CN1309136C - Single phase grounding compensation detecting device - Google Patents
Single phase grounding compensation detecting device Download PDFInfo
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- CN1309136C CN1309136C CNB031129005A CN03112900A CN1309136C CN 1309136 C CN1309136 C CN 1309136C CN B031129005 A CNB031129005 A CN B031129005A CN 03112900 A CN03112900 A CN 03112900A CN 1309136 C CN1309136 C CN 1309136C
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- 230000001629 suppression Effects 0.000 claims abstract description 26
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 230000004907 flux Effects 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract 1
- 230000001012 protector Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
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Abstract
The present invention relates to a protector used for the grounding fault current limitation or suppression and the grounding fault current compensation detection, particularly to a single-phase grounding compensation detecting device. The present invention comprises a grounding transformer, an arc extinguishing coil loop and a resistor loop, wherein the grounding transformer is a three-phase transformer; a three-phase line arranged at one end of the three-phase transformer is in electric connection with a three-phase line of a power network system; the resistor loop comprises a resistor; the arc extinguishing coil loop comprises an arc extinguishing coil. The present invention has the structural characteristics that the arc extinguishing coil loop and the resistor loop are connected in parallel into a parallel connection circuit; one end of the parallel connection circuit is connected with a neutral point of the grounding transformer, and the other end is in a grounding state; the present invention also comprises a high voltage and low voltage switch device which is electrically connected with the resistor. The present invention has the advantages that the technical defects of technical persons in the field is overcome, and the present invention obtains good technical effects, so the personal safety on the application is ensured, the effect of minimum fault residual current is achieved, simultaneously, the cost is saved, and the compensation performance and the detection performance are improved.
Description
Technical field
The present invention relates to a kind of restriction or suppress earth fault current and the protective device of compensation detection, particularly a kind of single-phase earthing compensation checkout gear.
Background technology
Single-phase earthing compensation checkout gear of the prior art, comprise grounding transformer, arc suppression coil and resistance loop, grounding transformer is a three-phase transformer, corresponding with the triple line of the electrical network respectively connection of the three-phase of one end, arc suppression coil and resistance loop are connected on the neutral point side of three-phase transformer respectively, and resistance loop comprises resistance and high-voltage switch gear.In the grounding system of electrical network; when single phase ground fault takes place when; the earth point of this phase will flow through the capacitive earth current; when this capacity current over the ground is excessive; light electric arc easily; cause arc overvoltage; thereby cause the expansion of fault; can offset the capacity current of fault this moment by the inductance current of arc suppression coil; make the fault residual flow be reduced to minimum value; by high-voltage switch gear resistance loop is carried out instantaneous input and disconnection simultaneously,, and guarantee that the relaying protection in the electrical network has enough big immediate current to make it action with instantaneous current in resistance property in the increase loop.Its weak point is: 1, the switching to resistance loop is the operation of adopting high-voltage switch gear, exists the potential safety hazard in the use; 2, the price height of high-voltage switch gear causes cost also very high, and the performance of use and economic worth are than low.
Invention constitutes
But the objective of the invention is to overcome weak point of the prior art and provide a kind of safety operation, cost low single-phase earthing compensation checkout gear.
The present invention can realize by following approach:
Single-phase earthing compensation checkout gear, comprise grounding transformer, arc suppression coil loop and resistance loop, grounding transformer is a three-phase transformer, the triple line of one end is electrically connected with the triple line of network system, resistance loop includes resistance, the arc suppression coil loop includes arc suppression coil, its structural feature is, also include a low voltage switching device and first control switch, this low voltage switching device comprises low-voltage control switch and transformer, after being connected in series, low-voltage control switch and resistance is attempted by the secondary side of transformer, the secondary side winding of transformer has a plurality of terminals, first control switch has a plurality of control ends, a plurality of terminals of these a plurality of control ends and transformer connect one to one, and the arc suppression coil loop is connected with first control switch, and are attempted by the secondary side of transformer by first control switch, first siding ring one end of transformer is connected in the neutral point of grounding transformer, other end ground connection.
Because adopting high-voltage switch gear directly regulates structurally simple, therefore, those skilled in the art consider from technical standpoint, in single-phase earthing compensation checkout gear, all use high-voltage switch gear to regulate, and do not consider to use low voltage switching device, but in the course of time, those skilled in the art all think no matter be at technical elements, still in other respects, low voltage switching device all is not suitable in this compensation checkout gear, like this, produced this ubiquitous understanding that departs from objective fact, this technology prejudice is guiding people not consider low voltage switching device possibility of its application this single-phase earthing compensation checkout gear from other angles for a long time.And the present inventor acts in a diametrically opposite way just, the technological means that has adopted people to give up by this technology prejudice, thereby solved technical problem, that is: because low voltage switching device can be controlled high tension loop by low tension loop, only need artificial control end is arranged on low tension loop, just can control high-tension circuit, promptly come the access and the disconnection of controlling resistance by low voltage switching device.Like this, because low tension loop is safer in the use with respect to high-voltage switch gear, this device just can be easily by the people for controlling, the cost of low voltage switching device is comparatively cheap simultaneously, and for instance: in the 10KV network system, the price of the high-voltage switch gear of a 10KV is 4～50,000 yuan, and a cover low voltage switching device, it is the highest to be no more than 4～5,000 yuan, and it has differed nearly 10 times one-tenth capital sum, thereby solves because of the high low problem of cost performance that causes of cost.
Transformer is as low voltage switching device; the secondary side of its low pressure connects resistance loop; so just can pass through the cut-out and the access of the low-voltage control switch controlling resistance of low-pressure end secondary side; to increase instantaneous current in resistance property in the primary side loop; and the relaying protection in the assurance electrical network has enough big immediate current to make it action, thereby plays the effect of detection line fault.
In addition, because in the system, the size of fault current is indefinite, need inject inductance current according to the fault current size, prevent undercompensation or overcompensation, therefore be attempted by first control switch of secondary side and being electrically connected of arc suppression coil by adjusting, both can regulate the size of inductive current automatically, guarantee safety operation again, simultaneously, if will realize adjusting in the high-pressure side to arc suppression coil, its engineering complexity, the cost height, and arc suppression coil is connected low-pressure side, and inductance value is regulated, the size that changes its inductive current is gone into the ground capacity current with corresponding compensate for failed, thereby has obtained unforeseeable technique effect.
The present invention can also further be specially:
Low voltage switching device can also have various ways:
Low voltage switching device can be a kind of low-voltage control switch;
Low-voltage control switch can be a kind of SCR control switch, can also be a kind of relay circuit breaker.
The SCR control switch is a kind of high-tension electricity reverse-blocking tetrode thyristor, and the relay circuit breaker then can be realized low voltage electromagnetic relay control high tension loop, and the two all can realize the effect of low tension switch control high tension loop.
The present invention can also further be specially:
Arc suppression coil is a kind of variable reactor, and it comprises main coil, secondary coil, control device and flux change device, and an end of control device is electrically connected with secondary coil by the flux change device, and the other end then is connected with main coil;
Control device includes sample circuit, reference circuit, comparison gate and second control switch, one end of sample circuit is connected with main coil, the other end then is connected with an input that compares gate, reference circuit is connected with another input that compares gate, relatively the gate output is connected with the control end of second control switch, total a plurality of second control switchs arranged side by side also respectively with the corresponding connection of a plurality of terminals in the flux change device.
Variable reactor can change its reactance value according to the needs of electric power system: the signal of telecommunication that the sample circuit sampling changes because of system change, excursion zoning territory with this value of electrical signals, each corresponding one group of fiducial value in zone, and every group of corresponding one second control switch of fiducial value, because the corresponding joint that connects the flux change device of each second control switch, the control of cut-offfing by to second control switch can realize the adjustment to the main coil reactance value.Like this, arc suppression coil just can provide corresponding inductance current to satisfy the needs of system by the conversion reactance value.The specific descriptions of variable reactor are seen Chinese patent ZL98227941.8.
The present invention can also realize by following approach:
Also include controller, it is connected with the control end of low-voltage control switch, controller comprises sampler, comparison means, standard apparatus, time set and final controlling element, the output of sampler and standard apparatus is connected with two inputs of comparison means respectively, the output of comparison means connects the input of time set and the control end of final controlling element respectively, the output of time set is connected with another input of final controlling element simultaneously, and the output control terminal of final controlling element is connected with the control end of low-voltage control switch.
Controller is used for controlling low-voltage control switch: the signal of telecommunication of sampler sampling circuit, and compare by the fiducial value in comparison means and the standard apparatus, when the signal of telecommunication during greater than fiducial value, then when reaching the time that time set sets, send a signal to final controlling element, by cut-offfing of final controlling element control low-voltage control switch.
In sum, the invention has the advantages that: adopted low voltage switching device, both overcome those skilled in the art's technology prejudice: think that promptly only suitable high-voltage switch gear is regulated in the single-phase earthing compensation checkout gear; Obtain unforeseeable technique effect again, both arc suppression coil has been placed on the low pressure secondary side, enabled inductance value is regulated, thereby promptly guaranteed the personal safety in the use, can reach the effect that makes fault residual flow minimum again; Saved cost simultaneously, the performance that has improved compensation and detected.
Description of drawings
Figure 1 shows that the electrical block diagram of the embodiment of the invention 1;
Figure 2 shows that the circuit frame schematic diagram of controller of the present invention;
Figure 3 shows that the circuit diagram of controller of the present invention;
Figure 4 shows that the circuit frame schematic diagram of variable reactor control device in the embodiment of the invention 1.
Figure 5 shows that the electrical block diagram of most preferred embodiment of the present invention.
Below we the invention will be further described in conjunction with the accompanying drawings.
Specific embodiment
Embodiment 1:
With reference to accompanying drawing 1, single-phase earthing compensation checkout gear includes grounding transformer 1, arc suppression coil loop 2, resistance loop, low voltage switching device 4 and controller 5, and arc suppression coil loop 2 comprises arc suppression coil 21, and resistance loop comprises resistance 31; Low voltage switching device 4 is an electric power reverse-blocking tetrode thyristor, and it is installed in the resistance loop, and is connected in series with resistance 31; Arc suppression coil 21 is a variable reactor, and it includes main coil 22, secondary coil 23, control device 24 and flux change device 25, and an end of control device 24 is electrically connected with secondary coil 23 by flux change device 25, and the other end then is connected with main coil 22; Controller 5 one control ends are electrically connected with the electric power reverse-blocking tetrode thyristor, and the other end is connected with the power network monitoring device.
With reference to accompanying drawing 2, controller 5 comprises sampler 51, comparison means 52, standard apparatus 53, time set 54 and final controlling element 55, the output of sampler 51 and standard apparatus 53 is connected with two inputs of comparison means 52 respectively, the output of comparison means 52 connects the input of time set 54 and the control end of final controlling element 55 respectively, the output of time set 54 is connected with another input of final controlling element 55 simultaneously, and the output control terminal of final controlling element 55 is connected with the control end of electric power reverse-blocking tetrode thyristor 4.Its operating circuit is as follows:
With reference to accompanying drawing 3, sampler 51, comparison means 52 and standard apparatus 53 comprise relay YJ, and final controlling element 55 comprises the loop that relay YJ normal opened contact, relay ZJ normally closed contact, closing coil HC and low tension switch DL are connected in regular turn, with the loop that relay ZJ normal opened contact, relay DL normal opened contact and breaking coil TQ are connected in regular turn, time set 54 comprises the loop that loop that relay YJ normal opened contact is connected with time relay sj and time relay sj time-delay contact are connected with relay ZJ.
When the numerical value by the sampling gained during greater than the value of standard apparatus 53, then relay YJ action, the relay YJ normal opened contact closure of final controlling element and time set, closing coil HC adhesive this moment, the conducting of electric power reverse-blocking tetrode thyristor, and time relay sj carried out timing 1 second, time actuating relay SJ closure after 1 second, relay ZJ action, relay ZJ normal opened contact in the final controlling element and relay ZJ normally closed contact are closed respectively and open, breaking coil TQ energising, control electric power reverse-blocking tetrode thyristor turn-offs.
Arc suppression coil is a variable reactor, and its control device execution mode is as follows:
With reference to accompanying drawing 4, control device includes sample circuit 241, reference circuit 242, compares the gate 243 and second control switch 244, one end of sample circuit 241 is connected with main coil, the other end then is connected with an input that compares gate 243, reference circuit 242 is connected with another input that compares gate 243, relatively gate 243 outputs are connected with the control end of second control switch 244, have 5 second control switchs 244 arranged side by side also respectively with flux change device 25 in 5 terminals connect one to one.(the variable reactance implement body can be referring to Chinese patent ZL98227941.8.)
It is same as the prior art that present embodiment is not stated part.
Most preferred embodiment:
With reference to accompanying drawing 5, low voltage switching device 4 comprises low-voltage control switch 41 and transformer 42, after being connected in series with resistance 31, low-voltage control switch 41 is attempted by the secondary side of transformer 42, the secondary side winding of transformer 42 has a plurality of terminals, first control switch 45 has a plurality of control ends, a plurality of terminals of these a plurality of control ends and transformer 42 connect one to one, arc suppression coil loop 2 is connected with first control switch 45, and be attempted by the secondary side of transformer 42 by first control switch 45, first siding ring one end of transformer 42 is connected in the neutral point of grounding transformer 1, other end ground connection.Arc suppression coil 21 is an inductance.
It is identical with embodiment 1 that present embodiment is not stated part.
Claims (4)
1, single-phase earthing compensation checkout gear, comprise grounding transformer (1), arc suppression coil loop (2) and resistance loop (3), grounding transformer (1) is a three-phase transformer, the triple line of one end is electrically connected with the triple line of network system, resistance loop (3) includes resistance (31), arc suppression coil loop (2) includes arc suppression coil (21), it is characterized in that, also include a low voltage switching device (4) and first control switch (45), this low voltage switching device (4) comprises low-voltage control switch (41) and transformer (42), after being connected in series with resistance (31), low-voltage control switch (41) is attempted by the secondary side of transformer (42), the secondary side winding of transformer (42) has a plurality of terminals, first control switch (45) has a plurality of control ends, a plurality of terminals of these a plurality of control ends and transformer (42) connect one to one, arc suppression coil loop (2) is connected with first control switch (45), and be attempted by the secondary side of transformer (42) by first control switch (45), first siding ring one end of transformer (42) is connected in the neutral point of grounding transformer (1), other end ground connection.
2, single-phase earthing compensation checkout gear according to claim 1, it is characterized in that, arc suppression coil (21) is a kind of variable reactor, it comprises main coil (22), secondary coil (23), control device (24) and flux change device (25), one end of control device (24) is electrically connected with secondary coil (23) by flux change device (25), and the other end then is connected with main coil (22).
3, single-phase earthing compensation checkout gear according to claim 2, it is characterized in that, control device (24) includes sample circuit (241), reference circuit (242), compare gate (243) and second control switch (244), one end of sample circuit (241) is connected with main coil (22), the other end then is connected with an input that compares gate (243), reference circuit (242) is connected with another input that compares gate (243), relatively gate (243) output is connected with the control end of second control switch (244), total a plurality of second control switchs (244) arranged side by side also respectively with flux change device (25) in a plurality of terminals connect one to one.
4, single-phase earthing compensation checkout gear according to claim 1, it is characterized in that, also include controller (5), it is electrically connected with low-voltage control switch (41), controller (5) comprises sampler (51), comparison means (52), standard apparatus (53), time set (54) and final controlling element (55), the output of sampler (51) and standard apparatus (53) is connected with two inputs of comparison means (52) respectively, the output of comparison means (52) connects the input of time set (54) and the control end of final controlling element (55) respectively, the output of time set (54) is connected with another input of final controlling element (55) simultaneously, and the output control terminal of final controlling element (55) is connected with the control end of low-voltage control switch (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031129005A CN1309136C (en) | 2003-02-26 | 2003-02-26 | Single phase grounding compensation detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031129005A CN1309136C (en) | 2003-02-26 | 2003-02-26 | Single phase grounding compensation detecting device |
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| Publication Number | Publication Date |
|---|---|
| CN1514522A CN1514522A (en) | 2004-07-21 |
| CN1309136C true CN1309136C (en) | 2007-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031129005A Expired - Fee Related CN1309136C (en) | 2003-02-26 | 2003-02-26 | Single phase grounding compensation detecting device |
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| CN (1) | CN1309136C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100521434C (en) * | 2006-05-19 | 2009-07-29 | 南方电网技术研究中心 | Device for restraining AC transformer DC magnetic bias current |
| CN103050948A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Instant single-phase earth fault processing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2521811Y (en) * | 2002-01-24 | 2002-11-20 | 上海思源电气股份有限公司 | Shunt resistance type autoamtic tracking arc suppression compensating & select switch |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2521811Y (en) * | 2002-01-24 | 2002-11-20 | 上海思源电气股份有限公司 | Shunt resistance type autoamtic tracking arc suppression compensating & select switch |
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| CN1514522A (en) | 2004-07-21 |
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Owner name: LUO MINGLAN; FUJIAN ELECTRIC POWER SURVEY AND DES Free format text: FORMER OWNER: LUO MINGLAN; LEI LONGWU; WANG JINJUN; LUO XIANGMEI Effective date: 20080411 |
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Effective date of registration: 20121226 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: Fujian Electric Power Co., Ltd. Patentee after: Fujian Electric Power Survey and Design Institute Patentee after: Fujian Yong Fu Project Consultant Co., Ltd. Patentee after: Luo Minglan Address before: 350001, No. 8, 20 East Main Road, Gulou District, Fujian, Fuzhou 132 Patentee before: Luo Minglan Patentee before: Fujian Electric Power Survey and Design Institute Patentee before: Fujian Yong Fu Project Consultant Co., Ltd. |
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Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: Fujian Electric Power Co., Ltd. Patentee after: Fujian Electric Power Survey and Design Institute Patentee after: FUJIAN YONGFU POWER ENGINEERING CO., LTD. Patentee after: Luo Minglan Address before: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee before: State Grid Corporation of China Patentee before: Fujian Electric Power Co., Ltd. Patentee before: Fujian Electric Power Survey and Design Institute Patentee before: Fujian Yong Fu Project Consultant Co., Ltd. Patentee before: Luo Minglan |
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Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Co-patentee after: Fujian Electric Power Co., Ltd. Patentee after: State Grid Corporation of China Co-patentee after: China Electric Power Construction Group Fujian electric survey and Design Institute Co., Ltd. Co-patentee after: FUJIAN YONGFU POWER ENGINEERING CO., LTD. Co-patentee after: Luo Minglan Address before: 100031 West Chang'an Avenue, Beijing, No. 86 Co-patentee before: Fujian Electric Power Co., Ltd. Patentee before: State Grid Corporation of China Co-patentee before: Fujian Electric Power Survey and Design Institute Co-patentee before: FUJIAN YONGFU POWER ENGINEERING CO., LTD. Co-patentee before: Luo Minglan |
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