CN111426865B - PT intelligent blocking device and method for power line - Google Patents

PT intelligent blocking device and method for power line Download PDF

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Publication number
CN111426865B
CN111426865B CN202010260737.2A CN202010260737A CN111426865B CN 111426865 B CN111426865 B CN 111426865B CN 202010260737 A CN202010260737 A CN 202010260737A CN 111426865 B CN111426865 B CN 111426865B
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voltage
blocking device
capacitor
intelligent
electrically connected
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CN111426865A (en
Inventor
刘秀雄
赵法强
黎玉庭
方道奎
谭华章
黎想
王硕
黄琨
林婧
刘雨琪
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Zhuhai Liandian Technology Co ltd
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Zhuhai Liandian Technology Co ltd
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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
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a PT intelligent blocking device and a method for a power line, belonging to the technical field of blocking devices, comprising an internal integrated main body, a high-voltage relay and an intelligent control module, wherein the intelligent control module is internally provided with an intelligent control circuit which consists of a singlechip and a high-voltage relay control circuit part, the invention is scientific and reasonable, is safe and convenient to use, has different precision values of a metering PT, a measuring PT and a power supply PT according to theoretical calculation and actual test, and has different capacitance values of the blocking devices required to be connected in series, so that at least three types of blocking devices with different capacitance values are required to meet the requirement, and the PT intelligent blocking device can control the working states of 5 high-voltage relays through the singlechip according to different situations to achieve the required capacitance value without producing the blocking devices with different capacitance values according to different situations, the PT is ensured not to be manually disconnected during AC/DC detection, and the normal operation of the line is not influenced.

Description

PT intelligent blocking device and method for power line
Technical Field
The invention relates to the technical field of blockers, in particular to a PT intelligent blocking device and a PT intelligent blocking method for a power line.
Background
A voltage transformer (PT for short) is a very important device on a power line, and is generally classified into a metering type PT, a measuring type PT, a switching operation power supply type PT, and the like, wherein the metering type PT has the highest requirement on precision, and is 0.2 grade; PT-like measurement is 0.5 grade; the PT requirement of a switch operation power supply type is the lowest grade, which is 1.5, when a power line is subjected to fault detection through direct current trial feeding (such as an insulation megger, a direct current trial feeding instrument and the like, which are called as direct current instruments for short, and the same below), direct current voltage which is tried to be sent is directly short-circuited to the ground by the online PT due to the characteristic of isolating alternating current and direct current, so that the direct current instrument cannot be boosted normally for detection.
Disclosure of Invention
The invention aims to provide a PT intelligent blocking device and a PT intelligent blocking method for a power line, which aim to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a blocker for an electrical power line, characterized by: the blocker comprises a blocker main body, wherein a capacitance element is arranged in the blocker main body, the capacitance values of the capacitance element are different according to different application scenes, so that the capacitance values of the blocker are different, the blocker is suitable for a metering PT, a measuring PT and a switch operation power supply PT, the precision value required by the metering PT is 0.2 grade, the precision value required by the measuring PT is 0.5 grade, the precision value required by the power supply PT is 1.5 grade, the capacitance value of the blocker connected in series is 0.63 uF-0.72 uF when the blocker is suitable for the metering PT according to the precision value and actual test, the capacitance value of the blocker connected in series is 0.25 uF-0.50 uF when the blocker is suitable for the measuring PT, and the capacitance value of the blocker connected in series is 0.08 uF-0.25 uF when the blocker is suitable for the power supply PT;
the blocker can be used independently or integrated into the PT to be used as the PT with the blocking function;
the accuracy of PT cannot be affected by the blocker which is connected into the capacitance value in the corresponding range according to different applicable conditions.
As a preferred technical scheme, the blocker main body is formed by rolling a solid medium and an aluminum foil electrode, a capacitance element is arranged in the blocker main body and is divided into a capacitor and a capacitor core, the capacitor core is connected in series and in parallel by different capacitors so as to obtain a required capacitance value, and a fuse wire is arranged on the capacitance element;
in order to meet the high-voltage working environment, the blocker main body is formed by rolling a solid medium and an aluminum foil electrode, a capacitor element is arranged in the blocker main body and is divided into a capacitor and a capacitor core, the capacitor core is connected in series and in parallel by different capacitors to obtain a required capacitance value, a fuse wire is arranged on the capacitor element and is used for internal short-circuit protection of the capacitor, when a certain element breaks down, other intact elements discharge electricity to the capacitor element, the fuse wire is rapidly fused within millisecond-level time, and a fault element is cut off, so that the blocker can continuously and normally work.
The utility model provides a PT intelligence blocking device for power line which characterized in that: the PT intelligent blocking device is internally integrated with a main body, a high-voltage relay, a power supply module, a communication module setting key and an intelligent control module, wherein an intelligent control circuit is arranged in the intelligent control module and consists of a single chip microcomputer, a high-voltage relay control circuit, a setting circuit and the like;
the PT intelligent blocking device can be used independently or integrated into all electric PT on the market to be used as a novel PT with an intelligent blocking function, the novel PT with the intelligent blocking function is divided into PT-1 and PT-2, when the PT intelligent blocking device is used independently, the PT intelligent blocking device can be connected between an original PT and a main line or arranged between a PT neutral point and the ground when in use, when the PT smart cut-off device is integrated into a PT for use as a new type PT with a smart cut-off function, the PT intelligent blocking devices are divided into PT-1 and PT-2 according to the position of the PT intelligent blocking devices integrated into the PT, the PT-1 is the PT smart cut-off device integrated into the PT and installed between the PT and the main line, the PT-2 is that the PT intelligent blocking device is integrated into a PT and the installation position is located between a PT neutral point and the ground;
PT intelligence blocking device internal integration 3 capacitance values are 0.2 uF's main part, 5 high-voltage relay, power module, set key and intelligent control module, power module adopts the mode that CT got the electricity, the inside intelligent control circuit that is provided with of intelligent control module, intelligent control circuit comprises parts such as singlechip, high-voltage relay control circuit, set circuit, high-voltage relay's operating condition is controlled by the singlechip, according to different situations, controls 5 high-voltage relay's operating condition to reach required capacitance value, and need not produce the blocker of different capacitance values according to the different situations, reduce troublesome.
According to a preferable technical scheme, the PT intelligent blocking device is electrically connected between a PT and a main line or between a PT neutral point and the ground, and the main line comprises three phases of L1, L2 and L3;
the PT intelligent blocking device is electrically connected between a PT and a main line or between a PT neutral point and the ground, when the main line works normally, the PT intelligent blocking device automatically bypasses, short-circuits the PT and the main line or short-circuits the PT neutral point and the ground, normal output of the PT is ensured, and the precision of the PT intelligent blocking device is not influenced; when needing to detect the main line through carrying direct current voltage, PT intelligence blocking device automatic disconnection PT (or PT neutral point and ground) is connected, do not let direct current voltage ground, ensure that direct current instrument can normally test, when needing to detect the main line through carrying alternating current voltage, PT intelligence blocking device automatic bypass, short circuit PT and main line or short circuit PT neutral point and ground, ensure to detect normally going on, even if there is the additional signal that is used for monitoring on the main line, the blocker can automatic recovery PT (or PT neutral point) bypass, let monitoring signal normally pass through, this blocker technical usable range is extensive, can integrate in all electric power PT on the market.
As a preferred technical scheme, the main capacitance value integrated in the intelligent blocker is 0.2uF, the number of the high-voltage relays is 5, and the power module adopts a CT power-taking mode;
the intelligent blocking device is internally integrated, the main capacitance value is 0.2uF, the number of the high-voltage relays is 5, the working states of the high-voltage relays are controlled by a single chip microcomputer, and the working states of the 5 high-voltage relays are controlled according to different situations, so that the required capacitance value is achieved.
As a preferable technical solution, an input voltage of the power module is +12V, and after DC conversion and voltage reduction in the power module, an output voltage is +3.3V, a circuit in the power module includes a diode D1, a capacitor C2, a regulated power supply chip N3, a capacitor C3, a capacitor C4, a regulated power supply chip N4, a capacitor C5 and a capacitor C6, an anode of the diode D1 is electrically connected to +12VDC, a cathode of the diode D1 is electrically connected to a first end of the capacitor C2 and a third pin of the regulated power supply chip N3, a second end of the capacitor C2 is electrically connected to ground, a first pin of the regulated power supply chip N3 is electrically connected to ground, a second pin of the regulated power supply chip N3 is electrically connected to a fourth pin of the regulated power supply chip N3, a first end of the capacitor C3, a first end of the capacitor C4 and a third pin of the regulated power supply chip N4, and a second end of the capacitor C3 is electrically connected to ground, the second end of the capacitor C4 is electrically connected with the ground, the first pin of the voltage stabilizing power supply chip N4 is electrically connected with the ground, the second pin of the voltage stabilizing power supply chip N4 is electrically connected with the fourth pin of the voltage stabilizing power supply chip N4, the first end of the capacitor C5, the first end of the capacitor C6 and +3.3VDC, the second end of the capacitor C5 is electrically connected with the ground, and the second end of the capacitor C6 is electrically connected with the ground.
The input voltage of the power supply module is +12V, the input voltage is subjected to DC conversion of the power supply module, the output voltage after voltage reduction is +3.3V, and the output voltage is +3.3V and can be electrically connected with a seventh pin of the single chip microcomputer, an eighth pin of the single chip microcomputer, a thirteenth pin of the single chip microcomputer and a thirty-second pin of the single chip microcomputer.
As a preferable technical scheme, the setting keys are divided into three types of 0.63uF, 0.3uF and 0.2uF, the circuit of the setting keys of 0.63uF comprises a setting switch S3 and a resistor R20, the first end of the switch S3 is electrically connected with the ground, the second end of the switch S3 is electrically connected with the first end of the resistor R20 and the thirty-fourth pin of the single chip microcomputer, the second end of the resistor R20 is electrically connected with +3.3VDC, and the setting keys of 0.3uF and 0.2uF are electrically connected with the setting keys of 0.63uF in the same way.
The 0.3uF circuit for setting the key comprises a setting switch S2 and a resistor R15, wherein a first end of a switch S2 is electrically connected with the ground, a second end of a switch S2 is electrically connected with a first end of a resistor R15 and a thirty-third pin of a single chip microcomputer, a second end of a resistor R15 is electrically connected with +3.3VDC, a 0.2uF circuit for setting the key comprises a setting switch S1 and a resistor R14, a first end of the switch S1 is electrically connected with the ground, a second end of a switch S1 is electrically connected with a first end of a resistor R14 and a thirty-third pin of the single chip microcomputer, a second end of a resistor R15 is electrically connected with +3.3VDC, and a second end of the resistor R15 is electrically connected with a seventh pin of the single chip microcomputer, an eighth pin of the single chip microcomputer, a thirteenth pin of the single chip microcomputer and a thirty-second pin of the single chip microcomputer.
As a preferred technical solution, the power module is connected to the filter module, a circuit of the filter module includes a capacitor C8, a capacitor C9, and a capacitor C10, a first end of the capacitor C8 is electrically connected to ground, a second end of the capacitor C8 is electrically connected to +3.3VDC, a second end of the capacitor C9, and a second end of the capacitor C10, a first end of the capacitor C9 is electrically connected to ground, and a first end of the capacitor C10 is electrically connected to ground.
The filtering module can filter the waveform of the power supply module after DC conversion, so as to achieve the purpose of removing clutter.
As a preferable technical solution, the high voltage relay includes a high voltage relay a, a high voltage relay B, a high voltage relay C, a high voltage relay D and a high voltage relay E, wherein a circuit of the high voltage relay a includes a resistor R35, a transistor Q4, a diode D2, a relay K1 and a high voltage relay GK1, a first end of the resistor R35 is electrically connected with a forty first pin of the single chip microcomputer, a second end of the resistor R35 is electrically connected with a base of the transistor Q4, an emitter of the transistor Q4 is grounded, a collector of the transistor Q4 is electrically connected with a positive electrode of a diode D2 and a first end of a relay K1, a negative electrode of the diode D2 is electrically connected with a second end of the relay K1 and +12VDC, a third end of the relay K1 is electrically connected with ground and a first end of the high voltage relay GK1, a fourth end of the relay K1 is electrically connected with a second end of the high voltage relay GK1 and +24VDC, and a third end of the high voltage relay GK1 is electrically connected with an output terminal, the fourth end of the high-voltage relay GK1 is electrically connected with the input end, and the circuit connection modes of the high-voltage relay B, the high-voltage relay C, the high-voltage relay D and the high-voltage relay E are the same as those of the high-voltage relay A;
and the singlechip controls the on-off of the five relays K1-K5 according to a preset program according to a conducted setting key, and further controls the on-off of the five corresponding high-voltage relays GK 1-GK 5, so that the capacitance value of the PT intelligent blocking device is set.
A PT intelligent blocking method for a power line is characterized by comprising the following steps: the PT intelligent blocking method for the power line comprises three steps, namely: when the PT intelligent blocking device is used independently, the PT intelligent blocking device is installed between the original PT and a main line or between a PT neutral point and the ground for use; when the PT intelligent blocking device is integrated into a PT to be used as a novel PT with an intelligent blocking function, the PT intelligent blocking device is divided into a PT-1 and a PT-2 according to the difference of the positions of the PT intelligent blocking device integrated into the PT, the PT-1 is the PT intelligent blocking device integrated into the PT, the installation position of the PT intelligent blocking device is located between the PT and a main line, the PT-2 is the PT intelligent blocking device integrated into the PT, the installation position of the PT intelligent blocking device is located between a PT neutral point and the ground, if the PT-1 is connected with the main line for use, and if the PT-2 is connected with the main line for use; the second step is that: dialing different setting keys according to different capacitance values required by the state; the third step: when a setting key is turned on, the single chip controls the on-off of the relay according to the turned-on setting key and a preset program, so that the on-off of the corresponding high-voltage relay is controlled, and the purpose of setting the capacitance value of the PT intelligent blocking device is achieved.
When a setting key is turned on, the single chip controls the on-off of the relays according to the turned-on setting key and a preset program, and then controls the on-off of the corresponding high-voltage relays, and the single chip controls the on-off of the five relays K1-K5 according to the preset program, and then controls the on-off of the five corresponding high-voltage relays GK 1-GK 5, so that the capacitance value of the blocking device is set, and the purpose of setting the capacitance value of the PT intelligent blocking device is achieved.
As a preferred technical scheme, 3 main bodies with the capacitance value of 0.2uF, 5 high-voltage relays, a power supply module, a setting key and an intelligent control module are integrated in the PT intelligent blocking device, the power supply module adopts a CT power taking mode, an intelligent control circuit is arranged in the intelligent control module and consists of a single chip microcomputer, a high-voltage relay control circuit, a setting circuit and the like, and the single chip microcomputer can control the working state of the high-voltage relays, so that the capacitance value of the PT intelligent blocking device is set; when the main line normally works, the PT intelligent blocking device automatically bypasses, short-circuits PT and the main line or short-circuits PT neutral point and the ground, when the main line needs to be detected by transmitting direct-current voltage, the PT intelligent blocking device automatically disconnects PT (or PT neutral point and the ground), and when the main line needs to be detected by transmitting alternating-current voltage, the PT intelligent blocking device automatically bypasses, short-circuits PT and the main line or short-circuits PT neutral point and the ground;
the PT intelligent blocking method for the power line can ensure normal output of PT when a main line works normally without influencing the precision of the PT; when needing to detect the main line through carrying direct current voltage, PT intelligence blocking device automatic disconnection PT (or PT neutral point and ground) is connected, do not let direct current voltage ground, ensure that direct current instrument can normally test, when needing to detect the main line through carrying alternating current voltage, PT intelligence blocking device automatic bypass, short circuit PT and main line or short circuit PT neutral point and ground, ensure to detect normally going on, even if there is the additional signal that is used for monitoring on the main line, the blocker can automatic recovery PT (or PT neutral point and ground) bypass, let the monitoring signal normally pass through, PT intelligence blocking device can the exclusive use, also can integrate in all electric power PT on the market, become the novel PT that takes intelligence to block the function and use.
As a preferred technical scheme, a singlechip is arranged in the PT intelligent blocking device, corresponding different setting keys are arranged on the singlechip according to different situations, and when one setting key is switched on, the singlechip sets a capacitance value of a blocking device according to the switched-on setting key;
the PT intelligent blocking device is internally provided with a high-voltage relay, the working state of the high-voltage relay is controlled by a single chip microcomputer, and the working state of the high-voltage relay can be adjusted according to different situations, so that the required capacitance value is achieved, the blocking devices with different capacitance values do not need to be produced according to different conditions, and the trouble is reduced.
As a preferred technical scheme, 3 main bodies with the capacitance value of 0.2uF, 5 high-voltage relays, a power supply module, a setting key and an intelligent control module are integrated in the PT intelligent blocking device, wherein the 5 high-voltage relays are A, B, C, D, E respectively, and when the PT intelligent blocking device is used for switching operation of a power supply type PT, all the high-voltage relays A-B-C-D-E are switched off; when the blocker is used for measuring the similar PT, the high-voltage relays A-E-D are switched on, and the high-voltage relays B-C are switched off; when the blocker is used for metering PT, the high-voltage relay A-B-C-D is switched on, and the high-voltage relay E is switched off;
when the PT intelligent blocking device is used for switching operation power supply PT, the precision value (1.5 level) of the power supply PT is 0.20uF, all high-voltage relays A-B-C-D-E are switched off, and the capacitance value of the PT intelligent blocking device is 0.20 uF; when the blocking device is used for measuring the PT-like, the precision value (0.5 level) of the PT-like is measured, the capacitance value of the blocking device connected in series is 0.30uF, the high-voltage relays A-E-D are switched on, the high-voltage relays B-C are switched off, and the capacitance value of the PT intelligent blocking device is 0.20 uF; when the blocking device is used for metering PT, the precision value (0.2 level) of the metering PT is 0.63uF, the capacitance value of the blocking device connected in series is 0.63uF, the high-voltage relays A-B-C-D are switched on, the high-voltage relays E are switched off, and the capacitance value of the PT intelligent blocking device is 0.63 uF; in conclusion, 3 types of blockers with different capacitance values do not need to be connected in series, and the capacitance of the PT intelligent blocking device can be adjusted according to different requirements, so that convenience is realized.
Compared with the prior art, the invention has the beneficial effects that: when the fault of the power line is detected by the direct current trial transmission (such as an insulation megger, a direct current trial transmission instrument, etc., which are called as direct current instruments for short, the same below), the direct current voltage of the trial transmission is directly connected to the ground by the online PT due to the characteristic of isolating the alternating current and the direct current, so that the direct current instrument can not normally boost the voltage for detection, the PT is firstly disconnected before the detection is carried out, then the direct current voltage is tried to be transmitted, the work is complicated, the efficiency is low, and the electricity utilization of a user side is influenced, the invention can ensure that the PT does not need to be manually disconnected during the alternating current/direct current detection, the normal operation of the line is not influenced, the operation is flexible and convenient, the interrupters with different capacitance values do not need to be replaced according to the types of metering type, measuring type and power type PT, the working state of the high-voltage relay is changed by field setting, and the capacitance value of the PT intelligent interrupters is switched to the specified value, in the invention, the PT intelligent blocking device can be used independently, and can also be integrated into all electric PTs on the market to be used as a novel PT with an intelligent blocking function.
Drawings
Fig. 1 is a schematic structural diagram of a blocker principle 1 of a PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 2 is a schematic structural diagram of a blocker principle 2 of the PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 3 is a schematic structural diagram of a novel PT-1 with an intelligent blocking function for a PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 4 is a schematic structural view of a novel PT-2 with an intelligent blocking function for an intelligent PT blocking apparatus and method for an electric power line according to the present invention;
fig. 5 is a schematic structural diagram of a blocking device with a capacitance of 0.63uF for the PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 6 is a schematic structural diagram of a blocking device with a capacitance of 0.3uF for the PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 7 is a schematic structural diagram of a blocking device with a capacitance of 0.2uF for the PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 8 is a schematic diagram of the internal schematic structure of an intelligent blocking device for the intelligent PT blocking apparatus and method of the power line according to the present invention;
fig. 9 is a schematic diagram of an internal circuit structure of a power module of the PT intelligent blocking apparatus and method for a power line according to the present invention;
fig. 10 is a schematic diagram of an internal circuit structure of a filtering module of the PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 11 is a schematic diagram of an internal circuit structure of a set key of the PT intelligent blocking apparatus and method for an electric power line according to the present invention;
fig. 12 is a schematic diagram of a single chip microcomputer structure of the PT intelligent blocking device and method for an electric power line according to the present invention;
fig. 13 is a schematic diagram of an internal circuit structure of a high-voltage relay a for the intelligent PT blocking device and method for an electric power line according to the present invention;
fig. 14 is a schematic diagram of an internal circuit structure of a high-voltage relay B for the intelligent PT blocking apparatus and method for power lines according to the present invention;
fig. 15 is a schematic diagram of an internal circuit structure of a high-voltage relay C according to the intelligent PT blocking apparatus and method for an electric power line of the present invention;
fig. 16 is a schematic diagram of an internal circuit structure of a high-voltage relay D according to the intelligent PT blocking apparatus and method for an electric power line of the present invention;
fig. 17 is a schematic diagram of an internal circuit structure of a high-voltage relay E of the intelligent PT blocking device and method for a power line according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b): as shown in fig. 1-17, a blocker for an electrical power line, characterized by: the blocker comprises a blocker main body, wherein a capacitance element is arranged in the blocker main body, the capacitance values of the capacitance element are different according to different application scenes, so that the capacitance values of the blocker are different, the blocker is suitable for a metering PT, a measuring PT and a switch operation power supply PT, the precision value required by the metering PT is 0.2 grade, the precision value required by the measuring PT is 0.5 grade, the precision value required by the power supply PT is 1.5 grade, the capacitance value of the blocker connected in series is 0.63 uF-0.72 uF when the blocker is suitable for the measuring PT, the capacitance value of the blocker connected in series is 0.25 uF-0.50 uF when the blocker is suitable for the measuring PT, and the capacitance value of the blocker connected in series is 0.08 uF-0.25 uF when the blocker is suitable for the power supply PT;
the blocker may be used alone or integrated into a PT for use as a PT with a blocking function.
Under the condition of not using PT intelligent blocking device, in order to satisfy metering class, measurement class and power supply class PT, at least three types of blocking devices with different capacitance values are required to meet the requirements, and the specific theoretical derivation is as follows:
1) blocker capacitance value calculation for a metrological class 0.2 PT:
at present, the inductance of a great deal of JDZ10-10 type 0.2 grade PT used for 10KV and below of distribution network is about 8000H
Taking f as 50Hz, the inductive reactance of the circuit: x is the number ofL＝2πfL＝314×8000H＝2512000Ω；
Capacitive reactance of the circuit:
Figure BDA0002439192170000141
impedance value in the circuit:
Figure BDA0002439192170000142
since the blockers are connected in series between PT and the main line or PT neutral and ground, in the series circuit, the ratio of voltage occupied by the blockers:
Figure BDA0002439192170000143
since the accuracy of the PT cannot be affected after the tandem-in blocker, it still needs to be maintained at level 0.2, i.e., m ≦ 0.2%.
Substituting the above equation yields: c is more than or equal to 0.63uF, and 0.63uF is taken.
2) Blocker capacitance value calculation for a metric class 0.5 PT:
at present, the inductance of a great deal of JDZ10-10 type 0.5 grade PT used for 10KV and below of distribution network is about 8000H
Taking f as 50Hz, the inductive reactance of the circuit: x is the number ofL＝2πfL＝314×8000H＝2512000Ω；
Capacitive reactance of the circuit:
Figure BDA0002439192170000144
impedance value in the circuit:
Figure BDA0002439192170000145
since the blockers are connected in series between PT and the main line or PT neutral and ground, in the series circuit, the ratio of voltage occupied by the blockers:
Figure BDA0002439192170000151
since the accuracy of the PT cannot be affected after the tandem-in blocker, it still needs to be maintained at 0.5 level, i.e., m ≦ 0.5%.
Substituting the above equation yields: c is more than or equal to 0.25uF, and 0.3uF is taken.
3) Blocker capacitance value calculation for metrological class 1.5 PT:
similarly, substituting m of not more than 1.5% into C of not less than 0.08uF, and taking 0.2 uF.
4) And (3) analyzing the possibility of circuit resonance after the circuit is connected into the blocker in series:
the operating frequency of the existing power grid is 50Hz, the capacitance values of the series-connection blocker are 0.63uF, 0.3uF and 0.2uF respectively, and the corresponding resonant frequencies are as follows:
when the capacitance value of the blocker is 0.63uF, the resonant frequency is
Figure BDA0002439192170000152
When the capacitance value of the blocker is 0.3uF, the resonant frequency is
Figure BDA0002439192170000153
When the capacitance value of the blocker is 0.2uF, the resonant frequency is
Figure BDA0002439192170000154
Therefore, the conclusion can be drawn that the difference between the frequency of the resonance generated by the circuit after the circuit is connected in series with the blocker and the power frequency is very large, and the resonance cannot be generated;
therefore, according to theoretical calculation and actual test, in order to not influence the precision value (0.2 level) of the metering PT, the capacitance value of the serially connected blocker is 0.63 uF-0.72 uF, and 0.63uF is taken; in order not to influence the precision value (0.5 grade) of the measurement class PT, the capacitance value of the blocker connected in series is 0.25 uF-0.50 uF, and 0.30uF is taken; in order not to affect the precision value (1.5 grade) of the switch operation power supply class PT, the capacitance value of the blocker connected in series is 0.08 uF-0.25 uF, and is 0.20 uF.
The blocker main body is formed by rolling a solid medium and an aluminum foil electrode, a capacitance element is arranged in the blocker main body and is divided into a capacitor and a capacitor core, the capacitor core is connected in series and in parallel by different capacitors, so that the required capacitance value is obtained, and a fuse wire is arranged on the capacitance element.
The capacitor core is not limited to the capacitor, but also comprises the capacitor core obtained by connecting different capacitors in series and in parallel; in order to meet the high-voltage working environment, the blocker main body is formed by rolling a solid medium and an aluminum foil electrode, a capacitor element is arranged in the blocker main body and is divided into a capacitor and a capacitor core, the capacitor core is connected in series and in parallel by different capacitors to obtain a required capacitance value, a fuse wire is arranged on the capacitor element and is used for internal short-circuit protection of the capacitor, when a certain element breaks down, other intact elements discharge electricity to the capacitor element, the fuse wire is rapidly fused within millisecond-level time, and a fault element is cut off, so that the blocker can continuously and normally work.
The utility model provides a PT intelligence blocking device for power line which characterized in that: the PT intelligent blocking device is internally integrated with a main body, a high-voltage relay, a power supply module, a setting key and an intelligent control module, wherein an intelligent control circuit is arranged in the intelligent control module and consists of a single chip microcomputer, a high-voltage relay control circuit, a setting circuit and the like;
the PT intelligent blocking device can be used independently or integrated into all electric power PTs on the market, the PT with the intelligent blocking function is divided into PT-1 and PT-2, when the PT intelligent blocking device is used independently, the PT intelligent blocking device can be connected between the original PT and a main line or arranged between a PT neutral point and the ground when in use, when the PT smart cut-off apparatus is integrated into a PT for use as a new type PT with a smart cut-off function, according to the difference of the integration position of the PT intelligent blocking device into the PT, the PT intelligent blocking device is divided into a PT-1 and a PT-2, the PT-1 is the PT intelligent blocking device integrated into the PT and the installation position is positioned between the PT and the main line, and the PT-2 is the PT intelligent blocking device integrated into the PT and the installation position is positioned between the PT neutral point and the ground.
DC is direct current of +12V, PT is called as voltage transformer, which is used to transform voltage on line, and can be used to supply power to measuring instrument and relay protection device, measure voltage, power and electric energy of line, or protect valuable equipment, motor and transformer in line when line is in fault; this PT intelligence blocking device internal integration 3 capacitance values are 0.2 uF's main part, 5 high voltage relay, power module, set key and intelligent control module, power module adopts the mode that CT got the electricity, the inside intelligent control circuit that is provided with of intelligent control module, intelligent control circuit is by the singlechip, high voltage relay control circuit, it constitutes to set up parts such as circuit, high voltage relay's operating condition is controlled by the singlechip, according to different situations, control 5 high voltage relay's operating condition, thereby reach required capacitance value, and need not produce the blocker of different capacitance values according to the different situations, it is troublesome to reduce.
If the PT intelligent blocking device is used, in order to consider the consistency of products, an intelligent control circuit needs to be integrated in the blocking device, so that capacitance values of different types of PTs can be conveniently set in field use, and the PT intelligent blocking device is flexible and convenient; for better control, a power module control module needs to be integrated in the PT intelligent blocking device, and the working state of the high-voltage relay is changed through field setting according to the field PT type, so that the capacitance value of the PT intelligent blocking device is switched to a specified value.
The single chip microcomputer adopts STM8S207C8T6, S1-S3 are setting keys of 0.63uF, 0.3uF and 0.2uF, when one setting key is switched on, the single chip microcomputer controls the on-off of the five relays K1-K5 according to a preset program according to the switched-on setting key, and further controls the on-off of the corresponding five high-voltage relays GK 1-GK 5, so that the capacitance value of the blocker is set. The high-voltage relay adopts HVR24-1A10-300 and DC24V for power supply, can be used for a10 KV high-voltage line, and the following table is a working chart of the high-voltage relay in the PT intelligent blocking device:
Figure BDA0002439192170000181
when the blocker is used for switching operation power supply type PT, the high-voltage relays A-B-C-D-E are all disconnected; when the blocker is used for measuring the similar PT, the high-voltage relays A-E-D are switched on, and the high-voltage relays B-C are switched off; when the blocking device is used for metering PT, the high-voltage relays A-B-C-D are switched on, and the high-voltage relays E are switched off.
The PT intelligent blocking device is electrically connected between a PT and a main line or between a PT neutral point and the ground, and the main line comprises three phases of L1, L2 and L3.
The PT intelligent blocking device is electrically connected between a PT and a main line or between a PT neutral point and the ground, when the main line works normally, the PT intelligent blocking device automatically bypasses, short-circuits the PT and the main line or short-circuits the PT neutral point and the ground, normal output of the PT is ensured, and the precision of the PT intelligent blocking device is not influenced; when needing to detect the main line through carrying direct current voltage, PT intelligence blocking device automatic disconnection PT (or PT neutral point and ground) is connected, do not let direct current voltage ground, ensure that direct current instrument can normally test, when needing to detect the main line through carrying alternating current voltage, PT intelligence blocking device automatic bypass, short circuit PT and main line or short circuit PT neutral point and ground, ensure to detect normally going on, even if there is the additional signal that is used for the monitoring on the main line, the blocker can automatic recovery PT (or PT neutral point and ground) bypass, let monitoring signal normally pass through, this blocker technique usable range is extensive, not only can the exclusive use, also can integrate in all electric power PT on the market, become the novel PT that takes intelligence to block the function and use.
The inside integrated main part capacitance value of intelligence blocker is 0.2uF, and high-voltage relay quantity is 5, and power module adopts CT to get the electric mode.
The inside integrated main part capacitance value of intelligence blocker is 0.2uF, and high voltage relay quantity is 5, and high voltage relay's operating condition is controlled by the singlechip, according to different situation, controls 5 high voltage relay's operating condition to reach required capacitance value.
The input voltage of the power module is +12V, after DC conversion and voltage reduction in the power module, the output voltage is +3.3V, the circuit in the power module comprises a diode D1, a capacitor C2, a stabilized voltage power supply chip N3, a capacitor C3, a capacitor C4, a stabilized voltage power supply chip N4, a capacitor C5 and a capacitor C6, the anode of the diode D1 is electrically connected with +12VDC, the cathode of the diode D1 is electrically connected with the first end of the capacitor C2 and the third pin of the stabilized voltage power supply chip N3 respectively, the second end of the capacitor C2 is electrically connected with the ground, the first pin of the stabilized voltage power supply chip N3 is electrically connected with the ground, the second pin of the stabilized voltage power supply chip N3 is electrically connected with the fourth pin of the stabilized voltage power supply chip N3, the first end of the capacitor C3, the first end of the capacitor C4 and the third pin of the stabilized voltage power supply chip N4, the second end of the capacitor C3 is electrically connected with the ground, the second end of the capacitor C4 is electrically connected with the ground, the first pin of the stabilized voltage power supply chip N4, the second pin of the voltage-stabilizing power chip N4 is electrically connected with the fourth pin of the voltage-stabilizing power chip N4, the first end of the capacitor C5, the first end of the capacitor C6 and +3.3VDC, the second end of the capacitor C5 is electrically connected with the ground, and the second end of the capacitor C6 is electrically connected with the ground.
The capacitance value of the capacitor C2 is 1uF, the capacitance value of the capacitor C3 is 1uF, the capacitance value of the capacitor C4 is 10nF, the capacitance value of the capacitor C5 is 1uF, the capacitance value of the capacitor C6 is 10nF, the model of the capacitor N3 is AMS1117-5.0, the model of the capacitor N4 is AMS1117-3.3, the input voltage of the power module is +12V, the input voltage is subjected to DC conversion of the power module, and the output voltage is +3.3V after voltage reduction, so that the power module can be electrically connected with a +3.3V pin on the single chip microcomputer.
The setting keys are divided into three types of 0.63uF, 0.3uF and 0.2uF, the circuit of the setting key of 0.63uF comprises a setting switch S3 and a resistor R20, the first end of the switch S3 is electrically connected with the ground, the second end of the switch S3 is electrically connected with the first end of the resistor R20 and the thirty-fourth pin of the single chip microcomputer, the second end of the resistor R20 is electrically connected with the resistor with +3.3VDC, and the circuit connection modes of the setting key of 0.3uF and the setting key of 0.2uF are the same as the circuit connection mode of the setting key of 0.63 uF.
The resistance values of the resistor R20, the resistor R15 and the resistor R14 are 2K, the circuit of the setting key of 0.3uF comprises a setting switch S2 and a resistor R15, the first end of the switch S2 is electrically connected with the ground, the second end of the switch S2 is electrically connected with the first end of the resistor R15 and the thirty-third pin of the single chip microcomputer, the second end of the resistor R15 is electrically connected with +3.3VDC, the circuit of the setting key of 0.2uF comprises a setting switch S1 and a resistor R14, the first end of the switch S1 is electrically connected with the ground, the second end of the switch S1 is electrically connected with the first end of the resistor R14 and the thirty-third pin of the single chip microcomputer, and the second end of the resistor R15 is electrically connected with +3.3 VDC.
The power module is connected with the filtering module, a circuit of the filtering module comprises a capacitor C8, a capacitor C9 and a capacitor C10, a first end of the capacitor C8 is electrically connected with the ground, a second end of the capacitor C8 is electrically connected with +3.3VDC, a second end of the capacitor C9 and a second end of the capacitor C10, a first end of the capacitor C9 is electrically connected with the ground, and a first end of the capacitor C10 is electrically connected with the ground.
The capacitance values of the capacitor C8, the capacitor C9 and the capacitor C10 are all 100nF, and the filtering module can filter waveforms of the power module after DC conversion, so that the purpose of removing noise waves is achieved.
The high-voltage relay comprises a high-voltage relay A, a high-voltage relay B, a high-voltage relay C, a high-voltage relay D and a high-voltage relay E, the circuit of the high-voltage relay A comprises a resistor R35, a triode Q4, a diode D2, a relay K1 and a high-voltage relay GK1, a first end of the resistor R35 is electrically connected with a forty-first pin of the single chip microcomputer, a second end of the resistor R35 is electrically connected with a base of a triode Q4, an emitter of the triode Q4 is grounded, a collector of the triode Q4 is electrically connected with a positive electrode of the diode D2 and a first end of the relay K1, a negative electrode of the diode D2 is electrically connected with a second end of the relay K1 and +12VDC, a third end of the relay K1 is electrically connected with the ground and the first end of the high-voltage relay GK1, a fourth end of the relay K1 is electrically connected with a second end of the high-voltage relay GK1 and +24VDC, a third end of the high-voltage relay GK1 is electrically connected with an output end, and a fourth end of the high-voltage relay GK1 is electrically connected with an input end.
The type of the diode D2 is IN4001, the resistance value of the resistor R35 is 2K, the type of the relay K1 is NT77-A12DC12V, the type of the high-voltage relay GK1 is HVR24-1A10-300, the singlechip controls the on-off of the five relays K1-K5 according to a preset program according to a conducted setting key, and further controls the on-off of the corresponding five high-voltage relays GK 1-GK 5, so that the capacitance value of the PT intelligent blocking device is set, the high-voltage relays GK 1-GK 5 are powered by the DC24V, and the PT intelligent blocking device can be used for a10 KV high-voltage line, and the circuit connection mode of the high-voltage relay B, the high-voltage relay C, the high-voltage relay D and the high-voltage relay E is the same as that of the high-voltage relay A.
A PT intelligent blocking method for a power line is characterized by comprising the following steps: the PT intelligent blocking method for the power line comprises three steps, namely: when the PT intelligent blocking device is used independently, the PT intelligent blocking device is installed between the original PT and a main line or between a PT neutral point and the ground for use; when the PT intelligent blocking device is integrated into the PT to be used as a novel PT with an intelligent blocking function, the PT intelligent blocking device is divided into PT-1 and PT-2 according to the difference of the positions of the PT intelligent blocking device integrated into the PT, the PT-1 is the PT intelligent blocking device integrated into the PT and the installation position is positioned between the PT and a main line, the PT-2 is the PT intelligent blocking device integrated into the PT and the installation position is positioned between a PT neutral point and the ground, if the PT-1 is used, the PT-1 is connected with the main line for use, and if the PT-2 is used, the PT-2 is connected with the ground for use; the second step is that: different setting keys are switched on according to different capacitance values required by the state; the third step: when a setting key is turned on, the single chip controls the on-off of the relay according to the turned-on setting key and a preset program, so that the on-off of the corresponding high-voltage relay is controlled, and the purpose of setting the capacitance value of the PT intelligent blocking device is achieved.
When a setting key is switched on, the single chip microcomputer controls the on-off of the relays according to the switched-on setting key and a preset program, so that the on-off of the corresponding high-voltage relays is controlled, the single chip microcomputer controls the on-off of the five relays K1-K5 according to the preset program, and then controls the on-off of the corresponding five high-voltage relays GK 1-GK 5, so that the capacitance value of the blocking device is set, and the purpose of setting the capacitance value of the PT intelligent blocking device is achieved.
3 main bodies with the capacitance value of 0.2uF, 5 high-voltage relays, a power supply module, a setting key and an intelligent control module are integrated in the PT intelligent blocking device, the power supply module adopts a CT power taking mode, an intelligent control circuit is arranged in the intelligent control module and consists of a single chip microcomputer, a high-voltage relay control circuit, a setting circuit and the like, and the single chip microcomputer can control the working state of the high-voltage relay, so that the capacitance value of the PT intelligent blocking device is set; when the main line normally works, the PT intelligent blocking device automatically bypasses, short-circuits PT and the main line or short-circuits PT neutral point and the ground, when the main line needs to be detected by conveying direct-current voltage, the PT intelligent blocking device automatically disconnects PT (or the PT neutral point and the ground) and when the main line needs to be detected by conveying alternating-current voltage, the PT intelligent blocking device automatically bypasses, short-circuits PT and the main line or short-circuits PT neutral point and the ground.
The PT intelligent blocking method for the power line can ensure normal output of PT when a main line works normally without influencing the precision of the PT; when needing to detect the main line through carrying direct current voltage, PT intelligence blocking device automatic disconnection PT (or PT neutral point and ground) is connected, do not let direct current voltage ground, ensure that direct current instrument can normally test, when needs are detected the main line through carrying alternating current voltage, PT intelligence blocking device automatic bypass, short circuit PT and main line or short circuit PT neutral point and ground, ensure to detect normally going on, even if there is the additional signal that is used for the monitoring on the main line, the blocker can automatic recovery PT (or PT neutral point and ground) bypass, let monitoring signal normally pass through, PT intelligence blocking device can the exclusive use, also can integrate in all electric power PT on the market, become the novel PT that takes intelligence to block the function and use.
The inside singlechip that is provided with of PT intelligence blocking device according to different situations, has corresponding different setting key on the singlechip, when dialling a setting key, the singlechip sets up the capacitance value of blocking the ware according to the setting key that switches on.
Inside high voltage relay that is provided with of PT intelligence blocking device, high voltage relay's operating condition is controlled by the singlechip, can make the adjustment to high voltage relay's operating condition according to different situations to reach required capacitance value, and need not set up the blocker of different capacitance values according to different situation, it is troublesome to reduce.
3 main bodies with the capacitance value of 0.2uF, 5 high-voltage relays, a power supply module, a setting key and an intelligent control module are integrated in the PT intelligent blocking device, wherein the 5 high-voltage relays are A, B, C, D, E respectively, and when the PT intelligent blocking device is used for switching operation power supplies PT, all the high-voltage relays A-B-C-D-E are disconnected; when the blocker is used for measuring the similar PT, the high-voltage relays A-E-D are switched on, and the high-voltage relays B-C are switched off; when the blocking device is used for metering PT, the high-voltage relays A-B-C-D are switched on, and the high-voltage relays E are switched off.
When the PT intelligent blocking device is used for switching operation power supply PT, the precision value (1.5 level) of the power supply PT is 0.20uF, all high-voltage relays A-B-C-D-E are switched off, and the capacitance value of the PT intelligent blocking device is 0.20 uF; when the blocking device is used for measuring the PT-like, the precision value (0.5 level) of the PT-like is measured, the capacitance value of the blocking device connected in series is 0.30uF, the high-voltage relays A-E-D are switched on, the high-voltage relays B-C are switched off, and the capacitance value of the PT intelligent blocking device is 0.20 uF; when the blocking device is used for metering PT, the precision value (0.2 level) of the metering PT is 0.63uF, the capacitance value of the blocking device connected in series is 0.63uF, the high-voltage relays A-B-C-D are switched on, the high-voltage relays E are switched off, and the capacitance value of the PT intelligent blocking device is 0.63 uF; in conclusion, 3 types of blockers with different capacitance values do not need to be connected in series, and the capacitance of the PT intelligent blocking device can be adjusted according to different requirements, so that convenience is realized.
The working principle is as follows: when the PT intelligent blocking device is used independently, the PT intelligent blocking device is installed between the original PT and a main line or between a PT neutral point and the ground for use; when the PT intelligent blocking device is integrated into the PT to be used as a novel PT with an intelligent blocking function, the PT intelligent blocking device is divided into PT-1 and PT-2 according to the position of the PT intelligent blocking device integrated into the PT, the PT-1 is the PT intelligent blocking device integrated into the PT, the installation position is positioned between the PT and the main line, the PT-2 is the PT intelligent blocking device integrated into the PT, the installation position is positioned between the PT neutral point and the ground, if the PT-1 is connected with the main line for use, if the PT-2 is connected with the main line for use, then different setting keys are dialed according to different capacitance values required by the state, when one setting key is dialed, the single chip microcomputer controls the on-off of the relay according to a preset program and further controls the on-off of the corresponding high-voltage relay, the single chip microcomputer controls the on-off of five relays K1-K5 according to the preset program, and then the on-off of five corresponding GK 1-GK 5 high-voltage relays is controlled, so that the capacitance value of the blocking device is set, and the purpose of setting the capacitance value of the PT intelligent blocking device is achieved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. A blocker for an electrical power line, characterized by: the blocker comprises a blocker main body, wherein a capacitance element is arranged in the blocker main body, the capacitance values of the capacitance element are different according to different application scenes, so that the capacitance values of the blocker are different, the blocker is suitable for a metering PT, a measuring PT and a switch operation power supply PT, the precision value required by the metering PT is 0.2 grade, the precision value required by the measuring PT is 0.5 grade, the precision value required by the power supply PT is 1.5 grade, the capacitance value of the blocker connected in series is 0.63 uF-0.72 uF when the blocker is suitable for the measuring PT, the capacitance value of the blocker connected in series is 0.25 uF-0.50 uF when the blocker is suitable for the measuring PT, and the capacitance value of the blocker connected in series is 0.08 uF-0.25 uF when the blocker is suitable for the power supply PT;
the blocker can be used alone or integrated into the PT for use as a PT with blocking function.
2. A blocker for an electric power line according to claim 1, characterized in that: the blocking device main body is formed by rolling a solid medium and an aluminum foil electrode, a capacitance element is arranged in the blocking device main body and is divided into a capacitor and a capacitor core, the capacitor core is connected in series and in parallel by different capacitors, so that the required capacitance value is obtained, and a fuse wire is arranged on the capacitance element.
3. The utility model provides a PT intelligence blocking device for power line which characterized in that: the PT intelligent blocking device is internally integrated with a main body, a high-voltage relay, a power supply module, a setting key and an intelligent control module, wherein an intelligent control circuit is arranged in the intelligent control module and consists of a single chip microcomputer, a high-voltage relay control circuit and a setting circuit part;
the PT intelligent blocking device can be used independently or integrated into all electric PT on the market to be used as a novel PT with an intelligent blocking function, the novel PT with the intelligent blocking function is divided into PT-1 and PT-2, when the PT intelligent blocking device is used independently, the PT intelligent blocking device can be connected between an original PT and a main line or arranged between a PT neutral point and the ground when in use, when the PT smart cut-off device is integrated into a PT for use as a new type PT with a smart cut-off function, the PT intelligent blocking devices are divided into PT-1 and PT-2 according to the position of the PT intelligent blocking devices integrated into the PT, the PT-1 is the PT smart cut-off device integrated into the PT and installed between the PT and the main line, the PT-2 is integrated into the PT by the PT intelligent blocking device, and the installation position is between a PT neutral point and the ground.
4. A PT smart cut-off device for power lines as claimed in claim 3 wherein: the PT intelligent blocking device is electrically connected between a voltage transformer and a main line or between a PT neutral point and the ground, the main line comprises three phases of L1, L2 and L3, the main capacitance value of the PT intelligent blocking device is integrated in the PT intelligent blocking device and is 0.2uF, and the number of the high-voltage relays is 5.
5. A PT smart cut-off device for power lines as claimed in claim 3 wherein: the power module adopts a CT power taking mode; the input voltage of the power supply module is +12V, after DC conversion and voltage reduction in the power supply module, the output voltage is +3.3V, a circuit in the power supply module comprises a diode D1, a capacitor C2, a voltage-stabilized power supply chip N3, a capacitor C3, a capacitor C4, a voltage-stabilized power supply chip N4, a capacitor C5 and a capacitor C6, the anode of the diode D1 is electrically connected with the +12V direct current, the cathode of the diode D1 is respectively electrically connected with the first end of the capacitor C2 and the third pin of the voltage-stabilized power supply chip N3, the second end of the capacitor C2 is electrically connected with the ground, the first pin of the voltage-stabilized power supply chip N3 is electrically connected with the ground, the second pin of the voltage-stabilized power supply chip N3 is electrically connected with the fourth pin of the voltage-stabilized power supply chip N3, the first end of the capacitor C3, the first end of the capacitor C4 and the third pin of the voltage-stabilized power supply chip N4, and the second end of the capacitor C3 is electrically connected with the ground, the second end of the capacitor C4 is electrically connected with the ground, the first pin of the voltage-stabilizing power chip N4 is electrically connected with the ground, the second pin of the voltage-stabilizing power chip N4 is electrically connected with the fourth pin of the voltage-stabilizing power chip N4, the first end of the capacitor C5, the first end of the capacitor C6 and +3.3VDC, the second end of the capacitor C5 is electrically connected with the ground, and the second end of the capacitor C6 is electrically connected with the ground; the power module is connected with the filtering module, the circuit of the filtering module comprises a capacitor C8, a capacitor C9 and a capacitor C10, the first end of the capacitor C8 is electrically connected with the ground, the second end of the capacitor C8 is electrically connected with +3.3VDC, the second end of the capacitor C9 and the second end of the capacitor C10, the first end of the capacitor C9 is electrically connected with the ground, and the first end of the capacitor C10 is electrically connected with the ground.
6. A PT smart cut-off device for power lines as claimed in claim 3 wherein: the setting keys are divided into three types of 0.63uF, 0.3uF and 0.2uF, the circuit of the setting keys of 0.63uF comprises a setting switch S3 and a resistor R20, the first end of the switch S3 is electrically connected with the ground, the second end of the switch S3 is electrically connected with the first end of the resistor R20 and the thirty-fourth pin of the single chip microcomputer, the second end of the resistor R20 is electrically connected with +3.3VDC, and the setting keys of 0.3uF and 0.2uF are electrically connected in the same way as the setting keys of 0.63 uF.
7. A PT smart cut-off device for power lines as claimed in claim 3 wherein: the high-voltage relay comprises a high-voltage relay A, a high-voltage relay B, a high-voltage relay C, a high-voltage relay D and a high-voltage relay E, wherein a circuit of the high-voltage relay A comprises a resistor R35, a triode Q4, a diode D2, a relay K1 and a high-voltage relay GK1, a first end of the resistor R35 is electrically connected with a forty-first pin of the single chip microcomputer, a second end of the resistor R35 is electrically connected with a base of the triode Q4, an emitter of the triode Q4 is grounded, a collector of the triode Q4 is electrically connected with a positive electrode of a diode D2 and a first end of a relay K1, a negative electrode of the diode D2 is electrically connected with a second end of the relay K1 and a +12VDC, a third end of the relay K1 is electrically connected with the ground and a first end of the high-voltage relay GK1, a fourth end of the relay K1 is electrically connected with a second end of the high-voltage relay GK1 and a +24VDC, a third end of the high-voltage relay GK1 is electrically connected with an output end, the fourth end of the high-voltage relay GK1 is electrically connected with the input end, and the circuit connection modes of the high-voltage relay B, the high-voltage relay C, the high-voltage relay D and the high-voltage relay E are the same as those of the high-voltage relay A.
8. A PT intelligent blocking method for a power line is characterized by comprising the following steps: the PT intelligent blocking method for the power line comprises three steps, namely: when the PT intelligent blocking device is used independently, the PT intelligent blocking device is installed between the original PT and a main line or between a PT neutral point and the ground for use; when the PT intelligent blocking device is integrated into a PT to be used as a novel PT with an intelligent blocking function, the PT intelligent blocking device is divided into a PT-1 and a PT-2 according to the difference of the positions of the PT intelligent blocking device integrated into the PT, the PT-1 is the PT intelligent blocking device integrated into the PT, the installation position of the PT intelligent blocking device is located between the PT and a main line, the PT-2 is the PT intelligent blocking device integrated into the PT, the installation position of the PT intelligent blocking device is located between a PT neutral point and the ground, if the PT-1 is connected with the main line for use, and if the PT-2 is connected with the main line for use; the second step is that: different setting keys are switched on according to different capacitance values required by the state; the third step: when a setting key is turned on, the single chip controls the on-off of the relay according to the turned-on setting key and a preset program, so that the on-off of the corresponding high-voltage relay is controlled, and the purpose of setting the capacitance value of the PT intelligent blocking device is achieved.
9. The PT intelligent blocking method for the power line according to claim 8, characterized in that: when the main line normally works, the PT intelligent blocking device automatically bypasses, short-circuits PT and the main line or short-circuits PT neutral point and the ground, when the main line needs to be detected by conveying direct-current voltage, the PT intelligent blocking device automatically disconnects the PT or the PT neutral point, and when the main line needs to be detected by conveying alternating-current voltage, the PT intelligent blocking device automatically bypasses, short-circuits PT and the main line or short-circuits PT neutral point and the ground.
10. The PT intelligent blocking method for the power line according to claim 8, characterized in that: the singlechip controls the on-off of the high-voltage relays, wherein the number of the 5 high-voltage relays is A, B, C, D, E, and when the PT intelligent blocking device is used for switching operation power supply type PT, all the high-voltage relays A-B-C-D-E are switched off; when the blocker is used for measuring the similar PT, the high-voltage relays A-E-D are switched on, and the high-voltage relays B-C are switched off; when the blocking device is used for metering PT, the high-voltage relays A-B-C-D are switched on, and E is switched off.
CN202010260737.2A 2020-04-03 2020-04-03 PT intelligent blocking device and method for power line Active CN111426865B (en)

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