Method for accessing new expansion interval by non-power-off bus differential protection

Abstract

The application provides a method for connecting a newly expanded interval to a non-power mother difference protection, which comprises detecting the completion of the preparation work before the connection of the newly expanded interval, including the cable connection of the current loop of the newly expanded interval, the virtual loop of the protection device, the virtual loop of the intelligent terminal and the virtual loop of the switch blade, withdrawing all GOOSE loop outlet soft press plates and putting in the maintenance press plates and sealing the non-working terminals, and downloading the SCD configuration file and storing it on the 220kV mother difference protection device; after detecting that all the preparation work has been completed, connecting the current loop of the newly expanded interval on the 220kV mother difference protection device, and configuring the functions of all the virtual loops according to the SCD configuration file; performing abnormal verification on all the loops of the newly expanded interval, if there is no abnormality, putting in the 220kV mother difference protection, and further applying for the operation of the newly expanded interval. The application can avoid the connection risk by standardizing the connection mechanism of the newly expanded interval, and improves the safety of the power grid operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and particularly relates to a method for connecting new expansion interval to bus differential protection without power interruption. BACKGROUND

[0002] The intelligent technology and big data analysis technology are widely used in substation construction and operation and maintenance, which obviously improves the maintenance quality of the power system, improves the efficiency of defect analysis and judgment, realizes condition-based maintenance, and reduces the safety risk.

[0003] At present, the intelligent substation is integrated with intelligent technology and big data analysis technology on the basis of the traditional substation, and can realize remote operation, real-time monitoring and autonomous maintenance. With the explosive growth of power grid applications, the intelligent substation often needs to be expanded at intervals, but there is a lack of an effective mechanism to regulate the access of new expansion interval in the prior art, so that the intelligent substation often has great risks (such as incorrect sequence, incorrect configuration and data loss) in the process of accessing new expansion interval, especially for 220kV bus differential protection, which involves many intervals, and a slight negligence will cause power grid accidents.

[0004] Therefore, it is necessary to provide a method for connecting new expansion interval to bus differential protection without power interruption, which can avoid access risks by regulating the access mechanism of new expansion interval, and improve the safety of power grid operation. SUMMARY

[0005] The technical problem to be solved by the embodiments of the present application is to provide a method for connecting new expansion interval to bus differential protection without power interruption, which can avoid access risks by regulating the access mechanism of new expansion interval, and improve the safety of power grid operation.

[0006] In order to solve the above technical problems, the embodiments of the present application provide a method for connecting new expansion interval to bus differential protection without power interruption, which comprises the following steps:

[0007] S1, detecting completion of a preparation work item before a 220 kV bus differential protection is accessed to a newly expanded bay; wherein the preparation work item comprises a newly expanded bay circuit access, 220 kV bus differential protection exit and file preparation; the newly expanded bay circuit access item comprises connecting a current circuit, a virtual circuit at a protection device, a virtual circuit at an intelligent terminal and a virtual circuit at a switch contactor of the newly expanded bay through cable laying; the 220 kV bus differential protection exit item comprises exiting a GOOSE circuit exit soft pressboard in the 220 kV bus differential protection, inputting a maintenance pressboard of a protection device and an intelligent terminal of the newly expanded bay, and inputting a maintenance pressboard of the 220 kV bus differential protection device and sealing a non-working terminal in operation of the 220 kV bus differential protection device; the file preparation item comprises downloading SCD configuration files of the virtual circuit at the protection device, the virtual circuit at the intelligent terminal and the virtual circuit at the switch contactor of the newly expanded bay, and storing the SCD configuration files on the 220 kV bus differential protection device;

[0008] S2, after detecting that all the preparation work items are completed, accessing a current circuit of the newly expanded bay on the 220 kV bus differential protection device, and performing function configuration on a virtual circuit at a protection device, a virtual circuit at an intelligent terminal and a virtual circuit at a switch contactor of the newly expanded bay according to the stored SCD configuration files;

[0009] S3, performing abnormality verification on all the circuits accessed and configured by the 220 kV bus differential protection device, and when verifying that all the circuits are normal, inputting the 220 kV bus differential protection, and further applying the newly expanded bay to be put into operation; wherein the step of inputting the 220 kV bus differential protection comprises exiting a maintenance pressboard of a protection device and an intelligent terminal of the newly expanded bay, exiting a maintenance pressboard of the 220 kV bus differential protection device and unsealing a non-working terminal in operation of the 220 kV bus differential protection device, and inputting all GOOSE circuit exit soft pressboards in the 220 kV bus differential protection.

[0010] Wherein, between the step S2 and the step S3, the method further comprises the following steps:

[0011] checking whether a current circuit access position of the newly expanded bay is consistent with a bay definition in the 220 kV bus differential protection device, and if not, adjusting the current circuit access position of the newly expanded bay until consistency is achieved.

[0012] The virtual circuit of the protection device of the newly expanded interval includes a start failure open virtual circuit; the virtual circuit of the intelligent terminal of the newly expanded interval includes a switch position open virtual circuit; and the virtual circuit of the switch of the newly expanded interval includes a trip outlet open virtual circuit, a start failure open virtual circuit, a failure intertrip three-side open virtual circuit, a backup power automatic blocking open virtual circuit and a de-compression blocking open virtual circuit.

[0013] The GOOSE circuit outlet soft press plate includes an interval trip outlet soft press plate, a failure intertrip three-side outlet soft press plate, a backup power automatic blocking outlet soft press plate and a de-compression blocking outlet soft press plate; and the non-working terminal of the 220kV bus differential protection device in operation includes each interval current circuit terminal and each bus voltage circuit terminal connected to the 220kV bus differential protection device.

[0014] In the step S3, the abnormality verification content of the current circuit connected to the 220kV bus differential protection device includes polarity, transformation ratio, accuracy level, insulation check and primary and secondary current rise.

[0015] Before the step of inputting the 220kV bus differential protection, the following steps are further included:

[0016] The maintenance mechanism of the 220kV bus differential protection device and the protection device and the intelligent terminal of the newly expanded interval are subjected to abnormality verification;

[0017] If the maintenance press plates of the 220kV bus differential protection device and the protection device and the intelligent terminal of the newly expanded interval are normal in the same input or same output operation, no alarm is given; otherwise, an alarm is given.

[0018] Before the step of inputting the 220kV bus differential protection, the following steps are further included:

[0019] The protection device of the newly expanded interval is subjected to comprehensive state detection, including connection state, operation state, voltage and current sampling condition and interval open condition; wherein,

[0020] The connection state is determined by checking all the optical fiber connection states of the back plate of the protection device of the newly expanded interval;

[0021] The operation state is obtained by power-off restart and self-checking program when the connection state of the protection device of the newly expanded interval is determined to be normal;

[0022] The voltage and current sampling condition is obtained by checking whether the voltage sampling and current sampling of the protection device of the newly expanded interval are normal and whether the large difference and small difference current flows are normal;

[0023] The interval insertion case is determined by checking whether the new expansion interval insertion of the protection device of the new expansion interval is normal.

[0024] Before the step of inputting the 220kV bus differential protection, the following steps are further included:

[0025] The state detection of the 220kV bus differential protection device includes a fixed value execution state and an alarm state; wherein,

[0026] The fixed value execution state is determined by executing the newly issued fixed value after expansion and checking whether the fixed value is correct and the custom area number is correct;

[0027] The alarm state is determined by checking whether there is an abnormal alarm based on the load test of the new expansion interval.

[0028] The embodiment of the present application has the following beneficial effects:

[0029] The present application can achieve the purpose of avoiding the access risk by standardizing the access mechanism of the new expansion interval and improving the safety of power grid operation by standardizing the pre-preparation work, writing the SCD configuration file of each virtual loop in the current loop in the new expansion interval during the access, and performing abnormal verification on the current loop in the new expansion interval and all virtual loops after the access. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings obtained according to these drawings without creative labor are still within the scope of the present application.

[0031] Figure 1 A flowchart of a method for accessing a new expansion interval by non-power-off bus differential protection according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the present application in detail with reference to the drawings.

[0033] As shown in Figure 1 A method for accessing a new expansion interval by non-power-off bus differential protection according to an embodiment of the present application is provided, which includes the following steps:

[0034] Step S1, detecting completion of the preparation work items before the 220kV bus differential protection accesses the newly expanded bay; wherein the preparation work items include new expanded bay circuit access, 220kV bus differential protection exit and file preparation; the new expanded bay circuit access items include connecting the current loop, the protection device virtual loop, the intelligent terminal virtual loop and the switch virtual loop of the newly expanded bay by laying cables; the 220kV bus differential protection exit items include exiting the GOOSE loop exit soft press plate in the 220kV bus differential protection, inputting the maintenance press plate of the protection device and the intelligent terminal of the newly expanded bay, and inputting the maintenance press plate of the 220kV bus differential protection device and sealing the non-working terminal in the operation of the 220kV bus differential protection device; the file preparation items include downloading the SCD configuration files of the protection device virtual loop, the intelligent terminal virtual loop and the switch virtual loop of the newly expanded bay, and storing them on the 220kV bus differential protection device;

[0035] The specific process is that first, the preparation work items before access are arranged, including new expanded bay circuit access, 220kV bus differential protection exit (i.e. on-site safety measures are performed) and file preparation.

[0036] At this time, the new expanded bay circuit access items include but are not limited to connecting the current loop, the protection device virtual loop, the intelligent terminal virtual loop and the switch virtual loop of the newly expanded bay by laying cables. Among them, the protection device virtual loop of the newly expanded bay includes but is not limited to the start failure input virtual loop; the intelligent terminal virtual loop of the newly expanded bay includes but is not limited to the switch position input virtual loop; the switch virtual loop of the newly expanded bay includes but is not limited to the tripping exit input virtual loop, the start failure input virtual loop, the failure tripping three-side input virtual loop, the blocking backup automatic switching input virtual loop and the disengaging pressure blocking input virtual loop and other related virtual loops.

[0037] It should be noted that the work content of the new expanded bay circuit access also includes connecting the voltage loop and other secondary circuits in the newly expanded bay by laying cables.

[0038] At this time, the 220kV bus differential protection exit items include but are not limited to exiting the GOOSE loop exit soft press plate in the 220kV bus differential protection, inputting the maintenance press plate of the protection device and the intelligent terminal of the newly expanded bay, and inputting the maintenance press plate of the 220kV bus differential protection device and sealing the non-working terminal in the operation of the 220kV bus differential protection device. Among them, the GOOSE loop exit soft press plate includes but is not limited to the bay tripping exit soft press plate, the failure tripping three-side exit soft press plate, the blocking backup automatic switching exit soft press plate and the disengaging pressure blocking exit soft press plate; the non-working terminal in the operation of the 220kV bus differential protection device includes but is not limited to the current loop terminal and the bus voltage loop terminal of each bay connected to the 220kV bus differential protection device.

[0039] At this time, the file preparation includes downloading the SCD configuration file of the virtual circuit of the protection device, the virtual circuit of the intelligent terminal and the virtual circuit of the switch breaker of the newly expanded interval, and storing to the 220kV bus differential protection device. It should be noted that the downloaded SCD configuration file needs to correspond to the virtual circuit configured in the matter of connecting the new expanded interval, and before downloading, the original SCD configuration file should be backed up on the 220kV bus differential protection device.

[0040] Secondly, the completion of the above preparation matters is detected.

[0041] Step S2, after detecting that all the preparation matters have been completed, connecting the current circuit of the newly expanded interval to the 220kV bus differential protection device, and configuring the function of the virtual circuit of the protection device, the virtual circuit of the intelligent terminal and the virtual circuit of the switch breaker of the newly expanded interval according to the stored SCD configuration file.

[0042] The specific process is that first, after all the preparation matters have been completed, the current circuit of the newly expanded interval is connected to the 220kV bus differential protection device.

[0043] It should be noted that before step S3 is performed, the connection position should be checked to be consistent with the interval definition in the 220kV bus differential protection device, if not, the connection position of the current circuit of the newly expanded interval is adjusted until it is consistent. Further, the current circuit connected to the 220kV bus differential protection device needs to be checked and accepted comprehensively, including polarity, variable ratio, accuracy level, insulation inspection and primary and secondary surge.

[0044] Secondly, check all the virtual circuits of the protection device, the intelligent terminal and the switch breaker of the newly expanded interval corresponding to the downloaded SCD configuration file, and configure the function according to the above downloaded SCD configuration file.

[0045] It should be noted that the function of the virtual circuit of the protection device, the virtual circuit of the intelligent terminal and the virtual circuit of the switch breaker of the newly expanded interval needs to be comprehensively accepted after configuration, to ensure that all the virtual circuit functions of the newly expanded interval are correct. For example, the acceptance content includes: 220kV side switch breaker position input, starting failure input, release of pressure closing input and failure linkage jump three side function, and the starting failure input virtual circuit function of the protection device, the switch position input virtual circuit function of the intelligent terminal, etc.

[0046] Step S3, all circuits connected to and configured for the 220kV bus differential protection device are verified for abnormality, and when it is verified that all circuits have no abnormality, the 220kV bus differential protection is put into operation, and further application of the newly expanded interval is put into operation; wherein the step of putting the 220kV bus differential protection into operation specifically comprises: withdrawing the maintenance press plate of the protection device and the intelligent terminal of the newly expanded interval, withdrawing the maintenance press plate of the 220kV bus differential protection device and releasing the non-working terminal of the 220kV bus differential protection device in the sealed operation, and putting all GOOSE circuit outlet soft press plates in the 220kV bus differential protection into operation.

[0047] The specific process is that, first, before putting the 220kV bus differential protection into operation, in addition to the comprehensive verification and acceptance of the current circuit connected to the 220kV bus differential protection device in step S2, and the comprehensive acceptance of the function of the virtual circuit after the configuration of the protection device of the newly expanded interval, the intelligent terminal and the switch knife, the maintenance mechanism of the newly expanded interval needs to be verified.

[0048] Therefore, before executing the step of putting the 220kV bus differential protection into operation, the following step is also included: the maintenance mechanism of the 220kV bus differential protection device and the protection device and the intelligent terminal of the newly expanded interval is also verified for abnormality; wherein if the maintenance press plates of the 220kV bus differential protection device and the protection device and the intelligent terminal of the newly expanded interval are normally operated in the same operation or withdrawal, no alarm is given; otherwise, an alarm is given.

[0049] Further, the state of the device before putting the 220kV bus differential protection into operation also needs to be checked. Therefore, before executing the step of putting the 220kV bus differential protection into operation, the following step is also included: the protection device of the newly expanded interval is comprehensively state detected, including the connection state, the running state, the voltage and current sampling situation and the interval opening situation; wherein the connection state is determined by checking all the optical fiber connection states of the back plate of the protection device of the newly expanded interval; the running state is obtained by restarting and self-checking program after determining that the connection state of the protection device of the newly expanded interval is normal; the voltage and current sampling situation is obtained by checking whether the voltage sampling and current sampling of the protection device of the newly expanded interval are normal, and whether the large difference and small difference current is normal; the interval opening situation is obtained by checking whether the newly expanded interval opening of the protection device of the newly expanded interval is normal.

[0050] It can be understood that the state of the device of other intervals except the newly expanded interval also needs to be checked, and the contents of the check are the same as those of the protection device of the newly expanded interval, which will not be described one by one here.

[0051] Further, it is also required to check the device state before the 220kV bus differential device is put into operation. Therefore, before the step of putting the 220kV bus differential protection into operation, the following step is further included: performing state detection on the 220kV bus differential protection device, including fixed value execution state and alarm state; wherein the fixed value execution state is obtained by executing the newly issued fixed value after expansion, and checking whether the fixed value is correct and whether the customization area number is correct; the alarm state is obtained by checking whether there is an abnormal alarm based on the load test of the newly expanded interval. It can be understood that the device state check before the 220kV bus differential device is put into operation should not be limited to the newly expanded interval, but can also be extended to the existing interval, which will not be described here.

[0052] Secondly, when it is verified that all the loops are normal, the 220kV bus differential protection is put into operation, i.e. the on-site recovery safety measures are executed.

[0053] The step of putting the 220kV bus differential protection into operation specifically includes: withdrawing the maintenance press plate of the protection device and the intelligent terminal of the newly expanded interval, withdrawing the maintenance press plate of the 220kV bus differential protection device and releasing the non-working terminal of the 220kV bus differential protection device which is sealed in operation, and putting the GOOSE (including the existing interval and the newly expanded interval) loop outlet soft press plate of the 220kV bus differential protection into operation.

[0054] Finally, the newly expanded interval is applied for operation.

[0055] The embodiment of the present application has the following beneficial effects:

[0056] The present application can avoid the risk of connection and improve the safety of power grid operation by standardizing the connection mechanism of the newly expanded interval through the following steps: standardizing the preparation work in advance, connecting the current loop in the newly expanded interval and writing the SCD configuration file of each virtual loop, verifying the current loop in the newly expanded interval and all virtual loops for abnormalities, and putting into operation if all the verifications are normal.

[0057] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc.

[0058] The above disclosure is only the preferred embodiment of the present application, and of course cannot limit the scope of the right of the present application, therefore, the equivalent changes made according to the claims of the present application still fall within the scope of the present application.

Claims

1. A method for accessing a newly expanded bay by a non-power failure bus differential protection, characterized in that, The method comprises the following steps: S1, detecting completion of a preparation work item before a 220 kV bus differential protection is accessed to a newly expanded bay; wherein the preparation work item comprises a newly expanded bay circuit access, 220 kV bus differential protection exit and file preparation; the newly expanded bay circuit access item comprises connecting a current circuit, a protection device virtual circuit, a smart terminal virtual circuit and a switch virtual circuit of the newly expanded bay through cable laying; the 220 kV bus differential protection exit item comprises exiting a GOOSE circuit exit soft pad in the 220 kV bus differential protection, inputting a maintenance pad of a protection device and a smart terminal of the newly expanded bay, and inputting a maintenance pad of the 220 kV bus differential protection device and sealing a non-working terminal in operation of the 220 kV bus differential protection device; the file preparation item comprises downloading SCD configuration files of the protection device virtual circuit, the smart terminal virtual circuit and the switch virtual circuit of the newly expanded bay, and storing the SCD configuration files on the 220 kV bus differential protection device; S2, after detecting that all the preparation work items have been completed, accessing a current circuit of the newly expanded bay on the 220 kV bus differential protection device, and performing function configuration on the protection device virtual circuit, the smart terminal virtual circuit and the switch virtual circuit of the newly expanded bay according to the stored SCD configuration files; S3, performing abnormality verification on all the circuits accessed and configured by the 220 kV bus differential protection device, and when it is verified that all the circuits have no abnormality, inputting the 220 kV bus differential protection, and further applying the newly expanded bay to run; wherein the step of inputting the 220 kV bus differential protection comprises exiting the maintenance pad of the protection device and the smart terminal of the newly expanded bay, exiting the maintenance pad of the 220 kV bus differential protection device and unsealing the non-working terminal in operation of the 220 kV bus differential protection device, and inputting all the GOOSE circuit exit soft pads in the 220 kV bus differential protection.

2. The method for accessing a newly expanded bay by the non-power-failure bus differential protection of claim 1, wherein, Between the step S2 and the step S3, the method further comprises the following step: Checking whether a current circuit access position of the newly expanded bay is consistent with a bay definition in the 220 kV bus differential protection device, and if not, adjusting the current circuit access position of the newly expanded bay until consistency is achieved.

3. The method for accessing a new expansion bay by the non-power-failure bus differential protection of claim 2, wherein, The protection device virtual circuit of the newly expanded bay comprises a start failure input virtual circuit; the smart terminal virtual circuit of the newly expanded bay comprises a switch position input virtual circuit; and the switch virtual circuit of the newly expanded bay comprises a tripping exit input virtual circuit, a start failure input virtual circuit, a failure tripping three-side input virtual circuit, a blocking backup automatic throw-in input virtual circuit and a release pressure blocking input virtual circuit.

4. The method for accessing a new expansion bay by the non-power-failure bus differential protection of claim 3, wherein, The GOOSE loop outlet soft platen comprises interval trip outlet soft platen, failure link trip three-side outlet soft platen, blocking spare power input outlet soft platen and release complex blocking outlet soft platen; the non-working terminal in operation of the 220kV bus differential protection device comprises interval current loop terminal and bus voltage loop terminal connected to the 220kV bus differential protection device.

5. The method for accessing a new expansion bay by the non-power mother difference protection of claim 4, wherein, In the step S3, the abnormal verification content in the current loop connected to the 220kV bus differential protection device comprises polarity, variable ratio, accuracy level, insulation check and primary and secondary surge.

6. The method for accessing a new expansion bay by the non-power mother difference protection of claim 5, wherein, Before the step of inputting the 220kV bus differential protection, the following step is further included: The maintenance mechanism of the 220kV bus differential protection device and the protection device and intelligent terminal of the newly expanded interval is subjected to abnormal verification; If the maintenance platen of the 220kV bus differential protection device and the maintenance platen of the protection device and intelligent terminal of the newly expanded interval are normally operated in the same input or same output condition, no alarm is given; otherwise, an alarm is given.

7. The method for accessing a new expansion bay by the non-power-failure bus differential protection of claim 6, wherein, Before the step of inputting the 220kV bus differential protection, the following step is further included: The protection device of the newly expanded interval is subjected to comprehensive state detection, including connection state, operation state, voltage and current sampling condition and interval input condition; wherein, The connection state is determined by checking all optical fiber connection conditions of the back plate of the protection device of the newly expanded interval; The operation state is obtained by power-off restart and self-checking program when the connection state of the protection device of the newly expanded interval is determined to be normal; The voltage and current sampling condition is obtained by checking whether the voltage sampling and current sampling of the protection device of the newly expanded interval are normal, and whether the large difference and small difference current is normal; The interval input condition is obtained by checking whether the newly expanded interval input of the protection device of the newly expanded interval is normal.

8. The method for accessing a new expansion bay by the non-power-failure bus differential protection of claim 7, wherein, Before the step of inputting the 220kV bus differential protection, the following step is further included: The state of the 220kV bus differential protection device is detected, including setting value execution state and alarm state; wherein, The setting value execution state is obtained by executing the newly issued setting value after expansion, checking whether the setting value is correct and whether the custom area number is correct; The alarm state is obtained by checking whether there is abnormal alarm based on the load test of the newly expanded interval.

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