A mobile temporary overcurrent protection device and method

Abstract

A mobile temporary overcurrent protection device and method belong to the technical field of relay protection for electric power systems. In the present invention, aviation plugs are used to connect the mobile temporary overcurrent protection device and the analog and switch circuits of the electric power system, changing the traditional transformation and replacement working mode of the protection equipment. The plug-and-play connection method of the aviation plug can realize rapid replacement without power outage, thereby reducing the workload of maintenance or transformation and replacement of substation protection equipment, and achieving the purpose of rapid detection or transformation and replacement of the protection device. Secondly, the device can adapt to the situation where the rated value of the secondary protection current transformer is 1A or 5A, and is not limited by the rated value of the secondary current transformer of the system, so it is suitable for temporary replacement of all low-voltage protection devices mainly for overcurrent protection.

Description

Technical Field

[0001] The invention belongs to the technical field of relay protection of electric power systems, and in particular relates to a mobile temporary overcurrent protection device and method. Background Art

[0002] Protection devices are the core guarantee for the safe and stable operation of power grids. Improper protection is one of the major safety risks in power grid operation. The old equipment in the power grid that has exceeded its service life can no longer fully meet the newly compiled relevant standards and specifications, let alone meet the more advanced application requirements of substations. The conventional treatment methods have the following main disadvantages:

[0003] 1. It is necessary to perform power outage operation on the primary equipment interval corresponding to the fault protection device, which is time-consuming and labor-intensive, and has low work efficiency;

[0004] 2. It is necessary to shut down the primary equipment interval corresponding to the fault protection device. If the power supply area is powered by a single power source, the power users in the power supply area must face the risk of power outage, and the power supply company will also face liability for breach of contract;

[0005] 3. It is necessary to shut down the primary equipment interval corresponding to the fault protection device. If it is the interconnection line interval of the substation in the power grid system, the operation mode of the power grid is weak and the risk of safe operation of the power grid is increased.

[0006] With the urgent need to build a strong smart grid and safe, efficient, green and harmonious power supply, the application of the technology of replacing protection devices without power outage will fundamentally solve the prominent problems of long power outages due to large workload, complex safety measures and long verification process, which affect the safety and economy of power grid operation. Therefore, the present invention discloses a mobile temporary overcurrent protection device and method. Summary of the invention

[0007] The technical problem to be solved by the present invention is: to provide a mobile temporary overcurrent protection device and method to temporarily realize the basic protection function of the primary operating equipment corresponding to the fault protection device, so as to solve the technical problem that the prior art requires power outage for the primary equipment interval corresponding to the fault protection device for maintenance.

[0008] A mobile temporary overcurrent protection device comprises a housing, a line protection device and an extension device, wherein the line protection device and the extension device are installed inside the housing, and corresponding control keys, indicator lights and interfaces of the line protection device and the extension device are respectively arranged on the housing;

[0009] The expansion device includes a power switch, a current input aviation socket J1, a switch output aviation socket J2 and an external power interface; the external power interface is plugged into an external power source, and the three-phase connector of the external power interface is electrically connected to the pins L+, L-, and NC of the power plug X5 of the line protection device respectively; the power switch is electrically connected to the live wire path of the external power interface; the current input aviation socket J1 is connected to the analog circuit in the power system by an aviation plug, and the six pins 1 to 6 of the current input aviation socket J1 correspond to the six pins 1 to 6 of the AC plug X1 in sequence; the switch output aviation socket J2 is connected to the switch circuit in the power system by an aviation plug, and the ten pins 1 to 10 of the switch output aviation socket J2 correspond to the pins 1, 2, 5, 6, 9, 10, 13 and 14 of the switch plug X3 and the pins 1 and 2 of the power plug X5 in sequence; the PE pin of the power plug X5 is connected to the device grounding column.

[0010] A mobile temporary overcurrent protection method, using a mobile temporary overcurrent protection device, includes the following steps, and the following steps are performed in sequence:

[0011] Step 1: Connect the mobile temporary overcurrent protection device to the power supply, and set the rated value of the secondary protection current transformer to 1A or 5A according to the rated current of the secondary side of the power system;

[0012] Step 2: The three-phase protection current of the power system is short-circuited at the secondary terminal block using connecting pieces to prevent the secondary current transformer from being open-circuited;

[0013] Step 3: Connect the wiring terminal of the current aviation plug terminal of the power system to the three-phase current loop corresponding to the terminal block, and connect the wiring terminal of the output aviation plug terminal of the power system to the output loop corresponding to the terminal block;

[0014] Step 4: disconnect the current loop and the outlet loop of the problematic protection device in the original power system to prevent the power system from malfunctioning during the modification and replacement of the problematic device;

[0015] Step 5: Connect the current aviation plug terminal of the power system to the current input aviation socket J1 of a mobile temporary overcurrent protection device, and connect the output aviation plug terminal of the power system to the switch output aviation socket J2 of a mobile temporary overcurrent protection device;

[0016] Step 6: Open the short-circuited connector of the three-phase protection current of the power system at the secondary terminal block, so that the mobile temporary overcurrent protection device can protect the line in this interval;

[0017] Step 7: Replace and debug the problematic protection device plug-in or the entire device;

[0018] Step 8: Short-circuit the three-phase protection current of the power system at the secondary terminal block again;

[0019] Step 9: disconnect the current input aviation socket J1 and the switch output aviation socket J2 of a mobile temporary overcurrent protection device, disconnect the current aviation plug terminal plug of the power system from the terminal block, and disconnect the output aviation plug terminal plug of the power system from the terminal block;

[0020] Step 10: The current terminal and the outlet terminal of the replaced protection device are respectively connected to the corresponding three-phase current loop terminal and the outlet loop terminal of the terminal block;

[0021] Step 11. Open the short-circuited connector of the three-phase protection current of the power system at the secondary terminal block to realize the protection function of the replaced protection device on the interval line. The replacement of the protection device is completed.

[0022] In the step 3, both the current aviation plug terminal plug and the output aviation plug terminal plug are connected to the corresponding terminal block in a plug-in manner using a test line plug.

[0023] In the step 5, the current input aviation socket J1 is directly plugged and connected with the current aviation plug terminal plug.

[0024] In the step 5, the switch output aviation socket J2 is directly plugged and connected with the output aviation plug terminal plug.

[0025] The replacement and debugging of the problematic protection device plug-in or the entire device in step seven includes replacing a damaged plug-in, replacing the entire device, debugging the protection function of the modified device, and completing the set value setting.

[0026] Through the above design scheme, the present invention can bring the following beneficial effects:

[0027] In the present invention, aviation plugs are used to connect the mobile temporary overcurrent protection device and the analog and switch circuits of the power system, changing the traditional transformation and replacement working mode of the protection equipment. The plug-and-play connection method of the aviation plug can realize rapid replacement without power outage, thereby reducing the workload of maintenance or transformation and replacement of the substation protection equipment and achieving the purpose of rapid detection or transformation and replacement of the protection device.

[0028] Secondly, the device can adapt to the situation where the secondary protection current transformer rating is 1A or 5A, and is not limited by the system secondary current transformer rating, so it is suitable for temporary replacement of all low-voltage protection devices mainly for overcurrent protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0030] Figure 1 The present invention is a structural schematic diagram of a mobile temporary overcurrent protection device and method.

[0031] Figure 2 The present invention is a schematic diagram of the internal circuit connection of a mobile temporary overcurrent protection device and method of the present invention.

[0032] Figure 3 The present invention is a circuit connection diagram of a mobile temporary overcurrent protection device and method for current input aviation socket J1.

[0033] Figure 4 The present invention is a circuit connection diagram of a mobile temporary overcurrent protection device and method for a switch output aviation socket J2.

[0034] Figure 5 The present invention is a flow chart of a mobile temporary overcurrent protection device and method.

[0035] In the figure, 1-housing, 2-line protection device, 3-expansion device, 301-power switch, 302-current input aviation socket J1, 303-switch output aviation socket J2, 304-external power interface. DETAILED DESCRIPTION

[0036] As shown in the figure, a mobile temporary overcurrent protection device comprises a housing 1, a line protection device 2 and an extension device 3. The line protection device 2 and the extension device 3 are installed inside the housing 1, and corresponding control keys, indicator lights and interfaces of the line protection device 2 and the extension device 3 are respectively arranged on the housing 1;

[0037] The expansion device 3 includes a power switch 301, a current input aviation socket J1302, a switch output aviation socket J2303 and an external power interface 304; the external power interface 304 is plugged into an external power source, and the three-phase connector of the external power interface 304 is electrically connected to the pins L+, L-, and NC of the power plug X5 of the line protection device 2 respectively; the power switch 301 is electrically connected to the live wire path of the external power interface 304; the current input aviation socket J1302 is connected to the analog circuit in the power system using an aviation plug The six pins 1 to 6 of the current input aviation socket J1302 correspond to the six pins 1 to 6 of the AC plug X1 in sequence; the switch output aviation socket J2303 is connected to the switch circuit in the power system using an aviation plug, and the ten pins 1 to 10 of the switch output aviation socket J2303 correspond to the pins 1, 2, 5, 6, 9, 10, 13 and 14 of the switch plug X3 and the pins 1 and 2 of the power plug X5 in sequence; the PE pin of the power plug X5 is connected to the device grounding column.

[0038] A mobile temporary overcurrent protection method, using a mobile temporary overcurrent protection device, includes the following steps, and the following steps are performed in sequence:

[0039] Step 1: Connect the mobile temporary overcurrent protection device to the power supply, and set the rated value of the secondary protection current transformer to 1A or 5A according to the rated current of the secondary side of the power system;

[0040] Step 2: The three-phase protection current of the power system is short-circuited at the secondary terminal block using connecting pieces to prevent the secondary current transformer from being open-circuited;

[0041] Step 3: Connect the wiring terminal of the current aviation plug terminal of the power system to the three-phase current loop corresponding to the terminal block, and connect the wiring terminal of the output aviation plug terminal of the power system to the output loop corresponding to the terminal block;

[0042] Step 4: disconnect the current loop and the outlet loop of the problematic protection device in the original power system to prevent the power system from malfunctioning during the modification and replacement of the problematic device;

[0043] Step 5: Connect the current aviation plug terminal of the power system to the current input aviation socket J1302 of a mobile temporary overcurrent protection device, and connect the output aviation plug terminal of the power system to the switch output aviation socket J2303 of a mobile temporary overcurrent protection device;

[0044] Step 6: Open the short-circuited connector of the three-phase protection current of the power system at the secondary terminal block, so that the mobile temporary overcurrent protection device can protect the line in this interval;

[0045] Step 7: Replace and debug the problematic protection device plug-in or the entire device;

[0046] Step 8: Short-circuit the three-phase protection current of the power system at the secondary terminal block again;

[0047] Step 9, disconnect the current input aviation socket J1302 and the switch output aviation socket J2303 of a mobile temporary overcurrent protection device, disconnect the current aviation plug terminal plug of the power system from the terminal block, and disconnect the output aviation plug terminal plug of the power system from the terminal block;

[0048] Step 10: The current terminal and the outlet terminal of the replaced protection device are respectively connected to the corresponding three-phase current loop terminal and the outlet loop terminal of the terminal block;

[0049] Step 11. Open the short-circuited connector of the three-phase protection current of the power system at the secondary terminal block to realize the protection function of the replaced protection device on the interval line. The replacement of the protection device is completed.

[0050] In the step 1, the system secondary side rated current setting parameter constant "CT rated current IN" is 1A or 5A. According to the setting of the parameter constant, the device automatically adjusts the external protection current to a precise working range of 0.04I N ~20I N .

[0051] In the step 3, both the current aviation plug terminal plug and the output aviation plug terminal plug are connected to the corresponding terminal block in a plug-in manner using a test line plug.

[0052] In the step 5, the current input aviation socket J1302 is directly plugged and connected with the current aviation plug terminal plug.

[0053] In the step 5, the switch output aviation socket J2303 is directly plugged and connected with the output aviation plug terminal plug.

[0054] The replacement and debugging of the problematic protection device plug-in or the entire device in step seven includes replacing a damaged plug-in, replacing the entire device, debugging the protection function of the modified device, and completing the set value setting.

[0055] The present invention can quickly realize the transformation and replacement or detection and processing of batch protection devices, realize the updating and upgrading of protection devices through batch transformation and replacement, and quickly find devices with abnormal functions through batch detection. The present invention can ensure that the primary equipment can replace the protection device without power outage, change the traditional transformation and replacement working mode, and realize the replacement without power outage. First, it can greatly reduce the power outage time of users; secondly, it can avoid the problem of over-tripping caused by damage to the protection device, and fundamentally solve the problem of power outage; finally, it can reduce the workload of primary equipment switching operation caused by secondary equipment transformation.

Claims

1. A mobile temporary overcurrent protection method, using a mobile temporary overcurrent protection device, the mobile temporary overcurrent protection device comprising a housing (1), a line protection device (2) and an expansion device (3), the housing (1) being provided with the line protection device (2) and the expansion device (3), the housing (1) being provided with corresponding control keys, indicator lights and interfaces of the line protection device (2) and the expansion device (3), respectively; the expansion device (3) comprising a power switch (301), a current input aviation socket J1 (302), a switch output aviation socket J2 (303) and an external power interface (304); the external power interface (304) being plugged into an external power source, the three-phase connector of the external power interface (304) being connected to the pins L+, L- , NC are electrically connected; the power switch (301) is electrically connected to the live wire path of the external power interface (304); the current input aviation socket J1 (302) is connected to the analog circuit in the power system by an aviation plug, and the six pins 1 to 6 of the current input aviation socket J1 (302) are connected to the six pins 1 to 6 of the AC plug X1 in sequence; the switch output aviation socket J2 (303) is connected to the switch circuit in the power system by an aviation plug, and the ten pins 1 to 10 of the switch output aviation socket J2 (303) are connected to the 1st, 2nd, 5th, 6th, 9th, 10th, 13th and 14th pins of the switch plug X3 and the 1st and 2nd pins of the power plug X5 in sequence; the PE pin of the power plug X5 is connected to the device grounding column; it is characterized in that: The method comprises the following steps, and the following steps are performed in sequence: Step 1: Connect the mobile temporary overcurrent protection device to the power supply, and set the rated value of the secondary protection current transformer to 1A or 5A according to the rated current of the secondary side of the power system; Step 2: The three-phase protection current of the power system is short-circuited at the secondary terminal block using connecting pieces to prevent the secondary current transformer from being open-circuited; Step 3: Connect the wiring terminal of the current aviation plug terminal of the power system to the three-phase current loop corresponding to the terminal block, and connect the wiring terminal of the output aviation plug terminal of the power system to the output loop corresponding to the terminal block; Step 4: disconnect the current loop and the outlet loop of the problematic protection device in the original power system to prevent the power system from malfunctioning during the modification and replacement of the problematic device; Step 5: Connect the current aviation plug terminal plug of the power system to the current input aviation socket J1 (302) of a mobile temporary overcurrent protection device, and connect the output aviation plug terminal plug of the power system to the switch output aviation socket J2 (303) of a mobile temporary overcurrent protection device; Step 6: Open the short-circuited connector of the three-phase protection current of the power system at the secondary terminal block, so that the mobile temporary overcurrent protection device can protect the line in this interval; Step 7: Replace and debug the problematic protection device plug-in or the entire device; Step 8: Short-circuit the three-phase protection current of the power system at the secondary terminal block again; Step 9, disconnect the current input aviation socket J1 (302) and the switch output aviation socket J2 (303) of a mobile temporary overcurrent protection device, disconnect the current aviation plug terminal plug of the power system from the terminal block, and disconnect the output aviation plug terminal plug of the power system from the terminal block; Step 10: The current terminal and the outlet terminal of the replaced protection device are respectively connected to the corresponding three-phase current loop terminal and the outlet loop terminal of the terminal block; Step 11. Open the short-circuited connector of the three-phase protection current of the power system at the secondary terminal block to realize the protection function of the replaced protection device on the interval line. The replacement of the protection device is completed.

2. A mobile temporary overcurrent protection method according to claim 1, characterized in that: In the step 3, both the current aviation plug terminal plug and the output aviation plug terminal plug are connected to the corresponding terminal block in a plug-in manner using a test line plug.

3. A mobile temporary overcurrent protection method according to claim 1, characterized in that: In step 5, the current input aviation socket J1 (302) is directly plugged into the current aviation plug terminal plug.

4. A mobile temporary overcurrent protection method according to claim 1, characterized in that: In step 5, the switch output aviation socket J2 (303) is directly plugged and connected with the output aviation plug terminal plug.

5. A mobile temporary overcurrent protection method according to claim 1, characterized in that: The replacement and debugging of the problematic protection device plug-in or the entire device in step seven includes replacing a damaged plug-in, replacing the entire device, debugging the protection function of the modified device, and completing the set value setting.

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