Discharge detection method and system based on constant temperature crystal oscillator temperature control

Abstract

The invention provides a discharge detection method and system based on constant temperature crystal oscillator temperature control, and the method comprises the steps: receiving a target temperature value from a host, obtaining an original temperature value, feeding back the original temperature value to the host, and carrying out the slave temperature control operation based on the original temperature value and the target temperature value; a current temperature value is obtained in real time, and when the current temperature value meets a preset steady-state condition, a temperature control success signal is sent to the host, so that the host sends a synchronous time service signal based on the temperature control success signal; executing synchronous time service in response to the synchronous time service signal, and sending a time service completion signal to the host, so that the host sends a signal acquisition instruction according to the time service completion signal; and in response to the signal acquisition instruction, acquiring a partial discharge signal and obtaining positioning of partial discharge based on the partial discharge signal. According to the discharge detection method and system based on constant-temperature crystal oscillator temperature control, a consistent working environment is provided for synchronous time service and partial discharge signal acquisition, and the precision of synchronous time service and partial discharge positioning is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of partial discharge detection, and in particular to a discharge detection method and system based on constant temperature crystal oscillator temperature control. Background Art

[0002] With the advent of the intelligent information age, electricity has become an indispensable energy source in people's daily lives, and power supply reliability is related to people's daily lives and production lives. In the urban distribution network system, power cables of various voltage levels gradually form a complex distribution network. Power cables are typical capacitive power equipment, but local insulation damage will cause the failure of the entire insulation system. Therefore, the realization of cable insulation status monitoring is the key to the safe and stable operation of the urban power system. In the current cable partial discharge detection work, the positioning of partial discharge is particularly important.

[0003] The current local discharge positioning methods are divided into two categories: single-end positioning method and double-end positioning method: (1) Single-end positioning method, that is, installing a local discharge sensor at one end of the cable. The sensor generally used is a high-frequency current sensor to detect the local discharge signal. Its positioning principle is: when local discharge occurs somewhere in the cable, the local discharge signal will start from the discharge point and transmit to the two ends of the cable. During the transmission process, the signal must pass through the location of the sensor and be detected; at the same time, when this signal is transmitted to the open-circuit port of the cable at the far end, it will generate total reflection and transmit in the opposite direction to the sensor side. That is, in this process, the sensor will detect the signal generated by the local discharge twice, so that the distance value of the local discharge point from the sensor installation point can be calculated by the time difference. (2) Double-end positioning method, two data recording modules with data acquisition function and clock synchronization function are installed at both ends of the cable. The calculation of the discharge position is realized by recording the local discharge signal and the time difference when it reaches the sensor. This method is suitable for longer cables and makes up for the limitation of the single-end positioning method on the transmission distance.

[0004] The double-end positioning method can effectively improve the detection length of partial discharge positioning, but it needs to achieve absolutely accurate time synchronization during its use to ensure the accuracy of the positioning results. However, it is found in use that the synchronous timing function generally has the problem of low timing accuracy. The reason for this shortcoming is that in the process of realizing the timing function, it is necessary to rely on a voltage-controlled constant temperature crystal oscillator to control the clock synchronized with the timing satellite. The constant temperature crystal oscillator is referred to as OCXO (OvenControlled Crystal Oscillator) in English. OCXO consists of a constant temperature tank control circuit and an oscillator circuit. The constant temperature tank is used to keep the temperature of the quartz crystal resonator in the crystal oscillator constant, thereby ensuring the constant frequency of the oscillator. Specifically, during the use of the constant temperature crystal oscillator, this constant temperature process is controlled by an internal constant temperature tank, that is, the constant temperature tank forms a local "constant temperature box" inside the crystal oscillator, thereby ensuring that the crystal oscillator outputs an oscillation signal with a stable frequency. This stable frequency oscillation signal is the key to ensuring stable timing. During use, the temperature control of the constant temperature bath inside the constant temperature crystal oscillator is greatly affected by the external environment. The internal constant temperature bath will continuously adjust its own heating value and other parameters as the external environment temperature changes. In the process of adjusting the temperature, its output frequency will fluctuate. Moreover, when the partial discharge locating module installed on the cable is in different external environments, this change will usually lead to a large timing error, reducing the accuracy of partial discharge locating. Summary of the invention

[0005] The present invention aims to provide a method, device and system for improving the timing accuracy of a constant temperature crystal oscillator, so as to solve the above-mentioned technical problems, reduce the influence of changes in external temperature, ventilation and the like on the timing accuracy, and effectively improve the timing accuracy.

[0006] In order to solve the above technical problems, the present invention provides a discharge detection method based on constant temperature crystal oscillator temperature control, which is applied to a slave node and includes the following steps:

[0007] Receive the target temperature value from the host, obtain the original temperature value and feed it back to the host, and perform the slave temperature control operation based on the original temperature value and the target temperature value;

[0008] Acquire the current temperature value in real time, and send a temperature control success signal to the host when the current temperature value meets the preset steady-state condition, so that the host sends a synchronous timing signal based on the temperature control success signal;

[0009] In response to the synchronous timing signal, synchronous timing is performed, and a completion timing signal is sent to the host, so that the host sends a signal acquisition instruction according to the completion timing signal;

[0010] In response to the signal collection instruction, the partial discharge signal is collected and the location of the partial discharge is obtained based on the partial discharge signal.

[0011] In the above scheme, a discharge detection method based on constant temperature crystal oscillator temperature control provided by the present invention realizes the setting and control of temperature through remote communication and temperature control operation, thereby providing a relatively consistent working environment for synchronous timing and partial discharge signal acquisition of different nodes, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0012] Furthermore, the real-time temperature value is obtained at a preset time interval and fed back to the host, so that the host obtains the temperature difference and the temperature change rate according to the real-time temperature value and the preset time interval, thereby enabling the host to obtain a difference judgment result based on the temperature difference and the preset difference range and obtain a change judgment result based on the temperature change rate and the preset change range, and then enabling the host to send a synchronous timing invalid instruction based on the difference judgment result and the change judgment result; and respond to the synchronous timing invalid instruction and stop collecting partial discharge signals based on the synchronous timing invalid instruction.

[0013] The above scheme ensures that the node and the host maintain the same temperature and working environment by real-time feedback of temperature information and working based on host instructions, so that the host node can determine whether partial discharge positioning can be carried out through temperature difference and temperature change rate detection, thereby ensuring the effectiveness of positioning.

[0014] Furthermore, the present invention also provides a discharge detection method based on constant temperature crystal oscillator temperature control, which is applied to a host node and includes the following steps:

[0015] Send the target temperature value to the slave node so that the slave starts to obtain the original temperature value, and then the slave performs the temperature control operation based on the original temperature value and the target temperature value, and the slave obtains the current temperature value in real time, and feeds back a temperature control success signal when the current temperature value meets the preset steady-state condition;

[0016] Obtain its own temperature value and perform host temperature control operations based on the target temperature value;

[0017] In response to the temperature control success signal, after the temperature control operation of the host is completed, the synchronous timing is started, and the synchronous timing signal is sent to the slave, so that the slave performs the synchronous timing based on the synchronous timing signal, and then the slave feeds back the completion timing signal after the synchronous timing;

[0018] In response to the completion of the timing signal, after the timing lock is completed, the partial discharge signal is collected, and a signal collection instruction is sent to the slave, so that the slave collects the partial discharge signal based on the signal collection instruction, and then obtains the location of the partial discharge based on the partial discharge signal.

[0019] The above scheme realizes the setting and control of temperature and the regulation of slave nodes through remote communication and temperature control operations, thereby ensuring the consistency and synchronization of the working environment of synchronous timing and partial discharge signal acquisition of the master and slave nodes, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0020] Further, a real-time temperature value from the slave is obtained at a preset time interval, so as to obtain a temperature difference and a temperature change rate based on the real-time temperature value and the preset time interval; a difference judgment result is obtained based on the temperature difference and a preset difference range, and a change judgment result is obtained based on the temperature change rate and the preset change range;

[0021] A synchronous timing invalid instruction is sent based on the difference judgment result and the change judgment result, so that the slave stops collecting partial discharge signals based on the synchronous timing invalid instruction.

[0022] The above scheme ensures that the node maintains a consistent temperature with the host and the stability of the working environment by receiving temperature information fed back in real time from the slave node, and determines whether partial discharge positioning can be carried out through temperature difference and temperature change rate detection, thereby ensuring the effectiveness of positioning.

[0023] Furthermore, the temperature difference and the temperature change rate are obtained based on the real-time temperature value and the preset time interval. The specific calculation process is as follows:

[0024] ΔT=|T m -T s

[0025]

[0026] Where: ΔT is the temperature difference, T m is the real-time temperature value, T s is the corresponding temperature value, k is the temperature change rate, t n and t 0 Indicates two different times, T n t n The real-time temperature value at the moment, T 0 t 0 Real-time temperature value at the moment.

[0027] The above scheme realizes the detection of the working environment of the slave through simple formula calculation, ensures the effectiveness of synchronous timing, and ensures the positioning accuracy of partial discharge.

[0028] The above scheme realizes communication between the master and slave machines as well as command sending and execution through remote communication, and realizes synchronous temperature control operation, thereby ensuring the consistency and synchronization of the working environment of synchronous timing and partial discharge signal acquisition of the master and slave machine nodes, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0029] The present invention also provides a discharge detection system based on constant temperature crystal oscillator temperature control, comprising a plurality of slave nodes and a host node; wherein the slave node comprises:

[0030] The main control module is used to communicate with the host and control the start-up of the temperature monitoring module, the synchronous timing module and the data acquisition module;

[0031] The temperature monitoring module is used to receive the target temperature value from the host, obtain the original temperature value and feed it back to the host, and perform the slave temperature control operation based on the original temperature value and the target temperature value, and obtain the current temperature value in real time, and when the current temperature value meets the preset steady-state condition, send a temperature control success signal to the host, so that the host sends a synchronous timing signal based on the temperature control success signal;

[0032] A synchronous timing module, used for executing synchronous timing in response to a synchronous timing signal, and sending a completion timing signal to the host, so that the host sends a signal acquisition instruction according to the completion timing signal;

[0033] The data acquisition module is used to collect partial discharge signals in response to the signal acquisition instruction and obtain the location of the partial discharge based on the partial discharge signals.

[0034] The system structure proposed in the above scheme is simple and easy to implement. It realizes communication with the host and controls the startup of each module through the main control module. The modules realize remote communication and temperature control operations through coordination and cooperation to set and control the temperature, thereby ensuring the consistency of the internal temperature of the system, providing a working environment that is relatively consistent with the host for the slave synchronous timing module and data acquisition module, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0035] Furthermore, the temperature monitoring module includes: a temperature sensing submodule, which is used to obtain the original temperature value and the current temperature value in real time; a temperature control submodule, which is used to perform slave temperature control operations based on the original temperature value and the target temperature value; a signal transmission submodule, which is used to feed back the original temperature value to the host, and send a temperature control success signal to the host when the current temperature value meets the preset steady-state condition, so that the host sends a synchronization timing signal based on the temperature control success signal.

[0036] The above scheme realizes the temperature detection and regulation of the node through the interaction of different sub-modules to ensure the temperature consistency with the host node.

[0037] Furthermore, a host node in a discharge detection system based on constant temperature crystal oscillator temperature control includes:

[0038] The host control module is used to communicate with the slaves and control the start-up of the host temperature monitoring module, the host synchronous timing module and the host data acquisition module;

[0039] The host temperature monitoring module is used to send the target temperature value to the slave node so that the slave starts to obtain the original temperature value, and then the slave performs the temperature control operation based on the original temperature value and the target temperature value, and enables the slave to obtain the current temperature value in real time, and feedback the temperature control success signal when the current temperature value meets the preset steady-state condition, and obtain its own temperature value and perform the host temperature control operation based on the target temperature value;

[0040] The host synchronous timing module is used to respond to the temperature control success signal, and start the synchronous timing after the host temperature control operation is completed, and send the synchronous timing signal to the slave, so that the slave performs the synchronous timing based on the synchronous timing signal, and then the slave feeds back the completion timing signal after the synchronous timing;

[0041] The host data acquisition module is used to respond to the completion timing signal, and start collecting partial discharge signals after completing the timing lock, and send a signal acquisition instruction to the slave, so that the slave collects the partial discharge signal based on the signal acquisition instruction, and then obtains the location of the partial discharge based on the partial discharge signal.

[0042] The above scheme realizes communication with the slave machine, sends instructions and controls the startup of each module of the host machine through the host main control module, and realizes temperature setting and regulation of the master and slave machine nodes through remote communication and coordination and cooperation between modules and temperature control operations, thereby ensuring the consistency of the internal temperature of the system, providing a more consistent working environment for the master and slave machine synchronous timing modules and data acquisition modules, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0043] Furthermore, the host temperature monitoring module also includes: an effective monitoring sub-module, which is used to obtain real-time temperature values ​​from the slave machine at preset time intervals, to obtain temperature difference and temperature change rate based on the real-time temperature value and the preset time interval, and to obtain difference judgment results based on the temperature difference and the preset difference range, and to obtain change judgment results based on the temperature change rate and the preset change range, thereby sending a synchronous timing invalid instruction based on the difference judgment result and the change judgment result, so that the slave machine stops collecting partial discharge signals based on the synchronous timing invalid instruction.

[0044] The above scheme increases the effective detection submodule and receives the temperature information of the slave node in real time, thereby ensuring that the node maintains the same temperature as the host and the stability of the working environment. It also calculates the temperature difference and the temperature change rate to determine whether partial discharge positioning can be carried out, thereby ensuring the effectiveness of positioning.

[0045] The system provided in this embodiment includes a plurality of slave nodes and a host node. The temperature setting in a plurality of node devices is realized through the control of the host node and the real-time feedback of the slave node, thereby providing a consistent and stable working environment for synchronous timing and partial discharge signal acquisition, and improving the accuracy of synchronous timing and partial discharge positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic flow chart of a discharge detection method based on constant temperature crystal oscillator temperature control and applied to a slave node provided in one embodiment of the present invention;

[0047] Figure 2 A schematic flow chart of a discharge detection method based on constant temperature crystal oscillator temperature control and applied to a host node provided by an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of a method for calculating a temperature change rate provided by an embodiment of the present invention;

[0049] Figure 4 A schematic diagram of a discharge detection device based on constant temperature crystal oscillator temperature control provided by an embodiment of the present invention;

[0050] Figure 5 A schematic diagram of the working process of a discharge detection device based on constant temperature crystal oscillator temperature control provided by one embodiment of the present invention;

[0051] Figure 6 A schematic diagram of a 1-host-1-slave installation method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Embodiment 1:

[0054] This embodiment provides a discharge detection method based on constant temperature crystal oscillator temperature control, which is applied to slave nodes. Figure 1 , specifically including the following steps:

[0055] Receive the target temperature value from the host, obtain the original temperature value and feed it back to the host, and perform the slave temperature control operation based on the original temperature value and the target temperature value;

[0056] Acquire the current temperature value in real time, and send a temperature control success signal to the host when the current temperature value meets the preset steady-state condition, so that the host sends a synchronous timing signal based on the temperature control success signal;

[0057] In response to the synchronous timing signal, synchronous timing is performed, and a completion timing signal is sent to the host, so that the host sends a signal acquisition instruction according to the completion timing signal;

[0058] In response to the signal collection instruction, the partial discharge signal is collected and the location of the partial discharge is obtained based on the partial discharge signal.

[0059] In the specific implementation process, the discharge detection method based on constant temperature crystal oscillator temperature control provided in this embodiment realizes the setting and control of temperature through remote communication and temperature control operation, thereby providing a relatively consistent working environment for synchronous timing and partial discharge signal acquisition of different nodes, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0060] Optionally, the real-time temperature value is obtained at a preset time interval and fed back to the host, so that the host obtains the temperature difference and the temperature change rate according to the real-time temperature value and the preset time interval, so that the host obtains the difference judgment result based on the temperature difference and the preset difference range and obtains the change judgment result based on the temperature change rate and the preset change range, and then the host sends a synchronous timing invalid instruction based on the difference judgment result and the change judgment result; and responds to the synchronous timing invalid instruction and stops collecting partial discharge signals based on the synchronous timing invalid instruction.

[0061] Optionally, this embodiment also provides a discharge detection method based on constant temperature crystal oscillator temperature control, which is applied to the host node, see Figure 2 , including the following steps:

[0062] Send the target temperature value to the slave node so that the slave starts to obtain the original temperature value, and then the slave performs the temperature control operation based on the original temperature value and the target temperature value, and the slave obtains the current temperature value in real time, and feeds back a temperature control success signal when the current temperature value meets the preset steady-state condition;

[0063] Obtain its own temperature value and perform host temperature control operations based on the target temperature value;

[0064] In response to the temperature control success signal, after the temperature control operation of the host is completed, the synchronous timing is started, and the synchronous timing signal is sent to the slave, so that the slave performs the synchronous timing based on the synchronous timing signal, and then the slave feeds back the completion timing signal after the synchronous timing;

[0065] In response to the completion of the timing signal, after the timing lock is completed, the partial discharge signal is collected, and a signal collection instruction is sent to the slave, so that the slave collects the partial discharge signal based on the signal collection instruction, and then obtains the location of the partial discharge based on the partial discharge signal.

[0066] Optionally, real-time temperature values ​​from the slave are obtained at preset time intervals to obtain the temperature difference and the temperature change rate based on the real-time temperature values ​​and the preset time intervals; a difference judgment result is obtained based on the temperature difference and the preset difference range, and a change judgment result is obtained based on the temperature change rate and the preset change range; and a synchronization timing invalidation instruction is sent based on the difference judgment result and the change judgment result, so that the slave stops collecting partial discharge signals based on the synchronization timing invalidation instruction.

[0067] Optionally, the temperature difference and temperature change rate are obtained based on the real-time temperature value and the preset time interval. The specific calculation process is as follows:

[0068] ΔT=|T m -T s

[0069]

[0070] Where: ΔT is the temperature difference, T m is the real-time temperature value, T s is the corresponding temperature value, k is the temperature change rate, t n and t 0 Indicates two different times, T n t n The real-time temperature value at the moment, T 0 t 0 Real-time temperature value at the moment.

[0071] In the specific implementation process, the synchronous timing execution needs to rely on a constant temperature crystal oscillator to maintain a constant temperature to ensure the timing accuracy. When the temperature of the environment in which the constant temperature crystal oscillator is located changes greatly or the temperature difference of the external environment is too large, the fixed frequency signal it generates is very easy to fluctuate, resulting in excessive timing error controlled by it. Therefore, after working for a period of time, it is necessary to determine whether the current timing error meets the positioning requirements based on the difference in the internal temperature of the host and slave nodes and the change trend within a certain period of time. The specific determination method is as follows: After starting work, the slave node sends the current internal temperature value to the host in real time at a fixed preset time interval. If the present invention is set to a 1s time interval, after the host node receives the real-time temperature value, it will determine whether the current synchronous timing signal is available based on the temperature difference between the two nodes and the temperature change rate of any node; assuming that the current host temperature is T m , the slave temperature is T s When the host receives the slave temperature, it uses the above values ​​to calculate the temperature difference, that is, ΔT = |T m -T s |, in the present invention, ΔT is set to 1°C; the temperature change rate calculation method can be found in Figure 3, Figure 4 The temperature change rate shown is

[0072] In the specific implementation process, it is stipulated that the temperature change in any node within 2s is 0.2°C. That is, when k>0.1, or ΔT>1°C, accurate timing cannot be performed, and thus partial discharge signal collection cannot be performed.

[0073] This embodiment realizes communication between the master and slave machines and the sending and execution of instructions through remote communication, and realizes synchronous temperature control operation, thereby ensuring the consistency and synchronization of the synchronous timing and partial discharge signal acquisition working environment of the master and slave machine nodes, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0074] Embodiment 2:

[0075] This embodiment provides a discharge detection system based on constant temperature crystal oscillator temperature control, including a plurality of slave nodes and a host node.

[0076] Optionally, in the present embodiment, a discharge detection system based on constant temperature crystal oscillator temperature control is provided, wherein the slave node includes:

[0077] The main control module is used to communicate with the host and control the start-up of the temperature monitoring module, the synchronous timing module and the data acquisition module;

[0078] The temperature monitoring module is used to receive the target temperature value from the host, obtain the original temperature value and feed it back to the host, and perform the slave temperature control operation based on the original temperature value and the target temperature value, and obtain the current temperature value in real time, and when the current temperature value meets the preset steady-state condition, send a temperature control success signal to the host, so that the host sends a synchronous timing signal based on the temperature control success signal;

[0079] A synchronous timing module, used for executing synchronous timing in response to a synchronous timing signal, and sending a completion timing signal to the host, so that the host sends a signal acquisition instruction according to the completion timing signal;

[0080] The data acquisition module is used to collect partial discharge signals in response to the signal acquisition instruction and obtain the location of the partial discharge based on the partial discharge signals.

[0081] In the specific implementation process, the system structure proposed in this embodiment is simple and easy to implement. It realizes communication with the host and controls the startup of each module through the main control module. The modules realize remote communication and temperature control operations through coordination and cooperation to set and control the temperature, thereby ensuring the consistency of the internal temperature of the system, providing a working environment that is relatively consistent with the host for the slave synchronous timing module and the data acquisition module, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0082] Optionally, the temperature monitoring module includes: a temperature sensing submodule, used to obtain the original temperature value and the current temperature value in real time; a temperature control submodule, used to perform slave temperature control operations based on the original temperature value and the target temperature value; a signal transmission submodule, used to feed back the original temperature value to the host, and send a temperature control success signal to the host when the current temperature value meets the preset steady-state condition, so that the host sends a synchronization timing signal based on the temperature control success signal.

[0083] During the specific implementation process, the temperature monitoring module ensures temperature consistency among nodes through remote real-time communication.

[0084] Optionally, in the present embodiment, a discharge detection system based on constant temperature crystal oscillator temperature control is provided, wherein the host node includes:

[0085] The host control module is used to communicate with the slaves and control the start-up of the host temperature monitoring module, the host synchronous timing module and the host data acquisition module;

[0086] The host temperature monitoring module is used to send the target temperature value to the slave node so that the slave starts to obtain the original temperature value, and then the slave performs the temperature control operation based on the original temperature value and the target temperature value, and enables the slave to obtain the current temperature value in real time, and feedback the temperature control success signal when the current temperature value meets the preset steady-state condition, and obtain its own temperature value and perform the host temperature control operation based on the target temperature value;

[0087] The host synchronous timing module is used to respond to the temperature control success signal, and start the synchronous timing after the host temperature control operation is completed, and send the synchronous timing signal to the slave, so that the slave performs the synchronous timing based on the synchronous timing signal, and then the slave feeds back the completion timing signal after the synchronous timing;

[0088] The host data acquisition module is used to respond to the completion timing signal, and start collecting partial discharge signals after completing the timing lock, and send a signal acquisition instruction to the slave, so that the slave collects the partial discharge signal based on the signal acquisition instruction, and then obtains the location of the partial discharge based on the partial discharge signal.

[0089] During the specific implementation process, the system provided in this embodiment communicates with the slave machine, sends instructions and controls the startup of each module of the host machine through the host main control module, and realizes the temperature setting and regulation of the master and slave machine nodes through remote communication and coordination and cooperation and temperature control operations between modules, thereby ensuring the consistency of the internal temperature of the system, providing a more consistent working environment for the master and slave machine synchronous timing modules and data acquisition modules, and effectively improving the accuracy of synchronous timing and partial discharge positioning.

[0090] Optionally, the host temperature monitoring module also includes an effective monitoring sub-module, which is used to obtain real-time temperature values ​​from the slave machine at preset time intervals, to obtain temperature difference and temperature change rate based on the real-time temperature value and the preset time interval, and to obtain a difference judgment result based on the temperature difference and the preset difference range, and to obtain a change judgment result based on the temperature change rate and the preset change range, thereby sending a synchronous timing invalid instruction based on the difference judgment result and the change judgment result, so that the slave machine stops collecting partial discharge signals based on the synchronous timing invalid instruction.

[0091] In the specific implementation process, through the effective monitoring sub-module, two key judgment factors, temperature difference and change rate, are added each time partial discharge positioning is carried out to confirm whether positioning can be carried out and provide positioning accuracy.

[0092] This embodiment provides a discharge detection system based on constant temperature crystal oscillator temperature control, which sets a host and several slave nodes, and combines with the modules in the nodes to form a two-level temperature control system, so as to realize the communication of temperature data between multiple nodes, realize the temperature synchronization of multiple timing nodes, solve the influence of external temperature, ventilation and other conditions on the timing accuracy, and ensure that the signals synchronously collected by the system belong to the same pulse signal caused by partial discharge, thereby improving the accuracy of partial discharge positioning.

[0093] Embodiment three:

[0094] This embodiment provides a discharge detection device based on constant temperature crystal oscillator temperature control, which is used to implement a discharge detection method based on constant temperature crystal oscillator temperature control as provided in the first embodiment, and is applied to a host or slave node, see Figure 4 The device includes a main control chip, a temperature sensor, a temperature control module, a constant temperature crystal oscillator, a timing module, a data acquisition module, a heat preservation shell, a sensor interface and a communication antenna.

[0095] Optionally, the temperature sensor and the temperature control module are combined to form a temperature monitoring module; the constant temperature crystal oscillator and the timing module are combined to form a synchronous timing module, and the constant temperature crystal oscillator and the timing module cooperate to achieve the acquisition of the second pulse signal.

[0096] In the specific implementation process, the outermost side of the device is a sealed insulating outer shell, which is filled with a certain thickness of insulating material to achieve temperature isolation between the inside and outside of the shell, while helping the internal temperature control module to control the internal temperature.

[0097] In the specific implementation process, the main control chip needs to have the following functions: (1) Transmit the temperature value measured by the temperature monitoring module to other devices through the communication antenna, and receive the temperature of other devices for comparison with the temperature inside the device. In order to achieve long-distance communication, this communication method can be set to Bluetooth, WiFi, ZigBee, etc. in an open space. When the distance between different positioning nodes is far and the above communication methods cannot be achieved, mobile communication networks can be used for communication to achieve long-distance data transmission. (2) Control the startup sequence of each module, that is, after the device is powered on, realize the startup sequence control of each internal unit to ensure the effectiveness of the device.

[0098] During the specific implementation process, the temperature control module has the following functions: connected to the temperature sensor inside the device to read the ambient temperature inside the device. At the same time, the temperature control module has a built-in computing chip, which cooperates with the heating unit in the module to achieve stable control of the temperature inside the device and transmit the temperature value to the main control module.

[0099] In the specific implementation process, the data acquisition module uses the second pulse as the trigger signal to record the partial discharge signal within 20ms.

[0100] In the specific implementation process, in order to determine whether the pulse signals synchronously collected at both ends of the cable belong to the same pulse signal caused by partial discharge, the matching signal pair is determined by signal correlation analysis. Figure 5 The specific working process of the device is as follows:

[0101] The device is turned on;

[0102] Node communication, the host node transmits the target temperature value to the slave node;

[0103] The host and slave nodes feedback the current temperature value and perform temperature control operations;

[0104] After the slave temperature control operation is completed, the slave node sends a temperature control success signal to the host;

[0105] The host node sends a synchronization timing signal based on the temperature control success signal and after determining that the host temperature control operation is completed;

[0106] The host and slave nodes turn on the constant temperature crystal oscillator and timing module based on the main control chip to perform synchronous timing;

[0107] After the slave node completes the timing, it sends a timing completion signal to the master node;

[0108] The host node sends a signal collection instruction after confirming that the synchronization timing is completed;

[0109] The host and slave nodes start collecting partial discharge signals based on the signal collection instructions;

[0110] The location of the partial discharge is determined based on the partial discharge signal.

[0111] In the specific implementation process, take the installation method of one host and one slave as an example, see Figure 6 , the host node and the slave node are equipped with sensors 1 and 2 respectively, located at both ends of the cable, and the device of this embodiment is installed in the host node and the slave node respectively: first, the device is powered on, and the two nodes start to communicate after power-on, and all instructions are sent by the host control; first, the host node sends the temperature value T to be set to the slave node via the communication antenna; after the slave receives the set value T, it returns its current temperature value T0 to the host, and starts to adjust the internal temperature of the device, with the target temperature being T; then it waits for the required time for temperature control of each node. After the slave node completes temperature control and reaches a steady state, it sends a temperature control success signal to the host. After the host receives the signal and completes its own internal temperature control, the host sends a start timing signal to the slave node, synchronously turns on its own constant temperature crystal oscillator and timing module, and starts synchronous timing. After receiving the signal, the slave turns on the internal constant temperature crystal oscillator and timing module to start synchronous timing; after the slave completes synchronous timing and locks the internal clock, it sends a completed timing signal to the host. After the host receives the signal and completes the timing lock itself, it sends a start partial discharge signal acquisition instruction to the slave. After that, the host and the slave start waiting for the arrival of the next second pulse, and start collecting signals after the arrival of the next second pulse, thereby completing partial discharge based on the collected signals.

[0112] The discharge detection device based on constant temperature crystal oscillator temperature control provided in this embodiment can be applied to host and slave nodes. By placing a secondary temperature control device in the device and establishing a temperature data communication module, the temperature synchronization of multiple timing nodes is achieved, the influence of external temperature, ventilation and other conditions on the timing accuracy is solved, and the timing accuracy is improved.

[0113] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A discharge detection method based on constant temperature crystal oscillator temperature control, characterized in that: The method is applied to a slave node and includes the following steps: Receive the target temperature value from the host, obtain the original temperature value and feed it back to the host, and perform the slave temperature control operation based on the original temperature value and the target temperature value; Acquire the current temperature value in real time, and send a temperature control success signal to the host when the current temperature value meets the preset steady-state condition, so that the host sends a synchronous timing signal based on the temperature control success signal; In response to the synchronous timing signal, synchronous timing is performed, and a completion timing signal is sent to the host, so that the host sends a signal acquisition instruction according to the completion timing signal; In response to the signal collection instruction, the partial discharge signal is collected and the location of the partial discharge is obtained based on the partial discharge signal.

2. A discharge detection method based on constant temperature crystal oscillator temperature control according to claim 1, characterized in that: Also includes: The real-time temperature value is obtained according to the preset time interval and fed back to the host, so that the host obtains the temperature difference and the temperature change rate according to the real-time temperature value and the preset time interval, so that the host obtains the difference judgment result based on the temperature difference and the preset difference range and obtains the change judgment result based on the temperature change rate and the preset change range, and then the host sends a synchronous timing invalidation instruction based on the difference judgment result and the change judgment result; Responding to the synchronous timing invalid instruction, and stopping collecting partial discharge signals based on the synchronous timing invalid instruction.

3. A discharge detection method based on constant temperature crystal oscillator temperature control, characterized in that: The method is applied to a host node and comprises the following steps: Send the target temperature value to the slave node so that the slave starts to obtain the original temperature value, and then the slave performs the temperature control operation based on the original temperature value and the target temperature value, and the slave obtains the current temperature value in real time, and feeds back a temperature control success signal when the current temperature value meets the preset steady-state condition; Obtain its own temperature value and perform host temperature control operations based on the target temperature value; In response to the temperature control success signal, after the temperature control operation of the host is completed, the synchronous timing is started, and the synchronous timing signal is sent to the slave, so that the slave performs the synchronous timing based on the synchronous timing signal, and then the slave feeds back the completion timing signal after the synchronous timing; In response to the completion of the timing signal, after the timing lock is completed, the partial discharge signal is collected, and a signal collection instruction is sent to the slave, so that the slave collects the partial discharge signal based on the signal collection instruction, and then obtains the location of the partial discharge based on the partial discharge signal.

4. A discharge detection method based on constant temperature crystal oscillator temperature control according to claim 3, characterized in that: Also includes: Acquire a real-time temperature value from the slave at a preset time interval, so as to acquire a temperature difference and a temperature change rate based on the real-time temperature value and the preset time interval; Obtaining a difference judgment result based on the temperature difference and a preset difference range, and obtaining a change judgment result based on the temperature change rate and a preset change range; A synchronous timing invalid instruction is sent based on the difference judgment result and the change judgment result, so that the slave stops collecting partial discharge signals based on the synchronous timing invalid instruction.

5. A discharge detection method based on constant temperature crystal oscillator temperature control according to claim 4, characterized in that: The method of obtaining the temperature difference and the temperature change rate based on the real-time temperature value and the preset time interval includes: ΔT=|T m -T s | Where: ΔT is the temperature difference, T m is the real-time temperature value, T s is the corresponding temperature value, k is the temperature change rate, t n and t0 represent two different times, T n t n T0 is the real-time temperature value at time t0.

6. A discharge detection system based on constant temperature crystal oscillator temperature control, characterized in that: include: Several slave nodes and master nodes; among them: The slave node is used to implement a discharge detection control method based on constant temperature crystal oscillator temperature control as described in any one of claims 1 to 2; The host node is used to implement a discharge detection method based on constant temperature crystal oscillator temperature control as described in any one of claims 3 to 5.

7. A discharge detection system based on constant temperature crystal oscillator temperature control according to claim 6, characterized in that: The slave node comprises: The main control module is used to communicate with the host and control the start-up of the temperature monitoring module, the synchronous timing module and the data acquisition module; The temperature monitoring module is used to receive the target temperature value from the host, obtain the original temperature value and feed it back to the host, and perform the slave temperature control operation based on the original temperature value and the target temperature value, and obtain the current temperature value in real time, and when the current temperature value meets the preset steady-state condition, send a temperature control success signal to the host, so that the host sends a synchronous timing signal based on the temperature control success signal; A synchronous timing module, used for executing synchronous timing in response to a synchronous timing signal, and sending a completion timing signal to the host, so that the host sends a signal acquisition instruction according to the completion timing signal; The data acquisition module is used to collect partial discharge signals in response to the signal acquisition instruction and obtain the location of the partial discharge based on the partial discharge signals.

8. A discharge detection system based on constant temperature crystal oscillator temperature control according to claim 7, characterized in that: The temperature monitoring module is used to receive the target temperature value from the host, obtain the original temperature value and feed it back to the host, and perform the slave temperature control operation based on the original temperature value and the target temperature value, and obtain the current temperature value in real time, and send a temperature control success signal to the host when the current temperature value meets the preset steady-state condition, so that the host sends a synchronous timing signal based on the temperature control success signal, including: The temperature sensor submodule is used to obtain the original temperature value and the current temperature value in real time; The temperature control submodule is used to perform the slave temperature control operation based on the original temperature value and the target temperature value; The signal transmission submodule is used to feed back the original temperature value to the host, and to send a temperature control success signal to the host when the current temperature value meets the preset steady-state condition, so that the host can send a synchronous timing signal based on the temperature control success signal.

9. A discharge detection system based on constant temperature crystal oscillator temperature control according to claim 6, characterized in that: The host node comprises: The host control module is used to communicate with the slaves and control the start-up of the host temperature monitoring module, the host synchronous timing module and the host data acquisition module; The host temperature monitoring module is used to send the target temperature value to the slave node so that the slave starts to obtain the original temperature value, and then the slave performs the temperature control operation based on the original temperature value and the target temperature value, and enables the slave to obtain the current temperature value in real time, and feedback the temperature control success signal when the current temperature value meets the preset steady-state condition, and obtain its own temperature value and perform the host temperature control operation based on the target temperature value; The host synchronous timing module is used to respond to the temperature control success signal, and start the synchronous timing after the host temperature control operation is completed, and send the synchronous timing signal to the slave, so that the slave performs the synchronous timing based on the synchronous timing signal, and then the slave feeds back the completion timing signal after the synchronous timing; The host data acquisition module is used to respond to the completion timing signal, and start collecting partial discharge signals after completing the timing lock, and send a signal acquisition instruction to the slave, so that the slave collects the partial discharge signal based on the signal acquisition instruction, and then obtains the location of the partial discharge based on the partial discharge signal.

10. A discharge detection system based on constant temperature crystal oscillator temperature control according to claim 9, characterized in that: The host temperature monitoring module also includes: an effective monitoring submodule, which is used to obtain real-time temperature values ​​from the slave machine at preset time intervals, to obtain temperature differences and temperature change rates based on the real-time temperature values ​​and the preset time intervals, and to obtain difference judgment results based on the temperature difference and the preset difference range, and to obtain change judgment results based on the temperature change rate and the preset change range, thereby sending a synchronous timing invalidation instruction based on the difference judgment result and the change judgment result, so that the slave machine stops collecting partial discharge signals based on the synchronous timing invalidation instruction.

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