CN110739685B - Uninterrupted power operation method for cable type power distribution network - Google Patents
Uninterrupted power operation method for cable type power distribution network Download PDFInfo
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- CN110739685B CN110739685B CN201910978191.1A CN201910978191A CN110739685B CN 110739685 B CN110739685 B CN 110739685B CN 201910978191 A CN201910978191 A CN 201910978191A CN 110739685 B CN110739685 B CN 110739685B
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Abstract
The invention relates to a non-power-outage operation method for a cable type power distribution network. A non-power-outage operation method for a cable type power distribution network comprises the following steps: selecting a transformer without power failure as a power taking end transformer; laying a bypass cable between the power equipment at the power-saving end and the power-taking end transformer; connecting one end of a bypass cable to a power receiving point of power equipment at a power protection end, and connecting the other end of the bypass cable to a high-voltage side copper bar of a power taking end transformer to form a temporary power taking loop; and performing power supply conversion. According to the invention, the high-voltage side copper bar of the distribution transformer is selected as the power taking point, so that the problem that the uninterrupted operation cannot be carried out when the power source at the power taking side is short of accessible points such as a standby cabinet, a contact cabinet formed by power conversion and the like is solved, the operation application range of the uninterrupted operation can be effectively expanded, and the power supply reliability is improved.
Description
Technical Field
The invention relates to the technical field of power distribution operation of a power grid, in particular to a non-power-outage operation method of a cable type power distribution network.
Background
With the rapid development of economy and the increasing improvement of the living standard of people, the requirement of customers on the power supply reliability is higher and higher. The uninterrupted operation is used as an important means for improving the power supply reliability in the power distribution network, and is more and more widely applied nationwide. In the actual operation process of uninterrupted operation, the accessibility of the overhead line is strong, so that the proportion of uninterrupted operation in the 10kV overhead power distribution network is high; however, due to the inaccessibility of the cable body, the traditional technology requires that a non-power-outage operation of a 10kV cable type power distribution network is carried out by a switch cabinet which is not put into operation, such as a spare cabinet, a connection cabinet formed by power transfer and the like, so as to be used as an access point for power taking. Therefore, when the switch cabinet is not available, the cable distribution network cannot be operated without power outage.
Disclosure of Invention
Therefore, the problem that the cable type power distribution network cannot carry out uninterrupted power operation when no switch cabinet is available is needed, and the uninterrupted power operation method of the cable type power distribution network is provided.
A non-power-outage operation method for a cable type power distribution network comprises the following steps:
selecting a transformer without power failure as a power taking end transformer;
laying a bypass cable between the power-saving end power equipment and the power-taking end transformer;
connecting one end of the bypass cable to a power receiving point of the power protection end electric equipment, and connecting the other end of the bypass cable to a high-voltage side copper bar of the power taking end transformer to form a temporary power taking loop;
and performing power supply conversion.
In one embodiment, the power protection terminal power equipment comprises one or more of a power protection terminal transformer, a switch cabinet, a bypass ring main unit and a ring main unit vehicle.
In one embodiment, the power receiving point of the power protection terminal transformer comprises a high-voltage side copper bar of the power protection terminal transformer.
In one embodiment, in the step of forming the temporary power-taking loop, one end of the bypass cable is connected to a power-receiving point of the power-saving end power equipment, and the other end of the bypass cable is connected to a high-voltage side copper bar of the power-taking end transformer, and the connection mode of the bypass cable includes live connection.
In one embodiment, the two-end connector of the bypass cable comprises a quick-connect-disconnect connector.
In one embodiment, after the step of forming the temporary power-taking loop by connecting one end of the bypass cable to the power-receiving point of the power-saving end power equipment and connecting the other end of the bypass cable to the high-voltage side copper bar of the power-taking end transformer, the method further includes the steps of:
respectively placing connectors at two ends of the laid bypass cable at a suspension position;
performing insulation detection on the assembled temporary electricity taking loop;
and fully discharging the temporary electricity taking loop by using an insulated discharge device.
In one embodiment, the step of selecting the uninterruptible transformer as the power-taking-end transformer includes:
selecting a non-power-off transformer;
detecting the size of the load on the uninterrupted transformer, and comparing the detected size with a set threshold value;
and when the load on the uninterrupted transformer is detected to be lower than the set threshold value, taking the uninterrupted transformer as the power taking end transformer.
In one embodiment, the bypass cable further comprises a bypass switch.
In one embodiment, the step of performing power supply transfer further includes the following steps:
setting a certain sampling time interval;
detecting the load of the temporary power taking loop which is performing power supply switching according to the sampling time interval, and comparing the load with a set safety threshold value;
and when the load of the temporary electricity taking loop is detected to be larger than the safety threshold, stopping power supply.
In one embodiment, the step of performing power supply transfer further comprises the steps of:
carrying out phase checking on the power taking end transformer and the power protection end power equipment;
and when detecting that the phases of the power taking end transformer and the power protection end electric equipment are different, disconnecting the bypass cable, and adjusting the phases after fully discharging.
According to the uninterrupted power operation method of the cable type power distribution network, the high-voltage side copper bar of the distribution transformer is selected as the power taking point, the problem that uninterrupted power operation cannot be carried out when the power taking side power supply lacks of accessible points such as a standby cabinet, a contact cabinet and a contact cabinet formed by power transfer is solved, the operation application range of uninterrupted power operation can be effectively expanded, and the power supply reliability is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for operating a cable-type power distribution network without power outage in an embodiment;
FIG. 2 is a schematic diagram of an embodiment of a power conservation system for a single transformer during uninterruptible operation;
FIG. 3 is a schematic diagram of an embodiment of a single-outlet switch room for protecting power during uninterruptible operation;
fig. 4 is a schematic diagram of power conservation during uninterrupted operation of the multi-path outgoing ring main unit in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for operating a cable-type power distribution network without power outage in an embodiment of the present disclosure, and as shown in the figure, the method for operating the cable-type power distribution network without power outage includes the following steps:
and 102, selecting a transformer without power failure as a power taking end transformer.
The cable type power distribution network is operated without power outage, and a transformer without power outage needs to be selected to get power and supply power for equipment needing power conservation. In actual operation, a transformer close to power-protection-end power equipment can be selected to quickly build a power-taking loop to carry out uninterrupted operation
And 104, laying a bypass cable between the power equipment at the power-on end and the power-taking end transformer.
Specifically, after the power taking end transformer is selected, a bypass cable needs to be laid between the power taking end transformer and the equipment needing power protection so as to carry out power connection, and the bypass cable comprises a traditional bypass flexible cable. In one embodiment, the bypass cable further comprises a bypass switch for independently controlling each bypass to realize independent control of each transformer so as to avoid full-line power failure when the transformer fails, and meanwhile, when live-line access operation is carried out, the situation that the safety of workers at the power supply end is influenced by directly conveying electric power from the power taking end to the power supply end can be avoided.
And step 106, connecting one end of the bypass cable to a power receiving point of the power protection end electric equipment, and connecting the other end of the bypass cable to a high-voltage side copper bar of the power taking end transformer to form a temporary power taking loop.
And respectively connecting the two ends of the laid bypass cable to a power receiving point of power equipment at a power protection end and a power taking point of a power taking end transformer to form a power taking loop. And the high-voltage side exposed copper bar of the power taking end transformer is selected as a power taking point.
The conventional technology generally holds that different from an overhead power distribution network, a cable power distribution network does not have accessibility when no switch cabinets such as a spare cabinet, a contact cabinet and a contact cabinet formed by power conversion are not put into operation, namely, uninterrupted operation cannot be carried out. However, although the cable body can not be accessed in the cable type power distribution network, the copper bars exposed on the high-voltage side of the distribution transformer in the cable type power distribution network have accessibility, so that the copper bars on the high-voltage side of the distribution transformer are used as power taking points to perform uninterrupted operation when accessible points such as a spare cabinet, a contact cabinet and a contact cabinet formed by power transfer are lacked, and the power supply reliability of a power grid is effectively improved. Furthermore, when the bypass cable is connected, the two ends of the bypass cable can be connected through the quick plug connector, and the bypass cable is connected in a live-line connection mode, so that the electricity consumption experience of an electricity-taking end electricity user is prevented from being influenced.
As shown in fig. 2, fig. 3 and fig. 4, when the distribution transformer high-voltage side copper bar is used as a power taking point to perform uninterrupted operation, the power protection end power equipment includes but is not limited to power equipment such as a transformer, a switch cabinet, a bypass ring main unit, a ring main unit vehicle, and the power protection mode is not limited to power protection of a single transformer, power protection of a single outgoing line and power protection of multiple outgoing lines.
Referring to fig. 2, in one embodiment, the power protection end electric device is a single transformer, the bypass cable includes a bypass switch, and the two end connectors of the bypass cable are quick-connect connectors. Under the premise of confirming the disconnection of the bypass switch, the joints at the two ends of the bypass cable are simultaneously electrified and connected into a high-voltage side copper bar of the power taking end transformer and a high-voltage side copper bar of the power protection end transformer to form a temporary power taking loop.
Referring to fig. 3, in an embodiment, the power protection end electric device is a switch room with one outgoing line, and the connectors at two ends of the bypass cable are quick plug connectors. The spare cabinet of the selective switch room is used as a power receiving point and is connected into one end of a bypass cable, and the other end of the bypass cable is connected into a high-voltage side copper bar of a power taking end transformer to form a temporary power taking loop.
Referring to fig. 4, in an embodiment, the power protection end electric device is a multi-path outgoing ring main unit vehicle, and the connectors at two ends of the bypass cable are quick plug connectors. One end of the bypass cable is connected to a high-voltage side copper bar of the power taking end transformer, and the other end of the bypass cable is connected to any power receiving point of the ring main unit vehicle according to actual requirements to form a temporary power taking loop.
And step 108, performing power supply transfer.
And closing related switches of the temporary power taking loop to form a path for power supply operation. Wherein the relevant switch can be a bypass switch on a bypass cable or a switch of a power equipment with a power protection end.
In one embodiment, before step 106, the method further comprises the steps of: respectively placing the joints at two ends of the laid bypass cable in suspended positions; performing insulation detection on the assembled temporary electricity taking loop; and fully discharging the temporary electricity taking loop by using an insulated discharge device. In this embodiment, through carrying out insulating nature detection and fully discharging to getting the electric circuit, can improve the security of the operation of not cutting off the power supply.
It can be understood that the cable type power distribution network is generally built in urban areas with dense loads, the loads are concentrated, the distribution transformers of the cable type power distribution network are densely distributed, but the cable type power distribution network is generally light in load, and therefore the cable type power distribution network can be used as a power taking end to carry out uninterrupted operation. However, if the load on the transformer at the power-taking end is too heavy, the problem of voltage fluctuation may be caused, and therefore, in an embodiment, step 102 includes: selecting a non-power-off transformer; detecting the size of a load on the uninterrupted transformer, and comparing the detected load with a set threshold value; and when the load on the uninterrupted transformer is detected to be lower than the set threshold value, taking the uninterrupted transformer as the power taking end transformer. This embodiment is through selecting the transformer that has suitable load size as getting the electric end transformer, effectively avoids the operation of not cutting off the power supply to cause getting the too big problem of electric end power line load, can improve the security and the reliability of the operation of not cutting off the power supply.
During the actual operation of the power grid, the stability of the power grid may fluctuate due to the change of the magnitude of the electrical load, so in an embodiment, step 108 is followed by the steps of: setting a certain sampling time interval; detecting the load of a temporary power taking loop which is performing power supply conversion according to the sampling time interval, and comparing the load with a set safety threshold; and when the load of the temporary power taking loop is detected to be larger than the safety threshold, stopping power supply. In this embodiment, the load on the temporary power-taking loop for performing the operation of converting power into power without power outage is monitored in real time, so that the load is not greater than a safety threshold, and the safety of the operation without power outage can be improved.
In one embodiment, step 108 is preceded by the step of: carrying out phase checking on the power taking end transformer and the power protection end electric equipment; and when detecting that the phases of the power taking end transformer and the power maintaining end electric equipment are different, disconnecting the bypass cable, fully discharging and adjusting the phases. When selecting distribution transformer high pressure side copper bar and regard as getting the electric point and carry out the operation of not cutting off the power supply, because the selected end transformer of getting is often located different transmission lines with the end power equipment of protecting the power, probably has the condition that the phase place is incorrect, consequently carries out the nuclear phase before carrying out the operation of not cutting off the power supply, can improve the security of the operation of not cutting off the power supply.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A non-power-outage operation method for a cable type power distribution network comprises the following steps:
selecting a transformer without power failure as a power taking end transformer;
laying a bypass cable between the power-saving end power equipment and the power-taking end transformer; the power protection end power equipment comprises one or more of a power protection end transformer, a switch cabinet, a bypass ring main unit and a ring main unit vehicle; the power protection mode comprises one or more of power protection of a single transformer, power protection of a single outgoing line and power protection of a plurality of outgoing lines;
connecting one end of the bypass cable to a power receiving point of the power protection end electric equipment, and connecting the other end of the bypass cable to a high-voltage side copper bar of the power taking end transformer to form a temporary power taking loop; the power receiving point of the power protection end transformer comprises a high-voltage side copper bar of the power protection end transformer;
performing power supply conversion;
wherein, the step of selecting the transformer that does not have a power failure as the power take-off end transformer includes:
selecting a non-power-off transformer;
detecting the size of the load on the uninterrupted transformer, and comparing the detected size with a set threshold value;
and when the load on the uninterrupted transformer is detected to be lower than the set threshold value, taking the uninterrupted transformer as the power taking end transformer.
2. The method according to claim 1, wherein in the step of forming the temporary power-taking loop by connecting one end of the bypass cable to a power-receiving point of the power-saving-end power equipment and connecting the other end of the bypass cable to a high-voltage-side copper bar of the power-taking-end transformer, the connection mode of the bypass cable comprises live connection.
3. The method of claim 2, wherein the two-end connector of the bypass cable comprises a quick-connect plug connector.
4. The method according to claim 1, wherein after the step of connecting one end of the bypass cable to a power receiving point of the power equipment at the power protection end and connecting the other end of the bypass cable to a high-voltage side copper bar of the power taking end transformer to form a temporary power taking loop, the method further comprises the following steps:
respectively placing connectors at two ends of the laid bypass cable at a suspension position;
performing insulation detection on the assembled temporary electricity taking loop;
and fully discharging the temporary electricity taking loop by using an insulated discharge device.
5. The method of claim 1, wherein the bypass cable further comprises a bypass switch.
6. The method according to claim 5, wherein the power-protection-end power equipment is a single transformer, and the two-end connectors of the bypass cable are simultaneously electrified and connected into the high-voltage-side copper bar of the power-taking-end transformer and the high-voltage-side copper bar of the power-protection-end transformer under the condition that the bypass switch is confirmed to be disconnected, so as to form a temporary power-taking loop.
7. The method of claim 1, wherein said step of transferring power further comprises the steps of:
setting a certain sampling time interval;
detecting the load of the temporary power taking loop which is performing power supply switching according to the sampling time interval, and comparing the load with a set safety threshold value;
and when the load of the temporary electricity taking loop is detected to be larger than the safety threshold, stopping power supply.
8. The method of claim 1, wherein said step of transferring power further comprises the steps of:
carrying out phase checking on the power taking end transformer and the power protection end power equipment;
and when detecting that the phases of the power taking end transformer and the power protection end electric equipment are different, disconnecting the bypass cable, and adjusting the phases after fully discharging.
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| CN112991089B (en) * | 2021-02-05 | 2022-06-10 | 国网福建省电力有限公司 | Method for optimizing distribution network uninterrupted operating point selection and equipment investment |
| CN113054656A (en) * | 2021-03-10 | 2021-06-29 | 广东电网有限责任公司广州供电局 | Distribution transformer overhauling method and device, electronic equipment and storage medium |
| CN113328374A (en) * | 2021-04-19 | 2021-08-31 | 国网浙江淳安县供电有限公司 | Earth potential all-terrain on-load operation method |
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