CN217388210U - Single-phase grounded relay protection device of outlet bin cable terminal - Google Patents
Single-phase grounded relay protection device of outlet bin cable terminal Download PDFInfo
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- CN217388210U CN217388210U CN202221209834.XU CN202221209834U CN217388210U CN 217388210 U CN217388210 U CN 217388210U CN 202221209834 U CN202221209834 U CN 202221209834U CN 217388210 U CN217388210 U CN 217388210U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The utility model discloses a single-phase ground connection's of storehouse cable termination relay protection device of being qualified for next round of competitions, feeder three phase current collection module's output, feeder circuit breaker position collection module's output, storehouse arc light intensity collection module's output is qualified for the next round of competitions, the output of protection input signal collection module and generating line zero sequence voltage collection module's output are connected with the input of logic operation circuit, logic operation circuit's output is connected with alarm signal output module's input and feeder circuit breaker trip control module's input, feeder circuit breaker trip control module's output is connected with the control end of feeder circuit breaker among the distribution system, the device can be when the storehouse cable termination of being qualified for the next round of competitions takes place single-phase ground fault, reliable, the feeder circuit breaker of sensitive tripping fault cable, guarantee unit steady operation.
Description
Technical Field
The utility model belongs to the technical field of power system relay protection, a be qualified for the next round of competitions single-phase ground connection's of storehouse cable termination relay protection device is related to.
Background
The large-scale generating set auxiliary power system mostly adopts a small-resistance grounding mode, a neutral point on a low-voltage side of a high-voltage auxiliary transformer is grounded through a small-resistance mode, single-phase metallic grounding current of the auxiliary power system is about 100-600A, 6kV or 10kV voltage level, and single-phase grounding protection has good selectivity and high sensitivity. According to DL/T1502 guidance for setting and calculating relay protection for station service, for a station service system with a neutral point grounded through a small resistor and an outlet mode of single-phase grounding protection at the low-voltage side of a high-voltage station transformer, one time limit of zero-sequence overcurrent protection acts on tripping a branch circuit breaker and locking a standby power supply for switching, and two time limits of zero-sequence overcurrent protection act on stopping and starting the standby power supply for switching.
At present, referring to fig. 1, in a power distribution system, a feeder of a low-voltage side bus section of a transformer for a high-voltage plant of a large-scale generator set adopts a cable mode, and single-phase grounding protection of the feeder cable is realized by adopting a comprehensive protection device externally connected with a zero-sequence current transformer. The cable terminal is positioned in an outlet bin between the zero sequence current transformer and the feeder line breaker, single-phase earth fault occurs at the cable terminal, the interval zero sequence earth protection does not act, zero sequence overcurrent protection of the branch inlet line breaker at the low-voltage side bus section of the high-voltage station transformer acts for a time limit, the branch breaker is tripped, the standby power supply is locked for switching, and the low-voltage side bus section of the high-voltage station transformer has power failure in the whole section, thereby endangering the stable operation of a unit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a storehouse cable termination single-phase ground connection's relay protection device is qualified for the next round of competitions, the device can be when the storehouse cable termination that is qualified for the next round of competitions takes place single-phase ground fault, and reliable, sensitive jump off fault cable's feeder circuit breaker guarantees unit steady operation.
In order to achieve the purpose, the single-phase grounding relay protection device of the outlet bin cable terminal comprises an acquisition unit, a logic operation circuit, an upper computer, an alarm signal output module and a feeder circuit breaker tripping control module;
the acquisition unit comprises a feeder three-phase current acquisition module for acquiring feeder three-phase current in the power distribution system, a feeder breaker position acquisition module for acquiring the position of a feeder breaker in the power distribution system, a wire outlet bin arc light intensity acquisition module for acquiring the arc light intensity of a wire outlet bin, a protection input signal acquisition module for acquiring a protection input signal and a bus zero-sequence voltage acquisition module for acquiring bus zero-sequence voltage in the power distribution system;
the output end of the feeder three-phase current acquisition module, the output end of the feeder breaker position acquisition module, the output end of the outlet bin arc light intensity acquisition module, the output end of the protection input signal acquisition module and the output end of the bus zero sequence voltage acquisition module are connected with the input end of a logic operation circuit, the output end of the logic operation circuit is connected with the input end of an alarm signal output module and the input end of the feeder breaker tripping control module, and the output end of the feeder breaker tripping control module is connected with the control end of a feeder breaker in a power distribution system.
The feeder zero sequence current acquisition module is used for acquiring feeder zero sequence current in a power distribution system.
The feeder line breaker trip control system further comprises an upper computer, and the alarm signal output module, the feeder line breaker trip control module and the feeder line zero sequence current acquisition module are connected with the upper computer.
The logic operation circuit comprises a function module, a first comparison module, a second comparison module, a first AND gate module, a second AND gate module, a third comparison module and an OR gate module;
the output end of the feeder line three-phase current acquisition module is connected with the input end of the function module, the output end of the function module is connected with the input end of the first comparison module, the output end of the outlet bin arc light intensity acquisition module is connected with the input end of the second comparison module, and the output end of the first comparison module, the output end of the feeder line breaker position acquisition module and the output end of the second comparison module are connected with the input end of the first AND gate module;
the output end of the bus zero sequence voltage acquisition module is connected with the input end of a third comparison module, the output end of the third comparison module and the output end of the bus zero sequence voltage input pressing plate state acquisition module are connected with the input end of an OR gate module, the output end of the OR gate module and the output end of a first AND gate module are connected with the input end of a second AND gate module, the output end of the second AND gate module is connected with the input end of an alarm signal output module and the input end of the third AND gate module, the output end of the protection input signal acquisition module is connected with the input end of the third AND gate module, the output end of the third AND gate module is connected with the input end of a feeder circuit breaker tripping control module, and the output end of the feeder circuit breaker tripping control module is connected with the control end of a feeder circuit breaker in a power distribution system.
The utility model discloses following beneficial effect has:
the single-phase ground connection's of storehouse cable termination relay protection device of being qualified for the next round of competitions when concrete operation, whether take place single-phase earth fault based on feeder three-phase current among the distribution system, feeder circuit breaker's position, the arc light intensity in storehouse of being qualified for the next round of competitions, protection input signal and generating line zero sequence voltage judgement, when taking place single-phase earth fault, jump the feeder circuit breaker of fault cable, the power failure range limits in the fault cable interval to guarantee unit steady operation, simple structure, convenient operation, the practicality is extremely strong.
Drawings
FIG. 1 is a schematic diagram of a power distribution system;
FIG. 2 is a schematic view of the present invention;
fig. 3 is a schematic diagram of the logic operation circuit 8 according to the present invention.
The system comprises a collecting unit 1, a feeder three-phase current collecting module 2, a feeder zero-sequence current collecting module 3, a feeder breaker position collecting module 4, an outlet bin arc light intensity collecting module 5, a protection input signal collecting module 6, a bus zero-sequence voltage collecting module 7, a logic operation circuit 8, a bus zero-sequence voltage input pressing plate state collecting module 9, a function module 10, a first comparison module 11, a second comparison module 12, a third comparison module 13, an OR gate module 14, a first AND gate module 15, a second AND gate module 16, a third AND gate module 17, an alarm signal output module 18 and a feeder breaker tripping control module 19.
Detailed Description
In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments, and do not limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
A schematic structural diagram according to an embodiment of the present disclosure is shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and some details may be omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 2, the single-phase grounded relay protection device of the outlet bin cable terminal of the present invention includes an acquisition unit 1, a logic operation circuit 8, an upper computer, an alarm signal output module 18 and a feeder breaker trip control module 19;
the collection unit 1 comprises a feeder line three-phase current collection module 2, a feeder line zero-sequence current collection module 3, a feeder line breaker position collection module 4, a wire outlet bin arc light intensity collection module 5, a protection input signal collection module 6 and a bus zero-sequence voltage collection module 7;
the feeder three-phase current in the power distribution system is collected through a feeder three-phase current collection module 2;
the feeder zero sequence current in the power distribution system is collected through a feeder zero sequence current collection module 3;
the position of a feeder circuit breaker in a power distribution system is acquired through a feeder circuit breaker position acquisition module 4;
the arc light intensity of the wire outlet bin is collected through an arc light intensity collecting module 5 of the wire outlet bin;
a protection input signal is acquired through a protection input signal acquisition module 6 and is used for judging whether a protection function is input;
acquiring bus zero-sequence voltage in a power distribution system through a bus zero-sequence voltage acquisition module 7;
the output ends of the feeder line three-phase current acquisition module 2, the feeder line zero sequence current acquisition module 3, the feeder line breaker position acquisition module 4, the outlet bin arc light intensity acquisition module 5, the protection input signal acquisition module 6 and the bus zero sequence voltage acquisition module 7 are connected with the input end of the logic operation circuit 8, and the output end of the logic operation circuit 8 is connected with the upper computer, the input end of the alarm signal output module 18 and the input end of the feeder line breaker tripping control module 19.
Referring to fig. 3, the logic operation circuit 8 includes a function module 10, a first comparison module 11, a second comparison module 12, a first and gate module 15, a second and gate module 16, a third and gate module 17, a third comparison module 13, an or gate module 14, an alarm signal output module 18, and a feeder breaker trip control module 19;
the output end of the feeder line three-phase current acquisition module 2 is connected with the input end of a function module 10, the output end of the function module 10 is connected with the input end of a first comparison module 11, the output end of an outgoing line bin arc light intensity acquisition module 5 is connected with the input end of a second comparison module 12, and the output end of the first comparison module 11, the output end of the feeder line breaker position acquisition module 4 and the output end of the second comparison module 12 are connected with the input end of a first and gate module 15;
the output end of the bus zero sequence voltage acquisition module 7 is connected with the input end of a third comparison module 13, the output end of the third comparison module 13 and the output end of the bus zero sequence voltage input pressing plate state acquisition module 9 are connected with the input end of an OR gate module 14, the output end of the OR gate module 14 and the output end of a first AND gate module 15 are connected with the input end of a second AND gate module 16, the output end of the second AND gate module 16 is connected with the input end of an alarm signal output module 18 and the input end of a third AND gate module 17, the output end of a protection input signal acquisition module 6 is connected with the input end of the third AND gate module 17, the output end of the third AND gate module 17 is connected with the input end of a feeder circuit breaker tripping control module 19, and the output end of the feeder circuit breaker tripping control module 19 is connected with the control end of a feeder circuit breaker in a power distribution system.
The logic operation circuit 8 has the following operation logic:
1) function module 10 is based on the three-phase current I of the feeder in the distribution system A 、I B And I C Calculating the three-phase current vector sum of the three-phase current flowing through the feeder circuit breaker 3I 0 ＝I A +I B +I C Judging whether the amplitude value is larger than the fixed value of the single-phase grounding short-circuit current or not through a first comparison module 11;
2) judging whether the arc light intensity of the feeder outlet bin is greater than the set light intensity through a second comparison module 12;
3) the feeder circuit breaker is positioned at the closing position;
4) the third comparison module 13 is used for judging the bus zero sequence voltage 3U 0 Whether the voltage is larger than the fixed value of the single-phase grounding short circuit voltage or not;
5) when the bus zero sequence voltage is input into the pressing plate, the steps 1), 2), 3) and 4) meet the requirements, the protection function is input into the pressing plate, and the feeder line breaker trips;
6) when the bus zero sequence voltage input pressing plate is withdrawn, the steps 1), 2) and 3) meet the requirements, the protection function input pressing plate is put into operation, and the feeder line breaker is tripped.
Claims (8)
1. The single-phase grounding relay protection device of the cable terminal of the outgoing line bin is characterized by comprising an acquisition unit (1), a logic operation circuit (8), an upper computer, an alarm signal output module (18) and a feeder circuit breaker tripping control module (19);
the collection unit (1) comprises a feeder three-phase current collection module (2) for collecting feeder three-phase current in a power distribution system, a feeder breaker position collection module (4) for collecting the position of a feeder breaker in the power distribution system, a wire outlet bin arc light intensity collection module (5) for collecting the arc light intensity of a wire outlet bin, a protection input signal collection module (6) for obtaining a protection input signal and a bus zero-sequence voltage collection module (7) for obtaining bus zero-sequence voltage in the power distribution system;
the output end of the feeder line three-phase current acquisition module (2), the output end of the feeder line breaker position acquisition module (4), the output end of the outlet bin arc light intensity acquisition module (5), the output end of the protection input signal acquisition module (6) and the output end of the bus zero sequence voltage acquisition module (7) are connected with the input end of the logic operation circuit (8), the output end of the logic operation circuit (8) is connected with the input end of the alarm signal output module (18) and the input end of the feeder line breaker tripping control module (19), and the output end of the feeder line breaker tripping control module (19) is connected with the control end of a feeder line breaker in a power distribution system.
2. The single-phase grounded relay protection device of the outlet bin cable terminal according to claim 1, further comprising a feeder zero sequence current collecting module (3) for collecting a feeder zero sequence current in the distribution system.
3. The single-phase grounded relay protection device of the outlet bin cable terminal according to claim 1, further comprising an upper computer, wherein the alarm signal output module (18), the feeder line breaker trip control module (19) and the feeder line zero sequence current acquisition module (3) are connected with the upper computer.
4. The single-phase grounding relay protection device of the outlet bin cable terminal according to claim 1, wherein the logic operation circuit (8) comprises a function module (10), a first comparison module (11), a second comparison module (12), a first AND gate module (15), a second AND gate module (16), a third AND gate module (17), a third comparison module (13) and an OR gate module (14);
the output end of the feeder line three-phase current acquisition module (2) is connected with the input end of the function module (10), the output end of the function module (10) is connected with the input end of the first comparison module (11), the output end of the outlet bin arc light intensity acquisition module (5) is connected with the input end of the second comparison module (12), and the output end of the first comparison module (11), the output end of the feeder line breaker position acquisition module (4) and the output end of the second comparison module (12) are connected with the input end of the first AND gate module (15);
the output end of the bus zero sequence voltage acquisition module (7) is connected with the input end of a third comparison module (13), the output end of the third comparison module (13) and the output end of the bus zero sequence voltage input pressing plate state acquisition module (9) are connected with the input end of an OR gate module (14), the output end of the OR gate module (14) and the output end of the first AND gate module (15) are connected with the input end of the second AND gate module (16), the output end of the second AND gate module (16) is connected with the input end of the alarm signal output module (18) and the input end of the third AND gate module (17), the output end of the protection input signal acquisition module (6) is connected with the input end of the third AND gate module (17), the output end of the third AND gate module (17) is connected with the input end of the feeder circuit breaker tripping control module (19), and the output end of the feeder circuit breaker tripping control module (19) is connected with the control end of the feeder circuit breaker in the power distribution system.
5. The single-phase grounding relay protection device of the cable terminal of the outlet bin as claimed in claim 1, wherein the feeder three-phase current in the power distribution system is collected by a feeder three-phase current collection module (2).
6. The single-phase grounded relay protection device of the cable outlet bin terminal according to claim 1, wherein the feeder zero sequence current in the distribution system is collected by a feeder zero sequence current collection module (3).
7. The single-phase grounded relay protection device of the outlet bin cable terminal of claim 1, wherein the position of the feeder breaker in the power distribution system is collected by the feeder breaker position collection module (4).
8. The single-phase grounded relay protection device of the outlet bin cable terminal of claim 1, wherein the arc intensity of the outlet bin is collected by the outlet bin arc light intensity collecting module (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221209834.XU CN217388210U (en) | 2022-05-19 | 2022-05-19 | Single-phase grounded relay protection device of outlet bin cable terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221209834.XU CN217388210U (en) | 2022-05-19 | 2022-05-19 | Single-phase grounded relay protection device of outlet bin cable terminal |
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| Publication Number | Publication Date |
|---|---|
| CN217388210U true CN217388210U (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221209834.XU Active CN217388210U (en) | 2022-05-19 | 2022-05-19 | Single-phase grounded relay protection device of outlet bin cable terminal |
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| CN (1) | CN217388210U (en) |
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- 2022-05-19 CN CN202221209834.XU patent/CN217388210U/en active Active
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