A transitional method for integrated automation upgrade of 110kV substations

Abstract

This invention discloses a transition method for the integrated automation upgrade of a 110kV substation, comprising: de-energizing the first main transformer and the first 110kV line; connecting the first main transformer and the first 110kV line to a transition compartment and resuming service of the first main transformer and the first 110kV line; de-energizing the second main transformer and the second 110kV line; performing replacement installation and commissioning of the substation's secondary equipment, and then resuming service of the second main transformer and the second 110kV line; de-energizing the first main transformer and the first 110kV line, disconnecting the connection between the first main transformer and the first 110kV line and the transition compartment, connecting the first main transformer and the first 110kV line to the updated secondary equipment of the substation and commissioning; testing the upgraded substation, and removing the transition compartment after confirming that the test meets the standards. By using a transition compartment to replace the original substation secondary equipment and alternately de-energizing the main transformer and its lines, the reliable operation of the power grid is ensured during the substation upgrade process.

Description

Technical Field

[0001] This invention relates to the field of power distribution and transformation, and in particular to a transitional method for the integrated automation upgrade of a 110kV substation. Background Technology

[0002] In the past decade or so, the pace of power grid construction has accelerated, and the number of substations, as crucial nodes in power grid transmission, has doubled in just a few years. Secondary equipment within substations is a vital guarantee for the safe operation of primary equipment and the power grid system, with an operating cycle generally around twelve years. According to relevant regulations, protection and safety automatic devices that have reached or exceeded their prescribed service life must be prioritized for upgrading. Secondary equipment older than twelve years needs to be replaced based on its operating cycle. Incomplete statistics show that protection equipment exceeding its service life frequently experiences device malfunctions and communication failures, leading to forced shutdowns; power board damage to protection and control devices is common; and manufacturers often lack spare parts after equipment upgrades, all of which are detrimental to the safe and stable operation of the power grid.

[0003] Existing substation automation upgrades employ two implementation schemes: First, where power outages are feasible, all primary and secondary equipment is shut down during the upgrade period, with only the secondary equipment being upgraded. Second, spare switchboards are installed in the secondary equipment room, and the equipment is upgraded in stages, with half of the equipment shut down first, followed by the other half. However, many substations currently lack spare switchboards in their secondary equipment rooms; furthermore, the distribution network is not operating in a daisy-chain configuration. A complete shutdown would not only result in power loss but also cause adverse social impacts. Therefore, existing upgrade schemes cannot meet the upgrade requirements. Summary of the Invention

[0004] The present invention aims to overcome the problem that existing substation automation upgrades affect the continuous and safe operation of substations, and provides an effective transition method for 110kV substation integrated automation upgrades that ensures reliable power grid operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a transitional method for integrated automation upgrade of a 110kV substation, wherein the substation includes a first main transformer, a second main transformer, a first 110kV line, a second 110kV line, and secondary equipment, comprising:

[0006] Step S1: Collect equipment information of the 110kV substation and design the layout of the transition compartment;

[0007] Based on the collected equipment information, the equipment layout and cable arrangement of the transition compartment are planned.

[0008] Step S2: Install the transition compartment and lay cables according to the plan for the transition compartment;

[0009] Step S3: While keeping the power on, connect the remote communication device of the transfer cabin to the communication channel of the main station, and install and debug the back-end machine;

[0010] Step S4: De-energize the first main transformer and the first 110kV line; connect the first main transformer and the first 110kV line to the transition compartment, and restore the first main transformer and the first 110kV line to service.

[0011] Step S5: De-energize the second main transformer and the second 110kV line; replace and debug the secondary equipment of the substation, and then restore the second main transformer and the second 110kV line to service;

[0012] Step S6: De-energize the first main transformer and the first 110kV line, disconnect the connection between the first main transformer and the first 110kV line and the transition compartment, and connect and debug the first main transformer and the first 110kV line to the upgraded secondary equipment of the substation.

[0013] Step S7: Test the upgraded substation and remove the transition compartment after confirming that the test meets the standards. By using the transition compartment to replace the original substation secondary equipment, the main transformer and its lines of the substation are alternately de-energized, thereby ensuring the reliable operation of the power grid during the substation upgrade process.

[0014] Preferably, the substation equipment information mentioned in step S1 includes: the specifications and quantity of the main transformer, the specifications and quantity of the high-voltage lines, and the specifications and quantity of all secondary equipment.

[0015] Preferably, the equipment in the transition compartment includes a remote communication cabinet, a main transformer protection cabinet, a main transformer measurement and control cabinet, a line measurement and control cabinet, and a terminal conversion cabinet.

[0016] Furthermore, the remote communication cabinet includes a data communication gateway, a station control layer central switch, a protocol converter, a monitoring host, a display, and a panel cabinet; the main transformer protection cabinet includes a main transformer protection device, a non-electrical quantity protection device, a printer, and a panel cabinet; the main transformer measurement and control cabinet includes a main transformer measurement and control unit and a panel cabinet; the line measurement and control cabinet includes a line measurement and control device, an operating box, and a panel cabinet; and the terminal conversion cabinet includes terminal block accessories and a panel cabinet.

[0017] Preferably, the replacement of the secondary equipment in the substation described in step S5 includes: replacing the first main transformer protection equipment, replacing the second main transformer protection equipment, replacing the 110kV internal bridge automatic transfer device, replacing the 110kV fault disconnection device, replacing the 110kV fault recorder, and replacing the control cables of the secondary equipment.

[0018] Preferably, the replacement of the substation's secondary equipment in step S5 includes: removing the original monitoring system equipment and installing a monitoring system that adopts the DL / T860 standard.

[0019] Preferably, the first and second main transformer protection devices replaced in step S5 both include: gas protection: installed on the main transformer body and on-load switch, which sends a signal after light gas action and trips the circuit breakers and bridge circuit breakers on both sides of the corresponding main transformer instantly after heavy gas action.

[0020] Longitudinal differential protection: including ratio differential protection with second harmonic ratio braking and differential instantaneous overcurrent protection, which instantaneously trips the circuit breakers on both sides of the main transformer and the bridge circuit breaker after operation;

[0021] Main transformer release valve protection: It has two positions: trip and signal. The trip is connected to the corresponding main transformer output circuit.

[0022] Grounding protection includes zero-sequence overcurrent protection and zero-sequence no-current blocking voltage protection. After the grounding protection operates, the corresponding circuit breakers on both sides of the main transformer and the bridge circuit breaker will trip.

[0023] Preferably, the neutral point of the zero-sequence overcurrent protection is directly grounded, and the neutral point of the zero-sequence no-current blocking voltage protection is not grounded or is grounded through a gap.

[0024] Preferably, the DL / T860 standard monitoring system is used to acquire analog signals, switching signals, and interlocking signals from the substation. These signals are then analyzed and calculated by reactive power and voltage control software to regulate the opening and closing of capacitor banks and on-load tap changers on the main transformer. This achieves local reactive power balance and ensures the qualification rate of the low-voltage bus voltage.

[0025] Therefore, the present invention has the following beneficial effects: by using a transition compartment to replace the original substation secondary equipment, the main transformer and its lines of the substation are alternately de-energized, thereby ensuring the reliable operation of the power grid during the substation renovation process. Attached Figure Description

[0026] Figure 1 This is a flowchart of a transitional method for integrated automation upgrade of a 110kV substation according to an embodiment of the present invention. Detailed Implementation

[0027] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0028] Example:

[0029] like Figure 1 The method for transitioning to integrated automation upgrades in a 110kV substation is shown below: The substation includes a first main transformer, a second main transformer, a first 110kV line, a second 110kV line, and secondary equipment, including:

[0030] Step S1: Collect equipment information from the 110kV substation and design the layout of the transition compartment; plan the equipment and cable layout of the transition compartment based on the collected equipment information; the substation equipment information includes: the specifications and quantity of the main transformer, the specifications and quantity of high-voltage lines, and the specifications and quantity of all secondary equipment. The remote communication cabinet includes a data communication gateway, a station control layer central switch, a protocol converter, a monitoring host, a display, and a control panel; the main transformer protection cabinet includes main transformer protection devices, non-electrical quantity protection devices, a printer, and a control panel; the main transformer measurement and control cabinet includes main transformer measurement and control and a control panel; the line measurement and control cabinet includes line measurement and control devices, an operating box, and a control panel; the terminal block adapter cabinet includes terminal block accessories and a control panel.

[0031] Step S2: Install the transition compartment and lay cables according to the plan for the transition compartment;

[0032] Step S3: While keeping the power on, connect the remote communication device of the transfer cabin to the communication channel of the main station, and install and debug the back-end machine;

[0033] Step S4: De-energize the first main transformer and the first 110kV line; connect the first main transformer and the first 110kV line to the transition compartment, and restore the first main transformer and the first 110kV line to service.

[0034] Step S5: De-energize the second main transformer and the second 110kV line; replace and debug the secondary equipment of the substation, and then restore the second main transformer and the second 110kV line to service;

[0035] The replacement of old secondary equipment in the substation includes: replacing the protection equipment of the first main transformer, replacing the protection equipment of the second main transformer, replacing the 110kV internal bridge automatic transfer switch, replacing the 110kV fault disconnection device, replacing the 110kV fault recorder, and replacing the control cables of the secondary equipment. The existing monitoring system equipment is removed and replaced with a DL / T860 standard monitoring system. The DL / T860 standard monitoring system acquires analog signals, switch signals, and interlocking signals from the substation, analyzes and calculates them using reactive power and voltage control software, and regulates the opening and closing of capacitor banks and on-load tap changers of the main transformers. This achieves local reactive power balance and ensures the qualification rate of the low-voltage bus voltage.

[0036] The replaced first and second main transformer protection devices both include: gas protection: installed on the main transformer body and on-load switch, sending a signal after light gas action, and instantly tripping the circuit breakers and bridge circuit breakers on both sides of the corresponding main transformer after heavy gas action.

[0037] Longitudinal differential protection: including ratio differential protection with second harmonic ratio braking and differential instantaneous overcurrent protection, which instantaneously trips the circuit breakers on both sides of the main transformer and the bridge circuit breaker after operation;

[0038] Main transformer release valve protection: It has two positions: trip and signal. The trip is connected to the corresponding main transformer output circuit.

[0039] Grounding protection includes zero-sequence overcurrent protection and zero-sequence no-current blocking voltage protection. After the grounding protection operates, the corresponding circuit breakers on both sides of the main transformer and the bridge circuit breaker will trip. The neutral point of the zero-sequence overcurrent protection is directly grounded, and the neutral point of the zero-sequence no-current blocking voltage protection is either ungrounded or grounded through a gap.

[0040] Step S6: Disconnect the first main transformer and the first 110kV line from the transition compartment, and connect and debug the first main transformer and the first 110kV line to the upgraded secondary equipment of the substation.

[0041] Step S7: Test the upgraded substation and remove the transition compartment after confirming that the test meets the standards. By using the transition compartment to replace the original substation secondary equipment, the main transformer and its lines of the substation are alternately de-energized, thereby ensuring the reliable operation of the power grid during the substation upgrade process.

[0042] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0043] Although this document uses terms such as transition compartment, back-end equipment, substation, main transformer, and secondary equipment extensively, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A 110 kV substation integrated automation renovation transition method, the substation comprising a first main transformer, a second main transformer, a first 110 kV line, a second 110 kV line and secondary equipment, characterized in that, include: Step S1: Collect equipment information of the 110kV substation and design the layout of the transition compartment; Based on the collected equipment information, the equipment layout and cable arrangement of the transition compartment will be planned. The equipment in the transition compartment includes a remote communication cabinet, a main transformer protection cabinet, a main transformer measurement and control cabinet, a line measurement and control cabinet, and a terminal conversion cabinet. Step S2: Install the transition compartment and lay cables according to the transition compartment plan; Step S3: While keeping the power on, connect the remote communication device of the transfer cabin to the communication channel of the main station, and install and debug the back-end machine; Step S4: De-energize the first main transformer and the first 110kV line; connect the first main transformer and the first 110kV line to the transition compartment, and reactivate the first main transformer and the first 110kV line. Step S5: De-energize the second main transformer and the second 110kV line; replace and debug the secondary equipment of the substation, and then restore the second main transformer and the second 110kV line to service; The replacement of the secondary equipment in the substation includes: replacing the first main transformer protection equipment, replacing the second main transformer protection equipment, replacing the 110kV internal bridge automatic transfer device, and replacing the control cables of the secondary equipment. Step S6: Disconnect the first main transformer and the first 110kV line from the transition compartment, and connect and debug the first main transformer and the first 110kV line to the upgraded secondary equipment of the substation. Step S7: Test the modified substation and remove the transition compartment after confirming that the test meets the standards.

2. The 110 kV substation integrated automation renovation transition method according to claim 1, characterized in that, The substation equipment information mentioned in step S1 includes: the specifications and quantity of the main transformer, the specifications and quantity of the high-voltage lines, and the specifications and quantity of all secondary equipment.

3. The 110 kV substation integrated automation retrofit transition method of claim 2, wherein, The remote communication cabinet includes a data communication gateway, a station control layer central switch, a protocol converter, a monitoring host, a display, and a panel cabinet; the main transformer protection cabinet includes a main transformer protection device, a non-electrical quantity protection device, a printer, and a panel cabinet; the main transformer measurement and control cabinet includes a main transformer measurement and control unit and a panel cabinet; the line measurement and control cabinet includes a line measurement and control device, an operating box, and a panel cabinet; and the terminal conversion cabinet includes terminal block accessories and a panel cabinet.

4. The 110 kV substation integrated automation retrofit transition method of claim 3, wherein, The replacement of old and new secondary equipment in the substation described in step S5 also includes: replacing the 110kV fault disconnection device and replacing the 110kV fault recorder.

5. The 110 kV substation integrated automation retrofit transition method of claim 4, wherein, The replacement of the substation's secondary equipment in step S5 includes: removing the original monitoring system equipment and installing a monitoring system that adopts the DL / T860 standard.

6. The 110 kV substation integrated automation retrofit transition method of claim 5, wherein, The first and second main transformer protection devices replaced in step S5 both include: gas protection: installed on the main transformer body and on-load switch, sending a signal after light gas action, and instantly tripping the circuit breakers and bridge circuit breakers on both sides of the corresponding main transformer after heavy gas action. Longitudinal differential protection: including ratio differential protection with second harmonic ratio braking and differential instantaneous overcurrent protection, which instantaneously trips the circuit breakers on both sides of the main transformer and the bridge circuit breaker after operation; Main transformer release valve protection: It has two positions: trip and signal. The trip is connected to the corresponding main transformer output circuit. Grounding protection: includes zero-sequence overcurrent protection and zero-sequence no-current blocking voltage protection. After the grounding protection operates, the corresponding circuit breakers on both sides of the main transformer and the bridge circuit breaker will trip.

7. The 110 kV substation integrated automation retrofit transition method of claim 6, wherein, The neutral point of the zero-sequence overcurrent protection is directly grounded, while the neutral point of the zero-sequence no-current blocking voltage protection is either ungrounded or grounded via a gap.

8. A 110 kV substation integrated automation retrofit transition method according to claim 5, 6 or 7, characterized in that, The DL / T860 standard monitoring system is used to acquire analog signals, switching signals, and interlocking signals from the substation. These signals are then analyzed and calculated by reactive power and voltage control software to control the opening and closing of capacitor banks and on-load switches of the main transformer.

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