CN106340863B - A kind of guard method of adaptive transient current quick-break - Google Patents
A kind of guard method of adaptive transient current quick-break Download PDFInfo
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- CN106340863B CN106340863B CN201610999955.1A CN201610999955A CN106340863B CN 106340863 B CN106340863 B CN 106340863B CN 201610999955 A CN201610999955 A CN 201610999955A CN 106340863 B CN106340863 B CN 106340863B
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- 230000003044 adaptive effect Effects 0.000 title claims abstract description 14
- 230000001052 transient effect Effects 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005070 sampling Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
A kind of guard method of adaptive transient current quick-break.It includes the present current value for reading supply line；Current value=the fault current component for the supply line that present current value-last time of this supply line read reads；Judge whether jump-value of current startup occur according to fault current component；Determine fault type；Judge whether measured current is more than the calculation of short-circuit current value of line end；Transmission trip signal and etc..Effect of the present invention：Although the short circuit current flow of any point changes with the change of system reactance at the same time in the short circuit current flow and circuit of line end; but the short circuit current flow that the short circuit current flow of arbitrary point is always greater than or is calculated equal to line end on circuit; this adaptive change; so that the sensitivity of protective device is improved; realize the protection domain of total track length 100%; protective device can instantaneously cut off failure, and more traditional instantaneous quick-break current protection is improved.
Description
Technical field
The invention belongs to power line protection technical field, more particularly to a kind of protection of adaptive transient current quick-break
Method.
Background technology
In electric system, traditional transient current fast tripping protection setting valve will be engaged with next stage quick-break electric current, by
In it without the time limit, therefore the protection seting value of the current quick-breaking adjacent lines outlet three-phase under maximum operational mode that to stagger is short
The electric current of protective device installation place is flowed through during road.When in non-maximum operational mode or minimum operational mode, the scope protected
It will diminish, it could even be possible to there is the situation that protection domain is zero.The protection domain of transient current quick-break is by system operation mode
Influence very big, the defects of being one very serious.
Fig. 1 is a kind of existing electric system electrical primary wiring diagram, is now illustrated by taking system shown in Figure 1 as an example：
Calculate short circuit current flow of the system in B busbar short-circuits：
Three short circuit current under maximum operational mode:
Line to line fault electric current：
Three short circuit current under minimum operational mode:
Line to line fault electric current：
By result of calculation as it can be seen that for the short circuit current flow to stagger under B busbar maximum operational modes, protection seting value needs
It is greater than 1643A (three-phase shortcircuit) and 1429A (line to line fault), and the short circuit current flow under minimum operational mode at B busbares is far small
In above numerical value, therefore current fault-clearing protective relays will be difficult to effective action under system minimum operational mode.
The content of the invention
To solve the above-mentioned problems, it is an object of the invention to provide a kind of protection side of adaptive transient current quick-break
Method.
In order to achieve the above object, the guard method of adaptive transient current quick-break provided by the invention includes holding in order
Capable the following steps：
Step 1) current sample：The current sample is the circulating sampling for each cycle of supply line's electric current
In unitary sampling, utilize line current mutual inductor read supply line present current value；
Step 2) calculates fault current component：The power supply that present current value-last time of this supply line read reads
Current value=fault current component of circuit；
Step 3) judges whether jump-value of current startup occur according to above-mentioned fault current component：By above-mentioned fault current point
Amount is compared with the protection seting value for current supply line's short circuit current flow that the moment microcomputer calculates in real time, if above-mentioned failure
Current component is greater than or equal to the protection seting value of current supply line's short circuit current flow, and jump-value of current startup occurs in judgement, under
One step performs step 5), otherwise performs step 4) in next step；
Step 4) normal operation program：Terminate this circular flow, return and wait subsequent cycle to run；
Step 5) determines fault type；A, B, C three-phase electricity flow valuve obtained according to line current mutual inductor measuring carries out failure classes
Type judges, is otherwise two-phase short-circuit fault for three phase short circuit fault if meeting IA+IC=-IB or IA+IB+IC=0；
Step 6) judges whether measured current is more than the calculation of short-circuit current value of line end：By above-mentioned steps 1) obtain
The present current value of supply line is compared with the calculation of short-circuit current value of line end, if the current flow of supply line
Value performs step 7), otherwise performs step 4) in next step in next step more than the calculation of short-circuit current value of line end；
Step 7) sends trip signal：Tripping line switching, disengagement failure line power.
The guard method of adaptive transient current quick-break provided by the invention has the effect that：
Although the short circuit current flow of any point is at the same time with the change of system reactance in the short circuit current flow and circuit of line end
Change and change, but the short circuit current flow that the short circuit current flow of arbitrary point is always greater than or is calculated equal to line end on circuit, it is this
Adaptive change so that the sensitivity of protective device is improved, and realizes the protection domain of total track length 100%, protects
Protection unit can instantaneously cut off failure, and more traditional instantaneous quick-break current protection is improved.
Brief description of the drawings
Fig. 1 is a kind of existing electric system electrical primary wiring diagram.
Fig. 2 is the guard method flow chart of adaptive transient current quick-break provided by the invention.
Embodiment
Below in conjunction with the accompanying drawings with specific embodiment to the guard method of adaptive transient current quick-break provided by the invention into
Row describes in detail.
As shown in Figure 1, in order to allow protection domain to include A, B supply line total length, guarantor is used as using B busbar short-circuits electric current
Protect setting valve.This protection seting value is changed with the change of the method for operation, also different and different because of short-circuit-type, for this
Microcomputer Calculation system reactance value Xs1 must be utilized in real time, and short-circuit current value at B busbares is calculated further according to system reactance value Xs1,
The value is the protection seting value of current supply line's short circuit current flow.By the current supply line's short circuit current flow calculated in real time
Protection seting value is stored in a certain region of RAM random access memory, then measures supply line in real time using line current mutual inductor
Present current value, then calculate fault current component, afterwards current supply the fault current component of synchronization with above-mentioned
The protection seting value of electric line short circuit current flow is compared, if current failure current component is greater than or equal to the moment microcomputer meter
The protection seting value of the supply line's short circuit current flow calculated, you can be judged as that the short circuit occurs in AB supply lines region, so
Fault type is determined afterwards, and whether the last present current value according to the supply line measured in real time is more than the short circuit of line end
Current calculation value decides whether to send trip signal.
As shown in Fig. 2, the guard method of adaptive transient current quick-break provided by the invention includes performing down in order
Row step：
Step 1) current sample：The current sample is the circulating sampling for each cycle of supply line's electric current
In unitary sampling, utilize line current mutual inductor read supply line present current value；
Step 2) calculates fault current component：The power supply that present current value-last time of this supply line read reads
Current value=fault current component of circuit；
Step 3) judges whether jump-value of current startup occur according to above-mentioned fault current component：By above-mentioned fault current point
Amount is compared with the protection seting value for current supply line's short circuit current flow that the moment microcomputer calculates in real time, if above-mentioned failure
Current component is greater than or equal to the protection seting value of current supply line's short circuit current flow, and jump-value of current startup occurs in judgement, under
One step performs step 5), otherwise performs step 4) in next step；
Step 4) normal operation program：Terminate this circular flow, return and wait subsequent cycle to run；
Step 5) determines fault type；A, B, C three-phase electricity flow valuve obtained according to line current mutual inductor measuring carries out failure classes
Type judges, is otherwise two-phase short-circuit fault for three phase short circuit fault if meeting IA+IC=-IB or IA+IB+IC=0；
Step 6) judges whether measured current is more than the calculation of short-circuit current value of line end：By above-mentioned steps 1) obtain
The present current value of supply line is compared with the calculation of short-circuit current value of line end, if the current flow of supply line
Value performs step 7), otherwise performs step 4) in next step in next step more than the calculation of short-circuit current value of line end；
Step 7) sends trip signal：Tripping line switching, disengagement failure line power.
Claims (1)
- A kind of 1. guard method of adaptive transient current quick-break, it is characterised in that：The adaptive transient current quick-break Guard method includes the following steps performed in order：Step 1) current sample：The current sample is in the circulating sampling of each cycle of supply line's electric current Unitary sampling, the present current value of supply line is read using line current mutual inductor；Step 2) calculates fault current component：The supply line that present current value-last time of this supply line read reads Current value=fault current component；Step 3) judges whether jump-value of current startup occur according to above-mentioned fault current component：By above-mentioned fault current component with The protection seting value for current supply line's short circuit current flow that the moment microcomputer calculates in real time is compared, if above-mentioned fault current Component is greater than or equal to the protection seting value of current supply line's short circuit current flow, and jump-value of current startup occurs in judgement, in next step Step 5) is performed, otherwise performs step 4) in next step；Step 4) normal operation program：Terminate this circular flow, return and wait subsequent cycle to run；Step 5) determines fault type：A, B, C three-phase electricity flow valuve obtained according to line current mutual inductor measuring carries out fault type and sentences It is disconnected, it is otherwise two-phase short-circuit fault for three phase short circuit fault if meeting IA+IC=-IB or IA+IB+IC=0；Step 6) judges whether measured current is more than the calculation of short-circuit current value of line end：By above-mentioned steps 1) obtain power supply The present current value of circuit is compared with the calculation of short-circuit current value of line end, if the present current value of supply line is big In the calculation of short-circuit current value of line end, step 7) is performed in next step, otherwise performs step 4) in next step；Step 7) sends trip signal：Tripping line switching, disengagement failure line power.
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| CN109462204A (en) * | 2017-09-06 | 2019-03-12 | 国家电网公司 | A kind of method and device improving distribution line current quick sensitivity |
| CN108736437A (en) * | 2018-05-28 | 2018-11-02 | 国网天津市电力公司 | A kind of adaptive fast-tripping zero-sequence current protections method |
| CN109360777A (en) * | 2018-11-01 | 2019-02-19 | 湖南长高思瑞自动化有限公司 | A kind of fuse switch on-line monitoring method |
| CN109298289A (en) * | 2018-11-29 | 2019-02-01 | 广东电网有限责任公司 | Localization method, system and the electronic equipment of distribution network failure point |
| CN110416981B (en) * | 2019-07-31 | 2020-07-31 | 华北电力大学 | Electric automobile access distribution network area current protection method and system |
| CN110556784B (en) * | 2019-10-09 | 2022-02-08 | 鞍钢集团工程技术有限公司 | Relay protection configuration and setting method for high-voltage distribution system of ferroalloy electric furnace |
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