CN108072784B - Distribution lines residual voltage detection circuitry based on single pulse detects and control - Google Patents
Distribution lines residual voltage detection circuitry based on single pulse detects and control Download PDFInfo
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- CN108072784B CN108072784B CN201711234109.1A CN201711234109A CN108072784B CN 108072784 B CN108072784 B CN 108072784B CN 201711234109 A CN201711234109 A CN 201711234109A CN 108072784 B CN108072784 B CN 108072784B
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Abstract
The invention discloses a distribution line residual voltage detection circuit based on single pulse detection and control, and belongs to the technical field of distribution line residual voltage measurement. The detection circuit includes: the circuit is simple in structure, the duration of the residual voltage input event starting voltage applied to the relay is short through reasonably designing circuit parameters of all devices, further power consumption is avoided, and reliable operation of feeder line terminal equipment is facilitated.
Description
Technical Field
The invention discloses a distribution line residual voltage detection circuit based on single pulse detection and control, and belongs to the technical field of distribution line residual voltage measurement.
Background
In order to reduce the power failure time of the power distribution network and improve the power supply reliability, the feeder terminal applies voltage time type control logic through the feeder section switch according to the states of lines on two sides to realize safe power supply.
The state of the lines on both sides includes the situation of a past call, and a special auxiliary circuit (namely a residual voltage detection circuit) is needed to collect the residual voltage of the lines and keep the record until the feeder line terminal equipment reads and restores the residual voltage. The special auxiliary circuit avoids the defect that the feeder line terminal cannot work in the dead zone from power loss to stable restart operation.
The existing residual voltage detection method records and keeps the state of the incoming call as long as the incoming call exists, and has simple circuit but also has two defects. The first defect is that after the feeder line terminal equipment finishes reading, the residual voltage detection can report the incoming state again, the feeder line terminal equipment is required to filter the incoming state again, and once the feeder line terminal is restarted after power failure, the validity of the residual voltage detection state cannot be confirmed; the second disadvantage is that the feeder line terminal equipment is always in a starting state under the long-term electrified state of the circuit, and the power consumption is large, so that the reliable operation of the equipment is not facilitated.
Disclosure of Invention
The invention aims to provide a distribution line residual voltage detection circuit based on single pulse detection and control, which aims to overcome the defects of the background art, realize the detection of the distribution line residual voltage event and solve the technical problems that the existing distribution line residual voltage detection scheme cannot truly and accurately reflect an incoming call event, requires that a line is always electrified, can report false after a signal is restored and has larger power consumption for long-term electrification.
The invention adopts the following technical scheme for realizing the aim of the invention:
a distribution line residual voltage detection circuit based on single pulse detection and control comprises a rectifier bridge, a voltage division resistor, an energy storage capacitor, a discharge resistor, a charge capacitor and a voltage limiting diode, the bistable relay, the AC side of rectifier bridge connects the secondary side voltage of distribution line, one end of divider resistance connects the positive polarity DC bus of rectifier bridge, the other end of divider resistance is connected with one pole of energy storage capacitor, one end of discharge resistance, one pole of charging capacitor, the other pole of charging capacitor is connected with one end of bistable relay closing coil, the other end of discharge resistance, the other pole of energy storage capacitor is connected with the negative polarity DC bus of rectifier bridge after connecting in parallel, bistable relay opening coil connects the signal of returning, the voltage limiting diode is connected between the two terminals of bistable relay closing coil in reverse direction and in parallel.
Determining the resistance value R1 of a divider resistor according to the starting voltage VQ input by the residual voltage event and the coil internal resistance RJ of the bistable relay:
r2 is the resistance of the discharge resistor, and VJ is the operating voltage of the bistable relay.
The capacitance values of the energy storage capacitor and the charging capacitor meet the requirement of the bistable relay on the minimum starting time,
c2 is the capacitance of the charging capacitor, TJ is the minimum starting time of the bistable relay, RJ is the coil internal resistance of the bistable relay, K is the coefficient,
VJX is the minimum starting voltage of the bistable relay, VD is the conducting voltage of the voltage limiting diode, and the capacitance value C1 of the energy storage capacitor is at least the capacitance value C2 of the charging capacitor.
Selecting the resistance value of the discharge resistor according to the principle that the time spent by the energy storage capacitor to discharge through the discharge resistor until the voltage on the energy storage capacitor is lower than the minimum starting voltage of the bistable relay is less than the minimum time interval generated by the residual voltage again, and according to the expression: c1 × R2 is 1.2 × TW, and the resistance R2 of the discharge resistor is selected, and TW is the minimum time interval for the residual voltage to be generated again.
The conduction voltage of the voltage limiting diode is matched with the working voltage of the bistable relay, namely, the value of the conduction voltage of the voltage limiting diode is the value of the working voltage of the bistable relay or is not more than 1.2 times of the working voltage of the bistable relay.
By adopting the technical scheme, the invention has the following beneficial effects: the residual voltage detection circuit adopting single pulse detection and control detects a residual voltage electrifying event instead of the traditional residual voltage input real-time state, so that the false alarm of the residual voltage input real-time state caused by the reset of the residual voltage input when electrified can be avoided, even if a feeder line terminal is not reset in time, the detection result of the residual voltage event can not fail due to the restart of the feeder line terminal, the detection function of the residual voltage event is really realized, the circuit only comprises simple passive devices, the duration of the starting voltage of the residual voltage input event applied to a relay is very short by reasonably designing the circuit parameters of the devices, further power consumption is avoided, and the reliable operation of feeder line terminal equipment is facilitated.
Drawings
FIG. 1 is a flow chart of a method for designing circuit parameters according to the present invention.
FIG. 2 is a circuit diagram of the detection circuit of the present invention.
FIG. 3 is an equivalent circuit diagram of the pulse detection circuit of the present invention.
FIG. 4 is an equivalent circuit diagram of the single pulse control circuit of the present invention.
The reference numbers in the figures illustrate: d1 is a rectifier bridge, R1 is a divider resistor, C1 is an energy storage capacitor, R2 is a discharge resistor, C2 is a charge capacitor, D2 is a voltage limiting diode, and RLY1 is a bistable relay.
Detailed Description
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.
The invention relates to a distribution line residual voltage detection circuit based on single pulse detection and control, which is shown in figure 2 and comprises a rectifier bridge D1, a divider resistor R1, an energy storage capacitor C1, a discharge resistor R2, a charge capacitor C2, a voltage limiting diode D2 and a bistable relay RLY1, wherein the AC side of the rectifier bridge D1 is connected with the secondary side voltage of a distribution line, one end of the divider resistor R1 is connected with a positive polarity direct current bus of the rectifier bridge D1, the other end of the divider resistor R1 is connected with one pole of the energy storage capacitor C1, one end of the discharge resistor R2 and one pole of the charge capacitor C2, the other pole of the charge capacitor C2 is connected with one end of a bistable relay RLY1 closing coil, the other end of the relay RLY1 closing coil, the other end of the discharge resistor R2 and the other pole of the energy storage capacitor C1 are connected with the negative polarity direct current bus of the rectifier bridge D1 after being connected with each other, the bistable relay RLY1 closing, the voltage limiting diode D2 is reversely connected in parallel between two terminals of the closing coil of the bistable relay RLY 1.
The rectifier bridge is used for detecting power distribution line residual voltage electrifying signals, the energy storage capacitor and the discharge resistor form a discharge circuit with rapid energy storage and adjustable slow speed, the divider resistor and the bistable relay form a pulse detection circuit with adjustable voltage, and the charging capacitor connected with the bistable relay starting coil in series forms a single pulse control circuit.
The parameter design method of the distribution line residual voltage detection circuit based on single pulse detection and control is shown in fig. 1 and comprises the following steps:
step 1, after determining the starting voltage VQ input by the residual voltage event and the coil internal resistance RJ of the bistable relay, calculating a divider resistor R1 by combining with an equivalent circuit of the pulse detection circuit shown in FIG. 3,
r2 is the resistance value of the discharge resistor, and VJ is the working voltage of the bistable relay;
step 2, combining the equivalent circuit of the single pulse control circuit shown in fig. 4, determining the capacitance values of the energy storage capacitor and the charging capacitor according to the minimum starting time TJ of the bistable relay, selecting the conduction voltage of the voltage limiting diode according to the working voltage VJ of the bistable relay, wherein the capacitance value of the charging capacitor C2 is required to meet the requirement of the minimum starting time of the bistable relay RLY1, i.e., ensuring that the time from the initial voltage limiting diode conduction voltage VD to the minimum starting voltage VJX of the bistable relay gradually decays enough to start the relay, K x C2 x RJ>The total mass of TJ, namely,
the capacitance value of the energy storage capacitor C1 can be at least that of the charging capacitor C2, and in order to protect a bistable relay coil and ensure that the charging time of the charging capacitor in a single pulse control circuit is not influenced by the magnitude of residual voltage electrification voltage, the conduction voltage VD of the voltage limiting diode can be selected from VJ or VJ not more than 1.2 times;
and 3, selecting the resistance value of the discharge resistor according to the minimum time interval TW generated again by the residual voltage, as shown in fig. 2, when the power-on signal of the residual voltage loses power again, discharging the energy storage capacitor C1 through the discharge resistor R2 until the voltage on the energy storage capacitor C1 is lower than the minimum starting voltage VJX of the bistable relay, and when the relay with lower working voltage is selected, selecting C1 × R2 as 1.2 × TW for simplifying the design.
The starting voltage of the residual voltage input event can be set by adjusting the resistance value of the divider resistor, and the minimum time interval of the residual voltage regeneration can be matched by adjusting the resistance value of the discharge resistor.
An electrifying signal input by residual voltage outputs V1 after passing through a rectifier bridge, V1 quickly charges an energy storage capacitor C1 through a voltage dividing resistor R1, the charging time R1 of the energy storage capacitor C1 and the starting time of C1 relative to a relay are negligible, V1 directly applies voltage V3 to a closing coil of a bistable relay RLY1 through the charging capacitor C2, a switch in the relay is closed when the closing coil is electrified to output a signal representing a residual voltage event detection result, because the closing coil of the bistable relay RLY1 is connected with a voltage limiting diode D2 in parallel, the voltage V3 applied to the closing coil of the bistable relay RLY1 is gradually attenuated to zero along with the continuous rising of the voltage on the charging capacitor, and single pulse detection and control are completed.
When the residual voltage input electrifying signal reaches the minimum starting voltage VJX of the bistable relay coil and the duration applied to the coil exceeds the starting time of the bistable relay, the bistable relay is started, which indicates that the event of residual voltage electrifying signal is detected, the bistable relay keeps the starting state until the passive reset, and the switch in the relay restores to the normally open state when the reset signal is applied to the opening coil.
When the residual voltage electrifying signal loses power again, V1 is zero, the energy storage capacitor discharges the discharge resistor until the discharge resistor is zero, the discharge time of the discharge resistor is smaller than the minimum time interval generated by the residual voltage again, the whole process returns to the original place, and the next residual voltage event detection is waited.
Claims (3)
1. The utility model provides a distribution lines residual voltage detection circuit based on single pulse detects and control which characterized in that includes: the alternating current side of the rectifier bridge is connected with a secondary voltage measurement of a distribution line, one end of the divider resistor is connected with a positive-polarity direct current bus of the rectifier bridge, the other end of the divider resistor is connected with one pole of the energy storage capacitor, one end of the discharge resistor and one pole of the charge capacitor, the other pole of the charge capacitor is connected with one end of a closing coil of the bistable relay, the other end of the discharge resistor and the other pole of the energy storage capacitor are connected with a negative-polarity direct current bus of the rectifier bridge after being connected in parallel, the opening coil of the bistable relay is connected with a reset signal, the voltage limiting diode is connected between two terminals of the closing coil of the bistable relay in a reverse direction in parallel mode, and the capacitance values of the energy storage capacitor and the charge capacitor meet the requirement of the minimum starting time of the bistable relay, the conducting voltage of the voltage limiting diode is matched with the working voltage of the bistable relay, the resistance value of the discharge resistor is selected according to the principle that the time spent by the energy storage capacitor to discharge through the discharge resistor until the voltage on the energy storage capacitor is lower than the minimum starting voltage of the bistable relay is less than the minimum time interval generated by the residual voltage again, wherein,
the resistance value of the divider resistor is expressed by the following expression:
determining that R1 and R2 are resistance values of a divider resistor and a discharge resistor respectively, RJ is the coil internal resistance of the bistable relay, VQ is the starting voltage input by a residual voltage event, VJ is the working voltage of the bistable relay,
the capacitance value of the charging capacitor satisfies the expression:
c2 is the capacitance of the charging capacitor, TJ is the minimum starting time of the bistable relay, RJ is the coil internal resistance of the bistable relay, K is the coefficient,
VJX is the minimum starting voltage of the bistable relay, VD is the conducting voltage of the voltage limiting diode,
the resistance value of the discharge resistor is expressed as: c1 × R2 is selected as 1.2 × TW, C1 is the capacitance of the energy storage capacitor, R2 is the resistance of the discharge resistor, and TW is the minimum time interval for the residual voltage to regenerate.
2. The single pulse detection and control-based distribution line residual voltage detection circuit according to claim 1, wherein the capacitance value of the energy storage capacitor is greater than or equal to the capacitance value of the charging capacitor.
3. The single pulse detection and control-based distribution line residual voltage detection circuit according to claim 1, wherein the conduction voltage of the voltage limiting diode has a value equal to or not more than 1.2 times the operating voltage of the bistable relay.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109470960B (en) * | 2018-11-29 | 2021-04-27 | 中航通飞华南飞机工业有限公司 | Aircraft central authorities block terminal functional test device |
| CN109709374B (en) * | 2019-01-21 | 2021-03-16 | 江苏金智科技股份有限公司 | Residual voltage detection circuit |
| CN109842211B (en) * | 2019-03-04 | 2020-09-15 | 石家庄科林电气股份有限公司 | Residual voltage recording module and residual voltage detection method of recloser type feeder terminal |
| CN112067876B (en) * | 2020-07-23 | 2023-05-02 | 广西电网有限责任公司电力科学研究院 | Automatic reset residual voltage pulse hardware detection circuit |
| CN112803351B (en) * | 2020-12-31 | 2022-07-29 | 常州超芯科技有限公司 | Combined residual voltage detection protection device |
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