CN2605579Y - Single-phase grounding compensation detectnig apparatus - Google Patents
Single-phase grounding compensation detectnig apparatus Download PDFInfo
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- CN2605579Y CN2605579Y CN 03220138 CN03220138U CN2605579Y CN 2605579 Y CN2605579 Y CN 2605579Y CN 03220138 CN03220138 CN 03220138 CN 03220138 U CN03220138 U CN 03220138U CN 2605579 Y CN2605579 Y CN 2605579Y
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Abstract
The utility model relates to a protection device for the restriction and inhibition on the grounding fault current and the compensation detection, in particular to a single-phase grounding compensation detection device, which comprises a grounding transformer, an arc suppression coil return circuit, a resistance return circuit; the grounding transformer is a three-phase transformer, the three-phase wire of one end of the grounding transformer is electrically connected with a three-phase wire of the power grid; the resistance return circuit comprises a resistance; the arc suppression coil return circuit comprises an arc suppression coil. The utility model is characterized in that: a joint circuit is formed by connecting the arc suppression coil return circuit with the resistance return circuit in parallel, one end of the joint circuit is connected with a neutral point of the grounding transformer, while the other end is connected with the ground; the utility model also comprises a dual pressure switch device, which is connected with the resistance electrically. The utility model has the advantages of that: the technical bias of the technicians in the field can be solved; and unexpected technical results can be obtained, thereby the personal safety when in use is ensured, and the effects of minimum fault residual flow are realized; simultaneously the cost is saved, and the compensation and detection performance is improved.
Description
Technical field
The utility model relates to a kind of restriction or suppresses earth-fault current and the protective device of compensation detection, particularly a kind of single-phase earthing compensation pick-up unit.
Background technology
Single-phase earthing compensation pick-up unit of the prior art, comprise grounding transformer, arc suppression coil and resistance loop, grounding transformer is corresponding with the triple-phase line of the electrical network respectively connection of the three-phase of three-phase transformer 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 earthed system of electrical network; when singlephase earth fault takes place when; the earth point of this phase will flow through the capacitive ground 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 relay 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 being to overcome weak point of the prior art, the purpose of this utility model provide a kind of safe operation, cost low single-phase earthing compensation pick-up unit.
The utility model can be realized by following approach:
Single-phase earthing compensation pick-up unit, comprise grounding transformer, arc suppression coil loop and resistance loop, grounding transformer is a three-phase transformer, the triple-phase line of one end is electrically connected with the triple-phase line of network system, resistance loop includes resistance, the arc suppression coil loop includes arc suppression coil, its structural feature is, arc suppression coil loop and resistance loop also are unified into connection circuit in the lump, the one end is connected in the neutral point of grounding transformer, other end ground connection also includes a high and low voltage switch device, and it is electrically connected with resistance.
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 pick-up unit, all use high-voltage switch gear to regulate; and do not consider to use the high and low voltage switch device; but in the course of time; those skilled in the art all think no matter be at technical elements; still in other respects; the high and low voltage switch device all is not suitable in this compensation pick-up unit; like this, produced this ubiquitous understanding that departs from objective fact, this technology prejudice is guiding people not consider high and low voltage switch device possibility of its application this lost territory protective device from other angles for a long time.And inventor of the present utility model acts in a diametrically opposite way just, the technological means that has adopted people to give up by this technology prejudice, thereby solved technical matters, that is: because the high and low voltage switch 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 the high and low voltage switch 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 high and low voltage switch 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 high and low voltage switch device such as a transformer, 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.
The utility model can also further be specially:
The high and low voltage switch device can have various ways:
The high and low voltage switch device can be a kind of dual pressure control switch;
Dual pressure control switch can be a kind of SCR control switch, can also be a kind of relay isolating switch.
The SCR control switch is a kind of high-tension electricity transwitch, and the relay isolating switch 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 utility model can also be realized by following approach:
The high and low voltage switch device comprises low-voltage control switch and transformer, and resistance is connected with low-voltage control switch, and is connected the secondary side of transformer;
Transformer also is a kind of high and low voltage switch device; the secondary side of its low pressure connects resistance; so just can pass through the cut-out and the access of the secondary side controlling resistance of low pressure end; to increase instantaneous current in resistance property in the primary side loop; and the relay protection in the assurance electrical network has enough big immediate current to make it action, thereby plays the effect of detection line fault.
The secondary side winding of transformer has a plurality of terminals, has a plurality of gauge tap and a plurality of terminals to connect one to one.
The arc suppression coil loop is attempted by the secondary side of transformer, and is electrically connected with gauge tap.
Because in the system, the size of fault current is indefinite, need inject inductance current according to the fault current size, prevent undercompensation or over-compensation, therefore be attempted by the gauge tap of secondary side and being electrically connected of arc suppression coil by adjusting, both can regulate the size of inductive current automatically, guaranteed safe operation again, simultaneously, if will realize adjusting in the high-pressure side, its engineering complexity to arc suppression coil, the cost height, and arc suppression coil is connected low-pressure side, and inductance value regulated, the size that changes its inductive current is with corresponding fault current, thereby obtained unforeseeable technique effect.
The utility model 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 gauge tap, one end of sample circuit is connected with main coil, the other end then is connected with an input end that compares gate, reference circuit is connected with another input end that compares gate, relatively the gate output terminal is connected with the control end of gauge tap, total a plurality of gauge tap 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 system: the electric signal that the sample circuit sampling changes because of system change, variation range zoning territory with this value of electrical signals, each corresponding one group of reference value in zone, and every group of corresponding gauge tap of reference value, because the corresponding joint that connects the flux change device of each gauge tap, the control of cut-offfing by to gauge tap 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 utility model can also be realized by following approach:
Also include controller, it is connected with the control end of dual pressure control switch, controller comprises sampler, comparison means, standard apparatus, time set and actuating unit, the output terminal of sampler and standard apparatus is connected with two input ends of comparison means respectively, the output terminal of comparison means connects the input end of time set and the control end of actuating unit respectively, the output terminal of time set is connected with another input end of actuating unit simultaneously, and the output control terminal of actuating unit is connected with the control end of dual pressure control switch.
Controller is used for controlling dual pressure control switch: the electric signal of sampler sampling circuit, and compare by the reference value in comparison means and the standard apparatus, when electric signal during greater than reference value, then when reaching the time that time set sets, send a signal to actuating unit, by cut-offfing of actuating unit control dual pressure control switch.
In sum, advantage of the present utility model is: adopted the high and low voltage switch device, both overcome those skilled in the art's technology prejudice: both thought that only suitable high-voltage switch gear was regulated in the single-phase earthing compensation pick-up unit; 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 utility model embodiment 1;
Figure 2 shows that the circuit frame synoptic diagram of the utility model controller;
Figure 3 shows that the circuit diagram of the utility model controller;
Figure 4 shows that the circuit frame synoptic diagram of variable reactor control device among the utility model embodiment 1.
Figure 5 shows that the electrical block diagram of the utility model most preferred embodiment.
Below we the utility model will be further described in conjunction with the accompanying drawings.
Specific embodiment
Embodiment 1:
With reference to accompanying drawing 1, single-phase earthing compensation pick-up unit includes grounding transformer 1, arc suppression coil loop 2, resistance loop 3, high and low voltage switch device 4 and controller 5, and arc suppression coil loop 2 comprises arc suppression coil 21, and resistance loop 3 comprises resistance 31; High and low voltage switch device 4 is an electric power transwitch, and it is installed in the resistance loop 3, and is electrically connected 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 ends are electrically connected with the electric power transwitch, 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 actuating unit 55, the output terminal of sampler 51 and standard apparatus 53 is connected with two input ends of comparison means 52 respectively, the output terminal of comparison means 52 connects the input end of time set 54 and the control end of actuating unit 55 respectively, the output terminal of time set 54 is connected with another input end of actuating unit 55 simultaneously, and the output control terminal of actuating unit 55 is connected with the control end of electric power transwitch 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 actuating unit 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 actuating unit and time set, closing coil HC action this moment, the conducting of control electric power transwitch, 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 actuating unit and relay ZJ normally closed contact are closed respectively and open, relay HC moves once more, and control electric power transwitch turn-offs.
Arc suppression coil is a variable reactor, and its control device embodiment is as follows:
With reference to accompanying drawing 4, control device includes sample circuit 241, reference circuit 242, compares gate 243 and gauge tap 244, one end of sample circuit 241 is connected with main coil, the other end then is connected with an input end that compares gate 243, reference circuit 242 is connected with another input end that compares gate 243, relatively gate 243 output terminals are connected with the control end of gauge tap 244, have 5 gauge tap 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, high and low voltage switch device 4 comprises low tension switch 41 and transformer 42, resistance 31 is connected with low-voltage control switch 41, and be connected the secondary side of transformer 42, the secondary side winding of transformer 42 has 5 terminals, has 5 gauge tap 45 and these terminals to connect one to one, and arc suppression coil 21 is an inductance, it is attempted by the secondary side of transformer 42, and is electrically connected with gauge tap 45.
It is identical with embodiment 1 that present embodiment is not stated part.
Claims (10)
1, single-phase earthing compensation pick-up unit, comprise grounding transformer (1), arc suppression coil loop (2) and resistance loop (3), grounding transformer (1) is a three-phase transformer, the triple-phase line of one end is electrically connected with the triple-phase 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, arc suppression coil loop (2) and resistance loop (3) also are unified into connection circuit in the lump, the one end is connected in the neutral point of grounding transformer (1), other end ground connection also includes a high and low voltage switch device (4), and it is electrically connected with resistance (31).
2, single-phase earthing compensation pick-up unit according to claim 1 is characterized in that high and low voltage switch device (4) can be a kind of dual pressure control switch.
3, single-phase earthing compensation pick-up unit according to claim 2 is characterized in that dual pressure control switch can be a kind of SCR control switch, can also be a kind of relay isolating switch.
4, single-phase earthing compensation pick-up unit according to claim 1, it is characterized in that, high and low voltage switch device (4) comprises low-voltage control switch (41) and transformer (42), and resistance (31) is connected with low-voltage control switch (41), and is connected the secondary side of transformer (42).
5, single-phase earthing compensation pick-up unit according to claim 4 is characterized in that the secondary side winding of transformer (42) has a plurality of terminals, has a plurality of gauge tap (45) and a plurality of terminals to connect one to one.
6, single-phase earthing compensation pick-up unit according to claim 5 is characterized in that arc suppression coil loop (2) are attempted by the secondary side of transformer (42), and is electrically connected with gauge tap (45).
7, single-phase earthing compensation pick-up unit 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).
8, single-phase earthing compensation pick-up unit according to claim 7, it is characterized in that, control device (24) includes sample circuit (241), reference circuit (242), compare gate (243) and gauge tap (244), one end of sample circuit (241) is connected with main coil (41), the other end then is connected with an input end that compares gate (243), reference circuit (242) is connected with another input end that compares gate (243), relatively gate (243) output terminal is connected with the control end of gauge tap (244), total a plurality of gauge tap arranged side by side also respectively with flux change device (45) in a plurality of terminals connect one to one.
9, single-phase earthing compensation pick-up unit according to claim 1 is characterized in that arc suppression coil (21) and resistance (31) also connect, and be connected by the neutral point of high and low voltage switch device (4) with grounding transformer (1).
10, single-phase earthing compensation pick-up unit according to claim 1, it is characterized in that, also include controller (5), it is electrically connected with high and low voltage switch device (4), controller (5) comprises sampler (51), comparison means (52), standard apparatus (53), time set (54) and actuating unit (55), the output terminal of sampler (51) and standard apparatus (53) is connected with two input ends of comparison means (52) respectively, the output terminal of comparison means (52) connects the input end of time set (54) and the control end of actuating unit (55) respectively, the output terminal of time set (54) is connected with another input end of actuating unit (55) simultaneously, and the output control terminal of actuating unit (55) is connected with the control end of high and low voltage switch device (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03220138 CN2605579Y (en) | 2003-02-26 | 2003-02-26 | Single-phase grounding compensation detectnig apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03220138 CN2605579Y (en) | 2003-02-26 | 2003-02-26 | Single-phase grounding compensation detectnig apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2605579Y true CN2605579Y (en) | 2004-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03220138 Expired - Lifetime CN2605579Y (en) | 2003-02-26 | 2003-02-26 | Single-phase grounding compensation detectnig apparatus |
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| CN (1) | CN2605579Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390552C (en) * | 2005-12-12 | 2008-05-28 | 北京丹华昊博电力科技有限公司 | Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil |
| CN102170121A (en) * | 2011-04-21 | 2011-08-31 | 华北电力大学（保定） | Resonance eliminator with correcting potential transformer |
| CN102253265A (en) * | 2011-04-21 | 2011-11-23 | 华北电力大学（保定） | Method for compensating voltage measurement errors of voltage transformer with neutral point grounded via equivalent impedance device |
| CN104251959A (en) * | 2014-09-18 | 2014-12-31 | 云南电网公司电力科学研究院 | Method and device for positioning and detecting single-phase grounding fault of power distribution grid |
| CN105548817A (en) * | 2016-01-15 | 2016-05-04 | 广州思泰信息技术有限公司 | Single-phase grounding judgment method for 10kV overhead line |
-
2003
- 2003-02-26 CN CN 03220138 patent/CN2605579Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390552C (en) * | 2005-12-12 | 2008-05-28 | 北京丹华昊博电力科技有限公司 | Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil |
| CN102170121A (en) * | 2011-04-21 | 2011-08-31 | 华北电力大学（保定） | Resonance eliminator with correcting potential transformer |
| CN102253265A (en) * | 2011-04-21 | 2011-11-23 | 华北电力大学（保定） | Method for compensating voltage measurement errors of voltage transformer with neutral point grounded via equivalent impedance device |
| CN102170121B (en) * | 2011-04-21 | 2014-10-29 | 华北电力大学（保定） | Resonance eliminator with correcting potential transformer |
| CN104251959A (en) * | 2014-09-18 | 2014-12-31 | 云南电网公司电力科学研究院 | Method and device for positioning and detecting single-phase grounding fault of power distribution grid |
| CN104251959B (en) * | 2014-09-18 | 2017-03-08 | 云南电网公司电力科学研究院 | A kind of system for detecting and positioning one-phase earthing failure in electric distribution network |
| CN105548817A (en) * | 2016-01-15 | 2016-05-04 | 广州思泰信息技术有限公司 | Single-phase grounding judgment method for 10kV overhead line |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130226 Granted publication date: 20040303 |