Transformer secondary gear regulation and control method

Abstract

The invention relates to the field of electrical engineering, in particular to a transformer secondary gear regulation and control method. Firstly, an electric control on-load tap-changer is installed on a transformer, voltage detection instruments are installed on the primary side and the secondary side, and the switch is adjusted to the highest level to record voltage data so as to calculate the number-of-turns variation. Then, a field signal receiving and transmitting device is arranged at an accessory of the transformer, related equipment is accessed, wireless connection with a remote control platform is established, and the ZigBee protocol is followed. And a current detection instrument is additionally arranged on the secondary side to transmit real-time current data. The current gear can be judged and the optimal adjustment strategy can be analyzed based on the primary side voltage and the secondary side voltage, and a worker can regulate and control and obtain information on a remote platform. The method has the advantages that remote accurate control and real-time monitoring are realized, the operation convenience and accuracy are improved, and the risk and cost of manual field operation are reduced.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering, and in particular to a transformer secondary gear control method. Background Art

[0002] In today's complex power system, transformers play a key role. Their main function is to effectively adjust the voltage to meet a variety of complex power needs. The traditional transformer gear adjustment method usually relies heavily on manual operation on site, which has many significant defects. On the one hand, its efficiency is extremely low, consuming a lot of manpower and time costs; on the other hand, due to the limitations of manual operation, it is difficult to monitor and adjust the gear in real time and accurately, resulting in the inability to adapt to the dynamic changes of voltage and load in the power system in a timely and sensitive manner.

[0003] With the rapid development and progress of modern power technology, the demand for intelligent control and remote monitoring of transformers has become increasingly urgent and strong. However, some existing transformer gear control methods have many thorny problems. For example, the signal transmission process is not stable enough and is easily interfered by various external factors, which greatly reduces the accuracy of the data and makes it impossible to achieve remote flexible control in a real sense. In addition, due to the lack of effective, reliable real-time monitoring methods and accurate gear adjustment strategies, the operating efficiency and stability of the transformer are difficult to be fully and fully guaranteed, which is likely to cause a significant decline in power quality, a substantial increase in equipment losses, and even a series of potential safety hazards, posing a serious threat to the safe and stable operation of the entire power system. Summary of the invention

[0004] In order to improve the operational reliability of the power system, optimize the power quality, and realize efficient and intelligent management of transformers, the present invention proposes the following technical solutions:

[0005] A transformer secondary gear control method, characterized in that it comprises the following steps:

[0006] S1: Install an electronically controlled on-load tap-changer on the transformer, install voltage detection instruments on the primary and secondary sides of the transformer, adjust the gear of the electronically controlled on-load tap-changer to the highest gear, record the voltage data of the primary and secondary sides of the transformer, and calculate the change in the number of turns of the electronically controlled on-load tap-changer gear. This step can accurately determine the change in the number of turns of the electronically controlled on-load tap-changer at different gears, and provide accurate data support for subsequent voltage regulation.

[0007] S2: Set up a signal transceiver on site near the transformer, connect the voltage detection instruments installed on the primary and secondary sides of the electric-controlled on-load tap-changer and the transformer to the signal transceiver on site, establish a remote control platform, and establish a remote wireless connection between the remote control platform and the signal transceiver. The establishment of the remote control platform can realize remote monitoring and control of the transformer, improving work efficiency and safety. At the same time, the wireless connection method can avoid the trouble of wiring and improve the flexibility and reliability of the system.

[0008] S3: Add a current detection instrument on the secondary side of the transformer and connect the current detection instrument to the on-site signal transceiver. The current detection instrument will detect the current data of the transformer secondary side in real time and transmit it wirelessly to the remote control platform through the on-site signal transceiver. Adding a current detection instrument can provide a more comprehensive understanding of the transformer's operating status, timely discover potential problems, and improve the reliability and stability of the system.

[0009] S4: Based on the voltage information on the primary and secondary sides of the transformer, the current gear position of the electrically controlled on-load tap changer is determined and the optimal gear adjustment strategy is analyzed. The principle is that by analyzing the voltage information on the primary and secondary sides of the transformer, the current gear position of the electrically controlled on-load tap changer can be determined, and the optimal gear adjustment strategy can be analyzed according to the load conditions and voltage requirements. The staff can understand the current gear position and adjustment strategy information of the switch on the remote control platform, and adjust the gear position based on this information. The on-load tap changer will record each gear adjustment data of the day. This step can achieve precise control of the electrically controlled on-load tap changer and improve the efficiency and accuracy of voltage regulation. At the same time, recording the gear adjustment data can provide a basis for system optimization and improvement.

[0010] S5: After the staff adjusts the on-load tap changer position through the remote control platform, the remote control platform will judge the on-load tap changer based on the transformer data. The remote control platform can judge whether the on-load tap changer is operating normally after adjusting the position by analyzing the voltage, current and other data of the transformer. If an abnormality is found, an alarm can be issued in time and corresponding measures can be taken. This step is used to timely detect faults and abnormalities of the on-load tap changer and improve the reliability and safety of the system.

[0011] Preferably, the electrically controlled on-load tap changer in S1 is electrically controlled by PLC programming and connected to a field signal transceiver. The PLC programming generates a control signal according to a preset control logic and algorithm to accurately drive the action of the electrically controlled on-load tap changer.

[0012] Preferably, in the above S1, when calculating the change in the number of turns ΔN of the electric-controlled on-load tap changer gear position, the relevant expression is as follows:

[0013]

[0014] Where U 1 Indicates the primary voltage value of the transformer, U 2 Indicates the transformer secondary voltage value, n indicates the number of gears of the electronically controlled on-load tap changer, N 2 Indicates the number of turns on the secondary side of the transformer.

[0015] Preferably, in S4, the remote control platform should include a remote signal transceiver, the remote signal transceiver is used to establish a wireless connection with an on-site signal transceiver, and the wireless connection between the signal transceiver and the on-site signal transceiver complies with the ZigBee protocol. The wireless connection that complies with the ZigBee protocol has the advantages of low power consumption, short distance, high reliability, and self-organizing network, and can ensure stable and efficient data transmission between the remote control platform and the on-site equipment.

[0016] Preferably, in S5, when judging the gear position m that the electric-controlled on-load tap changer is currently in, the relevant expression is as follows:

[0017]

[0018] Where N 2max Indicates the number of turns on the secondary side of the transformer when the tap changer is in the highest position, N 1 Indicates the number of turns on the primary side of the transformer, ΔN indicates the change in the number of turns of the on-load tap changer position, U 1 Indicates the transformer primary voltage, U 2 Indicates the primary voltage of the transformer.

[0019] Preferably, in S6, when analyzing the gear adjustment strategy, the relevant expression is as follows:

[0020]

[0021] Where n represents the number of gears that need to be adjusted, and if n is a positive number; N exp It indicates the theoretical primary side turns corresponding to the expected voltage, ΔN indicates the change in the number of turns of the electric on-load tap changer, U 1 Indicates the transformer primary voltage, U 2 Indicates the transformer secondary voltage, N 2 Indicates the current number of turns on the secondary side.

[0022] Preferably, the theoretical primary side turns N corresponding to the expected voltage is exp , the relevant expressions are as follows:

[0023]

[0024] Where U expIndicates the expected voltage on the secondary side of the preset compiler, U 1 Indicates the transformer primary voltage, N 2 Indicates the current number of turns on the secondary side.

[0025] Preferably, in S5, when performing abnormal analysis on the on-load tap changer, the relevant expression is as follows:

[0026]

[0027] Where I is the current value, T is the time it takes for the on-load tapchanger to complete the gear switching, N is the number of gear switching times of the on-load tapchanger in 1 day, and w 1 、w 2 、w 3 is the weight coefficient and w 1 、w 2 、w 3 The total is 1, I ref is the normal operating current value of the on-load tap changer itself at a specific gear, T ref N is the time it takes for the tap changer to complete the gear switching under normal circumstances, which is set based on experience. ref is the number of times the on-load tap changer switches gears in a normal day according to experience, and E is an indicator for evaluating the operating status of the on-load tap changer, where E is less than the threshold value E set according to experience. thresh When the on-load tapchanger is in normal operation, it is considered that there may be an abnormality.

[0028] The beneficial effects of the present invention are:

[0029] 1. The present invention realizes intelligent control of transformer gears, improves operating efficiency, and reduces the complexity and inefficiency of manual on-site operations.

[0030] 2. The present invention can accurately monitor the voltage on the primary and secondary sides of the transformer and the current on the secondary side in real time, providing accurate data support for gear adjustment.

[0031] 3. Through the remote control platform, the present invention allows the staff to remotely understand the operating status and adjustment strategy of the transformer, thus achieving flexible regulation.

[0032] 4. The detailed mathematical expression of the present invention provides an accurate calculation basis for the change in the number of turns, gear position judgment, adjustment strategy and gear adjustment operation judgment, thereby ensuring the accuracy and stability of the system.

[0033] 5. The present invention adopts ZigBee protocol for wireless connection, which ensures the stability and reliability of signal transmission.

[0034] 6. The on-load tap changer of the present invention records the number of gear adjustments, which is helpful for long-term tracking and analysis of the operation of the transformer.

[0035] 7. The effective gear adjustment strategy of the present invention can optimize the power quality, improve the operational reliability of the power system, reduce equipment losses, and reduce potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a schematic flow chart of a transformer secondary gear control method. DETAILED DESCRIPTION

[0037] A transformer secondary gear control method comprises the following steps:

[0038] S1: Install an electronically controlled on-load tap-changer on the transformer, install voltage detection instruments on the primary and secondary sides of the transformer, adjust the gear of the electronically controlled on-load tap-changer to the highest gear, record the voltage data of the primary and secondary sides of the transformer, and calculate the change in the number of turns of the electronically controlled on-load tap-changer gear; the electronically controlled on-load tap-changer is electrically controlled through PLC programming and connected to the on-site signal transceiver. When calculating the change in the number of turns ΔN of the electronically controlled on-load tap-changer gear, the relevant expression is as follows:

[0039]

[0040] Where U 1 Indicates the primary voltage value of the transformer, U 2 Indicates the transformer secondary voltage value, n indicates the number of gears of the electronically controlled on-load tap changer, N 2 Indicates the number of turns on the secondary side of the transformer.

[0041] S2: Set up an on-site signal transceiver near the transformer, connect the voltage detection instruments installed on the primary and secondary sides of the electric-controlled on-load tap-changer and the transformer to the on-site signal transceiver, and establish a remote control platform. The remote control platform should include a remote signal transceiver. The remote signal transceiver is used to establish a wireless connection with the on-site signal transceiver. The wireless connection between the signal transceiver and the on-site signal transceiver complies with the ZigBee protocol.

[0042] S3: Add a current detection instrument on the secondary side of the transformer, connect the current detection instrument to the on-site signal transceiver, and the current detection instrument will detect the secondary side current data of the transformer in real time, and transmit it wirelessly to the remote control platform through the on-site signal transceiver;

[0043] S4: Based on the primary and secondary voltage information of the transformer, the current gear position of the electronically controlled on-load tap changer is determined and the optimal gear adjustment strategy is analyzed. The staff can understand the current gear position and adjustment strategy information of the switch on the remote control platform, and adjust the gear position based on this information. The on-load tap changer will record each gear adjustment data of the day.

[0044] When judging the current position m of the electric on-load tap changer, the relevant expression is as follows:

[0045]

[0046] Where N 2max Indicates the number of turns on the secondary side of the transformer when the tap changer is in the highest position, N 1 Indicates the number of turns on the primary side of the transformer, ΔN indicates the change in the number of turns of the on-load tap changer position, U 1 Indicates the primary voltage of the transformer, U 2 Indicates the primary voltage of the transformer.

[0047] When analyzing the gear adjustment strategy, the relevant expressions are as follows:

[0048]

[0049] In the formula, n represents the number of gears that need to be adjusted. If n is a positive number, ΔN represents the change in the number of turns of the electric on-load tap changer gear. U 1 Indicates the primary voltage of the transformer, U 2 Indicates the transformer secondary voltage, N 2 Indicates the current number of turns on the secondary side. N exp Indicates the theoretical number of primary turns corresponding to the expected voltage. The relevant expression is as follows:

[0050]

[0051] Where U exp Indicates the expected voltage on the secondary side of the preset compiler, U 1 Indicates the transformer primary voltage, N 2 Indicates the current number of turns on the secondary side.

[0052] S5: After the staff adjusts the on-load tap changer position through the remote control platform, the remote control platform will operate the on-load tap changer according to the transformer data to determine whether the on-load tap changer is operating normally.

[0053] To determine whether an abnormality occurs after the on-load tap changer completes the staff's shifting operation, the relevant expression is as follows:

[0054]

[0055] Where I is the current value, T is the time it takes for the on-load tapchanger to complete the gear switching, N is the number of gear switching times of the on-load tapchanger in 1 day, and w 1 、w 2 、w 3 is the weight coefficient and w 1 、w 2 、w 3 The total is 1, I ref is the normal operating current value of the on-load tap changer itself at a specific gear, T ref N is the time it takes for the tap changer to complete the gear switching under normal circumstances, which is set based on experience. ref is the number of times the on-load tap changer switches gears in a normal day according to experience, and E is an indicator for evaluating the operating status of the on-load tap changer, where E is less than the threshold value E set according to experience. th resh When the on-load tapchanger is in normal operation, it is considered that there may be an abnormality.

Claims

1. A transformer secondary gear control method, characterized in that: The following steps are involved: S1: Install an electronically controlled on-load tap changer on the transformer, install voltage detection instruments on the primary and secondary sides of the transformer respectively, adjust the gear of the electronically controlled on-load tap changer to the highest gear, and record the voltage data of the primary and secondary sides of the transformer, and calculate the change in the number of turns of the electronically controlled on-load tap changer gear; S2: Set up a signal transceiver on site near the transformer, connect the voltage detection instruments installed on the primary and secondary sides of the electric-controlled on-load tap-changer and the transformer to the signal transceiver on site, establish a remote control platform, and establish a remote wireless connection between the remote control platform and the signal transceiver; S3: Add a current detection instrument on the secondary side of the transformer, connect the current detection instrument to the on-site signal transceiver, and the current detection instrument will detect the secondary side current data of the transformer in real time, and transmit it wirelessly to the remote control platform through the on-site signal transceiver; S4: Based on the transformer primary and secondary voltage information, the current gear position of the electronically controlled on-load tap changer is determined, and the optimal gear adjustment strategy is analyzed. The staff can understand the current gear position and adjustment strategy information of the switch on the remote control platform, and adjust the gear position based on this information. The on-load tap changer will record each gear adjustment data of the day; S5: After the staff adjusts the gear position of the on-load tap changer through the remote control platform, the remote control platform will perform an abnormal analysis on the on-load tap changer based on the transformer data to determine whether the on-load tap changer has any abnormality after the gear position adjustment is completed.

2. A transformer secondary gear control method according to claim 1, characterized in that: The electrically controlled on-load tap changer in S1 is electrically controlled through PLC programming and connected to a field signal transceiver.

3. A transformer secondary gear control method according to claim 1, characterized in that: In the above S1, when calculating the change in the number of turns ΔN of the electric-controlled on-load tap changer position, the relevant expression is as follows: In the formula, U1 represents the primary voltage of the transformer, U2 represents the secondary voltage of the transformer, n represents the number of gears of the electronically controlled on-load tap changer, and N2 represents the number of turns on the secondary side of the transformer.

4. A transformer secondary gear control method according to claim 1, characterized in that: In the S4, the remote control platform should be connected to a remote signal transceiver, and the remote signal transceiver is used to establish a wireless connection with an on-site signal transceiver. The wireless connection between the signal transceiver and the on-site signal transceiver complies with the ZigBee protocol.

5. A transformer secondary gear control method according to claim 1, characterized in that: In S5, when judging the current position m of the electric on-load tap changer, the relevant expression is as follows: Where N 2max It indicates the number of turns on the secondary side of the transformer when the tap changer is in the highest position, N1 indicates the number of turns on the primary side of the transformer, ΔN indicates the change in the number of turns of the on-load tap changer position, U1 indicates the primary voltage of the transformer, and U2 indicates the primary voltage of the transformer.

6. A transformer secondary gear control method according to claim 1, characterized in that: In S6, when analyzing the gear adjustment strategy, the relevant expressions are as follows: Where n represents the number of gears that need to be adjusted, and if n is a positive number; N exp It indicates the theoretical primary side turns corresponding to the expected voltage, ΔN indicates the change in the number of turns of the electronically controlled on-load tap changer, U1 indicates the primary side voltage of the transformer, U2 indicates the secondary side voltage of the transformer, and N2 indicates the current number of turns on the secondary side.

7. A transformer secondary gear control method according to claim 6, characterized in that: The theoretical primary side turns N corresponding to the expected voltage exp , the relevant expressions are as follows: Where U exp It represents the expected voltage on the secondary side of the preset compiler, U1 represents the voltage on the primary side of the transformer, and N2 represents the number of turns on the current secondary side.

8. A transformer secondary gear control method according to claim 6, characterized in that: In S5, when abnormal analysis is performed on the on-load tap changer, the relevant expressions are as follows: Where I is the current value, T is the time it takes for the on-load tap changer to complete the gear switching, N is the number of gear switching times of the on-load tap changer within 1 day, w1, w2, w3 are weight coefficients and the sum of w1, w2, w3 is 1, I ref is the normal operating current value of the on-load tap changer itself at a specific gear, T ref N is the time it takes for the tap changer to complete the gear switching under normal circumstances, which is set based on experience. ref is the number of times the on-load tap changer switches gears in a normal day according to experience, and E is an indicator for evaluating the operating status of the on-load tap changer, where E is less than the threshold value E set according to experience. thresh When the on-load tapchanger is in normal operation, it is considered that there may be an abnormality.

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