CN210167808U - 10kV cubical switchboard secondary element real-time supervision protection device - Google Patents
10kV cubical switchboard secondary element real-time supervision protection device Download PDFInfo
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- CN210167808U CN210167808U CN201921472224.7U CN201921472224U CN210167808U CN 210167808 U CN210167808 U CN 210167808U CN 201921472224 U CN201921472224 U CN 201921472224U CN 210167808 U CN210167808 U CN 210167808U
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Abstract
The utility model discloses a 10kV switch cabinet secondary element real-time monitoring protection device, which comprises a CPU, a closed-loop Hall sensor, a volt-ampere resistance measuring unit, an outlet relay, an LCD screen, a keyboard, a communication interface and a power module; the closed-loop Hall sensor is used for measuring the direct current in the loop; the volt-ampere resistance measuring unit is used for measuring the resistance of the coil; the CPU is respectively and electrically connected with the closed-loop Hall sensor, the volt-ampere resistance measuring unit, the outlet relay, the LCD screen, the keyboard and the communication interface; the power supply module is used for supplying power. The 10kV switch cabinet secondary element real-time monitoring protection device optimizes a secondary loop framework, avoids the loop from excessively relying on a travel switch contact, and reduces the damage probability of coil elements; the troubleshooting speed is accelerated. When the device is operated, the adhesion or switching abnormality of the switch travel switch contact can be determined, or the circuit breaker operating mechanism is blocked.
Description
Technical Field
The utility model belongs to the technical field of the electric power safety, especially, relate to a 10kV cubical switchboard secondary element real-time supervision protection device.
Background
In an electric power system, the perfection of a secondary circuit is the basis for the normal operation of equipment and the correct action of a protection device, and the perfection of components is the basis. The integrity of the secondary circuit can be ensured by correct wiring and no falling, but the integrity of the normal operation of the components is difficult to ensure. The secondary circuit of the 10kV switch cabinet is simple in structure and low in reliability, components are damaged at high frequency, and particularly relevant auxiliary contacts in a switch mechanism are arranged. The existing opening and closing circuit is connected with the switch stroke auxiliary contacts in series, and after the switch is in place, the opening and closing circuit is disconnected through the contacts. Once these contacts are jammed and sticky, the switching-on and switching-off coil is electrified and heated for a long time, and finally the coil is burnt out, and the switch cannot be normally switched on and switched off. Similarly, in the energy storage loop, the energy storage motor is often burnt out due to long-term electrification and heating caused by the jamming and adhesion of the energy storage stroke auxiliary contact. Aiming at the problems that a secondary circuit framework of a 10kV switch cabinet is simple, and a switching-on and switching-off coil and an energy storage motor are prone to being electrified and generate heat for a long time after components are damaged, a certain measure needs to be taken to correct the secondary circuit framework of the 10kV switch cabinet, and damage to coil elements caused by jamming and adhesion of auxiliary contacts is avoided. At present, most switch cabinet manufacturers increase the open points of the circuits by connecting multiple related stroke contacts in series on the original circuits, so that the protection of the coils and the motors is improved.
By adopting the measures to modify the loop, the requirement of the loop on the travel switch contact is increased, the spare contacts are reduced, which means that the whole travel switch may need to be replaced when a certain contact is damaged, and the defect eliminating workload is increased. In addition, if the travel switch is not in place due to the jamming of the switch mechanism, the states of all the contacts on the travel switch cannot be changed, and the loop is electrified for a long time to generate heat to burn out the coil and the motor.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, a secondary circuit framework is optimized by developing a 10kV switch cabinet secondary element real-time monitoring protection device, so that the loop is prevented from being excessively dependent on a travel switch contact, and the damage probability of coil elements is reduced.
To achieve the purpose, the utility model adopts the following technical proposal:
the 10kV switch cabinet secondary element real-time monitoring protection device comprises a CPU, a closed-loop Hall sensor, a volt-ampere resistance measuring unit, an outlet relay, an LCD screen, a keyboard, a communication interface and a power module;
the closed-loop Hall sensor is used for measuring the direct current in the loop;
the volt-ampere resistance measuring unit is used for measuring the resistance of the coil;
the CPU is respectively and electrically connected with the closed-loop Hall sensor, the volt-ampere resistance measuring unit, the outlet relay, the LCD screen, the keyboard and the communication interface;
the power supply module is used for supplying power.
Optionally, the 10kV switch cabinet secondary element real-time monitoring protection device further comprises two a/D modules;
the closed-loop Hall sensor and the volt-ampere resistance measuring unit are respectively connected with the CPU through the A/D module.
Optionally, the 10kV switch cabinet secondary element real-time monitoring protection device further comprises an amplifying circuit;
the closed-loop Hall sensor is connected to the input end of the amplifying circuit, and the output end of the amplifying circuit is connected to the A/D module.
Optionally, the volt-ampere resistance measuring unit comprises a voltage signal collecting unit and a direct current controllable constant current source;
the direct current controllable constant current source is connected in series at two ends of the coil; the voltage signal acquisition units are arranged at two ends of the coil in parallel;
the output end of the voltage signal acquisition unit is connected with the A/D module;
the direct current controllable constant current source is connected to the CPU.
Optionally, the 10kV switchgear secondary element real-time monitoring protection device further includes an alarm element, and the alarm element is connected to the CPU.
Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:
the embodiment of the utility model provides a 10kV cubical switchboard secondary component real-time supervision protection device has optimized the secondary circuit framework, avoids the excessive dependence of return circuit to the travel switch contact, reduces coil class component and damages the probability; the speed of troubleshooting is accelerated, and as long as the device acts, the adhesion or switching abnormity of the contact of the switch travel switch can be determined, or the operating mechanism of the circuit breaker is blocked.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is the embodiment of the utility model provides a 10kV cubical switchboard secondary element real-time supervision protection device's structure chart.
Fig. 2 is a measurement structure diagram of the closed-loop hall sensor provided in the embodiment of the present invention.
Fig. 3 is a measurement structure diagram of the volt-ampere resistance measurement unit provided by the embodiment of the present invention.
Fig. 4 is a flowchart of a control procedure according to an embodiment of the present invention.
Fig. 5 is a control logic diagram according to an embodiment of the present invention.
Fig. 6 is an electrical schematic diagram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 to 3, the present embodiment provides a 10kV switch cabinet secondary element real-time monitoring protection device, which includes a CPU13, a closed loop hall sensor 10, a volt-ampere resistance measurement unit 11, an outlet relay 12, an LCD screen 15, a keyboard 16, a communication interface 17, and a power module 14.
The closed-loop hall sensor 10 is used for measuring the magnitude of a direct current in a loop. Specifically, the closed-loop Hall sensor can measure current with any waveform, absolute electrical isolation between a main coil and an auxiliary coil, wide electrical measurement range and short response time, and can be applied to alternating current and direct current measurement.
The volt-ampere resistance measuring unit 11 is used for measuring the coil resistance.
The CPU13 is electrically connected to the closed-loop hall sensor 10, the volt-ampere resistance measuring unit 11, the outlet relay 12, the LCD screen 15, the keypad 16 and the communication interface 17, respectively.
The power module 14 is used for supplying power.
The 10kV switch cabinet secondary element real-time monitoring protection device further comprises two A/D modules.
The closed-loop hall sensor 10 and the volt-ampere resistance measuring unit 11 are respectively connected with the CPU13 through one a/D module.
The 10kV switch cabinet secondary element real-time monitoring protection device further comprises an amplifying circuit 18.
The closed-loop hall sensor 10 is connected to the input end of the amplifying circuit 18, and the output end of the amplifying circuit 18 is connected to the a/D module.
The volt-ampere resistance measuring unit 11 comprises a voltage signal acquisition unit 19 and a direct current controllable constant current source 20.
The direct current controllable constant current source 20 is connected in series at two ends of the coil; the voltage signal acquisition units 19 are arranged in parallel at two ends of the coil.
The output end of the voltage signal acquisition unit 19 is connected to the A/D module.
The dc controllable constant current source 20 is connected to the CPU 13.
In the volt-ampere resistance measuring unit 11, the measuring voltage is provided by the voltage signal acquisition unit 19, and after a/D conversion, the measuring voltage and the current amount provided by the direct current controllable constant current source 20 participate in the calculation of the CPU13 (R ═ U/I), so as to monitor the coil resistance in real time. The CPU13 controls the CK contact to turn on and off the voltammetry resistance measurement unit 11.
The 10kV switch cabinet secondary element real-time monitoring protection device further comprises an alarm element, and the alarm element is connected to the CPU 13.
Please refer to fig. 4 to 6.
The embodiment further provides a flowchart of a control procedure of the protection device.
Specifically, the main program responds to external interruption according to a fixed period, and analog quantity sampling, device hardware self-checking, logic judgment, real-time resistance value and the like are calculated in the interruption service program. And entering an exit program or a normal operation program according to whether the starting condition is met.
And the normal operation program carries out self-checking of the device, and the device sends out an alarm signal when abnormal to remind operation and maintenance personnel to inform team personnel to carry out corresponding treatment. And performing algorithm calculation and logic judgment in the exit program, and triggering the exit relay 12 to act when the conditions are met.
Starting an element flow:
when the closed-loop Hall sensor 10 in the loop senses current, the current amount is calculated after being converted by the A/D module, and when the current amount reaches a starting fixed value, exit program judgment is carried out.
The flow of action elements:
after the starting element is started, the resistance measurement is quitted and the outlet relay 12 is triggered to act after a certain time delay, the continuous current loop is disconnected, and the alarm element is started.
And (3) alarm element flow:
when the action element acts or the resistance value reaches a critical value, the alarm element acts, namely, the alarm is responded.
Therefore, the function realization principle of the 10kV switch cabinet secondary element real-time monitoring protection device is as follows:
when the open (close) coil loop has current, the closed-loop hall sensor 10 measures the magnitude of the current. When the current is larger than the current starting value, the device starts timing, simultaneously disconnects the contact CK, exits the resistance measuring unit, and avoids large current from flowing through the volt-ampere resistance measuring unit 11 for a long time so as to avoid damage. If the contact of the switch travel switch is adhered or abnormally switched, or the operating mechanism of the circuit breaker is blocked, at the moment, because the current of the self-holding loop in the protection device can not be automatically cut off, when the duration time of the current reaches the time setting value of the device, the outlet relay 12CK1(CK2) of the device is triggered to act, so that the corresponding normally closed contact CK1(CK2) is cut off, the opening (closing) loop is cut off, the self-holding loop in the protection device is returned, the opening (closing) coil is prevented from being electrified for a long time, heated and burnt, and a corresponding alarm signal is uploaded to a monitoring background through the device communication interface 17.
In conclusion, the 10kV cubical switchboard secondary element real-time supervision protection device that this embodiment provided has following advantage:
(1) the original circuit of the 10kV switch cabinet opening and closing is a physical judgment principle that the circuit is disconnected after the switch stroke is in place. The 10kV switch cabinet secondary element real-time monitoring protection device is additionally provided with electric judgment on the basis, and the excessive dependence of a switching-on and switching-off loop on the switch stroke is avoided.
(2) The introduction of the 10kV switch cabinet secondary element real-time monitoring protection device accelerates the troubleshooting speed. When the device is operated, the adhesion or switching abnormality of the switch travel switch contact can be determined, or the circuit breaker operating mechanism is blocked.
(3) The real-time resistance measuring function in the 10kV switch cabinet secondary element real-time monitoring protection device can ensure that the resistance value of the coil can be monitored. When the resistance value of the coil reaches the critical value, the device sends a corresponding alarm signal (low resistance or high resistance), operation and maintenance personnel are brought to notice, and the overhaul team is informed to replace the coil in time, so that the phenomenon that the resistance of the coil is too low, the opening and closing current is large, an operation panel of the protection device is burnt out, or the resistance of the coil is too high, the opening and closing current is small, the attraction force of the coil is insufficient, and the switch is rejected is avoided.
(4) The 10kV switch cabinet secondary element real-time monitoring protection device is realized by integrating electronic elements, and the electronic elements have the advantages of small volume, high reliability, high response speed, high precision and the like.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being "on" … … "," engaged with "… …", "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected to or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on … …," "directly engaged with … …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as "inner," "outer," "below," "… …," "lower," "above," "upper," and the like, may be used herein for ease of description to describe a relationship between one element or feature and one or more other elements or features as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below … …" can encompass both an orientation of facing upward and downward. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
- The 1.10kV switch cabinet secondary element real-time monitoring protection device is characterized by comprising a CPU, a closed-loop Hall sensor, a volt-ampere resistance measuring unit, an outlet relay, an LCD screen, a keyboard, a communication interface and a power module;the closed-loop Hall sensor is used for measuring the direct current in the loop;the volt-ampere resistance measuring unit is used for measuring the resistance of the coil;the CPU is respectively and electrically connected with the closed-loop Hall sensor, the volt-ampere resistance measuring unit, the outlet relay, the LCD screen, the keyboard and the communication interface;the power supply module is used for supplying power.
- 2. The 10kV switchgear secondary component real-time monitoring protection device according to claim 1, further comprising two A/D modules;the closed-loop Hall sensor and the volt-ampere resistance measuring unit are respectively connected with the CPU through the A/D module.
- 3. The real-time monitoring and protecting device for secondary elements of the 10kV switch cabinet according to claim 2, characterized by further comprising an amplifying circuit;the closed-loop Hall sensor is connected to the input end of the amplifying circuit, and the output end of the amplifying circuit is connected to the A/D module.
- 4. The 10kV switchgear secondary element real-time monitoring protection device according to claim 3, wherein the volt-ampere resistance measuring unit comprises a voltage signal acquisition unit and a direct current controllable constant current source;the direct current controllable constant current source is connected in series at two ends of the coil; the voltage signal acquisition units are arranged at two ends of the coil in parallel;the output end of the voltage signal acquisition unit is connected with the A/D module;the direct current controllable constant current source is connected to the CPU.
- 5. The 10kV switchgear secondary component real-time monitoring protection device according to claim 4, further comprising an alarm element, wherein the alarm element is connected to the CPU.
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| CN201921472224.7U CN210167808U (en) | 2019-09-05 | 2019-09-05 | 10kV cubical switchboard secondary element real-time supervision protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110492443A (en) * | 2019-09-05 | 2019-11-22 | 广东电网有限责任公司 | 10kV switchgear secondary component real-time monitoring protective device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110492443A (en) * | 2019-09-05 | 2019-11-22 | 广东电网有限责任公司 | 10kV switchgear secondary component real-time monitoring protective device |
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