CN104280632B - Automatic detecting and early warning method for relay protection device and fault recorder - Google Patents

Abstract

Disclosed is an automatic detecting and early warning method for a relay protection device and a fault recorder. The method comprises the steps of acquiring data, calculating effective values, unifying the calculated effective values to the primary side, ranking the effective values, calculating the average value, determining a failure and the like. The method has the advantages that failures of the relay protection device and the fault recorder in an electric system can be found in time, the defect of the prior art that potential safety hazards can be caused by failure checking lag during periodical check can be overcome, and then the frequency of grid failures caused by failures of a device itself can be reduced greatly.

Description

A kind of protective relaying device and fault oscillograph detect method for early warning automatically

Technical field

The invention belongs to electric protection device and automatically detect early warning technology field, particularly relate to a kind of protective relaying device Automatically method for early warning is detected with fault oscillograph.

Background technology

Power grid security automaton breaks down when power system or during misoperation exactly, stable for preventing electrical network from losing With avoid occurrence of large-area to have a power failure, and automatic safety device commonly used in electrical network.

Automatic safety device is when the force device (such as electromotor, circuit etc.) in power system or power system itself are sent out When having given birth to fault and injured safe operation of power system, it is possible to send warning signal in time to operator, or directly Connect and send, to the chopper controlled, a kind of automation equipment that trip signal develops with termination event.Fault oscillograph is a kind of Can improve the important safety automaton of safe operation of power system, when power system is broken down or vibrates, it can be certainly The situation of change of various electric parameters dynamic, the record forward and backward process of fault exactly, staff passes through dividing of these electric parameters Analysis, compare, it is possible to analyzing and processing accident, judge protective relaying device whether correct operation, therefore to raising power system security Operation level has important function.Owing to protective relaying device and fault oscillograph are all to pass to the safe operation of power system Important, therefore power supply practice is typically wanted periodically protective relaying device and fault oscillograph to be verified, in order to send out in time Existing protective relaying device and fault oscillograph self fault that may be present, to keep in repair or to change, and then ensure the two All the time effect reliably is played in power system.But the drawback of periodic check is can not have found that it is likely that existence in time Fault, it is assumed that after protective relaying device itself fail again before this fault is detected and repairs, power system there occurs Operation troubles, then protective relaying device likely cannot make correct response, so that operation troubles expands further and makes Become heavy losses；Or fault oscillograph there occurs that fault and this fault are not yet detected and repair, and this cannot the most accurately remember Record Operation of Electric Systems data, thus the analysis and research that impact is to Operation of Electric Systems situation.Therefore, how can find in real time to continue Electrical protective device or fault oscillograph faults itself also carry out early warning in time, thus ensure protective relaying device and fault oscillograph Power system plays normally all the time, acts on reliably, for overcoming the drawback of periodic check, ensureing power system security Run, prevent fault large area from expanding important in inhibiting, also make the solution of this problem have great theory, society and warp Ji is worth.

Summary of the invention

In order to solve the problems referred to above, it is an object of the invention to provide a kind of protective relaying device and fault oscillograph is automatic Detection method for early warning, this method can find the fault of automatic safety device automatically and timely and accurately, simultaneously to staff Send early warning signal.

In order to achieve the above object, the present invention provides protective relaying device and fault oscillograph detect method for early warning automatically The following step including performing in order:

Step 1) gather data: according to the communication protocol of various different automatic safety devices, gather with for the moment from each device Carving or adjacent moment is starting point, during sampling, a length of 10 milliseconds of half cycles or 20 millisecond of 1 cycle goes out line current and bus line The transient data of voltage；

Step 2) calculate virtual value: based on the transient data of above-mentioned each device, calculate at described sampling duration interval Interior root-mean-square virtual value C_M, M is same primary equipment or the automatic safety device of interval transformer in collection is connected to transformer station Numbering, M=1,2,3......, root-mean-square virtual value C_MAlgorithm be the flat of instantaneous sampling data in a cycle or half cycles Just and extracting square root divided by number of samples, wherein N is sampling number, A again_M.iFor sampled instantaneous value:

$C_M=\sqrt{N^{-1}\underset{i=1}{\overset{N}{\Σ}}{A}_{M.i}^2}$

Step 3) arrive primary side: C by unified for above-mentioned calculating virtual value_M1For virtual value of M device, C_M2For M device Secondary virtual value, K_BIt is one or two no-load voltage ratios；

C_M1=C_M2×K_B

Step 4) virtual value sequence: a virtual value of whole devices is ranked up, finds out maximum and minima；

Step 5) breakdown judge: when the difference of maxima and minima is more than the 10% of minima, it is believed that there is sampling Fault, C_MaxAnd C_MinIt is respectively the maximum virtual value of device and a minimum virtual value；

$\frac{C_{Max}-C_{Min}}{C_{Min}}>10\%$

Step 6) calculate meansigma methods: calculate the meansigma methods of all samplings again；

Step 7) fault recognition: if maximum sampled value and the difference of meansigma methods are more than minimum sampled value and the difference of meansigma methods, then Think that maximum sampled value corresponding device has plant failure, otherwise it is assumed that equipment corresponding to minimum sampled value has a plant failure, and by Computer controls prior-warning device and sends early warning signal.

The protective relaying device of present invention offer and fault oscillograph detect the effect of method for early warning automatically: can send out in time The fault that in existing power system, protective relaying device and fault oscillograph exist, overcomes existing periodic check can produce fault row Look into delayed thus there is the drawback of potential safety hazard, thus the electric network fault caused because of device faults itself can be substantially reduced Number.

Accompanying drawing explanation

Protective relaying device and fault oscillograph that Fig. 1 provides for the present invention detect method for early warning flow chart automatically.

Detailed description of the invention

The protective relaying device and the fault oscillograph that there is provided the present invention with specific embodiment below in conjunction with the accompanying drawings are examined automatically Survey method for early warning is described in detail.

As it is shown in figure 1, it is to become that the protective relaying device of present invention offer and fault oscillograph detect method for early warning automatically Completing in the computer of relay protection information remote transmitting system substation, power station, it includes the following step performed in order:

Step 1) gather data: according to the communication protocol of various different automatic safety devices, gather with for the moment from each device Carve or adjacent moment be starting point, during sampling a length of 10 milliseconds (half cycles) or 20 milliseconds (1 cycles) go out line current and bus line The transient data of voltage；

Step 2) calculate virtual value: based on the transient data of above-mentioned each device, calculate at described sampling duration interval Interior root-mean-square virtual value C_M, M is same primary equipment or the automatic safety device of interval transformer in collection is connected to transformer station Numbering, M=1,2,3......, root-mean-square virtual value C_MAlgorithm be the flat of instantaneous sampling data in a cycle or half cycles Just and extracting square root divided by number of samples, wherein N is sampling number, A again_M.iFor sampled instantaneous value:

$C_M=\sqrt{N^{-1}\underset{i=1}{\overset{N}{\Σ}}{A}_{M.i}^2}$

Step 3) by unified for the above-mentioned calculating virtual value primary side that arrives: the no-load voltage ratio accessed in view of different device is different, all The calculating virtual value of device to be unified to a sub-value, it is simple to comparison, C_M1For virtual value of M device, C_M2For M device two Secondary virtual value, K_BIt is one or two no-load voltage ratios；

C_M1=C_M2×K_B

Step 4) virtual value sequence: a virtual value of whole devices is ranked up, finds out maximum and minima；

Step 5) breakdown judge: when the difference of maxima and minima is more than the 10% of minima, it is believed that there is sampling Fault, C_MaxAnd C_MinIt is respectively the maximum virtual value of device and a minimum virtual value；

$\frac{C_{Max}-C_{Min}}{C_{Min}}>10\%$

Step 6) calculate meansigma methods: calculate the meansigma methods of all samplings again；

Step 7) fault recognition: if maximum sampled value and the difference of meansigma methods are more than minimum sampled value and the difference of meansigma methods, then Think that maximum sampled value corresponding device has plant failure, otherwise it is assumed that equipment corresponding to minimum sampled value has a plant failure, and by Computer controls prior-warning device and sends early warning signal.

In technique scheme, in being connected to transformer station by acquisition, the relay of same primary equipment or interval transformer is protected Protect, electric current in automatic safety device, fault oscillograph and voltage data carry out the significance of difference and compare, if this difference Significance more than certain preset value then illustrate protective relaying device and fault oscillograph at least one there is plant failure, then send Early warning signal, the sampling of above-mentioned current/voltage and comparing is completed by computer, when needs early warning, computer controls report Alarm device action.This method can find protective relaying device and the fault of fault oscillograph in power system in time, overcomes existing It is delayed thus there is the drawback of potential safety hazard that some periodic checks can produce malfunction elimination.

It is as follows that the protective relaying device of present invention offer and fault oscillograph detect method for early warning specific works process automatically:

1, substation relay protection information substation establishes and stands interior each protective relaying device, fault oscillograph conjoint data Communication channel, gather with for the moment from each protective relaying device according to the communication protocol of respective relay protection or fault recorder data The one piece of data of the curtage of the unified channel of quarter or adjacent moment, time window is generally 20 milliseconds, and is converted For virtual value data, virtual value calculates and uses integration rms algorithm, and the quadratic sum of the most each sampled point is divided by number of samples again Evolution；

2, then to whole virtual value unifications to a sub-value, and be ranked up respectively by voltage and current, to minimax Value compares, when the difference of maxima and minima is more than the 10% of minima, it is believed that there is sampling fault, C_MaxAnd C_Min It is respectively the maximum virtual value of device and a minimum virtual value；

$\frac{C_{Max}-C_{Min}}{C_{Min}}>10\%$

If difference exceedes the 10% of minima between 3 electric current maximins, then calculate the average of whole current sample Value, if maximum sampled value is more than the difference of minimum sampled value and meansigma methods with the difference of meansigma methods, then it is assumed that maximum sampled value correspondence sets Have plant failure, otherwise it is assumed that equipment corresponding to minimum sampled value has plant failure；

If difference exceedes the 10% of minima between 4 voltage maximins, then calculate the average of whole voltage sample Value, if maximum sampled value is more than the difference of minimum sampled value and meansigma methods with the difference of meansigma methods, then it is assumed that maximum sampled value correspondence sets Have plant failure, otherwise it is assumed that equipment corresponding to minimum sampled value has plant failure；

When 5, needing to report to the police, computer it is signaled to prior-warning device, such as buzzer or light-emitting device etc..

At present, the device such as protective relaying device, automatic safety device, fault oscillograph, information remote transmitting system substation is Being widely used in the middle of power system, therefore power system security, reliable, stable operation are played most important by this method Effect.

Protective relaying device and fault oscillograph that the present invention provides automatically detect method for early warning and disclose a kind of relay guarantor Protection unit, automatic safety device, fault oscillograph self gathers or the detection method for early warning of mulual inductor malfunction, and the method is by real Time gather be connected to transformer station in same primary equipment (or the interval) relay protection of transformer, automatic safety device, failure wave-recording The transient data of device is compared, and analyses whether that whether difference is beyond set point, it is judged that whether device exists device self is adopted Collection fault or mulual inductor malfunction, and can early warning in time.

The present embodiment is to present inventive concept and an explanation of realization, is not limited, at structure of the present invention Under think of, without essence conversion technical scheme still in protection domain.

Claims (1)

1. a protective relaying device and fault oscillograph detect method for early warning automatically, it is characterised in that: it includes holding in order The following step of row:

Step 1) gather data: according to the communication protocol of various different automatic safety devices, from each device gather synchronization or Adjacent moment is starting point, and during sampling, a length of 10 milliseconds of half cycles or 20 millisecond of 1 cycle goes out line current and bus line voltage Transient data；

Step 2) calculate virtual value: based on the transient data of above-mentioned each device, calculate in described sampling duration interval Root-mean-square virtual value C_M, M is the volume of the automatic safety device of same primary equipment or interval transformer in collection is connected to transformer station Number, M=1,2,3......, root-mean-square virtual value C_MAlgorithm be the quadratic sum of instantaneous sampling data in a cycle or half cycles Extracting square root divided by number of samples, wherein N is sampling number, A again_M.iFor sampled instantaneous value:

$C_M=\sqrt{N^{-1}\underset{i=1}{\overset{N}{\Σ}}{A}_{M.i}^2}$

Step 3) arrive primary side: C by unified for above-mentioned calculating virtual value_M1For virtual value of M device, C_M2For M device secondary Virtual value, K_BIt is one or two no-load voltage ratios；

C_M1=C_M2×K_B

Step 4) virtual value sequence: a virtual value of whole devices is ranked up, finds out maximum and minima；

Step 5) breakdown judge: when the difference of maxima and minima is more than the 10% of minima, it is believed that there is sampling fault, C_MaxAnd C_MinIt is respectively the maximum virtual value of device and a minimum virtual value；

$\frac{C_{Max}-C_{Min}}{C_{Min}}>10\%$

Step 6) calculate meansigma methods: calculate the meansigma methods of all samplings again；

Step 7) fault recognition: if maximum sampled value and the difference of meansigma methods are more than minimum sampled value and the difference of meansigma methods, then it is assumed that Maximum sampled value corresponding device has plant failure, otherwise it is assumed that equipment corresponding to minimum sampled value has plant failure, and by calculating Machine controls prior-warning device and sends early warning signal.