CN109655661A - The voltage check device and method of substation - Google Patents
The voltage check device and method of substation Download PDFInfo
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- CN109655661A CN109655661A CN201910136811.7A CN201910136811A CN109655661A CN 109655661 A CN109655661 A CN 109655661A CN 201910136811 A CN201910136811 A CN 201910136811A CN 109655661 A CN109655661 A CN 109655661A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 230000003321 amplification Effects 0.000 claims abstract description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 29
- 230000001419 dependent effect Effects 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 abstract 2
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- 238000010586 diagram Methods 0.000 description 7
- 238000004590 computer program Methods 0.000 description 5
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
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Abstract
The present invention provides the voltage check device of substation and methods, comprising: resistor voltage divider circuit, voltage comparator circuit and relay drive circuit, resistor voltage divider circuit obtain analog voltage value for dividing line voltage distribution；Voltage comparator circuit is used to analog voltage value carrying out interference volume removal processing, the analog voltage value that obtains that treated, will treated that analog voltage value amplifies, the analog voltage value amplified, the analog voltage value of amplification is subjected to analog-to-digital conversion, obtains digital quantity voltage value；And be compared digital quantity voltage value with preset voltage value, control signal is generated according to comparison result；Relay drive circuit is used for according to control signal control relay closure; and pressure signal is had according to the output of the closed state of relay; it can be in the case where route has pressure; there is pressure junction closure; realization have press off into, collect the function of line protective devices, thus cooperate line protective devices realize checkout voltage reclosing function.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a voltage detection device and method of a transformer substation.
Background
In a line switch cabinet of a 10kV transformer substation, a device for detecting whether a voltage exists on a line is lacked; after a 10kV line switch cabinet of a transformer substation trips, no related line detection device is arranged, and the function of voltage detection reclosing is realized by matching with a line protection device. Meanwhile, the 10kV line protection device has a function of opening under pressure and a function of accessing the line voltage UXL, but has no related voltage acquisition device, so that the line protection of the 10kV line switch cabinet is influenced, and the reclosing rate is low.
Disclosure of Invention
In view of the above, the present invention is to provide a voltage detection apparatus and method for a substation, which can close a voltage contact under the condition that a line has a voltage, so as to implement a function of opening the voltage to a line protection apparatus, and can acquire the voltage condition of the line in real time, so as to implement a function of detecting a non-voltage reclosing in cooperation with the line protection apparatus after a fault switch of a 10kV line of the substation trips.
In a first aspect, an embodiment of the present invention provides a voltage detection apparatus for a substation, where the apparatus includes a resistance voltage divider circuit, a voltage comparison circuit, and a relay drive circuit, where the resistance voltage divider circuit, the voltage comparison circuit, and the relay drive circuit are connected in sequence;
the resistance voltage division circuit is used for dividing the line voltage to obtain an analog quantity voltage value;
the voltage comparison circuit is used for removing interference from the analog quantity voltage value to obtain a processed analog quantity voltage value, amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value, and performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value; comparing the digital quantity voltage value with a preset voltage value, and generating a control signal according to a comparison result;
and the relay driving circuit is used for controlling the relay to be closed according to the control signal and outputting a voltage signal according to the closing state of the relay.
Further, in the resistance voltage dividing circuit, one end of a voltage-dependent voltage dividing resistor Rf is input with the line voltage, the other end of the voltage-dependent voltage dividing resistor Rf is respectively connected with one end of a voltage-dependent voltage dividing resistor Rb and the voltage comparison circuit, and the other end of the voltage-dependent voltage dividing resistor Rb is connected with the voltage comparison circuit and grounded.
Furthermore, the voltage comparison circuit comprises an acquisition module, an amplification module, a data conversion module, a microprocessor module and a data output module;
the acquisition module is respectively connected with the voltage-sensitive divider resistor Rf and the voltage-sensitive divider resistor Rb and is used for removing the interference of the analog voltage value to obtain a processed analog voltage value;
the amplification module is connected with the acquisition module and is used for amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value;
the data conversion module is connected with the amplification module and used for performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain the digital quantity voltage value;
the microprocessor module is connected with the data conversion module and used for comparing the digital quantity voltage value with a preset voltage value and generating a control signal according to a comparison result;
and the data output module is connected with the microprocessor module and used for outputting the control signal.
Further, the preset voltage value comprises a first preset voltage value and a second preset voltage value;
the microprocessor module is also used for comparing the digital value with the first preset voltage value, and generating a first control signal if the digital value is greater than or equal to the first preset voltage value;
or,
the digital quantity voltage value is compared with a second preset voltage value, and if the digital quantity voltage value is smaller than the second preset voltage value, a second control signal is not output;
the first preset voltage value is 70% of rated voltage, the second preset voltage value is 30% of the rated voltage, and the rated voltage is 57.7V.
Further, the relay driving circuit is further configured to control the relay to be closed according to the first control signal, and output the voltage signal according to a closed state of the relay;
or,
and the non-voltage signal is also used for controlling the relay to be switched off under the condition that a second control signal is not output, and outputting the non-voltage signal according to the switching-off state of the relay.
Further, in the relay driving circuit, a fifth contact of the relay K1 is connected with a resistor R1, and a sixth contact of the relay K1 is connected with an indicator light;
when the relay K1 acts, the fifth contact and the sixth contact of the relay K1 are closed, and the indicator lamp is turned on.
Further, in the relay drive circuit, a first contact and a second contact of the relay K1 are connected to a first line protection device, respectively.
Further, in the relay driving circuit, a third contact of the relay K1 is connected to a second line protection device, a fourth contact of the relay K1 is connected to a bus voltage, and the bus voltage is connected to the second line protection device.
Furthermore, the voltage comparison circuit also comprises a power supply module and a setting fixed value module;
the power module is respectively connected with the acquisition module, the amplification module, the data conversion module, the microprocessor module and the relay drive circuit and is used for providing working power for the acquisition module, the amplification module, the data conversion module, the microprocessor module and the relay drive circuit;
and the setting fixed value module is used for determining the voltage state on the line and setting a first preset voltage value and a second preset voltage value of the microprocessor module.
With reference to the second aspect, an embodiment of the present invention provides a voltage detection method for a substation, where the method includes:
dividing the line voltage to obtain an analog quantity voltage value;
carrying out interference amount removal processing on the analog quantity voltage value to obtain a processed analog quantity voltage value;
amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value;
performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value;
comparing the digital value with a preset voltage value, and generating a control signal according to a comparison result;
and controlling the relay to be closed according to the control signal, and outputting a pressure signal according to the closed state of the relay.
The embodiment of the invention provides a voltage detection device and a voltage detection method for a transformer substation, which comprise the following steps: the relay comprises a resistance voltage division circuit, a voltage comparison circuit and a relay drive circuit, wherein the resistance voltage division circuit, the voltage comparison circuit and the relay drive circuit are sequentially connected; the resistance voltage division circuit is used for dividing the line voltage to obtain an analog quantity voltage value; the voltage comparison circuit is used for removing the interference quantity of the analog quantity voltage value to obtain a processed analog quantity voltage value, amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value, and performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value; comparing the digital value with a preset voltage value, and generating a control signal according to the comparison result; the relay driving circuit is used for controlling the relay to be closed according to the control signal and outputting a pressure signal according to the closing state of the relay, and can close a pressure contact under the condition that a line has pressure, so that the function of opening the line protection device under pressure is realized, the condition of line voltage can be acquired in real time, and the function of detecting non-pressure reclosing is realized by matching with the line protection device.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a voltage detection device of a substation according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a voltage comparison circuit according to a second embodiment of the present invention;
fig. 3 is a schematic view illustrating a first line protection device according to a second embodiment of the present invention;
fig. 4 is a schematic diagram illustrating UXL voltage acquisition of a second line protection device according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a relay driving circuit according to a third embodiment of the present invention;
fig. 6 is a flowchart of a voltage detection method for a substation according to a fourth embodiment of the present invention.
Icon:
10-a resistive divider circuit; 20-a voltage comparison circuit; 30-relay drive circuit; 21-a power supply module; 22-an acquisition module; 23-an amplification module; 24-a data conversion module; 25-a microprocessor module; 26-setting fixed value module; 27-data output module.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the understanding of the present embodiment, the following detailed description will be given of the embodiment of the present invention.
The first embodiment is as follows:
fig. 1 is a schematic diagram of a voltage detection device of a substation according to a first embodiment of the present invention.
Referring to fig. 1, the apparatus includes a resistance voltage dividing circuit 10, a voltage comparing circuit 20, and a relay driving circuit 30, wherein the resistance voltage dividing circuit 10, the voltage comparing circuit 20, and the relay driving circuit 30 are connected in sequence;
the resistance voltage division circuit 10 is used for dividing the line voltage to obtain an analog quantity voltage value;
here, the resistance voltage-dividing circuit 10 adopts the principle of resistance voltage distribution, and when the 10KV system voltage is normal, the line voltage is divided by the voltage-dependent voltage-dividing resistor Rf and the voltage-dependent voltage-dividing resistor Rb, so as to obtain the analog voltage value U1. The voltage-sensitive divider resistor Rf and the voltage-sensitive divider resistor Rb respectively protect the resistor voltage-dividing circuit and the relay from being damaged by overvoltage. Wherein, the voltage dependent divider resistance Rf: the design ratio of the voltage-dependent divider resistor Rb is m. Because the signal processing and the relay driving adopt an external power supply, the resistor for voltage division can be a resistor with larger resistance and smaller power. Therefore, the resistance heating is small, the long-term operation can be realized, the insulation resistance relative to the ground is large enough, the current relative to the ground is small enough, and the system state is not influenced.
The voltage comparison circuit 20 is configured to perform interference amount removal processing on the analog quantity voltage value to obtain a processed analog quantity voltage value, amplify the processed analog quantity voltage value to obtain an amplified analog quantity voltage value, and perform analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value; comparing the digital quantity voltage value with a preset voltage value, and generating a control signal according to a comparison result;
and a relay driving circuit 30 for controlling the relay to be closed according to the control signal and outputting a voltage signal according to the closed state of the relay.
In the resistance voltage divider circuit 10, a line voltage is input to one end of a voltage-dependent voltage divider resistor Rf, the other end of the voltage-dependent voltage divider resistor Rf is connected to one end of a voltage-dependent voltage divider resistor Rb and a voltage comparator circuit 20, respectively, and the other end of the voltage-dependent voltage divider resistor Rb is connected to the voltage comparator circuit 20 and grounded.
In this embodiment, the resistance voltage divider circuit 10 divides the line voltage to obtain an analog voltage value; and after the voltage is processed by the voltage comparison circuit 20, a control signal is generated, the relay drive circuit 30 controls the relay to be switched on or switched off according to the control signal, and outputs a voltage signal or a non-voltage signal according to the switching-on state or the switching-off state of the relay, so that the acquisition and judgment functions of the line voltage are realized, the output voltage of the 10kV line voltage or the voltage contact is switched on or switched off to enter the line protection device, and the function of detecting the non-voltage reclosing is realized by matching with the line protection device.
Example two:
fig. 2 is a schematic diagram of a voltage comparison circuit according to a second embodiment of the present invention.
Referring to fig. 2, the voltage comparison circuit includes an acquisition module 22, an amplification module 23, a data conversion module 24, a microprocessor module 25, and a data output module 27;
the acquisition module 22 is respectively connected with the voltage-sensitive divider resistor Rf and the voltage-sensitive divider resistor Rb, and is used for removing the interference from the analog quantity voltage value U1 to obtain a processed analog quantity voltage value;
the amplifying module 23 is connected with the collecting module 22 and is used for amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value;
here, the amplifying module 23 employs two stages of amplifying circuits, the first stage of amplifying circuit is a first operational amplifier, the second stage of amplifying circuit is a second operational amplifier, and the processed analog quantity is amplified twice by the first operational amplifier and the second operational amplifier respectively to obtain an amplified analog quantity voltage value.
The data conversion module 24 is connected with the amplification module 23 and is used for performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value U;
the microprocessor module 25 is connected with the data conversion module 24 and is used for comparing the digital value with a preset voltage value and generating a control signal according to the comparison result;
and a data output module 27 connected to the microprocessor module 25 for outputting a control signal.
Further, the preset voltage value includes a first preset voltage value Uy and a second preset voltage value Uw;
the microprocessor module 25 is further configured to compare the digital value with a first preset voltage value, and generate a first control signal if the digital value is greater than or equal to the first preset voltage value;
here, the line voltage U1 is inputted to the microprocessor module 25 through the voltage comparison circuit, and converted into a digital value U, and when the digital value U is greater than or equal to a first preset voltage value Uy (70% × 57.7V), the voltage comparison circuit outputs a first control signal to drive the relay K1 to operate, so that the three pairs of contacts 1, 2, 3, 4, 5, 6 of the relay K1 are closed, and the 10kV line has a voltage. Referring to fig. 3, the 1, 2 contacts are closed, leading to a 10kV first line protection device as a "line pressure" open function. Referring to fig. 4, the contacts 3 and 4 are closed, a 10kV bus secondary voltage UA (bus a-phase voltage) is connected in series and input to a sampling module UXL (feeder line a-phase voltage) of a 10kV second line protection device as a method for collecting line voltage. Wherein the first joint is 1, the second joint is 2, the third joint is 3, the fourth joint is 4, the fifth joint is 5 and the sixth joint is 6.
According to the voltage detection method of the transformer substation, when a line has pressure, voltage is output to a sampling module UXL of a second line protection device, meanwhile, a pressure contact point is closed, the function of pressing the line to the second line protection device is achieved, the voltage is used for determining the state of the line voltage, and therefore the function of detecting non-pressure reclosing is achieved in cooperation with the line protection device.
Or,
the digital quantity voltage value is compared with a second preset voltage value, and if the digital quantity voltage value is smaller than the second preset voltage value, a second control signal is output;
here, when digital magnitude voltage value U is less than second preset voltage value Uw (30% × 57.7V), the voltage comparison circuit does not output the second control signal, relay K1 does not act, three pairs of contacts 1, 2, 3, 4, 5, 6 are disconnected, 10kV line protection is put into "no voltage detection" reclosing function under the condition of charging 10kV line, no external lockout reclosing is put in, when protection device acts on switch trip, detection device judges that 10kV line is no voltage, within t time, at this moment, 10kV line protection detects no voltage reclosing, realize fast reclosing, guarantee power supply reliability.
The first preset voltage value is 70% of the rated voltage, the second preset voltage value is 30% of the rated voltage, and the rated voltage is 57.7V.
Further, the voltage comparison circuit further comprises a power module 21 and a setting fixed value module 26;
the power module 21 is respectively connected with the acquisition module 22, the amplification module 23, the data conversion module 24, the microprocessor module 25 and the relay drive circuit, and is used for providing a working power supply for the acquisition module 22, the amplification module 23, the data conversion module 24, the microprocessor module 25 and the relay drive circuit;
here, the power module 21 employs an externally accessed 220V DC/AC or 110VDC/AC power, and supplies to each module in the voltage comparison circuit, and the relay drive circuit.
And a setting constant value module 26, configured to determine a voltage state on the line, and perform a function of setting a first preset voltage value and a second preset voltage value of the microprocessor module 25, so as to determine whether a voltage exists on the line.
Here, the setting constant module 26 is used for a relay that can be set as a function of judging whether or not a voltage is present in the line.
Example three:
fig. 5 is a schematic diagram of a relay driving circuit according to a third embodiment of the present invention.
Referring to fig. 5, the relay driving circuit is further configured to control the relay to be closed according to the first control signal, and output a voltage signal according to a closed state of the relay;
or,
and the non-voltage signal is also used for controlling the relay to be switched off under the condition that the second control signal is not output, and outputting the non-voltage signal according to the switching-off state of the relay.
Specifically, the relay driving circuit adopts an externally connected 220V DC/AC or 110VDC/AC power supply, compares the voltage with a first preset voltage value, and outputs a first control signal to drive the relay to act when a digital voltage value (divided voltage) is large, so that a relay output pin is closed to send out a voltage signal. When the line voltage is reduced to be below a certain value, the phase voltage is smaller than a second preset voltage value after being divided by the resistor, the relay coil is powered off by the output signal, the output pin of the relay is disconnected, and the signal is a non-voltage signal.
In a system with the standard voltage of 10kV, the single-phase voltage of the line at the normal moment is 6 kV. When the line phase voltage is higher than a first preset voltage value, the subsequent electric appliance obtains higher voltage through resistance voltage division, and the voltage can drive the relay to act to close an output pin of the relay. At the time of a fault, after a 10kV line switch trips, when the line voltage is lower than a second preset voltage value, the subsequent electric appliance obtains lower voltage through resistance voltage division, at the moment, the voltage is not enough to drive a relay to act, and an output pin of the relay is disconnected.
Further, in the relay driving circuit, a fifth contact of the relay K1 is connected with the resistor R1, and a sixth contact of the relay K1 is connected with the indicator light; when relay K1 is actuated, contacts 5 and 6 are closed, and the indicator lights are turned on.
Further, in the relay drive circuit, the first contact and the second contact of the relay K1 are connected to the first line protection device, respectively.
Further, in the relay drive circuit, the third contact of the relay K1 is connected to the second line protection device, the fourth contact of the relay K1 is connected to the bus voltage, and the bus voltage is connected to the second line protection device.
Specifically, the line voltage is divided by a resistance voltage dividing circuit to obtain an analog quantity voltage value; the analog value is converted into a digital value after passing through a voltage comparison circuit; and the microprocessor module in the voltage comparison circuit compares the digital value with a preset voltage value, wherein the preset voltage value comprises a first preset voltage value and a second preset voltage value. If the digital value is larger than the first preset voltage value, the relay K1 is triggered to act after a certain time delay, so that the 5 and 6 contacts corresponding to the relay K1, the 1 and 2 contacts corresponding to the relay K1 and the 3 and 4 contacts corresponding to the relay K1 are all closed. The 1 and 2 contacts are closed to lead to a protection switching-in module of a 10kV first line protection device, and the protection switching-in module is used as a switching-in function of line voltage and is switched into the first line protection device; 3. the 4 contact is connected in series with a 10kV bus secondary voltage UA in a closed mode, the secondary voltage UA is input into a sampling module UXL of a 10kV second line protection device, and a line voltage collecting method is used as a mode for collecting the line voltage by the line protection device; 5. when the 6 contact is closed, the circuit has pressure, and the indicator light is lighted. The reset button S acts to trigger the relay K2, the device reset signal alarms the relay K1, and the device restores to the normal working state. The reset module is composed of a reset relay, a pressure indicator lamp reset unit, a power supply and a related protection resistor. The resistors R1, R2, R3 are related protection elements (resistors, inductors, capacitors) of the control loop.
The embodiment of the invention provides a voltage detection device of a transformer substation, which comprises: the relay comprises a resistance voltage division circuit, a voltage comparison circuit and a relay drive circuit, wherein the resistance voltage division circuit, the voltage comparison circuit and the relay drive circuit are sequentially connected; the resistance voltage division circuit is used for dividing the line voltage to obtain an analog quantity voltage value; the voltage comparison circuit is used for removing the interference quantity of the analog quantity voltage value to obtain a processed analog quantity voltage value, amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value, and performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value; comparing the digital value with a preset voltage value, and generating a control signal according to the comparison result; the relay driving circuit is used for controlling the relay to be closed according to the control signal and outputting a pressure signal according to the closing state of the relay, and can close a pressure contact under the condition that a line has pressure, so that the function of opening the line protection device under pressure is realized, the condition of line voltage can be acquired in real time, and the function of detecting non-pressure reclosing is realized by matching with the line protection device.
Example four:
fig. 6 is a flowchart of a voltage detection method for a substation according to a fourth embodiment of the present invention.
Referring to fig. 6, the method includes the steps of:
step S101, dividing the line voltage to obtain an analog quantity voltage value;
step S102, carrying out interference amount removal processing on the analog quantity voltage value to obtain a processed analog quantity voltage value;
step S103, amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value;
step S104, performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value;
step S105, comparing the digital value with a preset voltage value, and generating a control signal according to the comparison result;
and S106, controlling the relay to be closed according to the control signal, and outputting a pressure signal according to the closed state of the relay.
The embodiment of the invention provides a voltage detection method of a transformer substation, which comprises the following steps: dividing the line voltage to obtain an analog quantity voltage value; carrying out interference amount removal processing on the analog quantity voltage value to obtain a processed analog quantity voltage value; amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value; performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value; comparing the digital value with a preset voltage value, and generating a control signal according to the comparison result; the relay is controlled to be closed according to the control signal, the pressure signal is output according to the closing state of the relay, the pressure contact is closed under the condition that the line has pressure, the function of opening the line protection device under pressure is realized, the condition of the line voltage can be collected in real time, and the function of detecting the non-pressure reclosing is realized by matching with the line protection device.
The embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program that is stored in the memory and can be run on the processor, and when the processor executes the computer program, the steps of the voltage detection method for a substation provided in the above embodiment are implemented.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the voltage detection method for a substation in the foregoing embodiment are executed.
The computer program product provided in the embodiment of the present invention includes a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, which is not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The voltage detection device of the transformer substation is characterized by comprising a resistance voltage division circuit, a voltage comparison circuit and a relay drive circuit, wherein the resistance voltage division circuit, the voltage comparison circuit and the relay drive circuit are sequentially connected;
the resistance voltage division circuit is used for dividing the line voltage to obtain an analog quantity voltage value;
the voltage comparison circuit is used for removing interference from the analog quantity voltage value to obtain a processed analog quantity voltage value, amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value, and performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value; comparing the digital quantity voltage value with a preset voltage value, and generating a control signal according to a comparison result;
and the relay driving circuit is used for controlling the relay to be closed according to the control signal and outputting a voltage signal according to the closing state of the relay.
2. The voltage detection device of the substation according to claim 1, wherein in the resistance voltage division circuit, one end of a voltage-dependent voltage division resistor Rf is inputted with the line voltage, the other end of the voltage-dependent voltage division resistor Rf is respectively connected with one end of a voltage-dependent voltage division resistor Rb and the voltage comparison circuit, and the other end of the voltage-dependent voltage division resistor Rb is connected with the voltage comparison circuit and grounded.
3. The voltage detection device of the substation according to claim 2, wherein the voltage comparison circuit comprises an acquisition module, an amplification module, a data conversion module, a microprocessor module and a data output module;
the acquisition module is respectively connected with the voltage-sensitive divider resistor Rf and the voltage-sensitive divider resistor Rb and is used for removing the interference of the analog voltage value to obtain a processed analog voltage value;
the amplification module is connected with the acquisition module and is used for amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value;
the data conversion module is connected with the amplification module and used for performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain the digital quantity voltage value;
the microprocessor module is connected with the data conversion module and used for comparing the digital quantity voltage value with a preset voltage value and generating a control signal according to a comparison result;
and the data output module is connected with the microprocessor module and used for outputting the control signal.
4. The voltage detection device of a substation according to claim 3, wherein the preset voltage values comprise a first preset voltage value and a second preset voltage value;
the microprocessor module is also used for comparing the digital value with the first preset voltage value, and generating a first control signal if the digital value is greater than or equal to the first preset voltage value;
or,
the digital quantity voltage value is compared with a second preset voltage value, and if the digital quantity voltage value is smaller than the second preset voltage value, a second control signal is not output;
the first preset voltage value is 70% of rated voltage, the second preset voltage value is 30% of the rated voltage, and the rated voltage is 57.7V.
5. The voltage detection device of the substation according to claim 4, wherein the relay drive circuit is further configured to control the relay to be closed according to the first control signal, and output the voltage signal according to a closed state of the relay;
or,
and the non-voltage signal is also used for controlling the relay to be switched off under the condition that a second control signal is not output, and outputting the non-voltage signal according to the switching-off state of the relay.
6. The voltage detection device of the substation according to claim 5, wherein in the relay drive circuit, a fifth contact of the relay K1 is connected with a resistor R1, and a sixth contact of the relay K1 is connected with an indicator lamp;
when the relay K1 acts, the fifth contact and the sixth contact of the relay K1 are closed, and the indicator lamp is turned on.
7. The voltage detection device of the substation according to claim 6, wherein in the relay drive circuit, the first contact and the second contact of the relay K1 are respectively connected with a first line protection device.
8. The voltage detecting apparatus of a substation according to claim 7, wherein in the relay driving circuit, the third contact of the relay K1 is connected to a second line protection device, and the fourth contact of the relay K1 is connected to a bus voltage, and the bus voltage is connected to the second line protection device.
9. The voltage detection apparatus of a substation according to claim 3, wherein the voltage comparison circuit further comprises a power supply module and a setting constant value module;
the power module is respectively connected with the acquisition module, the amplification module, the data conversion module, the microprocessor module and the relay drive circuit and is used for providing working power for the acquisition module, the amplification module, the data conversion module, the microprocessor module and the relay drive circuit;
and the setting fixed value module is used for determining the voltage state on the line and setting a first preset voltage value and a second preset voltage value of the microprocessor module.
10. A voltage detection method of a substation is characterized by comprising the following steps:
dividing the line voltage to obtain an analog quantity voltage value;
carrying out interference amount removal processing on the analog quantity voltage value to obtain a processed analog quantity voltage value;
amplifying the processed analog quantity voltage value to obtain an amplified analog quantity voltage value;
performing analog-to-digital conversion on the amplified analog quantity voltage value to obtain a digital quantity voltage value;
comparing the digital value with a preset voltage value, and generating a control signal according to a comparison result;
and controlling the relay to be closed according to the control signal, and outputting a pressure signal according to the closed state of the relay.
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Cited By (1)
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|---|---|---|---|---|
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