Multi-loop visual voltage monitoring device

Abstract

The utility model relates to a multi-loop visual voltage monitoring device which comprises an AC-DC power supply, a self-reset switch, a DC-DC isolation power supply, an on-off judgment display and once-closed display holding circuit, a detected switch node, a diode, a double-pole double-throw relay, a voltmeter, a rotary wave band switch and a rotary wave band switch indicating lamp. The output end of the AC-DC power supply is respectively connected with the input end of the DC-DC isolation power supply and one end of the rotary wave band switch through the self-reset switch, and the DC-DC isolation power supply, the on-off judgment display and once closed display holding circuit, the detected switch node, the double-pole double-throw relay and the diode are sequentially connected. According to the utility model, the added visual voltage monitoring device continuously monitors the voltage of the secondary control loop of each isolation switch of the substation in real time through multi-path voltage monitoring, thereby rapidly positioning the fault, greatly shortening the fault processing time, and practically guaranteeing the operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power equipment, especially a multi-loop visual voltage monitoring device. BACKGROUND

[0002] The 1500V isolating switch belongs to electrical equipment, and the opening and closing of the switch need to comply with the electrical five-prevention regulations to prevent the isolation switch from being opened and closed with load, and a circuit breaker normally open auxiliary contact is introduced in the isolating switch control circuit in the design to meet the five-prevention requirements and to lock the isolating switch at appropriate times.

[0003] The isolating switch control circuit fault is the biggest cause of the DC 1500V isolating switch failure. The circuit fault involves the power transformation professional, the overhead contact line professional and the power monitoring professional, and only the voltage monitoring device needs to be used to monitor the potential changes of the two professional circuits in the control circuit in advance, so that the fault position and the professional can be judged, and the fault positioning time can be shortened.

[0004] The existing fault positioning mode is as follows:

[0005] When the DC 1500V isolating switch failure occurs, the dispatching will notify the three professionals to handle the fault on site according to the requirements, the SCADA professional will handle the professional problem in the high-voltage control room of the substation, the overhead contact line professional will handle the professional problem in the track area, and the power transformation professional will handle the DC circuit breaker and isolating switch problem in the DC switch room, which causes the three professionals to check their own equipment in different spaces, and there is a great obstacle in communication, time is wasted, and the fault handling efficiency is low. UTILITY MODEL CONTENTS

[0006] The utility model provides a multi-loop visual voltage monitoring device to solve the problems mentioned in the prior art.

[0007] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0008] The multi-loop visual voltage monitoring device comprises an AC-DC power supply, a self-resetting switch, a DC-DC isolation power supply, an on-off judgment display and a once-closed display maintaining circuit, a measured switch node, a diode, a double-pole double-throw relay, a voltmeter, a rotary waveband switch and a rotary waveband switch indicator light, the output end of the AC-DC power supply is connected with the input end of the DC-DC isolation power supply and one end of the rotary waveband switch through the self-resetting switch, the DC-DC isolation power supply, the on-off judgment display and the once-closed display maintaining circuit, the measured switch node, the double-pole double-throw relay and the diode are sequentially connected, the double-pole double-throw relay is further connected with the rotary waveband switch and the rotary waveband switch indicator light, and the diode is further connected with the voltmeter.

[0009] As a further technical scheme of the utility model: the DC-DC isolated power supply, on-off judgment display and once-closed display maintaining circuit, measured switch node, diode all have 8, and the same structure, one-to-one correspondence.

[0010] As a further technical scheme of the utility model: the DC-DC isolated power supply includes chip U1, fuse F1, capacitor C1 and capacitor C9, the foot 1 of chip U1 connects capacitor C1 and fuse F1, the other end of fuse F1 connects power supply VCC, the other end of capacitor C1 connects the foot 2 of chip U1 and ground terminal, the foot 5 of chip U1 connects capacitor C9, the other end of capacitor C9 connects the foot 7 of chip U1, and the model of chip U1 is F1212S-1WR3.

[0011] As a further technical scheme of the utility model: the on-off judgment display and once-closed display maintaining circuit includes comparator U18.1, comparator U18.2, resistance R17, single-phase thyristor Q1 and indicator lamp LED13, the port 3 of comparator U18.1 connects the port 6 of comparator U18.2, resistance R25 and resistance R37, the port 2 of comparator U18.1 connects resistance R21 and resistance R29, the other end of resistance R29 connects resistance R41 and the port 5 of comparator U18.2, the port 1 of comparator U18.1 connects resistance R17, the other end of resistance R17 connects the positive pole of light-emitting diode G, the negative pole of light-emitting diode G connects the negative pole of light-emitting diode R and ground terminal, the port 7 of comparator U18.2 connects resistance R45, resistance R49 and resistance R50, the other end of resistance R45 connects the positive pole of light-emitting diode R, the other end of resistance R50 connects the control electrode of single-phase thyristor Q1, the positive pole of single-phase thyristor Q1 connects indicator lamp LED13, the other end of indicator lamp LED13 connects resistance R30, the other end of resistance R30 connects power supply AVCC1, and the other end of resistance R21 connects reference voltage VREF1.

[0012] As a further technical scheme of the utility model: the reference voltage VREF1 is provided by voltage reference circuit, and the voltage reference circuit includes three-terminal adjustable reference source U9 and resistance R2, the port 2 of three-terminal adjustable reference source U9 connects resistance R2, the port 1 of three-terminal adjustable reference source U9 and reference voltage VREF1, and the port 3 of three-terminal adjustable reference source U9 is grounded, and the model of three-terminal adjustable reference source U9 is CJ431.

[0013] As a further technical scheme of the utility model: the AC-DC power supply is 220VAC to 12VDC circuit.

[0014] In the above technical scheme, the technical effect and advantage provided by the utility model are as follows:

[0015] The visual voltage monitoring device added in the utility model, through multi-path voltage monitoring, real-time and continuous monitoring of the secondary control loop voltage of each disconnecting switch of the transformer substation, thereby quickly positioning the fault, greatly shortening the fault processing time, and practically guaranteeing the operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can also be obtained according of these drawings without creative labor.

[0017] Figure 1 It is the principle diagram of the utility model.

[0018] Figure 2 It is the first part circuit principle diagram of the utility model.

[0019] Figure 3 It is the second part circuit principle diagram of the utility model.

[0020] Figure 4 It is the disconnecting switch principle diagram. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described in the following by combining with the drawings in the embodiments of the utility model, obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments.Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] The utility model provides the drawing paper as Figures 1-4 The utility model discloses a multi-loop visual voltage monitoring device, including AC-DC power supply, self-resetting switch, DC-DC isolation power supply, on-off judgment display and once closed display keeping circuit, measured switch node, diode, double-pole double-throw relay, voltmeter, rotary wave band switch and rotary wave band switch pilot lamp, the output of AC-DC power supply is connected with the input of DC-DC isolation power supply and one end of rotary wave band switch respectively through self-resetting switch, DC-DC isolation power supply, on-off judgment display and once closed display keeping circuit, measured switch node, double-pole double-throw relay, diode are connected in proper order, and double-pole double-throw relay is also connected with rotary wave band switch and rotary wave band switch pilot lamp, and diode is also connected with voltmeter.

[0023] Among them, the DC-DC isolation power supply, on-off judgment display and once closed display holding circuit, measured switch node, diode are 8, and the structure is the same, one-to-one correspondence.

[0024] The DC-DC isolation power supply includes chip U1, fuse F1, capacitor C1 and capacitor C9, the foot 1 of chip U1 is connected with capacitor C1 and fuse F1, the other end of fuse F1 is connected with power supply VCC, the other end of capacitor C1 is connected with the foot 2 of chip U1 and ground terminal, the foot 5 of chip U1 is connected with capacitor C9, the other end of capacitor C9 is connected with the foot 7 of chip U1, and the model of chip U1 is F1212S-1WR3.

[0025] The on-off judgment display and once closed display holding circuit includes comparator U18.1, comparator U18.2, resistor R17, single-phase thyristor Q1 and indicator lamp LED13, the port 3 of comparator U18.1 is connected with the port 6 of comparator U18.2, resistor R25 and resistor R37, the port 2 of comparator U18.1 is connected with resistor R21 and resistor R29, the other end of resistor R29 is connected with resistor R41 and the port 5 of comparator U18.2, the port 1 of comparator U18.1 is connected with resistor R17, the other end of resistor R17 is connected with the positive electrode of light emitting diode G, the negative electrode of light emitting diode G is connected with the negative electrode of light emitting diode R and ground terminal, the port 7 of comparator U18.2 is connected with resistor R45, resistor R49 and resistor R50, the other end of resistor R45 is connected with the positive electrode of light emitting diode R, the other end of resistor R50 is connected with the control electrode of single-phase thyristor Q1, the positive electrode of single-phase thyristor Q1 is connected with indicator lamp LED13, the other end of indicator lamp LED13 is connected with resistor R30, the other end of resistor R30 is connected with power supply AVCC1, and the other end of resistor R21 is connected with reference voltage VREF1.

[0026] The reference voltage VREF1 is provided by voltage reference circuit, and the voltage reference circuit includes three-terminal adjustable reference source U9 and resistor R2, the port 2 of three-terminal adjustable reference source U9 is connected with resistor R2, the port 1 of three-terminal adjustable reference source U9 is connected with reference voltage VREF1, and the port 3 of three-terminal adjustable reference source U9 is grounded, and the model of three-terminal adjustable reference source U9 is CJ431. The AC-DC power supply is 220VAC to 12VDC circuit.

[0027] The working principle is as follows:

[0028] The design uses an AC / DC 220V to DC 12V 1A power supply for module power supply. An 8-band switch is used to control 8 relays for 8-way voltage selection switching and 8 LEDs are used to display the corresponding output relays. The moving contact of the relay is connected in parallel across the two ends of the measured node, and the normally open static contact is connected in series with a diode to prevent reverse current. Finally, a voltmeter is used for display. Eight DC 12V-DC 12V isolation power supplies are used to provide independent power for 8-way voltage monitoring. Eight TL431s are used to set a 2.495V voltage reference to independently provide voltage references for 8 groups of operational amplifiers. Eight groups of operational amplifiers are used to independently monitor 8-way input voltage in real time. The measured node is connected to the operational amplifier through resistance voltage division. When the switch node voltage is higher than 145V, the circuit is judged to be open, and the green light is on. When it is lower than 72V, the circuit is judged to be closed, and the red and yellow lights are on. When the red light is off, the yellow light remains on, indicating that the switch node has been closed and the corresponding SW button needs to be pressed to reset the signal light.

[0029] 1. Fault location principle and debugging:

[0030] (1) In the 1500V DC intertrip cabinet, parallel voltage monitoring devices are connected to the terminal blocks of each feeder cabinet interlock, and the isolation switch is applied to the electric governor. If the voltage detection device displays a voltage close to 220V, the switch node is open, and the fault belongs to the power supply professional;

[0031] (2) In the control signal screen (PC screen) cabinet, remote control the voltage monitoring devices connected in parallel to the secondary circuit terminal blocks, and apply to the electric governor. If the voltage detection device is high voltage and remains, the switch node is open, and the fault belongs to the power monitoring professional;

[0032] Monitoring the voltage changes of the above devices can quickly determine the professional attribution of the faulty equipment and locate the fault point. If the above two points are low voltage, the fault belongs to the catenary professional.

[0033] 2. Fault location debugging:

[0034] The above monitoring points are tested by connecting and setting each professional fault to test the ability of the voltage detection device to locate the fault point. The test results meet the design requirements.

[0035] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and in no way limiting, the scope of the present application being defined by the claims hereafter rather than the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be comprised in the present application.

[0036] Furthermore, it should be understood that, although the present specification is described according to the embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the present specification as a whole, and the technical solutions in each embodiment are also appropriately combined to form other embodiments which are easily understood by a person skilled in the art.

Claims

1. Multi-circuit visual voltage monitoring device, comprising AC-DC power supply, self-resetting switch, DC-DC isolation power supply, on-off judgment display and once-closed display holding circuit, measured switch node, diode, double-pole double-throw relay, voltmeter, rotary wave band switch and rotary wave band switch indicator light, characterized in that, The output end of the AC-DC power supply is connected with the input end of the DC-DC isolation power supply and one end of the rotary wave band switch through a self-resetting switch, the DC-DC isolation power supply, the on-off judgment display and the once-closed display holding circuit, the measured switch node, the double-pole double-throw relay, the diode are sequentially connected, the double-pole double-throw relay is further connected with the rotary wave band switch and the rotary wave band switch indicator, and the diode is further connected with the voltmeter.

2. The multi-circuit visualized voltage monitoring device of claim 1, wherein: The DC-DC isolation power supply, the on-off judgment display and the once-closed display holding circuit, the measured switch node and the diode are all eight in number and have the same structure and one-to-one correspondence.

3. The multi-circuit visualized voltage monitoring device of claim 1, wherein: The DC-DC isolation power supply comprises a chip U1, a fuse F1, a capacitor C1 and a capacitor C9, the pin 1 of the chip U1 is connected with the capacitor C1 and the fuse F1, the other end of the fuse F1 is connected with a power supply VCC, the other end of the capacitor C1 is connected with the pin 2 and the ground end of the chip U1, the pin 5 of the chip U1 is connected with the capacitor C9, the other end of the capacitor C9 is connected with the pin 7 of the chip U1, and the model of the chip U1 is F1212S-1WR3.

4. The multi-circuit visualized voltage monitoring device of claim 1, wherein: The on-off judgment display and the once-closed display holding circuit comprise a comparator U18.1, a comparator U18.2, a resistor R17, a single-phase thyristor Q1 and an indicator lamp LED13, the port 3 of the comparator U18.1 is connected with the port 6 of the comparator U18.2, a resistor R25 and a resistor R37, the port 2 of the comparator U18.1 is connected with a resistor R21 and a resistor R29, the other end of the resistor R29 is connected with a resistor R41 and the port 5 of the comparator U18.2, the port 1 of the comparator U18.1 is connected with the resistor R17, the other end of the resistor R17 is connected with the positive electrode of a light-emitting diode G, the negative electrode of the light-emitting diode G is connected with the negative electrode of a light-emitting diode R and the ground end, the port 7 of the comparator U18.2 is connected with a resistor R45, a resistor R49 and a resistor R50, the other end of the resistor R45 is connected with the positive electrode of the light-emitting diode R, the other end of the resistor R50 is connected with the control electrode of the single-phase thyristor Q1, the positive electrode of the single-phase thyristor Q1 is connected with the indicator lamp LED13, the other end of the indicator lamp LED13 is connected with a resistor R30, the other end of the resistor R30 is connected with a power supply AVCC1, and the other end of the resistor R21 is connected with a reference voltage VREF1.

5. The multi-circuit visual voltage monitoring device of claim 4, wherein: The reference voltage VREF1 is provided by a voltage reference circuit, and the voltage reference circuit comprises a three-terminal adjustable reference source U9 and a resistor R2, the port 2 of the three-terminal adjustable reference source U9 is connected with the resistor R2, the port 1 of the three-terminal adjustable reference source U9 is connected with the reference voltage VREF1, and the port 3 of the three-terminal adjustable reference source U9 is grounded, and the model of the three-terminal adjustable reference source U9 is CJ431.

6. The multi-circuit visualized voltage monitoring device of claim 4, wherein: The AC-DC power supply is a 220VAC-to-12VDC circuit.

Images