CN114397563A - Online state sensing and diagnosing system for high-voltage circuit breaker - Google Patents
Online state sensing and diagnosing system for high-voltage circuit breaker Download PDFInfo
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- CN114397563A CN114397563A CN202111467420.7A CN202111467420A CN114397563A CN 114397563 A CN114397563 A CN 114397563A CN 202111467420 A CN202111467420 A CN 202111467420A CN 114397563 A CN114397563 A CN 114397563A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The invention discloses a state on-line sensing and diagnosing system of a high-voltage circuit breaker, which comprises the following modules: a. a sensor system: taking the starting point of not influencing the operation safety of the circuit breaker, the signals of the measurement are selected as follows: the device comprises a contact (transmission main shaft) displacement stroke signal, an opening and closing coil current signal, an energy storage motor current signal and an opening and closing auxiliary switch idle contact. According to the invention, the mechanical characteristic parameter of 'the first opening and closing time' after the circuit breaker operates for a long time is detected, and the mechanism state of the circuit breaker is closest to the state when fault current is cut off in operation. Signals in the switching-on and switching-off processes of the high-voltage switch equipment are recorded, the temperature, the pressure and the density of SF6 are monitored in real time, data with higher precision and higher time resolution are provided, the timeliness of the monitored data is improved, and further fault diagnosis and early warning are prepared.
Description
Technical Field
The invention relates to the technical field of high-voltage circuit breakers, in particular to a state online sensing and diagnosing system of a high-voltage circuit breaker.
Background
At present, the on-line monitoring and fault diagnosis of transformer substations and insulation equipment are applied more in China and abroad, but the structure of high-voltage switch-on equipment is complicated, the types of accidents are diversified, and the application of mechanical characteristic on-line monitoring is less, so that no relevant international standard or domestic standard can be found.
The main problems of the traditional mechanical property test are as follows: the measurement mode of the mechanical characteristic parameters of the switch is mainly that during the power failure maintenance of the switch, the maintenance team uses an action characteristic instrument to test on site, the operation is complex, and time and labor are consumed; the mechanical characteristic speed sensors are contact sensors, are complex to install and short in service life, and cannot be installed on equipment during operation; at present, the real-time monitoring of the state of a company high-voltage circuit breaker, particularly the development of a mechanical characteristic live detection means is relatively lagged, the mechanical characteristic acquisition data can not be fused and analyzed on line, and the abnormity diagnosis and early warning of a switch can not be carried out in time. Therefore, a more effective detection method is needed for the working state of the circuit breaker, and potential faults and hidden dangers of the circuit breaker are discovered in time.
In the release of digital transformation and digital power grid construction action schemes and implementation work plans in 2020 by southern power grid companies, digital power transformation is required to be constructed comprehensively, the state perception capability of a high-voltage circuit breaker is improved, and all links of perception, analysis, decision making, service and the like of equipment are opened. The research of the main equipment monitoring key technology is developed, the typical fault defect development characteristics of the main equipment are analyzed, the early fault mode, the defect identification, the active prediction early warning and risk assessment theory are broken through, the equipment state monitoring and fault early warning technical system is continuously perfected, the internet technical front edge is aimed, the technical breakthrough is realized in the aspects of novel energy storage, intelligent equipment, advanced sensing, core equipment and the like, the intelligent inspection and maintenance technology is popularized, the technology is promoted through technological innovation, equipment upgrading and standard formulation, and the safe operation level and the working efficiency of a power grid are improved.
The on-line monitoring technology for the mechanical characteristics of the circuit breaker is a relatively new technical field in China, not only has technical problems, but also relates to the soundness and perfection of corresponding detection and calibration standards and the approval and acceptance of people to new things. The on-line monitoring system can know the working state of the high-voltage switch equipment and the defect position in time, reduce premature or unnecessary power failure tests and overhaul, reduce maintenance workload, reduce maintenance cost, improve the pertinence of overhaul, and can obviously improve the reliability and the economical efficiency of the power system.
Disclosure of Invention
The invention aims to: in order to solve the problems, the invention provides a high-voltage circuit breaker state online sensing and diagnosing system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-voltage circuit breaker state online sensing and diagnosing system comprises the following modules:
a. a sensor system: taking the starting point of not influencing the operation safety of the circuit breaker, the signals of the measurement are selected as follows: the displacement travel signal of a contact (a transmission main shaft), a switching-on and switching-off coil current signal, an energy storage motor current signal, a switching-on and switching-off auxiliary switch idle contact (a switching-off auxiliary idle contact and a switching-on auxiliary idle contact), and the temperature, pressure and density of SF6, the displacement travel signal sampling does not influence the movement of an operating mechanism, the current signal sampling is not directly and electrically connected with a secondary circuit, and the idle contact signal adopts a photoelectric isolation mode;
b. a signal acquisition system: the signal acquisition system comprises sensor interface, signal conditioning and acquisition module, wireless data communication interface, power management module and central processing unit:
travel sensor and interface: the high-precision magnetic grid ruler is attached to the moving position of a contact or a mechanism, the reading head of the sensor is 1-3mm away from the magnetic grid ruler, the magnetic grid ruler is induced to move, the resolution of each grid magnetic grid is 10 mu m, an orthogonal coding signal capable of representing the moving direction is output corresponding to each grid magnetic grid, and the displacement sensor interface identifies the orthogonal coding signal to obtain a displacement stroke-time curve;
divide closing coil current sensor and interface: adopt punching closed loop hall current sensor, when divide closing coil current disconnection, the interior magnetic field energy release of coil produces precipitous back electromotive force at both ends, causes strong electromagnetic radiation, adopts punching closed loop hall current sensor and shields good signal lead and lead wire shielding layer ground connection, eliminates electromagnetic interference, energy storage motor current sensor and interface: the interface is the same as the interface of the opening and closing coil current sensor;
switching value signal interface: a signal lead with good shielding and grounding is adopted to access a pair of opening and closing auxiliary switch idle contacts, and a monitoring unit interface carries out photoelectric isolation and interference suppression to ensure reliable measurement of an idle contact action signal;
SF6 sensor signal interface: the signal is stable, maintenance and recalibration are not needed, a high-precision sensor is arranged, and the SF6 gas state can be measured with constant precision;
wireless communication signal interface: the wireless communication interface is used for data communication between the field detection unit and the substation gateway, can meet the requirement of a power communication private network interface, and can transmit data by adopting a network cable local area network according to the requirement of the substation;
the power supply of the device is accessed: the power is supplied by alternating current 220V, and the power is accessed from a heating auxiliary power supply of the control box or the control cubicle;
the detection unit is designed for preventing wrong insertion: the number of the lead socket core wires is designed in a differentiation mode;
c. data management analysis software: the method comprises the following steps:
and (3) system management: common menu, frequently used function menu, password modification of user, skin modification, interface skin modification, data modification, and user data modification;
personnel management: system accounts, department structure trees added or modified by a system administrator, department management, organization, role management, power collection, system administrator defaulted by the system, ordinary personnel, position management, name and responsibility for defining the position where a user is located, professional management, and profession in the organization;
equipment account management: site management: defining the site name and related information under the department; equipment management: displaying all equipment information under the site;
managing a state library: and (3) state type management: defining different types of states; and (3) managing state values: defining state values under different state types;
rule library management: and (3) rule type management: defining different types of rules; and (3) rule value management: rule values under different rule types are defined.
Preferably, the displacement sensor is provided with a high-precision magnetic grid ruler, the high-precision magnetic grid ruler is wound on the outer surface of the metal ring designed according to the size of the installation position, the distance between the magnetic grid ruler and the sensing reading head is about 2mm, the sensing magnetic grid ruler follows the movement of the transmission main shaft and outputs orthogonal coding pulse signals to reflect the movement of the mechanism and the contact of the circuit breaker.
Preferably, the sensor system comprises the steps of:
s1, sampling a displacement stroke signal, namely mounting a displacement sensor at a crank arm position of a breaker operating mechanism (a mechanism driving main shaft) or a transmission mechanism, measuring a displacement stroke signal of contact movement, and acquiring a stroke-time (S-t) curve;
s2, sampling a coil current signal: using a through Hall current sensor to intervene in a secondary circuit of an operating mechanism, and measuring the current of a switching-on/off coil and the current of an energy storage motor;
s3, auxiliary switch idle contact signal: a pair of idle contacts of the auxiliary switch is accessed into an anti-interference isolation sampling loop of the detection device, and an idle contact state-time curve of the auxiliary switch is obtained;
s4, temperature, pressure and density signals of SF6: the SF6 sensor is divided into a wired sensor and a wireless sensor, and can predict the change trend of the temperature, the pressure and the density of SF6 gas on the basis of monitoring the SF6 gas in real time and early warn abnormal conditions in time.
Preferably, the data management analysis software further comprises: a state comparison function: the method comprises the following steps of analyzing and comparing the action characteristics of a main switch contact (a displacement stroke-time curve of a circuit breaker contact), analyzing and comparing the characteristic parameters of a switching-on and switching-off control loop (a current-time curve of a switching-on and switching-off coil and an idle contact-time curve of an auxiliary switch), analyzing and comparing the characteristic parameters of an energy storage motor (a working current-time curve of the energy storage motor) and analyzing and comparing SF6 gas parameters; analysis and diagnosis functions: analyzing the current change of the secondary element and the SF6 gas parameter change according to the uploaded switch state value and based on a mechanical characteristic curve, calculating parameters which can reflect the mechanical state of the switch equipment, such as contact travel, switch-off and switch-on time, switch-off and switch-on speed and the like, analyzing, comparing and judging whether the transmission system, the secondary element and the gas parameters are abnormal or not, and alarming a fault signal; and inquiring a report function: and (4) arranging the analysis and diagnosis results into a report form format.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
this application is through the mechanical characteristic parameter that detects "when first divide-shut brake" behind the long-term operation of circuit breaker, and state when circuit breaker mechanism state was the closest in service breaking fault current this moment. Signals in the switching-on and switching-off processes of the high-voltage switch equipment are recorded, the temperature, the pressure and the density of SF6 are monitored in real time, data with higher precision and higher time resolution are provided, the timeliness of the monitored data is improved, and further fault diagnosis and early warning are prepared.
Drawings
FIG. 1 is a schematic diagram illustrating a sampling method of a null contact of an auxiliary switch for opening and closing according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hardware framework of a signal acquisition system according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a circuit breaker state monitoring system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution:
the high-voltage circuit breaker state online sensing and diagnosing system comprises the following modules:
a. a sensor system: taking the starting point of not influencing the operation safety of the circuit breaker, the signals of the measurement are selected as follows: the displacement travel signal of contact (transmission main shaft), divide-shut brake coil current signal, energy storage motor current signal, the empty contact of the auxiliary switch that divides the switch (the supplementary empty contact of separating the switch and the supplementary empty contact of combined floodgate), SF 6's temperature, pressure, density, the displacement travel signal sample does not influence the operating mechanism motion, the current signal sample does not take place direct electrical connection with secondary circuit, the empty contact signal adopts the optoelectronic isolation mode, including following step:
s1, sampling a displacement stroke signal, namely mounting a displacement sensor at a crank arm position of a breaker operating mechanism (a mechanism driving main shaft) or a transmission mechanism, measuring a displacement stroke signal of contact movement, and acquiring a stroke-time (S-t) curve;
s2, sampling a coil current signal: using a through Hall current sensor to intervene in a secondary circuit of an operating mechanism, and measuring the current of a switching-on/off coil and the current of an energy storage motor;
s3, auxiliary switch idle contact signal: a pair of idle contacts of the auxiliary switch is accessed into an anti-interference isolation sampling loop of the detection device, and an idle contact state-time curve of the auxiliary switch is obtained;
s4, temperature, pressure and density signals of SF6: the SF6 sensor is divided into a wired sensor and a wireless sensor, and can predict the change trend of the temperature, the pressure and the density of SF6 gas on the basis of monitoring the SF6 gas in real time and early warn abnormal conditions in time;
b. a signal acquisition system: the signal acquisition system comprises sensor interface, signal conditioning and acquisition module, wireless data communication interface, power management module and central processing unit:
travel sensor and interface: the high-precision magnetic grid ruler is attached to the moving position of a contact or a mechanism, the reading head of the sensor is 1-3mm away from the magnetic grid ruler, the magnetic grid ruler is induced to move, the resolution of each grid magnetic grid is 10 mu m, an orthogonal coding signal capable of representing the moving direction is output corresponding to each grid magnetic grid, and the displacement sensor interface identifies the orthogonal coding signal to obtain a displacement stroke-time curve;
divide closing coil current sensor and interface: adopt punching closed loop hall current sensor, when divide closing coil current disconnection, the interior magnetic field energy release of coil produces precipitous back electromotive force at both ends, causes strong electromagnetic radiation, adopts punching closed loop hall current sensor and shields good signal lead and lead wire shielding layer ground connection, eliminates electromagnetic interference, energy storage motor current sensor and interface: the interface is the same as the interface of the opening and closing coil current sensor;
switching value signal interface: a signal lead with good shielding and grounding is adopted to access a pair of opening and closing auxiliary switch idle contacts, and a monitoring unit interface carries out photoelectric isolation and interference suppression to ensure reliable measurement of an idle contact action signal;
SF6 sensor signal interface: the signal is stable, maintenance and recalibration are not needed, a high-precision sensor is arranged, and the SF6 gas state can be measured with constant precision;
wireless communication signal interface: the wireless communication interface is used for data communication between the field detection unit and the substation gateway, can meet the requirement of a power communication private network interface, and can transmit data by adopting a network cable local area network according to the requirement of the substation;
the power supply of the device is accessed: the power is supplied by alternating current 220V, and the power is accessed from a heating auxiliary power supply of the control box or the control cubicle;
the detection unit is designed for preventing wrong insertion: the number of the lead socket core wires is designed in a differentiation mode;
c. data management analysis software: the method comprises the following steps:
and (3) system management: common menu, frequently used function menu, password modification of user, skin modification, interface skin modification, data modification, and user data modification;
personnel management: system accounts, department structure trees added or modified by a system administrator, department management, organization, role management, power collection, system administrator defaulted by the system, ordinary personnel, position management, name and responsibility for defining the position where a user is located, professional management, and profession in the organization;
equipment account management: site management: defining the site name and related information under the department; equipment management: displaying all equipment information under the site;
managing a state library: and (3) state type management: defining different types of states; and (3) managing state values: defining state values under different state types;
rule library management: and (3) rule type management: defining different types of rules; and (3) rule value management: defining rule values under different rule types;
analysis, diagnosis and management: a state comparison function: the method comprises the following steps of analyzing and comparing the action characteristics of a main switch contact (a displacement stroke-time curve of a circuit breaker contact), analyzing and comparing the characteristic parameters of a switching-on and switching-off control loop (a current-time curve of a switching-on and switching-off coil and an idle contact-time curve of an auxiliary switch), analyzing and comparing the characteristic parameters of an energy storage motor (a working current-time curve of the energy storage motor) and analyzing and comparing SF6 gas parameters; analysis and diagnosis functions: analyzing the current change of the secondary element and the SF6 gas parameter change according to the uploaded switch state value and based on a mechanical characteristic curve, calculating parameters which can reflect the mechanical state of the switch equipment, such as contact travel, switch-off and switch-on time, switch-off and switch-on speed and the like, analyzing, comparing and judging whether the transmission system, the secondary element and the gas parameters are abnormal or not, and alarming a fault signal; and inquiring a report function: and (4) arranging the analysis and diagnosis results into a report form format.
The displacement sensor is provided with a high-precision magnetic grid ruler, the high-precision magnetic grid ruler is wound on the outer surface of a metal ring designed according to the size of the installation position, the distance between the magnetic grid ruler and the sensing reading head is about 2mm, the sensing magnetic grid ruler follows the movement of the transmission main shaft and outputs orthogonal coding pulse signals to reflect the movement of a mechanism and a contact of the circuit breaker.
The previous description of the embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. The on-line state sensing and diagnosing system for the high-voltage circuit breaker is characterized by comprising the following modules:
a. a sensor system: taking the starting point of not influencing the operation safety of the circuit breaker, the signals of the measurement are selected as follows: the displacement travel signal of a contact (a transmission main shaft), a switching-on and switching-off coil current signal, an energy storage motor current signal, a switching-on and switching-off auxiliary switch idle contact (a switching-off auxiliary idle contact and a switching-on auxiliary idle contact), and the temperature, pressure and density of SF6, the displacement travel signal sampling does not influence the movement of an operating mechanism, the current signal sampling is not directly and electrically connected with a secondary circuit, and the idle contact signal adopts a photoelectric isolation mode;
b. a signal acquisition system: the signal acquisition system comprises sensor interface, signal conditioning and acquisition module, wireless data communication interface, power management module and central processing unit:
travel sensor and interface: the high-precision magnetic grid ruler is attached to the moving position of a contact or a mechanism, the reading head of the sensor is 1-3mm away from the magnetic grid ruler, the magnetic grid ruler is induced to move, the resolution of each grid magnetic grid is 10 mu m, an orthogonal coding signal capable of representing the moving direction is output corresponding to each grid magnetic grid, and the displacement sensor interface identifies the orthogonal coding signal to obtain a displacement stroke-time curve;
divide closing coil current sensor and interface: adopt punching closed loop hall current sensor, when divide closing coil current disconnection, the interior magnetic field energy release of coil produces precipitous back electromotive force at both ends, causes strong electromagnetic radiation, adopts punching closed loop hall current sensor and shields good signal lead and lead wire shielding layer ground connection, eliminates electromagnetic interference, energy storage motor current sensor and interface: the interface is the same as the interface of the opening and closing coil current sensor;
switching value signal interface: a signal lead with good shielding and grounding is adopted to access a pair of opening and closing auxiliary switch idle contacts, and a monitoring unit interface carries out photoelectric isolation and interference suppression to ensure reliable measurement of an idle contact action signal;
SF6 sensor signal interface: the signal is stable, maintenance and recalibration are not needed, a high-precision sensor is arranged, and the SF6 gas state can be measured with constant precision;
wireless communication signal interface: the wireless communication interface is used for data communication between the field detection unit and the substation gateway, can meet the requirement of a power communication private network interface, and can transmit data by adopting a network cable local area network according to the requirement of the substation;
the power supply of the device is accessed: the power is supplied by alternating current 220V, and the power is accessed from a heating auxiliary power supply of the control box or the control cubicle;
the detection unit is designed for preventing wrong insertion: the number of the lead socket core wires is designed in a differentiation mode;
c. data management analysis software: the method comprises the following steps:
and (3) system management: common menu, frequently used function menu, password modification of user, skin modification, interface skin modification, data modification, and user data modification;
personnel management: system accounts, department structure trees added or modified by a system administrator, department management, organization, role management, power collection, system administrator defaulted by the system, ordinary personnel, position management, name and responsibility for defining the position where a user is located, professional management, and profession in the organization;
equipment account management: site management: defining the site name and related information under the department; equipment management: displaying all equipment information under the site;
managing a state library: and (3) state type management: defining different types of states; and (3) managing state values: defining state values under different state types;
rule library management: and (3) rule type management: defining different types of rules; and (3) rule value management: rule values under different rule types are defined.
2. The system as claimed in claim 1, wherein the displacement sensor is provided with a high-precision magnetic scale, the magnetic scale is wound on the outer surface of the metal ring designed according to the size of the installation position, the distance between the sensing reading head of the magnetic scale and the magnetic scale is about 2mm, the sensing magnetic scale follows the movement of the transmission main shaft and outputs orthogonal coding pulse signals to reflect the movement of the mechanism and the contact of the circuit breaker.
3. The on-line status sensing and diagnostic system for a high voltage circuit breaker according to claim 1, wherein said sensor system comprises the steps of:
s1, sampling a displacement stroke signal, namely mounting a displacement sensor at a crank arm position of a breaker operating mechanism (a mechanism driving main shaft) or a transmission mechanism, measuring a displacement stroke signal of contact movement, and acquiring a stroke-time (S-t) curve;
s2, sampling a coil current signal: using a through Hall current sensor to intervene in a secondary circuit of an operating mechanism, and measuring the current of a switching-on/off coil and the current of an energy storage motor;
s3, auxiliary switch idle contact signal: a pair of idle contacts of the auxiliary switch is accessed into an anti-interference isolation sampling loop of the detection device, and an idle contact state-time curve of the auxiliary switch is obtained;
s4, temperature, pressure and density signals of SF6: the SF6 sensor is divided into a wired sensor and a wireless sensor, and can predict the change trend of the temperature, the pressure and the density of SF6 gas on the basis of monitoring the SF6 gas in real time and early warn abnormal conditions in time.
4. The system of claim 1, wherein the data management analysis software further comprises: a state comparison function: the method comprises the following steps of analyzing and comparing the action characteristics of a main switch contact (a displacement stroke-time curve of a circuit breaker contact), analyzing and comparing the characteristic parameters of a switching-on and switching-off control loop (a current-time curve of a switching-on and switching-off coil and an idle contact-time curve of an auxiliary switch), analyzing and comparing the characteristic parameters of an energy storage motor (a working current-time curve of the energy storage motor) and analyzing and comparing SF6 gas parameters; analysis and diagnosis functions: analyzing the current change of the secondary element and the SF6 gas parameter change according to the uploaded switch state value and based on a mechanical characteristic curve, calculating parameters which can reflect the mechanical state of the switch equipment, such as contact travel, switch-off and switch-on time, switch-off and switch-on speed and the like, analyzing, comparing and judging whether the transmission system, the secondary element and the gas parameters are abnormal or not, and alarming a fault signal; and inquiring a report function: and (4) arranging the analysis and diagnosis results into a report form format.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116088487A (en) * | 2023-04-11 | 2023-05-09 | 湖南长长电泵科技有限公司 | Emergency monitoring device for water pump controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116088487A (en) * | 2023-04-11 | 2023-05-09 | 湖南长长电泵科技有限公司 | Emergency monitoring device for water pump controller |
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