Digital safety control system for power transformation equipment and leakage current and stray current

Abstract

This application relates to a digital safety control system for power receiving equipment and leakage current and stray current, which monitors and controls power receiving equipment installed in circuits supplying power from the power supply side to multiple loads. The system monitors and controls the high-voltage transformer (i.e., the transformer used for step-down distribution) installed in the power receiving equipment, as well as the distribution panels, sub-distribution panels, and other electrical equipment in the power receiving equipment connected to the circuits stepped down by the high-voltage transformer, preventing electrical accidents such as fires from occurring. The system continuously monitors the temperature of the high-voltage transformer and the instantaneous current flowing through the circuits in the distribution panels, sub-distribution panels, and other electrical equipment connected to the circuits stepped down by the high-voltage transformer. If the temperature of the high-voltage transformer exceeds a specified value, or if the instantaneous current flowing through the electrical equipment exceeds a specified value, the power supply to the loads is cut off.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims priority and rights based on the Paris Convention of international application PCT / JP2025 / 004394, filed on February 10, 2025, the entire contents of which are incorporated herein by reference.

[0003] This invention relates to a system for monitoring and controlling a circuit supplied from a power supply side to multiple loads in a transformer-equipped device. The system monitors and controls a high-voltage transformer and electrical equipment, the high-voltage transformer being a step-down transformer installed in the transformer-equipped device for power distribution, and the electrical equipment being installed in the circuit of the transformer-equipped device after the high-voltage transformer has stepped down the voltage. Thus, the system prevents electrical accidents such as fires from occurring, and prevents damage to various electrical and electronic equipment and devices that are part of the multiple loads. Furthermore, the system prevents electrical accidents such as short circuits, sparks, and tracking caused by short circuits in the low-voltage distribution panel, sub-distribution panel, control panel, and the system's main lines, wiring, terminal electrical equipment, and terminal load equipment in the transformer-equipped device. Background Technology

[0004] The applicant of this application has named a system for preventing electrical accidents that could lead to fires when a power-side circuit from the power source and a load-side circuit for a load that operates by receiving power are electrically connected via an electrical device. This system is called "DESCON" and has been implemented. The load-side circuit is a circuit oriented towards a load, such as lighting equipment, air conditioning equipment, refrigeration and cold storage equipment, or production equipment, which receives power and operates accordingly. Furthermore, the electrical device that connects the power-side circuit and the load-side circuit is a power receiving device, distribution panel, sub-distribution panel, lighting panel, power panel, control panel, junction box, etc., equipped with electronic devices such as main circuit breakers and residual current circuit breakers.

[0005] The applicant proposes and implements a system that enables automatic switching of multiple loads connected to the load-side circuit, and also enables automatic detection and calculation of power consumption in the loads, thus achieving labor-saving operation. This system is named "DESCON OPERATIONSAFETY SYSTEM" (Patent Document 2). Furthermore, the system prevents electrical accidents that could lead to fires by detecting leaks caused by loose bolts in the bolt and screw fastening connections of electrical devices, insufficient insertion of sockets, or dust accumulation in the bolt and screw fastening connections.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 6732278

[0009] Patent Document 2: Japanese Patent No. 6991636 Summary of the Invention

[0010] The purpose of this invention is to provide a system for monitoring and controlling a circuit supplied from the power supply side to multiple loads. This system monitors and controls the transformer (i.e., the high-voltage transformer) used for step-down distribution in the power receiving equipment, as well as the electrical equipment in the circuits stepped down by the high-voltage transformer within the power receiving equipment. This prevents electrical accidents such as fires, damage to various electrical and electronic equipment and devices serving as multiple loads, and further prevents electrical accidents caused by short circuits, sparks, and leakage current in the low-voltage distribution panel, sub-distribution panel, control panel, and the system's main lines, wiring, terminal electrical equipment, and terminal load equipment within the power receiving equipment.

[0011] The invention described in this application can be illustrated as follows. [1]

[0013] A digital safety control system for power receiving equipment and leakage current and stray current is provided for monitoring and controlling power receiving equipment equipped in circuits supplying power from the power supply side to multiple loads. The digital safety control system for power receiving equipment and leakage current and stray current includes:

[0014] The transformer temperature detection unit is configured for a step-down power distribution transformer installed in the aforementioned power receiving equipment, and acquires the temperature of the transformer, i.e., the transformer temperature detection value T. T ℃;

[0015] The instantaneous current value acquisition unit acquires the instantaneous current value i (amperes) flowing through the circuit of the electrical equipment in an instantaneous time, that is, the instantaneous AC current value or the instantaneous DC current value. The electrical equipment is equipped in the circuit of the power receiving equipment after being stepped down by the transformer.

[0016] The transformer temperature determination unit determines the temperature range pre-set for the heat resistance level and the transformer's detected temperature value T. T The heat resistance level is classified based on the heat resistance characteristics of the insulating materials used in the transformer when the transformer's probe temperature value TT℃ is known.

[0017] The instantaneous current value determination unit compares the pre-set allowable current value range for the circuit of the electrical equipment with the detected instantaneous current value i (amperes), and the instantaneous current value i (amperes) is acquired by the instantaneous current value acquisition unit of the electrical equipment.

[0018] The notification information sending unit outputs notification information to the manager terminal used by the manager who manages the substation equipment and / or the person in charge terminal used by the person in charge of the management of the substation equipment.

[0019] The notification information level determination unit determines the level of the notification information output by the notification information sending unit based on the comparison results of the transformer temperature determination unit and the instantaneous current value determination unit.

[0020] Automatic power supply cut-off determination unit;

[0021] First power supply disconnection unit; and

[0022] Second power supply cut-off unit

[0023] The notification information level determination unit:

[0024] When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T If the temperature reaches the allowable temperature range and the instantaneous current value determination unit determines that the instantaneous current value does not reach the allowable current value range, then the level of the notification information is set to "attention-awakening information".

[0025] When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T If the temperature does not reach the allowable temperature range for issuing attention, and if the comparison result of the instantaneous current value determination unit is that the current value reaches the allowable current value range for issuing attention, then a determination is made to set the level of the notification information to the attention-awakening information.

[0026] When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T If the temperature reaches the allowable temperature range and the comparison result of the instantaneous current value determination unit is the attention-generating current value within the allowable current value range, then the determination is made to set the notification information level to a different type of notification information, i.e., an alarm notification information, than the attention-awakening information.

[0027] When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T When the temperature reaches a value higher than the warning temperature within the allowable temperature range (i.e., the alarm activation temperature), or when the comparison result of the instantaneous current value determination unit shows a current value higher than the warning current value within the allowable current value range (i.e., the alarm activation current value), a determination is made to set the level of the notification information to the alarm notification information.

[0028] The notification information sending unit outputs the notification information according to the level determined by the notification information level determination unit.

[0029] When the notification information level determination unit determines that the notification information level is an alarm notification information, the automatic power supply cut-off determination unit determines whether each of the plurality of loads is an automatically power-cut-off load. These plurality of loads become the objects of comparison by the instantaneous current value determination unit. Current is supplied to the electrical equipment whose instantaneous current value i (amperes) has been acquired by the instantaneous current value acquisition unit.

[0030] The first power supply disconnection unit automatically disconnects the power supply to the load that the power supply disconnection determination unit determines can be automatically disconnected.

[0031] The second power supply cut-off unit cuts off the power supply to the load device control device, and then automatically cuts off the power supply to the load. The load device control device controls the load that is determined by the automatic power supply cut-off determination unit to be unable to automatically cut off the power supply. Attached Figure Description

[0032] Figure 1 This is a conceptual diagram illustrating a schematic structure of one embodiment of the digital safety control system for power receiving equipment and leakage current and stray current of the present invention. Detailed Implementation

[0033] The present invention relates to a digital safety control system for power receiving equipment and leakage current and stray current, which is a system for monitoring and controlling power receiving equipment 2 equipped in a circuit 6 supplying power from the power supply side to multiple loads 7. Figure 1 Furthermore, in this specification and accompanying drawings, the digital safety control system for power receiving equipment and leakage current and stray current of the present invention is sometimes referred to simply as "DESCON safety control system".

[0034] A power receiving device typically consists of a transformer for step-down distribution and multiple electrical devices installed in the circuit after the voltage has been stepped down by the transformer. Examples of these electrical devices in the power receiving device include, for example, distribution panels, sub-distribution panels, lighting panels, power panels, control panels, and remote control panels; junction boxes for branch wiring connections of extension cables or wiring between equipment and appliances; main circuit breakers, residual current circuit breakers, and circuit switches of different types, such as magnetic switches, power relays, and solid-state relays.

[0035] exist Figure 1 For the sake of simplicity, only the transformer 21 for step-down power distribution and the distribution panel 22 and circuit breaker 23, which are electrical equipment equipped in the circuit after the voltage is stepped down by the transformer 21, are shown in the diagram.

[0036] As multiple loads 7 that are supplied with electricity to the destination of the circuit 6 from the power supply side, such as electric motors, elevators, air conditioning equipment, ventilation equipment, lighting equipment, refrigerators and freezers, refrigerators and freezers, measuring instruments, computer equipment, surveillance cameras, medical equipment, communication devices, etc., which are electrical and electrical installations and equipment that are supplied with electricity and operate, including electrical and electrical installations and equipment used in buildings and other indoor and outdoor locations, electrical and electrical installations and equipment used in vehicles and mobile units such as trams, cars, airplanes, and ships, communication devices and equipment, etc., and the sockets to which they are connected.

[0037] In addition, when the aforementioned loads are measuring instruments, computer equipment, surveillance cameras, medical equipment, etc., for example, if the loads are configured such that the power supply cannot be automatically cut off, but the power supply to the load device control device that controls these loads is cut off first, and then the power supply to these loads is cut off, the load device control device, etc., are included.

[0038] These multiple loads 7 are connected to the front end of the circuit 6 on which the power transformer 2, which is to be monitored, is installed.

[0039] The heat resistance characteristics of the transformer in the power equipment 2 are as follows.

[0040] In addition, in this specification and accompanying drawings, "transformer" is sometimes referred to as "TR", "transformed equipment" as "distribution cabinet", and "current transformer" as "CT".

[0041] Based on the heat resistance characteristics of the insulating materials used, transformer 21 is classified into the following heat resistance levels.

[0042] As insulating materials, insulating oil, SF6 gas, kraft paper, pressed board, mica, glass fiber, epoxy resin, silicone resin, alkyd resin, and other materials are used, and the maximum permissible temperature range for insulating oil to alkyd resin is specified. Furthermore, oil-immersed transformers using the aforementioned insulating materials are classified as having a heat resistance rating of A, while molded transformers are classified as having ratings of B, F, and H.

[0043] The transformer is designed to operate under standard conditions without exceeding the temperature rise limit of the windings (the limit of the difference between the temperature of the windings and the ambient temperature), and the insulation is designed to operate without exceeding the maximum allowable temperature of the heat resistance class. The maximum allowable temperature may be exceeded when the ambient temperature exceeds the maximum value of 40°C, or due to excessive overload operation.

[0044] The lifespan of a transformer is most significantly affected by its maximum temperature. Therefore, prolonged continuous operation exceeding the maximum permissible temperature will shorten the transformer's expected lifespan (30 years). The transformer's environment and components should be considered as follows: for use in locations below 1,000m altitude; ambient temperature / indoor use: -5℃ to +40℃; outdoor use: -20℃ to +40℃; furthermore, the average daytime temperature should not exceed 35℃, and the average annual temperature should not exceed 20℃; the voltage waveform of the circuit connected to the transformer should be approximately sinusoidal; and the voltage balance of the three-phase circuit should be approximately balanced.

[0045] The reference winding temperature is a temperature used as a reference for calculating load loss, short-circuit impedance, and other characteristic values ​​because the resistance value varies with the winding temperature.

[0046] In the Japan Electrical Manufacturers Association standard number JEM 1310:2001, "Temperature Rise Limits and Reference Winding Temperatures (Heat Resistance Class H) for Dry-Type Transformers," the heat resistance class and temperature of the insulation material for TR (transformers) are set at 140K.

[0047] The reference winding temperature is a temperature used as a reference for calculating load loss, short-circuit impedance, and other characteristics because the resistance value varies with the winding temperature.

[0048] The boiling point of the insulating oil for 6kV oil-immersed transformers (JIS C 4303 1999), oil-immersed reactors (JIS 4902 2003), and 6kV molded transformers (JIS C 4306) used in power distribution is set to approximately 290℃~340℃.

[0049] The DESCON safety control system of the present invention comprises a transformer temperature acquisition unit 24, a switchboard instantaneous current value detection unit 25, a circuit breaker temperature acquisition unit 26, a circuit breaker instantaneous current value detection unit 27, a leakage current and stray current value detector ZCT28, etc., which are equipped on the transformer equipment 2 that is monitored and controlled, and a computer system 1 including a server computer, etc., connected to them via a network 5a. Figure 1 ).

[0050] Although not shown, computer system 1 includes an information input / output unit such as a CPU, ROM, RAM, hard disk, and communication interface, and can be configured as a computer with a structure that connects them using the required bus. The CPU, according to the operating system and pre-installed or downloaded computer programs, performs control to realize various functions of the system in this embodiment. The ROM functions as a storage unit for the operating system, various computer programs, etc., and also stores data required for the CPU to perform various control processes. RAM and hard disk are also used as working areas for storing data required for CPU processing, and the information is appropriately rewritten by the CPU.

[0051] exist Figure 1 In the computer system 1, which has a storage unit (not shown), there are a transformer temperature determination unit 11, an instantaneous current value determination unit 12, a notification information sending unit 13, a notification information level determination unit 14, an automatic power supply cut-off determination unit 15, a first power supply cut-off unit 16, a second power supply cut-off unit 17, a database processing unit 18, and a database information output unit 19.

[0052] The computer system executes the following processing actions, including the transformer temperature comparison unit 11, instantaneous current value determination unit 12, notification information sending unit 13, notification information level determination unit 14, automatic power supply cut-off determination unit 15, first power supply cut-off unit 16, second power supply cut-off unit 17, database processing unit 18, database information output unit 19, and other processing units not shown, as well as the following leakage tracking detection function, Joule heat detection function, overcurrent monitoring function, and leakage current monitoring function.

[0053] In addition, Figure 1In the embodiment shown, the transformer 21, the distribution panel 22, and the circuit breaker 23 of the power receiving equipment 2 are respectively equipped with a transformer temperature detection value acquisition unit 24, a distribution panel instantaneous current value acquisition unit 25, a circuit breaker temperature detection value acquisition unit 26, a circuit breaker instantaneous current value acquisition unit 27, and a leakage current and stray current value detector (ZCT) 28.

[0054] exist Figure 1 In the embodiment shown, the instantaneous current value acquisition unit 25 of the distribution panel is an instantaneous current value acquisition unit as follows: In the DESCON safety control system of the present invention, it acquires the instantaneous current value, i.e., the instantaneous AC current value or the instantaneous DC current value, of the circuit of the electrical equipment in the transformer equipment 2 which is equipped with a circuit stepped down by the transformer 21 at an instantaneous time.

[0055] Although not illustrated, it can be configured as follows: The electrical equipment equipped in the circuit stepped down by the transformer 21 in the power receiving equipment 2 is a distribution panel. As an instantaneous current value acquisition unit for acquiring the instantaneous current value of the circuit flowing through the distribution panel at an instantaneous time, that is, the instantaneous AC current value or the instantaneous DC current value, the distribution panel is equipped with a distribution panel instantaneous current value acquisition unit.

[0056] In addition, Figure 1 In the embodiment shown, an example equivalent to the instantaneous current value detection unit of the circuit breaker in this invention is the instantaneous current value acquisition unit 27 of the circuit breaker.

[0057] The instantaneous current value detection unit 25 of the power distribution panel is connected to the circuit in the power distribution panel 22 and detects the instantaneous current value, i.e., the instantaneous AC current value or the instantaneous DC current value, of the circuit flowing through the power distribution panel 22 in an instantaneous time.

[0058] As the instantaneous current value detection unit 25 of the distribution panel, it can employ a current sensor that uses a metering instrument converter called CT (Current Transformer) and a DC instantaneous current measuring device that uses Hall elements.

[0059] exist Figure 1 In the system, the transformer temperature detection unit 24, the distributor instantaneous current value acquisition unit 25, the circuit breaker temperature detection unit 26, the circuit breaker instantaneous current value acquisition unit 27, and the leakage current and stray current value detector (ZCT) 28 are connected to the computer system 1 via wired or wireless networks such as the Internet or dedicated lines to exchange information.

[0060] In addition, computer system 1 is connected to multiple administrator terminals 3a, 3b, ... and multiple responsible terminals 4a, 4b, 4c, ... via wired or wireless networks such as the Internet or dedicated lines, and can exchange information with each other.

[0061] The aforementioned manager terminals 3a, 3b, ... are equipped with image information display units such as monitors, and can be configured as personal computers or the like with software installed for using the system of the present invention. Furthermore, the aforementioned responsible personnel terminals 4a, 4b, 4c, ... can be configured as portable terminals such as smartphones that have downloaded applications for using the system of the present invention.

[0062] The manager terminals 3a, 3b, ... and the responsible terminals 4a, 4b, 4c, ... are connected to the computer system 1, which includes a server computer and the like, constituting the DESCON security control system of the present invention, via a wired or wireless communication network 4b such as the Internet or a dedicated line, and can exchange information with each other.

[0063] The aforementioned transformer temperature detection unit 24 is equipped for transformer 21 to monitor the temperature of transformer 21, i.e., the transformer temperature detection value T. T Treatment at ℃.

[0064] Transformer temperature detection value T T The temperature information (T) is transmitted via network 5a to computer system 1, which constitutes the DESCON safety control system of the present invention, and the transformer detects the temperature value T. T The ℃ information is constantly monitored by the transformer temperature detection value acquisition unit 24, which includes temperature sensors, and outputs it as digital information. The delivered transformer temperature detection value T... T The temperature information (℃) and identification were used to obtain the transformer's detected temperature value (T). T The information about the transformer at ℃ is associated with and stored together with information related to the acquisition time in the storage unit (not shown) of computer system 1. The information related to the acquisition time is recorded in units from year, month, day, hour, minute, and second, such as year, month, day, hour, minute, and second.

[0065] The instantaneous current value i (amperes) (instantaneous AC current value or instantaneous DC current value) is transmitted via network 5a to computer system 1, which constitutes the DESCON safety control system of the present invention. This instantaneous current value information is constantly monitored by the distributor instantaneous current value acquisition unit 25 and output as digital information. The transmitted instantaneous current value i (amperes) is associated with information identifying the electrical equipment whose instantaneous current value i (amperes) has been acquired, and is stored together with information related to the acquisition time in the storage unit (not shown) of computer system 1. Information related to the acquisition time is recorded, for example, in terms of the year, month, day, hour, minute, and second, in units from year, month, day to second.

[0066] The instantaneous time can be set arbitrarily between 1 / 50,000 of a second (=20 μsec) and 1 / 100,000 of a second (=10 μsec). Alternatively, it can be set to microseconds within this range, proportional to the performance of the computer (PC) constituting the DESCON security control system.

[0067] Setting the instantaneous time unit in instantaneous time detection to microseconds between 1 / 50,000 second (=20μsec) and 1 / 100,000 second (=10μsec) helps to detect the danger of tracking earlier and take necessary measures such as cutting off the power supply before tracking occurs.

[0068] The transformer temperature determination unit 11 performs the following processing: It checks the pre-set allowable temperature range for the heat resistance level and the transformer detection temperature value T. T The heat resistance level is determined by comparing the temperature at ℃ with the transformer's detection temperature T. T The insulation material used in transformer 21 at ℃ is classified according to its heat resistance properties.

[0069] The information relating to the aforementioned pre-set permissible temperature range, which serves as the comparison object, is stored in a storage unit (not shown) of computer system 1.

[0070] The instantaneous current value determination unit 12 performs the following processing: it compares the detected instantaneous current value with a pre-set allowable current value range for the circuit of the electrical equipment, i.e., the distribution panel 22, which has had its instantaneous current value acquired by the distribution panel instantaneous current value acquisition unit 25. In this case, information related to the pre-set allowable current value range for the circuit of the electrical equipment, i.e., the distribution panel 22, which is the object of comparison, is stored in a storage unit (not shown) of the computer system 1.

[0071] The notification information sending unit 13 processes the above notification information as follows: it outputs notification information to the manager terminals 3a, 3b, ... used by the manager of the substation equipment 2 and / or the responsible person terminals 4a, 4b, 4c, ... used by the person in charge of the management of the substation equipment 2.

[0072] The notification information level determination unit 14 performs the following processing: based on the comparison results of the transformer temperature determination unit 11 and the instantaneous current value determination unit 12, it determines the level of the notification information output by the notification information sending unit 13.

[0073] The determination process performed by the notification information level determination unit 14 includes the following processing.

[0074] <First Judgment Processing>

[0075] When the comparison result of the transformer temperature determination unit 11 is the above-mentioned transformer detected temperature value T T If the temperature reaches the allowable temperature range of ℃ and the instantaneous current value determination unit 12 determines that the current value does not reach the allowable current value range of ℃, then the level of the notification information is set to the attention-awakening information.

[0076] The notification information sending unit 13 outputs the notification information according to the level determined by the notification information level determination unit 14. That is, the notification information sending unit 13 performs the following processing: based on the above determination processing, it outputs the above-mentioned attention-awakening information as notification information to the administrator terminals 3a, 3b, ... and / or the responsible person terminals 4a, 4b, 4c, ...

[0077] Furthermore, it can be configured as follows: when the notification information sending unit 13 outputs attention-awakening information, the notification information sending unit 13 will compare the transformer detection temperature value T in the transformer 21 that is the object of the aforementioned determination by the notification information level determination unit 14. T Information related to ℃ and information related to the instantaneous current value i (amperes) in the electrical equipment (in the above case, the distribution panel 22) that is the object of the above determination by the notification information level determination unit 14 are added to the attention-awakening information to be output.

[0078] As described above, the transformer detection temperature value T is sent to the computer system 1, which constitutes the DESCON safety control system of the present invention. T The temperature information (℃) and identification were used to obtain the transformer's detected temperature value (T). T The information of the transformer at ℃ is associated with and stored together with the information related to the acquisition time in the storage unit (not shown) of computer system 1. Similarly, the instantaneous current value i (Ampere) delivered is associated with the information of the electrical device whose instantaneous current value i (Ampere) was acquired, and stored together with the information related to the acquisition time in the storage unit (not shown) of computer system 1.

[0079] Using this information, the transformer detection temperature T in the transformer 21, which is the object of the determination made by the notification information level determination unit 14, is compared with the transformer detection temperature value T. T Information related to ℃ and information related to the instantaneous current value i (amperes) in the electrical equipment (distributor 22 in the above case) that is the object of the determination by the notification information level determination unit 14 are added to the output of the notification information by the notification information sending unit 13.

[0080] <Second Judgment Processing>

[0081] When the comparison result of the transformer temperature determination unit 11 is the above-mentioned transformer detected temperature value T T If the temperature does not reach the allowable temperature range for issuing attention, and if the comparison result of the instantaneous current value determination unit 12 is that the current value reaches the allowable current value range for issuing attention, then the determination is made to set the level of the notification information to the above-mentioned attention-raising information.

[0082] The notification information sending unit 13 outputs the notification information according to the level determined by the notification information level determination unit 14. That is, the notification information sending unit 13 performs the following processing: based on the above determination processing, it outputs the above-mentioned attention-awakening information as notification information to the administrator terminals 3a, 3b, ... and / or the responsible person terminals 4a, 4b, 4c, ...

[0083] In this case, it can also be implemented as follows: as described above, the transformer detection temperature T in the transformer 21 that is the object of the determination by the notification information level determination unit 14. T Information related to ℃ and information related to the instantaneous current value i (amperes) in the electrical equipment (distributor 22 in the above case) that is the object of the determination by the notification information level determination unit 14 are added to the notification information (attention-raising information) output by the notification information sending unit 13.

[0084] <Third Judgment Processing>

[0085] When the comparison result of the transformer temperature determination unit 11 is the above-mentioned transformer detected temperature value T T When the temperature reaches the allowable temperature range and the instantaneous current value determination unit 12 determines that the current value reaches the allowable current value range, the notification information is set to a different type of notification information than the attention-awakening information, namely, an alarm notification information.

[0086] The notification information sending unit 13 outputs the notification information according to the level determined by the notification information level determination unit 14. That is, the notification information sending unit 13 performs the following processing: based on the above determination processing, it outputs the above alarm notification information as notification information to the manager terminals 3a, 3b, ... and / or the responsible person terminals 4a, 4b, 4c, ...

[0087] In this case, it can also be implemented as follows: as described above, the transformer detection temperature T in the transformer 21 that is the object of the determination by the notification information level determination unit 14. TInformation related to ℃ and information related to the instantaneous current value i (amperes) in the electrical equipment (distributor panel 22 in the above case) that is the object of the determination by the notification information level determination unit 14 are added to the notification information (alarm notification information) output by the notification information sending unit 13.

[0088] <Fourth Judgment Processing>

[0089] When the comparison result of the transformer temperature determination unit 11 is the above-mentioned transformer detected temperature value T T When the temperature reaches a value higher than the above-mentioned warning temperature within the above-mentioned allowable temperature range, i.e., the alarm temperature, or when the comparison result of the instantaneous current value determination unit 12 is a current value higher than the above-mentioned warning current value within the above-mentioned allowable current value range, i.e., the alarm current value, the determination is made to set the level of the above-mentioned notification information to the above-mentioned alarm notification information.

[0090] The notification information sending unit 13 outputs the notification information according to the level determined by the notification information level determination unit 14. That is, the notification information sending unit 13 performs the following processing: based on the above determination processing, it outputs the above alarm notification information as notification information to the manager terminals 3a, 3b, ... and / or the responsible person terminals 4a, 4b, 4c, ...

[0091] In this case, it can also be implemented as follows: as described above, the transformer detection temperature T in the transformer 21 that is the object of the determination by the notification information level determination unit 14. T Information related to ℃ and information related to the instantaneous current value i (amperes) in the electrical equipment (distributor panel 22 in the above case) that is the object of the determination by the notification information level determination unit 14 are added to the notification information (alarm notification information) output by the notification information sending unit 13.

[0092] As is known, considering the maximum permissible temperature set for each heat resistance class (e.g., Class A, Class E, Class B, Class F, Class H insulation) based on the heat resistance characteristics of the insulation material used in the transformer 21 which is being monitored, the above-mentioned permissible temperature range is arbitrarily set in advance according to each heat resistance class based on the heat resistance characteristics of the insulation material used in the transformer which is being monitored, within the range that can achieve the purpose of the present invention, so as to achieve the purpose of the present invention.

[0093] For example, the maximum allowable temperature of the transformer 21 being monitored is 130°C, and the maximum allowable current is 1718A (amperes). Within the scope of achieving the purpose of this invention, the allowable temperature range can be set to 120°C to 135°C. Similarly, the pre-set attention temperature can be set to 130°C, and the alarm temperature can be set to 135°C.

[0094] The aforementioned permissible current range, which is preset for the circuit of an electrical device whose instantaneous current value has been acquired by the instantaneous current value acquisition unit, can be set, for example, as a permissible current range corresponding to the cable size of the circuit of the electrical device whose instantaneous current value has been acquired by the instantaneous current value acquisition unit.

[0095] For example, the allowable current range that is preset according to the cable size of the circuit of the electrical equipment whose instantaneous current value has been acquired by the instantaneous current value acquisition unit can be set to 1.25 times or less of the rated current set for the circuit of that cable size; the attention emission current value that is preset can be set to 1.20 times or less of the rated current set for the circuit of the electrical equipment whose instantaneous current value has been acquired by the instantaneous current value acquisition unit; and the alarm emission current value that is preset can be set to 1.25 times or less of the rated current set for the circuit of the electrical equipment whose instantaneous current value has been acquired by the instantaneous current value acquisition unit.

[0096] Thus, in the digital safety control system for the power receiving equipment and leakage current and stray current of the present invention, the temperature of the transformer 21 used for step-down power distribution in the power receiving equipment and the instantaneous current value of the circuits in the electrical equipment such as the distribution panel and sub-distribution panel of the circuits stepped down by the transformer 21 in the power receiving equipment are constantly monitored.

[0097] Furthermore, if only one party meets the prescribed conditions for outputting attention information, attention information is output to the manager or person in charge. If only one party meets the prescribed conditions for outputting alarm information, requiring management and control at a higher level than the aforementioned conditions for outputting attention information, then a different type of attention information, namely alarm information, is output to the manager or person in charge. Additionally, if both parties meet the aforementioned conditions for outputting attention information, then the aforementioned alarm information is output to the manager or person in charge.

[0098] In this way, the temperature of the transformer 21 used for step-down distribution in the power receiving equipment and the instantaneous current value of the circuits in the distribution panels, sub-distribution panels, and other electrical equipment in the power receiving equipment equipped with circuits stepped down by the transformer 21 are constantly monitored. When one or both of the above-mentioned warning information output conditions and alarm information output conditions are reached simultaneously, different types of warning information and alarm information are output to the manager and the person in charge respectively. As a result, it is possible to prevent electrical accidents such as fires from occurring before they happen, to prevent accidents such as damage to various electrical and electronic equipment and devices that are multiple loads, and further, to prevent electrical accidents such as short circuits, sparks, and leakage current tracking caused by low-voltage distribution panels, sub-distribution panels, control panels, and system trunk lines, wiring, terminal electrical equipment, and terminal load equipment in the power receiving equipment.

[0099] The aforementioned automatic power supply cut-off determination unit 15 performs the following processing: when the notification information level determination unit 14 determines that the level of the notification information is the alarm notification information, it determines whether each of the multiple loads 7 is an automatically cut-off power supply load. The multiple loads become the objects of comparison by the instantaneous current value determination unit 12. The electrical equipment (in the above case, the distribution panel 22) that has obtained the instantaneous current value i (amperes) by the instantaneous current value acquisition unit (in the above case, the distribution panel instantaneous current value acquisition unit 25) is supplied with current.

[0100] Information such as whether each of the multiple loads 7 used in the determination process is a load whose power supply can be automatically cut off is stored in the storage unit (not shown) of the computer system 1.

[0101] In addition, the first power supply cut-off unit 16 performs the following processing: automatically cuts off the power supply to the load 7 that is determined by the power supply cut-off determination unit 15 to be automatically cut off.

[0102] For example, the processing unit of computer system 1 sends the specified signal information to the power receiving equipment 2 via the network 5a to automatically cut off the power supply to the load 7 that is determined by the power supply cut-off determination unit 15 to be automatically cut off, and gives instructions to the circuit breaker 23 and other equipment constituting the power receiving equipment 2 to perform the automatic cut-off of the power supply.

[0103] Then, the second power supply cut-off unit 17 performs the following processing: cuts off the power supply to the load device control device, and then automatically cuts off the power supply to the load 7, which is controlled by the load device control device that is determined by the power supply cut-off determination unit 15 to be unable to automatically cut off the power supply.

[0104] For example, the processing unit of computer system 1 sends the specified signal information to the power receiving equipment 2 via the network 5a to cut off the power supply to the load device control device that controls the load 7, which is determined by the power supply cut-off determination unit 15 to be unable to automatically cut off the power supply. Then, the power supply to the load is automatically cut off. The circuit breaker 23 and other equipment constituting the power receiving equipment 2 are instructed to cut off the power supply to the load device control device. Then, the power supply to the load is automatically cut off.

[0105] The DESCON safety control system described above can be configured as a system with leakage current tracking detection function as follows: the simulated instantaneous AC current value or simulated instantaneous DC current value detected by the instantaneous current value acquisition unit 25 of the distribution panel is converted into an analog voltage value, the analog voltage value is converted into a digital voltage value, the digital voltage value is converted into a current value, and abnormal current is detected.

[0106] The processing unit of computer system 1 can perform the following steps based on the simulated instantaneous current value (simulated instantaneous AC current value or simulated instantaneous DC current value) acquired by computer system 1: converting the simulated instantaneous AC current value or simulated instantaneous DC current value detected by the distributor instantaneous current value acquisition unit 25 into an analog voltage value, converting the analog voltage value into a digital voltage value, and converting the digital voltage value into a current value, thereby performing abnormal current detection. Alternatively, a microcomputer can be attached to the distributor instantaneous current value acquisition unit 25, and the above processing can be performed by the microcomputer.

[0107] When the electrical device whose instantaneous current value is acquired by the instantaneous current value acquisition unit is a cut-off device (circuit breaker) 23, or when, in addition to the electrical device whose instantaneous current value is acquired by the instantaneous current value acquisition unit, a cut-off device (circuit breaker) 23 is also equipped in the circuit after being stepped down by the transformer 21 in the power equipment 2, the circuit breaker detection temperature value acquisition unit 26, which also monitors the temperature rise caused by Joule heat at the terminal block of the connection part of the circuit in the cut-off device (circuit breaker) 23, can be configured as a DESCON safety control system with Joule heat detection function.

[0108] When the circuit breaker 23 is provided, a circuit breaker detection temperature value acquisition unit 26 is provided for the circuit breaker 23 to continuously monitor the temperature of the connection terminal block of the circuit in the circuit breaker 23.

[0109] The temperature value information detected by the terminal block of the connection part is transmitted to the computer system 1 constituting the DESCON safety control system of the present invention via the Internet, dedicated line or other network 5a. The temperature value information detected by the terminal block of the connection part is constantly monitored by the circuit breaker temperature detection acquisition unit 26, which includes temperature sensors and the like, and outputs it as digital information.

[0110] The temperature information of the connection terminal block of the circuit in the cut-off device (circuit breaker) 23 is caused by Joule heating. Therefore, the DESCON safety control system including the computer system 1 is structured such that it has a Joule heating detection function by monitoring the acquired connection terminal block temperature value information.

[0111] Alternatively, it can be configured such that a circuit breaker instantaneous current value detection unit 27 for monitoring the overcurrent of the circuit in the circuit breaker 23 is provided for the cut-off device (circuit breaker) 23, and the overcurrent of the circuit in the cut-off device (circuit breaker) 23 is always monitored.

[0112] The overcurrent value information detected by the terminal block of the connection part is sent to the computer system 1 constituting the DESCON safety control system of the present invention via network 5a. The overcurrent value information detected by the terminal block of the connection part is constantly monitored by the instantaneous current value detection unit 27 of the circuit breaker and output as digital information.

[0113] Therefore, the DESCON safety control system of the present invention can be configured as follows: by monitoring the obtained overcurrent value information of the connection terminal block, it can have an overcurrent monitoring function.

[0114] As the instantaneous current value detection unit 27 for the circuit breaker is the same as the instantaneous current value acquisition unit 25 for the distribution panel, it can use a current sensor that uses a current transformer for metering instruments called a CT (Current Transformer) or a DC instantaneous current measuring device that uses a Hall element.

[0115] Furthermore, the instantaneous time can be arbitrarily set between 1 / 50,000 of a second (=20 μsec) and 1 / 100,000 of a second (=10 μsec). Alternatively, it can be set to microseconds within this range, proportional to the performance of the computer (PC) constituting the DESCON security control system.

[0116] Furthermore, it can be configured such that a leakage current and stray current value detector ZCT (Zero-phase Current Transformer) 28 is provided for the cut-off device (circuit breaker) 23 to monitor the leakage current and stray current of the circuit in the cut-off device (circuit breaker) 23, and the leakage current and stray current of the circuit in the cut-off device (circuit breaker) 23 are always monitored.

[0117] The leakage current value information is sent via network 5a to the computer system 1 that constitutes the DESCON safety control system of the present invention. The leakage current value information is constantly monitored by the leakage current and stray current value detector 28 and output as digital information.

[0118] Therefore, the DESCON safety control system can be configured as follows: by monitoring the acquired leakage current and stray current values, it can have the function of monitoring leakage current and stray current.

[0119] For example, it can be configured to have the following units (e.g., database processing unit 18): the leakage current is defined as the attention leakage current and the alarm leakage current, and the stray current is defined as the attention stray current and the alarm stray current. The leakage current, stray current, etc. are stored, for example, by seconds, minutes, hours, days, weeks, 10 days, months, 3 months of each season, 6 months, 1 year, etc., 1 year ago, 2 years ago, 3 years ago, ..., 5 years ago, ..., n years ago, etc., and a database in computer system 1 is constructed (not shown).

[0120] That is, assuming a structure in computer system 1 that includes a database processing unit, this database processing unit will combine the aforementioned transformer detection temperature value T obtained by the transformer detection temperature value acquisition unit 24 with... T Information related to ℃, information related to the instantaneous DC current value detected by the instantaneous current value detection unit, i.e., the instantaneous current value acquisition unit 25 of the distribution panel, and information related to the leakage current and stray current values ​​obtained by the leakage current and stray current value detector ZCT are databaseed and recorded in the database.

[0121] The transformer detection temperature value T obtained by the transformer detection temperature value acquisition unit 24 T The temperature information (℃) and identification were used to obtain the transformer's detected temperature value (T). T The information about the transformer at ℃ is associated with and stored in the storage unit (not shown) of computer system 1 along with information related to the acquisition time. The instantaneous current value i (Amperes) (instantaneous AC current value or instantaneous DC current value) information acquired by the distributor instantaneous current value acquisition unit 25 is associated with information identifying the electrical equipment whose instantaneous current value i (Amperes) has been acquired, and stored in the storage unit (not shown) of computer system 1 along with information related to the acquisition time. The information related to the leakage current and stray current values ​​obtained by the leakage current and stray current value detector ZCT is associated with information identifying the circuit breaker 23, and stored in the storage unit (not shown) of computer system 1 along with information related to the acquisition time.

[0122] Therefore, the structure can be configured as follows: the information is database-based by the aforementioned database-based unit (e.g., database processing unit 18), and when the computer system 1 receives an information provision request from the administrator terminal 3a, 3b, ..., the responsible terminal 4a, 4b, 4c, ... via the network 5b, the information corresponding to the information provision request is extracted from the database and sent from the computer system 1 to the administrator terminal 3a, 3b, ..., the responsible terminal 4a, 4b, 4c, ... via the network 5b.

[0123] That is, suppose that computer system 1 has a structure of database information output unit 19. When the database information output unit 19 receives an information provision request from the administrator terminal 3a, 3b, ... or the responsible terminal 4a, 4b, 4c, ..., it extracts the information corresponding to the information provision request from the database and sends it to the administrator terminal 3a, 3b, ... or the responsible terminal 4a, 4b, 4c, ... that requested the information provision.

[0124] The aforementioned processing units, such as the transformer temperature comparison unit 11, instantaneous current value determination unit 12, notification information sending unit 13, and notification information level determination unit 14, do not need to be equipped in one device or equipment.

[0125] For example, it can also be configured as follows: the power receiving equipment 2, which is the object of monitoring and control, is equipped with a device and equipment having a part of the structure, which is located away from the power receiving equipment 2, and can be connected via a wired or wireless network to exchange information with other devices and equipment, including computers, having other structures.

[0126] Alternatively, it can be configured as follows: the power equipment being monitored and controlled is equipped with a device and equipment having a portion of the above-described structure, which is located away from the power equipment being monitored and controlled, and is connected via a wired or wireless network to other devices and equipment including a computer having a portion of the other structure, as well as other devices and equipment including a computer having the remaining portion of the other structure, to exchange information.

[0127] It can also be configured as follows: In the above, among one or more other devices and equipment, there is a server computer located in the cloud, which is located away from the power receiving equipment 2 and connected via a wired or wireless network, and has a part or the remainder of the above other structures.

[0128] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technology as described in the claims.

Claims

1. A digital safety control system for power receiving equipment and leakage current and stray current, for monitoring and controlling power receiving equipment installed in circuits supplying power from the power supply side to multiple loads, wherein the digital safety control system for power receiving equipment and leakage current and stray current comprises: The transformer temperature detection unit is configured for a step-down power distribution transformer installed in the aforementioned power receiving equipment, and acquires the temperature of the transformer, i.e., the transformer temperature detection value T. T ℃; The instantaneous current value acquisition unit acquires the instantaneous current value i (amperes) flowing through the circuit of the electrical equipment in an instantaneous time, that is, the instantaneous AC current value or the instantaneous DC current value. The electrical equipment is equipped in the circuit of the power receiving equipment after being stepped down by the transformer. The transformer temperature determination unit determines the temperature range pre-set for the heat resistance level and the transformer's detected temperature value T. T The heat resistance level is classified based on the heat resistance characteristics of the insulating materials used in the transformer when the transformer's probe temperature value TT℃ is known. The instantaneous current value determination unit compares the pre-set allowable current value range for the circuit of the electrical equipment with the detected instantaneous current value i (amperes), and the instantaneous current value i (amperes) is acquired by the instantaneous current value acquisition unit of the electrical equipment. The notification information sending unit outputs notification information to the manager terminal used by the manager who manages the substation equipment and / or the person in charge terminal used by the person in charge of the management of the substation equipment. The notification information level determination unit determines the level of the notification information output by the notification information sending unit based on the comparison results of the transformer temperature determination unit and the instantaneous current value determination unit. Automatic power supply cut-off determination unit; First power supply cutoff unit; as well as Second power supply cut-off unit The notification information level determination unit: When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T If the temperature reaches the allowable temperature range and the instantaneous current value determination unit determines that the instantaneous current value does not reach the allowable current value range, then the level of the notification information is set to "attention-awakening information". When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T If the temperature does not reach the allowable temperature range for issuing attention, and if the comparison result of the instantaneous current value determination unit is that the current value reaches the allowable current value range for issuing attention, then a determination is made to set the level of the notification information to the attention-awakening information. When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T If the temperature reaches the allowable temperature range and the comparison result of the instantaneous current value determination unit is the attention-generating current value within the allowable current value range, then the determination is made to set the notification information level to a different type of notification information, i.e., an alarm notification information, than the attention-awakening information. When the comparison result of the transformer temperature determination unit is the transformer detected temperature value T T When the temperature reaches a value higher than the warning temperature within the allowable temperature range (i.e., the alarm activation temperature), or when the comparison result of the instantaneous current value determination unit shows a current value higher than the warning current value within the allowable current value range (i.e., the alarm activation current value), a determination is made to set the level of the notification information to the alarm notification information. The notification information sending unit outputs the notification information according to the level determined by the notification information level determination unit. When the notification information level determination unit determines that the notification information level is an alarm notification information, the automatic power supply cut-off determination unit determines whether each of the plurality of loads is an automatically power-cut-off load. These plurality of loads become the objects of comparison by the instantaneous current value determination unit. Current is supplied to the electrical equipment whose instantaneous current value i (amperes) has been acquired by the instantaneous current value acquisition unit. The first power supply disconnection unit automatically disconnects the power supply to the load that the power supply disconnection determination unit determines can be automatically disconnected. The second power supply cut-off unit cuts off the power supply to the load device control device, and then automatically cuts off the power supply to the load. The load device control device controls the load that is determined by the automatic power supply cut-off determination unit to be unable to automatically cut off the power supply.

2. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 1, wherein, The transformer detection temperature value T in the transformer that is the object of the determination made by the notification information level determination unit. T Information related to ℃ and information related to the instantaneous current value i (amperes) in the electrical equipment that is the subject of the determination by the notification information level determination unit are added to the output of the notification information by the notification information sending unit.

3. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 1, wherein, The instantaneous time is any microsecond between 1 / 50,000 of a second (=20 μsec) and 1 / 100,000 of a second (=10 μsec).

4. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 3, wherein, have: The tracking current detection function converts the simulated instantaneous AC current value or simulated instantaneous DC current value detected by the instantaneous current value acquisition unit into an analog voltage value, converts the analog voltage value into a digital voltage value, and converts the digital voltage value into a current value to detect abnormal current.

5. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 3, wherein, When the electrical device whose instantaneous current value is acquired by the instantaneous current value acquisition unit is a disconnector (circuit breaker), or when, in addition to the electrical device whose instantaneous current value is acquired by the instantaneous current value acquisition unit, a disconnector (circuit breaker) is also equipped in the circuit of the power receiving equipment after voltage reduction by the transformer. By also having a circuit breaker temperature detection value acquisition unit that monitors the temperature rise caused by Joule heating of the terminal block of the circuit connection section in the cut-off device (circuit breaker), it has a Joule heating detection function.

6. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 5, wherein, The circuit breaker has an overcurrent monitoring function by also having a circuit breaker instantaneous current value detection unit that monitors the overcurrent in the circuit.

7. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 5, wherein, The device also includes a leakage current and stray current value detector (ZCT, Zero-phase Current Transformer) to monitor the leakage current and stray current of the circuit in the circuit breaker, thereby providing leakage current and stray current monitoring functions.

8. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 6, wherein, The device also includes a leakage current and stray current value detector (ZCT, Zero-phase Current Transformer) to monitor the leakage current and stray current of the circuit in the circuit breaker, thereby providing leakage current and stray current monitoring functions.

9. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 7, wherein, It also has: The database processing unit will process the transformer detection temperature value T obtained by the transformer detection temperature value acquisition unit. T Information related to ℃, information related to the instantaneous DC current value detected by the instantaneous current value acquisition unit, and information related to the leakage current and stray current value mastered by the leakage current and stray current value detector ZCT are databaseed and recorded as a database.

10. The digital safety control system for power receiving equipment and leakage current and stray current according to claim 9, wherein, It also has: A database-based information output unit, when receiving an information provision request from the administrator terminal or the responsible person terminal, extracts information corresponding to the information provision request from the database and sends it to the administrator terminal or the responsible person terminal that requested the information provision.

Images