CN104678260A - System and method for single-phase grounding line selection of small current grounding system - Google Patents
System and method for single-phase grounding line selection of small current grounding system Download PDFInfo
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Abstract
The invention discloses a system and a method for the single-phase grounding line selection of a small current grounding system. The system comprises a device (A) with a grounding line selection function, one or more thyristor set driving devices (B), grounding resistors (C) between buses and the ground, circuit breakers or other types of switches (D), an anti-parallel thyristor set (E), voltage transformers (F) on the buses and current transformers (G) on branch circuits of feeder lines, wherein the device (A) with the grounding line selection function is used for collecting the three-phase voltage and zero-sequence voltage of the buses and the three-phase current or zero-sequence current of the feeder lines, whether a ground fault exists is judged according to the zero-sequence voltage, the conduction of the anti-parallel thyristor set (E) is triggered if the ground fault exists, and the line selection is completed according to the zero-sequence current of each feeder line. The method and the system can be applied to a non-effective grounding system of all neutral points.
Description
Technical field
The present invention relates to the relay protection field of electric system, particularly, relate to a kind of system and method for small current grounding system single-phase grounding selecting.
Background technology
In 3kV-66kV small current neutral grounding system (also known as system with non-effectively earthed neutral), single-phase earthing is comparatively common fault type.During small current neutral grounding system generation single-phase earthing, fault phase voltage-to-ground reduces, and healthy phases voltage-to-ground raises, and line voltage is still symmetrical.Because healthy phases voltage raises, easily cause the problems such as insulation vulnerable area punctures, iron core of voltage transformer is saturated, system overvoltage, therefore need to process singlephase earth fault in time, safeguards system safe and stable operation.
Small current neutral grounding system is got rid of singlephase earth fault key and is quick and precisely to select fault branch.Small current earthing wire-selecting correlation technique is since the eighties in last century, and there is the problem that False Rate is higher, main cause is always: during single-phase earthing of small current earthing system, and zero-sequence current is actual is system capacitive current, and numerical value is too small; The zero-sequence current that system electromagnetic interference (EMI), the factor such as load unbalanced cause and harmonic current, make the zero-sequence current characterizing fault not easily extract and analyze.Therefore, all there is initial data acquisition and forbidden this restriction in the route selection technology drawn after fault signature analysis merely, causes falsely dropping or leaking choosing.
Summary of the invention
Object of the present invention, be the system and method that a kind of small current grounding system single-phase grounding selecting is provided, when solving current single-phase earthing of small current earthing system, because fault branch zero-sequence current is too small, collection is inaccurate, and then the problem that the route selection False Rate caused is higher.
In order to reach above-mentioned purpose, solution of the present invention is: a kind of system of small current grounding system single-phase grounding selecting, it is characterized in that: comprise the device (A) containing earthing wire-selecting function, one or more thyristor groups drive unit (B), the thyristor groups (E) of the stake resistance (C) between bus and ground, isolating switch or other types switch (D) and reverse parallel connection, voltage transformer (VT) (F) on bus, the current transformer (G) on feeder line branch road; Three-phase current or the zero-sequence current of the three-phase voltage of bus-bar potential transformer, residual voltage and corresponding feeder line branch road is gathered by the described device (A) containing earthing wire-selecting function;
The described device (A) containing earthing wire-selecting function sends order extremely one or more thyristor groups drive unit (B) described triggering the conducting of described reverse parallel connection thyristor groups (E), is controlled the conducting of all thyristors in described reverse parallel connection thyristor groups (E) by described thyristor groups drive unit (B);
One or more thyristor groups drive unit (B) described receives the order of triggering described reverse parallel connection thyristor groups (E) conducting that the described device (A) containing earthing wire-selecting function issues, and controls the conducting of described reverse parallel connection thyristor groups (E).
In such scheme: described stake resistance (C) is divided into three-phase, described isolating switch or other types switch (D) are divided into three-phase, described reverse parallel connection thyristor groups (E) is for single-phase, the order of connection of thyristor groups (E) between bus and ground of described stake resistance (C), isolating switch or other types switch (D) and reverse parallel connection is: bus, described stake resistance (C), described isolating switch or other types switch (D), described reverse parallel connection thyristor groups (E), ground; Or: bus, described isolating switch or other types switch (D), described stake resistance (C), described reverse parallel connection thyristor groups (E), ground.
In such scheme: described containing between the device (A) of earthing wire-selecting function and one or more thyristor groups drive unit (B) described adopts hardwire mode transmission of information, or adopts wired or wireless communication modes transmission of information.
In such scheme: the described device (A) containing earthing wire-selecting function, possess and judge according to three-phase voltage and residual voltage the function whether earth fault exists, described in not limiting, comprise other functions containing in the device (A) of earthing wire-selecting function.
In such scheme: the described device (A) containing earthing wire-selecting function, possess and judge whether each bar feeder line branch road exists the function of earth fault according to each feeder line zero-sequence current of the self-produced zero-sequence current of each feeder line three-phase current or directly access, described in not limiting, comprise other functions containing in the device (A) of earthing wire-selecting function.
In such scheme: one or more thyristor groups drive unit (B) described triggers the trigger pip employing light pulse of described reverse parallel connection thyristor groups (E) or the mode of electric pulse.
In such scheme: the described device (A) containing earthing wire-selecting function directly controls described isolating switch or other types switch (D) by hardwire mode.
The present invention also provides a kind of method of small current grounding system single-phase grounding selecting, it is characterized in that: comprise step:
Real-time judge system zero sequence voltage, when there is earth fault, system produces residual voltage, and faulted phase voltage reduces, and healthy phases voltage raises; After being judged as earth fault, close isolating switch or other types switch; After isolating switch or other types switch close, send the order triggering turn on thyristors; Two groups of thyristor groups, due to reverse parallel connection, after triggering, have and only have the turn on thyristors in a direction, and the thyristor current flows of conducting is less than when maintaining electric current and automatically shuts down; Thyristor groups conduction period, form zero sequence loop in conjunction with fault ground point, the zero-sequence current of fault branch can produce the amount of uprushing, the non-faulting branch road non-zero-sequence current amount of uprushing; By differentiating the zero-sequence current amount of uprushing, complete earthing wire-selecting.
Adopt technical scheme of the present invention, there is following beneficial effect:
(1) mode adopting bus three-phase voltage to combine with residual voltage judges whether to there is earth fault fault, and reliability is high;
(2) the artificial thinking building neutral ground is adopted, form zero sequence loop with trouble spot, the zero-sequence current that fault produces can be amplified, make fault phase zero-sequence current obviously be different from healthy phases and undesired signal, convenient collection and differentiation, significantly improve route selection accuracy rate;
(3) mode adopting A.C. contactor to coordinate with reverse parallel connection thyristor groups, the time of neutral ground can be controlled within half cycle, the generation of enough fault branch zero-sequence current amounts of uprushing and collection, simultaneously, avoid and change system operation mode for a long time, improve security of system.
Accompanying drawing explanation
Fig. 1 is the wiring schematic diagram that the present invention adopts an autonomous device containing earthing wire-selecting function;
Fig. 2 is the wiring schematic diagram that the present invention adopts containing route selection function in incoming relay-protection device and feeder protection equipment.
Embodiment
Below with reference to accompanying drawing, embodiments of the invention are described in detail.
The invention provides the system of small current grounding system single-phase grounding selecting, its for object be 3kV-66kV small current neutral grounding system.Coordinate shown in Fig. 1, adopt an autonomous device (A) containing earthing wire-selecting function, be arranged in bus PT cabinet, complete collection to bus three-phase voltage and residual voltage collection, each feeder line branch road three-phase current or zero-sequence current by cable, the control to isolating switch and other type of switch (D), the order to thyristor groups drive unit (B) send; Thyristor groups drive unit (B) is installed in bus PT cabinet with the autonomous device (A) containing earthing wire-selecting function, and the order that the autonomous device (A) for receiving containing earthing wire-selecting function issues, transmission driving pulse are to reverse parallel connection thyristor groups (E); Bus three-phase voltage and residual voltage, feeder line branch road three-phase current or zero-sequence current access from bus-bar potential transformer (F), feeder current mutual inductor (G) autonomous device (A) containing earthing wire-selecting function by cable; Adopt hardwire mode between autonomous device (A) containing earthing wire-selecting function and thyristor groups drive unit (B), or adopt wired or wireless communication modes transmission of information; Thyristor groups drive unit (B) adopts the mode of cable or optical fiber to be connected with reverse parallel connection thyristor groups (E), adopts the mode transmission of information of electric pulse or light pulse; According to the bus three-phase voltage gathered and residual voltage, autonomous device (A) containing earthing wire-selecting function judges that whether earth fault exists, according to the feeder line three-phase current gathered or zero-sequence current identification fault branch, and then complete earthing wire-selecting.
Coordinate shown in Fig. 2, adopt method route selection function being embedded inlet wire protective device (A) and feeder protection equipment (H), incoming relay-protection device (A) and feeder protection equipment (H) are installed in corresponding breaker cabinet, incoming relay-protection device (A) completes bus three-phase voltage and residual voltage collection by cable, to the control of isolating switch and other type of switch (D), the order of thyristor groups drive unit (B) is sent, each feeder protection equipment (H) completes the collection to respective feed connection branch road three-phase current or zero-sequence current by cable, thyristor groups drive unit (B) can be installed in bus PT cabinet, for receiving order that incoming relay-protection device (A) issues, sending driving pulse to reverse parallel connection thyristor groups (E), bus three-phase voltage and residual voltage access incoming relay-protection device (A) by cable from bus-bar potential transformer (F), and feeder line branch road three-phase current or zero-sequence current access feeder protection equipment (H) by cable from feeder current mutual inductor (G), adopt hardwire mode between incoming relay-protection device (A) and thyristor groups drive unit (B), or adopt wired or wireless communication modes transmission of information, thyristor groups drive unit (B) adopts the mode of cable or optical fiber to be connected with reverse parallel connection thyristor groups (E), adopts the mode transmission of information of electric pulse or light pulse, according to the bus three-phase voltage gathered and residual voltage, incoming relay-protection device (A) judges that whether earth fault exists, feeder protection equipment (H) according to the feeder line three-phase current gathered or zero-sequence current identification fault branch, and then completes earthing wire-selecting.
Certain 10kV isolated neutral system, 10kV bus I length of tape 7 feeder line branch roads, during wall scroll feeder line branch road generation singlephase earth fault, fault branch zero-sequence current one sub-value (capacitance current) about 7A, non-faulting branch road zero-sequence current one sub-value (capacitance current) about 1.5A, after gathering, conversion is too small to two sub-values, is unfavorable for accurate route selection.Adopt scheme shown in Fig. 1, three-phase ground resistance chooses 3*200 ohm, when there is single-phase earthing, line-selected earthing device detects that residual voltage exceedes pre-set value, judges that earth fault exists, close isolating switch and trigger the conducting of reverse parallel connection thyristor groups in conjunction with three-phase voltage feature, about 110A is up at half cycle internal fault branch road zero-sequence current instantaneous value, all the other branch road zero-sequence currents are substantially unchanged, and line-selected earthing device collects this electric current amount of uprushing, and exports route selection result accurately.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (8)
1. the system of a small current grounding system single-phase grounding selecting, it is characterized in that: comprise the device (A) containing earthing wire-selecting function, one or more thyristor groups drive unit (B), the thyristor groups (E) of the stake resistance (C) between bus and ground, isolating switch or other types switch (D) and reverse parallel connection, voltage transformer (VT) (F) on bus, the current transformer (G) on feeder line branch road;
Three-phase current or the zero-sequence current of the three-phase voltage of bus-bar potential transformer, residual voltage and corresponding feeder line branch road is gathered by the described device (A) containing earthing wire-selecting function;
The described device (A) containing earthing wire-selecting function sends order extremely one or more thyristor groups drive unit (B) described triggering the conducting of described reverse parallel connection thyristor groups (E), is controlled the conducting of all thyristors in described reverse parallel connection thyristor groups (E) by described thyristor groups drive unit (B);
One or more thyristor groups drive unit (B) described receives the order of triggering described reverse parallel connection thyristor groups (E) conducting that the described device (A) containing earthing wire-selecting function issues, and controls the conducting of described reverse parallel connection thyristor groups (E).
2. the system of small current grounding system single-phase grounding selecting as claimed in claim 1, it is characterized in that: described stake resistance (C) is divided into three-phase, described isolating switch or other types switch (D) are divided into three-phase, described reverse parallel connection thyristor groups (E) is for single-phase, described stake resistance (C), the order of connection of thyristor groups (E) between bus and ground of isolating switch or other types switch (D) and reverse parallel connection is: bus, described stake resistance (C), described isolating switch or other types switch (D), described reverse parallel connection thyristor groups (E), ground, or: bus, described isolating switch or other types switch (D), described stake resistance (C), described reverse parallel connection thyristor groups (E), ground.
3. the system of small current grounding system single-phase grounding selecting as claimed in claim 1, it is characterized in that: described containing between the device (A) of earthing wire-selecting function and one or more thyristor groups drive unit (B) described adopts hardwire mode transmission of information, or adopts wired or wireless communication modes transmission of information.
4. the system of small current grounding system single-phase grounding selecting as claimed in claim 1, it is characterized in that: the described device (A) containing earthing wire-selecting function, possess and judge according to three-phase voltage and residual voltage the function whether earth fault exists, described in not limiting, comprise other functions containing in the device (A) of earthing wire-selecting function.
5. the system of small current grounding system single-phase grounding selecting as claimed in claim 1, it is characterized in that: the described device (A) containing earthing wire-selecting function, possess and judge whether each bar feeder line branch road exists the function of earth fault according to each feeder line zero-sequence current of the self-produced zero-sequence current of each feeder line three-phase current or directly access, described in not limiting, comprise other functions containing in the device (A) of earthing wire-selecting function.
6. the system of small current grounding system single-phase grounding selecting as claimed in claim 1, is characterized in that: one or more thyristor groups drive unit (B) described triggers the trigger pip employing light pulse of described reverse parallel connection thyristor groups (E) or the mode of electric pulse.
7. the system of small current grounding system single-phase grounding selecting as claimed in claim 1 or 2, is characterized in that: the described device (A) containing earthing wire-selecting function directly controls described isolating switch or other types switch (D) by hardwire mode.
8. a method for small current grounding system single-phase grounding selecting, is characterized in that: comprise step:
Real-time judge system zero sequence voltage, when there is earth fault, system produces residual voltage, and faulted phase voltage reduces, and healthy phases voltage raises; After being judged as earth fault, close isolating switch or other types switch; After isolating switch or other types switch close, send the order triggering turn on thyristors; Two groups of thyristor groups, due to reverse parallel connection, after triggering, have and only have the turn on thyristors in a direction, and the thyristor current flows of conducting is less than when maintaining electric current and automatically shuts down; Thyristor groups conduction period, form zero sequence loop in conjunction with fault ground point, the zero-sequence current of fault branch can produce the amount of uprushing, the non-faulting branch road non-zero-sequence current amount of uprushing; By differentiating the zero-sequence current amount of uprushing, complete earthing wire-selecting.
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| CN201510133797.7A CN104678260A (en) | 2015-03-25 | 2015-03-25 | System and method for single-phase grounding line selection of small current grounding system |
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| CN105548807A (en) * | 2015-12-15 | 2016-05-04 | 江苏省电力公司无锡供电公司 | Single-phase fault line selection method of low current grounding system |
| CN106483427A (en) * | 2016-09-30 | 2017-03-08 | 广东电网有限责任公司潮州供电局 | Small current earthing wire-selecting method |
| CN106532676A (en) * | 2017-01-06 | 2017-03-22 | 杨文强 | Magnetic induction ground blanking device |
| CN106711987A (en) * | 2017-03-21 | 2017-05-24 | 南京福致通电气自动化有限公司 | Quick arc extinguishing system and method for single-phase ground fault of low-current ground system |
| CN106872857A (en) * | 2017-03-13 | 2017-06-20 | 安徽天电气技术股份有限公司 | A kind of residual voltage drives the ground fault line selection device of zero-sequence current |
| CN107402340A (en) * | 2017-07-28 | 2017-11-28 | 南京南瑞继保电气有限公司 | A kind of single-phase grounded malfunction in grounded system of low current method of discrimination based on energy model |
| CN107942203A (en) * | 2018-01-09 | 2018-04-20 | 济南大学 | A kind of small current earthing wire-selecting method for strengthening fault signature |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN110687389A (en) * | 2018-07-05 | 2020-01-14 | 李景禄 | Method for measuring key parameters of transfer grounding device and judging arc extinction of fault point |
| CN110988669A (en) * | 2019-12-24 | 2020-04-10 | 山东钢铁股份有限公司 | Fault detection method and device for high-voltage circuit breaker |
| CN112240965A (en) * | 2019-07-17 | 2021-01-19 | 南京南瑞继保工程技术有限公司 | Grounding line selection device and method based on deep learning algorithm |
| CN112436491A (en) * | 2019-08-26 | 2021-03-02 | 中国石油化工股份有限公司 | Small current grounding protection device and protection method |
| CN112986862A (en) * | 2021-04-27 | 2021-06-18 | 重庆大学 | Single-phase earth fault identification method of small current grounding system |
| CN113552441A (en) * | 2020-04-24 | 2021-10-26 | 南京南瑞继保电气有限公司 | Single-phase earth fault detection method and device |
| CN113725811A (en) * | 2020-12-12 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding of non-effective grounding system |
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| CN105548807B (en) * | 2015-12-15 | 2018-09-21 | 江苏省电力公司无锡供电公司 | Small current neutral grounding system earth fault detection for power |
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| CN106532676A (en) * | 2017-01-06 | 2017-03-22 | 杨文强 | Magnetic induction ground blanking device |
| CN106872857A (en) * | 2017-03-13 | 2017-06-20 | 安徽天电气技术股份有限公司 | A kind of residual voltage drives the ground fault line selection device of zero-sequence current |
| CN106711987A (en) * | 2017-03-21 | 2017-05-24 | 南京福致通电气自动化有限公司 | Quick arc extinguishing system and method for single-phase ground fault of low-current ground system |
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| CN107942203A (en) * | 2018-01-09 | 2018-04-20 | 济南大学 | A kind of small current earthing wire-selecting method for strengthening fault signature |
| CN110687389A (en) * | 2018-07-05 | 2020-01-14 | 李景禄 | Method for measuring key parameters of transfer grounding device and judging arc extinction of fault point |
| CN112240965A (en) * | 2019-07-17 | 2021-01-19 | 南京南瑞继保工程技术有限公司 | Grounding line selection device and method based on deep learning algorithm |
| CN112436491A (en) * | 2019-08-26 | 2021-03-02 | 中国石油化工股份有限公司 | Small current grounding protection device and protection method |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN110988669A (en) * | 2019-12-24 | 2020-04-10 | 山东钢铁股份有限公司 | Fault detection method and device for high-voltage circuit breaker |
| CN113552441A (en) * | 2020-04-24 | 2021-10-26 | 南京南瑞继保电气有限公司 | Single-phase earth fault detection method and device |
| CN113552441B (en) * | 2020-04-24 | 2024-04-30 | 南京南瑞继保电气有限公司 | Single-phase earth fault detection method and device |
| CN113725811A (en) * | 2020-12-12 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding of non-effective grounding system |
| CN113725811B (en) * | 2020-12-12 | 2023-12-05 | 保定钰鑫电气科技有限公司 | Single-phase grounding processing method of non-effective grounding system |
| CN112986862A (en) * | 2021-04-27 | 2021-06-18 | 重庆大学 | Single-phase earth fault identification method of small current grounding system |
| CN112986862B (en) * | 2021-04-27 | 2024-04-09 | 重庆大学 | Power distribution network fault indicator sensitivity improving method based on neutral point resistance control |
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