CN215449401U

CN215449401U - Practical distribution network terminal residual voltage detection circuit

Info

Publication number: CN215449401U
Application number: CN202122169723.2U
Authority: CN
Inventors: 周学成; 龙晓明; 黄亮; 蒋忠华; 邓超艳; 孙勇卫
Original assignee: Wasion Electric Co Ltd
Current assignee: Weisheng Energy Technology Co ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2022-01-07
Anticipated expiration: 2031-09-07

Abstract

The utility model discloses a practical distribution network terminal residual voltage detection circuit, wherein a residual voltage resetting circuit is electrically connected with two residual voltage detection circuits, the two residual voltage detection circuits are respectively and electrically connected with two different rectification circuits, the residual voltage resetting circuit is composed of a fifth resistor, a sixth resistor and a triode, a second resistor is added at a second capacitor in the residual voltage detection circuit to serve as a load, and the two rectification circuits are half-bridge rectification circuits which are respectively composed of a fourth diode, a third diode and a 4 th pin of a transformer. The utility model provides a practical distribution network terminal residual voltage detection circuit, which adopts a half-bridge rectification circuit, adopts the same reset signal on the output of the reset signal and adopts a reset mode of being conducted in a triode control mode, thereby improving the reset speed to a certain extent.

Description

Practical distribution network terminal residual voltage detection circuit

Technical Field

The utility model relates to the field of power line fault detection, in particular to a practical distribution network terminal residual voltage detection circuit.

Background

In the residual voltage detection circuit, a detection circuit special for detecting the residual voltage of a column switch of primary equipment is provided, and the column switch is respectively arranged on two sides of a power supply side and a load side, so that two paths of residual voltage detection circuits are required to be designed to detect the primary equipment, facilitate fault detection, positioning and elimination, and further recover power supply to a non-fault side of the primary equipment. The patent with publication number CN110635459A discloses a two-way verified residual voltage locking method and circuit, which uses the pin states of two residual voltage circuits, the voltage signal of PT and the current signal of current transformer. The starting logic of each residual voltage circuit for acquiring the pin state is as follows: the voltage is more than or equal to 30% Un, the duration is more than or equal to 80ms, and the locking circuit is not started in a normal state. And when the pin states of the first residual voltage circuit and the second residual voltage circuit are not respectively a high level and a low level, and simultaneously the pin states of the first residual voltage circuit and the second residual voltage circuit are not respectively a low level and a high level, and the power supply is opposite to the original power supply, the fault alarm of the residual voltage circuit is output by the feeder line terminal.

However, through the design and analysis of the residual voltage circuit, when the residual voltage is detected, the capacitor is charged, and after the charging reaches a certain voltage, the relay is cut off to obtain an electric loop. After the capacitor is charged, no load discharges the capacitor, which affects the next residual voltage detection, even the residual voltage is not detected, so that the circuit switch is in failure, and all switches on the circuit are tripped. In addition, when the magnetic latching relay is reset, two reset signals are adopted, the two reset signals both need 24V voltage to drive the relay to reset, and the output of a controller pin does not reach 24V voltage, so that an optical coupler is added in the middle to carry out isolation drive control. The adoption of the two reset signals can be redundant, the optical coupler has certain time delay when being switched on, and the two reset signals cannot guarantee simultaneous operation, so that the method is not suitable for occasions requiring high reset speed, and the cost is increased to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to disclose a practical distribution network terminal residual voltage detection circuit aiming at the technical defects in the prior art.

In order to realize the purpose of the utility model, the technical scheme adopted by the utility model is as follows:

a practical residual voltage detection circuit of a distribution network terminal comprises a residual voltage resetting circuit, wherein the residual voltage resetting circuit is electrically connected with a residual voltage detection circuit, and the residual voltage detection circuit is electrically connected with a rectification circuit; the residual voltage resetting circuit comprises a first triode, a collector of the first triode is electrically connected with the residual voltage detection circuit, a base of the first triode is electrically connected with one end of a fifth resistor, an emitting electrode of the first triode is grounded, the other end of the fifth resistor is electrically connected with a residual voltage resetting signal, the residual voltage resetting signal is electrically connected with one end of a sixth resistor, and the other end of the sixth resistor is grounded.

Furthermore, the residual voltage detection circuit comprises a first residual voltage detection circuit and a second residual voltage detection circuit, and the first residual voltage detection circuit and the second residual voltage detection circuit are both electrically connected with the collector electrode of the first triode;

the first residual voltage detection circuit and the second residual voltage detection circuit are consistent in structure and respectively comprise a relay, a 2 nd pin of the relay is electrically connected with a collector electrode of a first triode, a 9 th pin of the relay is electrically connected with a 12V power supply, a 3 rd pin of the relay is grounded, a 4 th pin of the relay is electrically connected with a residual voltage detection signal and one end of a seventh resistor, and the other end of the seventh resistor is electrically connected with a 3.3V power supply; a 10 th pin of the relay is electrically connected with a cathode of the second diode, one end of the fourth resistor, one end of the first resistor, an anode of the first capacitor and the rectifying circuit; the 1 st pin of the relay is electrically connected with the anode of the second triode and the collector of the second triode, the base of the second triode is electrically connected with the anode of the first voltage-stabilizing diode, and the cathode of the first voltage-stabilizing diode is electrically connected with the other end of the fourth resistor and the collector of the third triode; the emitting electrode of the second triode is electrically connected with the emitting electrode of the third triode, one end of the third resistor, one end of the second resistor and the negative electrode of the second capacitor; the base of the third triode is electrically connected with the anode of the second voltage stabilizing diode and the other end of the third resistor, the second voltage stabilizing diode is electrically connected with the other end of the first resistor, and one end of the first resistor, which is connected with the second voltage stabilizing diode, is electrically connected with the anode of the second capacitor and the other end of the second resistor; and the negative electrode of the first capacitor is grounded.

Further, the rectifying circuit comprises a first rectifying circuit and a second rectifying circuit, the first rectifying circuit is electrically connected with the first residual voltage detection circuit, and the second rectifying circuit is electrically connected with the second residual voltage rectifying circuit.

Furthermore, the first rectification circuit and the second rectification circuit are consistent in structure, and both the first rectification circuit and the second rectification circuit are half-bridge rectification circuits.

Furthermore, the first rectification circuit and the second rectification circuit both comprise a transformer, a 1 st pin of the transformer is electrically connected with a first power supply of the circuit to be tested, a 2 nd pin of the transformer is electrically connected with a second power supply of the circuit to be tested, a 3 rd pin of the transformer is electrically connected with an anode of a third diode, a 4 th pin of the transformer is electrically connected with a cathode of a first capacitor, and a 5 th pin of the transformer is electrically connected with an anode of a fourth diode; and the cathode of the third diode and the cathode of the fourth diode are both electrically connected with the 10 th pin of the relay.

Furthermore, the 2 nd pins of the relay in the first residual voltage detection circuit and the second residual voltage detection circuit are electrically connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the 12V power supply.

Compared with the prior art, the utility model has the advantages that:

the same reset signal is adopted on the output of the reset signal, the single reset signal is high in timeliness, the reset mode that the triode is conducted in a controlled mode is adopted, the reset speed is improved to a certain extent, in addition, the discharge resistor is additionally arranged at the capacitor, and after residual voltage disappears, the capacitor discharges through the resistor, so that the next residual voltage detection is facilitated, and no misjudgment is generated, and the circuit is tripped.

Drawings

FIG. 1 shows a first residual voltage detection circuit and a residual voltage recovery circuit;

FIG. 2 is a diagram of a second residual voltage detection circuit;

wherein: v1 is a first triode, Q2 is a second triode, Q1 is a third triode, D4 is a first diode, D3 is a second diode, D2 is a third diode, D1 is a fourth diode, Z2 is a first zener diode, Z1 is a second zener diode, K1 is a relay, T1 is a transformer, UB is a first power supply, UC is a second power supply, CY _ FG is a residual voltage return signal, CY _ DY is a residual voltage detection signal, C1 is a first capacitor, C2 is a second capacitor, V12P _ IN is a 12V power supply, V3P3 is a 3.3V power supply, R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, R5 is a fifth resistor, R6 is a sixth resistor, and R7 is a seventh resistor.

Detailed Description

The utility model is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

As shown in fig. 1, pin 1 of transformer T1 is connected to UB of a first power source (also referred to as power source side of pole-mounted switch), pin 2 of transformer T1 is connected to UC of the first power source, pin 5 of transformer T1 is connected to anode of D1, pin 3 of transformer T1 is connected to anode of D2, cathode of D1 is connected to anode of C1, one end of R1, one end of R4, cathode of D3 and pin 10 of relay K1, anode of R1 is connected to anode of C1, the other end of R1 and cathode of Z1, anode of Z1 is connected to one end of R1 and base of Q1, the other end of R1 is connected to collector of Q1, cathode of Z1, anode of Z1 is connected to collector of Q1, collector of Q1 and collector of relay K1 are connected to collector of Q1V of relay K1, The 2 nd pin of the relay K1 and the anodes of the D4 are connected, the anode of the D4 is connected with a 12V power supply, the emitter of the V1 and the other end of the R6 are connected to GND, a residual voltage return signal (CY _ FG) is respectively connected with one end of the R5 and one end of the R6, the other end of the R5 is connected with the base of the V1, one end of the 4 th pin of the relay K1 and one end of the R7 are respectively connected with a residual voltage detection signal (CY _ DY) of the first power supply, the other end of the R7 is connected with a 3.3V power supply, the 3 rd pin of the relay, the emitter of the Q2, the emitter of the Q1, the other ends of the R3 and the R2, and the cathodes of the C1 and the C2 are respectively connected with the 4 th pin of the transformer T1 to GND. The residual voltage reset circuit is composed of resistors R5 and R6 and a triode V1. The 4 th pin of the diodes D1 and D2 and the transformer T1 form a half-bridge rectification circuit.

When detecting that the first power supply has residual voltage, the residual voltage signal is rectified by the half-bridge rectifier circuit and then outputs direct current, the residual voltage signal passes through the capacitor C1, the voltage stabilizing diode Z2 is conducted through the R4, the Q2 is conducted, the relay acts, and the detected residual voltage signal is transmitted to the control center. And meanwhile, the output direct-current voltage charges the C2 through the R1, when the voltage of the C2 reaches the breakdown voltage of the voltage stabilizing diode, the voltage stabilizing diode is conducted, current flows through, further, the Q1 is conducted, the Q1 is conducted, the Q2 is cut off, and therefore the action loop of the relay is cut off, and the K1 is a magnetic latching relay, so that when the action loop of the relay is cut off, the residual voltage detection signal is still kept to be output. After the residual voltage disappears, the C2 discharges through the discharge resistor R2, so that the result that misjudgment or undetected detection is caused to the next residual voltage detection is avoided.

Similarly, the connection mode of the residual voltage detection circuit of the second power supply and the residual voltage detection working mode in fig. 2 can be known. And after the residual voltage detection is completed and the fault is eliminated, resetting the residual voltage relay so as to detect the next residual voltage, wherein the same resetting signal and a resetting circuit are adopted when resetting the residual voltage detection relay. The residual voltage detection circuit that this patent provided still can detect the application time requirement according to actual residual voltage when the design, changes the length that the relay coil got the electric time through the size of change electric capacity C1's current-limiting resistor, and then makes things convenient for the residual voltage to detect next time.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a net terminal residual voltage detection circuitry is joined in marriage to practicality, includes residual voltage reset circuit, its characterized in that: the residual voltage resetting circuit is electrically connected with the residual voltage detection circuit, and the residual voltage detection circuit is electrically connected with the rectifying circuit; the residual voltage resetting circuit comprises a first triode, a collector of the first triode is electrically connected with the residual voltage detection circuit, a base of the first triode is electrically connected with one end of a fifth resistor, an emitting electrode of the first triode is grounded, the other end of the fifth resistor is electrically connected with a residual voltage resetting signal, the residual voltage resetting signal is electrically connected with one end of a sixth resistor, and the other end of the sixth resistor is grounded.

2. The practical distribution network terminal residual voltage detection circuit according to claim 1, characterized in that: the residual voltage detection circuit comprises a first residual voltage detection circuit and a second residual voltage detection circuit, and the first residual voltage detection circuit and the second residual voltage detection circuit are both electrically connected with the collector electrode of the first triode;

3. The practical distribution network terminal residual voltage detection circuit according to claim 2, characterized in that: the rectifying circuit comprises a first rectifying circuit and a second rectifying circuit, the first rectifying circuit is electrically connected with the first residual voltage detection circuit, and the second rectifying circuit is electrically connected with the second residual voltage rectifying circuit.

4. The practical distribution network terminal residual voltage detection circuit according to claim 3, characterized in that: the first rectifying circuit and the second rectifying circuit are consistent in structure, and both the first rectifying circuit and the second rectifying circuit are half-bridge rectifying circuits.

5. The practical distribution network terminal residual voltage detection circuit according to claim 4, wherein: the first rectifying circuit and the second rectifying circuit both comprise transformers, a 1 st pin of each transformer is electrically connected with a first power supply of the circuit to be tested, a 2 nd pin of each transformer is electrically connected with a second power supply of the circuit to be tested, a 3 rd pin of each transformer is electrically connected with the anode of the third diode, a 4 th pin of each transformer is electrically connected with the cathode of the first capacitor, and a 5 th pin of each transformer is electrically connected with the anode of the fourth diode; and the cathode of the third diode and the cathode of the fourth diode are both electrically connected with the 10 th pin of the relay.

6. The practical distribution network terminal residual voltage detection circuit according to claim 2, characterized in that: and the No. 2 pins of the relay in the first residual voltage detection circuit and the second residual voltage detection circuit are electrically connected with the anode of a first diode, and the cathode of the first diode is electrically connected with a 12V power supply.