CN201838977U - Neutral line burn-out prevention automatic protection device of low-voltage distribution network - Google Patents
Neutral line burn-out prevention automatic protection device of low-voltage distribution network Download PDFInfo
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- CN201838977U CN201838977U CN2010205983162U CN201020598316U CN201838977U CN 201838977 U CN201838977 U CN 201838977U CN 2010205983162 U CN2010205983162 U CN 2010205983162U CN 201020598316 U CN201020598316 U CN 201020598316U CN 201838977 U CN201838977 U CN 201838977U
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- neutral line
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Abstract
The utility model discloses a neutral line burn-out prevention automatic protection device of a low-voltage distribution network. A current transformer (5) is arranged on a neutral line of the low-voltage distribution network and is connected with a current relay (7) by an ammeter (6); one output end of the current relay (7) is connected with a conversion switch (8), and the other output end of the current relay (7) is connected with one end of a coil of a time relay (9); the other end of the coil of the time relay (9) is connected with one end of a coil of an alternating-current contactor (10) installed on a three-phase power line of the low-voltage distribution network and is connected on the neutral line in series; a connecting point of a normally closed delay switch of the time relay (9) is connected with the other end of the coil of the alternating-current contactor (10), and another connecting point is connected with the conversion switch (8) by a programmable temperature control instrument (2); the conversion switch (8) is installed on the low-voltage distribution network; and the input end of the programmable temperature control instrument (2) is connected with infrared temperature measuring equipment (1).
Description
One. technical field: the utility model relates to a kind of 380V low-voltage distribution network and normally moves automatic safety device, particularly relates to the anti-automatic safety device that blows of a kind of low-voltage distribution network neutral line.
Two. background technology: the low-voltage distribution network neutral line exists the cross section less than the phase line cross section at present, and the neutral line is connected unstable deficiency with the low voltage distribution transformer binding post, add asymmetric resistive, perceptual, the capacitive load influence of three-phase, the phasing not of uniform size of each phase current etc., also not necessarily 120 ° of phase differences, three-phase current sum this moment (neutral current) is non-vanishing, and the size of neutral current just might surpass a wherein phase current size.Triple-frequency harmonics will be a harmonic wave sum on each phase line on the neutral line on the other hand, add the unsymmetrical current of first-harmonic, current effective value on the neutral line might near or even surpass phase current, this often causes the neutral line to blow, thereby cause burning out the accident of a large amount of single-phase electric devices, cause unnecessary economic loss to the resident.
Three. the utility model content:
Technical problem to be solved in the utility model is: overcome the deficiencies in the prior art, provide a kind of with low cost, device to connect simple, safe and reliable, as can the to realize running status monitoring in real time anti-automatic safety device that blows of the low-voltage distribution network neutral line.
The technical solution of the utility model is: the anti-automatic safety device that blows of a kind of low-voltage distribution network neutral line; contain current transformer (5) and A.C. contactor (10); described A.C. contactor (10) is installed on the three-phase power line of low-voltage network; described current transformer (5) is installed on the neutral line of low-voltage network; described current transformer (5) is connected with current relay (7) by ammeter (6); an output of described current relay (7) is connected with change over switch (8); its another output is connected with an end of the coil of the time relay (9); the other end of the coil of the described time relay (9) is connected with an end of the coil of described A.C. contactor (10) and is serially connected on the neutral line; normally closed delay switch two contacts of the described time relay (9) are connected with described change over switch (8) with the other end of the coil of described A.C. contactor (10) respectively, and it is online that described change over switch (8) is installed in low-voltage distribution.
Be serially connected with the normally closed switch of temperature controller able to programme (2) between the normally closed delay switch of the described time relay (9) and the described change over switch (8), the input of described temperature controller able to programme (2) is connected with infrared measurement of temperature equipment (1), and this infrared measurement of temperature equipment (1) is installed in distribution transformer low-pressure side binding post and neutral line junction.Described temperature controller able to programme (2) is provided with audible-visual annunciator and wireless base station apparatus.
The beneficial effects of the utility model are:
1, the utility model can prevent effectively that the load unbalanced or newly-increased load of the three characteristics of the middle term from too concentrating and cause that to flow through neutral current excessive; and the workmen is lack of standardization at distribution transformer low-pressure side neutral line binding post and neutral line junction joint technology; lack a sense of responsibility; cause unreliable the connection, really realize the anti-automatic protection functions that blows of the low-voltage distribution network neutral line.
2, the utility model is realized current monitoring and monitoring temperature dual fail-safe, improves the safety in utilization of low-voltage network more, thereby avoids burning out the accident of a large amount of single-phase electric devices, reduces the unnecessary economic loss that causes to the resident.
3, the utlity model has with low cost, device connect simple, safe and reliable, can realize characteristics such as running status monitoring in real time, be easy to popularization, economic benefit is good.
Four. description of drawings:
Fig. 1 is the anti-structural representation that blows automatic safety device of the low-voltage distribution network neutral line.
Five. embodiment:
Embodiment: referring to Fig. 1, among the figure, 1-infrared measurement of temperature equipment, 2-temperature controller able to programme, 3-audible-visual annunciator, 4-teletransmission PC and mobile phone, 5-current transformer, 6-ammeter, 7-current relay, 8-change over switch, the 9-time relay, 10-A.C. contactor, 11-fuse, 12-isolating switch.
The low-voltage distribution network neutral line prevents that blowing automatic safety device utilizes two kinds of approach to realize, it is installed in current transformer 5 on the low-voltage distribution network neutral line on the one hand, monitoring stream is crossed neutral current, by Current Transformer Secondary lead-in wire serial connection ammeter 6 and current relay 7, when flowing through current relay 7 setting current values and allow electric current for a long time (after the current transformer conversion) greater than this lead, current relay 7 auxiliary contacts make the coil of the time relay 9 charged relay 9 coil start-up time; Normally closed time-delay break will be delayed time and be disconnected the coil blackout that makes A.C. contactor 10, thereby all loads of main contact cutoff low distribution by A.C. contactor 10, when electric current was lower than this lead and allows electric current for a long time, A.C. contactor 10 restored electricity automatic adhesive.If there is potential safety hazard in circuit, after hidden danger was eliminated, the personnel of power supply station only needed with change over switch 8 is placed open position, and the coil of the time relay 9 cuts off the power supply automatically, and auxiliary contact will automatically reset; Automatically recovering needs change over switch 8 is placed on-position once more before the normal power supply.It is often to blow fault point (distribution transformer low-pressure side binding post and neutral line junction) easily by the neutral line in the infrared measurement of temperature equipment 1 aligning actual motion on the other hand, infrared measurement of temperature equipment 1 usefulness lead is linked to each other with controller 2 able to programme, realize that monitor temperature sends temperature controller 2 able to programme to, temperature is set in equipment heating allows critical temperature, when temperature goes beyond the scope, temperature controller controller 2 normally closed contacts able to programme are opened the coil blackout that makes A.C. contactor 10, all loads of main contact cutoff low distribution by A.C. contactor 10 send sound and light alarm by audible-visual annunciator 3 simultaneously.After treating that temperature reduces, Programmable Temperature controller 2 normally closed contacts automatically reset, and make A.C. contactor 10 automatic adhesives, recover the normal power supply running status.
Temperature controller 2 able to programme can also be communicated to wireless base station apparatus by RS232/RS485 with measuring temperature, and then passes through the teletransmission of GSM/GPRS network to the personnel of power supply station computer or mobile phone, effectively monitors low-voltage distribution network neutral line junction operating condition.Thoroughly eliminated the passive situation that the low-voltage distribution network neutral line burns, realized that really a kind of neutral line that prevents newly-increased in the low-voltage distribution network system blows automatic safety device.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.
Claims (3)
1. a low-voltage distribution network neutral line prevents blowing automatic safety device; contain current transformer (5) and A.C. contactor (10); it is characterized in that: described A.C. contactor (10) is installed on the three-phase power line of low-voltage network; described current transformer (5) is installed on the neutral line of low-voltage network; described current transformer (5) is connected with current relay (7) by ammeter (6); an output of described current relay (7) is connected with change over switch (8); its another output is connected with an end of the coil of the time relay (9); the other end of the coil of the described time relay (9) is connected with an end of the coil of described A.C. contactor (10) and is serially connected on the neutral line; normally closed delay switch two contacts of the described time relay (9) are connected with described change over switch (8) with the other end of the coil of described A.C. contactor (10) respectively, and it is online that described change over switch (8) is installed in low-voltage distribution.
2. the anti-automatic safety device that blows of the low-voltage distribution network neutral line according to claim 1; it is characterized in that: the normally closed switch that is serially connected with temperature controller able to programme (2) between the normally closed delay switch of the described time relay (9) and the described change over switch (8); the input of described temperature controller able to programme (2) is connected with infrared measurement of temperature equipment (1), and this infrared measurement of temperature equipment (1) is installed in distribution transformer low-pressure side binding post and neutral line junction.
3. the low-voltage distribution network neutral line according to claim 2 is anti-to blow automatic safety device, and it is characterized in that: described temperature controller able to programme (2) is provided with audible-visual annunciator and wireless base station apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205983162U CN201838977U (en) | 2010-11-10 | 2010-11-10 | Neutral line burn-out prevention automatic protection device of low-voltage distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205983162U CN201838977U (en) | 2010-11-10 | 2010-11-10 | Neutral line burn-out prevention automatic protection device of low-voltage distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201838977U true CN201838977U (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205983162U Expired - Fee Related CN201838977U (en) | 2010-11-10 | 2010-11-10 | Neutral line burn-out prevention automatic protection device of low-voltage distribution network |
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| CN (1) | CN201838977U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065035A (en) * | 2014-06-26 | 2014-09-24 | 河南开启电力实业有限公司 | Distribution transformer neutral line breaking protection device |
| CN105102995A (en) * | 2013-10-02 | 2015-11-25 | 韩国水力原子力株式会社 | Device for detecting open phase of connection line of standby transformer in nuclear power plant by using rogowski coil |
| CN107462761A (en) * | 2017-07-18 | 2017-12-12 | 上海海能信息科技有限公司 | Distribution transforming burn-out-proof grading forewarning system method based on multivariable monitoring multi thresholds constraint |
-
2010
- 2010-11-10 CN CN2010205983162U patent/CN201838977U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105102995A (en) * | 2013-10-02 | 2015-11-25 | 韩国水力原子力株式会社 | Device for detecting open phase of connection line of standby transformer in nuclear power plant by using rogowski coil |
| US9714974B2 (en) | 2013-10-02 | 2017-07-25 | Korea Hydro & Nuclear Power Co., Ltd | Device for detecting open phase of connection line of standby transformer in nuclear power plant by using Rogowski coil |
| CN105102995B (en) * | 2013-10-02 | 2017-09-12 | 韩国水力原子力株式会社 | The equipment of the disconnected phase of connecting line for detecting the spare transformer in nuclear power station by using Rogowski coil |
| CN104065035A (en) * | 2014-06-26 | 2014-09-24 | 河南开启电力实业有限公司 | Distribution transformer neutral line breaking protection device |
| CN107462761A (en) * | 2017-07-18 | 2017-12-12 | 上海海能信息科技有限公司 | Distribution transforming burn-out-proof grading forewarning system method based on multivariable monitoring multi thresholds constraint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110518 Termination date: 20111110 |