CN104142448A - Method for automatically checking protection functions of microcomputer main-transformer differential protection device - Google Patents
Method for automatically checking protection functions of microcomputer main-transformer differential protection device Download PDFInfo
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Abstract
The invention discloses a method for automatically checking the protection functions of a microcomputer main-transformer differential protection device. The method includes the steps of starting a checking mode, shutting external alternating current sampling, reading a protection control word and a protection control definite value, starting to test an item of a test, judging whether protection is input or not, shutting other protection functions, generating a test sequence according to the definite value, carrying out alternating current input assignment, judging whether the protection acts or not, recording action values and action evaluation, releasing protection function shutting, judging whether the test is completed or not, generating a function checking report, printing the function checking report, exiting from the checking mode, starting external alternating current sampling and the like. By means of the method, extra hardware cost and extra outside loop wiring are not needed, testing of the various protection functions of the whole device can be completed without manual intervention and protection for a tester, the testing process and the testing result are dynamically displayed in real time, and the test report is automatically generated. Due to the automatic checking technology, device test items are standardized, and technical errors, such as test item missing, testing method mistaking and testing result misjudgment, caused by the capacity of workers are avoided.
Description
Technical field
The invention belongs to relay protection of power system and technical field of automatic control, particularly relate to a kind of defencive function automatic Verification method of microcomputer type main transformer differential protective device.
Background technology
Main transformer differential protection is element protection very important in electric system, to ensureing that power network safety operation plays an important role.Microcomputer type main transformer differential protection is at present widely used in 35kV～500kV main transformer protection field.The microcomputer type main transformer differential protection overwhelming majority adopts the malfunction when preventing external area error of ratio brake principles, and application harmonic braking principle or waveform symmetry algorithm are realized anti-excitation surge current.Because the downside CT of main transformer senior middle school no-load voltage ratio is different, rated current is different; each side mode of connection of main transformer is different simultaneously; therefore when calculating difference current, need to carry out angular setting and coefficient of balance conversion; ratio brake curve generally adopts syllogic broken line simultaneously; stalling current is chosen formula and is also not quite similar, and these have all caused between ratio brake formula differential protection active region verification to calculate loaded down with trivial details, complicated operation, length consuming time, easily make mistakes etc.
External circuit energising simulated failure is generally taked at present main transformer differential defencive function verification, changes gradually input current operation of recording value, calculates the method that difference current and stalling current are drawn trip boundary curve more afterwards according to working value.But on-the-spot function check need to be by protection tester, and test wiring is complicated, and needs again to calculate action difference current and stalling current after drawing test result, directly perceived not to the judgement of equipment energy characteristic.These are all that putting into operation of main transformer differential protective device debugged examination and regular maintenance verifying work has brought difficulty.
Along with power grid construction is fast-developing and the widespread use of Microcomputer Protection equipment, and due to the importance of main transformer element, main transformer protection generally adopts dual configuration, and microcomputer type main transformer differential protects number of devices significantly to increase, and repair and maintenance workload is day by day heavy.Personnel's growth rate does not far catch up with the growth rate of equipment, has caused check work deficiency of time, and UC level and pilot project standardization are poor, even occurs leaking the phenomenon of verification or mistake verification, has caused the potential safety hazard of Operation of Electric Systems.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of defencive function automatic Verification method of microcomputer type main transformer differential protective device.
In order to achieve the above object, the defencive function automatic Verification method of microcomputer type main transformer differential protective device provided by the invention comprises the following step of carrying out in order:
Step 1) start the S01 stage of checking mode: by the man-machine interface menu on main transformer differential protective device, enter checking mode;
Step 2) the S02 stage of locking external communication sampling: after checking mode, program automatically completes and exchanges input switching, the input of locking external communication, the interchange that automatic test module is produced input passes to protection module;
Step 3) the S03 stage of fetch protection control word and definite value: reading device protection definite value, control word setting and outside intake state, the hard pressing plate of fetch protection control word and external function is thrown the state that moves back automatically;
Step 4) enter the S04 stage of a test: the defencive function sequence that device is possessed, order is carried out each defencive function test;
Step 5) the S05 stage that whether judgement protection drops into: according to the control word reading and pressing plate state, the protection type that definite needs are tested, if this protection control word and defencive function pressing plate are all input state, enter next step S06 stage, otherwise next step reenters the S04 stage;
Step 6) the S06 stage of other defencive functions of locking: will, except test event other defencive function lockings of other places, avoid other protection actions to impact test result;
Step 7) according to definite value, generate the S07 stage of cycle tests: read the test template of this protection, according to defencive function verification project and the protection definite value reading, generate defencive function cycle tests;
Step 8) exchange the S08 stage of input quantity assignment: according to cycle tests, alternating current, magnitude of voltage are assigned to built-in variable; Start to automatically perform testing scheme after test, the interchange input quantity in simulated failure situation is delivered to the logic module of protection CPU, thus simulated failure situation;
Step 9) the S09 stage that whether judgement protection moves: according to the startup situation of the action situation of protection CPU and startup CPU, whether judgement protection moves, if judgment result is that "Yes", enters next step S10 stage; Otherwise next step reenters the S08 stage;
Step 10) the S10 stage of operation of recording value and action evaluation: after protection CPU and startup CPU move simultaneously, finish single test, and carry out again twice same test, same function is carried out to 3 tests; Input value and the actuation time of the each action of record, according to above result, this defencive function is evaluated;
Step 11) the S11 stage of de-preservation function locking a: defencive function is removed the locking of other protections after having tested;
Step 12) the S12 stage that whether judgement test completes: judge whether this protection is last, if judgment result is that "Yes", enters next step S13 stage, test finishes; Otherwise next step reenters the S04 stage, proceed the test of the next item down defencive function;
Step 13) the S13 stage of systematic function verification report: according to test result, load the template completion function check report prelisting;
Step 14) the S14 stage of printed report: printing function verification report;
Step 15) exit the S15 stage of checking mode: after reporting printing completes, automatically exit checking mode;
Step 16) open the S16 stage of external communication sampling: open external communication sampling, recovery and protection device normal operating conditions;
Step 17) complete: this automatic Verification flow process so far finishes.
At S07, in the stage, the generation method of described defencive function cycle tests is: according to the principle of respective type protection, work out, excessive protection is progressively increased to 1.2 times of definite values since 0, for the amount of owing, protection is progressively decreased to 0.8 times of definite value from normal condition; Comprising three kinds of protection types: differential protection function, secondary harmonic brake and overcurrent protection.
The implementation result of the defencive function automatic Verification method of microcomputer type main transformer differential protective device provided by the invention: do not need extra hardware spending and external loop wiring; do not need manual intervention and protection tester can complete the test of the every defencive function of package unit; Real time dynamic display test process and result, and automatically generate test report.This automatic Verification technical manual equipment test project; avoided the check causing due to peopleware to leak the technology mistakes such as item, method of inspection mistake, assay erroneous judgement; can improve main transformer protection function check work efficiency; eliminate main transformer protection equipment safety hidden danger, be conducive to lifting means safety operation level.
Accompanying drawing explanation
Fig. 1 is the hardware module arrangement plan of the defencive function automatic Verification method implementing platform of microcomputer type main transformer differential protective device provided by the invention.
Fig. 2 is the fundamental diagram of the defencive function automatic Verification method of microcomputer type main transformer differential protective device provided by the invention.
Fig. 3 is the process flow diagram of the defencive function automatic Verification method of microcomputer type main transformer differential protective device provided by the invention.
Fig. 4 is typical ratios formula differential protection operating space schematic diagram.
Fig. 5 is that high-pressure side is each side current diagram of 3 winding transformers of internal bridge.
Embodiment
Below in conjunction with the drawings and specific embodiments, the defencive function automatic Verification method of microcomputer type main transformer differential protective device provided by the invention is elaborated.
The present invention utilizes the hardware resource of existing protective device common configuration, does not need additionally to increase hardware, and adopt, adds the independently method practical function verification of test procedure; Its hardware coordinates logic as shown in Figure 1; Do not need external loop analog input to carry out simulated failure, and adopt device software to set the method for simulated failure, as shown in Figure 2 simultaneously; The precision checking of device sampling section should adopt the methods such as protection tester to carry out in addition, in the situation that not increasing hardware spending and changing hardware configuration, utilizes hardware resource more than needed, and the function of every protection of protective device and logic are tested automatically; The automatic fetch protection definite value of autotest program, analog quantity sampled value, monitoring and protecting action situation etc., complete test automatically; In process of the test, for each test point, software, by automatic fetch protection device action situation, is evaluated action situation; After all having tested, working value and action evaluation situation are generated to verification report automatically.
As shown in Figure 3, the defencive function automatic Verification method of microcomputer type main transformer differential protective device provided by the invention comprises the following step of carrying out in order:
Step 1) start the S01 stage of checking mode: by the man-machine interface menu on main transformer differential protective device, enter checking mode;
Step 2) the S02 stage of locking external communication sampling: enter after checking mode, program automatically completes and exchanges input switching, the input of locking external communication, the interchange that automatic test module is produced input passes to protection module;
Step 3) the S03 stage of fetch protection control word and definite value: reading device protection definite value, control word setting and outside intake state, the hard pressing plate of fetch protection control word and external function is thrown the state that moves back automatically;
Step 4) enter the S04 stage of a test: the defencive function sequence that device is possessed, order is carried out each defencive function test;
Step 5) the S05 stage that whether judgement protection drops into: according to the control word reading and pressing plate state, the protection type that definite needs are tested, if this protection control word and defencive function pressing plate are all input state, enter next step S06 stage, otherwise next step reenters the S04 stage;
Step 6) the S06 stage of other defencive functions of locking: by other defencive function lockings except test event, avoid other protection actions to impact test result;
Step 7) according to definite value, generate the S07 stage of cycle tests: read the test template of this protection, according to defencive function verification project and the protection definite value reading, generate defencive function cycle tests;
Step 8) exchange the S08 stage of input quantity assignment: according to cycle tests, alternating current, magnitude of voltage are assigned to built-in variable; Start to automatically perform testing scheme after test, the interchange input quantity in simulated failure situation is delivered to the logic module of protection CPU, thus simulated failure situation;
Step 9) the S09 stage that whether judgement protection moves: according to the protection action situation of CPU and the startup situation of CPU, whether judgement protection moves, if judgment result is that "Yes", enters next step S10 stage; Otherwise next step reenters the S08 stage;
Step 10) the S10 stage of operation of recording value and action evaluation: after protection CPU and startup CPU move simultaneously, finish single test, and carry out again twice same test, same function is carried out to 3 tests; Input value and the actuation time of the each action of record, according to above result, this defencive function is evaluated;
Step 11) the S11 stage of de-preservation function locking a: defencive function is removed the locking of other protections after having tested;
Step 12) the S12 stage that whether judgement test completes: judge whether this protection is last, if judgment result is that "Yes", enters next step S13 stage, test finishes; Otherwise next step reenters the S04 stage, proceed the test of the next item down defencive function;
Step 13) the S13 stage of systematic function verification report: according to test result, load the template completion function check report prelisting;
Step 14) the S14 stage of printed report: printing function verification report;
Step 15) exit the S15 stage of checking mode: after reporting printing completes, automatically exit checking mode;
Step 16) open the S16 stage of external communication sampling: open external communication sampling, recovery and protection device normal operating conditions;
Step 17) complete: this automatic Verification flow process so far finishes.
The automatic fetch protection definite value of the present invention, analog quantity sampled value, monitoring and protecting action situation etc.Automatically complete test, in process of the test, software, by automatic fetch protection device action situation, is evaluated action situation.After all having tested, working value and action evaluation situation are generated as to verification report automatically.
At S07, in the stage, the generation method of described cycle tests is: according to the principle of respective type protection, work out, excessive protection is progressively increased to 1.2 times of definite values since 0, for the amount of owing, protection is progressively decreased to 0.8 times of definite value from normal condition; Comprising three kinds of protection types: differential protection function, secondary harmonic brake and overcurrent protection (being not limited only to these three kinds protection types); On the south the RCS9671C type based Transformer differential protection of auspicious relay protection be example, the verification principle of relevant defencive function is as follows:
(1) differential protection function
Ratio brake formula differential protection generally adopts syllogic ratio brake principle, the three-winding transformer that high-pressure side is internal bridge of take is example, and each side current diagram of the three-winding transformer that a kind of typical ratios formula differential protection operating space schematic diagram and high-pressure side are internal bridge as shown in Figure 4, Figure 5; Its operation equation is:
I
d＞I
cdqd I
r≤0.5I
e
I
d-I
cdqd＞K
bl*(I
r-0.5I
e) 0.5I
e＜I
r≤3I
e
I
d-I
cdqd-K
bl*2.5I
e＞I
r-3I
e I
r＞3I
e
Wherein: K
blfor ratio brake coefficient I
cdqdfor difference current starting definite value
The three-winding transformer that is internal bridge to high-pressure side, a kind of typical case of difference current and stalling current follows the example of as follows:
I
d＝|i
1+i
2+i
3+i
4|
I
r＝0.5(|I
1|+|I
2|+|I
3|+|I
4|)
Method of calibration:
1.1) single-phase test: select the high, medium and low side of a phase main transformer single-phase current (I1a, I1b, I1c, I2a, I2b, I2c ..., I4a, I4b, I4c) starting from scratch increases gradually; all the other remain 0 mutually, until differential protection action or difference current Id reach 1.2 times of differential starting current Icdqd.Action current now of record and difference current Id, stalling current Ir value.
1.2) alternate test: for example, pass into single-phase current (for example high-pressure side A phase current I1a) in transformer Y side (high-pressure side), size is K times (K is test coefficient, K=0.5,1.5,3,5) of this side secondary rated current; In corresponding main transformer low pressure Δ side, pass into corresponding biphase current (being A, C two-phase to 11 wiring), size is K times of this side secondary ratings, and make high-pressure side A phase current I1a and low-pressure side A phase current I4a reverse, low-pressure side A phase current I4a and low-pressure side C phase current I4c are reverse.Reduce gradually the size of high-pressure side A phase current I1a, until differential protection action, the value of record high-pressure side A phase current I1a now.Change the value of K, repeat 1-2 step, obtain the action record under different K values, cover three sections of ratio brake curve, action current now of record and difference current Id, stalling current Ir value.
1.3) evaluation method: comparison the settled value curve moves average evaluation, if operating point (Ir, Id) drops within the scope of Fig. 4 difference current Id action broken line ± 2% working value, is considered as protecting correct operation.
(2) secondary harmonic brake
2.1) method of testing: single-phase current (I1a, I1b, I1c, I2a, I2b, I2c that the high, medium and low side of main transformer is set ...) secondary harmonic component is the 1.2K doubly (definite value that K is secondary harmonic brake) of first-harmonic value, all the other phase currents are set to zero.Start from scratch and increase this phase current values, to this phase current first-harmonic value be 1.2 times of differential starting current Icdqd.Reduce gradually second harmonic component, to differential protection action or secondary harmonic component lower than the 0.8K of first-harmonic value doubly, record secondary harmonic component now.
2.2) evaluation method: when secondary harmonic component is greater than 1.2K times of first-harmonic, differential protection is failure to actuate; When progressively reducing secondary harmonic component to 0.98K, during 1.02K times of first-harmonic content interval, differential protection action, is considered as protecting correct operation.
(3) overcurrent protection
3.1) method of testing: the single-phase current of the high, medium and low side of main transformer (I1a, I1b, I1c, I2a, I2b, I2c ...) starting from scratch gradually increases, all the other remain 0 mutually, are greater than 1.2 times of protection definite values to this side overcurrent protection action or this phase current.Record action current value now.
3.2) evaluation method: overcurrent protection action, and working value is in this protection definite value 1 ± 2% scope time, is considered as protecting correct operation.
It is basis that the defencive function automatic Verification method of microcomputer type main transformer differential protective device provided by the invention be take the protection of existing microcomputer type main transformer differential, by reading device definite value district and outside pressing plate intake, according to the protection arranging, throw the situation of moving back and determine defencive function verification project; According to setting value, automatically generate testing scheme, alternating current and voltage two sub-values of simulation external fault information are assigned to corresponding built-in variable, thus simulated failure situation.According to testing scheme, change input until protection is moved, and record test process and analyze working value, thereby complete a defencive function test.
Utilize this method can automatically complete main after the tranformer protection of one comprise that fast differential over current protection, differential protection, each side press the defencive function verifications such as overcurrent again; After completing function check, automatically generate test report and print, can whether meet relevant requirements according to related data intuitive judgment protection action situation.
Whole test macro is integrated in protective device, take existing hardware as basis, does not need additionally to increase hardware.Whole test process, except not needing external communication loop input AC amount for simulating various failure conditions, test also indistinction with adopting protection tester.By display screen, show in real time test mode, can realize the personal monitoring of whole test process.
Claims (2)
1. a defencive function automatic Verification method for microcomputer type main transformer differential protective device, is characterized in that: described method comprises the following step of carrying out in order:
Step 1) start the S01 stage of checking mode: by the man-machine interface menu on main transformer differential protective device, enter checking mode;
Step 2) the S02 stage of locking external communication sampling: after checking mode, program automatically completes and exchanges input switching, the input of locking external communication, the interchange that automatic test module is produced input passes to protection module;
Step 3) the S03 stage of fetch protection control word and definite value: reading device protection definite value, control word setting and outside intake state, the hard pressing plate of fetch protection control word and external function is thrown the state that moves back automatically;
Step 4) enter the S04 stage of a test: the defencive function sequence that device is possessed, order is carried out each defencive function test;
Step 5) the S05 stage that whether judgement protection drops into: according to the control word reading and pressing plate state, the protection type that definite needs are tested, if this protection control word and defencive function pressing plate are all input state, enter next step S06 stage, otherwise next step reenters the S04 stage;
Step 6) the S06 stage of other defencive functions of locking: will, except test event other defencive function lockings of other places, avoid other protection actions to impact test result;
Step 7) according to definite value, generate the S07 stage of cycle tests: read the test template of this protection, according to defencive function verification project and the protection definite value reading, generate defencive function cycle tests;
Step 8) exchange the S08 stage of input quantity assignment: according to cycle tests, alternating current, magnitude of voltage are assigned to built-in variable; Start to automatically perform testing scheme after test, the interchange input quantity in simulated failure situation is delivered to the logic module of protection CPU, thus simulated failure situation;
Step 9) the S09 stage that whether judgement protection moves: according to the startup situation of the action situation of protection CPU and startup CPU, whether judgement protection moves, if judgment result is that "Yes", enters next step S10 stage; Otherwise next step reenters the S08 stage;
Step 10) the S10 stage of operation of recording value and action evaluation: after protection CPU and startup CPU move simultaneously, finish single test, and carry out again twice same test, same function is carried out to 3 tests; Input value and the actuation time of the each action of record, according to above result, this defencive function is evaluated;
Step 11) the S11 stage of de-preservation function locking a: defencive function is removed the locking of other protections after having tested;
Step 12) the S12 stage that whether judgement test completes: judge whether this protection is last, if judgment result is that "Yes", enters next step S13 stage, test finishes; Otherwise next step reenters the S04 stage, proceed the test of the next item down defencive function;
Step 13) the S13 stage of systematic function verification report: according to test result, load the template completion function check report prelisting;
Step 14) the S14 stage of printed report: printing function verification report;
Step 15) exit the S15 stage of checking mode: after reporting printing completes, automatically exit checking mode;
Step 16) open the S16 stage of external communication sampling: open external communication sampling, recovery and protection device normal operating conditions;
Step 17) complete: this automatic Verification flow process so far finishes.
2. the defencive function automatic Verification method of microcomputer type main transformer differential protective device according to claim 1, it is characterized in that: at S07 in the stage, the generation method of described defencive function cycle tests is: according to the principle of respective type protection, work out, excessive protection is progressively increased to 1.2 times of definite values since 0, and for the amount of owing, protection is progressively decreased to 0.8 times of definite value from normal condition; Comprising three kinds of protection types: differential protection function, secondary harmonic brake and overcurrent protection.
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| CN105301369B (en) * | 2015-10-20 | 2017-12-26 | 国家电网公司 | A kind of bus protection compound voltage lockout function test method |
| CN108646166B (en) * | 2018-04-12 | 2020-04-14 | 广东电网有限责任公司 | Flexible direct current starting loop differential protection test method based on phase compensation |
| CN108646166A (en) * | 2018-04-12 | 2018-10-12 | 广东电网有限责任公司 | A kind of flexible direct current starting-up later time differential protection test method based on phase compensation |
| CN109713647A (en) * | 2019-02-22 | 2019-05-03 | 南京电研电力自动化股份有限公司 | A kind of busbar protective device redundancy design method |
| CN110323713A (en) * | 2019-07-25 | 2019-10-11 | 深圳供电局有限公司 | A kind of dual protection screen fixed value modification method and system |
| CN110531248A (en) * | 2019-08-20 | 2019-12-03 | 深圳供电局有限公司 | A kind of method of calibration and system of the preposition pressing plate of protective relaying device |
| CN110531248B (en) * | 2019-08-20 | 2022-01-04 | 深圳供电局有限公司 | Calibration method and system for front pressing plate of relay protection device |
| CN113376521A (en) * | 2021-06-18 | 2021-09-10 | 四川华能宝兴河水电有限责任公司 | Generator protection and excitation system matching checking method |
| CN113917261A (en) * | 2021-09-30 | 2022-01-11 | 广东电网有限责任公司 | Direct current protection equipment-oriented differential protection parameter verification method and device |
| CN113917261B (en) * | 2021-09-30 | 2023-08-04 | 广东电网有限责任公司 | Differential protection parameter verification method and device for direct current protection equipment |
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