CN1045849C - Power swing detection apparatus for electric power system - Google Patents
Power swing detection apparatus for electric power system Download PDFInfo
- Publication number
- CN1045849C CN1045849C CN95103484A CN95103484A CN1045849C CN 1045849 C CN1045849 C CN 1045849C CN 95103484 A CN95103484 A CN 95103484A CN 95103484 A CN95103484 A CN 95103484A CN 1045849 C CN1045849 C CN 1045849C
- Authority
- CN
- China
- Prior art keywords
- circuit
- output
- power fluctuation
- timer
- electric power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
An impedance variation rate detecting circuit (32) detects that an impedance change of the power system is under a constant value and when the detecting operation of this impedance detecting circuit (32) continues for a constant period preset in a self-detecting timer (33) or longer, a cancelling circuit (34) cancels that a cut-off command output to a protection relay apparatus 1 is rejected. Thereby, the protection relay apparatus 1 can quickly output a cut-off command not depending on operations of the fluctuation detecting and holding timer 30 and protection timers 23, 24.
Description
The present invention relates to a kind of power fluctuation checkout gear, it can detect output according to the power fluctuation in the electric power system, prevents that the protection relay group from tripping.
Figure 12 is the wiring diagram of the protection relay system of a common solidly grounded system (short circuit), and its publication is on the 90th page of electric power standard B-401 " protection relay and protection relay group " that Japanese Utilities Electric Co. and electric power development company set up according to Japanese Industrial Standards.Figure 13 is the common working waveform figure that a position when mho relay (shown in the 65th page of " electric joint study " the 37th the 1st phase of volume of being published by electric joint study association in May, 1981) obtains during for starting point.The trunnion axis of Figure 13 is represented the resistive component R of impedance, and vertical axis is represented the reactive component X of impedance.The phase characteristic that on Figure 13, can show mho relay, and Figure 14 to 17 is timing diagrams of explanation prior art work.
Among Figure 12; label 1 expression one protection relay group; it can be in detecting electric power system fault the time; for (not shown) circuit breaker and the switch that disposes in the electric power system produces and provides tripping operation; and label 2 expressions one power fluctuation checkout gear, it can detect according to the power fluctuation in the electric power system and prevent that protection relay group 1 from tripping.Label 3,4 and 5 expression 1 district short circuit mho relays (representing with 44S-1X1,44S-2X1 and 44S-3X1 among the figure), 1 district's line segment of first, second of their protection electric power system line segments and third phase; Label 6,7 and 8 expression 2 districts short circuit mho relays (representing with 44S-1X2,44S-2X2 and 44S-3X2 among the figure), 2 district's line segments of first, second of their protection line segments and third phase; And 9,10 and 11 expression 3 districts short circuit mho relays (representing with 44S-1D, 44S-2D and 44S-3D among the figure), 3 district's line segments of first, second of their protection line segments and third phase.Label 12 expression one short circuit offset-mho relay (representing with 440M among the figure) is in order to the power fluctuation in first, second and the third phase that detect the electric power system line segment; 13,14 and 15 is "AND" circuits, in order to the output that receives 1 district short circuit mho relay 3 to 5 and the output of 3 districts short circuit mho relay 9 to 11; 16 is OR circuits, in order to the output that receives "AND" circuit 13 to 15 and produce 1 district and export; And 17 are inhibit circuits, and its receives the output of OR circuit 16 and as the output of the power fluctuation checkout gear of forbidding importing 2 and produce the protection of 1 district and export.Label 18,19 and 20 expression "AND" circuits receive the output of 2 districts short circuit mho relay 6 to 8 and the output of 3 districts short circuit mho relay 9 to 11 as input; Label 21 is represented an OR circuit, in order to the output that receives "AND" circuit 18 to 20 and produce 2 districts and export; Label 22 and 27 is OR circuits, in order to the output that receives 3 districts short circuit mho relay 9 to 11 and produce the output of 3 districts; Label 23 is 2 districts protection timers, and it is made of a time-limited operation circuit, in order to protect the output of 2 districts and reception OR circuit 22; Label 24 is 3 districts protection timers, and it is made of a time-limited operation circuit, in order to protect the output of 3 districts and reception OR circuit 22; Label 25 is "AND" circuits, protects the output of timer 23 and OR circuit 21 and produces the protection output of 2 districts in order to receive 2 districts; Label 26 is OR circuits, in order to the 1 district protection output that receives inhibit circuit 17, the 2 districts protection output of "AND" circuit 25 and the 3 districts protection output of 3 districts protection timer 24, and in order to produce tripping operation; Label 28 is inhibit circuits, in order to receive as the output of the OR circuit of forbidding importing 27 and the output of short circuit offset-mho relay 12; Label 29 is that a power fluctuation detects timer, and it is made of the time-limited operation circuit, in order to receive the output of inhibit circuit 28; Label 30 is that a power fluctuation detects and the maintenance timer, and it is made of a time-limited operation and the reset circuit of prescribing a time limit, in order to receive the output of inhibit circuit 28; And label 31 expression OR circuits, in order to the output of received power surge detection and maintenance timer 30 and the output of power fluctuation detection timer 29, and the generation power fluctuation detects output.
The working condition of prior art is described referring to Figure 13 to 17.When power fluctuation takes place in the electric power system when, when then the variation of electric current and voltage is than the generation systems fault slowly many, and during fluctuation impedance along track shown in Figure 13.The track of this impedance during according to fluctuation, after t1 encouraged constantly, short circuit mho relay 9 to 11 encouraged in moment t2 at the short circuit offset-mho relay.If the time difference t1-t2 between t1 and the t2 exceeds the time-limited operation value that power fluctuation detects timer 29, then think and power fluctuation has taken place in the electric power system, and power fluctuation checkout gear 2 produces high potential " 1 ", detects the input of forbidding that inhibit circuit 17 is delivered in output as power fluctuation.Therefore, even short circuit mho relay road 3 to 5 and short circuit mho relay 9 to 11 are simultaneously or be later than their excitations, inhibit circuit 17 still continues to produce electronegative potential " 0 ", delivers to OR circuit 26 as invalid signals.As a result, OR circuit 26 does not trip.In other words, power fluctuation checkout gear 2 produces high potential " 1 ", detects output as power fluctuation and delivers to the input of forbidding of inhibit circuit 17, thereby prevent that protection relay group 1 from unnecessary tripping operation taking place.
When the locus of impedance when the power fluctuation shown in Figure 13 moved in the protection range of short circuit mho relay 9 to 11 in the hold in range of short circuit offset-mho relay 12, OR circuit 27 added to electronegative potential " 0 " input of forbidding of inhibit circuit 28; Inhibit circuit 28 adds to surge detection timer 29 and surge detection and maintenance timer 30 with high potential " 1 "; And OR circuit 31 adds to high potential " 1 " according to the short time-limited operation of surge detection timer 29 or surge detection and maintenance timer 30 input of forbidding of inhibit circuit 17.Then; when the locus of impedance when power fluctuation moved in the protection range of short circuit mho relay 9 to 11 outside the protection range of short circuit offset-mho relay 12, inhibit circuit 28 added to surge detection timer 29 and surge detection and maintenance timer 30 with electronegative potential " 0 ".When the output of surge detection timer 29 became electronegative potential " 0 ", OR circuit 31 was according to surge detection and keep resetting of timer 30 electronegative potential " 0 " to be added to the input of forbidding of inhibit circuit 17 in limited time.Therefore when the locus of impedance when fluctuating moves in the protection range of short circuit mho relay 9 to 11 outside the protection range of short circuit offset-mho relay 12; inhibit circuit 17 can and keep in surge detection after the resetting of timer 30 high potential " 1 " being added to OR circuit 26 as useful signal in limited time, to trip.In other words; power fluctuation checkout gear 2 adds to the forbid input of inhibit circuit 17 with electronegative potential " 0 " as power fluctuation detection output in surge detection with after keeping timer 30 to reset in limited time, thereby makes protection relay group 1 return a state that can produce tripping operation.
Simultaneously; referring to Figure 14-17; identical label is represented the signal waveform of identity unit among the figure; wherein a represents the signal waveform of short circuit offset-mho relay 12; b represents the signal waveform of short circuit mho relay 9 to 11; c represents the signal waveform of surge detection timer 29, and d represents surge detection and keeps the signal waveform of timer 30, and e represents the protection timer 23 in 2 districts and 3 districts and 24 signal waveform.During surge detection; in the protection range of short circuit mho relay 9 to 11; when the system failure by F1 indication among Figure 13 has taken place; if surge detection and the reset period Tr in limited time that keeps timer 30 protect the time-limited operation phase Tt (Tr＞Tt) of timer 24 greater than 2 districts protection timer 23 and 3 districts; see Figure 14; 2 districts protection timer 23 and 3 districts protection timer 24 are after its time-limited operation so; high potential " 1 " is added to OR circuit 26 as operation signal, and OR circuit 26 produces tripping operation.On the contrary; as shown in figure 15; if surge detection and the reset period Tr in limited time that keeps timer 30 protect the time-limited operation phase Tt (Tr＜Tt) of timer 24 less than 2 districts protection timer 23 and 3 districts; surge detection and maintenance timer 30 just add to electronegative potential " 0 " input of forbidding of inhibit circuit 17 as operation signal after it prescribes a time limit reset period so; and inhibit circuit 17 produces " 1 " to OR circuit 26, produces the useful signal of tripping operation as OR circuit 26.
The far away ground system failure of F2 indication in Figure 13 takes place (wherein the short circuit offset-mho relay encourage and short circuit mho relay 9 do not encourage to 11) after; when the system failure in the protection range of the short circuit mho relay in Figure 13 9 to 11 of F1 indication among Figure 13 takes place again; if as shown in figure 16; surge detection and the reset period Tr in limited time that keeps timer 30 protect the time-limited operation phase Tt (Tr＞Tt) of timer 24 greater than 2 districts protection timer 23 and 3 districts; 2 districts protection timer 23 and 3 districts protection timer 24 add to OR circuit 26 with high potential " 1 " as operation signal at its time-limited operation after date so, thereby OR circuit 26 produces tripping operation.On the contrary; if as shown in figure 17; surge detection and the reset period Tr in limited time that keeps timer 30 protect the time-limited operation phase Tt (Tr＜Tt) of timer 24 less than 2 districts protection timer 23 and 3 districts; surge detection and maintenance timer 30 add to electronegative potential " 0 " input of forbidding of inhibit circuit 17 as operation signal after it prescribes a time limit reset period so; inhibit circuit 17 adds to OR circuit 26 with " 1 " then, as OR circuit 26 in order to produce the useful signal of tripping operation.
In addition, though protected section of unshowned ground(preference) relay group one earth fault has taken place in mutually, short circuit biasing mho relay road 12 since its wide protection range still can encourage.As a result, power fluctuation checkout gear 2 detects the input of forbidding that output adds to inhibit circuit 17 with high potential " 1 " as power fluctuation, prevents that protection relay group 1 from producing unnecessary tripping operation.When after one earth fault takes place in mutually; again two-phase or more heterogeneous in during the generation systems fault; short circuit offset-mho relay 12 can encourage; and equally protect timer 23 and 3 districts to protect relation between the time-limited operation phase Tt of timer 24 according to surge detection and the reset period Tr in limited time that keeps timer 30 and 2 districts; the time-limited operation of protecting timer 23 and 3 districts protection timer 24 in 2 districts is after the phase or after the reset period in limited time of surge detection and maintenance timer 30, and the OR circuit 26 of self-shield relay group 1 produces in order to cut off the tripping operation of electric power system.
Owing to constitute the power fluctuation checkout gear 2 of prior art as mentioned above; so when generation systems fault between the power fluctuation detection period; generation systems fault in protected section again after the system failure takes place far; perhaps when one earth fault takes place in mutually after again two-phase or more heterogeneous in during the generation systems fault; such problem can appear; if promptly surge detection and keep the reset period Tr in limited time of timer 30 less than the time-limited operation phase Tt of 2 districts protection timer 23 and 3 districts protection timer 24 (Tr＜Tt), so protection relay group 2 can only be after power fluctuation detects and keeps the reset period in limited time of timer 30 just generation trip.
The system power fluctuation may change supply frequency.In this case, system power surge detection device 2 encourages according to the setting of the zero phase overcurrent relay detecting operation that constitutes the Earth Fault Detection parts, thereby the ground(preference) relay group produces unnecessary tripping operation.
The present invention is in order to address the above problem; and first purpose of invention is; system power surge detection device hinders and eliminates the obstruction that the protection relay group is produced tripping operation when the protection relay group produces tripping operation immediately by generation systems fault during the generation power fluctuation in electric power system; no matter and allow protection relay group surge detection and keep the reset period in limited time of timer and the relation of time-limited operation between the phase of 2 districts protection timer and 3 districts protection timer how all can produce tripping operation, thereby protect electric power system.
Second purpose of the present invention is; even after the earth fault far away that has the excitation of power fluctuation detection relay only takes place; in when, in protected section fault having taken place; by eliminating the obstruction that the protection relay group is produced tripping operation immediately; no matter and allow protection relay group surge detection and keep the reset period in limited time of timer and the relation of time-limited operation between the phase of 2 districts protection timer and 3 districts maintenance timer how can both produce tripping operation, thereby protect electric power system.
The 3rd purpose of the present invention is; even one earth fault takes place in mutually after again two-phase or more heterogeneous in when breaking down; by eliminating the obstruction that the protection relay group is produced tripping operation immediately; no matter and allow the period that is provided with of protection relay group power fluctuation detection relay how can both produce tripping operation, thereby protect electric power system.
The 4th purpose of the present invention be, even when having changed supply frequency by fluctuation in electric power system, can prevent that also the ground(preference) relay group from producing unnecessary tripping operation.
First aspect of the present invention according to requiring in the claim 1 provides a kind of power fluctuation checkout gear, and it comprises an impedance rate of change testing circuit, a fault detect timer and discharges circuit.
According to second aspect of the present invention that requires in the claim 2, a kind of power fluctuation checkout gear is provided, wherein system power flux permanent circuit makes the input coupling of the fault detect timer of the output of impedance rate of change testing circuit of first aspect present invention and first aspect present invention, with the output of received power surge detection.
According to the 3rd aspect of the present invention that requires in the claim 3, a kind of power fluctuation checkout gear is provided, wherein the system power flux permanent circuit of second aspect present invention is made by three input logical circuits, and it can receive the output of impedance rate of change testing circuit, the output of the failure detector circuit of overcurrent in the electric power system is exported and be used for detecting to the power fluctuation detection as input.
The 4th aspect of the present invention according to requiring in the claim 4 provides a kind of power fluctuation checkout gear, wherein is equipped with impedance rate of change testing circuit, the fault detect timer of first aspect present invention mutually and discharges circuit for each of electric power system.
The 5th aspect of the present invention according to requiring in the claim 5 provides a kind of power fluctuation checkout gear, wherein is equipped with the impedance rate of change testing circuit of fourth aspect present invention for each line segment of electric knife system mutually with each.
According to the 6th aspect of the present invention that requires in the claim 6, a kind of power fluctuation checkout gear is provided, wherein be equipped with a single-phase earthing testing circuit, thereby export the power fluctuation detection output that suppresses to detect relay in order to the power fluctuation that detects power fluctuation in the electric power system by the detection of single-phase earthing testing circuit.
In the power fluctuation checkout gear of first aspect present invention; detect when the impedance rate of change testing circuit under the impedance of electric power system and fall to below the predetermined value; and when preset time is long at interval in the time ratio fault detect timer that impedance rate of change testing circuit detecting operation is continued, discharge the circuit cancellation produces tripping operation to the protection relay group obstruction.
In the power fluctuation checkout gear aspect second of the present invention, received the system power flux permanent circuit just responding power surge detection output in case of necessity of impedance rate of change testing circuit output, excitation fault detect timer.
In the power fluctuation checkout gear of third aspect of the present invention, the system power flux permanent circuit that has received impedance rate of change testing circuit output in case of necessity just the overcurrent when output of responding power surge detection or electric power system fault detect output, excitation fault detect timer.
In the power fluctuation checkout gear aspect the 4th of the present invention; even when the power fluctuation in the electric power system changes supply frequency, the impedance rate of change testing circuit that each is equipped with mutually for electric power system can prevent that also the ground(preference) relay group from producing unnecessary tripping operation.
In the power fluctuation checkout gear aspect the 5th of the present invention; when the power fluctuation in the electric power system changed supply frequency, each can prevent that with the impedance rate of change testing circuit that each line segment is equipped with the ground(preference) relay group from producing unnecessary tripping operation mutually for electric power system.
In the power fluctuation checkout gear aspect the 6th of the present invention, when one earth fault takes place in mutually after, again two-phase or more heterogeneous in when breaking down, the single-phase earthing testing circuit can suppress power fluctuation and detect relay and produce power fluctuation and detect output.
In conjunction with the accompanying drawings, the above-mentioned and other purpose of the present invention, feature and advantage will become more obvious by following description.
Fig. 1 be one according to the embodiment of the invention 1, have the wiring diagram of the power fluctuation checkout gear of a protection relay group;
Fig. 2 is the working waveform figure of explanation embodiment 1 function, mho relay;
Fig. 3 is the figure of explanation embodiment 1 an impedance relay function;
Fig. 4 be one according to the embodiment of the invention 2, have the wiring diagram of the power fluctuation checkout gear of a protection relay group;
Fig. 5 be one according to the embodiment of the invention 3, have the wiring diagram of the power fluctuation checkout gear of a protection relay group;
Fig. 6 is a wiring diagram according to the power fluctuation checkout gear of the embodiment of the invention 4;
Fig. 7 is a timing diagram that shows embodiment 4 functions;
Fig. 8 is a wiring diagram according to the power fluctuation checkout gear of the embodiment of the invention 5;
Fig. 9 is a wiring diagram according to the power fluctuation checkout gear of the embodiment of the invention 6;
Figure 10 is a wiring diagram according to the power fluctuation checkout gear of the embodiment of the invention 7;
Figure 11 is a timing diagram that shows embodiment 7 functions;
Figure 12 is a wiring diagram with prior art power fluctuation checkout gear of a protection relay group;
Figure 13 is the working waveform figure of an explanation prior art function, mho relay;
Figure 14 is the timing diagram of an explanation prior art function;
Figure 15 is the timing diagram of an explanation prior art function;
Figure 16 is the timing diagram of an explanation prior art function; And
Figure 17 is the timing diagram of an explanation prior art function.
Described with reference to Fig. 1 to 11 for preferred embodiment of the present invention, same as the prior art or corresponding here part will be annotated with identical label.Embodiment 1 (claim 1)
Fig. 1 is the winding diagram according to the power fluctuation checkout gear that comprises protecting electrical power system relay group of the embodiment of the invention 1.In Fig. 1; protection relay group 1 comprises: 1 district short circuit mho relay 3-5; 2 districts short circuit mho relay 6-8; 3 districts short circuit mho relay 9-11; "AND" circuit 13-15; produce the OR circuit 16 of 1 district output; produce the inhibit circuit 17 of 1 district protection output mutually; "AND" circuit 18-20; produce the OR circuit 21 of 2 districts output; produce the OR circuit 22 of 3 districts output; constitute the 2 districts protection timer 23 of time-limited operation circuit; constitute the 3 districts protection timer 24 of time-limited operation circuit, produce the "AND" circuit 25 of 2 districts protection output and produce the OR circuit 26 of tripping operation action.Power fluctuation checkout gear 2 comprises: short circuit offset-mho relay 12, the OR circuit 27 that produces the protection output of 3 districts, inhibit circuit 28, the power fluctuation that constitutes the time-limited operation circuit detect the device 29 of fixing time, constitute time-limited operation and the power fluctuation that resets in limited time detects and keeps timer 30, produces OR circuit 31, impedance relay 32, fault detect timer 33 and release circuit 34 that power fluctuation detects output.Impedance relay 32 detects the impedance rate of change that is caused by the electric current of electric power system, voltage, and constitutes an impedance rate of change testing circuit, starts working when falling to when being lower than certain value this circuit under the impedance rate of change (varying width).The output of impedance relay 32 is coupled on the fault detect timer 33, and discharging circuit 34 is an inhibit circuit, and it receives the output of fault detect timer 33 as forbidding input, and the output that also receives OR circuit 31 detects output to produce power fluctuation.The output that discharges circuit 17 add to protection relay group 1 inhibit circuit 17 forbid input.Impedance relay 32 excitations when satisfying following formula;
|R(t)-R(t-180)|＜0.5Ω……(1)
| X (t)-X (t-180) |＜0.5 Ω ... (2) R (t) and x (t) represent the resistance and the reactive component of impedance respectively here.Corresponding data before R (t-180) and x (t-180) the expression half period.Therefore, in Fig. 3, if F
3=10 ohm and F
4=2 ohm, then formula (1) is false and formula (2) establishment.As a result, impedance relay 32 does not encourage.If F
3=10 ohm and F
4=9.6 ohm, above-mentioned two formulas are all set up, just excitation of impedance relay 32.
Below will narrate the operation of the embodiment of the invention 1 with reference to Fig. 2.The variation of electric current, voltage is slow when breaking down than system when an electric power system generation power fluctuation, and the track that impedance is followed as shown in Figure 2 changes.Corresponding to fluctuation locus of impedance constantly, short circuit offset-mho relay 12 is in moment t1 excitation, and short circuit mho relay 9-11 encourages at moment t2 subsequently.The same with prior art; if the operation time difference t1-t2 of t1, t2 constantly surpasses the operation time limit that power fluctuation detects the device 29 of fixing time; then electric power system is considered power fluctuation has taken place, and power fluctuation checkout gear 2 just sends the tripping operation action of high level " 1 " to prevent that 1 generation of protection relay group is unnecessary that detects output as power fluctuation to the input of forbidding of inhibit circuit 17.When the locus of impedance when fluctuation takes place among Fig. 2 moves on to short circuit offset-mho relay 12 protection ranges outside from the protection range inside of short circuit mho relay 9-11; after the reset period in limited time through surge detection and maintenance timer 30; power fluctuation checkout gear 2 sends the low level " 0 " that detects output as power fluctuation to the input of forbidding of inhibit circuit 17; therefore protection relay group 1 returns to the state that can produce the tripping operation action again, and this is identical with prior art.
Meanwhile, if in the protection range of short circuit mho relay 9-11 the system failure is taking place between the power fluctuation detection period, the locus of impedance that is then slowly changing will move to fault point F1, as shown in Figure 2.Because impedance is essentially a fixed value at fault point F1 place; impedance relay 32 is with regard to the checkout system fault; finish a time-limited operation through detecting timer behind the setting-up time, "AND" circuit 34 cancellations from OR circuit 31, be sent to protection relay group 1 detect the high level " 1 " of output as power fluctuation.As a result, OR circuit 26 just after the time-limited operation of 2 districts protections timer 23 and 3 districts protection timer 24 or resetting in limited time of surge detection and maintenance timer 30 produce a tripping operation action before finishing and no matter surge detection and keep the reset period in limited time of timer 30 and 2 districts protect the relation of time-limited operation between the phase that timer 23 and 3 districts protect timer 24 how.
Work as F
1The system failure of expression betides in the protection section of short circuit mho relay 9-11 and F in Fig. 2
2When taking place after the ground far away system failure of expression (short circuit offset-mho relay 12 encourages and short circuit mho relay 9-11 dead herein), impedance relay 32 detects system failure F
1, detect timer 33 and finish a time-limited operation, situation as described above therefrom.After the predetermined time of delay that causes by time-limited operation of a setting; detect timer 33 and send a high level " 1 ", and "AND" circuit 34 is cancelled this high level as detecting output from OR circuit 31, the power fluctuation that adds to protection relay group 1 to the input of forbidding of "AND" circuit 34.As a result, OR circuit 25 just produces a tripping operation action in limited time and no matter above-mentioned two kinds are prescribed a time limit and how concern between the phase after the time-limited operation of 2 districts protections timer 23 and 3 districts protection timer 24 or before the XianCheng that resets of surge detection and maintenance timer 30.
And; even protection section generation single phase ground fault at unillustrated earth protective device; owing to the protection range broad makes 12 excitations of short circuit offset-mho relay, power fluctuation checkout gear 2 produces unnecessary tripping operation action to the high level " 1 " of holding one of transmission to detect output as power fluctuation of forbidding of inhibit circuit 17 to prevent protection relay group 1.After above-mentioned single phase ground fault takes place; again when the above generation systems fault of two-phase or two-phase; impedance relay 32 detects the system failure; and "AND" circuit 34 will be cancelled from OR circuit 31 and be sent to the inhibit signal of protection relay group 1; OR circuit 26 just produces a tripping operation action like this, is similar to said circumstances.Embodiment 2 (claim 2)
Fig. 4 is the wiring diagram according to the power fluctuation checkout gear that comprises protecting electrical power system relay group of the embodiment of the invention 2.In Fig. 4, the characteristics of present embodiment 2 are, "AND" circuit 35 in order to the fixed system power flow is provided between impedance relay 32 (representing with △ RX among the figure) and detection timer 33, "AND" circuit 35 is sent in the output of the output of impedance relay 32 and OR circuit 31, and detection timer 33 is sent in the output of "AND" circuit 35.
Therefore, according to present embodiment 2, because the "AND" circuit 35 of fixed system power flow is by the output drive of OR circuit 31 and impedance relay 32, so relay 33 not excitations detection time when electric power system has power flow.Therefore, if electric power system generation power fluctuation, power fluctuation checkout gear 2 detects this fluctuation immediately except the operation of implementing embodiment 1, and prevents that protection relay group 1 from producing the tripping operation action.In brief, constant haply in order to keep voltage and current, power flow generally always flows in electric power system, will work so fall to when being lower than a predetermined value impedance relay 32 under impedance.Therefore; under the situation that does not have "AND" circuit 35 fixed system power flows; stoped from the power fluctuation that is released into circuit 34 and detected output; when power fluctuation takes place; the reset period of impedance relay 32 might the retarding power surge detection be exported, thereby has also postponed for preventing that protection relay group 1 from producing the tripping operation action.For the above-mentioned reasons, under the electric power system normal operation, the "AND" circuit 35 of fixed system power flow has played the effect that does not stop power fluctuation to detect output.As a result, power fluctuation checkout gear 2 detects power fluctuation immediately and prevents that protection relay group 1 from the tripping operation action taking place.Embodiment 3 (claim 3)
Fig. 5 is the wiring diagram according to the power fluctuation checkout gear that comprises protecting electrical power system relay group of the embodiment of the invention 3.In Fig. 5, the characteristics of present embodiment 3 are, the "AND" circuit 35 of the power flow of the fixed system of the foregoing description 2 is made up of the parts of one three output, the failure detector circuit 36 that detects relay such as overcurrent is provided, and the output of failure detector circuit 36 has been coupled to the additional output of "AND" circuit 35.
Therefore, according to present embodiment 3, electric current surpasses predetermined system failure value or voltage hangs down under the state of intervening fixed system failure value because failure detector circuit 36 is operated in, and power fluctuation checkout gear 2 just can not encourage where necessary.When electric power system generation power fluctuation, except the operation of implementing embodiment 2, power fluctuation checkout gear 2 detects power fluctuation immediately and prevents that protection relay group 1 from the tripping operation action taking place.Embodiment 4 (claim 4)
Fig. 6 is the wiring diagram according to the power fluctuation checkout gear that comprises protecting electrical power system relay group of the embodiment of the invention 4.Fig. 7 is a timing diagram of explaining the operation of embodiment 4.In Fig. 6, the characteristics of embodiment 4 are that the impedance relay 32 of (1) embodiment 2 is made up of the first phase ground connection impedance relay 51 (representing with △ RXG-1 among the figure), the second phase ground connection impedance relay 52 (representing with △ RXG-2 among the figure) and third phase impedance ground relay 53 (representing with △ RXG-3 among the figure); (2) "AND" circuit 35 of the fixed system power flow of the foregoing description 2 is made up of the first phase ground connection "AND" circuit 54, the second phase ground connection "AND" circuit 55 and third phase ground connection "AND" circuit 56, and each circuit of these three circuit receives the output of OR circuit 31 and receives the output of first phase, second phase, third phase impedance ground relay 51-53 independently of one another; (3) the fault detect timer 33 of the foregoing description 2 is made up of the first phase earth fault timer 66, the second phase earth fault timer 67 and third phase earth fault timer 68 and short-circuit detecting timer 69; (4) embodiment 2 described release circuit 34 are made up of first phase ground connection release circuit, second phase ground connection release circuit 71, third phase ground connection release circuit 72 and short circuit release circuit 73; (5) this device comprises: receive first phase, the "AND" circuit 57 of second phase and third phase ground connection "AND" circuit 54-56 output, receive first mutually with second "AND" circuit 58 of ground connection "AND" circuit 54 and 55 output mutually, receive the "AND" circuit 59 of the output of second phase and third phase ground connection "AND" circuit 55 and 56, receive the "AND" circuit 60 of the output of first phase and third phase ground connection "AND" circuit 54 and 56, receive the OR circuit 61 of the output of "AND" circuit 58-60, the output that receives OR circuit 61 with as the inhibit circuit 62 of the output of the "AND" circuit of forbidding importing 57 and receive as the output of the inhibit circuit of forbidding importing 62 with first mutually, second phase, the inhibit circuit 63-65 of the output of third phase ground connection "AND" circuit 54-56; (6) output of inhibit circuit 63-65 is coupled to respectively on first phase, second phase and the third phase Earth Fault Detection timer 66-68, the output of OR circuit 61 is coupled on the short-circuit detecting timer 69, the input of short-circuit detecting timer 69 is coupled to the input of forbidding that short circuit discharges circuit 73, and short circuit is discharged the output coupling of the input and the "AND" circuit 31 of circuit 73.
Therefore; according to present embodiment 4; because first phase, second mutually and third phase ground connection is detected defeated and short-circuit detecting output is separately to produce; so even supply frequency changes during the electric power system generation power fluctuation; except the operation of implementing the foregoing description 1, the power fluctuation checkout gear can prevent that the ground(preference) relay group from producing unnecessary tripping operation action.Referring to Fig. 7 (A), 7 (B) and 7 (C), identical label is represented the signal waveform of same circuits part among the figure, wherein label a represents the signal waveform of the first phase ground connection impedance relay 51, label b represents the signal waveform of the second phase ground connection impedance relay 52, label c represents the signal waveform of third phase impedance ground relay 53, label d represents the signal waveform of "AND" circuit 58 to 60, label e represents the signal waveform of "AND" circuit 57, label f represents the signal waveform of "AND" circuit 62, label g represents the signal waveform of inhibit circuit 63, and label h represents the signal waveform of inhibit circuit 64, and label i represents the signal waveform of inhibit circuit 65.In brief, when one mutually earth fault takes place when, shown in Fig. 7 (A), encourage with that impedance relay mutually that breaks down accordingly mutually with among the third phase impedance ground relay 51-53 in first phase, second, "AND" circuit 57-60, OR circuit 61 and inhibit circuit 62 equal deads have only an excitation among the "AND" circuit 63-65.When the two-phase earth fault shown in generation Fig. 7 of institute (B), in first phase, second phase and third phase impedance ground relay 51-53, have and those two that break down accordingly impedance relay excitations mutually, "AND" circuit 58-60 and OR circuit 61 excitations, "AND" circuit 57 deads, inhibit circuit 62 excitations, "AND" circuit 63-65 dead.And when the three-phase fault that takes place shown in Fig. 7 (C), first phase, second phase and third phase impedance ground relay all encourage, "AND" circuit 57-60 and OR circuit 61 excitations, inhibit circuit 62 deads, "AND" circuit 63-65 excitation.As a result, even supply frequency changes to some extent during electric power system generation power fluctuation, can prevent that also the ground(preference) relay group from producing unnecessary tripping operation action.Embodiment 5 (claim 5)
Fig. 8 is the wiring diagram according to the power fluctuation checkout gear that comprises protecting electrical power system relay group of the embodiment of the invention 5.In Fig. 8, the characteristics of embodiment 5 are that form mutually with third phase impedance ground relay 51-53, first mutually by short-circuit impedance relay 81 (representing with △ RXS-1 among the figure), the second phase short-circuit impedance relay 82 (representing with △ RXS-2 among the figure) and third phase short-circuit impedance relay 83 (representing with △ RXS-3 among the figure) by first phase, second for the impedance relay 32 among (1) embodiment 4; (2) "AND" circuit 35 of the fixed system power flow of the foregoing description 4 is made up of first phase, second phase and third phase short circuit "AND" circuit 84-86; (3) the fault detect timer 33 of the foregoing description 4 by first phase, second mutually and third phase Earth Fault Detection timer 66-68 with first mutually, second mutually and third phase short-circuit detecting timer 87-89 form.In present embodiment 5, the same with the above embodiments 4, discharge circuit 33 and form by first phase, second phase and third phase ground connection release circuit 70-72 and short circuit release circuit 73.
Therefore; according to present embodiment 5; different with embodiment 4; owing to all provide impedance relay and fault detect timer mutually to each here; thereby simplified the structure of logical circuit; even supply frequency changes during electric power system generation power fluctuation, can prevent that also the ground(preference) relay group from producing unnecessary tripping operation action.Embodiment 6 (claim 5)
Fig. 9 is the wiring diagram according to the checkout gear of the power fluctuation that comprises protecting electrical power system relay group of the embodiment of the invention 6.As shown in Figure 9, the characteristics of present embodiment 6 are that the short circuit of the above embodiments 5 discharges circuit 73 to be made up of first phase, second phase and third phase short circuit release circuit 91-93, goes up mutually first like this and can both produce short-circuit detecting output.
In Fig. 6,8 and 9, do not draw for simplicity's sake short circuit and ground(preference) relay group.Embodiment 7 (claim 6)
Figure 10 is the wiring diagram according to the power fluctuation checkout gear that comprises protecting electrical power system relay group of the embodiment of the invention 7.Figure 11 is a timing diagram of explaining the operation of present embodiment 7.In Figure 10, the characteristics of present embodiment 7 are that the inhibit circuit 28 of the foregoing description 1 contains two three input elements of forbidding input by one and constitutes, and the output signal of single-phase earthing testing circuit 47 is added to one of them and forbids input.Single-phase earthing testing circuit 47 is by forming with the lower part: three grades of ground connection mho relays 37,38 and 39 (among the figure respectively with 44G-1D, 44G-2D and 44G-3D represent), receive the OR circuit 40 of three grades of ground connection mho relay 37-39 output signals, receive the "AND" circuit 41 of three grades of ground connection mho relays 37 and 38 outputs, receive the "AND" circuit 42 of three grades of ground connection mho relays 38 and 39 outputs, receive the "AND" circuit 43 of three grades of ground connection mho relays 37 and 39 outputs, receive the OR circuit 44 of "AND" circuit 41-43 output, receive the "AND" circuit 45 of OR circuit 44 and OR circuit 40 outputs, constitute the time-limited operation circuit and detect timer 46 with the single-phase earthing that receives "AND" circuit 45 outputs.Single-phase earthing detects the input of forbidding that timer is coupled to inhibit circuit 28.
Therefore; according to present embodiment 7; because being used as, the output of single-phase earthing testing circuit 47 forbids that protection relay group 1 makes the signal of tripping operation action; even so taking place behind a single phase ground fault two-phase or the system failure more than the two-phase to take place again; except the operation of implementing embodiment 1, power fluctuation checkout gear 2 also can not hinder the protection relay unit and produce the tripping operation action.Referring to Figure 11 (A) and Figure 11 (B), identical label is represented the signal waveform of same circuits part among two figure, label a wherein, b and c represent the signal waveform of three grades of ground connection mho relays 37,38 and 39 respectively, d represents the signal waveform of OR circuit 40, label e represents the signal waveform of "AND" circuit 41 to 43, and label f represents the signal waveform of inhibit circuit 45, and label g represents the signal waveform of ground connection detection timer 46.In brief, when a single phase ground fault shown in Figure 11 (A) takes place when, a relay among excitation and the corresponding three grades of ground connection mho relay 37-39 of fault, the OR circuit 40 of excitation next stage, "AND" circuit 41-43 dead, excitation "AND" circuit 45, and single-phase earthing detection timer 46 is finished time-limited operation.When taking place one shown in Figure 11 (B) during double earthfault, two relays among excitation and the corresponding three grades of mho relay 37-39 of fault, excitation OR circuit 40 and "AND" circuit 41-43, "AND" circuit 45 deads, also the dead single-phase earthing detects timer.The result; even the binary system fault has taken place again after single phase ground fault, protection relay group 1 also can produce tripping operation action and immediately no matter surge detection and the reset period in limited time that keeps timer 30 and 2 districts protect the relation of time-limited operation between the cycle that timer 23 and 3 districts protect timer 24 how.
According to first aspect of the present invention; because detecting power system impedance at the impedance rate of change testing circuit falls to the detecting operation time that is lower than a predetermined value and this circuit under changing and discharges circuit when surpassing in the fault detect timer predetermined value and cancelled the obstruction that the protection relay group is taken place the function of tripping operation action; so have only power fluctuation to detect that the relay excitation system failure has taken place during as the electric power system power fluctuation or the protection section breaks down when this moment behind the earth fault far away, the protection relay unit will produce the tripping operation action and immediately no matter the reset period in limited time of surge detection and protection timer and 2 districts protect the relation of time-limited operation between the phase that timer and 3 districts protect timer how.
According to second aspect of the present invention, the system power flux permanent circuit that receives the output of impedance rate of change testing circuit by ground is just output of responding power surge detection and excitation fault detect timer when needed only, so can prevent the power fluctuation checkout gear misoperation that caused by moving rate flux in the electric power system.
According to the 3rd aspect of the present invention; overcurrent protection output when only just responding the output of detection of the power fluctuation in the electric power system or fault owing to the system power energy permanent circuit that receives the output of impedance rate of change testing circuit when needed and taking place encourages the fault detect timer; so the power fluctuation checkout gear does not need dead, and can prevent the misoperation of this device of causing by power flow in the electric power system effectively.
According to the 4th aspect of the present invention; owing to all provide the impedance rate of change testing circuit every going up mutually; and the power fluctuation checkout gear produces ground connection mutually and detects output and short-circuit detecting output every, so even supply frequency changes to some extent and can prevent that also the ground(preference) relay group from unnecessary tripping operation action taking place when power fluctuation.
According to the 5th aspect of the present invention; because each line segment in electric power system all provides the impedance rate of change testing circuit with every going up mutually; and the power fluctuation checkout gear go up to produce ground connection mutually and detects output and short circuit output every, so even supply frequency changes to some extent and can prevent that also the ground(preference) relay group from unnecessary tripping operation action taking place when power fluctuation.
According to the 6th aspect of the present invention; the two-phase or the system failure more than the two-phase take place again after single phase ground fault takes place; because the single-phase earthing testing circuit is provided; and the power fluctuation that detects the electric power system power fluctuation detects the output of relay to be forbidden, so the protection relay group produces the tripping operation action immediately no matter surge detection and the reset period in limited time that keeps timer and 2 districts protect the relation of time-limited operation between the phase that timer and 3 districts protect timer how.
Claims (6)
1. the power fluctuation checkout gear of an electric power system, it can send the order of opening circuit according to the protection relay group that power fluctuation detection output suppresses to protect electric power system to use, this power fluctuation checkout gear has a short circuit offset-mho relay, is used for detecting the single power fluctuation mutually of each line segment of electric power system; Three grades of output OR circuits are used to receive the output of three grades of short circuit mho relays, thereby each line segment of electric power system is carried out three-level protective; One inhibit circuit is used to the output of forbidding receiving three grades of outputs of three grades of output OR circuits and receiving described short circuit offset-mho relay; One power fluctuation detects timer, as a time-limited operation circuit, is used to receive the output of described inhibit circuit; One power fluctuation detects and keeps timer, and it is used to receive the output of described inhibit circuit as a time-limited operation and the reset circuit of prescribing a time limit; And an OR circuit, it receives described power fluctuation and detects and keep the output of timer and the output that power fluctuation detects timer, and be used to produce a power fluctuation and detect output,
It is characterized in that described power fluctuation checkout gear also comprises:
One is used for detecting the impedance rate of change testing circuit of electric power system middle impedance rate of change;
One the fault detect timer that output encouraged by the impedance rate of change testing circuit; And
One is used for detecting the logic product of exporting according to the output and the power fluctuation of fault detect timer, eliminates that the protection relay group is produced the release circuit that tripping operation hinders.
2. the power fluctuation checkout gear of electric power system according to claim 1, it is characterized in that the system power flux permanent circuit of exporting in order to the received power surge detection makes the output of impedance rate of change testing circuit and the input interconnection of fault detect timer.
3. the power fluctuation checkout gear of electric power system according to claim 2, it is characterized in that, system power flux permanent circuit is made up of the amount logical circuit, and the output, power fluctuation that logical circuit is used for receiving the impedance rate of change testing circuit detects output and in order to the output of the failure detector circuit of overcurrent in the detection electric power system.
4. the power fluctuation checkout gear of electric power system according to claim 1 is characterized in that, for each of electric power system is equipped with impedance rate of change testing circuit, fault detect timer mutually and discharges circuit.
5. the power fluctuation checkout gear of electric power system according to claim 4 is characterized in that, for each line segment of electric power system is equipped with the impedance rate of change testing circuit mutually with each.
6. power fluctuation checkout gear as claimed in claim 1 is characterized in that, comprises a single-phase earthing testing circuit, and it is used for detecting the single phase ground fault in the electric power system and detects output according to it and suppress the output that power fluctuation detects relay.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP089356/94 | 1994-04-27 | ||
| JP6089356A JP2798885B2 (en) | 1994-04-27 | 1994-04-27 | Power fluctuation detection device for power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1122962A CN1122962A (en) | 1996-05-22 |
| CN1045849C true CN1045849C (en) | 1999-10-20 |
Family
ID=13968440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95103484A Expired - Lifetime CN1045849C (en) | 1994-04-27 | 1995-04-27 | Power swing detection apparatus for electric power system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2798885B2 (en) |
| CN (1) | CN1045849C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102656762B (en) * | 2009-12-16 | 2015-01-07 | 西门子公司 | Protection for parallel lines in an electrical power supply system |
| CN104037741B (en) * | 2009-12-16 | 2017-10-24 | 西门子公司 | The protection of the parallel wire of electrical energy supply system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003070151A (en) * | 2001-08-27 | 2003-03-07 | Toshiba Corp | Protective relay |
| US9496706B2 (en) | 2008-07-07 | 2016-11-15 | Abb Research Ltd. | Fast power swing unblocking method and apparatus for distance protection in power system |
| EP2301128B1 (en) | 2008-07-17 | 2017-03-22 | Siemens Aktiengesellschaft | Method for producing a fault signal and electric protective device |
| CN111323644B (en) * | 2020-03-17 | 2022-11-18 | 广东恒港电力科技股份有限公司 | Intelligent monitoring method and system based on electric energy meter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045666A (en) * | 1989-03-15 | 1990-09-26 | 刘联和 | Commutating distribution-difference type relay-protection part |
| CN2101940U (en) * | 1991-10-23 | 1992-04-15 | 张护民 | Reactive power compensating controller for current fluctuation |
| CN2147674Y (en) * | 1993-01-14 | 1993-11-24 | 赵根田 | Wire distribution section protection and grounding display device |
-
1994
- 1994-04-27 JP JP6089356A patent/JP2798885B2/en not_active Expired - Fee Related
-
1995
- 1995-04-27 CN CN95103484A patent/CN1045849C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045666A (en) * | 1989-03-15 | 1990-09-26 | 刘联和 | Commutating distribution-difference type relay-protection part |
| CN2101940U (en) * | 1991-10-23 | 1992-04-15 | 张护民 | Reactive power compensating controller for current fluctuation |
| CN2147674Y (en) * | 1993-01-14 | 1993-11-24 | 赵根田 | Wire distribution section protection and grounding display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102656762B (en) * | 2009-12-16 | 2015-01-07 | 西门子公司 | Protection for parallel lines in an electrical power supply system |
| CN104037741B (en) * | 2009-12-16 | 2017-10-24 | 西门子公司 | The protection of the parallel wire of electrical energy supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1122962A (en) | 1996-05-22 |
| JP2798885B2 (en) | 1998-09-17 |
| JPH07298499A (en) | 1995-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11264794B2 (en) | Series compensator and control method | |
| CA2007778C (en) | Directional comparison blocking protective relay system | |
| CA2621538C (en) | Method and system for through fault detection in electrical devices | |
| CN102280869A (en) | Switching device | |
| CN1045849C (en) | Power swing detection apparatus for electric power system | |
| CN100401609C (en) | Improved power-line protection | |
| US6937453B2 (en) | Directional comparison distance relay system | |
| KR20040014364A (en) | Directional ground relay system | |
| US6775117B2 (en) | Zero threshold surge suppressor | |
| JP3227653B2 (en) | Power system protection controller | |
| Gomez et al. | Specific energy concept applied to the voltage sag ride-through capability of sensitive equipment in dg embedded systems | |
| SU1739437A1 (en) | Device for automatic unloading of power supply system when one of its lines is disconnected | |
| JPH07302674A (en) | Arrester provided with switch | |
| CN1295367A (en) | Digitally protected and controlled motor | |
| CN2847639Y (en) | Arc extinction and resonance extinction protector in nuetral point non-effective earthing system | |
| JP5300319B2 (en) | Distance relay device | |
| EP1188211A1 (en) | An electrical machine winding ground-fault protection system | |
| SU1693678A1 (en) | Device for remote protection | |
| CA1311828C (en) | Positive sequence distance relay for ac power transmission line protection | |
| SU1144166A1 (en) | Arc voltage limiter | |
| SU1453507A1 (en) | Arrangement for high-frequency protection of power transmission line | |
| SU1739430A1 (en) | Method of grouped single automatic reclosure | |
| RU2041527C1 (en) | Device for indicating operation of multistage relay protective gear | |
| CN117650479A (en) | Optimization method and device for preventing single-phase grounding protection during parallel operation of multiple pump sets | |
| CN115765418A (en) | Detection method, protection method and protection device for valve triggering fault of hybrid converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150427 Granted publication date: 19991020 |