CN106526476B - Synchronous control device and method for power frequency follow current interruption capability test synthesis loop - Google Patents
Synchronous control device and method for power frequency follow current interruption capability test synthesis loop Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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Abstract
The invention provides a synchronous control device and method for a power frequency follow current interruption capability test synthetic loop. The device comprises a power frequency oscillation loop, a power frequency oscillation starting detection unit, a trigger phase control unit, a photoelectric conversion unit and an ignition unit which are connected in sequence. The invention can avoid the time delay problem caused by detecting the current signal of the closing contact or the loop, and improves the time control accuracy; the electromagnetic coupling interference of the loop of the self is reduced, the space electromagnetic coupling interference and the conduction interference invasion of a power supply circuit are effectively avoided, and the safe and reliable operation of the circuit is ensured; the system effectively avoids false triggering accidents caused by large-current electromagnetic interference and strong electromagnetic pulse space coupling at the moment of power frequency starting and impact ignition of the system, and improves the operation reliability and safety of the system.
Description
Technical Field
The invention relates to the technical field of lightning protection of power systems, in particular to a synchronous control device and method for a synthetic loop of a power frequency follow current interruption capability test.
Background
Aiming at the long-term research of the industrial frequency follow current interruption capability test of the power line arrester in developed countries, a large-scale test device for testing the industrial frequency follow current interruption capability of the line arrester has been developed at present, the device integrates lightning impulse and industrial frequency power supply, truly simulates the actual working condition of the line arrester suffering from lightning stroke in the net hanging operation, but the synchronous control method is realized by controlling the switching-on and switching-off of a breaker through a singlechip or a PLC control system, and the cost and the occupied space of equipment are huge. Meanwhile, the inherent closing time and opening time of the circuit breaker, the ignition time of the ignition device and the like are required to be respectively tested, accurate control execution is required to be carried out according to a certain time sequence, so that the success of the test can be ensured, and the failure rate of the test is relatively high. Meanwhile, because synchronous control is needed to be carried out on a power frequency high-voltage heavy-current power supply and hundreds of kilovolts of lightning impulse voltage in a synthetic loop test, how to avoid electromagnetic pulse interference which is subjected to a power frequency heavy-current magnetic field, high in amplitude and quick in rising speed when in electromagnetic compatibility design is a key technology, and the synchronous control circuit is frequently triggered by mistake due to the electromagnetic interference, so that test failure is caused, and even serious equipment faults and personal injuries are caused.
Patent CN101025433a discloses a synchronous control system for a synthetic test of a high-voltage circuit breaker, which comprises the steps of collecting short-circuit current, predicting a current curve after a/D conversion, and predicting the zero crossing point moment of the short-circuit current, so as to send out synchronous control pulse before the zero crossing point, and enabling an ignition ball gap to break down at a preset moment. Because the short-circuit current of the loop cannot be suddenly changed, the rising edge time is in the ms level, and the synchronous control time precision by collecting the short-circuit current is not accurate enough. The system controls the low-voltage electronic circuit to collect data and calculate and send out synchronous control instructions through the singlechip or the PLC control system, and has the defects of difficult electromagnetic compatibility design, complex function realization and the like. Under the action of high-voltage impact, the electronic control circuit and the microcomputer control system are easy to be disturbed and fail.
The domestic manufacturer designs a follow current cut-off test loop for the out-of-band series gap line arrester, which can effectively perform line arrester action load test, the lightning impulse voltage action time is randomly generated, the design of power frequency voltage triggering and impulse voltage synchronous control is not performed, and the test of the power frequency follow current cut-off capability of the lightning protection device under the condition that each phase of the power frequency network voltage is broken down by lightning strike cannot be simulated.
Patent CN 104267277B discloses an overvoltage protection performance testing device, a control method and a system of the overvoltage protection device, and the synchronous control method is to trigger a power electronic power device by collecting lightning impulse voltage signals, realize the quick input of a power frequency oscillation loop, and perform a power frequency follow current interruption capability testing test by the simultaneous occurrence of the power frequency oscillation loop and the impulse voltage loop. The method can only simulate the working condition that the overvoltage protection device suffers lightning flashover when the power frequency voltage is in peak value, but cannot simulate the working condition that the overvoltage protection device suffers lightning at each phase of the whole period of the power frequency voltage.
Patent CN 104237751B discloses a testing device for the power frequency freewheel interruption capability of a lightning protection device, and the synchronous control principle is to control the discharge time of a power frequency oscillating circuit and impact discharge by adjusting the ball gap distances of different circuits. However, since the discharge time is controlled by using the difference of the discharge distances, the control is easily affected by factors such as air humidity, atmospheric pressure, electrode shape, etc., and the control accuracy of the synchronous time is not enough due to a certain dispersion of the air gap discharge.
Disclosure of Invention
The invention provides a synchronous control device and a synchronous control method for a synthetic loop of a power frequency follow current interruption capability test, which can avoid the time delay problem caused by detecting a closing contact or a loop current signal and improve the time control accuracy; the electromagnetic coupling interference of the loop of the self is reduced, the space electromagnetic coupling interference and the conduction interference invasion of a power supply circuit are effectively avoided, and the safe and reliable operation of the circuit is ensured; the system effectively avoids false triggering accidents caused by large-current electromagnetic interference and strong electromagnetic pulse space coupling at the moment of power frequency starting and impact ignition of the system, and improves the operation reliability and safety of the system.
The synchronous control device for the power frequency follow current interruption capability test synthesis loop comprises a power frequency oscillation loop, and a power frequency oscillation starting detection unit, a trigger phase control unit, a photoelectric conversion and ignition unit which are sequentially connected, wherein the power frequency oscillation loop comprises a power frequency oscillation starting breaker K1, a power frequency oscillation capacitor C and a power frequency oscillation inductance L which are connected in series;
the power frequency oscillation starting detection unit is connected with the output end of the power frequency oscillation loop and is used for converting the detected first voltage abrupt change rising edge on the power frequency oscillation inductance L into a logic level signal required by the control circuit, converting the logic level signal into an optical signal and transmitting the optical signal to the trigger phase control unit through an optical fiber;
the trigger phase control unit is used for converting the optical signal output by the power frequency oscillation starting detection unit into a logic high level signal, latching and maintaining the high level, taking the rising edge of the logic high level as a reference, outputting a pulse electric signal with a fixed pulse width after a preset delay time, converting the pulse electric signal into an optical signal with the same pulse width time, and transmitting the optical signal to the photoelectric conversion and ignition unit through an optical fiber;
the photoelectric conversion and ignition unit is used for converting the optical signal output by the trigger phase control unit into a pulse electric signal with the width equal to the duration of the optical signal, the pulse electric signal is used as a driving signal to drive the amplifying isolation circuit to generate high-voltage pulse, the high-voltage pulse acts on the impulse voltage ignition ball gap, the impulse voltage loop is started, and the output impulse voltage is applied to two ends of the sample.
Further, the power frequency oscillation starting detection unit comprises a power frequency oscillation trigger circuit and an electric optical signal conversion circuit, the power frequency oscillation trigger circuit comprises a resistor voltage divider and an optical coupler OP1, the resistor voltage divider is connected in parallel with two ends of the power frequency oscillation inductance L, the resistor voltage divider divides the upper voltage of the power frequency oscillation inductance L into low-voltage signals according to a proportion and then drives the optical coupler OP1 to output trigger signals, and the trigger signals drive the electric optical signal conversion circuit to send out optical signals.
Further, the resistor divider is formed by sequentially connecting resistors R1, R2, R3 and R4 in series, wherein one end of the resistor R4 is grounded as a low-voltage end, and the other end of the resistor R3 is connected as a high-voltage end.
Further, the power frequency oscillation triggering circuit 11 further includes a transient suppression diode D1 connected in parallel with the resistor R4, wherein a cathode of the transient suppression diode D1 is connected to a high voltage end of the resistor divider, an anode of the transient suppression diode D1 is connected to a low voltage end, a cathode of the transient suppression diode D1 is connected to an anode of a light emitting diode of the optocoupler OP1, and an anode of the transient suppression diode D1 is connected to a cathode of the light emitting diode of the optocoupler OP1, so as to prevent the primary side of the optocoupler OP1 from being broken down by reverse voltage.
Further, the electric-optical signal conversion circuit comprises resistors R5, R6 and R7, a direct current power supply, a power driver U2 and a light emitting diode U1, wherein the power driver U2 comprises a NAND gate and a triode, the output emitter of the optical coupler OP1 is connected with the ground of the power supply, the collector is pulled up through the resistor R5 and then used as one input of the NAND gate in the power driver U2, when the power frequency oscillation starts, the input is changed into a low level, the other input of the NAND gate is connected with the direct current power supply, the direct current power supply is connected to the anode of the light emitting diode U1 through the resistor R7, and the direct current power supply is connected to the cathode of the light emitting diode U1 through the resistor R6; the collector of the triode 122 in U2 is connected to the common node of the resistor R6 and the cathode of the light emitting diode U1, the emitter is connected to the power ground, when one input of U2 is at a low level, the built-in triode is driven to be conducted, and the light emitting diode U1 emits a light signal.
Further, the trigger phase control unit comprises a photoelectric signal conversion circuit, a latch and delay control circuit and an electric light signal conversion circuit which are connected in series,
the photoelectric signal conversion circuit comprises an optical signal receiving head U3, resistors R8, R9, R10 and R11 and a triode Q1, wherein a collector electrode of the optical signal receiving head U3 is pulled up to a +5V power supply through the resistor R8, when receiving an optical signal transmitted by the power frequency oscillation starting detection unit 10, the U3 outputs a low-level signal to a base electrode of the triode Q1 through the resistor R9, the triode Q1 is cut off, and a collector electrode of the triode Q1 jumps to a high level and is transmitted to the latch and delay control circuit through the resistor R11;
the latch and delay control circuit comprises a high-level latch circuit and a delay control circuit, wherein the high-level latch circuit latches a high-level signal transmitted by the resistor R11, the delay control circuit receives the latched high-level signal, and a pulse level signal with a fixed width is output by taking a high-level rising edge as a reference and passing through a preset delay time;
the electric-optical signal conversion circuit is used for outputting optical signals with the duration equal to the time width of the pulse level signals according to the pulse level signals with the fixed width output by the latch and delay control circuit.
Further, the electric-optical signal conversion circuit comprises resistors R13, R14, R7, a direct current power supply, a power driver U4 and a light emitting diode U5, wherein a pulse level signal output by the optical latch and delay control circuit is transmitted to one input end of a nand gate of the power driver U4, the other input end of the nand gate is connected with the direct current power supply and is always a high level signal, and the direct current power supply is connected to the anode of the light emitting diode U5 through the resistor R14 and is connected to the cathode of the light emitting diode U5 through the resistor R13; the collector of the triode in U4 is connected to the common node of the resistor R13 and the cathode of the light emitting diode U5, and the emitter is connected to the power ground.
Further, the photoelectric conversion and ignition unit includes a photoelectric signal conversion circuit and an ignition unit, the photoelectric signal conversion circuit includes an optical signal receiving head U6, a resistor R15, a resistor R16, a resistor R17, a capacitor C3, and a triode Q2, after the optical signal receiving head U6 receives an optical signal sent by the trigger phase control unit 20, a collector jumps to a low level, the low level signal is connected to a base of the triode Q2 through the resistor R16, the triode Q2 is driven to be turned off, a collector of the Q2 jumps to a high level, the ignition unit includes resistors R18, R19, R20, an energy storage capacitor C4, a MOS transistor Q3, a pulse transformer T1, and an impulse voltage ignition ball gap, the high level signal on the collector of the triode Q2 drives the MOS transistor Q3 to be turned on through the resistor R18, the on time is equal to the duration of the received high level signal, the energy storage capacitor C4 is sequentially connected to the primary winding of the pulse transformer T1, the drain of the MOS transistor Q3, the source of the MOS transistor Q3, and the current limiting resistor R19 are connected to the ground, and the secondary pulse transformer T1 pulse high voltage is connected to the impulse voltage pin through the resistor R20.
A synchronous control method for a power frequency follow current interruption capability test synthesis loop is carried out by using the device, and comprises the following steps:
step one, closing a power frequency oscillation starting circuit breaker K1, and starting a power frequency oscillation loop;
step two, the power frequency oscillation starting detection unit converts the rising edge of the first voltage mutation detected on the power frequency oscillation inductance L into a logic level signal required by a control circuit, converts the logic level signal into an optical signal and transmits the optical signal to the trigger phase control unit through an optical fiber;
step three, the triggering phase control unit converts the optical signal output by the power frequency oscillation starting detection unit into a logic high level signal, latches and maintains the high level, and the triggering phase control unit outputs a pulse electric signal with a fixed pulse width after a preset delay time by taking the rising edge of the logic high level as a reference, converts the pulse electric signal into an optical signal with the same pulse width time, and transmits the optical signal to the photoelectric conversion and ignition unit through an optical fiber;
and fourthly, the photoelectric conversion and ignition unit converts the optical signal output by the trigger phase control unit into a pulse electric signal with the width equal to the duration of the optical signal, the pulse electric signal is used as a driving signal to drive the amplifying isolation circuit to generate high-voltage pulse, the high-voltage pulse acts on the impulse voltage ignition ball gap, the impulse voltage loop is started to output impulse voltage to be applied to two ends of a test article, and one test operation is finished.
Further, the power supply of the frequency oscillation starting detection unit is a button battery, and the signal transmission time delay is within 100 ns; triggering the phase control unit circuit to transfer the signal with delay within 200 ns; the signal transmission delay of the photoelectric conversion and ignition unit circuit is within 100 ns.
The invention has the following advantages:
1. the voltage signal of the oscillating inductor in the power frequency oscillating circuit is captured by the resistor voltage divider as the starting condition of the power frequency oscillating voltage, the characteristic that the voltage drop of the oscillating inductor suddenly changes after the power frequency oscillating circuit breaker is started to switch on in the power frequency oscillating circuit is utilized, the time delay problem caused by detecting the switch-on contact or the circuit current signal is avoided, and the time control accuracy is improved.
2. The power frequency oscillation starting detection unit and the ignition device in the power frequency follow current interruption capability test synthesis loop are closely adjacent to the power device in the synthesis loop, and the strong power frequency electromagnetic interference and the high-strength electromagnetic pulse interference which are suffered in the synthesis loop test starting are most serious. The invention can greatly reduce the unit volume and the equivalent plane area by taking the self-contained battery pack as a control power supply, does not need to be externally connected with a power supply circuit, greatly reduces the electromagnetic coupling interference of a loop of the self-contained battery pack, effectively avoids the space electromagnetic coupling interference and the conduction interference invasion of the power supply circuit, and ensures the safe and reliable operation of the circuit.
3. The optical fiber transmission technology among the detection unit, the time sequence control unit and the execution ignition unit in the synthesis loop replaces a cable transmission control circuit, so that false triggering accidents caused by large-current electromagnetic interference and strong electromagnetic pulse space coupling at the moment of power frequency starting and impact ignition of the system are effectively avoided, and the operation reliability and safety of the system are improved.
4. The synchronous control method is realized by completely depending on hardware circuit design, the time delay of photoelectric conversion and level conversion is in ns level, the time delay of a complete signal flow can be controlled within 500ns, and the full-phase control precision of the power frequency oscillation voltage in the power frequency follow current interruption capability test is ensured.
Drawings
FIG. 1 is a schematic diagram of a synchronous control device of a synthetic loop for power frequency follow current interruption capability test, which is used for carrying out the power frequency follow current interruption capability test;
FIG. 2 is a schematic block diagram of a circuit of a synchronous control device of a synthetic loop for a power frequency follow current interruption capability test of the invention;
FIG. 3 is a schematic circuit diagram of a power frequency oscillation start detection unit in the invention;
FIG. 4 is a schematic circuit diagram of a trigger phase control unit of the present invention;
FIG. 5 is a schematic circuit diagram of a photoelectric conversion and ignition unit according to the present invention;
FIG. 6 is a graph of test results of a synchronous control method of a synthetic loop for a power frequency freewheel blocking capability test of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 1, one embodiment of the synchronous control device for a power frequency follow current interruption capability test synthesis loop of the present invention includes a power frequency oscillation loop, a power frequency oscillation start detection unit 10, a trigger phase control unit 20, and a photoelectric conversion and ignition unit 30, which are sequentially connected, where the power frequency oscillation loop includes a power frequency oscillation start circuit breaker K1, a power frequency oscillation capacitor C, and a power frequency oscillation inductance L, which are connected in series.
The test piece 40 is subjected to a power frequency follow current interruption capability test by using the invention, the power frequency oscillation starting circuit breaker K1 is closed first, and the power frequency oscillation loop starts to start.
The power frequency oscillation starting detection unit 10 is connected with the output end of the power frequency oscillation loop, and is used for converting the detected first voltage abrupt rising edge on the power frequency oscillation inductance L into a logic level signal required by the control circuit, converting the logic level signal into an optical signal, and transmitting the optical signal to the trigger phase control unit 20 through an optical fiber;
the trigger phase control unit 20 is configured to convert the optical signal output by the power frequency oscillation start detection unit 10 into a logic high level signal, latch and hold the logic high level, and the trigger phase control unit 20 outputs a pulse electrical signal with a fixed pulse width after a preset delay time based on a logic high level rising edge, converts the pulse electrical signal into an optical signal with the same pulse width time, and transmits the optical signal to the photoelectric conversion and ignition unit 30 through an optical fiber;
the photoelectric conversion and ignition unit 30 is configured to convert the optical signal output by the trigger phase control unit 20 into a pulse electrical signal with a width equal to the duration of the optical signal, and drive the amplifying isolation circuit to generate a high voltage pulse by using the pulse electrical signal as a driving signal, where the high voltage pulse acts on the surge voltage ignition ball gap 50, and start the surge voltage loop, and end the primary test operation.
Referring to fig. 2, the power frequency oscillation start detection unit 10 includes a power frequency oscillation trigger circuit 11 and an electric light signal conversion circuit 12 connected in series, the trigger phase control unit 20 includes a photoelectric signal conversion circuit 21, a latch and delay control circuit 22, and an electric light signal conversion circuit 23 connected in series, and the photoelectric conversion and ignition unit 30 includes a photoelectric signal conversion circuit 31 and an ignition unit 32 connected in series.
Fig. 3 shows a schematic circuit diagram of a power frequency oscillation starting detection unit 10, where the power frequency oscillation starting detection unit 10 includes a power frequency oscillation triggering circuit 11 and an electric-optical signal conversion circuit 12, the power frequency oscillation triggering circuit 11 includes a resistor voltage divider, a transient suppression diode D1, and an optocoupler OP1, the resistors R1, R2, R3, and R4 are sequentially connected in series to form the resistor voltage divider, and are connected in parallel to two ends of a power frequency oscillation inductance L in the power frequency oscillation circuit, one end of the resistor R4 is grounded and used as a low voltage end, the other end of the resistor R4 is connected with the resistor R3 and used as a high voltage end (i.e., an output end of the resistor voltage divider), the resistor R4 divides an upper voltage of the power frequency oscillation inductance L into a low voltage signal in proportion, and the optocoupler OP1 outputs a triggering signal. The transient suppression diode D1 is connected with the resistor R4 in parallel, the cathode of the diode D1 is connected with the high-voltage end, and the anode is connected with the low-voltage end. The cathode of the D1 is connected to the LED anode of the optical coupler OP1, and the D1 anode is connected to the LED cathode of the OP1 to prevent the primary side of the optical coupler OP1 from reverse voltage breakdown.
The electric-optical signal conversion circuit 12 includes resistors R5, R6, R7, a dc power supply (for example, a +5v power supply), a power driver U2, and a light emitting diode U1, where an output emitter of the optocoupler OP1 is connected to a power supply ground, and a collector is pulled up by the resistor R5 and is used as an input of the nand gate 121 in the power driver U2, and when the power frequency oscillation starts, the input (a trigger signal output by the optocoupler OP 1) becomes a low level. The other input of the NAND gate 121 is connected to a +5V power supply and is always a high level signal. The +5V power supply is connected to the anode of the light-emitting diode U1 through a resistor R7 and connected to the cathode of the light-emitting diode U1 through a resistor R6; the collector of transistor 122 in U2 is connected to the common node of resistor R6 and the cathode of LED U1, and the emitter is connected to power ground. When one of the inputs of U2 is low, the built-in transistor 122 is driven to be turned on, and the light emitting diode U1 emits a light signal.
The power supply of the power frequency oscillation starting detection unit 10 is a button cell assembly, and the signal transmission time delay is within 100 ns.
Fig. 4 shows a schematic circuit diagram of the trigger phase control unit 20, where the trigger phase control unit 20 includes a photoelectric signal conversion circuit 21, a latch and delay control circuit 22, and an electric light signal conversion circuit 23 connected in series.
The photoelectric signal conversion circuit 21 includes an optical signal receiving head U3, resistors R8, R9, R10, R11, and a triode Q1, where a collector of the optical signal receiving head U3 is pulled up to +5v power supply via the resistor R8, when receiving an optical signal transmitted from the power frequency oscillation starting detection unit 10, the U3 outputs a low level signal to a base of the triode Q1 via the resistor R9, the triode Q1 is turned off, a collector of the triode Q1 jumps to a high level, and is transmitted to the latch and delay control circuit 22 via the resistor R11, and a capacitor C1 is connected between the collector of the U3 and the ground of the power supply in parallel for filtering out the high frequency interference signal.
The latch and delay control circuit 22 includes a high level latch circuit and a delay control circuit, the high level latch circuit latches the high level signal transmitted by the resistor R11, the delay control circuit receives the latched high level signal, and outputs a pulse level signal with a fixed width by a preset delay time with the high level rising edge as a reference.
The electric-optical signal conversion circuit 23 has a circuit structure similar to that of the electric-optical signal conversion circuit 12 in the power frequency oscillation starting detection unit 10, and includes resistors R13, R14, R7, a direct current power supply (for example, a +5v power supply), a power driver U4, and a light emitting diode U5.
The pulse level signal output by the optical latch and delay control circuit 22 is transmitted to one input end of the nand gate of the power driver U4, and the other input end of the nand gate is connected to the +5v power supply and is always a high level signal. The +5V power supply is connected to the anode of the light-emitting diode U5 through a resistor R14 and connected to the cathode of the light-emitting diode U5 through a resistor R13; the collector of the triode in U4 is connected to the common node of the resistor R13 and the cathode of the light emitting diode U5, and the emitter is connected to the power ground.
The pulse level signal passes through a NAND gate of the power driver U4 to drive a built-in triode, and the conducting time of the triode is equal to the time width of the pulse level signal. Under the combined action of the current limiting resistor R14 and the triode in the power driver U4, the light emitting diode U5 emits light, and the duration of the light emitting diode U5 is equal to the time width of the pulse level signal. The trigger phase control unit 20 circuit signal transmission delay is within 200 ns.
Fig. 5 shows a schematic circuit diagram of the photoelectric conversion and ignition unit 30, and the photoelectric conversion and ignition unit 30 includes a photoelectric signal conversion circuit 31 and an ignition unit 32.
The photoelectric signal conversion circuit 31 includes an optical signal receiving head U6, a resistor R15, a resistor R16, a resistor R17, a capacitor C3, and a triode Q2, where after the optical signal receiving head U6 receives the optical signal sent by the trigger phase control unit 20, the collector jumps to a low level, the low level signal is connected to the base of the triode Q2 through the resistor R16, the triode Q2 is driven to cut off, and the collector of the Q2 jumps to a high level.
The ignition unit 32 comprises resistors R18, R19 and R20, an energy storage capacitor C4, a MOS tube Q3, a pulse transformer T1 and an impulse voltage ignition ball gap 50. The high-level signal of the Q2 collector is used for driving the MOS transistor Q3 to be turned on through the resistor R18, and the on time is equal to the duration of the received high-level signal. The energy storage capacitor C4 is connected with the primary winding of the pulse transformer T1, the drain electrode of the MOS tube Q3, the source electrode of the MOS tube Q3 and the current limiting resistor R19 in series to the power ground. When the MOS tube Q3 is turned on, the charge stored by the energy storage capacitor C4 is discharged to the power ground through the primary winding of the pulse transformer T1, the drain electrode and the source electrode of the Q3 and the current limiting resistor R19, and a high-voltage pulse is induced in the secondary winding of the pulse transformer T1. The pulse transformer T1 secondary winding high voltage pulse is connected to the discharge pin of the surge voltage ignition bulb 50 through resistor R20, generating a tip discharge spark, the ignition bulb air is ionized, starting the surge voltage loop, and the output surge voltage is applied to both ends of the test piece 40 (as shown in fig. 1). The photoelectric conversion and ignition unit 30 circuit signal transmission delay is within 100 ns.
The synchronous control method for the power frequency follow current interruption capability test synthetic loop, which is designed by the invention, captures the oscillating inductance voltage signal in the power frequency oscillating loop through the resistor voltage divider as the starting condition of the power frequency oscillating voltage, utilizes the characteristic that the oscillating inductance voltage drop suddenly changes after the power frequency oscillating in the power frequency oscillating loop starts to switch on a breaker, avoids the time delay problem caused by detecting a switching-on contact or loop current signal, and improves the time control accuracy. The self-contained battery pack is used as a control power supply, so that the unit volume and the equivalent plane area can be reduced, an external power supply is not needed, the loop electromagnetic coupling interference of the self-contained battery pack is greatly reduced, the space electromagnetic coupling interference and the conduction interference invasion of a power supply circuit are effectively avoided, and the safe and reliable operation of the circuit is ensured. The optical fiber transmission technology between the units replaces a cable transmission control circuit, and false triggering accidents caused by large current electromagnetic interference and strong electromagnetic pulse space coupling at the moment of power frequency starting and impact ignition of the system are effectively avoided. The synchronous control method is realized by completely depending on hardware circuit design, the time delay of photoelectric conversion and level conversion is in ns level, the time delay of a complete signal flow can be controlled within 500ns, and the full-phase control precision of the power frequency oscillation voltage in the power frequency follow current interruption capability test is ensured. Fig. 6 is a graph showing the result of a line lightning protection device power frequency freewheel interruption capability test using the control method of the present invention.
The foregoing is merely illustrative embodiments of the present invention, and the present invention is not limited thereto, and any changes or substitutions that may be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. The synchronous control method of the power frequency follow current interruption capability test synthesis loop is characterized by adopting a synchronous control device of the power frequency follow current interruption capability test synthesis loop, wherein the synchronous control device of the power frequency follow current interruption capability test synthesis loop comprises a power frequency oscillation loop, the power frequency oscillation loop comprises a power frequency oscillation starting circuit breaker K1, a power frequency oscillation capacitor C and a power frequency oscillation inductance L which are connected in series, and also comprises a power frequency oscillation starting detection unit (10), a trigger phase control unit (20) and a photoelectric conversion and ignition unit (30) which are connected in sequence,
the power frequency oscillation starting detection unit (10) is connected with the output end of the power frequency oscillation loop, and is used for converting the detected first voltage abrupt rising edge on the power frequency oscillation inductance L into a logic level signal required by the control circuit, converting the logic level signal into an optical signal and transmitting the optical signal to the trigger phase control unit (20) through an optical fiber;
the trigger phase control unit (20) is used for converting the optical signal output by the power frequency oscillation starting detection unit (10) into a logic high level signal, latching and keeping the logic high level, and the trigger phase control unit (20) takes the logic high level rising edge as a reference, outputs a pulse electric signal with a fixed pulse width after a preset delay time, converts the pulse electric signal into an optical signal with the same pulse width time, and transmits the optical signal to the photoelectric conversion and ignition unit (30) through an optical fiber;
the photoelectric conversion and ignition unit (30) is used for converting the optical signal output by the trigger phase control unit (20) into a pulse electric signal with the width equal to the duration of the optical signal, and driving the amplifying isolation circuit to generate high-voltage pulse by using the pulse electric signal as a driving signal, wherein the high-voltage pulse acts on the impulse voltage ignition ball gap (50), a impulse voltage loop is started, and the output impulse voltage is applied to two ends of the sample (40);
the method comprises the following steps:
step one, closing a power frequency oscillation starting circuit breaker K1, and starting a power frequency oscillation loop;
step two, the power frequency oscillation starting detection unit (10) converts the detected first voltage abrupt change rising edge on the power frequency oscillation inductance L into a logic level signal required by a control circuit, converts the logic level signal into an optical signal, and transmits the optical signal to the trigger phase control unit (20) through an optical fiber;
thirdly, the triggering phase control unit (20) converts the optical signal output by the power frequency oscillation starting detection unit (10) into a logic high level signal, latches and maintains the high level, the triggering phase control unit (20) takes the rising edge of the logic high level as a reference, outputs a pulse electric signal with fixed pulse width after a preset delay time, converts the pulse electric signal into an optical signal with the same pulse width time, and transmits the optical signal to the photoelectric conversion and ignition unit (30) through an optical fiber;
and fourthly, the photoelectric conversion and ignition unit (30) converts the optical signal output by the trigger phase control unit (20) into a pulse electric signal with the width equal to the duration of the optical signal, the pulse electric signal is used as a driving signal to drive the amplifying isolation circuit to generate high-voltage pulse, the high-voltage pulse acts on the impulse voltage ignition ball gap (50), the impulse voltage loop is started to output impulse voltage to be applied to two ends of the sample (40), and one test operation is finished.
2. The synchronous control method for the power frequency freewheel interruption capability test synthesis loop of claim 1, wherein the method comprises the following steps: the power supply of the power frequency oscillation starting detection unit (10) is a button cell, and the signal transmission time delay is within 100 ns; triggering the phase control unit (20) to transmit signals with delay within 200 ns; the signal transmission delay of the photoelectric conversion and ignition unit (30) circuit is within 100 ns.
3. The synchronous control method for the power frequency freewheel interruption capability test synthesis loop of claim 1, wherein the method comprises the following steps: the power frequency oscillation starting detection unit (10) comprises a power frequency oscillation triggering circuit (11) and an electric optical signal conversion circuit (12), the power frequency oscillation triggering circuit (11) comprises a resistor voltage divider and an optical coupler OP1, the resistor voltage divider is connected in parallel with two ends of a power frequency oscillation inductor L, the resistor voltage divider divides the upper voltage of the power frequency oscillation inductor L into low-voltage signals in proportion and then drives the optical coupler OP1 to output triggering signals, and the triggering signals drive the electric optical signal conversion circuit (12) to emit optical signals.
4. A method for synchronously controlling a power frequency freewheel interruption capability test synthesis loop as claimed in claim 3, wherein: the resistor voltage divider is formed by sequentially connecting resistors R1, R2, R3 and R4 in series, one end of the resistor R4 is grounded and serves as a low-voltage end, and the other end of the resistor R4 is connected with the resistor R3 and serves as a high-voltage end.
5. The synchronous control method for the power frequency freewheel interruption capability test synthesis loop of claim 4, wherein: the power frequency oscillation triggering circuit (11) further comprises a transient suppression diode D1 connected in parallel with the resistor R4, wherein the cathode of the transient suppression diode D1 is connected with the high-voltage end of the resistor divider, the anode of the transient suppression diode D1 is connected with the low-voltage end, the cathode of the transient suppression diode D1 is connected to the anode of the light emitting diode of the optocoupler OP1, and the anode of the transient suppression diode D1 is connected to the cathode of the light emitting diode of the optocoupler OP1 so as to prevent the primary side of the optocoupler OP1 from being broken down by reverse voltage.
6. A method for synchronously controlling a power frequency freewheel interruption capability test synthesis loop as claimed in claim 3, wherein: the electric-optical signal conversion circuit (12) comprises resistors R5, R6 and R7, a direct current power supply, a power driver U2 and a light-emitting diode U1, wherein the power driver U2 comprises a NAND gate (121) and a triode (122), the output emitter of the optical coupler OP1 is connected with the ground of the power supply, the collector is pulled up through the resistor R5 and then used as one input of the NAND gate (121) in the power driver U2, when the power frequency oscillation starts, the input becomes low level, the other input of the NAND gate (121) is connected with the direct current power supply, and the direct current power supply is connected to the anode of the light-emitting diode U1 through the resistor R7 and is connected to the cathode of the light-emitting diode U1 through the resistor R6; the collector of the triode 122 in U2 is connected to the common node of the resistor R6 and the cathode of the light emitting diode U1, the emitter is connected to the power ground, and when one input of U2 is at a low level, the built-in triode (122) is driven to be conducted, and the light emitting diode U1 emits a light signal.
7. The synchronous control method for the power frequency freewheel interruption capability test synthesis loop of claim 1, wherein the method comprises the following steps: the trigger phase control unit (20) comprises a photoelectric signal conversion circuit (21), a latch and delay control circuit (22) and an electric light signal conversion circuit (23) which are connected in series,
the photoelectric signal conversion circuit (21) comprises an optical signal receiving head U3, resistors R8, R9, R10 and R11 and a triode Q1, wherein the collector of the optical signal receiving head U3 is pulled up to a +5V power supply through the resistor R8, when receiving an optical signal transmitted by the power frequency oscillation starting detection unit 10, the U3 outputs a low-level signal to the base of the triode Q1 through the resistor R9, the triode Q1 is cut off, the collector of the triode Q1 jumps to a high level, and the signal is transmitted to the latch and delay control circuit (22) through the resistor R11;
the latch and delay control circuit (22) comprises a high-level latch circuit and a delay control circuit, the high-level latch circuit latches the high-level signal transmitted by the resistor R11, the delay control circuit receives the latched high-level signal, and a pulse level signal with a fixed width is output by taking a high-level rising edge as a reference and passing through a preset delay time;
the electric-optical signal conversion circuit (23) is used for outputting an optical signal with the duration equal to the time width of the pulse level signal according to the pulse level signal with the fixed width output by the latch and delay control circuit (22).
8. The method for synchronously controlling the power frequency freewheel interruption capability test synthesis loop of claim 7, wherein: the electric-optical signal conversion circuit (23) comprises resistors R13, R14, R7, a direct current power supply, a power driver U4 and a light emitting diode U5, pulse level signals output by the latch and delay control circuit (22) are transmitted to one input end of a NAND gate of the power driver U4, the other input end of the NAND gate is connected with the direct current power supply and is always a high level signal, and the direct current power supply is connected to the anode of the light emitting diode U5 through the resistor R14 and is connected to the cathode of the light emitting diode U5 through the resistor R13; the collector of the triode in U4 is connected to the common node of the resistor R13 and the cathode of the light emitting diode U5, and the emitter is connected to the power ground.
9. The synchronous control method for the power frequency freewheel interruption capability test synthesis loop of claim 1, wherein the method comprises the following steps: the photoelectric conversion and ignition unit (30) comprises a photoelectric signal conversion circuit (31) and an ignition unit (32), the photoelectric signal conversion circuit (31) comprises an optical signal receiving head U6, a resistor R15, a resistor R16, a resistor R17, a capacitor C3 and a triode Q2, after the optical signal receiving head U6 receives an optical signal sent by a trigger phase control unit (20), a collector electrode jumps to be low level, the low level signal is connected to a base electrode of the triode Q2 through the resistor R16, the triode Q2 is driven to be cut off, a collector electrode of the Q2 jumps to be high level, the ignition unit (32) comprises resistors R18, R19 and R20, an energy storage capacitor C4, a MOS tube Q3, a pulse transformer T1 and an impulse voltage ignition bulb (50), the high level signal on the collector electrode of the triode Q2 drives the MOS tube Q3 through the resistor R18, the on time is equal to the duration of the received high level signal, the energy storage capacitor C4 is sequentially connected with a primary side winding of the pulse transformer T1, a drain electrode of the MOS tube Q3, a current limiting resistor R19 to the source electrode of the MOS tube Q3, and the pulse transformer T1 is connected to the impulse voltage ignition bulb (the impulse voltage is connected to the impulse voltage bulb) in series through the impulse transformer R20 to the impulse voltage ignition bulb (50).
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| CN107505553A (en) * | 2017-08-29 | 2017-12-22 | 国网湖南省电力公司 | A kind of power frequency continued flow experimental rig and its application method |
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| CN108037399B (en) * | 2018-02-07 | 2020-10-02 | 国网湖北省电力有限公司电力科学研究院 | 35kV lightning arrester power frequency follow current interruption capability testing device and method |
| CN109581113B (en) * | 2018-12-11 | 2020-10-16 | 武汉水院电气有限责任公司 | Multi-cavity gap lightning protection device power frequency follow current interruption capability test loop |
| CN110275078B (en) * | 2019-07-16 | 2021-10-15 | 国网江苏省电力有限公司电力科学研究院 | Method and system for distinguishing secondary cable ground loop disturbance of transformer substation and storage medium |
| CN110398675A (en) * | 2019-07-17 | 2019-11-01 | 中国电力科学研究院有限公司 | A kind of method and system for the measurement to power frequency and impact superimposed voltage waveform |
| CN113391151A (en) * | 2021-06-11 | 2021-09-14 | 江苏法拉电子有限公司 | Capacitor quality inspection system based on large current impact |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0582277A (en) * | 1990-09-07 | 1993-04-02 | Matsushita Electric Ind Co Ltd | Discharge lamp lighting device |
| CN101320058A (en) * | 2008-06-30 | 2008-12-10 | 西安交通大学 | Intelligent light emission/receiving control device of thunder and lightning test equipment of overvoltage protector |
| CN103236701A (en) * | 2013-04-10 | 2013-08-07 | 李国勇 | Triggering device and triggering control method for thyristor valve block of high-voltage TSC (thyristor switched capacitor) |
| CN104237751A (en) * | 2014-09-23 | 2014-12-24 | 广东电网有限责任公司佛山供电局 | Device for testing power frequency follow current intercepting capability of lightning protection device |
| CN104297647A (en) * | 2014-10-16 | 2015-01-21 | 四川大学 | Controllable power frequency superposition impulse testing device and testing method thereof |
| CN206460145U (en) * | 2016-12-21 | 2017-09-01 | 国家电网公司 | A kind of power frequency continued flow breaking capacity test synthesis loop sync control device |
-
2016
- 2016-12-21 CN CN201611190493.5A patent/CN106526476B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0582277A (en) * | 1990-09-07 | 1993-04-02 | Matsushita Electric Ind Co Ltd | Discharge lamp lighting device |
| CN101320058A (en) * | 2008-06-30 | 2008-12-10 | 西安交通大学 | Intelligent light emission/receiving control device of thunder and lightning test equipment of overvoltage protector |
| CN103236701A (en) * | 2013-04-10 | 2013-08-07 | 李国勇 | Triggering device and triggering control method for thyristor valve block of high-voltage TSC (thyristor switched capacitor) |
| CN104237751A (en) * | 2014-09-23 | 2014-12-24 | 广东电网有限责任公司佛山供电局 | Device for testing power frequency follow current intercepting capability of lightning protection device |
| CN104297647A (en) * | 2014-10-16 | 2015-01-21 | 四川大学 | Controllable power frequency superposition impulse testing device and testing method thereof |
| CN206460145U (en) * | 2016-12-21 | 2017-09-01 | 国家电网公司 | A kind of power frequency continued flow breaking capacity test synthesis loop sync control device |
Non-Patent Citations (1)
| Title |
|---|
| 李恒真 等.10kV带串联间隙防雷装置一体化联合试验装置的研制与试验.《高电压技术》.2016,第42卷(第11期),3464-3472. * |
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