CN210007373U - transformer backup protection device accelerated by using near bus arc - Google Patents
transformer backup protection device accelerated by using near bus arc Download PDFInfo
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- CN210007373U CN210007373U CN201920892322.XU CN201920892322U CN210007373U CN 210007373 U CN210007373 U CN 210007373U CN 201920892322 U CN201920892322 U CN 201920892322U CN 210007373 U CN210007373 U CN 210007373U
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Abstract
The utility model provides an utilize transformer reserve protection device of nearly generating line electric arc acceleration, including reserve protection module, still include the arc light acceleration module, the arc light acceleration module is including accelerating power supply, arc light relay and a plurality of photoelectric switch tube, a plurality of photoelectric switch tube evenly set up in the generating line indoor for gather the indoor arc light signal of generating line, end after a plurality of photoelectric switch tube are parallelly connected is connected with accelerating power supply's anodal electricity, and the second end passes through relay control circuit and arc light relay's coil connection, for arc light relay's coil power supply, and arc light relay's normally open contact connects in parallel at time relay's normally open contact SJ _ 1's both ends, the utility model discloses utilize the indoor arc light signal of generating line to gather, needn't cooperate with subordinate power supply line protection module time delay in order to confirm the fault point, guarantee reserve protection module tripping operation immediately, prevent that 4 step accident evolution models in the background art from taking place, avoid burning the transformer.
Description
Technical Field
The utility model relates to a power supply safety field especially relates to kinds of transformer backup protection devices that utilize nearly generating line electric arc with higher speed.
Background
At present, the urban and rural 110Kv and the following distribution transformer substations in China generally adopt a closed bus structure, and the closed bus structure has the remarkable characteristics that:
as shown in fig. 1 below: the power supply 1 supplies power to the transformer 3, the outgoing side of the transformer 3 enters the bus chamber through the breaker, the bus chamber is connected to the low-voltage side bus, the low-voltage side bus is laid in the bus chamber 5 and connected to each lower circuit in the switch cabinet 4 through the breakers DL _1, DL _2 and DL _3 … … DL _ n, and finally the lower circuit supplies power to the terminal area.
The working principle of the backup protection module 2 is that as shown in figure 2, a coil LJ of a current relay is connected in series on a current transformer CT loop, the current CT transformer is used for detecting whether short-circuit current exists on the outgoing line side of the transformer 3, when the short-circuit current exists on the outgoing line side of the transformer 3, the coil LJ of the current relay is electrified, and then a normally open contact LJ _1 of the current relay is closed, and then the coil ZJ of the intermediate relay is electrified, so that a normally open contact ZJ _1 and a second normally open contact ZJ _2 of the intermediate relay are closed, and then a coil SJ of the time relay is electrified to enter a time delay state, and when the time delay state lasts to a preset time t, the normally open contact ZJ _1 of the time relay is electrified, and then the coil TQ _2 of the backup protection module is electrified, so that the backup protection module 2 is used for detecting whether short-circuit current exists on the outgoing line side of the transformer 3, and even the situation that the transformer 3 is burnt out is caused.
In the action process of the backup protection module 2, the reason that the backup protection module 2 detects that short-circuit current exists on the outgoing line side of the transformer 3 from the current transformer CT and does not immediately trip but trips after time delay t is that short-circuit current can occur on the outgoing line side of the transformer 3 no matter short circuit occurs at an F point in a bus room 5 or short circuit occurs at an FL point on a lower-stage circuit as shown in FIG. 1, if short circuit occurs at the F point in the bus room 5 at a certain time , the backup protection module 2 immediately trips the backup protection module 2 after detecting that short-circuit current exists on the bus in the bus room 5, no influence is generated, but if short circuit occurs at the FL point on the lower-stage circuit at a certain time , the backup protection module 2 immediately trips, all other lower-stage circuits are powered off, unnecessary loss and negative influence are caused, therefore, after detecting that short-circuit current exists on the outgoing line side of the transformer 3, the backup protection module 2 does not immediately trip but trips and delays time t time delay t time after detecting that short-circuit current exists on the outgoing line side of the transformer 3 (DL _ CT, DL _2, DL _ CT, TQ _3, the backup protection module does not normally open, and normally open circuit does not open, the backup protection module detects that short-trip-time of the transformer 3, and normally-trip.
However, summarizing a large number of burning accidents of the transformer 3 of 110Kv and below which occur in recent years, the following 4-step accident evolution model exists within the time t of the time delay of the backup protection module 2:
1: the initial fault may be single phase grounding, flashover or metal dropping within the bus bar compartment 5 causing bus arc within the bus bar compartment 5;
2: the electric arc generates high-temperature and high-pressure gas, and the high-temperature and high-pressure gas is diffused from a fault point to the adjacent switch cabinets 4 along the bus chamber 5;
3: causing insulation damage between phases and deteriorating as a short-circuit accident;
4. if the control power supply of the backup protection module 2 of the transformer 3 is damaged in the previous 3 steps, the backup protection module 2 fails, and the transformer 3 is difficult to be burnt; if the transformer 3 in the first 3 steps is not burnt, but the transformer 3 is subjected to the impact of short-circuit current for a long time within the time delay t of the backup protection module 2, and the transformer is seriously damaged if not completely burnt.
Through analyzing the 4-step accident evolution model, it is not difficult to find that the main reason for causing the 4-step accident is caused by the fact that the backup protection module 2 cannot trip in time within the time t of the delay of the backup protection module 2, but if the backup protection module 2 does not trip directly through the delay, all lower circuits are caused to be unnecessarily powered off, so that economic loss and social dissatisfaction are caused, and the problems are puzzled to the power industry for many years and become problems to be solved urgently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an kinds utilize transformer backup protection device of nearly generating line electric arc with higher speed, can utilize photoelectric switching tube to detect the indoor generating line of generating line and whether produce electric arc, and then control backup protection module tripping operation with higher speed, prevent to take place after being equipped with protection module time delay overlength, the condition that the transformer that leads to burns out.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
A backup protection device for a transformer accelerated by a near bus arc comprises a backup protection module and an arc acceleration module;
the arc light acceleration module comprises an acceleration power supply, an arc light relay and a plurality of photoelectric switch tubes;
the plurality of photoelectric switching tubes are uniformly arranged in the bus chamber and used for collecting arc signals in the bus chamber, the th end of the plurality of photoelectric switching tubes which are connected in parallel is electrically connected with the positive electrode of the accelerating power supply, the second end of the plurality of photoelectric switching tubes is connected with the coil of the arc relay through the relay control circuit and supplies power to the coil of the arc relay, and the normally open contacts of the arc relay are connected in parallel at two ends of the normally open contact SJ _1 of the time relay.
The relay control circuit adopts an optical coupler, the second ends of a plurality of photoelectric switch tubes which are connected in parallel are connected with the th end of a light emitter of the optical coupler, the second end of the light emitter of the optical coupler is electrically connected with the cathode of an accelerating power supply through a th resistor, the th end of a coil of the arc relay is electrically connected with the anode of the accelerating power supply, the second end of the arc relay is connected with the th end of a light receiver of the optical coupler, and the second end of the light receiver of the optical coupler is electrically connected with the cathode of the accelerating power supply through a second resistor.
The relay control circuit adopts a microprocessor, the second ends of the photoelectric switch tubes which are connected in parallel are electrically connected with the input end of the microprocessor through a signal processing circuit, the output end of the microprocessor is connected with the th end of the coil of the arc relay through a coil control circuit, and the second end of the coil of the arc relay is grounded.
The plurality of photoelectric switching tubes are all photoelectric switching tubes triggered by arc light.
The photoelectric switching tubes are triggered by ultraviolet rays.
The microprocessor adopts a single chip microcomputer or a PLC.
Firstly: arc light signals in a bus chamber can be collected by utilizing the photoelectric switching tube, the arc light signals do not need to be matched with a lower-level power supply line protection module in a delayed manner to determine a fault point, the backup protection module is ensured to be tripped immediately, the 4-step accident evolution model in the background technology is prevented from being generated, and the transformer is prevented from being burnt;
secondly, the existing equipment is convenient to reform, only a plurality of photoelectric switching tubes are arranged in the bus chamber, and then the photoelectric switching tubes are connected in parallel at two ends of a normally open contact SJ _1 of the time relay, so that is convenient to push;
and thirdly: the utility model discloses the direct target of protection is the transformer, but, after the tripping operation of reserve protection module, can also protect other equipment indoor and on the generating line.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional transformer protection module;
FIG. 2 is a schematic diagram of a conventional backup protection module;
FIG. 3 is a schematic view of the installation position of the photoelectric switch tube;
FIG. 4 is a schematic diagram of the present invention;
fig. 5 is a schematic diagram of an embodiment of the present invention;
fig. 6 is a schematic diagram of a second embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiment is a partial embodiment, not a whole embodiment, of the present invention.
As shown in figures 3 and 4, the transformer backup protection device utilizing near bus arc acceleration comprises a backup protection module 2 and an arc acceleration module, wherein the arc acceleration module comprises an acceleration power supply, an arc relay and a plurality of photoelectric switch tubes 6, the photoelectric switch tubes 6 are uniformly arranged in a bus chamber 5 and used for collecting arc signals in the bus chamber 5, the ends of the photoelectric switch tubes 6 connected in parallel are electrically connected with the anode of the acceleration power supply, the second ends of the photoelectric switch tubes are connected with the coil of the arc relay through a relay control circuit to supply power to the coil of the arc relay, and the normally open contacts of the arc relay are connected in parallel at two ends of the normally open contact SJ _1 of the time relay.
the theory of operation that utilizes transformer reserve protection device of nearly generating line electric arc acceleration do:
, when a fault occurs on a lower circuit which is outside the bus room 5 and is close to the bus, such as an FL point, the lower power supply line protection module DL _ n installed on the lower circuit and the backup protection module 2 of the transformer 3 can detect a short-circuit current, so the backup protection module 2 must delay t time, the lower power supply line protection module DL _ n is guaranteed to trip preferentially, the power outage area is reduced, and further the loss and the negative influence are reduced;
secondly, the method comprises the following steps: when short-circuit fault takes place in bus chamber 5, when F point, F point will produce electric arc, and then, the arc light that electric arc sent is detected by photoelectric switch pipe 6 that sets up in bus chamber 5, consequently photoelectric switch pipe 6 switches on, and then makes arc relay's coil electrified through relay control circuit, and then makes arc relay's normally open contact closed, with time relay's normally open contact SJ _1 short circuit, guarantee backup protection module 2 and trip immediately, prevent among the background art step accident evolution model take place, avoid transformer 3 to burn out.
Preferably, the photoelectric switching tubes 6 triggered by arc light are adopted as the plurality of photoelectric switching tubes 6, and step , the arc light generated by the bus arc is mainly ultraviolet light, the photoelectric switching tubes 6 triggered by ultraviolet light are adopted as the plurality of photoelectric switching tubes 6, so that the interference of visible light is avoided, and the arc light signals are rapidly and accurately identified, wherein the bus chamber 5 is closed in order to avoid the influence of visible light, and the selection of the number and the arrangement positions of the photoelectric switching tubes 6 is subject to the collection of all the arc light signals in the bus chamber 5 without dead angles.
In order to facilitate the technical solution of the present invention to be understood by those skilled in the art, the technical solution of the present invention will be described in steps with specific embodiments;
example :
as shown in FIG. 5, the relay control circuit adopts an optical coupler, a second end of a plurality of photoelectric switching tubes 6 (D1, D2 and D3 … … Dn) which are connected in parallel is connected with a end of a light emitter of the optical coupler, and a second end of the light emitter of the optical coupler is electrically connected with a cathode of an accelerating power supply through a resistor;
preferably, the accelerating power supply can adopt a direct-current power supply with the rated voltage of 24V;
the light emitter and the light receiver are packaged in by the optical coupler, the light emitter is generally a light emitting diode, the light receiver is generally a photosensitive semiconductor tube or a photosensitive resistor, and the like, wherein the light receiver is exemplified in the embodiment by using a photosensitive diode, when or more of a plurality of photoelectric switch tubes 6 (D1, D2 and D3 … … Dn) detect that an arc signal appears in the bus chamber 5, the photoelectric diode is conducted to supply power to the light emitter of the optical coupler, so that the light emitter of the optical coupler is electrified and emits light, the light receiver of the optical coupler is conducted due to the detection of light irradiation, and a coil of the arc relay is further electrified, and in step , a normally open contact of the arc relay is closed, a normally open contact SJ _1 of the time relay is short-circuited, and the backup protection module 2 is ensured to be tripped immediately.
Example two:
as shown in fig. 6, the relay control circuit adopts a microprocessor, the second ends of the multiple photoelectric switching tubes 6 (D1, D2, D3 … … Dn) which are connected in parallel are electrically connected with the input end of the microprocessor through a signal processing circuit, the output end of the microprocessor is connected with the th end of the coil of the arc relay through a coil control circuit, and the second end of the coil of the arc relay is grounded;
the signal acquired by the photoelectric switch tube 6 is an analog signal, so that the signal processing circuit comprises an A/D conversion unit, a filtering unit and an amplifying unit which are sequentially connected, the analog signal acquired by the photoelectric switch tube 6 is converted into an amplified digital signal and is sent to a microprocessor, the microprocessor controls the coil of the arc relay to be electrified through a coil control circuit, and steps are carried out, the normally open contact of the arc relay is closed, the normally open contact SJ _1 of the time relay is short-circuited, and the backup protection module 2 is guaranteed to be tripped immediately.
It should be noted that, in the above action process, the microprocessor may adopt a logic programmable processor such as a single chip or a PLC, and the microprocessor controls whether the relay coil is energized or not by using a signal sent by the sensor, which belongs to the prior art and is not described herein again.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; for example, the relay control circuit may also employ a switching device such as a transistor.
utilize transformer backup protection device with higher speed of nearly generating line electric arc's beneficial effect do:
firstly: the arc light acceleration module can be used for acquiring arc light signals in the bus chamber 5, so that a fault point can be determined in the bus chamber 5, the fault point does not need to be determined by time delay matching with a lower power supply line protection module, the backup protection module 2 is ensured to be tripped immediately, the 4-step accident evolution model in the background technology is prevented, and the transformer 3 is prevented from being burnt;
secondly, the existing equipment is convenient to reform, arc light signals in the bus chamber 5 can be acquired only by arranging a plurality of photoelectric switching tubes 6 in the bus chamber 5, and is convenient to push;
and thirdly: the utility model discloses the direct target of protection is transformer 3, but, after the tripping operation of reserve protection module 2, can also protect other equipment in the bus-bar room 5 and on the generating line.
Claims (6)
1, transformer backup protection devices accelerated by using near bus arc, which comprise a backup protection module and are characterized by also comprising an arc light acceleration module;
the arc light acceleration module comprises an acceleration power supply, an arc light relay and a plurality of photoelectric switch tubes;
the plurality of photoelectric switching tubes are uniformly arranged in the bus chamber and used for collecting arc signals in the bus chamber, the th end of the plurality of photoelectric switching tubes which are connected in parallel is electrically connected with the positive electrode of the accelerating power supply, the second end of the plurality of photoelectric switching tubes is connected with the coil of the arc relay through the relay control circuit and supplies power to the coil of the arc relay, and the normally open contacts of the arc relay are connected in parallel at two ends of the normally open contact SJ _1 of the time relay.
2. The backup protection device for a transformer accelerated by near bus arc according to claim 1, wherein the relay control circuit is an optical coupler, the second end of the multiple parallel-connected photoelectric switching tubes is connected to the th end of the light emitter of the optical coupler, the second end of the light emitter of the optical coupler is electrically connected to the negative electrode of the acceleration power source through the th resistor, the th end of the coil of the arc relay is electrically connected to the positive electrode of the acceleration power source, the second end of the coil is connected to the th end of the light receiver of the optical coupler, and the second end of the light receiver of the optical coupler is electrically connected to the negative electrode of the acceleration power source through the second resistor.
3. The backup protector for transformer using near bus arc acceleration as claimed in claim 1, wherein the relay control circuit is a microprocessor, the second ends of the multiple parallel-connected photoelectric switch tubes are electrically connected to the input end of the microprocessor through a signal processing circuit, the output end of the microprocessor is connected to the th end of the coil of the arc relay through a coil control circuit, and the second end of the coil of the arc relay is grounded.
4. The backup protector for transformer using near bus arc acceleration as claimed in claim 1, wherein each of said photoelectric switch tubes is an arc-triggered photoelectric switch tube.
5. The backup protection device for transformer using near bus arc acceleration according to claim 4, wherein each of the photoelectric switch tubes is triggered by ultraviolet light.
6. The transformer backup protection device using near bus arc acceleration according to claim 3, wherein the microprocessor is a single chip or PLC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920892322.XU CN210007373U (en) | 2019-06-14 | 2019-06-14 | transformer backup protection device accelerated by using near bus arc |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920892322.XU CN210007373U (en) | 2019-06-14 | 2019-06-14 | transformer backup protection device accelerated by using near bus arc |
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| CN210007373U true CN210007373U (en) | 2020-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311357A (en) * | 2019-06-14 | 2019-10-08 | 国网河南省电力公司灵宝市供电公司 | A kind of Backup Protection Device for Transformer accelerated using nearly bus electric arc |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311357A (en) * | 2019-06-14 | 2019-10-08 | 国网河南省电力公司灵宝市供电公司 | A kind of Backup Protection Device for Transformer accelerated using nearly bus electric arc |
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