CN204008951U - A kind of secondary circuit 3U0 broken string alarm device - Google Patents
A kind of secondary circuit 3U0 broken string alarm device Download PDFInfo
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- CN204008951U CN204008951U CN201420497090.5U CN201420497090U CN204008951U CN 204008951 U CN204008951 U CN 204008951U CN 201420497090 U CN201420497090 U CN 201420497090U CN 204008951 U CN204008951 U CN 204008951U
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Abstract
The utility model relates to a kind of secondary circuit 3U0 broken string alarm device, comprise the voltage transformer (VT) LHL, the LHN that are connected to main system L phase, S phase, N3 phase and are connected to L phase, N3 phase, respectively be provided with mutually current relay LJL, a LJN at voltage transformer (VT) LHL, LHN secondary side to L phase and the N3 of relay protection chamber cable, and respectively connect mutually pull-up resistor 1FR, 2FR at L-S phase, S-N3; When normal, L-S voltage between phases is 100V, and S-N3 be mutually also 100V, and current relay is in operating state, only has in L phase, S phase and N3 the phase time that breaks mutually, just can return, and report to the police by control loop.The utility model has the advantages that: realized phase breaking alarm, effectively prevented the generation of malfunction, convenient maintenance.
Description
Technical field
The utility model relates to a kind of secondary circuit 3U0 broken string alarm device, for two, three disconnected supervision mutually of voltage transformer (VT) of 66KV and above electric system.
Background technology
At present, the Secondary Circuit of Potential Transformer that China's electric system is used is in operation single-phase earthing and phase fault easily occurs, and causes protective device ac voltage losing, and decompression causes the malfunction of protective device, causes unnecessary loss.Due to the existence of this unfavorable factor, many protective devices have all been considered broken string locked loop in the time of design.But the right title broken string of locked loop produces effect very much, has just lost effect and voltage transformer secondary side generation three-phase is broken completely, can not effectively prevent the generation of malfunction.
According to statistics because disconnected meeting makes voltage transformer (VT) three times without residual voltage, so in the time of electric system generation earth fault, protective device miss operation, causes large-area power outage, causes unnecessary loss to industrial or agricultural.Now lift two concrete instance explanations.
1. one nine six zero years; Shou Shan electric substation of Anshan Power Administration; the first line of water of 220KV II type wiring, the first line of saddle: in the time of the first line circuit of water generation earth fault; due to three disconnected phases of Shou Shan electric substation voltage transformer (VT); residual voltage is disappeared, again without disconnected phase supervisory relay, cause the first line protection of offside saddle action; cause two circuit full cut-ofves, cause Shou Shan electric substation to have a power failure.
2. one, No. two lines of one or nine 220KV of electric substation of Li Shi stockaded village of year July 1st Fushun power administration Lee of the Liao Dynasty: in the time of a loop line generation earth fault, due to the disconnected phase of residual voltage, make one, No. two horizontal poor trippings of line direction of distant Lee, cause one, No. two line full cut-ofves of distant Lee.
Also have similarity, will not enumerate.Trace it to its cause, only have very little unbalance voltage when normal, voltage transformer (VT) need connect with hundreds of rice cable to relay protection chamber, and cable phenomenon mutually disconnected or terminal row loose contact happens occasionally like this, causes electric system generation earth fault.And after fault, there is no residual voltage, and causing relay protection miss operation, excision faulty equipment that can not be correct, has caused the large-area power outage of electric system, has caused unnecessary loss to industrial or agricultural.Therefore need a kind of device that can send out in time phase breaking alarm signal, avoid the generation of above-mentioned event.
Summary of the invention
For overcoming the deficiencies in the prior art, the purpose of this utility model is to provide a kind of secondary circuit 3U0 broken string alarm device, can send out in time phase breaking alarm signal, effectively prevents the generation of malfunction.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of secondary circuit 3U0 broken string alarm device, comprise the voltage transformer (VT) LHL, the LHN that are connected to main system L phase, S phase, N3 phase and are connected to L phase, N3 phase, respectively be provided with mutually current relay LJL, a LJN at voltage transformer (VT) LHL, LHN secondary side to L phase and the N3 of relay protection chamber cable, and respectively connect mutually pull-up resistor 1FR, 2FR at L-S phase, S-N3; When normal, L-S voltage between phases is 100V, and S-N3 be mutually also 100V, and current relay is in operating state, only has in L phase, S phase and N3 the phase time that breaks mutually, just can return, and report to the police by control loop.
Voltage relay YJ is set mutually with locking at the secondary Ua2-N2 of voltage transformer (VT).
S at relay protection chamber cable arranges intermediate relay ZJ between pull-up resistor 1FR, 2FR, to disconnect S phase power supply.
Described control loop is reported to the police by light emitting diode.
Compared with prior art, the beneficial effects of the utility model are:
Current relay returns, and when disconnected phase time occurs residual voltage, the 1LED when red of control loop, can send disconnected phase alarm at once, and prompting duty personnel processes open phase fault in time, avoids relay protection for a long time in without residual voltage state; When 3U0L-N is not when short circuit, in the time of system generation earth fault, the YJ0 actuating of relay, the 2LED green light of control loop, illustrates not short circuit of 3U0 L-N, works on.Realize phase breaking alarm with this, effectively prevented the generation of malfunction, convenient maintenance.
Brief description of the drawings
Fig. 1 is alternating-current electric schematic diagram.
Fig. 2 is secondary loop current relay wiring schematic diagram.
Fig. 3 is control loop elementary diagram.
Embodiment
Below in conjunction with Figure of description, the utility model is described in detail, but should be noted that enforcement of the present utility model is not limited to following embodiment.
See Fig. 1-Fig. 3, a kind of secondary circuit 3U0 broken string alarm device, comprise the voltage transformer (VT) LHL, the LHN that are connected to main system L phase, S phase, N3 phase and are connected to L phase, N3 phase, respectively be provided with mutually current relay LJL, a LJN at voltage transformer (VT) LHL, LHN secondary side to L phase and the N3 of relay protection chamber cable, and respectively connect mutually pull-up resistor 1FR, 2FR at L-S phase, S-N3; When normal, L-S voltage between phases is 100V, and S-N3 be mutually also 100V, and current relay LJL, LJN be in operating state, only has in L phase, S phase and N3 the phase time that breaks mutually, just can return, and report to the police by control loop.For example: the L phase cable phase of breaking, current relay LJL becomes return state by operating state, sends out alarm signal (light emitting diode 1LED glows) by control loop.
When preventing voltage transformer (VT) power failure operation, make current relay LJL, LJN become return state by operating state; Or electrical network A is while mutually single-phase earthing occurring, voltage transformer (VT) primary voltage Ua1 degradation, makes current relay LJL become return state by operating state, and mistake is sent out an alarm signal; Carry out locking therefore install mutually a voltage relay YJ additional at the secondary Ua2-N2 of relay protection chamber voltage transformer (VT), also can realize and monitor the disconnected phase of voltage transformer secondary Ua2N2 and the disconnected phase of Ub2U2c, and send disconnected phase signals alarm.
For preventing voltage transformer (VT) L phase or N3 disconnected phase time mutually; seal in residual voltage 3U0 by S through pull-up resistor 1FR or 2FR; impact protection malfunction, therefore disconnect S phase power supply at S to the alarm normally closed contact ZJ1 and the ZJ2 that add two intermediate relay ZJ between pull-up resistor 1FR and 2FR.
Current relay LJL, LJN are in the time that rated voltage is 100V, and return voltage is 45V, 1kf=0.45; Voltage relay YJ is in the time that rated voltage is 58V, return voltage is 42V, 1kf=0.724, in the time there is A phase single-line to ground fault in primary system, so being Kk=Ukf/1kf=0.724/0.45 ≈ 1.6 > 1.3 voltage relay, safety factor first returns to reliably locking.Two current relay LJL, LJN impedance sums are less than 0.35 Ω, and (when 3U0 is 100V, its maximum load current is about 2A, and load-carrying impedance is about 50 Ω.The pressure drop of this device is 0.35/50X100%=0.7%, minimum to the pressure drop affects in whole loop).
See Fig. 1-Fig. 3, alarm signal direct supply is power plant or Substation control ring current 110V or 220V, taking 220V power supply as example, when normal in DC power supply circuit, the normally closed contact of LJL, LJN is off-state temporarily, and YJ voltage relay normally opened contact is in make-position.When L phase or N disconnected phase time mutually, corresponding LJL or LJN current relay become return state by operating state, and YJ normally opened contact is connected and passed through to normally closed contact, light emitting diode 1LED starts intermediate relay ZJ.ZJ1 normally opened contact closure is sent disconnected phase alarm signal.After intermediate relay ZJ action, go to short circuit current relay LJL, LJN, voltage relay YJ contact to make intermediate relay ZJ self-sustaining by ZJ2 normally opened contact, prevent the discontinuous phase of cable wink or terminal row loose contact shake signalling, search disconnected phase even if be not easy to duty personnel, after light emitting diode 2LED action, sending green glow represents, intermediate relay ZJ is to select direct current 110V two to open two to close relay through series connection dropping resistor Rv access direct supply, and coil two ends a silicon diode produce back-emf while preventing intermediate relay ZJ power-off.When after disconnected phase accident treatment, duty personnel can click involution button F A, and intermediate relay ZJ is returned, and light emitting diode 1LED, 2LED extinguish simultaneously, and ZJ1 contact disconnects, and stops signaling.
The utility model current relay returns, and when disconnected phase time occurs residual voltage, the 1LED when red of control loop, can send disconnected phase alarm at once, and prompting duty personnel processes open phase fault in time, avoids relay protection for a long time in without residual voltage state; When 3U0L-N is not when short circuit, in the time of system generation earth fault, the YJ0 actuating of relay, the 2LED green light of control loop, illustrates not short circuit of 3U0 L-N, works on.Realize phase breaking alarm with this, effectively prevented the generation of malfunction, convenient maintenance.
Claims (4)
1. a secondary circuit 3U0 broken string alarm device, comprise the voltage transformer (VT) LHL, the LHN that are connected to main system L phase, S phase, N3 phase and are connected to L phase, N3 phase, it is characterized in that, respectively be provided with mutually current relay LJL, a LJN at voltage transformer (VT) LHL, LHN secondary side to L phase and the N3 of relay protection chamber cable, and respectively connect mutually pull-up resistor 1FR, 2FR at L-S phase, S-N3; When normal, L-S voltage between phases is 100V, and S-N3 be mutually also 100V, and current relay is in operating state, only has in L phase, S phase and N3 the phase time that breaks mutually, just can return, and report to the police by control loop.
2. a kind of secondary circuit 3U0 broken string alarm device according to claim 1, is characterized in that, voltage relay YJ is set mutually with locking at the secondary Ua2-N2 of voltage transformer (VT).
3. a kind of secondary circuit 3U0 broken string alarm device according to claim 1, is characterized in that, between pull-up resistor 1FR, 2FR, intermediate relay ZJ is set, to disconnect S phase power supply at the S of relay protection chamber cable.
4. a kind of secondary circuit 3U0 broken string alarm device according to claim 1, is characterized in that, described control loop is reported to the police by light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420497090.5U CN204008951U (en) | 2014-08-29 | 2014-08-29 | A kind of secondary circuit 3U0 broken string alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420497090.5U CN204008951U (en) | 2014-08-29 | 2014-08-29 | A kind of secondary circuit 3U0 broken string alarm device |
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| Publication Number | Publication Date |
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| CN204008951U true CN204008951U (en) | 2014-12-10 |
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| CN201420497090.5U Expired - Fee Related CN204008951U (en) | 2014-08-29 | 2014-08-29 | A kind of secondary circuit 3U0 broken string alarm device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372544A (en) * | 2014-08-29 | 2016-03-02 | 国家电网公司 | Secondary loop 3U0 line-breaking alarm apparatus |
| CN107884665A (en) * | 2017-11-28 | 2018-04-06 | 中国大唐集团科学技术研究院有限公司西北分公司 | Prevent the device and method of generator outlet voltage transformer turn-to-turn short circuit false tripping machine |
-
2014
- 2014-08-29 CN CN201420497090.5U patent/CN204008951U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372544A (en) * | 2014-08-29 | 2016-03-02 | 国家电网公司 | Secondary loop 3U0 line-breaking alarm apparatus |
| CN105372544B (en) * | 2014-08-29 | 2018-02-27 | 国家电网公司 | A kind of secondary circuit 3U0 broken strings alarm device |
| CN107884665A (en) * | 2017-11-28 | 2018-04-06 | 中国大唐集团科学技术研究院有限公司西北分公司 | Prevent the device and method of generator outlet voltage transformer turn-to-turn short circuit false tripping machine |
| CN107884665B (en) * | 2017-11-28 | 2024-03-08 | 大唐西北(西安)电力试验研究院有限公司 | Device and method for preventing turn-to-turn short circuit of generator outlet voltage transformer from mistakenly tripping |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: Anshan Power Supply Company of State Grid Liaoning Electric Power Company Patentee after: State Grid Corporation of China Co-patentee after: LIAONING LINKEPOWER ENGINEERING TECHNOLOGY CO.,LTD. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: Anshan Power Supply Company of State Grid Liaoning Electric Power Company Patentee before: State Grid Corporation of China Co-patentee before: ANSHAN LINKEPOWER ENGINEERING TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |