CN203894345U - Monitor device for gap fuses of secondary neural points of voltage transformer - Google Patents
Monitor device for gap fuses of secondary neural points of voltage transformer Download PDFInfo
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- CN203894345U CN203894345U CN201420193627.9U CN201420193627U CN203894345U CN 203894345 U CN203894345 U CN 203894345U CN 201420193627 U CN201420193627 U CN 201420193627U CN 203894345 U CN203894345 U CN 203894345U
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- 230000007935 neutral effect Effects 0.000 claims abstract description 36
- 238000012806 monitoring device Methods 0.000 claims description 35
- 230000003321 amplification Effects 0.000 claims description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 17
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Abstract
The utility model provides a monitor device for gap fuses of secondary neural points of a voltage transformer. The monitor device is arranged on a ground loop formed by the secondary neural points and the gaps fuses of the voltage transformer. The monitor device comprises a current transformer, a current relay, and an alarm module. The current transformer is used for determining the breakdown condition of the gap fuses, and a first end and a second end of the current transformer are on the group loop. The current relay is used for determining the starting or stopping based on the breakdown condition of the gap fuses and internally provided with a built-in switch, and an input end of the current relay is connected with a third end of the current transformer. The alarm module is used for sending an alarm after determining that the current relay is started and the built-in switch is in the closed state, the alarm module is connected with an output end of the current replay, and the alarm module and the built-in switch form a feed through loop. With the adoption of the embodiment of the utility model, gap fuses of secondary neutral lines of voltage transformers in an electric network can be timely monitored, so that multi-point grounding can be found and alarms can be sent timely, maintainers can be timely informed, an object of eliminating potential safety hazards is achieved, and the safe and stable operation of the electric network is ensured.
Description
Technical field
The utility model relates to Relay Protection Technology in Power System field, relates in particular to the monitoring device of a kind of voltage transformer secondary neutral point gap insurance.
Background technology
The insurance of voltage transformer secondary neutral point gap is mainly to prevent that high voltage from sealing in the secondary circuit of voltage transformer (VT), cause this secondary circuit voltage to raise, thereby jeopardize secondary device, therefore by the mode of this gap insurance ground connection, can effectively prevent that the situation that jeopardizes secondary device from (hectovolt voltage just can puncture this gap insurance in full) occurring.Therefore when voltage transformer (VT) is normally worked, the insurance of this gap should be insulated with the earth, and occurs that superpotential time, gap insurance can be breakdown, at this moment connects voltage transformer secondary neutral line automatic earthing with gap insurance largely when voltage transformer secondary side.
According to the relevant anti-accident measures of electric system regulation: power current secondary windings of PT neutral point only and can only have one point earth.
At present, the secondary circuit between several groups of voltage transformer (VT) of same transformer station, can only shield neutral point (zero phase ground wire N600) one point earth at pulpit interface, and switch high-pressure place should disconnect or insure ground connection through gap.As shown in Figure 1, secondary circuit between several groups of voltage transformer (VT) of same transformer station shields neutral point 1 ' (N600) ground connection at pulpit interface, and the mode of employing gap, switch high-pressure place insurance 2 ' ground connection, if do not find in time gap insurance 2 ' breakdown, just there will be following situations: one, now largely with gap insurance 2 ' connection, make voltage transformer secondary neutral return path 3 ' above have two point (or multiple spot) ground connection, between earth point, produce potential difference (PD), generation current loop (as shown by the arrows in Figure 1), thereby affect the action rate of relay protection, two, when the neutral line exists after multipoint earthing, flow through the neutral line 3 ' electric current can rise suddenly very highly, generally reach 50mA(milliampere) more than.
Therefore, for the mode of insurance ground connection in employing gap, switch high-pressure place in the secondary circuit between several groups of voltage transformer (VT) of same transformer station, be badly in need of monitoring in time, alarm in time and notify in time maintainer to process, eliminate safe hidden trouble.
Utility model content
The utility model embodiment technical matters to be solved is, the monitoring device of a kind of voltage transformer secondary neutral point gap insurance is provided, guarantee that the insurance of line voltage mutual inductor secondary neutral line gap is monitored in time, reach and find the timely alarm of multipoint earthing, notify in time maintainer to process, the object eliminating safe hidden trouble, thus power network safety operation ensured.
In order to solve the problems of the technologies described above, the utility model embodiment provides the monitoring device of a kind of voltage transformer secondary neutral point gap insurance, is arranged on the ground loop of voltage transformer secondary neutral point and gap insurance formation, comprising:
Judge that for cross the current value of described ground loop according to induced flow the insurance of described gap punctures the current transformer of situation, the first end of described current transformer and the second end are positioned on described ground loop;
Determine for puncturing situation according to the gap insurance of described judgement the current relay that starts or close, described current relay comprises a built-in switch, and its input end is connected with the 3rd end of described current transformer; And
For determining that described current relay starts afterwards and described built-in switch is sent the alarm module of alarm in the time of closure state, described alarm module is connected with the output terminal of described current relay, and forms a connected loop with the built-in switch of described current relay.
Wherein, described alarm module comprises: electric battery, load, electric capacity, light emitting diode, integrated alarm circuit, power amplification circuit and loudspeaker; Wherein,
The positive pole of described electric battery is connected with the anodal and described power amplification circuit first input end of described integrated alarm circuit input end, described light emitting diode respectively by the built-in switch of described current relay;
One end of described electric capacity is connected with the negative pole of described integrated alarm circuit the first output terminal, described light emitting diode respectively, and the other end is connected with described power amplification circuit the second input end;
One end of described load is connected with the negative pole of described electric battery, and the other end is connected with one end of described integrated alarm circuit the second output terminal, described power amplification circuit the first output terminal and described loudspeaker respectively;
The other end of described loudspeaker is connected with described power amplification circuit the second output terminal.
Wherein, described current transformer is preset a current threshold, and when the current value of crossing when described current transformer induced flow is less than described current threshold, the built-in switch of described current relay is in open mode; When the current value of crossing when described current transformer induced flow is more than or equal to described current threshold, the built-in switch of described current relay is in closure state, and starts described alarm module alarm.
Wherein, described current threshold is 50 mA.
Wherein, described electric battery comprises at least one battery, and the output voltage of described electric battery is between 9V to 12V.
Wherein, the resistance value of described load is between 8 Ω to 10 Ω.
Wherein, described monitoring device is arranged between described voltage transformer secondary neutral point and the insurance of described gap, and the first end of the current transformer in described monitoring device is connected with the insurance of described gap with described neutral point respectively with the second end.
Wherein, described monitoring device is arranged between the insurance of described gap and the earth, and the first end of the current transformer in described monitoring device is connected with the earth with the insurance of described gap respectively with the second end.
Implement the utility model embodiment, there is following beneficial effect:
In the utility model embodiment, on the ground loop that is arranged on voltage transformer secondary neutral point and gap insurance formation due to monitoring device, can guarantee that the insurance of line voltage mutual inductor secondary neutral gap is monitored in time, after this gap insurance is breakdown, current transformer in monitoring device will sense that the current value flowing through on this ground loop is greater than default current threshold, thereby discovery multipoint earthing, starting current relay closed built-in switch, make alarm module and built-in switch form a connected loop, alarm in time, notify in time maintainer to process, the object eliminating safe hidden trouble, thereby guarantee power network safety operation.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, the accompanying drawing that obtains other according to these accompanying drawings still belongs to category of the present utility model.
Fig. 1 is that in prior art, breakdown current return schematic diagram is insured in voltage transformer secondary neutral point gap;
One monitoring point schematic diagram of the monitoring device of the voltage transformer (VT) gap insurance that Fig. 2 provides for the utility model embodiment;
Another monitoring point schematic diagram of the monitoring device of the voltage transformer (VT) gap insurance that Fig. 3 provides for the utility model embodiment;
The structural representation of the monitoring device of the voltage transformer (VT) gap insurance that Fig. 4 provides for the utility model embodiment;
Fig. 5 is the structural representation of alarm module in Fig. 4;
Fig. 6 is for insuring breakdown current return schematic diagram in the voltage transformer secondary neutral point gap that the utility model embodiment provides.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 2 and Figure 5, in the utility model embodiment, for the monitoring device of a kind of voltage transformer secondary neutral point gap insurance, this monitoring device 1 is arranged at voltage transformer secondary neutral point 4 and insures on 2 ground loops 3 that form with gap, can be arranged between voltage transformer secondary neutral point 4 and gap insurance 2 (as shown in Figure 2), or be arranged between gap insurance 2 and the earth (as shown in Figure 3).
This monitoring device 1 comprises: current transformer 11, current relay 12 and alarm module 13;
The first end L1 of described current transformer 11 and the second end L2 are positioned on ground loop 3, and this current transformer 11 judges that for cross the current value of ground loop 3 according to induced flow gap insurance 2 punctures situation; Wherein, in the time that monitoring device 1 is between neutral point 4 and gap insurance 2, the first end L1 of current transformer 11 is connected with gap insurance 2 with neutral point 4 respectively with the second end L2; In the time that monitoring device 1 is between gap insurance 2 and the earth, the first end L1 of current transformer 11 is connected with the earth with gap insurance 2 respectively with the second end L2;
Current relay 12 comprises a built-in switch k, and the input end of current relay 12 is connected with the 3rd end L3 of current transformer 11, and this current relay 12 determines that for puncturing situation according to the gap insurance 2 of judging current relay 12 starts or cuts out; And
Alarm module 13 is connected with the output terminal of current relay 12, and forms a connected loop with the built-in switch k of current relay 12, and this alarm module 13 starts afterwards for definite current relay 12 and built-in switch k sends alarm in the time of closure state.
Further, alarm module 13 comprises: electric battery, load, electric capacity, light emitting diode, integrated alarm circuit, power amplification circuit and loudspeaker; Wherein,
The positive pole of electric battery is connected with positive pole and the power amplification circuit first input end I1 of integrated alarm circuit input end b1, light emitting diode respectively by the built-in switch k of current relay;
One end of electric capacity is connected with the negative pole of integrated alarm circuit the first output terminal b2, light emitting diode respectively, and the other end is connected with power amplification circuit the second input end I2;
One end of load is connected with the negative pole of electric battery, and the other end is connected with one end of integrated alarm circuit the second output terminal b3, power amplification circuit the first output terminal O1 and loudspeaker respectively;
The other end of loudspeaker is connected with power amplification circuit the second output terminal O2.
Wherein, the electric battery in alarm module 13 comprises at least one battery, and the output voltage of this electric battery is at 9V(volt) to 12V(volt) between; The resistance value of the load in alarm module 13 is at 8 Ω (ohm) between 10 Ω (ohm), and this power amplification circuit and alarm integrated circuit all adopt general method for designing and conventional design circuit, realize respectively power amplification and alarm function.
At the default current threshold of current transformer 11 of this monitoring device 1, this current threshold is preferably 50 mA, and when the current value of crossing when current transformer 11 induced flows is less than current threshold, the built-in switch k of current relay 12 is in open mode; When the current value of crossing when current transformer 11 induced flows is more than or equal to current threshold, the built-in switch K of current relay 11 is in closure state, and start alarm module 12, make the timely alarm prompt flick of lamp of light emitting diode of this alarm module 12, the simultaneously loudspeaker prompting of sounding.
As shown in Figure 6, taking between the insurance of neutral point and gap as example, the principle of work of the monitoring device of the voltage transformer secondary neutral point gap insurance in the utility model embodiment is: in the time that voltage transformer secondary side has superpotential, make the insurance of secondary neutral gap breakdown, between voltage transformer secondary neutral point, there are 2 ground connection, between 2, there is potential difference (PD), form current loop (as shown by the arrows in Figure 6), now the current transformer in this monitoring device senses current value, and this current value is greater than current threshold default in current transformer, starting current relay, and the built-in switch of closed path relay, alarm module is started in time, lumination of light emitting diode, the simultaneously loudspeaker prompting of sounding.
Implement the utility model embodiment, there is following beneficial effect:
In the utility model embodiment, on the ground loop that is arranged on voltage transformer secondary neutral point and gap insurance formation due to monitoring device, can guarantee that the insurance of line voltage mutual inductor secondary neutral gap is monitored in time, after this gap insurance is breakdown, current transformer in monitoring device will sense that the current value flowing through on this ground loop is greater than default current threshold, thereby discovery multipoint earthing, starting current relay closed built-in switch, make alarm module and built-in switch form a connected loop, alarm in time, notify in time maintainer to process, the object eliminating safe hidden trouble, thereby guarantee power network safety operation.
Above disclosed is only a kind of preferred embodiment of the utility model, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim, still belongs to the scope that the utility model is contained.
Claims (8)
1. a monitoring device for voltage transformer secondary neutral point gap insurance, is characterized in that, is arranged on the ground loop of voltage transformer secondary neutral point and gap insurance formation, comprising:
Judge that for cross the current value of described ground loop according to induced flow the insurance of described gap punctures the current transformer of situation, the first end of described current transformer and the second end are positioned on described ground loop;
Determine for puncturing situation according to the gap insurance of described judgement the current relay that starts or close, described current relay comprises a built-in switch, and its input end is connected with the 3rd end of described current transformer; And
For determining that described current relay starts afterwards and described built-in switch is sent the alarm module of alarm in the time of closure state, described alarm module is connected with the output terminal of described current relay, and forms a connected loop with the built-in switch of described current relay.
2. monitoring device as claimed in claim 1, is characterized in that, described alarm module comprises: electric battery, load, electric capacity, light emitting diode, integrated alarm circuit, power amplification circuit and loudspeaker; Wherein,
The positive pole of described electric battery is connected with the anodal and described power amplification circuit first input end of described integrated alarm circuit input end, described light emitting diode respectively by the built-in switch of described current relay;
One end of described electric capacity is connected with the negative pole of described integrated alarm circuit the first output terminal, described light emitting diode respectively, and the other end is connected with described power amplification circuit the second input end;
One end of described load is connected with the negative pole of described electric battery, and the other end is connected with one end of described integrated alarm circuit the second output terminal, described power amplification circuit the first output terminal and described loudspeaker respectively;
The other end of described loudspeaker is connected with described power amplification circuit the second output terminal.
3. monitoring device as claimed in claim 2, is characterized in that, described current transformer is preset a current threshold, and when the current value of crossing when described current transformer induced flow is less than described current threshold, the built-in switch of described current relay is in open mode; When the current value of crossing when described current transformer induced flow is more than or equal to described current threshold, the built-in switch of described current relay is in closure state, and starts described alarm module alarm.
4. monitoring device as claimed in claim 3, is characterized in that, described current threshold is 50 mA.
5. monitoring device as claimed in claim 2, is characterized in that, described electric battery comprises at least one battery, and the output voltage of described electric battery is between 9V to 12V.
6. monitoring device as claimed in claim 2, is characterized in that, the resistance value of described load is between 8 Ω to 10 Ω.
7. the monitoring device as described in any one in claim 1 to 6, it is characterized in that, described monitoring device is arranged between described neutral point and the insurance of described gap, and the first end of the current transformer in described monitoring device is connected with the insurance of described gap with described neutral point respectively with the second end.
8. the monitoring device as described in any one in claim 1 to 6, it is characterized in that, described monitoring device is arranged between the insurance of described gap and the earth, and the first end of the current transformer in described monitoring device is connected with the earth with the insurance of described gap respectively with the second end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420193627.9U CN203894345U (en) | 2014-04-21 | 2014-04-21 | Monitor device for gap fuses of secondary neural points of voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420193627.9U CN203894345U (en) | 2014-04-21 | 2014-04-21 | Monitor device for gap fuses of secondary neural points of voltage transformer |
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| CN203894345U true CN203894345U (en) | 2014-10-22 |
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| CN201420193627.9U Expired - Lifetime CN203894345U (en) | 2014-04-21 | 2014-04-21 | Monitor device for gap fuses of secondary neural points of voltage transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270397A (en) * | 2018-11-26 | 2019-01-25 | 国网安徽省电力有限公司安庆供电公司 | A kind of direct-current grounding monitoring device |
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
| CN110196345B (en) * | 2019-07-09 | 2024-06-04 | 国网宁夏电力有限公司宁东供电公司 | Secondary neutral point protection device of voltage transformer |
-
2014
- 2014-04-21 CN CN201420193627.9U patent/CN203894345U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270397A (en) * | 2018-11-26 | 2019-01-25 | 国网安徽省电力有限公司安庆供电公司 | A kind of direct-current grounding monitoring device |
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
| CN110196345B (en) * | 2019-07-09 | 2024-06-04 | 国网宁夏电力有限公司宁东供电公司 | Secondary neutral point protection device of voltage transformer |
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