CN104113047A - Electricity utilization protection method and electricity utilization protection device based on comprehensive integration of public transformers - Google Patents
Electricity utilization protection method and electricity utilization protection device based on comprehensive integration of public transformers Download PDFInfo
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- CN104113047A CN104113047A CN201310139903.3A CN201310139903A CN104113047A CN 104113047 A CN104113047 A CN 104113047A CN 201310139903 A CN201310139903 A CN 201310139903A CN 104113047 A CN104113047 A CN 104113047A
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Abstract
The invention discloses an electricity utilization protection method based on comprehensive integration of public transformers. The method comprises the following steps: a voltage transformer and a current transformer are connected in parallel to a low-voltage wire outlet end of a public transformer to acquire voltage and current information of the low-voltage wire outlet end of the public transformer in real time and obtain real-time voltage and current data; data operation processing is performed on the real-time voltage and current data to obtain the real-time relevant electric quantity value of a power supply line; the relevant electric quantity value is compared with a corresponding preset electric quantity value to judge whether the relevant electric quantity value meets the conditions of electricity utilization protection; and when the relevant electric quantity value meets the conditions of electricity utilization protection, electricity utilization protection is executed, wherein electricity utilization protection includes short-circuit protection, zero-sequence over-current protection, overvoltage protection, under-voltage protection, zero line breaking protection, phase lack protection, single-phase high-impedance grounding protection and/or three-phase power balance protection. The invention further discloses an electricity utilization protection device. By adopting the electricity utilization protection method and the electricity utilization protection device of the invention, power supply lines can be comprehensively and effectively protected, and the safety and reliability of electricity utilization can be improved.
Description
Technical field
The present invention relates to power domain, relate in particular to a kind of common transformer integrated electricity protection method and protective device comprehensively.
Background technology
Along with the quickening of China's economic development step, electric power becomes the important infrastructure of each field development.Urban and rural power grids construction and reform that China's power industry is implemented have for many years obtained significant achievement, have greatly improved power supply quality, have strengthened grid structure, have formed the distribution network of safe, reliable and large coverage rate.But along with power electronic technology is in the extensive use of electric power and the access of all kinds of novel electric power load, a large amount of non-linear, impacts, wavy load in electric power system, are increased, cause the fail safe of power consumption equipment to reduce, weakened reliability and the economy of operation of power networks.Tradition distribution is because cost and technical problem; common transformer user outlet only configures simple short-circuit protection; in the time facing the difficult problems such as circuit overload, the single-phase high resistance ground of circuit, circuit phase shortage and circuit zero line break, cannot effectively protect the electricity consumption reliability of user's outlet comprehensively.
Summary of the invention
Technical problem to be solved by this invention is; a kind of common transformer integrated electricity protection method and protective device is comprehensively provided; can comprehensive integrated electricity protection; comprise short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection; user can be according to specific needs arbitrarily or combination single to it carry out integrated configuration; to realize the general protection to supply line, improve the reliability of electricity consumption.
In order to solve the problems of the technologies described above, the invention provides a kind of common transformer integrated electricity protection method comprehensively, comprise: by voltage transformer and the public step-down of the parallel access of current transformer are extruded to line end, the public step-down of Real-time Collection extrudes voltage and the current information of line end, obtains real-time voltage and current data; Described real-time voltage and current data are carried out to data operation processing, obtain the real-time associated electrical value of supply line, described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value; Described associated electrical value is contrasted with corresponding default charge value, judge whether to meet the condition of electricity protection, while being judged as YES, the action of execution electricity protection, described electricity protection comprises short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection; The condition of described short-circuit protection comprises that described real-time current value exceedes default short circuit current protection definite value, and the duration exceedes the default time delay short-circuit protection time; The condition of described zero sequence overcurrent protection comprises that described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, and the duration exceedes the default time delay zero sequence overcurrent protection time; The condition of described overvoltage protection comprises that in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, and the duration exceedes the default time delay overvoltage protection time; The condition of described under-voltage protection comprises that magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, and the duration exceedes the default time delay under-voltage protection time; The condition of described open-phase protection comprises that described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, and the duration exceedes the default time delay open-phase protection time; The condition of described protection off zero comprises that described real-time voltage deviation value exceedes default protection definite value off zero, and the duration exceedes default time delay guard time off zero; The condition of described single-phase high resistance earthing protecting comprises that described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value, and the duration exceedes the single-phase high resistance earthing protecting time of default time delay; The condition of described three-phase power balance protection comprises that described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, and the duration exceedes default time delay three-phase power balance guard time.
As the improvement of such scheme, the described concrete steps that described real-time voltage and current data are carried out to data operation processing comprise: real-time voltage and current data are carried out to digital filtering processing; Carry out discrete Fourier computing to carrying out digital filtering real-time voltage after treatment and current data, calculate amplitude and the angle of voltage, electric current, and proofread and correct, obtain the deal with data of voltage and electric current; The deal with data of described voltage and electric current is carried out to vector calculus, calculate the real-time associated electrical value of supply line.
As the improvement of such scheme, described associated electrical value is contrasted with corresponding default charge value, judge whether to meet the condition of alarm, while being judged as YES, send alarm signal.
As the improvement of such scheme; supply line to the action of executed electricity protection carries out Real-Time Monitoring; judge whether to meet the condition of automatic closing; while being judged as YES; the action of execution automatic closing; with the work of restoring electricity, the condition of described automatic closing comprises that the processed reparation of fault is perfect, circuit breaker is in inputting effective gate-dividing state.
Correspondingly, the present invention also provides a kind of Protector for using electricity, the data acquisition module, outlet module, memory and the display module that comprise main processing block and be connected with described main processing block; Described main processing block is mainly used in integrated, computing and the analyzing and processing of data, obtains real-time associated electrical value, and judges whether to need electricity protection and send corresponding control command according to real-time associated electrical value; Described data acquisition module is mainly used in voltage and the current information of the public step-down extrusion of Real-time Collection line end, obtains real-time voltage and current data; When described outlet module is used for supply line's fault, carry out electricity protection action, cut off supply line; Described memory is mainly used in event, real-time charge value and predetermined current Value Data to record storage; The inquiry that described display module is mainly used in inquiry, the definite value of the demonstration of data, each parameter is adjusted and the input of control command; Described main processing block comprises for the data processing unit of data processing, for calculating the computing unit of the real-time associated electrical value of supply line according to described real-time voltage and current data, for judge and issue the electricity protection Logical processing unit of corresponding control command to whether needing to start electricity protection and/or alarm according to real-time associated electrical value.
As the improvement of such scheme, described data acquisition module is used for the voltage transformer of Real-time Collection information of voltage and the current transformer for Real-time Collection current information, and the public step-down of the parallel access of described voltage transformer and current transformer extrudes line end; Described outlet module comprises the circuit breaker that cuts off supply line when electricity protection moves for carrying out; Described display module comprises display screen.
As the improvement of such scheme, described Protector for using electricity also comprises the alarm module for sending alarm signal, and described alarm module is connected with main processing block; Described alarm module comprises audible-visual annunciator.
As the improvement of such scheme, described Protector for using electricity also comprise for and higher level's master controller and user side between the communication module of two-way interaction.
As the improvement of such scheme, described Protector for using electricity also comprises that described relay module is connected with main processing block for the circuit that closes a floodgate, the relay module that restores electricity; Described relay module comprises relay.
As the improvement of such scheme, described Protector for using electricity also comprises the power module for stand-by power supply is provided.
Implementing beneficial effect of the present invention is: can be by voltage transformer and the public step-down of the parallel access of current transformer are extruded to line end, the public step-down of Real-time Collection extrudes voltage and the current information of line end, obtain real-time voltage and current data, then by the data processing unit on main processing block and computing unit, described real-time voltage and current data are carried out to data operation processing, obtain the real-time associated electrical value of supply line, described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value, by electricity protection Logical processing unit on main processing block, described associated electrical value is contrasted with corresponding default charge value again, judge whether to meet the condition of electricity protection, in the time being judged as YES, send the instruction of carrying out electricity protection action to outlet module, the circuit breaker of controlling on outlet module cuts off supply line, to realize, faulty line is isolated, prevent from singlely expanding All other routes to line fault and affecting the normal operation of other equipment, guarantee the fail safe of electricity consumption, simultaneously, described electricity protection comprises short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection, user can be according to specific needs carries out any Selection and Constitute configuration, integrated to each concrete protection project in electricity protection one or more, both the needs of different occasions can have been adapted to, can realize again the general protection to supply line, improve fail safe and the reliability of electricity consumption.
In addition, before carrying out electricity protection action, by electricity protection Logical processing unit, described associated electrical value is contrasted with corresponding default charge value, judge whether to need to start alarm, if while being judged as YES, start alarm, send alarm signal, break down to notify electricity consumption subscriber's line, make it make in time suitable processing; The present invention also can carry out Real-Time Monitoring to the supply line of executed electricity protection action, judges whether to start automatic closing action, in the time being judged as YES; start automatic closing action, control relay automatic closing, work restores electricity; it uses very safe and convenient, has improved operating efficiency.
Brief description of the drawings
Fig. 1 is a kind of common transformer of the present invention the first embodiment schematic flow sheet of integrated electricity protection method comprehensively;
Fig. 2 is a kind of common transformer of the present invention the second embodiment schematic flow sheet of integrated electricity protection method comprehensively;
Fig. 3 is a kind of common transformer of the present invention the 3rd embodiment schematic flow sheet of integrated electricity protection method comprehensively;
Fig. 4 is a kind of common transformer of the present invention the 4th embodiment schematic flow sheet of integrated electricity protection method comprehensively;
Fig. 5 is the structural representation of a kind of Protector for using electricity of the present invention;
Fig. 6 is another structural representation of a kind of Protector for using electricity of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is a kind of common transformer of the present invention the first embodiment schematic flow sheet of integrated electricity protection method comprehensively, comprising:
S100, by voltage transformer and the public step-down of the parallel access of current transformer are extruded to line end, the public step-down of Real-time Collection extrudes voltage and the current information of line end, obtains real-time voltage and current data.
Preferably, described voltage transformer and current transformer by gather voltage and current signal by discretization, the digitlization synchronized sampling of 128, every cycle, obtain real-time voltage and current data.
S101, carries out data operation processing to described real-time voltage and current data, obtains the real-time associated electrical value of supply line.
Described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value.
It should be noted that, the real-time associated electrical value of supply line of acquisition all comprises the associated electrical value of each phase on three-phase.
S102, contrasts described associated electrical value with corresponding default charge value, judge whether to meet the condition of electricity protection, while being judged as YES, carries out S103, while being judged as NO, and process ends.
Described electricity protection comprises short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection.
The condition of described short-circuit protection comprises that described real-time current value exceedes default short circuit current protection definite value, and the duration exceedes the default time delay short-circuit protection time.
The condition of described zero sequence overcurrent protection comprises that described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, and the duration exceedes the default time delay zero sequence overcurrent protection time.
The condition of described overvoltage protection comprises that in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, and the duration exceedes the default time delay overvoltage protection time.
The condition of described under-voltage protection comprises that magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, and the duration exceedes the default time delay under-voltage protection time.
The condition of described open-phase protection comprises that described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, and the duration exceedes the default time delay open-phase protection time.
The condition of described protection off zero comprises that described real-time voltage deviation value exceedes default protection definite value off zero, and the duration exceedes default time delay guard time off zero.
The condition of described single-phase high resistance earthing protecting comprises that described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value, and the duration exceedes the single-phase high resistance earthing protecting time of default time delay.
The condition of described three-phase power balance protection comprises that described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, and the duration exceedes default time delay three-phase power balance guard time.
It should be noted that, in described electricity protection, the default protection definite value of each concrete protection project and default delay protection time all should set in advance before use, and record storage; In addition, user can be according to specific needs carries out any Selection and Constitute configuration, integrated to each concrete protection project in electricity protection one or more, both can adapt to the needs of different occasions, can realize again the general protection to supply line, improves the reliability of electricity consumption.
S103, carries out electricity protection action.
It should be noted that, carry out electricity protection action and be preferably separating brake and cut off supply line, to realize, faulty line or equipment are isolated, prevent from singlely expanding All other routes to electric line or equipment fault and affecting the normal operation of other equipment; In addition, after fault restoration is improved, user can, by the restore electricity powered operation of circuit of closing by hand, also can realize automatic closing action by automatic switching-on device is set.
Fig. 2 is a kind of common transformer of the present invention the second embodiment schematic flow sheet of integrated electricity protection method comprehensively, comprising:
S200, by voltage transformer and the public step-down of the parallel access of current transformer are extruded to line end, the public step-down of Real-time Collection extrudes voltage and the current information of line end, obtains real-time voltage and current data.
Preferably, described voltage transformer and current transformer by gather voltage and current signal by discretization, the digitlization synchronized sampling of 128, every cycle, obtain real-time voltage and current data.
S201, carries out digital filtering processing by real-time voltage and current data.
S202, carries out discrete Fourier computing to carrying out digital filtering real-time voltage after treatment and current data, calculates amplitude and the angle of voltage, electric current, and proofreaies and correct, and obtains the deal with data of voltage and electric current.
S203, carries out vector calculus by the deal with data of described voltage and electric current, calculates the real-time associated electrical value of supply line.
Described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value.
It should be noted that, the real-time associated electrical value of supply line of acquisition all comprises the associated electrical value of each phase on three-phase.
S204, contrasts described associated electrical value with corresponding default charge value, judge whether to meet the condition of electricity protection, while being judged as YES, carries out S205, while being judged as NO, and process ends.
Described electricity protection comprises short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection.
The condition of described short-circuit protection comprises that described real-time current value exceedes default short circuit current protection definite value, and the duration exceedes the default time delay short-circuit protection time.
The condition of described zero sequence overcurrent protection comprises that described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, and the duration exceedes the default time delay zero sequence overcurrent protection time.
The condition of described overvoltage protection comprises that in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, and the duration exceedes the default time delay overvoltage protection time.
The condition of described under-voltage protection comprises that magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, and the duration exceedes the default time delay under-voltage protection time.
The condition of described open-phase protection comprises that described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, and the duration exceedes the default time delay open-phase protection time.
The condition of described protection off zero comprises that described real-time voltage deviation value exceedes default protection definite value off zero, and the duration exceedes default time delay guard time off zero.
The condition of described single-phase high resistance earthing protecting comprises that described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value, and the duration exceedes the single-phase high resistance earthing protecting time of default time delay.
The condition of described three-phase power balance protection comprises that described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, and the duration exceedes default time delay three-phase power balance guard time.
It should be noted that, in described electricity protection, the default protection definite value of each concrete protection project and default delay protection time all should set in advance before use, and record storage; In addition, user can be according to specific needs carries out any Selection and Constitute configuration, integrated to each concrete protection project in electricity protection one or more, both can adapt to the needs of different occasions, can realize again the general protection to supply line, improves the reliability of electricity consumption.
S205, carries out electricity protection action.
It should be noted that, carry out electricity protection action and be preferably separating brake and cut off supply line, to realize, faulty line or equipment are isolated, prevent from singlely expanding All other routes to electric line or equipment fault and affecting the normal operation of other equipment; In addition, after fault restoration is improved, user can, by the restore electricity powered operation of circuit of closing by hand, also can realize automatic closing action by automatic switching-on device is set.
Fig. 3 is a kind of common transformer of the present invention the 3rd embodiment schematic flow sheet of integrated electricity protection method comprehensively, comprising:
S300, by voltage transformer and the public step-down of the parallel access of current transformer are extruded to line end, the public step-down of Real-time Collection extrudes voltage and the current information of line end, obtains real-time voltage and current data.
Preferably, described voltage transformer and current transformer by gather voltage and current signal by discretization, the digitlization synchronized sampling of 128, every cycle, obtain real-time voltage and current data.
S301, carries out digital filtering processing by real-time voltage and current data.
S302, carries out discrete Fourier computing to carrying out digital filtering real-time voltage after treatment and current data, calculates amplitude and the angle of voltage, electric current, and proofreaies and correct, and obtains the deal with data of voltage and electric current.
S303, carries out vector calculus by the deal with data of described voltage and electric current, calculates the real-time associated electrical value of supply line.
Described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value.
It should be noted that, the real-time associated electrical value of supply line of acquisition all comprises the associated electrical value of each phase on three-phase.
S304, contrasts described associated electrical value with corresponding default charge value, judge whether to meet the condition of alarm, while being judged as YES, carries out S305, while being judged as NO, and process ends.
It should be noted that, the condition of alarm comprises that described real-time current value exceedes default short circuit current protection definite value, described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, described real-time voltage deviation value exceedes default protection definite value off zero, described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value and/or described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, in described electricity protection, the default protection definite value of each concrete protection project all should set in advance before use, and record storage.
S305, sends alarm signal.
It should be noted that, described alarm signal can be audible and visual alarm signal; Under alarm status, when monitor described associated electrical value be no more than with it corresponding default charge value 95% time, alarm is cancelled automatically.
S306, judges whether to meet the condition of electricity protection, while being judged as YES, carries out S307, while being judged as NO, and process ends.
Described electricity protection comprises short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection.
The condition of described short-circuit protection comprises that described real-time current value exceedes default short circuit current protection definite value, and the duration exceedes the default time delay short-circuit protection time.
The condition of described zero sequence overcurrent protection comprises that described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, and the duration exceedes the default time delay zero sequence overcurrent protection time.
The condition of described overvoltage protection comprises that in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, and the duration exceedes the default time delay overvoltage protection time.
The condition of described under-voltage protection comprises that magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, and the duration exceedes the default time delay under-voltage protection time.
The condition of described open-phase protection comprises that described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, and the duration exceedes the default time delay open-phase protection time.
The condition of described protection off zero comprises that described real-time voltage deviation value exceedes default protection definite value off zero, and the duration exceedes default time delay guard time off zero.
The condition of described single-phase high resistance earthing protecting comprises that described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value, and the duration exceedes the single-phase high resistance earthing protecting time of default time delay.
The condition of described three-phase power balance protection comprises that described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, and the duration exceedes default time delay three-phase power balance guard time.
It should be noted that, in described electricity protection, the default protection definite value of each concrete protection project and default delay protection time all should set in advance before use, and record storage; In addition, user can be according to specific needs carries out any Selection and Constitute configuration, integrated to each concrete protection project in electricity protection one or more, both can adapt to the needs of different occasions, can realize again the general protection to supply line, improves the reliability of electricity consumption.
S307, carries out electricity protection action.
It should be noted that, carry out electricity protection action and be preferably separating brake and cut off supply line, to realize, faulty line or equipment are isolated, prevent from singlely expanding All other routes to electric line or equipment fault and affecting the normal operation of other equipment; In addition, after fault restoration is improved, user can, by the restore electricity powered operation of circuit of closing by hand, also can realize automatic closing action by automatic switching-on device is set.
Fig. 4 is a kind of common transformer of the present invention the 4th embodiment schematic flow sheet of integrated electricity protection method comprehensively, comprising:
S400, by voltage transformer and the public step-down of the parallel access of current transformer are extruded to line end, the public step-down of Real-time Collection extrudes voltage and the current information of line end, obtains real-time voltage and current data.
Preferably, described voltage transformer and current transformer by gather voltage and current signal by discretization, the digitlization synchronized sampling of 128, every cycle, obtain real-time voltage and current data.
S401, carries out digital filtering processing by real-time voltage and current data.
S402, carries out discrete Fourier computing to carrying out digital filtering real-time voltage after treatment and current data, calculates amplitude and the angle of voltage, electric current, and proofreaies and correct, and obtains the deal with data of voltage and electric current.
S403, carries out vector calculus by the deal with data of described voltage and electric current, calculates the real-time associated electrical value of supply line.
Described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value.
It should be noted that, the real-time associated electrical value of supply line of acquisition all comprises the associated electrical value of each phase on three-phase.
S404, contrasts described associated electrical value with corresponding default charge value, judge whether to meet the condition of alarm, while being judged as YES, carries out S405, while being judged as NO, and process ends.
It should be noted that, the condition of alarm comprises that described real-time current value exceedes default short circuit current protection definite value, described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, described real-time voltage deviation value exceedes default protection definite value off zero, described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value and/or described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, in described electricity protection, the default protection definite value of each concrete protection project all should set in advance before use, and record storage.
S405, sends alarm signal.
It should be noted that, described alarm signal can be audible and visual alarm signal; Under alarm status, when monitor described associated electrical value be no more than with it corresponding default charge value 95% time, alarm is cancelled automatically.
S406, judges whether to meet the condition of electricity protection, while being judged as YES, carries out S407, while being judged as NO, and process ends.
Described electricity protection comprises short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection.
The condition of described short-circuit protection comprises that described real-time current value exceedes default short circuit current protection definite value, and the duration exceedes the default time delay short-circuit protection time.
The condition of described zero sequence overcurrent protection comprises that described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, and the duration exceedes the default time delay zero sequence overcurrent protection time.
The condition of described overvoltage protection comprises that in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, and the duration exceedes the default time delay overvoltage protection time.
The condition of described under-voltage protection comprises that magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, and the duration exceedes the default time delay under-voltage protection time.
The condition of described open-phase protection comprises that described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, and the duration exceedes the default time delay open-phase protection time.
The condition of described protection off zero comprises that described real-time voltage deviation value exceedes default protection definite value off zero, and the duration exceedes default time delay guard time off zero.
The condition of described single-phase high resistance earthing protecting comprises that described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value, and the duration exceedes the single-phase high resistance earthing protecting time of default time delay.
The condition of described three-phase power balance protection comprises that described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, and the duration exceedes default time delay three-phase power balance guard time.
It should be noted that, in described electricity protection, the default protection definite value of each concrete protection project and default delay protection time all should set in advance before use, and record storage; In addition, user can be according to specific needs carries out any Selection and Constitute configuration, integrated to each concrete protection project in electricity protection one or more, both can adapt to the needs of different occasions, can realize again the general protection to supply line, improves the reliability of electricity consumption.
S407, carries out electricity protection action.
It should be noted that, carry out electricity protection action and be preferably separating brake and cut off supply line, to realize, faulty line or equipment are isolated, prevent from singlely expanding All other routes to electric line or equipment fault and affecting the normal operation of other equipment
S408, carries out Real-Time Monitoring to the supply line of executed electricity protection action, judges whether to meet the condition of automatic closing, while being judged as YES, carries out S409, while being judged as NO, and process ends.
The condition of described automatic closing comprises that the processed reparation of fault is perfect, circuit breaker is in inputting effective gate-dividing state.
It should be noted that, the condition of described automatic closing also comprises that supply line exceedes default time delay from closing closing time in the duration of separating brake dissengaged positions; The Real-Time Monitoring of the supply line to the action of executed electricity protection is realized by higher level's master controller; in the time that higher level's master controller monitors the processed reparation of fault and improves; can be to Protector for using electricity transmitted signal; Protector for using electricity is further judgement again, and sends corresponding control command according to judged result.
S409, carries out automatic closing action, with the work of restoring electricity.
Fig. 5 is the structural representation of a kind of Protector for using electricity of the present invention.
As shown in Figure 5, a kind of Protector for using electricity of the present invention, the data acquisition module 2, outlet module 3, memory 4 and the display module 5 that comprise main processing block 1 and be connected with described main processing block 1.
Described main processing block 1 is mainly used in integrated, computing and the analyzing and processing of data, obtains real-time associated electrical value, and judges whether to need electricity protection and send corresponding control command according to real-time associated electrical value.
It should be noted that, described main processing block 1 proportion up to the high speed micro-chip processor of 100M as its main operational unit, its fast operation, reliability is high, strong interference immunity; Described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value, the type of its concrete charge value calculating can be set according to actual needs, for example, can arrange and only need calculate magnitude of voltage, current value and zero-sequence current value.
Described main processing block 1 comprises for the data processing unit 11 of data processing, for calculating the computing unit 12 of the real-time associated electrical value of supply line according to described real-time voltage and current data, for judge and issue the electricity protection Logical processing unit 13 of corresponding control command to whether needing to start electricity protection and/or alarm according to real-time associated electrical value.
Described data acquisition module 2 is mainly used in voltage and the current information of the public step-down extrusion of Real-time Collection line end, obtains real-time voltage and current data.
When described outlet module 3 is mainly used in supply line's fault, carry out electricity protection action, cut off supply line.
Described memory 4 is mainly used in event, real-time charge value and predetermined current Value Data to record storage.
The inquiry that described display module 5 is mainly used in inquiry, the definite value of the demonstration of data, each parameter is adjusted and the input of control command.
It should be noted that, the definite value of adjusting by display module 5 or parameter can record storage by memory 4, and the definite value of adjusting or parameter can be default associated electrical value, default delay protection time and default time delay from closing closing time etc.
When use, first by display module 5, each definite value or parameter setting are adjusted, record is stored in memory 4, when work, voltage and current information that data acquisition module 2 extrudes line end to public step-down carry out Real-time Collection, obtain real-time voltage and current data, and this real-time voltage and current data are delivered to main processing block 1, main processing block 1 is processed real-time voltage and voltage data and calculate by data processing unit 11 and computing unit 12, draw the associated electrical value that supply line is real-time, then by electricity protection Logical processing unit 13 according to real-time associated electrical value to whether needing to start electricity protection and judge and issue corresponding control command, in the time that judgement needs electricity protection, send and carry out electricity protection action command to outlet module 3, outlet module 3 is received described instruction and is carried out electricity protection action, to realize, faulty line is isolated, prevent from singlely expanding All other routes to line fault and affecting the normal operation of other equipment, guarantee fail safe and the reliability of electricity consumption.
More preferably, described data acquisition module 2 comprises for the voltage transformer of Real-time Collection information of voltage and for the current transformer of Real-time Collection current information, and the public step-down of the parallel access of described voltage transformer and current transformer extrudes line end; Described outlet module 3 comprises the circuit breaker that cuts off supply line when electricity protection moves for carrying out; Described display module 5 comprises display screen.
Be noted that, described voltage transformer and current transformer by gather voltage and current signal by discretization, the digitlization synchronized sampling of 128, every cycle, obtain real-time voltage and current data, then real-time voltage and current data are sent to main processing block 1 and process, by memory 4, voltage and current data are recorded to storage; Preferably, display screen is touch display screen.
Fig. 6 is another structural representation of a kind of Protector for using electricity of the present invention.
As shown in Figure 6, described Protector for using electricity also comprises the alarm module 6 for sending alarm signal, and described alarm module 6 is connected with main processing block 1; Described alarm module 6 comprises audible-visual annunciator.
It should be noted that, audible-visual annunciator can send audible and visual alarm signal, in the time that supply line breaks down, main processing block 1 can send alarm command to alarm module 6, alarm module 6 is carried out alarm command and is sent audible and visual alarm signal, supply line's fault can be described real-time current value and exceedes default short circuit current protection definite value, described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, described real-time voltage deviation value exceedes default protection definite value off zero, described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value and/or described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, in the time that supply line's trouble duration exceedes the corresponding default time delay electricity protection time, main processing block 1 can send and carry out electricity protection action command to outlet module 3, control circuit breaker and cut off supply line, faulty line is isolated, prevent from singlely expanding All other routes to line fault and affecting the normal operation of other equipment, if and under alarm status, before carrying out electricity protection action, fault automatically terminates, alarm is automatically cancelled and being stopped.
More preferably, described Protector for using electricity also comprise for and higher level's master controller and user side between the communication module 7 of two-way interaction.
It should be noted that, described communication module 7 comprises one or more in carrier communication unit, GPRS communication unit, RS485 communication unit or optical-fibre communications unit, can different communication units be set according to the difference of field of employment, to adapt to all-environment communication need; Meanwhile, higher level's master controller and user side can be realized intelligent remote measurement, remote control, remote signalling and remote regulating by communication module 7.
More preferably, described Protector for using electricity also comprises that described relay module 8 is connected with main processing block 1 for the circuit that closes a floodgate, the relay module 8 that restores electricity; Described relay module 8 comprises relay.
It should be noted that; user manually control relay carries out feed motion; the work of recovery power transmission; also configurable auxiliary equipment makes relay realize automatic closing action; for example, higher level's master controller monitors fault and has repaired while improving, can automatic closing instruction be issued to Protector for using electricity by communication module 7; with control relay automatic closing, recover power transmission work.
More preferably, described Protector for using electricity also comprises the power module 9 for stand-by power supply is provided.
It should be noted that, in the time of load line road local fault or power failure, power module 9 can be each correlation module or device provides power supply, to guarantee the normal operation of Protector for using electricity energy, described load line road local fault can be single phase ground fault, double earthfault, the alternate open circuit fault of two-phase, fault off zero, single-phase open-phase fault and/or two-phase open-phase fault; In addition, power module 9 is provided with lightning protection device, and to avoid it damaged by thunder and lightning, while guaranteeing to load circuit generation local fault, power module 9 can normally be worked, and makes not further expansion of fault, and loss is farthest reduced.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a common transformer integrated electricity protection method comprehensively, its spy is being, is comprising:
By voltage transformer and the public step-down of the parallel access of current transformer are extruded to line end, the public step-down of Real-time Collection extrudes voltage and the current information of line end, obtains real-time voltage and current data;
Described real-time voltage and current data are carried out to data operation processing, obtain the real-time associated electrical value of supply line, described associated electrical value comprises current value, magnitude of voltage, zero-sequence current value, Voltage unbalance degree value, voltage deviation value and/or unbalanced power degree value;
Described associated electrical value is contrasted with corresponding default charge value, judge whether to meet the condition of electricity protection, while being judged as YES, the action of execution electricity protection, described electricity protection comprises short-circuit protection, zero sequence overcurrent protection, overvoltage protection, under-voltage protection, protection off zero, open-phase protection, single-phase high resistance earthing protecting and/or three-phase power balance protection;
The condition of described short-circuit protection comprises that described real-time current value exceedes default short circuit current protection definite value, and the duration exceedes the default time delay short-circuit protection time;
The condition of described zero sequence overcurrent protection comprises that described real-time zero-sequence current value exceedes default zero-sequenceprotection current ration, and the duration exceedes the default time delay zero sequence overcurrent protection time;
The condition of described overvoltage protection comprises that in three-phase, arbitrary mutually described real-time magnitude of voltage exceedes default overvoltage protection voltage definite value, and the duration exceedes the default time delay overvoltage protection time;
The condition of described under-voltage protection comprises that magnitude of voltage real-time described in three-phase is all lower than default under-voltage protection voltage definite value, and the duration exceedes the default time delay under-voltage protection time;
The condition of described open-phase protection comprises that described real-time Voltage unbalance degree value exceedes default open-phase protection definite value and arbitrary mutually described real-time current value is zero, and the duration exceedes the default time delay open-phase protection time;
The condition of described protection off zero comprises that described real-time voltage deviation value exceedes default protection definite value off zero, and the duration exceedes default time delay guard time off zero;
The condition of described single-phase high resistance earthing protecting comprises that described real-time Voltage unbalance degree value exceedes default single-phase high resistance earthing protecting definite value, and the duration exceedes the single-phase high resistance earthing protecting time of default time delay;
The condition of described three-phase power balance protection comprises that described real-time unbalanced power degree value exceedes default three-phase power balance protection definite value, and the duration exceedes default time delay three-phase power balance guard time.
2. comprehensively integrated electricity protection method of common transformer as claimed in claim 1, is characterized in that, the described concrete steps that described real-time voltage and current data are carried out to data operation processing comprise:
Real-time voltage and current data are carried out to digital filtering processing;
Carry out discrete Fourier computing to carrying out digital filtering real-time voltage after treatment and current data, calculate amplitude and the angle of voltage, electric current, and proofread and correct, obtain the deal with data of voltage and electric current;
The deal with data of described voltage and electric current is carried out to vector calculus, calculate the real-time associated electrical value of supply line.
3. common transformer as claimed in claim 1 or 2 integrated electricity protection method comprehensively, is characterized in that, also comprises:
Described associated electrical value is contrasted with corresponding default charge value, judge whether to meet the condition of alarm, while being judged as YES, send alarm signal.
4. common transformer as claimed in claim 1 integrated electricity protection method comprehensively, is characterized in that, also comprises:
Supply line to the action of executed electricity protection carries out Real-Time Monitoring; judge whether to meet the condition of automatic closing; while being judged as YES; the action of execution automatic closing; with the work of restoring electricity, the condition of described automatic closing comprises that the processed reparation of fault is perfect, circuit breaker is in inputting effective gate-dividing state.
5. a Protector for using electricity, is characterized in that, the data acquisition module, outlet module, memory and the display module that comprise main processing block and be connected with described main processing block;
Described main processing block is mainly used in integrated, computing and the analyzing and processing of data, obtains real-time associated electrical value, and judges whether to need electricity protection and send corresponding control command according to real-time associated electrical value;
Described data acquisition module is mainly used in voltage and the current information of the public step-down extrusion of Real-time Collection line end, obtains real-time voltage and current data;
When described outlet module is mainly used in supply line's fault, carry out electricity protection action, cut off supply line;
Described memory is mainly used in event, real-time charge value and predetermined current Value Data to record storage;
The inquiry that described display module is mainly used in inquiry, the definite value of the demonstration of data, each parameter is adjusted and the input of control command;
Described main processing block comprises for the data processing unit of data processing, for calculating the computing unit of the real-time associated electrical value of supply line according to described real-time voltage and current data, for judge and issue the electricity protection Logical processing unit of corresponding control command to whether needing to start electricity protection and/or alarm according to real-time associated electrical value.
6. Protector for using electricity as claimed in claim 5, it is characterized in that, described data acquisition module comprises for the voltage transformer of Real-time Collection information of voltage and for the current transformer of Real-time Collection current information, and the public step-down of the parallel access of described voltage transformer and current transformer extrudes line end;
Described outlet module comprises the circuit breaker that cuts off supply line when electricity protection moves for carrying out;
Described display module comprises display screen.
7. the Protector for using electricity as described in claim 5 or 6, is characterized in that, also comprises the alarm module for sending alarm signal, and described alarm module is connected with main processing block;
Described alarm module comprises audible-visual annunciator.
8. Protector for using electricity as claimed in claim 5, is characterized in that, also comprise for and higher level's master controller and user side between the communication module of two-way interaction.
9. the Protector for using electricity as described in claim 5 or 6 or 8, is characterized in that, also comprises that described relay module is connected with main processing block for the circuit that closes a floodgate, the relay module that restores electricity;
Described relay module comprises relay.
10. the Protector for using electricity as described in claim 5 or 6, is characterized in that, also comprises the power module for stand-by power supply is provided.
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| CN201310139903.3A CN104113047A (en) | 2013-04-22 | 2013-04-22 | Electricity utilization protection method and electricity utilization protection device based on comprehensive integration of public transformers |
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| CN201310139903.3A CN104113047A (en) | 2013-04-22 | 2013-04-22 | Electricity utilization protection method and electricity utilization protection device based on comprehensive integration of public transformers |
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| CN112362978A (en) * | 2020-09-25 | 2021-02-12 | 国网辽宁省电力有限公司大连供电公司 | Three-phase power unbalance rapid detection method and device |
| CN112688275A (en) * | 2020-12-11 | 2021-04-20 | 漳州科华技术有限责任公司 | Inverter protection method and device and terminal equipment |
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| CN114283546A (en) * | 2021-12-27 | 2022-04-05 | 广东电网有限责任公司江门供电局 | Low-voltage outgoing line anti-theft alarm device for transformer |
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