CN113866534A - Secondary circuit signal detection system - Google Patents
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- CN113866534A CN113866534A CN202110983028.1A CN202110983028A CN113866534A CN 113866534 A CN113866534 A CN 113866534A CN 202110983028 A CN202110983028 A CN 202110983028A CN 113866534 A CN113866534 A CN 113866534A
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- G—PHYSICS
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- 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
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- G—PHYSICS
- 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 relates to a secondary loop signal detection system. The secondary loop signal detection system comprises at least one slave machine and a master machine. The secondary circuit signal detection system can be used for detecting whether the outlet contact of the relay protection device acts or not and detecting the action time of the outlet contact of the relay protection device, so that the reliability of outlet circuit verification of a protection function is improved.
Description
Technical Field
The invention relates to the technical field of detection relay protection devices, in particular to a secondary loop signal detection system.
Background
In the inspection and acceptance, comprehensive transformation and periodic inspection of a new station of a transformer substation, an outlet loop with a protection function needs to be verified. The currently used method is to measure the ground with a multimeter or to verify the outlet platen with the open interface of the relay protection tester.
However, the above-mentioned verification method can only be used to detect whether the potential of the outlet platen changes, and therefore the verification result obtained by the above-mentioned method is not reliable.
Disclosure of Invention
Accordingly, it is necessary to provide a secondary loop signal detection system having high reliability.
A secondary loop signal detection system comprising:
the slave machine comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for detecting the voltages at two ends of an outlet contact corresponding to the relay protection device and outputting a first control signal corresponding to the outlet contact under the condition that the voltages at two ends of the outlet contact are consistent;
and the master machine comprises a second control unit which is in communication connection with at least one slave machine, and the second control unit is used for starting timing when receiving a trigger signal of a protection action and finishing timing when receiving the first control signal to obtain action time corresponding to the outlet contact.
In one embodiment, the slave machine comprises a first input end and a second input end, wherein the first input end is used for being electrically connected with a first end of an outlet contact of the relay protection device, and the second input end is used for being electrically connected with an outlet pressing plate of the relay protection device; the first end of the outlet contact is electrically connected with the control power supply, and the second end of the outlet contact is electrically connected with the outlet pressing plate.
In one embodiment, the trigger signal of the protection action is an open signal generated synchronously when the relay protection tester outputs a fault signal to the relay protection device.
In one embodiment, the host further comprises a third input terminal and a fourth input terminal, the third input terminal is used for being electrically connected with the first end of the open contact of the relay protection tester, and the fourth input terminal is used for being electrically connected with the second end of the open contact of the relay protection tester; the second control unit is further used for starting timing when the first end and the second end of the open contact of the relay protection tester are closed and conducted.
In one embodiment, the host computer includes an input unit for receiving a start test instruction.
In one embodiment, the slave further includes a first wireless unit, the first wireless unit is connected to the first control unit, and the first wireless unit is configured to receive the first control signal and send the first control signal; the host also comprises a second wireless unit which is connected with the second control unit and is used for receiving the first control signal sent by the first wireless unit and outputting the first control signal to the second control unit.
In one embodiment, the first control unit is a single chip microcomputer, and/or the second control unit is a central processing unit.
In one embodiment, the slave further includes an indication unit, the indication unit is connected to the output end of the first control unit, and the indication unit is configured to indicate under the control of the first control unit when the voltages at the two corresponding outlet contacts are consistent.
In one embodiment, the host further comprises a storage unit.
In one embodiment, the slave enclosure is provided with a magnet and/or the master enclosure is provided with a magnet.
The secondary circuit signal detection system comprises at least one slave machine and a master machine, wherein the master machine is in communication connection with the at least one slave machine, the master machine starts timing when receiving a trigger signal of a protection action and finishes timing when receiving a first control signal of the slave machine, and the first control signal is used for indicating the outlet contact of the relay protection device to be closed, so that the master machine can obtain the time from the protection action to the actual outlet action corresponding to the outlet contact, and the secondary circuit signal detection system not only can be used for detecting whether the outlet contact of the relay protection device acts, but also can detect the action time of the outlet contact of the relay protection device, and the reliability of outlet circuit verification of a protection function is improved.
Meanwhile, the host can be in communication connection with the slave machines, so that the host can obtain a plurality of first control signals corresponding to the slave machines, namely the host can obtain a plurality of action times corresponding to the outlet contacts of the relay protection device, and relay protection personnel can finish the examination of the action times of the outlet loops only by triggering the relay protection device to perform protection action once, thereby improving the field debugging efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of an outlet loop of a relay protection device;
FIG. 2 is a schematic diagram of a secondary loop signal detection system according to an embodiment;
FIG. 3 is a schematic structural diagram of the slave in FIG. 2;
FIG. 4 is a schematic diagram of the structure of the host computer in FIG. 2;
fig. 5 is a schematic structural diagram of a secondary loop signal detection system in another embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
The relay protection device is an automatic device which can reflect the fault or abnormal operation state of the electric elements in the power system and act on a breaker to trip or send a signal. If the electric element is abnormal in operation state, the relay protection device can send a signal to remind an operator to pay attention; if the electric element has a fault, the relay protection device acts on the switch to trip, so that the fault part is isolated from the rest normal operation parts in the system, and the stable and reliable operation of the system is ensured.
When a relay protection professional in an electric power system debugs and examines secondary equipment of a plurality of outlets such as a relay protection device and a safety automation device, the correctness of all the outlets needs to be tested under the same logic, the testing of the correctness of all the outlets comprises testing the sequence and time of all the outlets, and if the sequence and time of the outlets are incorrect, the outlets are mistakenly exported, so that a large-area power failure accident is caused.
As shown in fig. 1, when a fault occurs in the relay protection device, the outlet contact of the relay protection device and the outlet pressing plate corresponding to the outlet contact are connected in series in the operation circuit of the circuit breaker, and the two terminals of the outlet contact corresponding to the fault are closed and conducted in the relay protection device, thereby controlling the circuit breaker to trip. It should be noted that, the analog device may be used to input an analog fault signal, which is greater than the setting value of the relay protection device, so as to trigger the action of the relay protection device.
At present, the potential change of an outlet pressure plate of a relay protection device is mainly measured by a multimeter so as to test the correctness of all outlets. The universal meter selects a direct-current gear, the meter pen of the black test line is grounded, the meter pen of the red test line is in contact with the metal part of the lower opening of the pressing plate, a simulation device is used for inputting a simulation fault signal to the relay protection device, and one end of the meter pen of the universal meter is used for measuring and observing the potential change of the lower opening of the pressing plate. For relay protection devices with a plurality of outlets, in order to verify the correctness of outlet logic after a certain protection action, a simulation device needs to be repeatedly utilized to simulate the fault amount n (n is the number of outlet contact actions corresponding to one protection action) corresponding to the protection, and the potential change of one outlet pressure plate needs to be measured and observed when the fault amount simulation is carried out once until the n outlet pressure plates are measured. The above test methods are very labor intensive.
The testing method comprises the steps of collecting and measuring the voltage to ground of a lower opening of an outlet pressing plate, judging whether the voltage to ground is larger than a reference voltage or not, and judging whether an outlet contact corresponding to the outlet pressing plate acts or not. The test equipment capable of realizing the test method is complex and has higher requirement on the reliability of the equipment.
Meanwhile, the two schemes are both used for measuring the voltage to ground of the outlet pressing plate, and when an element is damaged in the testing device, the whole station direct current grounding of the tested transformer substation is caused, and the risk is high.
In view of this, an embodiment of the present invention provides a secondary loop signal detection system, which includes at least one slave and a master, where the master is in communication connection with the at least one slave, and the master starts timing when receiving a trigger signal of a protection operation and ends timing when receiving a first control signal of the slave, where the first control signal is used to instruct an outlet contact of a relay protection device to be closed, so that the master can obtain a time from the protection operation to an actual outlet operation corresponding to the outlet contact.
Furthermore, the host can be in communication connection with the multiple slaves, so that the host can obtain multiple first control signals corresponding to the slaves, namely the host can obtain multiple action times corresponding to the outlet contacts of the relay protection device, and a relay protection worker can finish the examination of the action times of multiple outlet loops only by triggering the relay protection device to perform one protection action, so that the field debugging efficiency is improved, and the workload of the relay protection worker is reduced.
Still further, the slave machine of the embodiment of the present application determines whether the outlet contact is actuated by detecting the voltages at the two ends of the outlet contact, and does not need to detect the voltage to ground of the outlet pressure plate and compare the voltage to ground with the reference voltage.
Referring to fig. 2, a schematic structural diagram of a secondary loop signal detection system according to an embodiment of the present disclosure is shown, where the secondary loop signal detection system 200 may include a master 210 and a slave 220. Specifically, the slave 220 includes a first control unit 222, and the first control unit 222 is configured to detect voltages at two ends of an outlet contact corresponding to the relay protection device, and output a first control signal corresponding to the outlet contact when the voltages at the two ends of the outlet contact are identical. The master 210 includes a second control unit 212, the second control unit 212 is in communication connection with at least one slave 220, and the second control unit 212 is configured to start timing when receiving a trigger signal of a protection operation, and end timing when receiving a first control signal, so as to obtain an operation time corresponding to an exit contact.
It should be noted that the secondary loop detection system 200 includes at least one slave 220. Alternatively, the number of the secondary circuit detection system slaves may be the same as the number of the outlet pressure plates of the relay protection device. Optionally, the number of slave machines of the secondary circuit detection system may be the same as the number of outlet contacts corresponding to the protection action of the relay protection device, so that whether all the outlet contacts corresponding to the protection action act can be measured by triggering the relay protection device once, the workload of relay protection operators is greatly reduced, the problems of insufficient tolerance and low personnel utilization rate are solved, meanwhile, no redundant slave machines exist, and the cost of the secondary circuit detection system is reduced.
Optionally, the first control unit obtains voltages at two ends of an outlet contact corresponding to the relay protection device, compares the voltages at two ends of the outlet contact, and outputs a first control signal corresponding to the outlet contact when the voltages at two ends of the outlet contact are consistent. Therefore, when the two ends of the corresponding outlet contact are closed and conducted, the first control unit outputs a first control signal corresponding to the outlet contact, and the first control signal can reflect the action of the outlet contact.
The trigger signal of the protection operation is a signal that can reflect the time point of triggering the operation of the relay protection device, and as described above, the analog device outputs a signal generated synchronously with the analog fault signal, and the synchronously generated signal can reflect the time point of outputting the analog fault signal by the analog device and inputting the analog fault signal to the relay protection device. Note that the first control signal is a signal generated in synchronization with the operation of the outlet contact. Therefore, the second control unit can obtain the time from the protection operation to the actual outlet operation corresponding to the outlet contact, thereby realizing the detection of the operation time of the outlet contact of the relay protection device.
Optionally, the second control unit is in communication connection with the first control unit of the at least one slave. Optionally, the second control unit establishes a short-range communication connection with at least one slave. Alternatively, the short-range communication may be WiFi.
It should be noted that, in the case that the secondary circuit signal detection system includes a plurality of slaves, the master may identify which slave has generated the first control signal, and the first control unit of the slave is configured to detect the voltages at the two ends of the outlet contact corresponding to the relay protection device, so that the master may know the operation times corresponding to the plurality of outlet contacts. It should be noted that the timing start point of each exit contact is a time point at which the second control unit receives the trigger signal of the protection operation, and the timing end point is a time point at which the second control unit receives the first control signal corresponding to the exit contact.
The embodiment of the application provides a secondary circuit signal detection system, which comprises at least one slave machine and a host machine, wherein the host machine is in communication connection with the at least one slave machine, the host machine starts timing when receiving a trigger signal of a protection action and finishes timing when receiving a first control signal of the slave machine, and the first control signal is used for indicating the outlet contact of a relay protection device to be closed, so that the host machine can obtain the time from the protection action to the actual outlet action corresponding to the outlet contact, and the secondary circuit signal detection system can be used for detecting whether the outlet contact of the relay protection device acts or not and detecting the action time of the relay protection device, thereby improving the reliability of outlet circuit verification of a protection function.
Meanwhile, the secondary circuit signal detection system comprises at least one slave machine, so that the potential change and the action time of the outlet pressing plates with the same number as that of the slave machines can be measured every time fault quantity simulation is carried out, and the workload is reduced. Moreover, the slave machine of the embodiment of the application judges whether the outlet contact acts or not through the detected voltages at two ends of the outlet contact, does not need to detect the voltage to ground of the outlet pressing plate and compares the voltage to ground with the reference voltage, so that the secondary circuit signal detection system provided by the embodiment of the application has the advantages of low detection risk, simple detection equipment and low requirement on the reliability of the detection equipment, and can solve the problems of insufficient hands and low utilization efficiency of personnel.
Please refer to fig. 3, which illustrates a schematic structural diagram of a slave according to an embodiment of the present application. The slave 220 comprises a first control unit 222, a first input 302 and a second input 304. Specifically, the first input terminal 302 is used for electrically connecting a first terminal 306 of an outlet contact of the relay protection device, and the second input terminal 304 is used for electrically connecting an outlet pressure plate 308 of the relay protection device. As shown in fig. 3, a first end 306 of the outlet contact is electrically connected to a controllable power source and a second end 310 of the outlet contact is electrically connected to an outlet pressure plate 308.
Optionally, the first control unit is electrically connected to the first input end, the first control unit is electrically connected to the second input end, and the second input end is used for electrically connecting to the first end of the outlet pressing plate of the relay protection device. As shown in FIG. 3, the first end 312 of the outlet platen is the end of the outlet platen that is connected to the second end 310 of the outlet junction. The first control unit can thus obtain the voltage signal at the first end of the outlet connection via the first input terminal and the voltage signal at the second end of the outlet connection via the second input terminal, so that the first control unit can obtain the voltage signals at the first end of the outlet connection and at the second end of the outlet connection. It should be noted that the relay protection device may be installed in a relay protection cabinet, and a plurality of piles are provided in the relay protection cabinet. Some of the piles correspond to the first end of the outlet contact, and some of the piles correspond to the first end of the outlet pressure plate, so that the first input end and the second input end are connected with the corresponding piles, and the first control unit can obtain voltage signals of the first end of the outlet contact and the second end of the outlet contact.
According to the slave provided by the embodiment, the voltage signals of the first end of the outlet contact and the second end of the outlet contact are compared, and the first control signal is output under the condition that the voltages of the first end and the second end of the outlet contact are consistent, so that the voltage to ground of the outlet pressure plate does not need to be acquired, and the reference voltage does not need to be provided, therefore, the detection risk of the secondary circuit signal detection system is reduced, meanwhile, the detection equipment is simple, and the requirement on the reliability of the detection equipment is low.
With continued reference to fig. 3, the slave may also include an indication unit 314. Specifically, the indication unit 314 is connected to the output end of the first control unit 222, and the indication unit 314 is used for indicating under the control of the first control unit 222 when the voltages at the two ends of the corresponding outlet contact are consistent. Optionally, the first control unit may control the operating state of the indicating unit, that is, the first control unit may control the indicating unit to indicate. Optionally, the first control unit may control whether the power supply loops of the indication unit and the indication unit are conducted. Alternatively, the indicating unit may be an indicator lamp or an alarm. The above embodiment can make things convenient for relay protection personnel to know whether the corresponding outlet contact acts or not through setting up the indicating unit.
Referring to fig. 4, which shows a schematic structural diagram of a host provided in an embodiment of the present application, the host 210 may include a second control unit 212, a third input terminal 402, and a fourth input terminal 404.
It should be noted that the third input end 402 and the fourth input end 404 are used to obtain a trigger signal of the protection action, and the second control unit 212 can know whether the relay protection device is triggered according to the input signals of the third input end 402 and the fourth input end 404. Optionally, the second control unit is electrically connected to the third input end, the second control unit is electrically connected to the fourth input end, and the third input end and the fourth input end may be electrically connected to the analog device to obtain the trigger signal of the protection action.
In an optional embodiment of the present application, the relay protection tester is adopted to input an analog fault signal to the relay protection device, and then the trigger signal of the protection action is an output signal generated synchronously when the relay protection tester outputs the fault signal to the relay protection device. It should be noted that the trigger signal of the protection operation may reflect a time point when the relay protection tester outputs the fault signal to the relay protection device, that is, may reflect a time point when the relay protection device receives the fault signal. Optionally, the relay protection tester is configured so that when the relay protection tester outputs a fault signal to the relay protection device, the preset open contact is closed and conducted, and a signal that reflects the closed and conducted open contact can be used as a trigger signal of the protection action.
In an alternative embodiment of the present application, the third input terminal is configured to be electrically connected to a first terminal of the open contact of the relay protection tester, and the fourth input terminal is configured to be electrically connected to a second terminal of the open contact of the relay protection tester. It should be noted that the first end of the open contact and the second end of the open contact are closed and conducted when the relay protection tester outputs the fault signal, and the second control unit starts timing when the first end and the second end of the open contact of the relay protection tester are closed and conducted. Optionally, when the open contact is closed and conducted, voltages of the first end and the second end of the open contact are consistent, so that the second control unit can judge whether the relay tester outputs a fault signal to the relay protection device by comparing whether voltage signals of the first end and the second end of the open contact are consistent, and the second control unit starts timing when the voltage signals of the first end and the second end are consistent. In the embodiment, the voltages at the two ends of the outlet contact of the relay protection tester are obtained, and whether the timing is started or not is controlled by judging whether the voltages at the two ends are consistent or not, so that the real-time performance of timing can be ensured, and the reliability of timing the action time of the outlet contact is improved.
With continued reference to fig. 4, the host may also include an input unit 406. In particular, the input unit may be configured to receive a start test instruction. The relay protection personnel control the secondary loop signal detection system to start testing through the input unit 406. Optionally, the second control unit is connected to the input unit, and when the input unit receives the start test instruction, the start test instruction is sent to the second control unit, the host enters a working state, and sends the start test instruction to each slave, and each slave enters the working state and starts to detect the voltage across the corresponding outlet contact. Alternatively, the input unit may include a touch screen or a keyboard. Optionally, the touch screen may be a touch display screen, and the touch display screen may be configured to display the action time of each exit contact.
With continued reference to FIG. 4, the host may include a storage unit 408. It should be noted that the storage unit 408 may correspondingly store the action time of a plurality of outlet pressure plates, so that the relay protection personnel may inquire the action time of the corresponding outlet pressure plate. Optionally, the storage unit is connected to the second control unit, and the second control unit stores the operation time corresponding to the plurality of outlet contacts in the storage unit. Optionally, the information stored in the storage unit may be updated, deleted, or added. Optionally, the second control unit may further read information in the storage unit according to an operation of the relay protection worker in the input unit, and display the read information through the touch display screen.
Referring to fig. 3 and 4, the slave 220 may further include a first wireless unit 316, and the master 210 may further include a second wireless unit 410. Specifically, the first wireless unit 316 is connected to the first control unit 222, and the first wireless unit 316 is configured to receive a first control signal and send the first control signal. The second wireless unit 410 is connected to the second control unit 212, and is configured to receive the first control signal sent by the first wireless unit 316 and output the first control signal to the second control unit 212.
It should be noted that the first wireless unit 316 and the second wireless unit 410 are communicatively coupled. The first wireless unit 316 acquires the first control signal and transmits the first control signal to the second wireless unit 410, and the second wireless unit 410 receives the first control signal transmitted by the first wireless unit 316 and transmits the first control signal to the second control unit 212.
Optionally, the second control unit 212 sends the received test start command to the first wireless unit 316 through the second wireless unit 410, and the first wireless unit 316 sends the received test start command to the first control unit 222, so as to trigger the slave 220 to detect the voltage across the outlet node.
According to the secondary loop signal detection system provided by the embodiment, the slave and the host are connected through the first wireless unit and the second wireless unit without being limited by wires, so that the distance limit of the secondary loop signal detection system is reduced.
In an optional embodiment of the present application, the first control unit may be a single chip microcomputer and/or the second control unit is a central processing unit. The central processing unit is used as a second control unit, the action time of all related outlet loops can be obtained by triggering the relay protection device to perform protection action for one time, and relay protection personnel can check detection data conveniently.
In an alternative embodiment of the present application, the slave enclosure is provided with a magnet and/or the master enclosure is provided with a magnet. Because the first control unit of the slave machine is used for detecting the voltage at two ends of the outlet contact corresponding to the relay protection device, the magnet is arranged on the shell of the slave machine, so that the slave machine can be adsorbed on an iron cabinet body on site, and the first input end and the second input end of the slave machine can be conveniently connected with the first end of the outlet contact and the outlet pressing plate. The magnet is arranged on the shell of the host machine, so that the installation position of the host machine can be more flexible.
Referring to fig. 5, a secondary loop signal detection system according to another embodiment of the present application is shown, which may include a master 210 and at least one slave 220. The secondary signal detection system has a self-checking function, namely, the function of the secondary signal detection system can be detected.
The shell of the slave machine is provided with a magnet, so that the slave machine can be adsorbed on an iron cabinet body on a detection site. As shown in fig. 5, the slave 220 has a first power supply 502, a single chip microcomputer 504, a first wireless unit 316, a first input terminal 302, a second input terminal 304, and an indicator lamp 506 built in the housing. It should be noted that the first power supply 502 is used to provide an operating voltage for the slave. The descriptions of the single chip microcomputer 504, the first wireless unit 316, the first input end 302, the second input end 304, and the indicator 506 refer to the above embodiments, and are not repeated herein. Optionally, the indicator light may be an LED indicator light.
The shell of the main machine is provided with a magnet, so that the main machine can be adsorbed on an iron cabinet body on a detection site. As shown in fig. 5, the host housing houses a second wireless unit 410, a second power supply 508, a third input 402 and a fourth input 404, a Central Processing Unit (CPU)510, a storage unit 408, and an input unit 406. It should be noted that the first power supply 508 is used to provide an operating voltage for the host 210. Optionally, the input unit may include a display screen, and the display screen may be used to display a time when the first control signal of the slave is received. The descriptions of the second wireless unit 410, the third input 402, the fourth input 404, the Central Processing Unit (CPU)510, the storage unit 408, and the input unit 406 refer to the above embodiments and are not repeated herein.
The working principle of the secondary loop signal detection system provided by the embodiment is briefly described below.
And connecting the first input end of the slave machine with the first end of the outlet joint to be measured, and enabling the second input end of the slave machine to be lower than the lower pile of the outlet pressing plate corresponding to the outlet joint to be measured. The first control unit outputs a first control signal when the outlet contact is closed and conducted. It should be noted that the first end of the outlet contact is the end of the outlet contact electrically connected to the control power supply, the first input end is connected to the pile in the relay protection cabinet corresponding to the first end of the outlet contact, and the lower pile of the outlet pressure plate is the pile outputting the positive pulse signal when the outlet contact is operated.
And connecting the third input end of the host computer with the first end of the switch-out contact of the relay protection tester, and connecting the fourth input end of the host computer with the second end of the switch-out contact of the relay protection tester. It should be noted that the relay protection tester opens the contact when it enters a fault state, and the host starts timing when it detects that the contact is closed. And after the timing is started, recording the time corresponding to the reception of the first control signal sent by each slave as the action time corresponding to the exit contact.
The secondary loop signal detection system provided by the embodiment does not need to ensure that the provided reference voltage is not changed, and does not need to change the reference voltage according to different voltage levels of the direct current system of the tested substation, so that the complexity of equipment of the secondary loop signal detection system can be reduced, and meanwhile, the secondary loop signal detection system is suitable for substations with different voltage levels. Meanwhile, the secondary circuit signal detection system provided by the embodiment does not need to detect the voltage of the outlet pressing plate to the ground, so that the risk of direct current grounding of the whole substation caused by damage of elements of the relay protection device can be avoided.
Through the secondary circuit signal detection system provided by the embodiment, relay protection personnel only need to perform primary protection action on the trigger relay protection device, so that all related outlet contacts can be checked, the field debugging efficiency is improved, and the secondary circuit signal detection system has the characteristics of high efficiency and reliability.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A secondary loop signal detection system, comprising:
the slave machine comprises a first control unit, wherein the first control unit is used for detecting the voltage at two ends of an outlet contact corresponding to the relay protection device and outputting a first control signal corresponding to the outlet contact under the condition that the voltages at two ends of the outlet contact are consistent;
and the master machine comprises a second control unit which is in communication connection with at least one slave machine, and the second control unit is used for starting timing when receiving a trigger signal of a protection action and finishing timing when receiving the first control signal to obtain action time corresponding to the outlet contact.
2. The secondary loop signal detection system of claim 1, wherein the slave includes a first input terminal and a second input terminal, the first input terminal is used for electrically connecting to a first end of an outlet contact of the relay protection device, and the second input terminal is used for electrically connecting to an outlet pressure plate of the relay protection device; the first end of the outlet contact is electrically connected with a control power supply, and the second end of the outlet contact is electrically connected with the outlet pressing plate.
3. The secondary circuit signal detection system according to claim 1, wherein the trigger signal of the protection operation is an output signal generated synchronously when the relay protection tester outputs the fault signal to the relay protection device.
4. The secondary loop signal detection system of claim 3, wherein the host further comprises a third input terminal for electrically connecting to a first terminal of an open contact of the relay protection tester and a fourth input terminal for electrically connecting to a second terminal of the open contact of the relay protection tester; the first end of the open contact and the second end of the open contact are closed and conducted when the relay protection tester outputs the fault signal, and the second control unit is further used for starting timing when the first end and the second end of the open contact of the relay protection tester are closed and conducted.
5. The secondary loop signal detection system of claim 1 wherein the host computer includes an input unit for receiving a start test command.
6. The secondary loop signal detection system of claim 5, wherein the slave further comprises a first wireless unit, the first wireless unit is connected with the first control unit, and the first wireless unit is configured to receive the first control signal and transmit the first control signal;
the host further comprises a second wireless unit, the second wireless unit is connected with the second control unit, and the second wireless unit is used for receiving the first control signal sent by the first wireless unit and outputting the first control signal to the second control unit.
7. The secondary loop signal detection system of claim 1, wherein the first control unit is a single chip microcomputer and/or the second control unit is a central processing unit.
8. The secondary loop signal detection system of claim 1, wherein the slave further comprises an indication unit connected to an output terminal of the first control unit, the indication unit being configured to indicate under control of the first control unit when voltages across the corresponding outlet contacts are identical.
9. The secondary loop signal detection system of claim 1 wherein the host further comprises a storage unit.
10. The secondary loop signal detection system as claimed in any one of claims 1 to 9, wherein the slave enclosure is provided with a magnet and/or the master enclosure is provided with a magnet.
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