CN112290910B - Voltage-multiplying triangular pulse source circuit for positioning injection fault of distribution transformer low-voltage side pulse - Google Patents
Voltage-multiplying triangular pulse source circuit for positioning injection fault of distribution transformer low-voltage side pulse Download PDFInfo
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- CN112290910B CN112290910B CN202011126653.6A CN202011126653A CN112290910B CN 112290910 B CN112290910 B CN 112290910B CN 202011126653 A CN202011126653 A CN 202011126653A CN 112290910 B CN112290910 B CN 112290910B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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- 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
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Abstract
The invention relates to a voltage-multiplying triangular pulse source circuit for positioning injection faults of distribution transformer low-voltage side pulses, and belongs to the technical field of power systems. The invention uses the voltage doubling rectifying circuit to rectify the power frequency commercial power to obtain stable direct current voltage. The direct current signal is switched on and off by the MOSFET through the 555 controller, the three capacitors are respectively discharged to the integrating circuit before and after each time, and the voltage at the two ends of the R on the integrating circuit is taken to output triangular wave pulses. The triangular wave output by the invention has long rise time, and the sampling rate required when the sensor is used for recording signals is low, so that the distortion is not easy to cause. And the signal has a peak value, and the peak value can be more easily identified as a characteristic point. There are irreplaceable advantages over other implant waveforms, but existing pulse sources use fewer triangular pulses. The high-voltage pulse source circuit has a simple structure and can be applied to a low-voltage side pulse injection signal source.
Description
Technical Field
The invention relates to a voltage-multiplying triangular pulse source circuit for positioning injection faults of distribution transformer low-voltage side pulses, and belongs to the technical field of power systems.
Background
In an electric power system, a ground fault occurs in the electric power system due to the influence of the external environment and the failure of internal equipment. The class C traveling wave method proposed for eliminating the ground fault injects a pulse signal into the power system in an off-line state, and calculates the fault distance by identifying a fault point reflected wave.
However, the injected pulse signal is often a square wave pulse, with the signal edges rising rapidly. The rapid signal changes cause large impacts when encountering distribution transformers or inductive loads during propagation. Damage may be caused to devices in the power system. Meanwhile, the rise time of the square wave pulse is short, the sampling rate required when the sensor is used for recording signals is high, and the sampling rate is low, so that distortion is easily caused.
The triangular pulse has long rise time, and the sampling rate required when the sensor is used for recording signals is low, so that distortion is not easy to cause. And the signal has a peak value, and the peak value can be more easily identified as a characteristic point. Has irreplaceable advantages over square wave pulses.
Based on the voltage-multiplying triangular pulse source circuit, the voltage-multiplying triangular pulse source circuit is used for positioning the injection fault of the distribution transformer low-voltage side pulse.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a voltage-multiplying triangular pulse source circuit for positioning a pulse injection fault at a low-voltage side of a distribution transformer, and provides a pulse signal source which is safer and has lower requirements on sampling equipment for positioning the pulse injection fault.
The technical scheme of the invention is as follows: the voltage-multiplying triangular pulse source circuit for fault location of distribution transformer low-voltage side pulse injection comprises a voltage-multiplying rectifying circuit and a pulse generating module; the voltage doubling rectifying circuit is connected with the pulse generating module in parallel;
the voltage-doubling rectifying circuit comprises diodes D1, D2, D3, D4, D5, D6, capacitors C1, C2, C3, C4, C5 and C6; the first output end of the alternating current is respectively connected with the cathode of a diode D1 and the first end of C2, the anode of a diode D1 is respectively connected with the first end of C1, the cathode of D2 and the first end of C3, the second end of C1 is connected with the second output end of the alternating current and grounded, the second end of C2 is respectively connected with the anode of D2, the cathode of D3 and the first end of C4, the second end of C4 is respectively connected with the anode of D4, the cathode of D5 and the first end of C6, the second end of C3 is respectively connected with the cathode of D4 and the first end of C5, the second end of C5 is respectively connected with the anode of D5 and the cathode of D6, the first output end of the voltage doubling rectifying circuit is also connected with the pulse generating module, the second end of C6 is connected with the anode of D6, and the anode of D3 is also connected with the pulse generating rectifying circuit as the second output end of the voltage doubling rectifying circuit.
As a further aspect of the present invention, the pulse generating module includes a MOS transistor T, T1, a resistor R, an inductor L1, a freewheeling diode D7, D8, and a 555 timing module; the first output end of the voltage doubling rectifying circuit is respectively connected with the D pole of the MOS tube T and the cathode of the D7, the G pole of the MOS tube T is connected with the 555 timing module, the S pole of the MOS tube T is connected with the D pole of the MOS tube T1, the S pole of the MOS tube T1 is grounded, the G pole of the MOS tube T1 is also connected with the 555 timing module, the anode of the D7 is connected with the cathode of the D8, the anode of the D8 is grounded, one end of the resistor R is connected with the second output end of the voltage doubling rectifying circuit and also serves as the first output end of the pulse generating module, the other end of the resistor R is respectively connected with one end of the inductor L1 and also serves as the second output end of the pulse generating module, and the other end of the inductor L1 is respectively connected with the anode of the current diode D7 and the cathode of the D8.
As a further scheme of the invention, the 555 timing module comprises a 555 timer and a capacitor C of 0.01ufT2k omega range adjustable resistor RTA capacitance Cy of 0.01uf and a button SB; vcc and 2k omega range adjustable resistor R respectivelyTIs connected with pins 4 and 8 of the 555 timer, and the 2k omega range adjustable resistor RTThe other end of the resistor is respectively connected with pins 6 and 7 of a 555 timer and a capacitor C of 0.01ufTPin 5 of the 555 timer is connected with one end of a 0.01uf capacitor C1, and the other end of the 0.01uf capacitor Cy and the capacitor C are connectedTThe other end of the button SB, the other end of the button SB and the pin 1 of the 555 timer are all grounded, and the pin 3 of the 555 timer is connected with the G pole of the MOS tube IFRP 450.
As a further scheme of the invention, the timing time of the 555 timing module is T1I.e. pulse width time of the pulse signal, and RT、CTThe relationship of (c) can be expressed as: t is1＝1.1RT CT。
In a further aspect of the present invention, the voltage doubling rectifying circuit is configured to charge C1, C2, C3, C4, C5 and C6 with a power frequency 220V alternating current input thereto in positive and negative half cycles, respectively, and output a voltage of 6 times.
As a further scheme of the invention, 1860V direct current is input into the pulse generation module, and is inverted after being alternately conducted through the MOS transistor, and the obtained signal is amplified through the pulse transformer to obtain a 930V triangular pulse signal.
The invention has the beneficial effects that:
1. compared with a square wave pulse source, the triangular pulse rises and falls slowly, and the requirement on the sampling rate of sampling equipment is relatively low;
2. compared with a square wave pulse source, the triangular pulse has a peak value, the peak value can be more easily identified as a reflected wave characteristic point, and the triangular pulse has more advantages as a fault positioning signal source;
3. compared with a square wave pulse source, the triangular pulse can not cause the impact of image square wave pulse transmitted on a line, and the safety of the line is guaranteed;
4. the triangular wave output by the invention has long rise time, and the sampling rate required when the sensor is used for recording signals is low, so that the distortion is not easy to cause. And the signal has a peak value, and the peak value can be more easily identified as a characteristic point. There are irreplaceable advantages over other implant waveforms, but existing pulse sources use fewer triangular pulses. The high-voltage pulse source circuit has a simple structure and can be applied to a signal source for low-voltage side pulse injection;
5. and rectifying the power frequency commercial power by using a voltage doubling rectifying circuit to obtain stable direct current voltage. The direct current signal is switched on and off by the MOSFET through the 555 controller, the three capacitors are respectively discharged to the integrating circuit before and after each time, and the voltage at the two ends of the R on the integrating circuit is taken to output triangular wave pulses.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a 555 timing module structure.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1: as shown in fig. 1-2, the voltage-multiplying triangular pulse source circuit for positioning the injection fault of the distribution transformer low-voltage side pulse comprises a voltage-multiplying rectifying circuit and a pulse generating module; the voltage doubling rectifying circuit is connected with the pulse generating module in parallel;
the voltage-doubling rectifying circuit comprises diodes D1, D2, D3, D4, D5, D6, capacitors C1, C2, C3, C4, C5 and C6; the first output end of the alternating current is respectively connected with the cathode of a diode D1 and the first end of C2, the anode of a diode D1 is respectively connected with the first end of C1, the cathode of D2 and the first end of C3, the second end of C1 is connected with the second output end of the alternating current and grounded, the second end of C2 is respectively connected with the anode of D2, the cathode of D3 and the first end of C4, the second end of C4 is respectively connected with the anode of D4, the cathode of D5 and the first end of C6, the second end of C3 is respectively connected with the cathode of D4 and the first end of C5, the second end of C5 is respectively connected with the anode of D5 and the cathode of D6, the first output end of the voltage doubling rectifying circuit is also connected with the pulse generating module, the second end of C6 is connected with the anode of D6, and the anode of D3 is also connected with the pulse generating rectifying circuit as the second output end of the voltage doubling rectifying circuit.
As a further aspect of the present invention, the pulse generating module includes a MOS transistor T, T1, a resistor R, an inductor L1, a freewheeling diode D7, D8, and a 555 timing module; the first output end of the voltage doubling rectifying circuit is respectively connected with the D pole of the MOS tube T and the cathode of the D7, the G pole of the MOS tube T is connected with the 555 timing module, the S pole of the MOS tube T is connected with the D pole of the MOS tube T1, the S pole of the MOS tube T1 is grounded, the G pole of the MOS tube T1 is also connected with the 555 timing module, the anode of the D7 is connected with the cathode of the D8, the anode of the D8 is grounded, one end of the resistor R is connected with the second output end of the voltage doubling rectifying circuit and also serves as the first output end of the pulse generating module, the other end of the resistor R is respectively connected with one end of the inductor L1 and also serves as the second output end of the pulse generating module, and the other end of the inductor L1 is respectively connected with the anode of the current diode D7 and the cathode of the D8.
As a further scheme of the invention, the 555 timing module comprises a 555 timer and a capacitor C of 0.01ufT2k omega range adjustable resistor RTA capacitance Cy of 0.01uf and a button SB; vcc and 2k omega range adjustable resistor R respectivelyTIs connected with pins 4 and 8 of the 555 timer, and the 2k omega range adjustable resistor RTThe other end of the resistor is respectively connected with pins 6 and 7 of a 555 timer and a capacitor C of 0.01ufTPin 5 of the 555 timer is connected with one end of a 0.01uf capacitor C1, and the other end of the 0.01uf capacitor Cy and the capacitor C are connectedTThe other end of the button SB, the other end of the 555 timerPin 1 is grounded, and pin 3 of the 555 timer is connected with the G pole of the MOS transistor IFRP 450.
As a further scheme of the invention, the timing time of the 555 timing module is T1I.e. pulse width time of the pulse signal, and RT、CTThe relationship of (c) can be expressed as: t is1＝1.1RT CT。
As a further embodiment of the present invention, as shown in fig. 1, the voltage-doubling rectifying circuit is configured to charge C1, C2, C3, C4, C5, and C6 with a power frequency of 220V alternating current in positive and negative half cycles, respectively, and output a voltage of 6 times (1860V).
As a further scheme of the invention, 1860V direct current is input into the pulse generation module, and is inverted after being alternately conducted through the MOS transistor, and the obtained signal is amplified through the pulse transformer to obtain a 930V triangular pulse signal.
And inversion is realized by controlling the on-off of the MOS tube. The on-off of the MOS tube is realized by a 555 timer, a button is pressed down to give a negative pulse to the 555 timer, the MOS tube enters a monostable state, and V is output0Outputting a pulse width Ts(11us) pulse to control the conduction of the MOS and the conduction time is also TS. At turn-on of T, capacitors C4, C5, C6, which have stabilized voltages at 3U (930V), discharge through R, L1, the voltage at R being a straight line with slope k since R, L1 constitutes an integrating circuit. When T1 was turned on, capacitors C1, C2, C3, which stabilized in voltage at-3U, discharged through R, L1, and the voltage at R was a straight line with slope-k since R, L1 made up the integrating circuit. The MOS T, T1 is turned on once before and after, the output signal at R is a triangular pulse with a size of 3U (930V), and the triangular pulse with a pulse width of 2TS (22us) and an amplitude of 3U is output after being amplified by a pulse transformer.
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.
Claims (4)
1. A voltage doubling triangle pulse source circuit for joining in marriage and become low pressure side pulse injection fault location, its characterized in that: the pulse generator comprises a voltage doubling rectifying circuit and a pulse generating module; the voltage doubling rectifying circuit is connected with the pulse generating module in parallel;
the voltage-doubling rectifying circuit comprises diodes D1, D2, D3, D4, D5, D6, capacitors C1, C2, C3, C4, C5 and C6; a first output end of the alternating current is respectively connected with a cathode of a diode D1 and a first end of C2, an anode of a diode D1 is respectively connected with a first end of C1, a cathode of D2 and a first end of C3, a second end of C1 is connected with a second output end of the alternating current and grounded, a second end of C2 is respectively connected with an anode of D2, a cathode of D3 and a first end of C4, a second end of C4 is respectively connected with an anode of D4, a cathode of D5 and a first end of C6, a second end of C3 is respectively connected with a cathode of D4 and a first end of C5, a second end of C5 is respectively connected with an anode of D5 and a cathode of D6 and is also connected with the pulse generation module as a first output end of the voltage doubling rectification circuit, a second end of C6 is connected with an anode of D6, and a cathode of D3 is also connected with the pulse generation rectification circuit as a second output end of the voltage doubling rectification circuit;
1860V direct current is input into the pulse generation module, inversion is carried out after the alternating conduction of the MOS tubes, and the obtained signal is amplified by a pulse transformer to obtain a 930V triangular pulse signal;
the pulse generation module comprises an MOS (metal oxide semiconductor) tube T, T1, a resistor R, an inductor L1 and freewheeling diodes D7, D8 and 555 timing modules; the first output end of the voltage doubling rectifying circuit is respectively connected with the D pole of the MOS tube T and the cathode of the D7, the G pole of the MOS tube T is connected with the 555 timing module, the S pole of the MOS tube T is connected with the D pole of the MOS tube T1, the S pole of the MOS tube T1 is grounded, the G pole of the MOS tube T1 is also connected with the 555 timing module, the anode of the D7 is connected with the cathode of the D8, the anode of the D8 is grounded, one end of the resistor R is connected with the second output end of the voltage doubling rectifying circuit and also serves as the first output end of the pulse generating module, the other end of the resistor R is respectively connected with one end of the inductor L1 and also serves as the second output end of the pulse generating module, and the other end of the inductor L1 is respectively connected with the anode of the current diode D7 and the cathode of the D8.
2. The voltage-multiplying triangular pulse source circuit for distributing low-side pulse injection fault location of claim 1, wherein: the 555 timing module comprises a 555 timer and a 0.01uf capacitor CT2k omega range adjustable resistor RTA capacitance Cy of 0.01uf and a button SB; vcc and 2k omega range adjustable resistor R respectivelyTIs connected with pins 4 and 8 of the 555 timer, and the 2k omega range adjustable resistor RTThe other end of the resistor is respectively connected with pins 6 and 7 of a 555 timer and a capacitor C of 0.01ufTPin 5 of the 555 timer is connected with one end of a 0.01uf capacitor C1, and the other end of the 0.01uf capacitor Cy and the capacitor C are connectedTThe other end of the button SB, the other end of the button SB and the pin 1 of the 555 timer are all grounded, and the pin 3 of the 555 timer is connected with the G pole of the MOS tube IFRP 450.
3. The voltage-multiplying triangular pulse source circuit for distributing low-side pulse injection fault location of claim 2, wherein: the timing time of the 555 timing module is T1I.e. pulse width time of the pulse signal, and RT、CTIn relation to (2)Can be expressed as: t is1＝1.1RT CT。
4. The voltage-multiplying triangular pulse source circuit for distributing low-side pulse injection fault location of claim 1, wherein: the voltage doubling rectifying circuit is used for charging C1, C2, C3, C4, C5 and C6 with positive and negative half cycles of input power frequency 220V alternating current and outputting 6-time voltage.
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| CN202011126653.6A CN112290910B (en) | 2020-10-20 | 2020-10-20 | Voltage-multiplying triangular pulse source circuit for positioning injection fault of distribution transformer low-voltage side pulse |
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