A mountain box-type transformer control system

Abstract

The present invention relates to a mountain box-type transformer control system, comprising: a control module and n transformers; the control module is connected to the first transformer through a first optical fiber, the i-th transformer is connected to the i+1-th transformer through an i+1-th optical fiber, and the control module is connected to the n-th transformer through an n+1-th optical fiber (i=1, ..., n-1); a time t is provided in the control module for obtaining status information of the transformer, and controlling the opening or closing of switches on the high-voltage side and the low-voltage side of the n transformers in sequence at intervals of time t.

Description

Technical Field

[0001] The invention relates to a mountain box-type transformer control system, belonging to the field of transformer control. Background Art

[0002] At present, when the staff performs the power outage operation of the transformers in the whole field, they need to perform the power outage operation on each transformer in turn, and sometimes they need to arrange special personnel to check the equipment status on site. However, the equipment of mountain wind farms is relatively scattered, and it takes a long time to complete the power outage operation of the box-type transformers in the whole field under this method. If the whole field is out of power due to a fault on the grid side, it is impossible to restore the operation of all the equipment in the field in time.

[0003] Therefore, a control system that can automatically control the start and stop of the transformer is needed. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a mountain box-type transformer control system.

[0005] The technical solution of the present invention is as follows:

[0006] A mountain box-type transformer control system, comprising: a control module and n transformers;

[0007] The control module is connected to the first transformer through the first optical fiber, the i-th transformer is connected to the i+1-th transformer through the i+1-th optical fiber, and the control module is connected to the n-th transformer through the n+1-th optical fiber (i=1, ..., n-1);

[0008] The control module is provided with a timer t for acquiring status information of the transformer and sequentially controlling the opening or closing of switches on the high-voltage side and the low-voltage side of the n transformers at intervals of t.

[0009] Furthermore, before controlling the closing of the switches on the high-voltage and low-voltage sides of the transformer, the control module determines whether the transformer meets the conditions: the high-voltage side circuit breaker is closed and the low-voltage side circuit breaker is opened; if the conditions are not met, an alarm signal is issued and the transformer is skipped.

[0010] Furthermore, a first camera device is communicatively connected to the control module; the first camera device is arranged in the transformer box, and is used to obtain and send images of switch status indication devices including the high-voltage side and the low-voltage side of the transformer to the control module.

[0011] Furthermore, a second camera device is communicatively connected to the control module; the second camera device is arranged at the angle between the oil level gauge surface of the transformer oil pillow and the gas relay surface, and is used to obtain the appearance picture of the transformer to the control module.

[0012] Furthermore, a third camera device is communicatively connected to the control module, and the third camera device takes and sends a picture of the surrounding environment of the transformer to the controller; the controller determines whether there are people stranded based on the picture of the surrounding environment of the transformer; if there are people stranded, the high-voltage and low-voltage side switches of the transformer are stopped from closing.

[0013] Furthermore, the first camera device, the second camera device, and the third camera device are all equipped with infrared temperature sensors; if the temperature measured by the infrared temperature sensor exceeds the temperature threshold, the infrared temperature data is sent to the control module, and the control module stops closing the switches on the high-voltage side and the low-voltage side of the transformer.

[0014] Furthermore, the time t is 3 seconds.

[0015] Furthermore, an uninterruptible power supply is used to supply power to multiple switch controllers of a transformer; the control module controls the uninterruptible power supply switch to close before controlling the switches on the high-voltage side and the low-voltage side of the transformer to close; the control module controls the uninterruptible power supply switch to open after controlling the switches on the high-voltage side and the low-voltage side of the transformer to open.

[0016] Furthermore, a signal sensor is arranged at the transformer door, and the signal sensor is used to transmit the transformer door opening status information to the control module; the control module stops the closing of the transformer high-voltage side and low-voltage side switches according to the door opening status information.

[0017] Furthermore, after closing the switches on the high-voltage and low-voltage sides of the control transformer, the control module determines whether the transformer operation data is abnormal. If there is no abnormal data, a start signal is sent to the fan monitoring system; the fan monitoring system starts the fan corresponding to the transformer.

[0018] The present invention has the following beneficial effects:

[0019] 1. Use a controller with the function of starting the box-type transformer in sequence to realize the automatic start and stop of the box-type transformer, without the need for staff to manually start the box-type transformer, thus reducing the workload of staff.

[0020] 2. The multiple optical fibers in the present invention form a ring network arrangement to ensure that the communication of all box-type transformers is not interrupted due to power failure of a single box-type transformer.

[0021] 3. The present invention selects the interval time t as 3 seconds according to the attenuation simulation waveform of the box-type transformer starting current, which effectively avoids the large current caused by the simultaneous starting of multiple box-type transformers and avoids the malfunction of the collector line protection;

[0022] 4. The present invention respectively arranges a first camera device and a second camera device inside and outside the box-type transformer. By using the data collected by the two cameras, it can be determined whether the transformer should be started in sequence, ensuring that the box-type transformer is started in a safe state, and ensuring the safety of the sequential starting of the box-type transformer.

[0023] 5. The control module in the present invention performs five-defense logic judgment, switch state judgment and protection state judgment on the box-type transformer to ensure that the box-type transformer starts in a safe state and guarantees the safety of the sequential starting of the box-type transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is the transformer excitation inrush current simulation waveform. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Embodiment 1

[0028] See also Figure 1 , a mountain box-type transformer control system, comprising: a control module and n transformers;

[0029] The control module is connected to the first transformer through a first optical fiber, and the i-th transformer is connected to the i+1-th transformer through an i+1-th optical fiber (i=1, ..., n-1);

[0030] The control module is provided with a timer t for obtaining the status information of the transformer and controlling the opening or closing of the switches on the high-voltage side and the low-voltage side of the n transformers at intervals of time t in sequence, specifically:

[0031] The status information of the transformer includes the real-time values ​​of the transformer's multi-channel switch quantities, such as heavy gas, light gas, ultra-high temperature, high temperature, low oil level, abnormal pressure, differential protection action, high-voltage overcurrent protection action, non-electrical quantity 1-4, high-voltage side circuit breaker, high-voltage side isolation switch, high-voltage side grounding switch, low-voltage side circuit breaker and other switch action states.

[0032] The real-time value of the switch quantity of the i-th transformer is returned to the control module through optical fiber communication; the control module compares the real-time value of the switch quantity with the preset value. If they are completely consistent, the control module controls the switches on the high-voltage side and the low-voltage side of the i-th transformer to close after an interval of 3 seconds; otherwise, the control module skips the i-th transformer and tries to obtain the status information of the i+1-th transformer and issues an alarm message.

[0033] Embodiment 2

[0034] The control module is newly connected to a 24-core optical fiber, which communicates with the nth transformer through the n+1th optical fiber. The optical fiber communication forms a ring network layout to ensure that the communication of all box-type transformers is not interrupted due to power failure of a single box-type transformer.

[0035] Embodiment 3

[0036] In the process of power transmission of the transformer in the whole station, the existing control interval time mostly relies on human experience and judgment, the time interval fluctuates greatly, and there is no scientific and accurate interval time control. This embodiment fully considers the influence of the excitation inrush current of the box-type transformer, selects the appropriate interval time, and ensures the scientific and safe start and stop of the box-type transformer.

[0037] Taking the Taikai box-type transformer S11-2700 / 35 three-phase transformer as an example, the excitation inrush current simulation is carried out (the excitation inrush current simulation waveform is as follows Figure 2 As shown). The peak value of the high-voltage side excitation surge current (phase current) of this box-type transformer can reach 136A, which is 136 / 24.5=5.55 times the rated phase current. After the transformer is no-loaded and closed, the excitation surge current can decay to the rated phase current after about 0.6S. After about 2.5S, the transformer excitation surge current decays to the steady-state no-load current.

[0038] Therefore, the interval time t is selected as 3 seconds to ensure that the startup of the transformer is not affected by the excitation inrush current.

[0039] Embodiment 4

[0040] On the basis of the first embodiment, it also includes a first camera device, a second camera device and a third camera device which are communicatively connected to the control module via optical fibers.

[0041] The first camera device is arranged in the transformer box, has an infrared night vision function, can rotate 350° horizontally and 0 to 90° vertically, and is used to obtain and send images of the switch status indication devices on the high-voltage side and low-voltage side of the transformer, images of the alarm devices of the measurement and control device, and images of the trip light to the control module.

[0042] The second camera device is arranged at the angle between the oil level gauge surface of the transformer oil conservator and the gas relay surface, and is used to obtain and send the transformer appearance picture (the appearance picture at least includes the oil tank and the gas relay) to the control module.

[0043] The controller analyzes the status of the equipment in the received image and determines whether the transformer should be started in sequence. Each transformer meets the starting conditions before starting, ensuring that the box-type transformer starts in a safe state and the safety of the sequential start of the equipment.

[0044] The third camera device is installed 10 to 15 meters away from the opposite side of the box-type transformer door, and takes and sends pictures of the transformer's surrounding environment to the controller; the controller determines whether there are people stranded based on the pictures of the transformer's surrounding environment; if there are people stranded, the high-voltage and low-voltage side switches of the transformer are stopped from closing.

[0045] A signal sensor is arranged at the transformer door, and the signal sensor is used to transmit the transformer door opening status information to the control module; the control module stops the closing of the high-voltage side and low-voltage side switches of the transformer according to the door opening status information.

[0046] The first camera device, the second camera device, and the third camera device are all equipped with infrared temperature sensors; if the temperature measured by the infrared temperature sensor exceeds 100 degrees Celsius, the infrared temperature data is sent to the control module, and the control module stops closing the switches on the high-voltage side and the low-voltage side of the transformer.

[0047] Embodiment 5

[0048] The uninterruptible power supply UPS supplies power to multiple switch controllers in the transformer (such as high-voltage circuit breaker control power supply, low-voltage circuit breaker control power supply, electromagnetic lock power supply, etc.). The control module controls the uninterruptible power supply switch to close before closing the switches on the high-voltage side and low-voltage side of the transformer; the control module controls the uninterruptible power supply switch to open after opening the switches on the high-voltage side and low-voltage side of the transformer.

[0049] When the transformer is out of power, multiple switch controllers and other power loads connected to the UPS will still consume UPS power. The improvement of this embodiment is that by controlling the uninterruptible power supply switch to close or open before and after the switches on the high-voltage side and the low-voltage side of the transformer are closed, the UPS life is extended to meet the remote control requirements.

[0050] Embodiment 6

[0051] The controller analyzes the status of the equipment in the received image and determines whether the transformer should be started in sequence. Each transformer meets the starting conditions before starting, ensuring that the box-type transformer starts in a safe state and the safety of the sequential start of the equipment.

[0052] The control module controls the uninterruptible power supply UPS switch to close. Before closing the switch on the high-voltage side of the control box-type transformer, determine whether the following conditions are met: the high-voltage side circuit breaker is open, the high-voltage side isolation knife switch is closed, the high-voltage side grounding knife switch is closed and open, the low-voltage side circuit breaker is open, the box-type transformer door is closed, no one is stranded around, the infrared temperature does not exceed the threshold, and there is no abnormal tripping or alarm signal (such as heavy gas tripping, ultra-high temperature tripping, pressure relief valve tripping, circuit breaker protection tripping, light gas alarm, high temperature alarm, low oil level alarm, high oil level alarm). If the above conditions are not met, an abnormal alarm is issued and the box-type transformer is skipped, and the next box-type transformer is tried to start in the pre-set order.

[0053] Before closing the low-voltage side switch of the box-type transformer, determine whether the conditions are met: the high-voltage side circuit breaker is closed and the low-voltage side circuit breaker is opened. If the above conditions are not met, an abnormal alarm will be issued and the box-type transformer will be skipped, and the next box-type transformer will be tried to start in the pre-set order.

[0054] After the high-voltage and low-voltage side switches of the box-type transformer are closed, the control module determines whether the transformer operation data is abnormal, such as the high-voltage and low-voltage side voltages, frequencies, and transformer oil temperature. If the operation data exceeds the preset threshold, it is determined to be abnormal data. If there is no abnormal data, a start signal is sent to the fan monitoring system, and the fan monitoring system automatically checks, resets, and starts the fan corresponding to the box-type transformer.

[0055] The improvement of this embodiment is that the control module performs five-defense logic judgment, switch state judgment and protection state judgment on the box-type transformer, ensuring that the box-type transformer starts in a safe state and ensuring the safety of the sequential starting of the box-type transformer.

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A mountain box-type transformer control system, characterized in that: include: Control module and n transformers; The control module is connected to the first transformer through the first optical fiber, the i-th transformer is connected to the i+1-th transformer through the i+1-th optical fiber, and the control module is connected to the n-th transformer through the n+1-th optical fiber (i=1, ..., n-1); The control module is provided with a timer t for obtaining the status information of the transformer and sequentially controlling the opening or closing of the switches on the high-voltage side and the low-voltage side of the n transformers at intervals of t; Before controlling the closing of the switches on the high-voltage and low-voltage sides of the transformer, the control module determines whether the transformer meets the conditions: the high-voltage side circuit breaker is closed and the low-voltage side circuit breaker is open; if the conditions are not met, an alarm signal is issued and the transformer is skipped; The status information of the transformer includes the real-time value of the multi-channel switch quantity of the transformer, and the real-time value of the switch quantity of the i-th transformer is returned to the control module through optical fiber communication; the control module compares the real-time value of the switch quantity with the preset value, and if they are completely consistent, the control module controls the switch on the high-voltage side and the low-voltage side of the i-th transformer to close after an interval of time t; otherwise, the control module skips the i-th transformer and tries to obtain the status information of the i+1-th transformer and issues an alarm message; It also includes the steps of: considering the influence of the excitation surge current of the box-type transformer, selecting the value of the time t, specifically: firstly performing an excitation surge current simulation to obtain the peak value of the excitation surge current on the high-voltage side of the corresponding transformer, and then calculating the time for the excitation surge current to decay to the rated phase current after the transformer is no-loaded and turned, and calculating the time for the excitation surge current of the transformer to decay to a steady-state no-load current; according to the calculated time for the excitation surge current to decay to the rated phase current and the time for the excitation surge current to decay to the steady-state no-load current, the interval time t is determined to be 3 seconds.

2. A mountain box-type transformer control system according to claim 1, characterized in that: Also includes: A first camera device is communicatively connected to the control module; the first camera device is arranged in the transformer box, and is used to obtain and send images of switch status indication devices including the high-voltage side and the low-voltage side of the transformer to the control module.

3. A mountain box-type transformer control system according to claim 2, characterized in that: Also includes: A second camera device is communicatively connected to the control module; the second camera device is arranged at the angle between the oil level gauge surface of the transformer oil pillow and the gas relay surface, and is used to obtain the appearance picture of the transformer to the control module.

4. A mountain box-type transformer control system according to claim 3, characterized in that: Also includes: A third camera device is communicatively connected to the control module, and the third camera device takes and sends a picture of the surrounding environment of the transformer to the controller; the controller determines whether there are people stranded based on the picture of the surrounding environment of the transformer; if there are people stranded, the high-voltage side and low-voltage side switches of the transformer are stopped from closing.

5. A mountain box-type transformer control system according to claim 4, characterized in that: The first camera device, the second camera device, and the third camera device are all equipped with infrared temperature sensors; if the temperature measured by the infrared temperature sensor exceeds the temperature threshold, the infrared temperature data is sent to the control module, and the control module stops the closing of the high-voltage and low-voltage side switches of the transformer.

6. A mountain box-type transformer control system according to claim 1, characterized in that: Also includes: An uninterruptible power supply is used to supply power to multiple switch controllers of a transformer; the control module controls the uninterruptible power supply switch to close before controlling the switches on the high-voltage side and the low-voltage side of the transformer to close; the control module controls the uninterruptible power supply switch to open after controlling the switches on the high-voltage side and the low-voltage side of the transformer to open.

7. A mountain box-type transformer control system according to claim 1, characterized in that: Also includes: A signal sensor is arranged at the transformer box door, and the signal sensor is used to transmit transformer door opening status information to the control module; The control module stops closing the switches on the high-voltage and low-voltage sides of the transformer based on the door opening status information.

8. A mountain box-type transformer control system according to claim 1, characterized in that: Also includes: After closing the switches on the high-voltage and low-voltage sides of the control transformer, the control module determines whether the transformer operation data is abnormal. If there is no abnormal data, a start signal is sent to the fan monitoring system; the fan monitoring system starts the fan corresponding to the transformer.

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