection is according to this stage of circuit breaker outlet short circuit, circuit breaker release instantaneous protection reliable action is set", "circuit breaker rated short circuit breaking current should be greater than the short circuit current through the circuit breaker"; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id3 criterion, the check conclusion shows that the S2 breaker can not meet the reliable instantaneous tripping current value after considering sensitive coefficient and is less than or equal to the tail end short-circuit current Id3 of the current-stage line, and only can rely on overload long-delay action when the tail end of the current-stage line is short-circuited; the rectification suggestion shows that the S2 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id4 < beta is not satisfied ₈ * When InS2 is judged as the criterion, the verification conclusion shows that the current value of the S2 breaker which can not meet the reliable instant non-action is larger than the next current valueThe outlet short-circuit current Id4 of the level breaker can instantaneously act beyond the level when the outlet of the next level breaker is short-circuited, and the level difference matching requirement is not met; the rectification suggestion shows that S2 selects a breaker with reasonable parameters and short-circuit short-delay protection; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id2 criterion, the check conclusion shows that the reliable instantaneous tripping current value of the S2 breaker does not meet the requirement of considering sensitivity coefficient is less than or equal to the outlet short-circuit current Id2 of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short-circuited; the rectification suggestion displays 'select the S2 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that 'the S2 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id2 passing through the breaker S2'; correction suggestion display 'S2 selection of circuit breaker with rated short-circuit breaking current greater than maximum short-circuit current passing through circuit breaker'

The qualification verification of the storage battery outlet fuse F1 in the step 5 specifically comprises the following steps: criterion for judging whether the storage battery outlet fuse F1 is qualified or not: IF (AND (InF 1 is more than 2 × InS2, inF1 is more than or equal to I1, icu (F1) is more than 1000 × Id 1), "qualified"), wherein InF1 is rated current of the F1 fuse; inS2 is rated current of the S2 breaker; i1 is the discharge rate current of the storage battery for 1h or 2 h; icu (F1) is rated short circuit breaking current of the F1 fuse; id1 is the maximum short circuit current through the F1 fuse; algorithm interpretation and basis: the fuse does not instantaneously act beyond the grade when the outlet of the next-stage circuit breaker is in short circuit, so that the requirement of grade difference fit is met, the fuse at the outlet of the storage battery meets the rated current (A) which is more than or equal to the discharge rate current of the storage battery for 1 hour, and the rated short-circuit breaking current of the fuse is more than the short-circuit current passing through the fuse; when the criterion InF1 > 2 is not met, the checking conclusion shows that the F1 fuse does not meet rated current > 2 times of the maximum value of the rated current of the direct current bus feeder circuit breaker S2, and the F1 fuse can possibly perform override action; the correction suggestion shows "increase F1 fuse rated current or decrease S2 breaker rated current"; when the InF1 is not satisfied with the I1 or more criterion, the verification conclusion shows that 'the F1 fuse does not satisfy the rated current of not less than 1 hour of discharge rate current of the storage battery'; the correction suggestion shows "increase F1 fuse rated current"; when the criterion of Icu (F1) × 1000 > Id1 is not satisfied, the verification conclusion shows that 'the F1 fuse does not satisfy the rated short-circuit breaking current > the maximum short-circuit current Id1 passing through the F1 fuse'; the correction advice shows "F1 selects a fuse with a rated short-circuit breaking current larger than the maximum short-circuit current through the fuse".

The invention has the beneficial effects that: the invention is a transformer substation direct current system protective electrical apparatus qualification verification method, the traditional method usually only measures and calculates the capacity of the accumulator, the cable cross section of the accumulator, the short-circuit current to the calculation verification aspect of the direct current system, does not verify the qualification of the protective electrical apparatus of the direct current system at all levels, but the invention realizes the iterative verification calculation of the protective electrical apparatus parameter on all loops of the direct current system of the transformer substation by establishing the direct current system protective electrical apparatus qualification verification analysis mathematical model and the criterion scheme, obtains the verification result, gives out the modification suggestion at the same time, can propose the feasible test scheme and criterion method to the DC system protective electrical apparatus qualification verification, provide the technical reference and the standard reference to the subsequent check acceptance of the DC system, have good social benefit and economic benefit; the method can be applied to provincial inspection and various municipal transportation and inspection in carrying out inspection and acceptance, operation and maintenance inspection, professional inspection and example inspection and transportation and inspection of various transformer substation direct current systems, provides technical support for key points which influence the direct current safe operation of the transformer substation, such as key control of direct current open grading configuration, direct current supply network counter measure implementation and the like, strengthens the operation and maintenance management of the direct current system for the station, ensures the operation safety of the direct current system for the station and promotes the direct current transportation and inspection of a power supply company; the invention has the advantages of providing a feasible test scheme and a criterion method, providing technical reference and standard reference, and having good social benefit and economic benefit.

Drawings

Fig. 1 is a configuration diagram of a dc system protection electrical appliance of a method for verifying the eligibility of the dc system protection electrical appliance of a substation according to the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Example 1

As shown in fig. 1, a method for verifying the qualification of a substation dc system protection appliance includes the following steps:

step 1: the method comprises the steps that protective electric appliances of each level of a direct-current system of a transformer substation are represented and numbered by logic connection wires, the qualification check of the protective electric appliances is carried out from a load side to a storage battery side, the short-circuit current of the upper level and the lower level of the protective electric appliances of each level and the related parameters of the protective electric appliances are collected firstly, and then the qualification check is carried out;

and step 3: checking the qualification of the protective electrical appliance S3 at the side of the direct current distribution cabinet;

and 4, step 4: checking the qualification of the protective electrical appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet;

and 6, summarizing the qualification verification results of the protective electric appliances at all levels in the steps S2-S5, proposing a verification conclusion and giving a modification suggestion.

The invention is a transformer substation direct current system protective electrical apparatus qualification verification method, the traditional method usually only measures and calculates the capacity of the accumulator, the cable cross section of the accumulator, the short-circuit current to the calculation verification aspect of the direct current system, does not verify the qualification of the protective electrical apparatus of the direct current system at all levels, but the invention realizes the iterative verification calculation of the protective electrical apparatus parameter on all loops of the direct current system of the transformer substation by establishing the direct current system protective electrical apparatus qualification verification analysis mathematical model and the criterion scheme, obtains the verification result, gives out the modification suggestion at the same time, can propose the feasible test scheme and criterion method to the DC system protective electrical apparatus qualification verification, provide the technical reference and the standard reference to the subsequent check acceptance of the DC system, have good social benefit and economic benefit; the method can be applied to provincial inspection and various municipal transportation and inspection in carrying out inspection and acceptance, operation and maintenance inspection, professional inspection and example inspection and operation inspection of each transformer substation direct current system, provides technical support for key points which influence the direct current safe operation of the transformer substation, such as key points of 'direct current air switch hierarchical configuration', 'direct current power supply network counter measure implementation', and the like, strengthens the operation and maintenance management of the direct current system for the station, ensures the safe operation of the direct current system for the station, and promotes the direct current operation and inspection of a power supply company; the invention has the advantages of providing a feasible test scheme and a criterion method, providing technical reference and standard reference, and having good social benefit and economic benefit.

Example 2

As shown in fig. 1, a method for verifying the eligibility of a protection appliance of a dc system of a substation includes the following steps:

The qualification verification of the load side protection electric appliance S4 in the step 2 specifically comprises the following steps: the criterion whether the load side protection electrical appliance S4 is qualified is as follows: IF (AND (beta) ₁ *β ₃ * InS4 is not more than Id6, icu (S4) > 1000 is not less than Id 6), and qualified), wherein beta ₁ S4, the sensitivity coefficient of instantaneous tripping is obtained; beta is a ₃ The maximum value of the S4 instantaneous tripping range (rated current multiple); inS4 is rated current of the S4 breaker; id6 is short-circuit current at a point d6 of an outlet of the S4 breaker; icu (S4) is the rated short circuit breaking current (kA) of the S4 circuit breaker; id6 is the maximum short circuit current through the breaker S4.

The qualification verification algorithm of the load side protection electric appliance S4 in the step 2 is explained and based on: according to' short-circuit instantaneous protection, according to the short circuit of the outlet of the circuit breaker of the current stage, the tripping device of the circuit breaker is instantaneousReliable action setting of protection, wherein rated short-circuit breaking current of the breaker is larger than short-circuit current passing through the breaker; wherein, beta ₁ The default value is 1.05, and the user can redefine the default value according to the requirement; beta is a beta ₁ 、β ₃ The numerical value is stored in a database, the numerical value can be automatically called in the database when a user selects a standard characteristic circuit breaker, and the numerical value can be input by the user when the user selects a non-standard characteristic circuit breaker; when beta is not satisfied ₁ *β ₃ * When InS4 is less than or equal to Id6 criterion, the verification conclusion shows that 'the S4 breaker does not meet the condition that the reliable instantaneous tripping current value is less than or equal to the current Id6 of the outlet short circuit of the circuit breaker at the current level after considering the sensitivity coefficient, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short circuited'; the rectification suggestion shows 'reduce the rated current value of the S4 breaker, or select the S4 breaker with reasonable tripping range'.

The qualification verification algorithm of the load side protection electric appliance S4 in the step 2 is explained and based on: when the criterion of Icu (S4) × 1000 ≧ Id6 is not satisfied, the verification conclusion shows that 'S4 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id6 passing through breaker S4'; the rectification advice display "S4 selects a breaker with a rated short-circuit breaking current greater than the maximum short-circuit current through the breaker".

In this embodiment, when a plurality of S4 with different rated currents exist in the load cubicle, S4 may be designed to be S4max (S4 breaker with maximum rated current in cubicle) and S4min (S4 breaker with minimum rated current in cubicle), which is convenient for checking all the air switches by checking the maximum air switch and the minimum air switch of the same load cubicle; the verification criteria of S4max and S4min are the same as S4.

The qualification verification of the direct-current distribution cabinet side protection electric appliance S3 in the step 3 specifically comprises the following steps: the criterion whether the direct current distribution cabinet protective electrical appliance S3 is qualified or not is as follows: 1) When the three-section breaker is adopted in S3: IF (AND (beta) ₅ *InS3＜Id5,Id6＜β ₄ ,β ₆ *β ₇ Id4, icu (S3) 1000 Id4, icw (S3) 1000 Id4, pass), wherein β ₅ The maximum value (rated current multiple) of the short-delay tripping range of S3; inS3 is rated current of the S3 breaker; id5 is the terminal short-circuit current of the line of the current level; id6 is outlet short-circuit current of the lower-level circuit breaker; beta is a ₄ Is the minimum value of S3 instantaneous tripping range; beta is a ₆ The sensitivity coefficient of S3 instantaneous tripping is obtained; beta is a ₇ Is the maximum value of the instantaneous tripping range; id4 is the outlet short-circuit current of the S3 breaker; icu (S3) is the rated short circuit breaking current (kA) of the S3 circuit breaker; icw (S3) is short-time withstand current (kA) of the S3 breaker; algorithm interpretation and basis: according to the short circuit instantaneous protection, the instantaneous protection of a circuit breaker release is reliably set according to the short circuit of the outlet of the circuit breaker at the stage, when the tail end of the circuit at the stage is short-circuited, the circuit breaker can reliably act, when the outlet of the circuit breaker at the next stage is short-circuited, the instantaneous action beyond the stage is not required, the matching requirement of the stage difference is met, the rated short circuit breaking current of the circuit breaker is required to be larger than the short circuit current passing through the circuit breaker, and the circuit breaker with the short-time tolerance current larger than the maximum short circuit current passing through the circuit breaker is required to be selected; when beta is not satisfied ₅ * When InS3 is less than Id5 criterion, the check conclusion shows that the S3 breaker does not meet the condition that the short-circuit short-delay reliable action current value is less than the tail end short-circuit current Id5 of the line, and the tail end of the line at the current level can only depend on overload long-delay action when in short circuit; the correction suggestion shows that 'the S3 breaker selects the breaker with reasonable rated current and action characteristic and short-circuit short-delay protection' when the Id6 is not satisfied and the beta is not more than ₄ When the circuit breaker is judged to be in a standard, a check conclusion shows that the S3 circuit breaker does not meet the current value of reliable instant action > the outlet short-circuit current Id6 of the next-stage circuit breaker, can perform the step-by-step instant action when the outlet of the next-stage circuit breaker is in short circuit, and does not meet the step difference matching requirement; the rectification suggestion shows that S3 selects a breaker with reasonable parameters and short-circuit short-delay protection; when beta is not satisfied ₆ *β ₇ When the criterion Id4 is smaller than or equal to the criterion Id4, a check conclusion shows that the reliable instantaneous tripping current value of the S3 breaker after considering the sensitivity coefficient is not larger than or equal to the current Id4 of the outlet short circuit of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short circuited; the rectification suggestion displays 'select the S3 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S3) × 1000 > Id4 is not satisfied, the check conclusion shows that 'S3 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id4 passing through the breaker S3'; the rectification suggestion shows 'S3 selects a breaker with rated short-circuit breaking current larger than the maximum short-circuit current passing through the breaker'; when in useWhen the criterion of Icw (S3) 1000 & Id4 is not met, the verification conclusion shows that the S3 breaker does not meet the short-time withstand current & gt the maximum short-circuit current Id4 passing through the breaker S3; the rectification advice shows "S3 selects a breaker with a short-time withstand current greater than the maximum short-circuit current through the breaker".

The qualification verification of the direct-current distribution cabinet side protection electric appliance S3 in the step 3 specifically comprises the following steps: the criterion whether the direct current distribution cabinet protective electrical appliance S3 is qualified or not is as follows: 2) When the two-stage breaker is adopted in S3: IF (AND (beta) ₆ *β ₇ ＜Id5,Id6＜β ₄ ,β ₆ *β ₇ Id4, icu (S3) × 1000 > Id 4), "pass"), wherein β ₆ The sensitivity coefficient of the instantaneous trip is S3; beta is a ₇ The maximum value of the instantaneous tripping range of S3; id5 is the terminal short-circuit current of the line of the current level; id6 is outlet short-circuit current of the lower-stage circuit breaker; beta is a beta ₄ Is the minimum value of the S3 instantaneous tripping range; id4 is the outlet short-circuit current of the S3 breaker; icu (S3) is the rated short circuit breaking current (kA) of the S3 circuit breaker; algorithm interpretation and basis: according to the short circuit instantaneous protection, the instantaneous protection of a circuit breaker release is set reliably according to the short circuit of the outlet of the circuit breaker at the stage, when the tail end of the circuit at the stage is short-circuited, the circuit breaker can reliably act, when the outlet of the circuit breaker at the next stage is short-circuited, the instantaneous action beyond the stage is not required, the matching requirement of the stage difference is met, and the rated short circuit breaking current of the circuit breaker is larger than the short circuit current passing through the circuit breaker; when beta is not satisfied ₆ *β ₇ When the criterion is less than Id5, the verification conclusion shows that the S3 breaker can not meet the requirement of reliable instantaneous tripping current value after considering sensitive coefficient and is less than or equal to the tail end short-circuit current Id5 of the line, and the tail end of the line can only depend on overload long-delay action when short-circuited; the rectification suggestion shows that the S3 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id6 < beta is not satisfied ₄ When the circuit breaker is judged to be in a standard, a check conclusion shows that the S3 circuit breaker does not meet the current value of reliable instant action > the outlet short-circuit current Id6 of the next-stage circuit breaker, can perform the step-by-step instant action when the outlet of the next-stage circuit breaker is in short circuit, and does not meet the step difference matching requirement; the rectification suggestion display 'S3 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₆ *β ₇ When the criterion Id4 is smaller than or equal to the criterion Id4, a check conclusion shows that the reliable instantaneous tripping current value of the S3 breaker after considering the sensitivity coefficient is not larger than or equal to the current Id4 of the outlet short circuit of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short circuited; the rectification suggestion shows 'select the S3 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S3) × 1000 > Id4 is not satisfied, the check conclusion shows that 'S3 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id4 passing through the breaker S3'; the rectification advice display "S3 selects a breaker with a rated short circuit breaking current greater than the maximum short circuit current through the breaker".

The step 4 of verifying the qualification of the protective electrical appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet specifically comprises the following steps: criterion whether the electric appliance S2 from the direct current feed cabinet to the direct current distribution cabinet is qualified or not: 1) When S2 adopts a three-section breaker: IF (AND (. Beta.)) ₉ *InS2＜Id3,Id4＜β ₈ *InS2,β ₁₀ *β ₁₁ * InS2 is less than or equal to Id2, icu (S2) 1000 > Id2, icw (S2) 1000 > Id 2), and qualified, wherein beta ₉ The maximum value of the S2 short delay tripping range (rated current multiple); inS2 is rated current of the S2 breaker; id3 is the terminal short-circuit current of the current-stage line; id4 is outlet short-circuit current of the lower-stage circuit breaker; beta is a beta ₈ Is the minimum value (rated current multiple) of the S2 instantaneous tripping range; inS2 is rated current of the S2 breaker; beta is a beta ₁₀ The sensitivity coefficient of S2 instantaneous tripping; beta is a beta ₁₁ The maximum value of the instantaneous tripping range (rated current multiple); inS2 is rated current of the S2 breaker; id2 is the outlet short-circuit current of the S2 breaker; icu (S2) is the rated short circuit breaking current (kA) of the S2 circuit breaker; icw (S2) is the short-time withstand current (kA) of the S2 breaker; algorithm interpretation and basis: according to the principle that when the tail end of a circuit of the current stage is short-circuited, a circuit breaker can reliably act, when the outlet of a next-stage circuit breaker is short-circuited, transient action beyond the stage is not required, the matching requirement of the stage difference is met, short-circuit transient protection is set according to the outlet short-circuit of the circuit breaker of the current stage, transient protection of a circuit breaker release is reliably acted, rated short-circuit breaking current of the circuit breaker is larger than short-circuit current passing through the circuit breaker, and a circuit breaker with short-time tolerance current larger than the maximum short-circuit current passing through the circuit breaker is selected; when beta is not satisfied ₉ *IWhen nS2 is less than Id3 criterion, the check conclusion shows that the S2 breaker can not meet the short-circuit short-delay reliable action current value less than the tail end short-circuit current Id3 of the line, and only can depend on overload long-delay action when the tail end of the line is short-circuited; the rectification suggestion shows that the S2 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id4 < beta is not satisfied ₈ * When InS2 is used as a criterion, a check conclusion shows that the S2 breaker cannot meet the current value of reliable instantaneous action > the outlet short-circuit current Id4 of the next-stage breaker, and can possibly perform the step-by-step instantaneous action and not meet the step matching requirement when the outlet of the next-stage breaker is short-circuited; the rectification suggestion display 'S2 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id2 criterion, the check conclusion shows that the reliable instantaneous tripping current value of the S2 breaker does not meet the requirement of considering sensitivity coefficient is less than or equal to the outlet short-circuit current Id2 of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short-circuited; the rectification suggestion displays 'select the S2 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that 'the S2 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id2 passing through the breaker S2'; the rectification suggestion display 'S2 selects a breaker with rated short-circuit breaking current larger than the maximum short-circuit current passing through the breaker'; when the criterion of Icw (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that 'S2 breaker does not satisfy short-time withstand current > maximum short-circuit current Id2 passing through the breaker S2'; the rectification advice shows "S2 selects a breaker with a short-time withstand current greater than the maximum short-circuit current through the breaker".

The step 4 of verifying the qualification of the protective electrical appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet specifically comprises the following steps: the criterion whether the electric appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet is qualified or not is as follows: 2) When the two-stage breaker is adopted in S2: IF (AND (beta) ₁₀ *β ₁₁ *InS2≤Id3,Id4＜β ₈ *InS2,β ₁₀ *β ₁₁ * InS2 is less than or equal to Id2, icu (S2) × 1000 > Id 2), and qualified), wherein beta ₁₀ The sensitivity coefficient of S2 instantaneous tripping is obtained; beta is a ₁₁ Is S2 instantaneous tripping range maximum (rated power)A stream multiple); inS2 is rated current of the S2 breaker; id3 is the terminal short-circuit current of the line of the current level; id4 is outlet short-circuit current of the lower-stage circuit breaker; beta is a ₈ Is the minimum value (rated current multiple) of the S2 instantaneous tripping range; id2 is the outlet short-circuit current of the S2 breaker; icu (S2) is the rated short circuit breaking current (kA) of the S2 circuit breaker; algorithm interpretation and basis: "when this stage of line end short circuit, the circuit breaker should be able to reliably act", "when next stage of circuit breaker outlet short circuit should not exceed the stage instantaneous action, meet the stage difference coordination requirement", "short circuit instantaneous protection is according to this stage of circuit breaker outlet short circuit, circuit breaker release instantaneous protection reliable action is set", "circuit breaker rated short circuit breaking current should be greater than the short circuit current through the circuit breaker"; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id3 criterion, the verification conclusion shows that 'the S2 breaker does not meet the condition that the reliable instantaneous tripping current value is less than or equal to the tail end short-circuit current Id3 of the current stage after considering the sensitivity coefficient, and the tail end of the current stage is short-circuited and only depends on overload long delay action'; the rectification suggestion shows that the S2 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id4 < beta is not satisfied ₈ * When InS2 is used as a criterion, a check conclusion shows that the S2 breaker cannot meet the current value of reliable instantaneous action > the outlet short-circuit current Id4 of the next-stage breaker, and can possibly perform the step-by-step instantaneous action and not meet the step matching requirement when the outlet of the next-stage breaker is short-circuited; the rectification suggestion display 'S2 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id2 criterion, the check conclusion shows that the reliable instantaneous tripping current value of the S2 breaker does not meet the requirement of considering sensitivity coefficient is less than or equal to the outlet short-circuit current Id2 of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short-circuited; the rectification suggestion shows 'select S2 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S2) × 1000 > Id2 is not satisfied, the check conclusion shows that 'S2 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id2 passing through the breaker S2'; the rectification advice display "S2 selects a breaker with a rated short-circuit breaking current greater than the maximum short-circuit current through the breaker".

The qualification verification of the storage battery outlet fuse F1 in the step 5 specifically comprises the following steps: criterion for judging whether the storage battery outlet fuse F1 is qualified or not: IF (AND (InF 1 > 2 InS2, inF1 is more than or equal to I1, icu (F1) 1000 > Id 1), AND qualified), wherein InF1 is rated current of the F1 fuse; inS2 is rated current of the S2 breaker; i1 is the discharge rate current of the storage battery for 1h or 2 h; icu (F1) is rated short circuit breaking current (kA) of the F1 fuse; id1 is the maximum short circuit current through the F1 fuse; algorithm interpretation and basis: the fuse does not instantaneously act beyond the grade when the outlet of the next-stage breaker is short-circuited, and meets the matching requirement of grade difference, the fuse at the outlet of the storage battery meets the requirement that the rated current (A) is more than or equal to the discharge rate current of the storage battery for 1 hour, and the rated short-circuit breaking current of the fuse is more than the short-circuit current passing through the fuse; when the InF1 & gt 2 InS2 criterion is not met, the verification conclusion shows that the F1 fuse does not meet rated current & gt 2 times of the maximum value of the rated current of the direct current bus feeder circuit breaker S2, and the F1 fuse can possibly perform override action; the correction suggestion shows "increase F1 fuse rated current or decrease S2 breaker rated current"; when the InF1 is not satisfied with the I1 or more criterion, the verification conclusion shows that 'the F1 fuse does not satisfy the rated current of not less than 1 hour of discharge rate current of the storage battery'; the rectification suggestion shows "increase F1 fuse rated current"; when the criterion of Icu (F1) × 1000 > Id1 is not satisfied, the verification conclusion shows that 'the F1 fuse does not satisfy rated short-circuit breaking current > maximum short-circuit current Id1 passing through the F1 fuse'; the correction advice shows "F1 selects a fuse with a rated short-circuit breaking current larger than the maximum short-circuit current through the fuse".

The invention is a transformer substation direct current system protection electrical apparatus qualification verification method, the traditional method usually only measures and calculates the capacity of the storage battery, the cable cross section of the storage battery, short-circuit current to the calculation verification aspect of the direct current system, does not verify the qualification of the protection electrical apparatus of all levels of the direct current system, but the invention realizes the iterative verification calculation of the protection electrical apparatus parameter on all loops of the direct current system of the transformer substation by establishing the direct current system protection electrical apparatus qualification verification analysis mathematical model and criterion scheme, obtains the verification result, gives out the modification suggestion at the same time, can propose the feasible test scheme and criterion method to the qualification verification of the direct current system protection electrical apparatus, provide the technical reference and the standard reference to the follow-up direct current system acceptance, have good social benefit and economic benefit; the method can be applied to provincial inspection and various municipal transportation and inspection in carrying out inspection and acceptance, operation and maintenance inspection, professional inspection and example inspection and transportation and inspection of various transformer substation direct current systems, provides technical support for key points which influence the direct current safe operation of the transformer substation, such as key control of direct current open grading configuration, direct current supply network counter measure implementation and the like, strengthens the operation and maintenance management of the direct current system for the station, ensures the operation safety of the direct current system for the station and promotes the direct current transportation and inspection of a power supply company; the invention has the advantages of providing a feasible test scheme and a criterion method, providing technical reference and standard reference, and having good social benefit and economic benefit.

Claims

1. A transformer substation direct current system protection electric appliance qualification verification method is characterized by comprising the following steps: the method comprises the following steps:

and 3, step 3: checking the qualification of the direct-current distribution cabinet side protection electric appliance S3;

and 6, summarizing the qualification verification results of the protective electric appliances at all levels in the steps 2-5, proposing a verification conclusion and giving a modification suggestion.

2. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system, according to claim 1, is characterized in that: the step 2 of checking the qualification of the load side protection electrical appliance S4 specifically comprises: the criterion whether the load side protection electrical appliance S4 is qualified is as follows: IF (AND (beta) ₁ *β ₃ * InS4 is less than or equal to Id6, icu (S4) 1000 is more than or equal to Id 6), and qualified), wherein beta ₁ S4, the sensitivity coefficient of instantaneous tripping is obtained; beta is a ₃ Is the maximum value of the S4 instantaneous tripping range; inS4 is rated current of the S4 breaker; id6 is short-circuit current at a point d6 of an outlet of the S4 breaker; icu (S4) is rated short circuit breaking current of the S4 breaker; id6 is the maximum short circuit current through the breaker S4.

3. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system, according to claim 2, is characterized in that: the load side protection electrical appliance S4 qualification verification algorithm in the step 2 is explained and is based on: according to the short circuit instantaneous protection, the instantaneous protection of a circuit breaker release is set reliably according to the short circuit of the outlet of the circuit breaker of the current stage, and the rated short circuit breaking current of the circuit breaker is larger than the short circuit current passing through the circuit breaker; wherein beta is ₁ The default value is 1.05, and the user can redefine the default value according to the requirement; beta is a ₁ 、β ₃ The numerical value is stored in a database, the numerical value can be automatically called in the database when a user selects a standard characteristic circuit breaker, and the numerical value can be input by the user when the user selects a non-standard characteristic circuit breaker; when beta is not satisfied ₁ *β ₃ * When InS4 is less than or equal to Id6 criterion, the verification conclusion shows that 'the S4 breaker does not meet the condition that the reliable instantaneous tripping current value is less than or equal to the current Id6 of the outlet short circuit of the circuit breaker at the current level after considering the sensitivity coefficient, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short circuited'; the rectification suggestion shows 'reduce the rated current value of the S4 breaker, or select the S4 breaker with reasonable tripping range'.

4. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system, according to claim 3, is characterized in that: the load side protection electrical appliance S4 qualification verification algorithm in the step 2 is explained and is based on: when the criterion of Icu (S4) × 1000 ≧ Id6 is not satisfied, the check conclusion shows that 'S4 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id6 passing through breaker S4'; the rectification advice display "S4 selects a breaker with a rated short-circuit breaking current greater than the maximum short-circuit current through the breaker".

5. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system, according to claim 1, is characterized in that: the qualification verification of the direct-current distribution cabinet side protection electric appliance S3 in the step 3 specifically comprises the following steps: the criterion whether the direct current distribution cabinet protective electrical appliance S3 is qualified or not is as follows: 1) When the three-section breaker is adopted in S3: IF (AND (. Beta.)) ₅ *InS3＜Id5,Id6＜β ₄ ,β ₆ *β ₇ Id4, icu (S3) 1000 > Id4, icw (S3) 1000 > Id4, and "pass"), wherein β ₅ The maximum value of the short-delay tripping range of S3 is obtained; inS3 is rated current of the S3 breaker; id5 is the terminal short-circuit current of the current-stage line; id6 is outlet short-circuit current of the lower-level circuit breaker; beta is a beta ₄ Is the minimum value of the S3 instantaneous tripping range; beta is a beta ₆ The sensitivity coefficient of S3 instantaneous tripping is obtained; beta is a ₇ The maximum value of the instantaneous tripping range; id4 is the outlet short-circuit current of the S3 breaker; icu (S3) is rated short circuit breaking current of the S3 circuit breaker; icw (S3) is the short-time withstand current of the S3 breaker; algorithm interpretation and basis: according to the short circuit instantaneous protection, the instantaneous protection of a circuit breaker release is reliably set according to the short circuit of the outlet of the circuit breaker at the stage, when the tail end of the circuit at the stage is short-circuited, the circuit breaker can reliably act, when the outlet of the circuit breaker at the next stage is short-circuited, the instantaneous action beyond the stage is not required, the matching requirement of the stage difference is met, the rated short circuit breaking current of the circuit breaker is required to be larger than the short circuit current passing through the circuit breaker, and the circuit breaker with the short-time tolerance current larger than the maximum short circuit current passing through the circuit breaker is required to be selected; when beta is not satisfied ₅ * When InS3 is less than Id5 criterion, the check conclusion shows that the S3 breaker can not meet the short-circuit short-delay reliable action current value less than the tail end short-circuit current Id5 of the line, and only can depend on overload long-delay action when the tail end of the line is short-circuited; the rectification suggestion shows that 'S3 breaker selects the breaker with reasonable rated current and operating characteristic and short-circuit short-delay protection' when Id6 is not satisfied, beta is more than ₄ When the circuit breaker is judged to be in a standard, a check conclusion shows that the S3 circuit breaker does not meet the current value of reliable instant action > the outlet short-circuit current Id6 of the next-stage circuit breaker, can perform the step-by-step instant action when the outlet of the next-stage circuit breaker is in short circuit, and does not meet the step difference matching requirement; finishing machineThe reconstruction shows that 'S3 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₆ *β ₇ When the Id4 criterion is not more than or equal to, the verification conclusion shows that the reliable instantaneous tripping current value of the S3 breaker after considering the sensitivity coefficient is not more than or equal to the outlet short-circuit current Id4 of the circuit breaker of the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker of the current level is short-circuited; the rectification suggestion shows 'select the S3 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S3) × 1000 > Id4 is not satisfied, the check conclusion shows that 'S3 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id4 passing through the breaker S3'; the rectification suggestion shows 'S3 selects a breaker with rated short-circuit breaking current larger than the maximum short-circuit current passing through the breaker'; when the criterion of Icw (S3) 1000 > Id4 is not satisfied, the check conclusion shows that 'S3 breaker does not satisfy short-time withstand current > maximum short-circuit current Id4 passing through breaker S3'; the rectification advice shows "S3 selects a breaker with a short-time withstand current greater than the maximum short-circuit current through the breaker".

6. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system, according to claim 5, is characterized in that: the qualification verification of the direct-current distribution cabinet side protection electric appliance S3 in the step 3 specifically comprises the following steps: the criterion whether the direct current distribution cabinet protective electrical appliance S3 is qualified or not is as follows: 2) When the two-stage breaker is adopted in S3: IF (AND (beta) ₆ *β ₇ ＜Id5,Id6＜β ₄ ,β ₆ *β ₇ Id4, icu (S3) × 1000 > Id 4), "pass"), where β ₆ The sensitivity coefficient of S3 instantaneous tripping is obtained; beta is a ₇ The maximum value of the instantaneous tripping range of S3; id5 is the terminal short-circuit current of the line of the current level; id6 is outlet short-circuit current of the lower-level circuit breaker; beta is a ₄ Is the minimum value of S3 instantaneous tripping range; id4 is the outlet short-circuit current of the S3 breaker; icu (S3) is rated short circuit breaking current of the S3 circuit breaker; algorithm interpretation and basis: according to the short circuit instantaneous protection, the instantaneous protection reliable action of a circuit breaker release is set according to the short circuit of the circuit breaker outlet of the current stage, the circuit breaker can reliably act when the tail end of the circuit of the current stage is short circuited, and the step difference matching is met because the step-by-step instantaneous action is not required when the circuit breaker outlet of the next stage is short circuitedThe requirement that the rated short-circuit breaking current of the breaker should be larger than the short-circuit current passing through the breaker; when beta is not satisfied ₆ *β ₇ If the current value is less than the Id5 criterion, a check conclusion shows that the reliable instantaneous tripping current value of the S3 circuit after the sensitivity coefficient is not considered is less than or equal to the terminal short-circuit current Id5 of the current-stage line, and the terminal of the current-stage line can only depend on overload long-delay action when the terminal of the current-stage line is short-circuited; the rectification suggestion shows that the S3 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id6 < beta is not satisfied ₄ When the circuit breaker is judged to be in a standard, a check conclusion shows that the S3 circuit breaker does not meet the current value of reliable instant action > the outlet short-circuit current Id6 of the next-stage circuit breaker, can perform the step-by-step instant action when the outlet of the next-stage circuit breaker is in short circuit, and does not meet the step difference matching requirement; the rectification suggestion shows that S3 selects a breaker with reasonable parameters and short-circuit short-delay protection; when beta is not satisfied ₆ *β ₇ When the Id4 criterion is not more than or equal to, the verification conclusion shows that the reliable instantaneous tripping current value of the S3 breaker after considering the sensitivity coefficient is not more than or equal to the outlet short-circuit current Id4 of the circuit breaker of the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker of the current level is short-circuited; the rectification suggestion displays 'select the S3 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S3) × 1000 > Id4 is not satisfied, the check conclusion shows that 'S3 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id4 passing through the breaker S3'; the rectification advice display "S3 selects a breaker with a rated short-circuit breaking current greater than the maximum short-circuit current through the breaker".

7. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system, according to claim 1, is characterized in that: the step 4 of verifying the qualification of the protective electrical appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet specifically comprises the following steps: the criterion whether the electric appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet is qualified or not is as follows: 1) When the S2 adopts a three-section breaker: IF (AND (. Beta.)) ₉ *InS2＜Id3,Id4＜β ₈ *InS2,β ₁₀ *β ₁₁ * InS2 is less than or equal to Id2, icu (S2) 1000 > Id2, icw (S2) 1000 > Id 2), and qualified, wherein beta ₉ Is the maximum value of the S2 short delay tripping range; inS2 is S2 circuit breakerRated current; id3 is the terminal short-circuit current of the current-stage line; id4 is outlet short-circuit current of the lower-stage circuit breaker; beta is a ₈ Is the minimum value of S2 instantaneous tripping range; inS2 is rated current of the S2 breaker; beta is a ₁₀ The sensitivity coefficient of S2 instantaneous tripping is obtained; beta is a beta ₁₁ Is the maximum value of the instantaneous tripping range; inS2 is rated current of the S2 breaker; id2 is the outlet short-circuit current of the S2 breaker; icu (S2) is rated short circuit breaking current of the S2 circuit breaker; icw (S2) is short-time withstand current of the S2 breaker; algorithm interpretation and basis: according to the principle that when the tail end of a circuit of the current stage is short-circuited, a circuit breaker can reliably act, when the outlet of a next-stage circuit breaker is short-circuited, transient action beyond the stage is not required, the matching requirement of the stage difference is met, short-circuit transient protection is set according to the outlet short-circuit of the circuit breaker of the current stage, transient protection of a circuit breaker release is reliably acted, rated short-circuit breaking current of the circuit breaker is larger than short-circuit current passing through the circuit breaker, and a circuit breaker with short-time tolerance current larger than the maximum short-circuit current passing through the circuit breaker is selected; when beta is not satisfied ₉ * When InS2 is less than Id3 criterion, the check conclusion shows that the S2 breaker can not meet the short-circuit short-delay reliable action current value less than the tail end short-circuit current Id3 of the line, and only can depend on overload long-delay action when the tail end of the line is short-circuited; the rectification suggestion shows that the S2 breaker selects a breaker with reasonable rated current and action characteristic and short-circuit short-delay protection; when Id4 < beta is not satisfied ₈ * When InS2 is used as a criterion, a check conclusion shows that the S2 breaker cannot meet the current value of reliable instantaneous action > the outlet short-circuit current Id4 of the next-stage breaker, and can possibly perform the step-by-step instantaneous action and not meet the step matching requirement when the outlet of the next-stage breaker is short-circuited; the rectification suggestion shows that S2 selects a breaker with reasonable parameters and short-circuit short-delay protection; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id2 criterion, the check conclusion shows that the reliable instantaneous tripping current value of the S2 breaker does not meet the requirement of considering sensitivity coefficient is less than or equal to the outlet short-circuit current Id2 of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short-circuited; the rectification suggestion displays 'select the S2 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that' the S2 breaker does not satisfy the rated short circuitThe circuit breaking current > the maximum short-circuit current Id2 through the breaker S2 "; the rectification suggestion display 'S2 selects a breaker with rated short-circuit breaking current larger than the maximum short-circuit current passing through the breaker'; when the criterion of Icw (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that 'S2 breaker does not satisfy short-time withstand current > maximum short-circuit current Id2 passing through the breaker S2'; the rectification advice shows "S2 selects a breaker with a short-time withstand current greater than the maximum short-circuit current through the breaker".

8. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system as claimed in claim 6, wherein the method comprises the following steps: the step 4 of verifying the qualification of the protective electrical appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet specifically comprises the following steps: the criterion whether the electric appliance S2 from the direct-current feed cabinet to the direct-current distribution cabinet is qualified or not is as follows: 2) When S2 adopts a two-section breaker: IF (AND (beta) ₁₀ *β ₁₁ *InS2≤Id3,Id4＜β ₈ *InS2,β ₁₀ *β ₁₁ * InS2 is less than or equal to Id2, icu (S2) × 1000 > Id 2), and qualified), wherein beta ₁₀ The sensitivity coefficient of S2 instantaneous tripping; beta is a ₁₁ Is the maximum value of the S2 instantaneous tripping range; inS2 is rated current of the S2 breaker; id3 is the terminal short-circuit current of the line of the current level; id4 is outlet short-circuit current of the lower-stage circuit breaker; beta is a beta ₈ Is the minimum value of S2 instantaneous tripping range; id2 is the outlet short-circuit current of the S2 breaker; icu (S2) is the rated short circuit breaking current of the S2 breaker; algorithm interpretation and basis: "when this stage of circuit tail end short circuit, the circuit breaker should be able to reliably act", "when the next stage circuit breaker outlet short circuit should not step beyond the instantaneous action, satisfy the level difference fit requirement", "short circuit instantaneous protection is according to this stage circuit breaker outlet short circuit, the circuit breaker release instantaneous protection reliably acts and sets", "the rated short circuit breaking current of the circuit breaker should be greater than the short circuit current through the circuit breaker"; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id3 criterion, the check conclusion shows that the S2 breaker can not meet the reliable instantaneous tripping current value after considering sensitive coefficient and is less than or equal to the tail end short-circuit current Id3 of the current-stage line, and only can rely on overload long-delay action when the tail end of the current-stage line is short-circuited; the modification suggestion shows that the S2 breaker selects the rated current and the operation characteristic is reasonable,Circuit breakers with short circuit short delay protection; when Id4 < beta is not satisfied ₈ * When InS2 is used as a criterion, a check conclusion shows that the S2 breaker cannot meet the current value of reliable instantaneous action > the outlet short-circuit current Id4 of the next-stage breaker, and can possibly perform the step-by-step instantaneous action and not meet the step matching requirement when the outlet of the next-stage breaker is short-circuited; the rectification suggestion display 'S2 selects a breaker with reasonable parameters and short-circuit short-delay protection'; when beta is not satisfied ₁₀ *β ₁₁ * When InS2 is less than or equal to Id2 criterion, the check conclusion shows that the reliable instantaneous tripping current value of the S2 breaker does not meet the requirement of considering sensitivity coefficient is less than or equal to the outlet short-circuit current Id2 of the circuit breaker at the current level, and the instantaneous protection can not reliably act when the outlet of the circuit breaker at the current level is short-circuited; the rectification suggestion displays 'select the S2 breaker with reasonable instantaneous tripping range'; when the criterion of Icu (S2) × 1000 > Id2 is not satisfied, the verification conclusion shows that 'the S2 breaker does not satisfy rated short-circuit breaking current > maximum short-circuit current Id2 passing through the breaker S2'; the rectification advice display "S2 selects a breaker with a rated short-circuit breaking current greater than the maximum short-circuit current through the breaker".

9. The method for verifying the qualification of the protective electrical appliance of the substation direct-current system, according to claim 1, is characterized in that: the qualification verification of the storage battery outlet fuse F1 in the step 5 specifically comprises the following steps: the criterion whether the storage battery outlet fuse F1 is qualified is as follows: IF (AND (InF 1 is more than 2 × InS2, inF1 is more than or equal to I1, icu (F1) is more than 1000 × Id 1), "qualified"), wherein InF1 is rated current of the F1 fuse; inS2 is rated current of the S2 breaker; i1 is the discharge rate current of the storage battery for 1h or 2 h; icu (F1) is rated short circuit breaking current of the F1 fuse; id1 is the maximum short circuit current through the F1 fuse; algorithm interpretation and basis: the fuse does not instantaneously act beyond the grade when the outlet of the next-stage breaker is short-circuited, and meets the matching requirement of grade difference, the fuse at the outlet of the storage battery meets the requirement that the rated current (A) is more than or equal to the discharge rate current of the storage battery for 1 hour, and the rated short-circuit breaking current of the fuse is more than the short-circuit current passing through the fuse; when the criterion InF1 > 2 is not met, the checking conclusion shows that the F1 fuse does not meet rated current > 2 times of the maximum value of the rated current of the direct current bus feeder circuit breaker S2, and the F1 fuse can possibly perform override action; the correction suggestion shows "increase F1 fuse rated current or decrease S2 breaker rated current"; when the InF1 is not satisfied and is not less than the I1 criterion, the check conclusion shows that the F1 fuse does not satisfy the rated current and is not less than the discharge rate current of the storage battery for 1 hour; the correction suggestion shows "increase F1 fuse rated current"; when the criterion of Icu (F1) × 1000 > Id1 is not satisfied, the verification conclusion shows that 'the F1 fuse does not satisfy rated short-circuit breaking current > maximum short-circuit current Id1 passing through the F1 fuse'; the correction advice shows "F1 selects a fuse with a rated short-circuit breaking current larger than the maximum short-circuit current through the fuse".