CN205104889U - Electric power distribution system's discriminative protection device, electric power distribution system - Google Patents
Electric power distribution system's discriminative protection device, electric power distribution system Download PDFInfo
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- CN205104889U CN205104889U CN201520848864.9U CN201520848864U CN205104889U CN 205104889 U CN205104889 U CN 205104889U CN 201520848864 U CN201520848864 U CN 201520848864U CN 205104889 U CN205104889 U CN 205104889U
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Abstract
The utility model relates to an electric power distribution system's discriminative protection device, electric power distribution system. This electric power distribution system's discriminative protection device is including 1 the 1st discriminative protection unit (10) and 1 the 2nd discriminative protection unit (20), the 1st discriminative protection unit (10) include: one first circuit breaker (11), 1 the 1st current transformer (12) and a first shutting logical type discriminative protection device (13), the 2nd discriminative protection unit (20) include: one second circuit breaker (21), 1 the 2nd current transformer (22) and second shutting logical type discriminative protection device (23), wherein, first shutting logical type discriminative protection device (13) judges that it trips and send 1 the 1st control signal with shutting second circuit breaker (21) to second shutting logical type discriminative protection device (23) to control first circuit breaker (11) when major loop (300) take place the short circuit.
Description
Technical field
The utility model relates to the trip protection technical field of electrical power distribution system, particularly relates to discrimination protection and the electrical power distribution system of electrical power distribution system.
Background technology
Electric power system is divided into generating, the large part of transmission and disttrbution three usually.The electric energy that electricity generation system sends, via the conveying of transmission system, finally distributes to each user by distribution system.Usually, this section of system exporting to user side from step-down distribution transformer station (High Voltage Distribution Substations) in electric power system is called distribution system.In electrical power distribution system, be connected in series a plurality of circuit breaker as protection switch the major loop between from electrical network to load, when there being short circuit etc. extremely to occur in major loop, circuit breaker can trip to protect the equipment of user and the safety of the person.The selectivity trip protection of this plurality of circuit breaker can be realized by setting circuit breaker a plurality of in major loop being carried out respectively to hardware parameter.
Utility model content
One of the purpose of this utility model is to provide discrimination protection and the electrical power distribution system of electrical power distribution system, and it can realize the selective protection of circuit breaker at different levels in major loop, avoids the large-area power-cuts that the misoperation because of circuit breaker causes.
An aspect of the present utility model provides the discrimination protection of electrical power distribution system, comprise one first selective protection unit and one second selective protection unit, the second selective protection unit and the first selective protection unit cascaded and be positioned at the upstream of the first selective protection unit;
First selective protection unit comprises:
One first circuit breaker, it is serially connected with in a major loop of electrical power distribution system,
One first current transformer, it detects first main circuit current in the first circuit breaker downstream, and
One first latching logic type discrimination protection, according to the first main circuit current, it judges whether major loop is short-circuited;
Second selective protection unit comprises:
One second circuit breaker, it to be serially connected with in major loop and to be positioned at the upstream of the first circuit breaker,
One second current transformer, it detects the second main circuit current between the first circuit breaker and the second circuit breaker, and
One second latching logic type discrimination protection, according to the second main circuit current, it judges whether major loop is short-circuited;
Wherein, control the first circuit breaker trip when the first latching logic type discrimination protection judges that major loop is short-circuited and send one first control signal with locking second circuit breaker to the second latching logic type discrimination protection.During the first normal operation of circuit breaker, the second circuit breaker can not the large-area power-cuts that causes of misoperation.
In the schematic execution mode of the another kind of discrimination protection; after second circuit breaker lock; whether the first latching logic type discrimination protection detects the first circuit breaker trip successful, and sends one second control signal to control the second circuit breaker trip when the first circuit breaker trip is unsuccessful to the second latching logic type discrimination protection.When first circuit breaker does not normally work, the second circuit breaker plays the second effect heavily protected.
In another schematic execution mode of discrimination protection, locking second circuit breaker when the second latching logic type discrimination protection receives the first control signal; Second latching logic type discrimination protection does not receive the first control signal, but controls the second circuit breaker trip when receiving the second control signal and/or judge that major loop is short-circuited.Second latching logic type discrimination protection can either major loop between independent protective first circuit breaker and the second circuit breaker; misoperation can be avoided when the first normal operation of circuit breaker again, play the second effect heavily protected when the first circuit breaker does not normally work.
In another schematic execution mode of discrimination protection,
First circuit breaker comprises: one first main contact, one first auxiliary contact, and one first shunt opening coil;
Second circuit breaker comprises: one second main contact, and one second shunt opening coil;
First latching logic type discrimination protection comprises:
One first input interface, it receives the first main circuit current from the first current transformer,
One first output interface, it sends one first trip signal to the first shunt opening coil, to control the first main contact and the tripping operation of the first auxiliary contact,
One second input interface, it receives one first switch state signal from the first auxiliary contact,
One second output interface, it sends the first control signal or the second control signal to the second latching logic type discrimination protection, and
One first microprocessing unit, it is respectively at the electrical connection of the first input interface, the first output interface, the second input interface and the second output interface, and judges whether major loop is short-circuited according to the first main circuit current that the first input interface receives;
Second latching logic type discrimination protection comprises:
One the 3rd input interface, it receives the second main circuit current from the second current transformer,
One the 3rd output interface, it sends one second trip signal to the second shunt opening coil, to control the second main contact tripping operation,
One the 4th input interface, it receives the first control signal or the second control signal from the second output interface, and
One second microprocessing unit, according to the second main circuit current that the 3rd input interface receives, it, respectively at the 3rd input interface, the 3rd output interface, the 4th input interface electrical connection, judges whether major loop is short-circuited;
Wherein, when first microprocessing unit judges that major loop is short-circuited by the first output interface to the first shunt opening coil send the first trip signal with control the first main contact and the first auxiliary contact tripping operation and send the first control signal with locking second circuit breaker by the second output interface to the 4th input interface, then the first switch state signal received according to the second input interface judges that whether the first circuit breaker trip is successful, sending second control signal by the second output interface to the 4th input interface when the first circuit breaker trip is unsuccessful makes the second microprocessing unit send the second trip signal by the 3rd output interface to the second shunt opening coil, to control the second main contact tripping operation.The on off state of the first circuit breaker can be detected by the first auxiliary contact, prevent the first circuit breaker from normally not working and causing shielding failure.
In another schematic execution mode of discrimination protection, locking second circuit breaker when the second microprocessing unit receives the first control signal by the 4th input interface; Second microprocessing unit does not receive the first control signal, but sends the second trip signal by the 3rd output interface to the second shunt opening coil when receiving the second control signal and/or judge that major loop is short-circuited, to control the second main contact tripping operation.
In another schematic execution mode of discrimination protection, the first latching logic type discrimination protection is connected by an IEC61850 communication optical fiber with the second latching logic type discrimination protection.Adopt IEC61850 communication optical fiber, realize telecommunication, and optical-fibre communications speed is fast.
Of the present utility modelly another aspect provides electrical power distribution system; comprise: a major loop, it is electrically connected between an electrical network and a load, and above-mentioned discrimination protection; wherein, electrical network, the second circuit breaker, the first circuit breaker and the sense of current of load in major loop are arranged in order.During the first normal operation of circuit breaker, the second circuit breaker can not the large-area power-cuts that causes of misoperation.
Accompanying drawing explanation
Hereafter also come by reference to the accompanying drawings to be further described the above-mentioned characteristic of the utility model, technical characteristic, advantage and implementation thereof by description of a preferred embodiment by clearly understandable mode, wherein:
The structural representation of the electrical power distribution system that Fig. 1 provides for an embodiment of the present utility model;
The structural representation of the electrical power distribution system that Fig. 2 provides for another embodiment of the present utility model.
Label declaration:
100 electrical networks
200 loads
300 major loops
10 first selective protection unit
11 first circuit breakers
111 first main contacts
112 first shunt opening coils
113 first auxiliary contacts
12 first current transformers
13 first latching logic type discrimination protections
130 first microprocessing units
131 first input interfaces
132 first output interfaces
134 second input interfaces
135 second output interfaces
20 second selective protection unit
21 second circuit breakers
211 second main contacts
212 second shunt opening coils
213 second auxiliary contacts
22 second current transformers
23 second latching logic type discrimination protections
230 second microprocessing units
231 the 3rd input interfaces
232 the 3rd output interfaces
233 the 4th input interfaces
234 the 5th input interfaces
235 the 5th output interfaces
30 the 3rd selective protection unit
31 the 3rd circuit breakers
311 the 3rd main contacts
312 the 3rd shunt opening coils
32 the 3rd current transformers
33 the 3rd latching logic type discrimination protections
330 the 3rd microprocessing units
331 the 6th input interfaces
332 the 6th output interfaces
333 the 7th input interfaces
The I sense of current
Embodiment
In order to the technical characteristic to utility model, object and effect have understanding clearly, now contrast accompanying drawing and embodiment of the present utility model is described, label identical in the various figures represents identical part.
Each figure discussed below and be used to the principle of the present disclosure be described in this patent file various embodiments only by way of illustration and in no case should be construed as limiting the scope of the present disclosure.It will be understood to those of skill in the art that and can implement principle of the present disclosure in the equipment of any suitable layout.The various innovative teachings of the application are described with reference to exemplary non-limiting embodiments.
In this article, " schematically " expression " serves as example, example or explanation ", not should by being described to any diagram of " schematically " in this article, execution mode is interpreted as a kind of preferred or have more the technical scheme of advantage.
For making simplified form, only schematically show the part relevant to the utility model in each figure, they do not represent its practical structures as product.In addition, be convenient to make simplified form understand, there are the parts of same structure or function in some figure, schematically show only one of them, or only marked one of them.
In this article, along sense of current in the major loop of electrical power distribution system, electrical network is positioned at source, load is positioned at end, is " upstream " near electrical network, and be " downstream " near load, " upstream " and " downstream " are the relative position relations on circuit is connected.
The structural representation of the electrical power distribution system that Fig. 1 provides for an embodiment of the present utility model.As can be seen from Figure 1, this electrical power distribution system, comprising:
One major loop 300, it is electrically connected between an electrical network 100 and a load 200, and a discrimination protection (not identifying in figure).
The discrimination protection of this electrical power distribution system, comprises one first selective protection unit 10 and one second selective protection unit 20.Second selective protection unit 20 and the first selective protection unit 10 cascade are also positioned at the upstream of the first selective protection unit 10.
First selective protection unit 10 comprises:
One first circuit breaker 11, it is serially connected with in the major loop 300 of electrical power distribution system,
One first current transformer 12, it detects first main circuit current of the first circuit breaker 11 downstream (namely between the first circuit breaker 11 and load 200), and
One first latching logic type discrimination protection 13, according to the first main circuit current, it judges whether major loop 300 is short-circuited.
Second selective protection unit 20 comprises:
One second circuit breaker 21, it to be serially connected with in major loop 300 and to be positioned at the upstream of the first circuit breaker 11,
One second current transformer 22, it detects the second main circuit current between the first circuit breaker 11 and the second circuit breaker 21, and
One second latching logic type discrimination protection 23, according to the second main circuit current, it judges whether major loop 300 is short-circuited.
Wherein, the first latching logic type discrimination protection 13 judges that major loop 300 controls the first circuit breaker 11 and trips and send one first control signal with locking second circuit breaker 21 to the second latching logic type discrimination protection 23 when being short-circuited.Like this, no matter the judged result whether the second latching logic type discrimination protection 23 pairs of major loops 300 are short-circuited, the second circuit breaker 21 all can not trip.That is, when the first circuit breaker 11 normally works, the second circuit breaker 21 can not the large-area power-cuts that causes of misoperation.
In a schematic execution mode, the first latching logic type discrimination protection and the second latching logic type discrimination protection all adopt relay.
After second circuit breaker 21 locking; whether the first latching logic type discrimination protection 13 detects the first circuit breaker 11 and trips successful, sends one second control signal trip to control the second circuit breaker 21 when the first circuit breaker 11 trips unsuccessful to the second latching logic type discrimination protection 23.When the first circuit breaker does not normally work, the second circuit breaker plays the second effect heavily protected.
Locking second circuit breaker 21 when second latching logic type discrimination protection 23 receives the first control signal; Second latching logic type discrimination protection 23 does not receive the first control signal, but receives the second control signal and/or judge that major loop 300 controls the second circuit breaker 21 and trips when being short-circuited.Second latching logic type discrimination protection can either major loop between independent protective first circuit breaker and the second circuit breaker; misoperation can be avoided when the first normal operation of circuit breaker again, play the second effect heavily protected when the first circuit breaker does not normally work.
Electrical network 100, second circuit breaker 21, first circuit breaker 11 and the sense of current I of load 200 in major loop 300 are arranged in order.Second circuit breaker 21, first circuit breaker 11 is protected this major loop jointly.In a schematic execution mode, the voltage of this electrical network is 690 volts.In a schematic execution mode, the second circuit breaker 21 is 480 volts of circuit breakers.In a schematic execution mode, the first circuit breaker 11 is 230 volts of circuit breakers.In a schematic execution mode, between the first circuit breaker 11 and the second circuit breaker 21, be also connected in series a transformer (not shown).
In a schematic execution mode, the first circuit breaker 11 comprises: one first main contact 111, one first auxiliary contact 113, and one first shunt opening coil 112.Second circuit breaker 21 comprises: one second main contact 211, and one second shunt opening coil 212.
First latching logic type discrimination protection 13 comprises:
One first input interface 131, it receives the first main circuit current from the first current transformer 12,
One first output interface 132, it sends one first trip signal to the first shunt opening coil 112, to control the first main contact 111 and the first auxiliary contact 113 trips,
One second input interface 134, it receives one first switch state signal from the first auxiliary contact 113,
One second output interface 135, it sends the first control signal or the second control signal to the second latching logic type discrimination protection 23, and
One first microprocessing unit 130, it is electrically connected respectively at the first input interface 131, first output interface 132, second input interface 134 and the second output interface 135, and judges whether major loop 300 is short-circuited according to the first main circuit current that the first input interface 131 receives.
Second latching logic type discrimination protection 23 comprises:
One the 3rd input interface 231, it receives the second main circuit current from the second current transformer 22,
One the 3rd output interface 232, it sends one second trip signal to the second shunt opening coil 212, trips to control the second main contact 211,
One the 4th input interface 233, it receives the first control signal or the second control signal from the second output interface 135, and
One second microprocessing unit 230, it is electrically connected respectively at the 3rd input interface 231, the 3rd output interface 232, the 4th input interface 233, judges whether major loop 300 is short-circuited according to the second main circuit current that the 3rd input interface 231 receives.
Wherein, the first trip signal is sent to control the first main contact 111 and the first auxiliary contact 113 trips and sends the first control signal with locking second circuit breaker 21 by the second output interface 135 to the 4th input interface 233 by the first output interface 132 to the first shunt opening coil 112 when first microprocessing unit 130 judges that major loop 300 is short-circuited, then the first switch state signal received according to the second input interface 134 judges whether the first circuit breaker 11 trips successful, sending second control signal by the second output interface 135 to the 4th input interface 233 when the first circuit breaker 11 trips unsuccessful makes the second microprocessing unit 230 send the second trip signal by the 3rd output interface 232 to the second shunt opening coil 212, trip to control the second main contact 211.
Locking second circuit breaker when second microprocessing unit 230 receives the first control signal by the 4th input interface 233; Second microprocessing unit does not receive the first control signal, but send the second trip signal by the 3rd output interface 232 to the second shunt opening coil 212 when receiving the second control signal and/or judge that major loop 300 is short-circuited, trip to control the second main contact 211.
The on off state of the first circuit breaker can be detected by the first auxiliary contact, prevent the first circuit breaker from normally not working and causing shielding failure.
In a schematic execution mode, the first latching logic type discrimination protection 10 is connected by an IEC61850 communication optical fiber with the second latching logic type discrimination protection 20.IEC61850 optical fiber carries out communication, improves the speed of communication, realizes telecommunication.
Such as, if the A point in Fig. 1 is short-circuited, the first main circuit current that the first current transformer 12 detects changes because of the short circuit of A point.First latching logic type discrimination protection 13 receives the first main circuit current by the first input interface 131 from the first current transformer 12.According to the first main circuit current that the first input interface 131 receives, first microprocessing unit 130 judges that major loop 300 is short-circuited.Such as, the change of certain moment first main circuit current generation exceedes the threshold value preset, then judge that this major loop 300 is short-circuited.First microprocessing unit 130 sends the first trip signal to control the intertrip together with the first auxiliary contact 113 of the first main contact 111 by the first output interface 132 to the first shunt opening coil 112; And send the first control signal by the second output interface 135 to the 4th input interface 233, with locking second circuit breaker 21 simultaneously.In a schematic execution mode, when the second microprocessing unit 230 receives the first control signal by the 4th input interface 233, do not send any signal to the second circuit breaker 21, to realize locking second circuit breaker 21.Now, A point is short-circuited and the second main circuit current of B point (major loop namely between the first circuit breaker 11 and the second circuit breaker 12) also may be made to change, thus is detected by the second current transformer 22.Second microprocessing unit 230 receives the second main circuit current from the 3rd input interface 231, and may judge major loop 300 by accident and be short-circuited.If now the second microprocessing unit 230 does not receive the first control signal, send second trip signal by the 3rd output interface 232 to the second shunt opening coil 212 with regard to possible errors, and then the second main contact 211 is tripped, cause large-area power failure.In embodiment of the present utility model, now the second microprocessing unit 230 receives the first control signal, and by the second circuit breaker 21 locking, the second circuit breaker 21 is not tripped.Here, the priority of the first control signal, higher than according to the priority of the second main circuit current to the major loop whether judged result of short circuit, even if judged B point by accident to produce short circuit, also can not make the second circuit breaker 21 trip, thus avoid large-area power failure.
From the foregoing, when A point is short-circuited, the first circuit breaker 11 trips, and is disconnected by the major loop between the first circuit breaker 11 and load 200, protection load 200.Meanwhile, the second circuit breaker 21 is blocked, and the major loop between the first circuit breaker 11 and the second circuit breaker 21 can not disconnect, and avoids large-area power failure.
In actual application, the first circuit breaker 11 can exist and have received the first trip signal but the successful situation that could not trip from the first output interface 132, contact melted contact adhesion such as occurring or causes because of short circuit.In embodiment of the present utility model, the first auxiliary contact 113 in the first circuit breaker 11 and the first main contact 111 link, and the first auxiliary contact 113 can produce digital quantity signal, i.e. the first switch state signal, to show the on off state of the first circuit breaker 11.This first switch state signal is received by the second input interface 134.Therefore, the first switch state signal that the first microprocessing unit 130 can receive according to the second input interface 134 judges whether the first circuit breaker 11 trips successful.
When the first circuit breaker 11 trips successful, the first latching logic type discrimination protection 13 does not send any signal to the second latching logic type discrimination protection 23, and the second circuit breaker 21 is not tripped.The short circuit occurring in A point so only affects the major loop between the first circuit breaker 11 and load 200, and the major loop between the first circuit breaker 11 and the second circuit breaker 21 is not by this Effect of Short Circuit.Achieve the selective protection of the major loop of electrical power distribution system, avoid large-area power-cuts.
When the first circuit breaker 11 trips unsuccessful, the first microprocessing unit 130 sends the second control signal by the second output interface 135 to the 4th input interface 233.Second microprocessing unit 230 sends the second trip signal by the 3rd output interface 232 to the second shunt opening coil 212 after receiving this second control signal by the 4th input interface 233, trips to control the second main contact 211.At one time, the first microprocessing unit 130 to send one in the first control signal and the second control signal to the 4th input interface 233 by the second output interface 135, can not send simultaneously.Like this, if A point is short-circuited, even if the first circuit breaker 11 could not trip successfully, the second circuit breaker 21 also can trip, and serves duplicate protection, enhances the safeguard protection to equipment and the person.
Certainly, when A point is not short-circuited, the first microprocessing unit 130 does not send the first control signal or the second control signal to the second microprocessing unit 230.If now B point is short-circuited, the second main circuit current changes, and is detected by the second current transformer 22.According to the second main circuit current received from the 3rd input interface 231, second microprocessing unit 230 judges that major loop 300 is short-circuited.Second microprocessing unit 230 sends the second trip signal by the 3rd output interface 232 to the second shunt opening coil 212, and then the second main contact 211 is tripped.Such second circuit breaker 21 serves separately the protection to the major loop between the first circuit breaker 11 and the second circuit breaker 21.
To sum up, the short circuit that the major loop 300 between the first circuit breaker 11 and load 200 occurs, is protected by the first circuit breaker 11.The short circuit that major loop 300 between second circuit breaker 21 and the first circuit breaker 21 occurs, is protected by the second circuit breaker 21.When first circuit breaker 11 normally works, the second circuit breaker 21 can not produce misoperation, can not cause large-area power-cuts.When first circuit breaker 11 fails normally to work, the second circuit breaker 21 plays the second effect heavily protected.That is, achieve the selective protection of killer switch at different levels in major loop, avoid the large-area power-cuts that the misoperation because of killer switch causes.
The structural representation of the electrical power distribution system that Fig. 2 provides for another embodiment of the present utility model.As can be seen from Figure 2, this embodiment is on the basis of the embodiment shown in Fig. 1, and the discrimination protection of this electrical power distribution system comprises the 3rd selective protection unit 30 being positioned at the second selective protection unit 20 upstream further.In Fig. 2 and Fig. 1 something in common no longer repeat set forth, below emphasis set forth difference.
Second circuit breaker 21 also comprises one second auxiliary contact 213.Second latching logic type discrimination protection 23 also comprises: one the 5th input interface 234; it receives a second switch status signal from the second auxiliary contact 213; with one the 5th output interface 235, it sends the 3rd control signal or the 4th control signal to the 3rd latching logic type discrimination protection 33.
The second selective protection unit 20 in the 26S Proteasome Structure and Function of the 3rd selective protection unit 30 and Fig. 1 is similar, and its structure is as follows:
3rd selective protection unit 30 comprises:
One the 3rd circuit breaker 31, it to be serially connected with in major loop 300 and to be positioned at the upstream of the second circuit breaker 21,
One the 3rd current transformer 32, it detects the 3rd main circuit current between the second circuit breaker 21 and the 3rd circuit breaker 31, and
One the 3rd latching logic type discrimination protection 33, according to the 3rd main circuit current, it judges whether major loop 300 is short-circuited.
3rd circuit breaker 31 comprises: one the 3rd main contact 311, and one the 3rd shunt opening coil 312.
3rd latching logic type discrimination protection 33 comprises:
One the 6th input interface 331, it receives the 3rd main circuit current from the 3rd current transformer 32,
One the 6th output interface 332, it sends one the 3rd trip signal to the 3rd shunt opening coil 212, trips to control the 3rd main contact 311,
One the 7th input interface 333, it receives the 3rd control signal or the 4th control signal from the 5th output interface 235, and
One the 3rd microprocessing unit 330, it is electrically connected respectively at the 6th input interface 331, the 6th output interface 332, the 7th input interface 333, judges whether major loop 300 is short-circuited according to the 3rd main circuit current that the 6th input interface 331 receives.
The second trip signal is sent to control the second main contact 211 and the second auxiliary contact 213 trips and sends the 3rd control signal with locking the 3rd circuit breaker 31 by the 5th output interface 235 to the 7th input interface 333 by the 3rd output interface 232 to the second shunt opening coil 212 when second microprocessing unit 230 judges that major loop 300 is short-circuited or receives the second control signal from the first microprocessing unit 130, then the second switch status signal received according to the 5th input interface 234 judges whether the second circuit breaker 21 trips successful, sending four control signal by the 5th output interface 235 to the 7th input interface 333 when the second circuit breaker 21 trips unsuccessful makes the 3rd microprocessing unit 330 send the 3rd trip signal by the 6th output interface 332 to the 3rd shunt opening coil 312, trip to control the 3rd main contact 311.
Locking the 3rd circuit breaker 31 when 3rd microprocessing unit 330 receives the 3rd control signal by the 7th input interface 333; 3rd microprocessing unit 330 does not receive the 3rd control signal, but send the 3rd trip signal by the 6th output interface 332 to the 3rd shunt opening coil 312 when receiving the 4th control signal and/or judge that major loop 300 is short-circuited, trip to control the 3rd main contact 211.
In a schematic execution mode, the second latching logic type discrimination protection 20 is connected by an IEC61850 communication optical fiber with the 3rd latching logic type discrimination protection 30.
In a schematic execution mode, the 4th input interface 233 and the 5th output interface 235 integrate.
In like manner; in a schematic execution mode, the discrimination protection of electrical power distribution system can also comprise be positioned at the 3rd selective protection unit upstream and the 4th selective protection unit be arranged in order, the 5th selective protection unit ..., N selective protection unit.Now, the structure of the 1st selective protection unit is identical with the first selective protection cellular construction in Fig. 2; The structure of the n-th selective protection unit is identical with the second selective protection cellular construction in Fig. 2,2≤n≤N-1; The structure of N selective protection unit is identical with the 3rd selective protection cellular construction in Fig. 2, N >=3; No longer repeat to set forth.
Be to be understood that, although this specification describes according to each execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each execution mode also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
A series of detailed description listed is above only illustrating for possible embodiments of the present utility model; they are also not used to limit protection range of the present utility model, all do not depart from the utility model skill Equivalent embodiments of doing of spirit or change all should be included within protection range of the present utility model.
Claims (7)
1. the discrimination protection of electrical power distribution system, it is characterized in that, comprise one first selective protection unit (10) and one second selective protection unit (20), described second selective protection unit (20) and described first selective protection unit (10) cascade are also positioned at the upstream of described first selective protection unit (10);
Described first selective protection unit (10) comprising:
One first circuit breaker (11), it is serially connected with in a major loop (300) of described electrical power distribution system,
One first current transformer (12), it detects first main circuit current in described first circuit breaker (11) downstream, and
One first latching logic type discrimination protection (13), according to described first main circuit current, it judges whether described major loop (300) is short-circuited;
Described second selective protection unit (20) comprising:
One second circuit breaker (21), it to be serially connected with in described major loop (300) and to be positioned at the upstream of described first circuit breaker (11),
One second current transformer (22), it detects the second main circuit current between described first circuit breaker (11) and the second circuit breaker (21), and
One second latching logic type discrimination protection (23), according to described second main circuit current, it judges whether described major loop (300) is short-circuited;
Wherein, described first latching logic type discrimination protection (13) judges that described major loop (300) controls the tripping operation of described first circuit breaker (11) and sends one first control signal with the second circuit breaker (21) described in locking to described second latching logic type discrimination protection (23) when being short-circuited.
2. discrimination protection according to claim 1; it is characterized in that; after the locking of described second circuit breaker (21); whether described first latching logic type discrimination protection (13) detects the tripping operation of described first circuit breaker (11) successful, and sends one second control signal to control the tripping operation of described second circuit breaker (21) when described first circuit breaker (11) is tripped unsuccessful to described second latching logic type discrimination protection (23).
3. discrimination protection according to claim 2, is characterized in that, the second circuit breaker (21) described in locking when described second latching logic type discrimination protection (23) receives described first control signal; Described second latching logic type discrimination protection (23) does not receive described first control signal, but receives described second control signal and/or judge that described major loop (300) controls the tripping operation of described second circuit breaker (21) when being short-circuited.
4. discrimination protection according to claim 2, is characterized in that,
Described first circuit breaker (11) comprising: one first main contact (111), one first auxiliary contact (113), and one first shunt opening coil (112); Described second circuit breaker (21) comprising: one second main contact (211), and one second shunt opening coil (212);
Described first latching logic type discrimination protection (13) comprising:
One first input interface (131), it receives described first main circuit current from described first current transformer (12),
One first output interface (132), it sends one first trip signal to described first shunt opening coil (112), to control described first main contact (111) and described first auxiliary contact (113) tripping operation,
One second input interface (134), it receives one first switch state signal from described first auxiliary contact (113),
One second output interface (135), it sends described first control signal or the second control signal to described second latching logic type discrimination protection (23), and
One first microprocessing unit (130), according to described first main circuit current that described first input interface (131) receives, it respectively at described first input interface (131), the first output interface (132), the second input interface (134) and the second output interface (135) electrical connection, and judges whether described major loop (300) is short-circuited;
Described second latching logic type discrimination protection (23) comprising:
One the 3rd input interface (231), it receives described second main circuit current from described second current transformer (22),
One the 3rd output interface (232), it sends one second trip signal to described second shunt opening coil (212), to control the tripping operation of described second main contact (211),
One the 4th input interface (233), it receives described first control signal or the second control signal from described second output interface (135), and
One second microprocessing unit (230), according to described second main circuit current that described 3rd input interface (231) receives, it, respectively at described 3rd input interface (231), the 3rd output interface (232), the 4th input interface (233) electrical connection, judges whether described major loop (300) is short-circuited;
Wherein, described first trip signal is sent to control described first main contact (111) and described first auxiliary contact (113) trips and sends described first control signal with the second circuit breaker (21) described in locking by described second output interface (135) to described 4th input interface (233) by described first output interface (132) to described first shunt opening coil (112) when described first microprocessing unit (130) judges that described major loop (300) is short-circuited, then described first switch state signal received according to described second input interface (134) judges that whether the tripping operation of described first circuit breaker (11) is successful, sending described second control signal by described second output interface (135) to described 4th input interface (233) when described first circuit breaker (11) is tripped unsuccessful makes described second microprocessing unit (230) send described second trip signal by described 3rd output interface (232) to described second shunt opening coil (212), to control the tripping operation of described second main contact (211).
5. discrimination protection according to claim 4, it is characterized in that, the second circuit breaker (21) described in locking when described second microprocessing unit (230) receives described first control signal by described 4th input interface (233); Described second microprocessing unit (230) does not receive described first control signal, but send described second trip signal by described 3rd output interface (232) to described second shunt opening coil (212) when receiving described second control signal and/or judge that described major loop (300) is short-circuited, to control the tripping operation of described second main contact (211).
6. discrimination protection according to claim 1; it is characterized in that, described first latching logic type discrimination protection (13) is connected by an IEC61850 communication optical fiber with described second latching logic type discrimination protection (23).
7. electrical power distribution system, is characterized in that, comprising:
One major loop (300), it is electrically connected between an electrical network (100) and a load (200), and
Discrimination protection as described in any one of claim 1-6,
Wherein, described electrical network (100), described second circuit breaker (21), described first circuit breaker (11) and described load (200) sense of current (I) in described major loop (300) is arranged in order.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2619306A (en) * | 2022-05-30 | 2023-12-06 | Eaton Intelligent Power Ltd | Arrangement with circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2619306A (en) * | 2022-05-30 | 2023-12-06 | Eaton Intelligent Power Ltd | Arrangement with circuit breaker |
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