Optimization method for live replacement of double-configuration secondary equipment

Abstract

The invention provides an optimization method for live replacement of double-configuration secondary equipment, and the method comprises the steps: enabling a new screen position to install a new main secondary protection device, and completing the cable laying and single debugging; when the old primary protection device retreats, the secondary circuit and the screen cabinet are dismounted in a live-line mode, a new primary protection device is installed at an original screen position, and cable laying and monomer debugging are completed; carrying out primary power failure on all intervals connected with the old primary protection device I and the old primary protection device II, and after all loops of the new primary protection device I and a tripping and closing outlet loop of the primary protection device II are connected, carrying out a switch transmission test to ensure that the tripping and closing outlet loops of the primary protection device I and the primary protection device II are correct; applying for commissioning after checking that the primary protection device is abnormal; and when the old main second protection device withdraws operation, the secondary circuit and the screen cabinet are dismounted in a live-line manner, and after all circuits of the new main second protection device are connected, operation is applied after no abnormity is detected. According to the invention, the problems that the switch cannot be directly driven and the tripping and closing outlet loop cannot be checked during the replacement of the main second protection in the conventional non-power-off replacement at present can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power maintenance, and in particular to an optimization method for live replacement of a dual-configuration secondary device. Background Art

[0002] In order to ensure the stable operation of the power system, the secondary equipment in the substations with voltage levels of 220kV and above generally adopts the principle of dual configuration to avoid the failure of a single set of protection devices (such as busbar differential protection devices, stabilization devices and standby automatic switching devices, etc.) to cause failure to operate and cause large-scale power outages in the power grid. In principle, the dual configuration protection devices should select two sets of equipment from different manufacturers to avoid the "family defects" of equipment from the same manufacturer posing hidden dangers to the safety of the power grid. According to the relevant technical specifications of the industry, the service life of the protection device is 12 years. Once the service life exceeds 12 years, it is urgently needed to be replaced. The main reason is to prevent the equipment from malfunctioning or refusing to operate due to aging and damage of key components.

[0003] For the protection devices with duplicate configuration, it is necessary to carry out transmission test on each interval switch after replacement to ensure that the above-mentioned devices can reliably operate to open and close the switches. Therefore, when replacing the secondary equipment with duplicate configuration, it is necessary to shut down the connected interval. Therefore, in order to reduce the frequency of power outages, a method of replacement without power outage has been invented.

[0004] However, the existing method of replacing secondary equipment without power outage is affected by the actual situation that power can only be cut off once. When replacing the second set of protection devices (generally the main and second protection devices), it is impossible to cut off the power and directly perform switch transmission, so that the output circuit of the second set of protection devices cannot be directly verified, resulting in the hidden danger of incorrect operation of the second set of protection devices.

[0005] Therefore, it is necessary to propose an optimization method for live replacement of dual-configuration secondary equipment, which can not only solve the problems of frequent power outages in the traditional replacement method resulting in heavy operating workload, difficulty in adjusting the grid mode, high grid risk during rotation outages, and long transformation cycle, but also solve the problems of the current conventional non-stop replacement method where the main and secondary protection cannot be directly driven, directly checked, or the output circuit cannot be closed when replacing. Summary of the invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide an optimization method for live replacement of dual-configuration secondary equipment, which can not only solve the problems of frequent power outages leading to large operating workload, difficulty in adjusting the power grid mode, large power grid risks during rotation outages, and long transformation cycles in the traditional method of replacing each set one by one, but also solve the problems of the second set of replaced equipment in the current conventional method of non-stop power supply being unable to directly transmit switches, directly check trips, and close output circuits.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides an optimization method for live replacement of a dual-configuration secondary device, the method comprising the following steps:

[0008] Before applying for the return of the old two sets of protection devices, the new screen position is used to install the new main and second protection devices, and the relevant cables of the new main and second protection devices are laid in place, and the single unit commissioning of the new main and second protection devices is further completed;

[0009] Apply for the return of the old main protection device, and after dismantling the secondary circuit and panel cabinet related to the old main protection device under power, install the new main protection device at the original panel position, lay the related cables of the new main protection device in place, and further complete the single unit commissioning of the new main protection device;

[0010] Determine all the intervals to which the old main protection device 1 is connected simultaneously with the old main protection device 2 before it is returned, and perform a power outage operation on each of the determined intervals. After all the circuits of the new main protection device 1 and the tripping and closing output circuits of the new main protection device 2 are correctly connected, perform switch transmission tests on the new main protection device 1 and the new main protection device 2 respectively to ensure that the tripping and closing output circuits of the new main protection device 1 and the new main protection device 2 are correct;

[0011] If the new main protection device is detected to be normal, then apply for the new main protection device to be put into operation;

[0012] Apply for the return of the old main second protection device, and after the secondary circuits and panel cabinets related to the old main second protection device are dismantled under power, connect all other secondary circuits except the tripping and closing exit circuit under power in the new main second protection device, and after all the circuits of the new main second protection device are connected, if it is detected that there is no abnormality in the new main second protection device, apply for the new main second protection device to be put into operation.

[0013] Among them, the abnormal detection of the new main protection device 1 and the new main protection device 2 is determined by detecting the voltage and current sampling conditions of the device, the set value execution conditions of the device, whether the device has an alarm, the opening conditions of each interval, and the load test conditions.

[0014] Among them, the protection device includes a dual-configuration stabilization and control device, a mother differential protection device and a backup automatic switching device.

[0015] Implementing the embodiments of the present invention has the following beneficial effects:

[0016] The present invention installs new main and second protection devices at different screen positions before the old equipment is returned and performs preparations such as single-body debugging before access. After the old main and first protection devices are returned, they are dismantled without power outage and the new main and first protection devices are installed at the original screen. Afterwards, all circuits of the new main and first protection devices are connected in conjunction with a round of power outages, and the tripping and closing exit circuits of the new main and second protection devices are connected to complete the most critical switch transmission verification. After the new main and first protection devices are put into operation, the old main and second protection devices are dismantled without power outages and all the remaining circuits of the new main and second protection devices are connected to complete the replacement of the two sets of equipment. This can solve the problems of frequent power outages leading to large operating workload, great difficulty in adjusting the power grid mode, great power grid risk during rotation outages, and long transformation cycle in the traditional method of replacing each set one by one, and can also solve the problems of being unable to directly transmit switches, directly verify tripping, and closing exit circuits when replacing the main and second protections in the current conventional method of replacing without power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0018] Figure 1 A flow chart of an optimization method for live replacement of a dual-configuration secondary device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown in the figure, an optimization method for live replacement of a dual configuration secondary device is proposed in an embodiment of the present invention, and the method comprises the following steps:

[0021] Step S1: before applying for return of the two old protection devices, a new screen is used to install the new main and second protection devices, and the related cables of the new main and second protection devices are laid in place, and the single unit debugging of the new main and second protection devices is further completed;

[0022] Step S2, apply for the return of the old main protection device, and after the secondary circuit and panel cabinet related to the old main protection device are removed under power, install the new main protection device at the original panel position, and lay the related cables of the new main protection device in place, and further complete the single unit commissioning of the new main protection device;

[0023] Step S3, determine all the intervals to which the old main first protection device is connected simultaneously with the old main second protection device before it is returned, and perform a power outage operation on each of the determined intervals, and after all the circuits of the new main first protection device and the tripping and closing output circuits of the new main second protection device are correctly connected, perform switch transmission tests on the new main first protection device and the new main second protection device respectively to ensure that the tripping and closing output circuits of the new main first protection device and the new main second protection device are correct;

[0024] Step S4: If it is detected that there is no abnormality in the new main protection device, apply for the new main protection device to be put into operation;

[0025] Step S5, apply for the return of the old main two protection devices, and after the secondary circuits and panels related to the old main two protection devices are removed under power, all other secondary circuits except the tripping and closing exit circuit are connected under power in the new main two protection devices, and after all the circuits of the new main two protection devices are connected, if it is detected that there is no abnormality in the new main two protection devices, apply for the new main two protection devices to be put into operation.

[0026] The specific process is that in step S1, in order to better ensure that the equipment in the station is under the protection of the duplicated protection device, before any changes are made to the original duplicated protection device (i.e. the old main one and main two protection devices), new main two protection devices are installed at different screen positions, and cable laying and single unit debugging of the new main two protection devices and other preparatory work before access are carried out.

[0027] Among them, the above-mentioned protection devices include but are not limited to a dual-configuration stabilization device, a mother differential protection device and a backup automatic transfer device.

[0028] In step S2, first, apply for the return of the old main protection device, and dismantle all its secondary circuits and cabinets without power outage; secondly, install the new main protection device at the original position, and carry out preparatory work before connection, such as cable laying and single unit debugging of the new main protection device.

[0029] That is, when it is detected that the old main protection device is applied for return, the secondary circuit and panel cabinet to which the old main protection device is connected are dismantled under power. After it is determined that the dismantling work is completed, the new main protection device is installed at the original panel position of the old main protection device, and the cable laying and single unit debugging of the new main protection device and other preparatory work before connection are carried out.

[0030] In step S3, first, all the intervals to which the old main one protection device was connected simultaneously with the old main two protection device before it was retired are determined, and a power outage operation is performed on each of the determined intervals; secondly, in conjunction with this power outage, all the circuits of the new main one protection device are connected, and the tripping and closing output circuits of the new main two protection devices are connected; then, in conjunction with this power outage, the two new protection devices (i.e., the new main one and main two protection devices) are respectively subjected to switch transmission tests to ensure that the tripping and closing output circuits connected to the new main one and main two protection devices are correct.

[0031] It should be noted that all the secondary circuits of each interval connected to the new main protection device should be improved in conjunction with the power outage. When the rotation outage of all connected intervals is completed and the public circuits such as signals need to be improved, the new main protection device will complete the access of all circuits.

[0032] At this time, combined with this power outage, the new main protection device should complete the transmission test of each interval switch to verify the correctness of the exit circuit. At the same time, combined with this power outage, the new main protection device should also complete the transmission test of each interval switch to verify the correctness of the exit circuit. It can be seen that the switch transmission test of the new main protection device can be completed in one power outage.

[0033] In step S4, based on the completion of the relevant circuit access and switch transmission test of the new main protection device in step S3, the new main protection device is tested for abnormality. If there is no abnormality, the new main protection device is applied to be put into operation. At this time, the detection items of the new main protection device at least include the voltage and current sampling of the device, the fixed value execution of the device, the alarm of the device, the opening of each interval, and the load test. That is, whether the new main protection device is abnormal is determined by the above detection items.

[0034] In step S5, since the new main first protection device has been put into operation, an application can be made to return the old main second protection device.

[0035] At this time, first, after the old main second protection device is applied for return, the secondary circuit and panel cabinet connected to the old main second protection device are dismantled under power, and without power outages, the other secondary circuits of the new main second protection device except the tripping and closing exit circuit are connected.

[0036] It should be noted that, although there is no power outage at this time, the new main and second protection devices have completed the connection of the tripping and closing output circuits of each interval switch during the previous power outage, and completed the switch output transmission verification, which has proved that the tripping and closing circuits are functioning normally. Therefore, only the old main and second protection device circuit needs to be dismantled here, and the tripping and closing output circuits of the new main and second protection devices do not need to be verified again.

[0037] Secondly, after all the circuits of the new main and secondary protection devices are connected, if it is detected that there is no abnormality in the new main and secondary protection devices, apply for the new main and secondary protection devices to be put into operation.

[0038] It should be noted that the detection items of the new main second protection device are the same as those of the new main first protection device in step S4. Please refer to the above content for details, and no further description will be given here.

[0039] Implementing the embodiments of the present invention has the following beneficial effects:

[0040] The present invention installs new main and second protection devices at different screen positions before the old equipment is returned and performs preparations such as single-body debugging before access. After the old main and first protection devices are returned, they are dismantled without power outage and the new main and first protection devices are installed at the original screen. Afterwards, all circuits of the new main and first protection devices are connected in conjunction with a round of power outages, and the tripping and closing exit circuits of the new main and second protection devices are connected to complete the most critical switch transmission verification. After the new main and first protection devices are put into operation, the old main and second protection devices are dismantled without power outages and all the remaining circuits of the new main and second protection devices are connected to complete the replacement of the two sets of equipment. This can solve the problems of frequent power outages leading to large operating workload, great difficulty in adjusting the power grid mode, great power grid risk during rotation outages, and long transformation cycle in the traditional method of replacing each set one by one, and can also solve the problems of being unable to directly transmit switches, directly verify tripping, and closing exit circuits when replacing the main and second protections in the current conventional method of replacing without power outages.

[0041] A person skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, CD-ROM, etc.

[0042] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An optimization method for live replacement of dual configuration secondary equipment, characterized in that: The method comprises the following steps: Before applying for the return of the old two sets of protection devices, the new screen position is used to install the new main and second protection devices, and the relevant cables of the new main and second protection devices are laid in place, and the single unit commissioning of the new main and second protection devices is further completed; Apply for the return of the old main protection device, and after dismantling the secondary circuit and panel cabinet related to the old main protection device under power, install the new main protection device at the original panel position, lay the related cables of the new main protection device in place, and further complete the single unit commissioning of the new main protection device; Determine all the intervals to which the old main protection device 1 is connected simultaneously with the old main protection device 2 before it is returned, and perform a power outage operation on each of the determined intervals. After all the circuits of the new main protection device 1 and the tripping and closing output circuits of the new main protection device 2 are correctly connected, perform switch transmission tests on the new main protection device 1 and the new main protection device 2 respectively to ensure that the tripping and closing output circuits of the new main protection device 1 and the new main protection device 2 are correct; If the new main protection device is detected to be normal, then apply for the new main protection device to be put into operation; Apply for the return of the old main second protection device, and after the secondary circuits and panel cabinets related to the old main second protection device are dismantled under power, connect all other secondary circuits except the tripping and closing exit circuit under power in the new main second protection device, and after all the circuits of the new main second protection device are connected, if it is detected that there is no abnormality in the new main second protection device, apply for the new main second protection device to be put into operation.

2. The optimization method for live replacement of dual configuration secondary equipment according to claim 1, characterized in that: The abnormal detection of the new main protection device 1 and the new main protection device 2 is determined by detecting the voltage and current sampling conditions of the device, the set value execution conditions of the device, whether the device has an alarm, the opening conditions of each interval, and the load test conditions.

3. The optimization method for live replacement of dual configuration secondary equipment according to claim 2, characterized in that: The protection device comprises a dual-configuration stabilization control device, a bus differential protection device and a standby automatic switching device.

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