CN115201548B - Residual voltage detection recording device and method for power distribution terminal - Google Patents
Residual voltage detection recording device and method for power distribution terminal Download PDFInfo
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- CN115201548B CN115201548B CN202211112539.7A CN202211112539A CN115201548B CN 115201548 B CN115201548 B CN 115201548B CN 202211112539 A CN202211112539 A CN 202211112539A CN 115201548 B CN115201548 B CN 115201548B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
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- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- H—ELECTRICITY
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Abstract
The application is suitable for the technical field of distribution feeder automation, and provides a distribution terminal residual voltage detection recording device and method. The device comprises: the two residual voltage detection and recording circuits are respectively used for latching the respectively collected residual voltage signals; each residual voltage detection recording circuit comprises: the voltage transformer, the emitter follower circuit, the rectifier circuit and the latch circuit are connected in sequence; the latch circuit comprises a latch and a first triode; in each residual voltage detection recording circuit, an emitter follower circuit is used for isolating residual voltage signals collected by a voltage transformer; the rectification circuit is used for rectifying the isolated residual voltage signal; the output end of the latch is connected with the base electrode of the first triode, the enabling end of the latch is connected with the collector electrode of the first triode, the resetting end of the latch is grounded with the emitting electrode of the first triode, and the latch circuit is used for latching the rectified residual voltage signal. The residual voltage signal can be accurately and reliably recorded, and missing detection of the residual voltage signal is avoided.
Description
Technical Field
The application relates to the technical field of distribution feeder automation, in particular to a distribution terminal residual voltage detection recording device and method.
Background
At present, the requirements on the reliability, stability and safety of a power grid are higher and higher, and an in-situ feeder automation technology is one of key technologies for guaranteeing power supply safety.
The basic principle of the in-situ feeder automation is 'delayed switching on when an incoming call is received, and non-voltage switching off', when a fault occurs in a circuit, a power distribution terminal needs to detect and judge a residual voltage signal in the implementation process of the in-situ feeder automation so as to execute protection logic and reduce the area of the circuit power failure area.
The existing residual voltage recording module usually adopts a magnetic latching relay to detect and record residual voltage signals, power is required to be supplied by means of the residual voltage signals under the conditions that a power distribution terminal is out of power and stops running and a backup power supply is not available, consumption is caused to the residual voltage signals, the residual voltage signal maintenance time is only dozens of milliseconds, when the residual voltage signal maintenance time is short and the voltage is low, the existing residual voltage recording module easily causes residual voltage signal missing detection and cannot normally record the residual voltage signals, and then the power distribution terminal cannot effectively isolate fault areas.
Disclosure of Invention
In view of this, the embodiment of the present application provides a device and a method for detecting and recording residual voltage of a power distribution terminal, so as to solve the technical problem that the existing residual voltage recording module easily causes the detection omission of residual voltage signals and cannot normally record the residual voltage signals.
In a first aspect, an embodiment of the present application provides a distribution terminal residual voltage detection recording apparatus, including: the two residual voltage detection and recording circuits are respectively used for acquiring residual voltage signals of the first primary equipment and the second primary equipment; wherein, each residual voltage detection recording circuit includes: the voltage transformer, the emitter follower circuit, the rectifier circuit and the latch circuit are connected in sequence; the latch circuit comprises a latch and a first triode;
in each residual voltage detection recording circuit, the input end of the emitter follower circuit is used for inputting residual voltage signals collected by a voltage transformer, the output end of the emitter follower circuit is connected with the input end of the rectifying circuit, and the emitter follower circuit is used for isolating the residual voltage signals collected by the voltage transformer; the output end of the rectifying circuit is connected with the enabling end of the latch and the input end of the latch, and the rectifying circuit is used for rectifying the isolated residual voltage signal; the output end of the latch is connected with the base electrode of the first triode, the enabling end of the latch is connected with the collector electrode of the first triode, the resetting end of the latch is grounded with the emitting electrode of the first triode, and the latch circuit is used for latching the rectified residual voltage signal.
In a possible implementation manner of the first aspect, the power distribution terminal residual voltage detection recording device further includes: a reset circuit; the reset circuit comprises a reset signal input end and a second triode; the reset signal input end is connected with the base electrode of the second triode; an emitter of the second triode is connected with the reset end of the latch; the reset circuit is used for resetting the latch.
In a possible implementation manner of the first aspect, the power distribution terminal residual voltage detection recording device further includes: a power supply circuit; the power supply circuit comprises a battery, a first diode, a second diode and a third diode; the anode of the battery is connected with the power supply end and the enabling end of the first diode, and the cathode of the battery is grounded; the input end of the second diode is connected with an internal power supply of the power distribution terminal, the output end of the second diode is connected with the input end of the third diode, and the output end of the third diode is connected with the output end of the first diode; the output end of the first diode is used as a power supply end to supply power for the residual voltage detection recording circuit.
In a possible implementation manner of the first aspect, the voltage transformers in the two residual voltage detection and recording circuits are respectively used for reducing the voltage of the initial residual voltage signals generated by the primary devices which are acquired by the voltage transformers respectively to obtain residual voltage signals; the type of the voltage transformer is selected according to the type of primary equipment generating the initial residual voltage signal.
In one possible embodiment of the first aspect, the rectifier circuit comprises a fourth diode, a power supply terminal and an enable terminal of the fourth diode being input terminals of the rectifier circuit, and an output terminal of the fourth diode being an output terminal of the rectifier circuit.
In one possible implementation manner of the first aspect, the latch circuit further includes: a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with the output end of the rectifying circuit, and the other end of the first resistor is connected with the enabling end of the latch; one end of the second resistor is connected with the output end of the latch, and the other end of the second resistor is connected with the base electrode of the first triode; one end of the third resistor is connected with the output end of the latch, and the other end of the third resistor is connected with the emitting electrode of the first triode.
In one possible implementation manner of the first aspect, the reset circuit further includes: a fourth resistor; one end of the fourth resistor is connected with the emitting electrode of the second triode, and the other end of the fourth resistor is grounded.
In one possible implementation of the first aspect, the power supply circuit further includes: a fifth resistor and a first capacitor; one end of the fifth resistor is connected with the anode of the battery, and the other end of the fifth resistor is grounded; one end of the first capacitor is connected with the anode of the battery, and the other end of the first capacitor is grounded.
In a possible implementation of the first aspect, the power supply terminal of the latch is connected to the power supply terminal.
In a second aspect, an embodiment of the present application provides a method for detecting and recording residual voltage of a power distribution terminal, which is applied to the device for detecting and recording residual voltage of a power distribution terminal in any one of the first aspect, and the method includes: the emitter follower circuit isolates the residual voltage signal collected by the voltage transformer to obtain an isolated residual voltage signal; the rectification circuit rectifies the isolated residual voltage signal to obtain a rectified residual voltage signal; the latch circuit latches the rectified residual voltage signal.
It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.
The device and the method for detecting and recording the residual voltage of the power distribution terminal provided by the embodiment of the application comprise the following steps: the two residual voltage detection and recording circuits are respectively used for acquiring residual voltage signals of the first primary equipment and the second primary equipment; wherein, each residual voltage detection recording circuit includes: the voltage transformer, the emitter follower circuit, the rectifier circuit and the latch circuit are connected in sequence; the latch circuit comprises a latch and a first triode. In each residual voltage detection recording circuit, the emitter follower circuit is used for isolating residual voltage signals collected by a voltage transformer, the rectifier circuit is used for rectifying the isolated residual voltage signals, the output end of the latch is connected with the base electrode of the first triode, the enabling end of the latch is connected with the collector electrode of the first triode, the resetting end of the latch is grounded with the emitter electrode of the first triode, the latch circuit is used for latching the rectified residual voltage signals, the residual voltage signals are latched through the latch with low power consumption, the consumption of the residual voltage signals can be reduced, the residual voltage signals are accurately and reliably recorded, and the situation that the power distribution terminal caused by the missed detection of the residual voltage signals cannot effectively isolate a fault area is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit connection diagram of a residual voltage detection and recording device of a power distribution terminal according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the electrical connections of a power distribution terminal circuit breaker switch and primary equipment;
fig. 3 is a schematic circuit connection diagram of a residual voltage detection and recording device of a power distribution terminal according to an embodiment of the present application;
FIG. 4 is a schematic circuit diagram of a power circuit according to an embodiment of the present application;
fig. 5 is a schematic flowchart of a method for detecting and recording residual voltage of a power distribution terminal according to an embodiment of the present application.
Detailed Description
The present application will be described more clearly with reference to specific examples. The following examples will assist those skilled in the art in further understanding the role of the present application, but are not intended to limit the application in any way. It should be noted that numerous variations and modifications could be made by those skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, 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.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In addition, the references to "a plurality" in the embodiments of the present application should be interpreted as two or more.
At present, the requirements on the reliability, stability and safety of a power grid are higher and higher, and an in-situ feeder automation technology is one of key technologies for guaranteeing power supply safety. The basic principle of the in-situ feeder automation is 'delayed switching on when an incoming call is received, and non-voltage switching off', when a fault occurs in a circuit, a power distribution terminal needs to detect and judge a residual voltage signal in the implementation process of the in-situ feeder automation so as to execute protection logic and reduce the area of the circuit power failure area.
The existing residual voltage recording module usually adopts a magnetic latching relay to detect and record residual voltage signals, power is required to be supplied by means of the residual voltage signals under the conditions that a power distribution terminal is out of power and stops running and a backup power supply is not available, consumption is caused to the residual voltage signals, the residual voltage signal maintenance time is only dozens of milliseconds, when the residual voltage signal maintenance time is short and the voltage is low, the existing residual voltage recording module easily causes residual voltage signal missing detection and cannot normally record the residual voltage signals, and then the power distribution terminal cannot effectively isolate fault areas. In addition, the existing residual voltage recording module is usually only suitable for one or two kinds of primary equipment, namely, is only suitable for one or two kinds of voltage mutual inductance modes, but cannot be simultaneously suitable for multiple kinds of primary equipment, and the application range is limited.
Based on the above problems, the inventors have studied and found that a latch with low power consumption can be used instead of a magnetic latching relay to detect a recording residual voltage signal.
That is to say, the distribution terminal residual voltage detection recorder that this application embodiment provided includes: the two residual voltage detection and recording circuits are respectively used for acquiring residual voltage signals of the first primary equipment and the second primary equipment; wherein, each residual voltage detection recording circuit includes: the voltage transformer, the emitter follower circuit, the rectifier circuit and the latch circuit are connected in sequence; the latch circuit comprises a latch and a first triode. In each residual voltage detection recording circuit, the emitter follower circuit is used for isolating residual voltage signals collected by a voltage transformer, the rectifier circuit is used for rectifying the isolated residual voltage signals, the output end of the latch is connected with the base electrode of the first triode, the enabling end of the latch is connected with the collector electrode of the first triode, the resetting end of the latch is grounded with the emitter electrode of the first triode, the latch circuit is used for latching the rectified residual voltage signals, the residual voltage signals are latched through the latch with low power consumption, the consumption of the residual voltage signals can be reduced, the residual voltage signals are accurately and reliably recorded, and the situation that a power distribution terminal caused by the missed detection of the residual voltage signals cannot effectively isolate a fault area is avoided.
Fig. 1 is a schematic circuit connection diagram of a residual voltage detection and recording device of a power distribution terminal according to an embodiment of the present application. As shown in fig. 1, the power distribution terminal residual voltage detection recording apparatus includes: and the two residual voltage detection and recording circuits are respectively used for acquiring residual voltage signals of the first primary equipment and the second primary equipment. Wherein, each residual voltage detection recording circuit includes: the voltage transformer U, the emitter follower circuit, the rectifier circuit and the latch circuit are connected in sequence. The latch circuit includes a latch S and a first transistor P1.
In each residual voltage detection recording circuit, the input end of the emitter follower circuit is used for inputting residual voltage signals collected by the voltage transformer U, the output end of the emitter follower circuit is connected with the input end of the rectifying circuit, and the emitter follower circuit is used for isolating the residual voltage signals collected by the voltage transformer U.
The output end of the rectifying circuit is connected with the enabling end LE of the latch and the input end D of the latch, and the rectifying circuit is used for rectifying the isolated residual voltage signals.
The output end Q of the latch is connected with the base electrode of the first triode P1, the enable end LE of the latch is connected with the collector electrode of the first triode P1, the reset end OE of the latch is grounded with the emitter electrode of the first triode P1, and the latch circuit is used for latching the rectified residual voltage signal.
Optionally, the voltage transformers U in the two residual voltage detection and recording circuits are respectively used for reducing the voltage of the initial residual voltage signals generated by the primary devices collected by the voltage transformers U, so as to obtain residual voltage signals. The type of the voltage transformer U is selected according to the type of primary equipment generating the initial residual voltage signal.
In practical application, the residual voltage signals on two sides of the switch of the power distribution terminal circuit breaker need to be detected and recorded, the schematic circuit connection diagram of the switch of the power distribution terminal circuit breaker and primary equipment is shown in fig. 2, the two sides of the switch of the power distribution terminal circuit breaker are respectively provided with the primary equipment, in order to distinguish the two primary equipment, the two primary equipment are respectively called as first primary equipment and second primary equipment, and the initial residual voltage signals generated by the two primary equipment need to be detected and recorded.
For example, in each residual voltage detection recording circuit, the voltage transformer U steps down the initial residual voltage signal generated by the corresponding primary device to obtain a residual voltage signal, for example, the voltage of the initial residual voltage signal generated by the primary device is 220V, but the residual voltage detection recording circuit cannot bear the voltage of 220V, and at this time, the voltage transformer U steps down the initial residual voltage signal to obtain a residual voltage signal with a voltage of 3V.
Specifically, the primary devices can be single-winding voltage transformers, electronic voltage transformers or capacitance voltage-dividing power-taking modules and the like, and meanwhile, the types of the first primary devices and the second primary devices on two sides of the power distribution terminal breaker switch can be different. Correspondingly, the type of the voltage transformer U is selected according to the type of the primary equipment, so that the residual voltage detection and recording device of the power distribution terminal provided by the embodiment of the application can be suitable for different types of power supply/line voltage measurement modes, and the application range is expanded.
Illustratively, in each residual voltage detection recording circuit, the emitter follower circuit isolates a residual voltage signal acquired by the voltage transformer U to obtain an isolated residual voltage signal. The input of the latch S must be a direct current signal, and the rectifying circuit rectifies the isolated residual voltage signal, so that the isolated residual voltage signal is changed from an alternating current signal into a direct current signal to obtain the rectified residual voltage signal. In the latch circuit, an enable end LE of a latch is pulled up to a high level according to a rectified residual voltage signal, an output end Q of the latch outputs the rectified residual voltage signal input by an input end D of the latch and is pulled up to the high level, at the moment, a first triode P1 is conducted due to the fact that the output end Q of the latch is the high level, the enable end LE of the latch is pulled down to a low level due to the fact that the first triode P1 is conducted, the latch S is enabled to execute a latch function, and the rectified residual voltage signal output by the output end Q of the latch is latched at the output end Q of the latch.
Alternatively, referring to fig. 3, the rectifier circuit includes a fourth diode L4, a power supply terminal VDD4 of the fourth diode and an enable terminal EN4 of the fourth diode are used as input terminals of the rectifier circuit, and an output terminal OUT4 of the fourth diode is used as an output terminal of the rectifier circuit. The first end NC4 of the fourth diode is suspended, and the ground GND4 of the fourth diode is grounded. The model of the fourth diode L4 may be MAX40200 or the like. The model of the latch S may be SN74LVC1G373DBVR or the like.
In a possible embodiment, referring to fig. 3, the distribution terminal residual voltage detection recording apparatus further includes: and a reset circuit. The reset circuit includes a reset signal input terminal REST and a second transistor P2.
The reset signal input end REST is connected with the base electrode of the second triode P2, and the emitting electrode of the second triode P2 is connected with the reset end OE of the latch. The reset circuit is used for resetting the latch S.
In practical application, after the rectified residual voltage signal is latched, when the power distribution terminal is electrified again to normally operate, the power distribution terminal acquires the rectified residual voltage signal recorded by the latch S and needs to reset the latch S after executing protection logic, and the main control chip of the power distribution terminal can generate a reset signal so as to reset the latch S.
In the exemplary reset circuit, the reset signal input terminal REST is pulled up to a high level according to the reset signal, at this time, the second triode P2 is turned on due to the high level of the reset signal input terminal REST, the reset terminal OE of the latch is pulled up to a high level due to the turn-on of the second triode P2, the output terminal Q of the latch is pulled down to a low level due to the high level of the reset terminal OE of the latch, at this time, the latch S is reset, and the rectified residual voltage signal latched at the output terminal Q of the latch is cleared, so that the latch S can be used for latching the residual voltage signal next time.
In order to avoid the situation that the power distribution terminal stops running due to power loss and has no backup power supply, the power supply needs to be supplied by a residual voltage signal, the residual voltage signal is consumed, and a power supply circuit can be arranged to supply power to the power distribution terminal residual voltage detection and recording device.
In a possible embodiment, referring to fig. 4, the device for detecting and recording residual voltage of power distribution terminals further includes: a power supply circuit. The power supply circuit includes a battery V1, a first diode L1, a second diode L2, and a third diode L3.
The positive electrode of the battery V1 is connected with the power supply end VDD1 of the first diode and the enabling end EN1 of the first diode, and the negative electrode of the battery V1 is grounded. The input end of the second diode L2 is connected with the internal power supply V2 of the power distribution terminal, the output end of the second diode L2 is connected with the input end of the third diode L3, and the output end of the third diode L3 is connected with the output end OUT1 of the first diode. The output end OUT1 of the first diode is used as a power supply end V3 to supply power for the residual voltage detection recording circuit.
Specifically, the power supply terminal VCC of the latch in the latch circuit is connected to the power supply terminal V3, and the collector of the second transistor P2 in the reset circuit is connected to the power supply terminal V3.
Optionally, the voltage of the battery V1 is less than the voltage provided by the internal power source V2 of the power distribution terminal. For example, the voltage supplied by the internal power source V2 of the power distribution terminal may be 5V, and the voltage of the battery V1 may be 3.6V.
Illustratively, under the condition that the power distribution terminal has electricity, the internal power supply V2 of the power distribution terminal provides voltage, at this time, the second diode L2 and the third diode L3 are turned on, the voltage of the output terminal OUT1 of the first diode is equal to the voltage provided by the internal power supply V2 of the power distribution terminal, the voltage of the input end of the first diode L1 is the voltage of the battery V1 and is smaller than the voltage of the output terminal OUT1 of the first diode, at this time, the first diode L1 is turned off, and the internal power supply V2 of the power distribution terminal supplies power for the residual voltage detection and recording device of the power distribution terminal.
Under the condition that the power distribution terminal loses power, the voltage of the input end of the first diode L1 is the voltage of the battery V1, the voltage of the output end OUT1 of the first diode is 0, at the moment, the first diode L1 is conducted, and the battery V1 supplies power for the residual voltage detection and recording device of the power distribution terminal.
The power supply circuit avoids the problem that power is supplied by the residual voltage signal under the conditions that the power distribution terminal stops running due to power loss and no backup power supply exists, and further ensures that the residual voltage signal can be accurately and reliably recorded under the conditions that the power distribution terminal stops running due to power loss and no backup power supply exists. Meanwhile, under the condition that the power distribution terminal is electrified, the internal power supply V2 of the power distribution terminal is adopted to supply power for the residual voltage detection and recording device of the power distribution terminal, and only under the condition that the power distribution terminal is not electrified, the battery V1 is adopted to supply power for the residual voltage detection and recording device of the power distribution terminal, so that the service life of the battery V1 is prolonged.
Optionally, the power supply terminal VDD1 of the first diode and the enable terminal EN1 of the first diode are used as the input terminal of the first diode L1, the first terminal NC1 of the first diode is suspended, and the ground terminal GND1 of the first diode is grounded. The model of the first diode L1 may be MAX40200, or the like.
It should be noted that the service life of the battery V1 should be longer than or equal to that of the distribution terminal breaker switch, for example, the service life of the distribution terminal breaker switch is 8-10 years, and the service life of the selected battery V1 should be longer than or equal to 8-10 years, so as to avoid the inconvenience caused by frequent replacement of the battery V1.
In some embodiments, optionally, referring to fig. 3, the latch circuit further includes: a first resistor R1, a second resistor R2 and a third resistor R3. One end of the first resistor R1 is connected with the output end of the rectifying circuit, and the other end of the first resistor R1 is connected with the enabling end LE of the latch. One end of the second resistor R2 is connected with the output end Q of the latch, and the other end of the second resistor R2 is connected with the base electrode of the first triode P1. One end of the third resistor R3 is connected with the output end Q of the latch, and the other end of the third resistor R3 is connected with the emitting electrode of the first triode P1.
Illustratively, the latch circuit further includes: a second capacitor C2. One end of the second capacitor C2 is connected to the power supply terminal VCC of the latch, and the other end is grounded. The ground GND of the latch is grounded.
The first resistor R1, the second resistor R2, the third resistor R3 and the second capacitor C2 are used for protecting the normal operation of electronic elements in the circuit and playing a role in voltage stabilization.
Optionally, the reset circuit further includes: and a fourth resistor R4. One end of the fourth resistor R4 is connected with the emitting electrode of the second triode P2, and the other end of the fourth resistor R is grounded.
The fourth resistor R4 is used for protecting the normal operation of the electronic components in the circuit and for stabilizing the voltage.
Optionally, the power circuit further includes: a fifth resistor R5 and a first capacitor C1. One end of the fifth resistor R5 is connected to the positive electrode of the battery V1, and the other end is grounded. One end of the first capacitor C1 is connected to the positive electrode of the battery V1, and the other end is grounded.
The fifth resistor R5 and the first capacitor C1 are used for protecting normal operation of electronic components in the circuit and for stabilizing voltage.
Optionally, the ground terminal of the voltage transformer U is grounded.
It should be noted that in the two residual voltage detection and recording circuits in fig. 3, the devices at the same position are denoted by the same reference numerals, for example, the fourth diodes included in the rectifying circuits in the two residual voltage detection and recording circuits are denoted by reference numeral L4, the first triodes are denoted by reference numeral P1, and so on. In practical application, however, in the two residual voltage detection and recording circuits, the devices at the same position are two different devices, but the types and models are the same.
The power distribution terminal residual voltage detection recording device that this application embodiment provided includes: two residual voltage detection recording circuit, every residual voltage detection recording circuit includes: the voltage transformer, the emitter follower circuit, the rectifier circuit and the latch circuit are connected in sequence; the latch circuit comprises a latch and a first triode; in each residual voltage detection recording circuit, the emitter follower circuit is used for isolating residual voltage signals collected by a voltage transformer, the rectifier circuit is used for rectifying the isolated residual voltage signals, the output end of the latch is connected with the base electrode of the first triode, the enabling end of the latch is connected with the collector electrode of the first triode, the resetting end of the latch is grounded with the emitter electrode of the first triode, the latch circuit is used for latching the rectified residual voltage signals, the residual voltage signals are latched through the latch with low power consumption, the consumption of the residual voltage signals can be reduced, the residual voltage signals are accurately and reliably recorded, and the situation that a power distribution terminal caused by the missed detection of the residual voltage signals cannot effectively isolate a fault area is avoided.
Fig. 5 is a schematic flowchart of a method for detecting and recording residual voltage of a power distribution terminal according to an embodiment of the present application. As shown in fig. 5, the method in the embodiment of the present application may be applied to a distribution terminal residual voltage detection recording device, and the distribution terminal residual voltage detection recording method may include:
And 102, rectifying the isolated residual voltage signal by using a rectifying circuit to obtain a rectified residual voltage signal.
And step 103, the latch circuit latches the rectified residual voltage signal.
Optionally, the distribution terminal residual voltage detection recording device may be the distribution terminal residual voltage detection recording device provided in the embodiment of the present application.
In a possible implementation manner, after the rectified residual voltage signal is latched and the power distribution terminal is powered again to operate normally, the power distribution terminal acquires the rectified residual voltage signal recorded by the latch and executes the protection logic, and then the latch needs to be reset so that the latch can be used for latching the residual voltage signal next time. In the embodiment of the present application, specific implementation processes and principles of the steps 101 to 103 and the reset circuit resetting the latch may be referred to in the foregoing embodiments, and are not described herein again.
According to the method for detecting and recording the residual voltage of the power distribution terminal, the residual voltage signals collected by the voltage transformer are isolated and rectified, the rectified residual voltage signals are latched by the low-power-consumption latch circuit, the consumption of the residual voltage signals can be reduced, the residual voltage signals can be accurately and reliably recorded, and the situation that the power distribution terminal cannot effectively isolate a fault area due to the fact that the residual voltage signals are missed to be detected is avoided.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill 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 substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a distribution terminal residual voltage detects recorder which characterized in that includes: the two residual voltage detection and recording circuits are respectively used for acquiring residual voltage signals of the first primary equipment and the second primary equipment; wherein, each residual voltage detection recording circuit includes: the voltage transformer, the emitter follower circuit, the rectifier circuit and the latch circuit are connected in sequence; the latch circuit comprises a latch and a first triode;
in each residual voltage detection recording circuit, the input end of the emitter follower circuit is used for inputting residual voltage signals collected by the voltage transformer, the output end of the emitter follower circuit is connected with the input end of the rectifying circuit, and the emitter follower circuit is used for isolating the residual voltage signals collected by the voltage transformer;
the output end of the rectifying circuit is connected with the enabling end of the latch and the input end of the latch, and the rectifying circuit is used for rectifying the isolated residual voltage signal;
the output end of the latch is connected with the base electrode of the first triode, the enabling end of the latch is connected with the collector electrode of the first triode, the reset end of the latch is grounded with the emitter electrode of the first triode, and the latch circuit is used for latching the rectified residual voltage signal;
distribution terminal residual voltage detects recorder still includes: a power supply circuit; the power supply circuit comprises a battery, a first diode, a second diode and a third diode;
the anode of the battery is connected with the power supply end and the enabling end of the first diode, and the cathode of the battery is grounded; the input end of the second diode is connected with an internal power supply of a power distribution terminal, the output end of the second diode is connected with the input end of the third diode, and the output end of the third diode is connected with the output end of the first diode; and the output end of the first diode is used as a power supply end to supply power for the residual voltage detection recording circuit.
2. The distribution terminal residual voltage detection recording apparatus according to claim 1, wherein said distribution terminal residual voltage detection recording apparatus further comprises: a reset circuit; the reset circuit comprises a reset signal input end and a second triode;
the reset signal input end is connected with the base electrode of the second triode;
an emitter of the second triode is connected with the reset end of the latch;
the reset circuit is used for resetting the latch.
3. The distribution terminal residual voltage detection recording device according to claim 1, wherein the voltage transformers in the two residual voltage detection recording circuits are respectively used for reducing the voltage of the initial residual voltage signals generated by the primary devices collected by the voltage transformers to obtain residual voltage signals;
the type of the voltage transformer is selected according to the type of primary equipment generating the initial residual voltage signal.
4. The power distribution terminal residual voltage detection recording device according to claim 1, wherein said rectifier circuit includes a fourth diode, a power supply terminal and an enable terminal of said fourth diode being input terminals of said rectifier circuit, and an output terminal of said fourth diode being an output terminal of said rectifier circuit.
5. The distribution terminal residual voltage detection recording device according to claim 1, wherein the latch circuit further comprises: a first resistor, a second resistor and a third resistor;
one end of the first resistor is connected with the output end of the rectifying circuit, and the other end of the first resistor is connected with the enabling end of the latch;
one end of the second resistor is connected with the output end of the latch, and the other end of the second resistor is connected with the base electrode of the first triode;
one end of the third resistor is connected with the output end of the latch, and the other end of the third resistor is connected with the emitting electrode of the first triode.
6. The apparatus of claim 2, wherein the reset circuit further comprises: a fourth resistor;
one end of the fourth resistor is connected with the emitting electrode of the second triode, and the other end of the fourth resistor is grounded.
7. The distribution terminal residual voltage detection recording device according to claim 1, wherein said power supply circuit further comprises: a fifth resistor and a first capacitor;
one end of the fifth resistor is connected with the anode of the battery, and the other end of the fifth resistor is grounded;
one end of the first capacitor is connected with the anode of the battery, and the other end of the first capacitor is grounded.
8. The apparatus according to claim 1, wherein a power supply terminal of said latch is connected to said power supply terminal.
9. A residual voltage detection recording method of a power distribution terminal is characterized by being applied to the residual voltage detection recording device of the power distribution terminal as claimed in any one of claims 1 to 8; the method comprises the following steps:
the emitter follower circuit isolates the residual voltage signal collected by the voltage transformer to obtain an isolated residual voltage signal;
the rectification circuit rectifies the isolated residual voltage signal to obtain a rectified residual voltage signal;
and the latch circuit latches the rectified residual voltage signal.
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| CN202211112539.7A CN115201548B (en) | 2022-09-14 | 2022-09-14 | Residual voltage detection recording device and method for power distribution terminal |
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| CN202211112539.7A CN115201548B (en) | 2022-09-14 | 2022-09-14 | Residual voltage detection recording device and method for power distribution terminal |
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| CN115201548B true CN115201548B (en) | 2022-11-29 |
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| US9614502B2 (en) * | 2015-08-04 | 2017-04-04 | Qualcomm Incorporated | Accurate sample latch offset compensation scheme |
| CN109709374B (en) * | 2019-01-21 | 2021-03-16 | 江苏金智科技股份有限公司 | Residual voltage detection circuit |
| CN211266558U (en) * | 2019-10-21 | 2020-08-14 | 浙江中自机电控制技术有限公司 | Switched reluctance motor driver latch fault signal and reset fault signal circuit |
| CN211878059U (en) * | 2019-11-14 | 2020-11-06 | 珠海菲森电力科技有限公司 | Residual voltage detection circuit |
| CN210986078U (en) * | 2019-12-30 | 2020-07-10 | 湖南师范大学 | Digital signal output module |
| CN112362943B (en) * | 2020-10-27 | 2024-03-01 | 许继集团有限公司 | Residual voltage detection circuit and detection method |
| CN114156844B (en) * | 2021-10-29 | 2024-03-22 | 山东电工电气集团新能科技有限公司 | In-situ coincident feeder line automatic protection device with residual voltage locking function |
| CN217363044U (en) * | 2022-01-10 | 2022-09-02 | 深圳天邦达科技有限公司 | Simple low-cost signal latch circuit |
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