CN211785883U - Nimble controllable distribution network ground fault analogue means - Google Patents
Nimble controllable distribution network ground fault analogue means Download PDFInfo
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- CN211785883U CN211785883U CN202022051838.7U CN202022051838U CN211785883U CN 211785883 U CN211785883 U CN 211785883U CN 202022051838 U CN202022051838 U CN 202022051838U CN 211785883 U CN211785883 U CN 211785883U
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
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Abstract
The utility model discloses a flexible and controllable power distribution network ground fault simulation device, which comprises a power distribution network, a power distribution network and a power distribution network; the device comprises a voltage division module, a zero-crossing detection module, a digital signal processing module, a control module, a switching tube and a ground fault simulation module; the first output end of the voltage division module is connected with the control end of the switching tube through the zero-crossing detection module and the digital signal processing module in sequence; the second output end of the voltage division module is connected with the first end of the switch tube; the digital signal processing module is also connected with the signal sending module; the second end of the switching tube is grounded through the ground fault simulation module; the ground fault simulation module is formed by a plurality of branch resistors in parallel; the device can be used for simulating the influence of different resistance values and different grounding angles on the grounding fault of the power distribution network, can also be used for simulating the permanent, instantaneous and intermittent grounding faults, and improves the practicability of the grounding fault simulation device.
Description
Technical Field
The utility model relates to a technical field of distribution network single-phase earth fault simulation especially relates to a nimble controllable distribution network earth fault analogue means.
Background
The distribution network in China generally adopts a mode that a neutral point is not grounded, and the neutral point is grounded through an arc suppression coil or a small resistor. In power distribution networks, single-phase earth faults are the most commonly occurring faults. The problem of low-current grounding line selection is not well solved all the time because fault signals are small and the characteristics are not obvious and great difficulty is caused to detection.
In recent years, various new technologies, such as a transient state line selection technology, a traveling wave line selection section determination technology and the like, are gradually adopted, but the validity of the new technologies is difficult to verify on site due to condition limitation, so that the problem that various types of faults are difficult to simulate cannot be well solved, further factors influencing ground faults cannot be effectively controlled, and the stability of a power distribution network is not improved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a nimble controllable distribution network ground fault analogue means can simulate the influence to distribution network ground fault of different resistance values, improves ground fault analogue means's practicality.
In order to solve the technical problem, the embodiment of the utility model provides a nimble controllable distribution network ground fault analogue means is provided, include: the device comprises a voltage division module, a zero-crossing detection module, a digital signal processing module, a control module, a switching tube and a ground fault simulation module; the input end of the voltage division module is connected with a power supply; a first output end of the voltage division module is connected with a first input end of the digital signal processing module through the zero-crossing detection module; the second output end of the voltage division module is connected with the first end of the switch tube; the third output end of the voltage division module is grounded; the second input end of the digital signal processing module is connected with the signal sending module; the output end of the digital signal processing module is connected with the control end of the switch tube through the control module; the second end of the switch tube is grounded through the ground fault simulation module;
the ground fault simulation module comprises N isolating switches and N-1 resistors, wherein the first end of each isolating switch is connected with the second end of the switch tube, the second end of the first isolating switch is grounded, and the second end of the nth isolating switch is grounded through one resistor; wherein N > 1; n = 2.
Further, the voltage division module is a voltage transformer.
Further, the zero-crossing detection module comprises a voltage comparator, a trigger, an optical coupling isolator, a first resistor, a second resistor and a third resistor;
the positive input end of the voltage comparator is connected with the first output end of the voltage division module, the negative input end of the voltage comparator is grounded, and the output end of the voltage comparator is respectively connected with the first end of the first resistor and the first end of the trigger;
the second end of the first resistor is respectively connected with a power supply and the first end of the second resistor;
the first end of optical coupling isolator with the second end of second resistance is connected, the second end of optical coupling isolator with the second end of trigger is connected, the third end ground connection of optical coupling isolator, the fourth end of optical coupling isolator respectively with the first end of third resistance the first input end of digital signal processing module is connected, the second end of third resistance with the power is connected.
Further, the digital signal processing module is a DSP processor.
Further, the control module comprises a photoelectric isolation trigger.
Further, the switch tube is a bidirectional thyristor switch; the grid terminal of the bidirectional controllable silicon switch is the control end of the switch tube, and the first main terminal of the bidirectional controllable silicon switch is the first end of the switch tube; and the second main terminal of the bidirectional controllable silicon switch is the second end of the switch tube.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the embodiment of the utility model provides a flexible and controllable distribution network ground fault simulation device, including partial pressure module, zero cross detection module, digital signal processing module, control module, switch tube, ground fault simulation module; the input end of the voltage division module is connected with a power supply; a first output end of the voltage division module is connected with a first input end of the digital signal processing module through the zero-crossing detection module; the second output end of the voltage division module is connected with the first end of the switch tube; the third output end of the voltage division module is grounded; the second input end of the digital signal processing module is connected with the signal sending module; the output end of the digital signal processing module is connected with the control end of the switch tube through the control module; the second end of the switch tube is grounded through the ground fault simulation module; the ground fault simulation module comprises N isolating switches and N-1 resistors, wherein the first end of each isolating switch is connected with the second end of the switch tube, the second end of the first isolating switch is grounded, and the second end of the nth isolating switch is grounded through one resistor; wherein N > 1; n =2,.., N; the device can control the influence of different resistance values on the ground fault of the power distribution network through the switching state of each isolating switch in the fault simulation module, and improves the practicability of the ground fault simulation device.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a flexibly controllable power distribution network ground fault simulation apparatus provided by the present invention;
fig. 2 is a schematic structural diagram of a still another preferred embodiment of the flexibly controllable power distribution network ground fault simulation apparatus provided by the present invention;
fig. 3 is a schematic structural diagram of a zero-crossing detection module provided by the present invention;
fig. 4 is a schematic view of a connection structure between a control module and a switch tube provided by the present invention;
fig. 5 is a timing diagram of intermittent ground fault triggering provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, it is a schematic structural diagram of a preferred embodiment of the flexibly controllable power distribution network ground fault simulation apparatus provided by the present invention, and the circuit includes: the device comprises a voltage division module, a zero-crossing detection module, a digital signal processing module, a control module, a switching tube and a ground fault simulation module; the input end of the voltage division module is connected with a power supply; a first output end of the voltage division module is connected with a first input end of the digital signal processing module through the zero-crossing detection module; the second output end of the voltage division module is connected with the first end of the switch tube; the third output end of the voltage division module is grounded; the second input end of the digital signal processing module is connected with the signal sending module; the output end of the digital signal processing module is connected with the control end of the switch tube through the control module; the second end of the switch tube is grounded through the ground fault simulation module;
the ground fault simulation module comprises N isolating switches and N-1 resistors, wherein the first end of each isolating switch is connected with the second end of the switch tube, the second end of the first isolating switch is grounded, and the second end of the nth isolating switch is grounded through one resistor; wherein N > 1; n = 2.
In yet another preferred embodiment, see fig. 2, the voltage divider module is a voltage transformer; the voltage transformer may be, but is not limited to, a capacitor, a resistor, and an inductor.
In this embodiment, the specific working principle of the voltage dividing module is as follows: the voltage division module divides the three-phase voltage, reduces the amplitude of the high voltage to adapt to the adoption requirement of secondary equipment, assumes that the side voltage value of the three-phase voltage is the rated voltage of the power grid system, and the voltage passing through the voltage division module is 100V or
。
In yet another preferred embodiment, referring to fig. 3, the zero-crossing detection module includes a voltage comparator, a flip-flop, an optical coupler isolator, a first resistor (5.1 k Ω), a second resistor (330 Ω), and a third resistor (10 k Ω); a positive input end 3 of the voltage comparator is connected with a first output end of the voltage division module, a negative input end 2 of the voltage comparator is grounded, and an output end 1 of the voltage comparator is respectively connected with a first end of the first resistor (5.1 k omega) and a first end 1 of the trigger; the second end of the first resistor (5.1 k omega) is respectively connected with a power supply and the first end of the second resistor (330 omega); the first end 1 of optical coupler isolator with the second end of second resistance (330 omega) is connected, the second end 2 of optical coupler isolator with the second end 2 of trigger is connected, the third end 3 ground connection of optical coupler isolator, the fourth end 4 of optical coupler isolator respectively with the first end of third resistance (10 k omega), the first input end of digital signal processing module is connected, the second end of third resistance (10 k omega) with the power is connected.
The voltage comparator can be but is not limited to an LM393 voltage comparator, and the trigger can be but is not limited to a 40106BD reverse Schmitt trigger; the optocoupler isolator can be, but is not limited to, a TLP521-1 optocoupler isolator.
In this embodiment, the voltage comparator is used to convert the sinusoidal signal output by the voltage dividing module into a square wave signal, and the specific principle is as follows: when the input voltage of the voltage comparator is higher than the reference voltage of the voltage comparator, a high level signal is output, otherwise, a low level signal is output; the trigger is used for shaping the square wave signal output by the voltage comparator, so that the rising edge and the falling edge of the square wave are steep enough; the effect of opto-isolator carries out opto-coupler isolation, improves the reliability of device.
In yet another preferred embodiment, see fig. 2, the digital signal processing module is a DSP processor.
In this embodiment, the DSP processor is mainly configured to receive the square wave signal output by the zero-cross detection module and receive a control signal sent from the outside (signal sending module) to turn on or off the switching tube, and send a control instruction to the control module according to the control signal sent from the outside to turn on or off the switching tube and the square wave signal output by the zero-cross detection module. The signal sending module is connected to a pin of the DSP processor, and the pin is not particularly limited.
In yet another preferred embodiment, as can be seen in fig. 4, the control module includes a photo-electrically isolated trigger.
In this embodiment, the optoelectronic isolation trigger controls the switch tube to be in a conducting state or a blocking state mainly according to a control instruction sent by the digital signal processing module. The MOC3021 photoelectric isolation trigger is adopted as the photoelectric isolation trigger, so that photoelectric isolation can be performed, and the trigger element can be isolated from the high-power silicon controlled rectifier.
In yet another preferred embodiment, see fig. 2, the switching tube is a triac; the grid terminal of the bidirectional controllable silicon switch is the control end of the switch tube, and the first main terminal of the bidirectional controllable silicon switch is the first end of the switch tube; and the second main terminal of the bidirectional controllable silicon switch is the second end of the switch tube.
In this embodiment, the switch tube is a triac, which can control the on/off of the ground fault simulation device, and the triac can realize bidirectional controllable on/off. The bidirectional controllable silicon is an IGBT (insulated gate bipolar transistor), namely, the IGBT can be quickly turned off or turned on when a turn-on or turn-off command sent by the control module is received. If a permanent fault needs to be simulated, the IGBT is immediately turned on by the digital signal processing module when a rising edge or a falling edge of the voltage is detected; if the intermittent ground fault needs to be simulated, when the rising edge or the falling edge of the voltage is detected, the IGBT is controlled to be triggered or cut off by setting a certain time delay and then sending a trigger signal and a cut-off signal, and the required fault time phase angle and the intermittent ground fault are simulated; if the transient ground fault needs to be simulated, after the IGBT is triggered and turned on, the sending of the trigger command is stopped and the cut-off command is sent, so that the method can be realized. Through the bidirectional thyristor switch, permanent, instantaneous and intermittent ground faults can be simulated, and the stability of a power distribution system is improved.
The following description is made in conjunction with the above embodiments and is shown in fig. 2 and fig. 5 for the working principle of the flexible and controllable power distribution network ground fault simulation apparatus provided by the embodiments of the present invention:
suppose 1, the ground fault simulation module includes 4 disconnecting switches and 3 resistors, the resistance values of the 3 resistors are different and can be defined according to actual conditions, for example, the resistance value of the first resistor R1 is 4 Ω, the resistance value of the second resistor R2 is 2 Ω, the resistance value of the third resistor R3 is 6 Ω, a user needs to simulate the influence of different resistors on the ground fault of the distribution network, and can control the on-off state of each disconnecting switch by itself to control the influence of different resistors on the ground fault of the distribution network, for example, the influence of 2K Ω resistors on the ground fault of the distribution network needs to be examined, the third disconnecting switch K3 corresponding to the second resistor R2 is closed, and the rest first disconnecting switch, the second disconnecting switch and the fourth disconnecting switch are in an off state.
Assuming 2, simulating an intermittent ground fault, the user sends a trigger signal to the DSP processor according to an intermittent ground fault trigger timing diagram 5, for example, the user sends a trigger signal to the DSP processor at a turn-on trigger point 1 (also called a fault occurrence point 1, both of which represent the first 2 milliseconds of a zero crossing point 1), the DSP processor receives the trigger signal and sends a signal triggering turn-on of the triac to the control module, the control module controls the triac to turn on, the user sends a trigger signal to the DSP processor at a turn-off trigger point 1 (the turn-off trigger point 1 is also called a fault arc-out point 1, both of which represent the last 2 milliseconds of the zero crossing point 1) according to the intermittent ground fault trigger timing diagram, the DSP processor receives the trigger signal and sends a signal triggering the triac to the control module, the control module controls the bidirectional silicon controlled switch to be cut off; for another example, the user sends a trigger signal to the DSP processor at a turn-on trigger point 2 (also referred to as a fault occurrence point 2, both of which represent the first 2 milliseconds of a zero crossing point 2), the DSP processor receives the trigger signal and then sends a signal triggering the turn-on of the triac to the control module, the control module controls the triac to turn on, the user sends the trigger signal to the DSP processor at a turn-off trigger point 2 (the turn-off trigger point 2 is also referred to as a fault arc-extinguishing point 2, both of which represent the last 2 milliseconds of the zero crossing point 2) according to the intermittent ground fault trigger timing diagram, the DSP processor receives the trigger signal and then sends a signal triggering the turn-off of the triac to the control module, and the control module controls the triac to turn off. Intermittent earth fault simulation can be completed by cycling for a plurality of cycles through the method.
And 3, simulating a fault time phase angle, and sending a trigger signal to the DSP by the trigger signal sending module when the time sequence 5 is triggered by the intermittent ground fault at a zero crossing point 1 or a zero crossing point 2 by the user, and sending a signal for triggering the conduction of the bidirectional thyristor switch to the control module after the DSP receives the trigger signal. Equivalently, the trigger time of the bidirectional controllable silicon switch can be adjusted according to the zero crossing point.
Supposing 4, simulating a transient fault, and after the bidirectional thyristor is triggered and turned on for a plurality of periods (generally 5-10 cycles) by a user according to the intermittent ground fault triggering timing diagram 5, the triggering signal sending module sends a triggering signal to the DSP processor to trigger the bidirectional thyristor to be turned off and turned on, so that the purpose can be achieved.
Therefore, the embodiment of the utility model provides a nimble controllable distribution network ground fault analogue means controls the influence of different resistance values to distribution network ground fault through each isolator's among the fault simulation module switching state, improves ground fault analogue means's practicality. Through the cooperation of digital signal processing module, control module and switch tube, can simulate permanent, transient, intermittent type earth fault, further improve earth fault analogue means's practicality.
The present invention can be implemented by the above-mentioned preferred embodiments, it should be noted that, for those skilled in the art, without departing from the principles of the present invention, a plurality of improvements and decorations can be made, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. A nimble controllable distribution network ground fault analogue means which characterized in that includes: the device comprises a voltage division module, a zero-crossing detection module, a digital signal processing module, a control module, a switching tube and a ground fault simulation module; the input end of the voltage division module is connected with a power supply; a first output end of the voltage division module is connected with a first input end of the digital signal processing module through the zero-crossing detection module; the second output end of the voltage division module is connected with the first end of the switch tube; the third output end of the voltage division module is grounded; the second input end of the digital signal processing module is connected with the signal sending module; the output end of the digital signal processing module is connected with the control end of the switch tube through the control module; the second end of the switch tube is grounded through the ground fault simulation module;
the ground fault simulation module comprises N isolating switches and N-1 resistors, wherein the first end of each isolating switch is connected with the second end of the switch tube, the second end of the first isolating switch is grounded, and the second end of the nth isolating switch is grounded through one resistor; wherein N > 1; n = 2.
2. The flexibly controllable power distribution network ground fault simulation apparatus of claim 1, wherein the voltage divider module is a voltage transformer.
3. The flexibly controllable power distribution network ground fault simulation device of claim 1, wherein the zero-crossing detection module comprises a voltage comparator, a trigger, an optical coupler isolator, a first resistor, a second resistor, and a third resistor;
the positive input end of the voltage comparator is connected with the first output end of the voltage division module, the negative input end of the voltage comparator is grounded, and the output end of the voltage comparator is respectively connected with the first end of the first resistor and the first end of the trigger;
the second end of the first resistor is respectively connected with a power supply and the first end of the second resistor;
the first end of optical coupling isolator with the second end of second resistance is connected, the second end of optical coupling isolator with the second end of trigger is connected, the third end ground connection of optical coupling isolator, the fourth end of optical coupling isolator respectively with the first end of third resistance the first input end of digital signal processing module is connected, the second end of third resistance with the power is connected.
4. The flexibly controllable power distribution network ground fault simulation apparatus of claim 1, wherein the digital signal processing module is a DSP processor.
5. The flexibly controllable power distribution network ground fault simulation apparatus of claim 1, wherein the control module comprises a photo-electric isolation trigger.
6. The flexibly controllable power distribution network ground fault simulation apparatus of claim 1, wherein the switching tube is a triac; the grid terminal of the bidirectional controllable silicon switch is the control end of the switch tube, and the first main terminal of the bidirectional controllable silicon switch is the first end of the switch tube; and the second main terminal of the bidirectional controllable silicon switch is the second end of the switch tube.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327099A (en) * | 2020-10-30 | 2021-02-05 | 南方电网科学研究院有限责任公司 | Power distribution network earth fault line selection tripping method and device and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327099A (en) * | 2020-10-30 | 2021-02-05 | 南方电网科学研究院有限责任公司 | Power distribution network earth fault line selection tripping method and device and storage medium |
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