Turn-to-turn short circuit monitoring device for stator winding of cooling fan of electric energy storage device

Abstract

The utility model relates to an electric power energy storage device cooling fan stator winding turn-to-turn short circuit monitoring device comprising a cooling fan stator winding three-phase voltage detection module, the output end of which is connected with the first input end of a central processing module, and the output end of a cooling fan rotating speed detection module is connected with the second input end of the central processing module. The output end of the pulse detection signal generating module is connected with the third input end of the central processing module, the output end of the detection signal receiving module is connected with the fourth input end of the central processing module, the output end of the operation panel is connected with the fifth input end of the central processing module, and the first output end of the central processing module is connected with the display screen. The second output end of the central processing module is connected with the alarm module. According to the utility model, long-term on-line monitoring is realized, the monitoring precision and the monitoring speed are improved, and safe operation of the electric power energy storage device is ensured; and when turn-to-turn short circuit occurs in the stator winding of the cooling fan of the electric energy storage device, online sound-light alarm can be performed.

Description

Technical Field

[0001] The utility model relates to the technical field of power energy storage device fault diagnosis, in particular to a monitoring device for inter-turn short circuit of the stator winding of a cooling fan of a power energy storage device. Background Art

[0002] With the continuous growth of energy demand and the country's emphasis on renewable energy, power energy storage devices are increasingly widely used. However, a large amount of heat is generated during the operation of power energy storage devices. When the temperature is too high, a cooling fan is required for heat dissipation. If the heat dissipation is not timely, it will affect its performance and service life, and even lead to production safety accidents. Therefore, it is crucial to conduct on-line monitoring and fault diagnosis on the cooling fan of the power energy storage device.

[0003] Inter-turn short circuit of the stator winding is one of the main fault sources of the cooling fan of the power energy storage device. The main causes of this short circuit fault include: winding dirt, long operation years and insulation aging; poor manufacturing process, damage to the inter-turn insulation during processes such as wire laying and shaping; during operation, under the combined action of electrical, thermal and mechanical stresses, the winding deforms and displaces, resulting in the fracture and shedding of the inter-turn insulation, etc. A slight inter-turn short circuit will affect the operation stability of the cooling fan. However, if the slight fault is allowed to continue to develop, it will expand into a multi-turn coil short circuit fault, and then develop into serious phase-to-phase short circuit and other faults. These faults pose a serious threat to the safe operation of the cooling fan and may even cause the cooling fan to stop.

[0004] Most of the existing technologies use single electrical parameter analysis or data-driven fault diagnosis to detect the inter-turn short circuit fault of the stator winding of the cooling fan of the power energy storage device. However, most power energy storage devices are outdoors, the operating environment of the cooling fan is harsh and the fault sample data is lacking, resulting in it being difficult to guarantee the diagnosis accuracy. Therefore, providing a stable monitoring device for inter-turn short circuit of the stator winding of the cooling fan of the power energy storage device, making up for the monitoring dead zone of the single electrical parameter method, and improving the speed and accuracy of monitoring the inter-turn short circuit of the stator winding of the cooling fan are problems that need to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the problems of slow monitoring speed and low accuracy in monitoring the inter-turn short circuit fault of the stator winding of the cooling fan of the power energy storage device, the purpose of the utility model is to provide a monitoring device for inter-turn short circuit of the stator winding of the cooling fan of the power energy storage device, which can achieve long-term on-line monitoring, improve the monitoring accuracy and speed, and ensure the safe operation of the power energy storage device.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A monitoring device for inter-turn short circuit of the stator winding of a cooling fan of a power energy storage device, comprising a three-phase voltage detection module for the stator winding of the cooling fan, a cooling fan speed detection module, a central processing module, a pulse detection signal generation module, a detection signal receiving module, an alarm module, a display screen and an operation panel. The output end of the three-phase voltage detection module for the stator winding of the cooling fan is connected to the first input end of the central processing module. The output end of the cooling fan speed detection module is connected to the second input end of the central processing module. The output end of the pulse detection signal generation module is connected to the third input end of the central processing module. The output end of the detection signal receiving module is connected to the fourth input end of the central processing module. The output end of the operation panel is connected to the fifth input end of the central processing module. The first output end of the central processing module is connected to the display screen. The second output end of the central processing module is connected to the alarm module.

[0007] The central processing module includes:

[0008] An ARM chip, model number ARM940T, is used to process the voltage, speed, keys on the operation panel, and pulse detection signals input by the I / O peripherals, and output the processed results to the alarm module and the display screen through the I / O peripherals;

[0009] A dual-port RAM is used to store the data information generated during the operation of the monitoring device for inter-turn short circuit of the stator winding of the cooling fan of the power energy storage device;

[0010] I / O peripherals are used to input signals into the central processing module and output the output signals of the central processing module to the alarm module and the display screen.

[0011] The three-phase voltage detection module for the stator winding of the cooling fan includes a voltage transformer and a voltage transmitter. The voltage transformer is connected to the outgoing line ends of the three-phase windings of the cooling fan stator. The output end of the voltage transformer is connected to the input end of the voltage transmitter. The output end of the voltage transmitter is connected to the first input end of the central processing module. The three-phase voltage detection module for the stator winding of the cooling fan converts the detected three-phase stator voltage into a DC signal of 4 mA to 20 mA and transmits it to the central processing module.

[0012] The cooling fan speed detection module includes a speed sensor and a speed transmitter. The speed sensor is installed at the tail of the cooling fan. The speed sensor transmits the measured cooling fan speed to the speed transmitter through the cooling fan speed signal acquisition interface. The speed transmitter converts the cooling fan speed signal into a 4 to 20 mA DC signal and transmits it to the central processing module.

[0013] The alarm module includes an alarm status light and a speaker.

[0014] The operation panel includes ten buttons: up, down, left, right, three-phase voltage, cooling fan speed, pulse detection signal transmission, detection signal reception, confirmation, and exit.

[0015] The three-phase voltage detection module of the cooling fan stator winding, the cooling fan speed detection module, the pulse detection signal generation module, the detection signal reception module, the central processing module, the alarm module, the display screen, and the operation panel are integrated in a chassis.

[0016] The display screen shows the three-phase voltage value of the cooling fan stator winding in the normal state, the three-phase voltage value of the cooling fan stator winding in the current state, the maximum voltage deviation rate, the cooling fan speed value in the normal state, the cooling fan speed value in the current state, the maximum speed deviation rate, the pulse detection signal transmission waveform, and the received detection signal waveform.

[0017] As can be seen from the above technical solutions, the beneficial effects of the present utility model are as follows: First, the present utility model adopts a monitoring method that combines voltage and speed, selects the three-phase voltage deviation rate of the cooling fan stator winding and the cooling fan speed deviation rate as parameters, realizes long-term online monitoring, improves the monitoring accuracy and speed, and ensures the safe operation of the power energy storage device; Second, the present utility model can perform on-line sound and light alarms when an inter-turn short circuit occurs in the cooling fan stator winding of the power energy storage device, and helps maintenance personnel further check the fault situation through the pulse detection signal method in the offline state. Description of the Drawings

[0018] Figure 1 is the circuit block diagram of the present utility model;

[0019] Figure 2 is the front view of the present utility model;

[0020] Figure 3 is the rear view of the present utility model. Detailed Embodiment

[0021] Such as Figure 1As shown in the figure, a monitoring device for inter-turn short circuit of the stator winding of a cooling fan of a power energy storage device includes a three-phase voltage detection module for the stator winding of the cooling fan, a cooling fan speed detection module, a central processing module, a pulse detection signal generation module, a detection signal receiving module, an alarm module 1, a display screen 2, and an operation panel 3. The output end of the three-phase voltage detection module for the stator winding of the cooling fan is connected to the first input end of the central processing module. The output end of the cooling fan speed detection module is connected to the second input end of the central processing module. The output end of the pulse detection signal generation module is connected to the third input end of the central processing module. The output end of the detection signal receiving module is connected to the fourth input end of the central processing module. The output end of the operation panel 3 is connected to the fifth input end of the central processing module. The first output end of the central processing module is connected to the display screen 2. The second output end of the central processing module is connected to the alarm module 1.

[0022] The central processing module includes:

[0023] An ARM chip, model number ARM940T, is used to process the voltage, speed, keys on the operation panel 3, and pulse detection signals input by I / O peripherals, and output the processed results to the alarm module 1 and the display screen 2 through I / O peripherals;

[0024] A dual-port RAM is used to store the data information generated during the operation of the monitoring device for inter-turn short circuit of the stator winding of the cooling fan of the power energy storage device;

[0025] I / O peripherals are used to input signals into the central processing module and output the output signals of the central processing module to the alarm module 1 and the display screen 2.

[0026] The three-phase voltage detection module for the stator winding of the cooling fan includes a voltage transformer and a voltage transmitter. The voltage transformer is connected to the outgoing line ends of the three-phase windings of the stator of the cooling fan. The output end of the voltage transformer is connected to the input end of the voltage transmitter. The output end of the voltage transmitter is connected to the first input end of the central processing module. The three-phase voltage detection module for the stator winding of the cooling fan converts the detected three-phase stator voltage into a 4 to 20 mA DC signal and transmits it to the central processing module.

[0027] The cooling fan speed detection module includes a speed sensor and a speed transmitter. The speed sensor is installed at the tail of the cooling fan. The speed sensor transmits the measured cooling fan speed to the speed transmitter through the cooling fan speed signal acquisition interface 5. The speed transmitter converts the cooling fan speed signal into a 4 mA to 20 mA DC signal and transmits it to the central processing module.

[0028] The alarm module 1 includes an alarm status light and a speaker.

[0029] The operation panel 3 includes ten buttons, namely up, down, left, right, three-phase voltage, cooling fan speed, pulse detection signal transmission, detection signal reception, confirmation, and exit.

[0030] The three-phase voltage detection module of the cooling fan stator winding, the cooling fan speed detection module, the pulse detection signal generation module, the detection signal reception module, the central processing module, the alarm module 1, the display screen 2, and the operation panel 3 are integrated in a chassis.

[0031] The display screen 2 displays the three-phase voltage value of the cooling fan stator winding in the normal state, the three-phase voltage value of the cooling fan stator winding in the current state, the maximum deviation rate of the voltage value, the normal state cooling fan speed value, the current state cooling fan speed value, the maximum deviation rate of the speed value, the pulse detection signal transmission waveform, and the received detection signal waveform.

[0032] When the cooling fan of the power energy storage device is in the operating state, compare the current three-phase voltage value of the cooling fan stator with the three-phase voltage value of the normal state stator, and compare the current cooling fan speed with the cooling fan speed in the normal state. When the maximum deviation rates of the voltage value and the speed value exceed the specified range, the system determines that there is an inter-turn short circuit in the stator winding of the cooling fan of the power energy storage device. The alarm status light flashes and the speaker emits an alarm sound; stop the fan for fault inspection. The pulse detection signal generation module emits a target characteristic response waveform, and observe and compare the real-time characteristic response waveform received by the detection signal reception module on the display screen 2 with the target characteristic response waveform to analyze the fault information of the inter-turn short circuit in the stator winding of the cooling fan.

[0033] The following Figures 1 to 3 further describes the present utility model.

[0034] As Figure 2 、 3 shown, the three-phase voltage detection module of the cooling fan stator winding is connected to the three-phase outlet terminals of the cooling fan stator winding through a voltage transformer for measuring the three-phase voltage of the cooling fan stator; a total of 3 voltage transformers are set to measure the phase voltages of the U, V, and W phases of the cooling fan stator in real time; the measured three-phase voltage signals are transmitted to the three-phase voltage detection module of the cooling fan stator winding through the voltage acquisition interface 4, and the voltage transmitter in the three-phase voltage detection module of the cooling fan stator winding converts the three-phase voltage signals into DC signals of 4 mA to 20 mA and transmits them to the central processing module.

[0035] The alarm module 1 is connected to the central processing module through a digital pulse alarm trigger circuit. When the system determines that there is an inter-turn short circuit in the stator winding of the cooling fan of the power energy storage device, the central processing module issues a control instruction to the pulse alarm trigger circuit, and then drives the alarm module 1 to perform an audible and visual alarm.

[0036] The monitoring device for inter-turn short circuit of the stator winding of the cooling fan of the entire power energy storage device is also provided with a power interface 6 and a power switch 7.

[0037] When the installation and commissioning of the cooling fan of the power energy storage device are completed or the maintenance is finished, the cooling fan is in a normal operating condition at this time. The process of obtaining the three-phase voltage values of the stator winding of the cooling fan under normal conditions is as follows: Press the three-phase voltage button, and at this time, the monitoring device automatically collects the three-phase voltage values of U, V, and W of the stator winding of the cooling fan, and the collection time is 10 minutes; the process of obtaining the rotational speed value of the cooling fan under normal conditions is as follows: Press the rotational speed button of the cooling fan, and at this time, the monitoring device automatically collects the rotational speed value of the cooling fan, and the collection time is 10 minutes; on the operation panel 3, set the upper limit of the deviation rate alarm for the three-phase voltage of the stator winding of the cooling fan and the rotational speed of the cooling fan respectively through the up, down, left, and right four keys; press the confirmation button, and the monitoring device will save the average values of the three-phase voltage of the stator winding of the cooling fan and the rotational speed of the cooling fan within their respective specified collection times as the three-phase voltage values and rotational speed values of the stator winding of the cooling fan under normal conditions.

[0038] Press the exit key, and the display screen 2 will display the three-phase voltage values of U, V, and W of the stator winding of the cooling fan under normal conditions that have been collected, the current real-time three-phase voltage values of the stator winding of the cooling fan, the deviation rate of the three-phase voltage of the stator winding of the cooling fan, the rotational speed value of the cooling fan under normal conditions that have been collected, the current real-time rotational speed value of the cooling fan, and the deviation rate of the rotational speed of the cooling fan.

[0039] When the deviation rate of any phase of the three-phase voltage of the stator winding of the cooling fan exceeds the alarm upper limit, and the deviation rate of the rotational speed of the cooling fan also exceeds the alarm upper limit, at this time, the alarm status light flashes and the speaker emits an alarm sound, indicating that an inter-turn short circuit fault has occurred in the stator winding of the cooling fan.

[0040] When the alarm module 1 gives an audible and visual alarm, the fan should be stopped immediately for inspection; the pulse detection signal generation module and the detection signal reception module are connected to the phase where the short circuit fault is determined by the system through a connecting wire. At this time, press the pulse detection signal emission button, and the pulse detection signal generation module emits a low-voltage detection pulse signal. The low-voltage detection pulse signal will experience multiple reflections and refractions at the fault point where the short circuit occurs. Press the detection signal reception button, and the display screen 2 will simultaneously display the detection pulse waveforms emitted by the pulse detection signal generation module and received by the detection signal reception module. Comparing and analyzing these two waveforms is beneficial for professional maintenance personnel to further diagnose the inter-turn short circuit fault of the stator winding of the cooling fan.

[0041] In summary, the utility model adopts a monitoring method that combines voltage and speed. By selecting the three-phase voltage deviation rate of the stator winding of the cooling fan and the speed deviation rate of the cooling fan as parameters, long-term online monitoring is achieved, improving the monitoring accuracy and speed, and ensuring the safe operation of the power energy storage device. When an inter-turn short circuit occurs in the stator winding of the cooling fan of the power energy storage device, the utility model can give an on-line audible and visual alarm, and help maintenance personnel further check the fault condition by the pulse detection signal method in the off-line state.

Claims

1. A device for monitoring short circuits between stator winding turns of a cooling fan of an electric energy storage device, characterized in that: The invention comprises a cooling fan stator winding three-phase voltage detection module, a cooling fan speed detection module, a central processing module, a pulse detection signal generating module, a detection signal receiving module, an alarm module (1), a display screen (2) and an operation panel (3), wherein the output end of the cooling fan stator winding three-phase voltage detection module is connected to the first input end of the central processing module, the output end of the cooling fan speed detection module is connected to the second input end of the central processing module, the output end of the pulse detection signal generating module is connected to the third input end of the central processing module, the output end of the detection signal receiving module is connected to the fourth input end of the central processing module, the output end of the operation panel (3) is connected to the fifth input end of the central processing module, the first output end of the central processing module is connected to the display screen (2), and the second output end of the central processing module is connected to the alarm module (1).

2. The device for monitoring inter-turn short circuit of stator winding of cooling fan of electric energy storage device according to claim 1, characterized in that: The central processing module comprises: The ARM chip, model ARM940T, is used to process the voltage, rotation speed, key of the operation panel, and pulse detection signal input by the I / O peripherals, and output the processed results to the alarm module (1) and the display screen (2) via the I / O peripherals; Dual-port RAM, used to store data information generated during the operation of the stator winding inter-turn short-circuit monitoring device of the cooling fan of the power storage device; The I / O peripheral is used to input signals into the central processing module and output the output signals of the central processing module to the alarm module (1) and the display screen (2).

3. The device for monitoring inter-turn short circuit of stator winding of cooling fan of electric energy storage device according to claim 1, characterized in that: The cooling fan stator winding three-phase voltage detection module includes a voltage transformer and a voltage transmitter. The voltage transformer is connected to the cooling fan stator three-phase winding output terminal, the output end of the voltage transformer is connected to the input end of the voltage transmitter, and the output end of the voltage transmitter is connected to the first input end of the central processing module. The cooling fan stator winding three-phase voltage detection module converts the detected stator three-phase voltage into a 4mA to 20mA DC signal and transmits it to the central processing module.

4. The device for monitoring inter-turn short circuit of stator winding of cooling fan of electric energy storage device according to claim 1, characterized in that: The cooling fan speed detection module comprises a speed sensor and a speed transmitter. The speed sensor is installed at the rear of the cooling fan. The speed sensor transmits the measured cooling fan speed to the speed transmitter through the cooling fan speed signal acquisition interface (5). The speed transmitter converts the cooling fan speed signal into a 4 to 20 mA DC signal and transmits it to the central processing module.

5. The device for monitoring inter-turn short circuit of stator winding of cooling fan of electric energy storage device according to claim 1, characterized in that: The alarm module (1) comprises an alarm status light and a speaker.

6. The device for monitoring inter-turn short circuit of stator winding of cooling fan of electric energy storage device according to claim 1, characterized in that: The operation panel (3) comprises ten buttons in total, namely, up, down, left, right, three-phase voltage, cooling fan speed, pulse detection signal transmission, detection signal reception, confirmation and exit.

7. The device for monitoring inter-turn short circuit of stator winding of cooling fan of electric energy storage device according to claim 1, characterized in that: The cooling fan stator winding three-phase voltage detection module, the cooling fan speed detection module, the pulse detection signal generation module, the detection signal receiving module, the central processing module, the alarm module (1), the display screen (2) and the operation panel (3) are integrated in a chassis.

8. The device for monitoring inter-turn short circuit of stator winding of cooling fan of electric energy storage device according to claim 1, characterized in that: The display screen (2) displays the three-phase voltage value of the cooling fan stator winding in a normal state, the three-phase voltage value of the cooling fan stator winding in a current state, the maximum deviation rate of the voltage value, the speed value of the cooling fan in a normal state, the speed value of the cooling fan in a current state, the maximum deviation rate of the speed value, the pulse detection signal transmission waveform, and the received detection signal waveform.

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