Alarm device and alarm method for an electrical device

Abstract

The application discloses an alarm device and method of power equipment, and particularly relates to the field of power equipment alarm, which comprises a sampling channel connected between a power supply inlet of a cabinet alarm and a backflow path of the cabinet and connected with an edge of an external alarm component of a cabinet door, used for obtaining the instantaneous potential of the power supply inlet relative to the backflow path, calculating the adjacent sampling symbol flip amount, generating a fault observation sequence and driving an audible and visual alarm; performing online change point detection on the fault observation sequence, respectively recursively connecting path values and restarting path values with the local observation difference and the local recalculation amount; forming a fault observation sequence by performing sequential sampling on the edge potential between the power supply inlet of the alarm and the backflow path of the cabinet, determining the starting point of the abnormal condition by using the online change point detection, and determining the remaining sampling section of wireless transmission by using hidden semi-Markov decoding, so that the alarm device constructs a short-time message before power supply drop and completes wireless networking relay confirmation by adjacent cabinet alarm devices.

Description

Technical Field

[0001] This invention relates to the field of power equipment alarm technology, and more specifically, to an alarm device and alarm method for power equipment. Background Technology

[0002] In the operation alarm processing of switchgear and power cabinet, the existing processing is mostly focused on timely prompting of abnormalities in the cabinet and remote reception. Generally, abnormal signals are collected by temperature, smoke, arc light, partial discharge or access control detection devices, and then the alarm is driven by the sound and light prompts. The alarm information is sent to the centralized monitoring terminal or adjacent cabinets through wireless communication nodes. In the scenario of installing alarms in rows of high and low voltage switchgear, the alarm devices are mostly installed inside the cabinet or near the cabinet door. The cabinet structure should not have large openings or cross-cabinet wiring due to the alarm function. When a short circuit, terminal burn-out, arc flashover or control power drop occurs inside the cabinet, the power supply of the alarm device, the status of the secondary circuit and the wireless transmission conditions will be impacted at the same time. This can easily lead to a situation where on-site verification is possible: when the alarm is normal in terms of heartbeat, test button and local sound and light prompts, after the source cabinet fails, the node goes offline, communication times out or only an incomplete alarm segment is sent. The adjacent cabinets fail to receive the valid alarm information carrying the source cabinet number. The centralized monitoring terminal can only record the communication interruption and cannot identify the faulty source cabinet in the first time. The technical problem this application aims to solve is: how to enable the source cabinet alarm to send alarm information that can be received and relayed by adjacent cabinets when a switch cabinet or power cabinet source cabinet fails and is accompanied by power supply drop, electromagnetic disturbance and deterioration of wireless transmission conditions. Summary of the Invention

[0003] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide an alarm device and alarm method for power equipment. By performing sequential sampling of the edge potential between the power supply inlet of the alarm device and the return path of the cabinet to form a fault observation sequence, online change point detection is used to determine the starting point of the abnormal situation, and hidden semi-Markov decoding is used to determine the remaining sampling segment of wireless transmission. This enables the alarm device to construct a short-term message before the power supply drops and the alarm device in the adjacent cabinet to complete the wireless network relay confirmation, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an alarm device for power equipment, comprising: The edge sampling alarm module includes an edge sampling channel connected between the power supply inlet of the cabinet alarm and the cabinet return path and connected to the external display alarm component of the cabinet door. It is used to obtain the instantaneous potential of the power supply inlet relative to the return path, calculate the sign flipping amount of adjacent sampling bits, generate a fault observation sequence, and drive the audible and visual alarm. The online change point detection module is used to perform online change point detection on the fault observation sequence. It recursively derives the receiving path value and the restart path value based on the local observation difference and the local recalculation value, respectively, and outputs the sampling bit at the beginning of the same path of the restart path value as the starting point of the abnormal situation. The hidden half-Markov decoding module is used to perform hidden half-Markov decoding on the fault observation sequence with the starting point of the abnormal situation as the starting bit. This enables the power supply status to change from holding through a drop to alarm pre-launch and then to the risk of loss of sound. It performs forward recursion and reverse backtracking according to the number of sampling bits at the state stop, and outputs the remaining sampling segments for wireless transmission. The short-time message wireless transmission module includes a power supply channel pre-charged by the alarm power supply inlet and triggered by the start position of the remaining sampling segment of wireless transmission, and a wireless transmitter. It is used to distribute and transmit power within the remaining sampling segment of wireless transmission, convert the cabinet address into the source cabinet location code, and write the abnormal situation start point and the remaining sampling segment of wireless transmission into a short-time message.

[0005] In a preferred embodiment, it further includes: The wireless networking relay module is used to confirm wireless networking after the alarm device of the adjacent cabinet receives a short message. It generates the cabinet row adjacency result from the source cabinet location code and the current cabinet location code, generates the sequence result from the abnormal situation starting point and the received sampling position, and generates the margin result by subtracting the arrived consumed sampling segment from the remaining sampling segment of wireless transmission. After all three results are true, it sends the networking alarm information to the centralized monitoring terminal.

[0006] In a preferred embodiment, the edge sampling alarm module includes: Using the alarm power supply inlet of the alarm device as the sampling start point and the cabinet return path as the sampling reference point, the instantaneous potential of the power supply inlet relative to the return path is sequentially sampled through the edge sampling channel, and the instantaneous potential of each sampling point is bound with the sampling point number, and the potential record of this point is output. Read the local potential record, perform sign function to obtain the instantaneous potential of adjacent sampling bits, where the sampling bit with zero instantaneous potential adopts the sign value of the previous non-zero sampling bit, multiply the two adjacent sign values ​​to form the sign inheritance result, and generate the sign flip amount when the sign inheritance result changes from positive product inheritance to negative product inheritance, and then write the sign flip amount into the fault observation sequence according to the sampling bit number; Based on the sampling bit of the currently written symbol flip value in the fault observation sequence, the cabinet door external display alarm device is activated, so that the cabinet door external display alarm device carries the corresponding sampling bit sequence number in the local audible and visual alarm action and outputs the fault observation sequence.

[0007] In a preferred embodiment, the online change point detection module includes: Online change point detection is performed on the fault observation sequence. The current sampling position in the fault observation sequence is taken as the local sampling position. The local observation difference is generated by subtracting the symbol flip value of the previous sampling position from the symbol flip value of the local sampling position. The running length of the previous sampling position is added by one and multiplied by the absolute value of the local observation difference to form the successor path value.

[0008] In a preferred embodiment, the online change point detection module further includes: For the local sampling position, the local sampling position number is written into the restart flag, the absolute value of the local observation difference is multiplied by the number of sampling positions between the local sampling position and the detection start position to form the restart path value, and the receiving path value and the restart path value are written into the local path table. The candidate path for this position is determined in descending order of the path value. When the restart path value is at the top of the candidate path for this position and the recalculation mark points to the sample position for this position, the sample position for this position is output as the starting point of the abnormal situation, and the starting point of the abnormal situation is written into the abnormal situation record of the alarm device.

[0009] In a preferred embodiment, the hidden semi-Markov decoding module includes: Using the abnormal situation as the starting point of the hidden semi-Markov decoding, the symbol flip value is read from the fault observation sequence according to the sampling order, so that the power supply status grid is sequentially changed from the power supply holding state to the power supply drop state, then to the alarm preemptive state and terminated in the silence risk state. The observation cost of each status grid is generated by the difference between the current sampling bit number, the current state remaining sampling bit number and the symbol flip value of this bit relative to the symbol inheritance result of the previous grid, and the status grid record is output.

[0010] In a preferred embodiment, the hidden semi-Markov decoding module further includes: Within the state grid record, a forward recursion is performed on each sample bit, causing the path that remains in the current state to increment the number of state-remaining sample bits by one, and causing the path to enter the next state to be connected along the predetermined transition direction of the power supply state grid. The observation cost is multiplied by the number of state-remaining sample bits and then accumulated to obtain the path cumulative cost. The path with the sorting number of one and its predecessor pointer are retained in ascending order of the path cumulative cost, and the restricted path table is output. From the state of silence risk, the sampling position is traced back along the preceding pointer to the state of alarm preemptive firing. The sampling segment between the two sampling positions is determined as the remaining sampling segment for wireless transmission, and the remaining sampling segment for wireless transmission is written into the alarm device's preemptive firing control record.

[0011] In a preferred embodiment, the short-time message wireless transmission module includes: The starting bit of the remaining sampling segment of wireless transmission is used as the power supply channel release trigger bit. The number of remaining sampling bits is generated by subtracting the starting bit number from the ending bit number of the remaining sampling segment and adding one. The number of fixed loading bits of the short message is then subtracted from the number of remaining sampling bits to generate the transmission margin segment. Power is allocated to the wireless transmitter in the order of each sampling bit in the transmission margin segment, and the wireless transmission start record is output. Read the cabinet address, convert the cabinet address into the source cabinet location code according to the cabinet column order, generate the starting distance code by the bit order difference between the starting point of the abnormal situation and the starting point of the remaining sampling segment of the wireless transmission, and concatenate the source cabinet location code as the field header and the starting distance code as the field tail to generate the source cabinet preemptive transmission field. Within the transmission margin segment, the source cabinet's preemptive transmission field is written into the short message start segment, the remaining sampling bits are written into the short message check segment, and the writing order from the short message start segment to the short message check segment drives the wireless transmitter to perform wireless transmission to the alarm device of the adjacent cabinet, outputting the short message transmission record.

[0012] In a preferred embodiment, the wireless networking relay module includes: After the alarm device of the adjacent cabinet receives the short message, it performs wireless networking confirmation reading on the short message. First, the source cabinet location code is restored from the short message start segment, and then the remaining sampling bits are restored from the short message check segment. The arrival consumption sampling segment is generated by subtracting the first arrival sampling bit of the short message from the sampling bits received by this cabinet. Subtract the location code of this cabinet from the location code of the source cabinet and take the absolute value. When the difference is equal to one, generate the cabinet column adjacency result; subtract the starting point of the abnormal situation from the received sampling bits of this cabinet to generate the sequential bit difference. When the sequential bit difference is a positive integer, generate the sequential result; subtract the arrival consumption sampling segment from the remaining sampling bits to generate the transmission margin. When the transmission margin is a positive integer, generate the margin result. After the adjacent cabinet results are written into the relay record of this cabinet, the sequential results and the remaining results are written in sequence. The source cabinet location code forms the source segment of the network alarm information, the location code of this cabinet forms the relay segment of the network alarm information, the abnormal situation starting point forms the timing segment of the network alarm information, and the transmission remaining amount forms the remaining segment of the network alarm information. The alarm information is then wirelessly transmitted to the centralized monitoring terminal through the adjacent cabinet alarm device.

[0013] An alarm method for electrical equipment, the method comprising: S1. Obtain the instantaneous potential of the power supply inlet relative to the return path, calculate the sign flip of adjacent sampling bits, generate a fault observation sequence, and drive the audible and visual alarm. S2. Perform online change point detection on the fault observation sequence, and recursively deduce the receiving path value and restart path value based on the local observation difference and local recalculation value, respectively. Output the sampling bit with the restart path value at the first position of the same path as the starting point of the abnormal situation. S3. Using the starting point of the abnormal situation as the starting bit, perform hidden semi-Markov decoding on the fault observation sequence to make the power supply status change from holding through drop to alarm pre-launch and then to the risk of silence. Perform forward recursion and reverse backtracking according to the number of sampling bits of the status, and output the remaining sampling segments of wireless transmission. S4. Allocate power for transmission within the remaining sampling segment of wireless transmission, convert the cabinet address into the source cabinet location code, and write the abnormal situation starting point and the remaining sampling segment of wireless transmission into a short message. S5. After receiving a short message, the alarm device of the adjacent cabinet confirms the wireless networking. It generates the cabinet row adjacency result from the source cabinet location code and the location code of this cabinet. It generates the sequence result from the starting point of the abnormal situation and the received sampling position. It generates the margin result by subtracting the arrived consumption sampling segment from the remaining sampling segment of the wireless transmission. After all three results are true, it sends the networking alarm information to the centralized monitoring terminal.

[0014] The technical effects and advantages of this invention are as follows: 1. This solution triggers short-term message transmission by wirelessly transmitting the remaining sampling segment, enabling the source cabinet to complete the preemptive transmission before the power supply drops, thereby relatively reducing the risk of missed reports caused by the source cabinet losing its sound. 2. Use online change point detection to output the starting point of abnormal conditions, so that the alarm trigger position has a sampling point basis, reducing the uncertainty of judging the fault source cabinet based solely on offline nodes; 3. In the hidden semi-Markov decoding, identify the sampling segment where alarms are preemptively sent and there is a risk of loss of sound, so as to maintain the priority of power supply service and send short-term messages, thereby improving the transmission timing at the moment of failure; 4. Construct a short message using the source cabinet location code, starting point distance code, and remaining sampling bits to enable adjacent cabinets to reconstruct the source cabinet location and abnormal starting point, thereby enhancing the basis for relay confirmation; 5. Perform joint writing on the cabinet row adjacency results, sequence results and margin results to enable wireless network transmission to have position, timing and margin verification, and suppress false relay reporting. 6. Write the sampling position number into the alarm action displayed on the cabinet door to ensure that the local audible and visual alarm corresponds with the fault observation sequence, which facilitates on-site verification of the alarm triggering process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the device module structure of the present invention; Figure 2 This is a flowchart outlining the method steps of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Refer to the instruction manual appendix Figure 1-2 An alarm device for power equipment according to the present invention includes: The edge sampling alarm module includes an edge sampling channel connected between the power supply inlet of the cabinet alarm and the cabinet return path and connected to the external display alarm component of the cabinet door. It is used to obtain the instantaneous potential of the power supply inlet relative to the return path, calculate the sign flipping amount of adjacent sampling bits, generate a fault observation sequence, and drive the audible and visual alarm. This implementation method is used to organize the instantaneous potential of the alarm power supply inlet relative to the cabinet return path into a fault observation sequence with a unified sampling reference before the alarm device enters the online change point detection. Its working mechanism is as follows: using the alarm power supply inlet as the sampling start point and the cabinet return path as the sampling reference point, the sampling potential has a clear reference. The sampling order is maintained by the sampling bit number, and the potential reversal position is identified by the sign function value and the sign reception result. The sign reversal amount, sampling bit number, and sign reception result are written into the same fault observation sequence for the online change point detection module to read. This implementation process includes the following steps: The alarm device uses the power supply inlet of the alarm as the sampling start point and the cabinet return path as the sampling reference point. The edge sampling channel obtains the instantaneous potential of the power supply inlet relative to the return path according to the local sampling rhythm of the alarm device. The alarm device assigns a sampling position number to each sampling position and binds the instantaneous potential with the sampling position number to write it into the local potential record, so that the local potential record simultaneously contains the sampling reference, the sampling position number, and the instantaneous potential. If the edge sampling channel does not obtain the instantaneous potential at the beginning of the monitoring cycle, the alarm device only retains the sampling position number and does not write it into the local potential record. After the edge sampling channel obtains the instantaneous potential, the local potential record is generated with the sampling position number that obtained the instantaneous potential to avoid null values ​​participating in the sign function value. After forming the local potential record, the alarm device reads the instantaneous potential of adjacent sampling bits and performs a sign function to obtain the value. When the instantaneous potential is positive, a positive value is written; when the instantaneous potential is negative, a negative value is written. When the instantaneous potential is zero and there is a non-zero sampling bit before the current sampling bit, the sign value of the non-zero sampling bit that comes first and is closest to the current sampling bit is used. If there is no non-zero sampling bit before the current sampling bit, the alarm device does not generate a sign inheritance result for the current sampling bit. The alarm device multiplies two adjacent sign values ​​to form a sign inheritance result. When the sign inheritance result changes from positive product inheritance to negative product inheritance, a sign flip value is generated, and the sign flip value along with the corresponding sampling bit number is written into the fault observation sequence. Sampling bits that do not generate a sign flip value are written into the sign inheritance result of this round, so that the fault observation sequence retains both the flipped position and the inheritance relationship of the unflipped sampling bits. When the fault observation sequence is written, the alarm device reads the sampling bit number of the current written symbol flip and generates the audible and visual action bit sequence code of the cabinet door external display alarm device based on the sampling bit number; the cabinet door external display alarm device outputs the local audible and visual alarm action according to the audible and visual action bit sequence code, so that the local audible and visual alarm action carries the sampling bit number where the symbol flip is located; each sampling bit corresponds to only one symbol flip writing and one audible and visual action bit sequence code generation, and the sampling bit that has already been written with the symbol flip will not trigger the audible and visual action bit sequence code again; after the fault observation sequence is completed and the current sampling bit is written, it is transmitted by the alarm device to the online change point detection module, so that the online change point detection module can calculate the local observation difference based on the same sampling bit number; This implementation method ensures consistency between the sampling source, symbol value, flip position, and alarm action of the fault observation sequence by using the same reference sampling between the power supply inlet of the alarm and the return path of the cabinet, binding the sampling bit sequence number, accepting the zero value symbol value, writing the symbol flip amount once, and encoding the audio-visual action bit sequence. This provides a clear input for the online change point detection module to calculate the starting point of the abnormal situation. In practical applications: When the alarm device of the high-voltage switchgear is installed inside the cabinet door, the power supply inlet of the alarm device is connected to the alarm power supply inside the cabinet, and the return path of the cabinet is connected to the grounding side of the cabinet. When terminal burning causes the instantaneous potential of the power supply inlet relative to the return path of the cabinet to flip between adjacent sampling positions, the alarm device writes the sampling position number and sign flip amount of the flipped position into the fault observation sequence, and causes the external alarm device of the cabinet door to output an audible and visual alarm according to the sampling position number. Subsequently, the fault observation sequence is read by the online change point detection module to generate the starting point of the abnormal situation.

[0018] The online change point detection module is used to perform online change point detection on the fault observation sequence. It recursively derives the receiving path value and the restart path value based on the local observation difference and the local recalculation value, respectively, and outputs the sampling bit at the beginning of the same path of the restart path value as the starting point of the abnormal situation. This implementation method is used to locate the starting point of an anomaly in the sampling sequence by the online change point detection module after the fault observation sequence has been formed by the edge sampling alarm module. Its working mechanism involves calculating the difference between the current sampling position and the previous sampling position in the fault observation sequence. A "continuing path" represents the possible path for the fault observation sequence to continue along its original running length, and a "restart path" represents the possible path for the fault observation sequence to restart from the current sampling position. Then, by sorting the path values ​​in the current path table and using the restart marker relationship, the starting point of the anomaly that can enter subsequent hidden semi-Markov decoding is determined. This implementation process includes the following steps: Using the current sampling bit in the fault observation sequence as the current sampling bit, the sequence write value corresponding to the current sampling bit is read from the fault observation sequence, and the sequence write value corresponding to the previous sampling bit is also read. The sequence write value corresponding to the current sampling bit is the sign flip value written by the current sampling bit. If the current sampling bit has not written a sign flip value, the sign continuation result written by the current sampling bit is read as a placeholder value. The sequence write value corresponding to the previous sampling bit is obtained according to the same rule. The current observation difference is generated by subtracting the sequence write value corresponding to the previous sampling bit from the sequence write value corresponding to the current sampling bit. The detection starting bit is the current sampling bit. The sampling position at the beginning of the fault observation sequence within the previous monitoring round has a running length equal to the cumulative number of sampling positions traversed by the receiving path from the detection starting position. When there is a previous sampling position at this sampling position, the running length of the previous sampling position is increased by one and multiplied by the absolute value of the observation difference at this position to form the receiving path value. The receiving path value and the current sampling position number are then written into the current sampling path table. When there is no previous sampling position at this sampling position, the detection starting position is used as the previous reference position for this sampling position, so that the current observation difference is recorded as zero, and the running length of this sampling position is recorded as one to prevent the starting sampling position from lacking a reference relationship. Based on the recalculation relationship of the current sampling position, the current sampling position number is written into the recalculation marker, and the number of sampling positions including endpoints between the current sampling position and the detection recalculation position is used as the number of restart sampling positions. The absolute value of the current observation difference is multiplied by the number of restart sampling positions to form the current recalculation value. The current recalculation value is then written into the path corresponding to the recalculation marker to form the restart path value. The receiving path value, restart path value, receiving path pointer, and recalculation marker are jointly written into the current path table, where the receiving path pointer points to the receiving path of the previous sampling position, and the recalculation marker points to the current sampling position. If the fault observation sequence does not have a valid sequence write value at the current sampling position, the receiving path value and restart path value are not updated. Only the current sampling position number is retained. It is written into the current path table after the current sampling position obtains the sign flip value or the sign receiving result. After the local path table is written, the accepting path values ​​and restarting path values ​​are sorted in descending order to form local candidate paths. The local candidate paths are determined by the path with a sorting number of one in the local path table. If the restarting path value corresponds to a sorting number of one, and the recalculation marker points to the local sampling position, the local sampling position is output as the starting point of the abnormal situation, and the starting point of the abnormal situation is written into the abnormal situation record of the alarm device. If the accepting path value corresponds to a sorting number of one, the running length of the previous sampling position is continued and the calculation of the next sampling position is entered, and no new abnormal situation starting point is written. If the accepting path value and the restarting path value are the same, the resolution is based on whether the accepting path pointer still points to the previous sampling position. If the accepting path pointer remains valid, the accepting path is continued. If the accepting path pointer is missing, the path corresponding to the recalculation marker is written, so that the abnormal situation record only receives the abnormal situation starting point with a clear path pointing to it. This implementation method uses the recursive relationship between local observation difference, running length, local recalculation amount, local path table and recalculation mark to enable the online change point detection module to generate anomaly starting point with sampling bit basis in the fault observation sequence, and write the anomaly starting point into the anomaly record of the alarm device for the hidden semi-Markov decoding module to read as the decoding starting point. In practical applications: After the switch cabinet alarm device forms a fault observation sequence within a monitoring cycle, the online change point detection module reads the symbol flip value or symbol continuation result bit by bit starting from the detection starting position; if the symbol flip value of the power supply inlet relative to the cabinet return path changes abruptly at a certain sampling position due to terminal burning, the restart path value obtains the sorting number as one in the local path table, and the recalculation mark points to the local sampling position. The alarm device then writes the local sampling position into the abnormal situation record. Subsequently, the hidden semi-Markov decoding module uses the abnormal situation starting point as the starting position to decode the remaining sampling segment of the wireless transmission.

[0019] The hidden half-Markov decoding module is used to perform hidden half-Markov decoding on the fault observation sequence with the starting point of the abnormal situation as the starting bit. This enables the power supply status to change from holding through a drop to alarm pre-launch and then to the risk of loss of sound. It performs forward recursion and reverse backtracking according to the number of sampling bits at the state stop, and outputs the remaining sampling segments for wireless transmission. This implementation method is used to extract the remaining sampling range capable of wireless transmission from the fault observation sequence by a hidden semi-Markov decoding module after the abnormal situation record of the alarm device has been written at the starting point of the abnormal situation. Its working mechanism is as follows: using the starting point of the abnormal situation as the starting bit of the hidden semi-Markov decoding, a power supply status grid is constructed under the same sampling bit sequence system. Then, through the transition to a restricted state, the recursion of the number of sampling bits for the state stay, and the backtracking of the predecessor pointer, the remaining sampling segment for wireless transmission between the alarm preemptive state entry sampling bit and the silent risk state entry sampling bit is determined. This implementation process includes the following steps: The system reads the starting point of the abnormal situation from the alarm device's abnormal situation record and uses it as the starting bit for hidden semi-Markov decoding. Then, it reads the symbol flip value of the current position from the fault observation sequence according to the sampling bit number. When the symbol flip value of the current sampling bit is not written, the symbol inheritance result corresponding to the current sampling bit is read as the placeholder value of the symbol flip value to avoid the status cell lacking observation input. The power supply status cell uses the sampling bit number and power supply status as the cell coordinates. The power supply status cell transitions from the power supply holding state to the power supply drop state, from the power supply drop state to the alarm preemptive state, and from the alarm preemptive state to the silence risk state. Reverse transitions and cross-level transitions are not written to the power supply status cell. Each status cell writes the current sampling bit number, the number of sampling bits in the current state, the position of the predecessor cell, and the observation cost. The observation cost is obtained by subtracting the symbol inheritance result of the previous cell from the symbol flip value of the current position and taking the absolute value. The symbol inheritance result of the previous cell comes from the symbol inheritance result of the sampling bit corresponding to the predecessor cell that has been written into the fault observation sequence. The status cell record is output. After the state grid record is formed, a forward recursion is performed on each sampling bit. Paths that are currently in the current state enter the current sampling bit along the current state, and the number of sampling bits in the current state is incremented by one. Paths that enter the next state enter the current sampling bit along the predetermined turning direction of the power supply state grid, and the number of sampling bits in the next state is recorded as one. The observation cost of the current state grid is multiplied by the number of sampling bits in the current state to obtain the cost of the current state grid. The cost of the current state grid is then added to the cumulative cost of the paths already formed in the predecessor grid to obtain the cumulative cost of the current path. When there are multiple entry paths for the same sampling bit, they are arranged in ascending order according to the cumulative cost of the paths. Paths with a sorting number of one and their predecessor pointers are retained. Paths that are not retained do not enter the next sampling bit recursion. A restricted path table is output, ensuring that the restricted path table only accepts paths that conform to the predetermined turning direction of the power supply state grid. After the restricted path table is written, the sampling position is traced back along the predecessor pointer from the silent risk state until the alarm preemptive state sampling position is reached. The alarm preemptive state sampling position is used as the start position of the remaining sampling segment of wireless transmission, and the silent risk state sampling position is used as the end position of the remaining sampling segment of wireless transmission. Both the start and end positions are included in the remaining sampling segment of wireless transmission. If the restricted path table has not yet formed a silent risk state sampling position at the end of the current monitoring round, the preset release end position of the power supply channel is read and used as the silent risk state sampling position. The preset release end position is jointly determined by the power supply channel capacity, the power consumption of a single sampling position of the wireless transmitter, and the fixed number of short-term message bits in the factory configuration of the alarm device. After the remaining sampling segment of wireless transmission is formed, the start position, end position, and corresponding sampling position number are written into the preemptive control record of the alarm device for the short-term message wireless transmission module to read. This implementation method uses progressive calculations between the abnormal situation starting point, power supply status grid, number of sampling bits for status stay, observation cost, path cumulative cost, and predecessor pointer to enable the hidden semi-Markov decoding module to convert the fault observation sequence into a wireless transmission remaining sampling segment with clear start and end points. Before the loss of sound risk state is entered, the preset release termination bit of the power supply channel is used to supplement the termination endpoint, thus avoiding the lack of preemptive control basis for the short-term message wireless transmission module. In practical applications: After the switch cabinet alarm device detects the starting point of an abnormal situation, the hidden semi-Markov decoding module continues to read the symbol flip value corresponding to the sampling bit number from the fault observation sequence. If the potential change of the power supply inlet relative to the cabinet return path first manifests as a symbol acceptance in the holding state, then enters the power supply drop state and switches to the alarm preemptive state, the restricted path table records the alarm preemptive state entering the sampling bit along the preceding pointer. When the silence risk state enters the sampling bit, the alarm device writes the alarm preemptive state entering the sampling bit to the silence risk state entering the sampling bit into the preemptive control record. The short-time message wireless transmission module then executes short-time message transmission within the remaining sampling segment of wireless transmission.

[0020] The short-term message wireless transmission module includes a power supply channel pre-charged by the alarm power supply inlet and triggered by the start position of the remaining sampling segment of wireless transmission, and a wireless transmitter. It is used to distribute and transmit power within the remaining sampling segment of wireless transmission, convert the cabinet address into the source cabinet location code, and write the abnormal situation start point and the remaining sampling segment of wireless transmission into a short-term message. This implementation method is used to prioritize the allocation of limited holding power to the short-time message transmission action after the hidden semi-Markov decoding module has output the remaining sampling segment of wireless transmission. Its working mechanism is as follows: the starting bit of the remaining sampling segment of wireless transmission triggers the release of the holding power channel; the remaining sampling bit number determines the range of sampling bits that the wireless transmitter can transmit; and the source cabinet location code, starting distance code, and remaining sampling bit number are written into the short-time message, enabling the adjacent cabinet alarm device to reconstruct the source cabinet location and the starting point of the abnormal situation after receiving the short-time message. This implementation process includes the following steps: The system reads the start and end bit numbers of the remaining sampling segment of the wireless transmission, uses the start bit as the hold power supply channel release trigger bit, and subtracts the start bit number from the end bit number and adds one to generate the remaining sampling bit number. The fixed loading bit number of the short-term message is formed by adding the number of sampling bits occupied by the short-term message start segment and the number of sampling bits occupied by the short-term message check segment. The number of sampling bits occupied by the short-term message start segment and the short-term message check segment is written into the factory configuration of the alarm device. The system generates a transmission margin segment by subtracting the fixed loading bit number of the short-term message from the remaining sampling bit number, and outputs transmission pulses to the wireless transmitter in the order of the sampling bit numbers in the transmission margin segment from front to back, forming a wireless transmission start record. If the remaining sampling bit number does not cover the fixed loading bit number of the short-term message, it is written into the insufficient transmission record, and only the hold power supply channel release trigger bit is reserved for the alarm device to perform local audible and visual alarm hold. After the wireless transmission start record is formed, the cabinet address is read and converted into the source cabinet location code according to the physical arrangement order of the cabinets. The physical arrangement order of the cabinets is written when the alarm device is installed, and it increases one cabinet at a time along the same cabinet direction, so that the alarm devices of adjacent cabinets can calculate the cabinet adjacency result based on the source cabinet location code and the location code of the current cabinet. Then, the abnormal situation start point and the start position of the remaining sampling segment of wireless transmission are read. The abnormal situation start point number is subtracted from the sequence number of the start position of the remaining sampling segment of wireless transmission to generate the start point distance code. The source cabinet location code is written into the field header and the start point distance code is written into the field tail. The source cabinet preemptive transmission field is generated by splicing them together. If the abnormal situation start point is not earlier than the start position of the remaining sampling segment of wireless transmission, the start point distance code is not generated, and the position sequence abnormal record is written to the preemptive transmission control record of the alarm device. After the source cabinet preemptive transmission field is completed, message loading is performed in the transmission reserve segment according to the writing order from the short message start segment to the short message check segment. The source cabinet preemptive transmission field is written into the short message start segment, the remaining sampling bits are written into the short message check segment, and the wireless transmitter performs wireless transmission to the alarm device of the adjacent cabinet in the writing order. Each time the wireless transmitter completes the transmission of the message bit corresponding to a sampling bit, it writes the corresponding sampling bit sequence number into the short message transmission record until the short message check segment is completed. If the transmission reserve segment ends before the short message check segment is completed, the sequence number of the already transmitted message bits and the ending sampling bit sequence number are written into the short message transmission record so that the alarm device of the adjacent cabinet can identify whether the short message has arrived completely. This implementation method uses a step-by-step calculation between the endpoint of the remaining sampling segment of wireless transmission, the fixed number of bits loaded in the short message, the transmission margin segment, the source cabinet location code and the starting distance code to enable the short message wireless transmission module to prioritize the transmission of the source cabinet preemptive field during the power supply channel release period, and to provide the wireless networking relay module with message fields that can restore the source cabinet location, the starting point of abnormal situations and the transmission margin. In practical applications: After a switch cabinet alarm device obtains the remaining sampling segment of wireless transmission through hidden semi-Markov decoding, the short-time message wireless transmission module triggers the release of the power supply channel with the start position of the remaining sampling segment and converts the cabinet address written in the cabinet row into the source cabinet location code. If the starting point of the abnormal situation is located before the start position of the remaining sampling segment of wireless transmission, the short-time message wireless transmission module writes the bit sequence difference between the two into a starting distance code, concatenates it with the source cabinet location code, and sends it to the alarm device of the adjacent cabinet. The alarm device of the adjacent cabinet then performs wireless networking confirmation based on the short-time message start segment and the short-time message check segment.

[0021] The wireless networking relay module is used to confirm wireless networking after the alarm device of the adjacent cabinet receives a short message. It generates the cabinet row adjacency result from the source cabinet location code and the cabinet location code, generates the sequence result from the abnormal situation starting point and the received sampling position, and generates the margin result by subtracting the arrived consumed sampling segment from the remaining sampling segment of wireless transmission. After all three results are true, it sends the networking alarm information to the centralized monitoring terminal. This implementation method is used to perform wireless network confirmation on the short message after the source cabinet alarm device has completed the short message wireless transmission. After confirming that the source cabinet location, the order of anomalies, and the transmission margin all have sampling bit basis, the network alarm information is sent to the centralized monitoring terminal. Its working mechanism is as follows: the adjacent cabinet alarm device first restores the source cabinet location code, starting distance code, and remaining sampling bit number from the short message, then performs cabinet column adjacency calculation between the source cabinet location code and the cabinet location code, performs order calculation between the starting point of the anomaly and the received sampling bits of the cabinet, performs margin calculation between the remaining sampling bit number and the arrived consumed sampling segment, and finally writes the three confirmation results into the cabinet relay record to form network alarm information. The implementation process includes the following steps: After receiving a short message, the adjacent cabinet alarm device first records the sampling bit of the first digit of the short message start segment arriving at its own cabinet, as the first digit arrival sampling bit of the short message. Then, it records the sampling bit of the short message check segment completed reading, as the received sampling bit of its own cabinet. The adjacent cabinet alarm device reads the short message start segment, restores the source cabinet location code from the field header of the source cabinet's preemptive transmission field, restores the starting distance code from the field tail of the source cabinet's preemptive transmission field, and subtracts the starting distance code from the first digit arrival sampling bit of the short message to generate the abnormal situation starting point mapped to the sampling bit reference of its own cabinet. Subsequently, the adjacent cabinet alarm device reads the short message check segment, restores the remaining sampling bit number, and subtracts the first digit arrival sampling bit of the short message from the received sampling bit of its own cabinet to generate the arrival consumption sampling segment. If the short message start segment or the short message check segment is not completed reading, the adjacent cabinet alarm device only writes a short message reception abnormality record and does not enter the cabinet column adjacency operation. After obtaining the wireless networking confirmation field, the adjacent cabinet alarm device subtracts its own cabinet location code from the source cabinet location code and takes the absolute value. When the difference equals one, it writes the cabinet row adjacency result. The own cabinet location code is written during installation based on the physical arrangement order of the cabinet rows. The difference between the location codes of adjacent alarm devices within the same cabinet row is one. Different cabinet rows are first excluded based on the cabinet row identifier before the difference calculation is performed. The adjacent cabinet alarm device then generates a sequence difference by subtracting the starting point of the abnormal situation from the received sampling bits of its own cabinet. When the sequence difference is a positive integer, it writes the sequence result. The adjacent cabinet alarm device then generates a transmission margin by subtracting the reached consumption sampling segment from the remaining sampling bits. When the transmission margin is a positive integer, it writes the margin result. If the cabinet row adjacency result, sequence result, or margin result is not written, the cabinet relay record remains incomplete, and the calculated field corresponding to the unwritten result is retained in the cabinet's received record for the centralized monitoring end to distinguish between non-adjacent messages, messages with invalid timing, and messages with insufficient margin. After the three confirmation results are completed, the adjacent cabinet alarm device first writes the cabinet row adjacency result into the cabinet relay record, and then writes the sequence result and the reserve result in sequence, so that the cabinet relay record is formed in the order of source cabinet location confirmation, reception sequence confirmation, and transmission reserve confirmation; the adjacent cabinet alarm device forms the source segment of the network alarm information with the source cabinet location code, forms the relay segment of the network alarm information with the cabinet location code, forms the timing segment of the network alarm information with the abnormal situation starting point, and forms the reserve segment of the network alarm information with the transmission reserve, and then performs wireless network transmission to the centralized monitoring terminal through the adjacent cabinet alarm device; after receiving the network alarm information, the centralized monitoring terminal determines the source cabinet according to the source segment, determines the relay cabinet according to the relay segment, records the abnormal situation starting point according to the timing segment, and records the short-term wireless transmission reserve according to the reserve segment; This implementation method restores the fields of the short message start segment and short message check segment, performs cabinet column adjacency calculation between the source cabinet location code and the local cabinet location code, performs sequential calculation between the abnormal situation start point and the local cabinet received sampling bits, and performs calculation between the remaining sampling bits and the remaining amount of the consumed sampling segment. This enables the wireless networking relay module to convert the source cabinet short message into networking alarm information with location basis, timing basis and transmission basis, thus preventing adjacent cabinet alarm devices from directly sending non-adjacent cabinet messages or messages with insufficient remaining amount. In practical applications: When the source cabinet alarm device in a row of switch cabinets sends a short message within the remaining sampling segment of wireless transmission, the alarm device of the adjacent cabinet on the right receives the short message, restores the source cabinet location code and starting distance code from the starting segment of the short message, and then restores the remaining sampling bit number from the short message check segment; when the difference between the source cabinet location code and the location code of this cabinet is equal to one, the sampling bit received by this cabinet is later than the starting point of the abnormal situation, and the remaining sampling bit number is still a positive integer after deducting the sampling segment reached, the adjacent cabinet alarm device writes this cabinet as a relay cabinet into the network alarm information and sends the network alarm information to the centralized monitoring terminal.

[0022] Furthermore, the present invention also includes an alarm method for electrical equipment, the method comprising: S1. Obtain the instantaneous potential of the power supply inlet relative to the return path, calculate the sign flip of adjacent sampling bits, generate a fault observation sequence, and drive the audible and visual alarm. S2. Perform online change point detection on the fault observation sequence, and recursively deduce the receiving path value and restart path value based on the local observation difference and local recalculation value, respectively. Output the sampling bit with the restart path value at the first position of the same path as the starting point of the abnormal situation. S3. Using the starting point of the abnormal situation as the starting bit, perform hidden semi-Markov decoding on the fault observation sequence to make the power supply status change from holding through drop to alarm pre-launch and then to the risk of silence. Perform forward recursion and reverse backtracking according to the number of sampling bits of the status, and output the remaining sampling segments of wireless transmission. S4. Allocate power for transmission within the remaining sampling segment of wireless transmission, convert the cabinet address into the source cabinet location code, and write the abnormal situation starting point and the remaining sampling segment of wireless transmission into a short message. S5. After receiving a short message, the alarm device of the adjacent cabinet confirms the wireless networking. It generates the cabinet row adjacency result from the source cabinet location code and the location code of this cabinet. It generates the sequence result from the starting point of the abnormal situation and the received sampling position. It generates the margin result by subtracting the arrived consumption sampling segment from the remaining sampling segment of the wireless transmission. After all three results are true, it sends the networking alarm information to the centralized monitoring terminal.

[0023] Working Principle: This scheme first obtains the instantaneous potential of the alarm power supply inlet relative to the cabinet return path through the edge sampling alarm module, and reverses the signs of adjacent sampling positions to write a fault observation sequence. At the same time, it drives the external alarm display on the cabinet door to emit an audible and visual alarm. The online change point detection module continues to read the fault observation sequence, compares the successor path value and the restart path value, and determines the starting point of the abnormal situation. The hidden semi-Markov decoding module then uses the starting point of the abnormal situation as the starting position to determine the change process of the power supply status from holding, drop, alarm preemption to the risk of loss of sound, and solves the remaining sampling segment that can still perform wireless transmission. The short-time message wireless transmission module releases the holding power supply channel accordingly, writes the source cabinet location, the starting point of the abnormal situation, and the remaining transmission time into a short-time message and sends it. After receiving the short-time message, the alarm devices of adjacent cabinets complete the wireless networking confirmation, and then send the networking alarm information to the centralized monitoring terminal. When a row of switchgear or power cabinets is in operation, if a terminal burn-out, arc flash, or power supply inlet drop occurs in a cabinet, the source cabinet alarm device will first issue an on-site audible and visual alarm through the external alarm display on the cabinet door, and simultaneously send a short-term message before the power supply becomes unstable. After receiving the short-term message, the adjacent cabinet alarm devices will confirm whether they are adjacent based on the source cabinet location code, confirm the receiving order based on the starting point of the abnormal situation, and confirm whether there is still forwarding margin based on the remaining sampling bits. Once all three confirmations are successful, the device will report to the centralized monitoring terminal on behalf of the source cabinet. In this way, even if the source cabinet subsequently loses continuous power supply or wireless transmission capability, the centralized monitoring terminal can still receive alarm information with the source cabinet location and the starting point of the abnormality.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An alarm device for electrical equipment, characterized in that, include: The edge sampling alarm module includes an edge sampling channel connected between the power supply inlet of the cabinet alarm and the cabinet return path and connected to the external display alarm component of the cabinet door. It is used to obtain the instantaneous potential of the power supply inlet relative to the return path, calculate the sign flipping amount of adjacent sampling bits, generate a fault observation sequence, and drive the audible and visual alarm. The online change point detection module is used to perform online change point detection on the fault observation sequence. It recursively derives the receiving path value and the restart path value based on the local observation difference and the local recalculation value, respectively, and outputs the sampling bit at the beginning of the same path of the restart path value as the starting point of the abnormal situation. The hidden half-Markov decoding module is used to perform hidden half-Markov decoding on the fault observation sequence with the starting point of the abnormal situation as the starting bit. This enables the power supply status to change from holding through a drop to alarm pre-launch and then to the risk of loss of sound. It performs forward recursion and reverse backtracking according to the number of sampling bits at the state stop, and outputs the remaining sampling segments for wireless transmission. The short-time message wireless transmission module includes a wireless transmitter and a power supply channel that is pre-charged by the alarm power supply inlet and triggered by the start position of the remaining sampling segment of wireless transmission. It is used to distribute the transmission power within the remaining sampling segment of wireless transmission, convert the cabinet address into the source cabinet location code, and write the abnormal situation start point and the remaining sampling segment of wireless transmission into the short-time message. The wireless networking relay module is used to confirm wireless networking after the alarm device of the adjacent cabinet receives a short message. It generates the cabinet row adjacency result from the source cabinet location code and the cabinet location code, generates the sequence result from the abnormal situation starting point and the received sampling position, and generates the margin result by subtracting the arrived consumed sampling segment from the remaining sampling segment of wireless transmission. After all three results are true, it sends the networking alarm information to the centralized monitoring terminal. The online change point detection module includes: Online change point detection is performed on the fault observation sequence. The current sampling position in the fault observation sequence is taken as the local sampling position. The local observation difference is generated by subtracting the symbol flip amount corresponding to the previous sampling position from the symbol flip amount corresponding to the local sampling position. The running length of the previous sampling position is added by one and multiplied by the absolute value of the local observation difference to form the successor path value. For the local sampling position, the local sampling position number is written into the restart flag, the absolute value of the local observation difference is multiplied by the number of sampling positions between the local sampling position and the detection start position to form the restart path value, and the receiving path value and the restart path value are written into the local path table. The candidate path for this position is determined in descending order of the path value. When the restart path value is at the top of the candidate path for this position and the recalculation mark points to the sample position for this position, the sample position for this position is output as the starting point of the abnormal situation, and the starting point of the abnormal situation is written into the abnormal situation record of the alarm device.

2. The alarm device for power equipment according to claim 1, characterized in that: The edge sampling alarm module includes: Using the alarm power supply inlet of the alarm device as the sampling start point and the cabinet return path as the sampling reference point, the instantaneous potential of the power supply inlet relative to the return path is sequentially sampled through the edge sampling channel, and the instantaneous potential of each sampling point is bound with the sampling point number, and the potential record of this point is output. Read the local potential record, perform sign function to obtain the instantaneous potential of adjacent sampling bits, where the sampling bit with zero instantaneous potential adopts the sign value of the previous non-zero sampling bit, multiply the two adjacent sign values ​​to form the sign inheritance result, and generate the sign flip amount when the sign inheritance result changes from positive product inheritance to negative product inheritance, and then write the sign flip amount into the fault observation sequence according to the sampling bit number; Based on the sampling bit of the currently written symbol flip value in the fault observation sequence, the cabinet door external display alarm device is activated, so that the cabinet door external display alarm device carries the corresponding sampling bit sequence number in the local audible and visual alarm action and outputs the fault observation sequence.

3. The alarm device for power equipment according to claim 2, characterized in that: The hidden semi-Markov decoding module includes: Using the abnormal situation as the starting point of the hidden semi-Markov decoding, the symbol flip value is read from the fault observation sequence according to the sampling order, so that the power supply status grid is sequentially changed from the power supply holding state to the power supply drop state, then to the alarm preemptive state and terminated in the silence risk state. The observation cost of each status grid is generated by the difference between the current sampling bit number, the current state remaining sampling bit number and the symbol flip value of this bit relative to the symbol inheritance result of the previous grid, and the status grid record is output.

4. An alarm device for power equipment according to claim 3, characterized in that: The hidden semi-Markov decoding module also includes: Within the state grid record, a forward recursion is performed on each sample bit, causing the path that remains in the current state to increment the number of state-remaining sample bits by one, and causing the path to enter the next state to be connected along the predetermined transition direction of the power supply state grid. The observation cost is multiplied by the number of state-remaining sample bits and then accumulated to obtain the path cumulative cost. The path with the sorting number of one and its predecessor pointer are retained in ascending order of the path cumulative cost, and the restricted path table is output. From the state of silence risk, the sampling position is traced back along the preceding pointer to the state of alarm preemptive firing. The sampling segment between the two sampling positions is determined as the remaining sampling segment for wireless transmission, and the remaining sampling segment for wireless transmission is written into the alarm device's preemptive firing control record.

5. An alarm device for power equipment according to claim 4, characterized in that: The short message wireless transmission module includes: The starting bit of the remaining sampling segment of wireless transmission is used as the power supply channel release trigger bit. The number of remaining sampling bits is generated by subtracting the starting bit number from the ending bit number of the remaining sampling segment and adding one. The number of fixed loading bits of the short message is then subtracted from the number of remaining sampling bits to generate the transmission margin segment. Power is allocated to the wireless transmitter in the order of each sampling bit in the transmission margin segment, and the wireless transmission start record is output. Read the cabinet address, convert the cabinet address into the source cabinet location code according to the cabinet column order, generate the starting distance code by the bit order difference between the starting point of the abnormal situation and the starting point of the remaining sampling segment of the wireless transmission, and concatenate the source cabinet location code as the field header and the starting distance code as the field tail to generate the source cabinet preemptive transmission field. Within the transmission margin segment, the source cabinet's preemptive transmission field is written into the short message start segment, the remaining sampling bits are written into the short message check segment, and the writing order from the short message start segment to the short message check segment drives the wireless transmitter to perform wireless transmission to the alarm device of the adjacent cabinet, outputting the short message transmission record.

6. An alarm device for power equipment according to claim 5, characterized in that: The wireless networking relay module includes: After the alarm device of the adjacent cabinet receives the short message, it performs wireless networking confirmation reading on the short message. First, the source cabinet location code is restored from the short message start segment, and then the remaining sampling bits are restored from the short message check segment. The arrival consumption sampling segment is generated by subtracting the first arrival sampling bit of the short message from the sampling bits received by this cabinet. Subtract the location code of this cabinet from the location code of the source cabinet and take the absolute value. When the difference is equal to one, generate the cabinet column adjacency result; subtract the starting point of the abnormal situation from the received sampling bits of this cabinet to generate the sequential bit difference. When the sequential bit difference is a positive integer, generate the sequential result; subtract the arrival consumption sampling segment from the remaining sampling bits to generate the transmission margin. When the transmission margin is a positive integer, generate the margin result. After the adjacent cabinet results are written into the relay record of this cabinet, the sequential results and the remaining results are written in sequence. The source cabinet location code forms the source segment of the network alarm information, the location code of this cabinet forms the relay segment of the network alarm information, the abnormal situation starting point forms the timing segment of the network alarm information, and the transmission remaining amount forms the remaining segment of the network alarm information. The alarm information is then wirelessly transmitted to the centralized monitoring terminal through the adjacent cabinet alarm device.

7. An alarm method for electrical equipment, applied to an alarm device for electrical equipment as described in any one of claims 1-6, characterized in that, The method includes: S1. Obtain the instantaneous potential of the power supply inlet relative to the return path, calculate the sign flip of adjacent sampling bits, generate a fault observation sequence, and drive the audible and visual alarm. S2. Perform online change point detection on the fault observation sequence, and recursively deduce the receiving path value and restart path value based on the local observation difference and local recalculation value, respectively. Output the sampling bit with the restart path value at the first position of the same path as the starting point of the abnormal situation. S3. Using the starting point of the abnormal situation as the starting bit, perform hidden semi-Markov decoding on the fault observation sequence to make the power supply status change from holding through drop to alarm pre-launch and then to the risk of silence. Perform forward recursion and reverse backtracking according to the number of sampling bits of the status, and output the remaining sampling segments of wireless transmission. S4. Allocate power for transmission within the remaining sampling segment of wireless transmission, convert the cabinet address into the source cabinet location code, and write the abnormal situation starting point and the remaining sampling segment of wireless transmission into a short message. S5. After receiving a short message, the alarm device of the adjacent cabinet confirms the wireless networking. It generates the cabinet row adjacency result from the source cabinet location code and the location code of this cabinet. It generates the sequence result from the starting point of the abnormal situation and the received sampling position. It generates the margin result by subtracting the arrived consumption sampling segment from the remaining sampling segment of the wireless transmission. After all three results are true, it sends the networking alarm information to the centralized monitoring terminal.

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