CN110007194A - A charging and discharging pile leakage fault location acquisition system - Google Patents

Abstract

The invention discloses a charging and discharging pile electric leakage fault positioning and collecting system, which comprises an alternating current meter, an electric quantity collecting terminal, a capacitive voltage divider and an overvoltage online detector, wherein the alternating current meter is connected with the electric quantity collecting terminal; an alternating current meter is connected in series with a power line of a charging and discharging pile connected to a power transmission line through distribution equipment, the output end of the alternating current meter is electrically connected with the input end of an electric quantity acquisition terminal, the acquisition end of a capacitive voltage divider is electrically connected to the power line of the charging and discharging pile, and the output end of the capacitive voltage divider is electrically connected with the input end of an overvoltage on-line detector; because the charge-discharge pile is connected into the power transmission line through the power distribution equipment, the alternating current meter is connected in series on the power line of the charge-discharge pile, the output end of the alternating current meter is electrically connected with the input end of the electric quantity acquisition terminal, the real-time monitoring of the charging running state is realized, the power line of the charge-discharge pile is also connected with the capacitive voltage divider, the output end of the capacitive voltage divider is electrically connected with the input end of the overvoltage on-line detector, the capacitive voltage divider is adopted to acquire an overvoltage signal, one-time wiring is not changed.

Description

A charging and discharging pile leakage fault location acquisition system

technical field

The invention relates to a charging and discharging pile leakage fault location acquisition system, which belongs to the field of power distribution system safety data acquisition.

Background technique

At present, with the continuous development of the power system, there are more and more ultra-high voltage and long-distance transmission lines, and it is more important to accurately locate the fault point of the line. In particular, intelligent electrical equipment is becoming more and more popular, and the charging safety problem of intelligent electrical equipment needs to be solved urgently. Intelligent electrical equipment means that through modern communication network technology, computer technology, automatic control technology, and radio frequency communication technology are effective It establishes its transmission network locally, and realizes the comprehensive dispatch of the power grid according to the peaks and troughs of the power consumption of the power grid and the matched loads. At this stage, the fault collection and location analysis of charging management information is not perfect. The grid interaction system cannot communicate well with the electrical equipment through the charging and discharging equipment, and cannot grasp the power consumption status and fault location of the electrical equipment in real time.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a charging and discharging pile leakage fault location and acquisition system.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A charging and discharging pile leakage fault location and acquisition system, which comprises an alternating current meter, a power acquisition terminal, a capacitor voltage divider and an overvoltage on-line detector; AC meter, the output end of the AC meter is electrically connected to the input end of the power collection terminal, the collection end of the capacitor voltage divider is electrically connected to the power line of the charging and discharging pile, and the output end of the capacitor voltage divider is electrically connected to the overvoltage The input terminal of the online detector.

Further, the capacitive voltage divider includes a current transformer CT and a voltage sensor, the power line of the charging and discharging pile serves as the primary winding of the current transformer CT, and the secondary winding of the current transformer CT is electrically connected to the input end of the voltage sensor. , the output end of the voltage sensor is connected to the overvoltage on-line detector.

Further, the output end of the voltage sensor is connected to the overvoltage online detector through a coaxial cable.

Further, the model of the power collection terminal is a three-phase power collection module of HC-33A or a DAM-35XX series intelligent AC power collection module.

Further, the charging and discharging pile leakage fault location and acquisition system further includes an optical network unit and an optical line terminal, and both the power acquisition terminal and the overvoltage online detector are connected to the optical line terminal through the optical network unit.

Further, Ethernet data is sent between the optical network unit and the optical line terminal in a broadcast manner.

Further, the charging and discharging pile leakage fault location and acquisition system further includes a main station computer, and the output signals of the overvoltage online detector and the power acquisition terminal are transmitted to the main station computer in real time through Ethernet.

Further, the overvoltage online detector includes a GPS synchronous clock module, a crystal oscillator, a counter and a clock recording module; a signal output end of the GPS synchronous clock module and a signal output end of the crystal oscillator are respectively connected to the input end of the counter, so The counter is provided with a corresponding input terminal for receiving the trigger signal, and the output terminal of the counter and the other signal output terminal of the GPS synchronization clock module are connected to the input terminal of the clock recording module.

Further, the on-line overvoltage detector further includes a memory, and the memory is electrically connected to the clock recording module.

The beneficial effect of the present invention is that: in the charging and discharging pile leakage fault location acquisition system of the present invention, since the charging and discharging pile is connected to the transmission line through the power distribution equipment, the AC meter is connected in series with the power line of the charging and discharging pile, and the output end of the AC meter is connected to the transmission line through the power distribution equipment. The input end of the power collection terminal is electrically connected to realize the real-time monitoring of the charging operation state. At the same time, since a capacitor voltage divider is also connected to the power line of the charging and discharging pile, the output end of the capacitor voltage divider is electrically connected to the overvoltage line. The input end of the detector uses a capacitor voltage divider to obtain the overvoltage signal without changing the primary wiring, which is safe and reliable; the overvoltage online detector detects the overvoltage waveform and triggering time at both ends of the power line in real time, and reaches the overvoltage by calculating the overvoltage signal. The online detector uses the time method to locate the fault, and the overvoltage online detection device adopts GPS synchronization, which improves the positioning accuracy.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

FIG. 1 is a structural principle block diagram of a charging and discharging pile leakage fault location and acquisition system in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a voltage obtained by a capacitor voltage divider in an embodiment of the present invention.

FIG. 3 is a working principle diagram of the overvoltage on-line detector in the embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be clearly and completely described below with reference to Figures 1 to 3 and specific embodiments.

As shown in Figures 1-3, this embodiment relates to a charging and discharging pile leakage fault location and acquisition system, which includes an AC meter, a power acquisition terminal, a capacitor voltage divider and an overvoltage online detector; An alternating current meter is connected in series to the power line of the charging and discharging pile of the transmission line, the output end of the alternating current meter is electrically connected to the input end of the power collection terminal, and the collecting end of the capacitor voltage divider is electrically connected to the power supply line of the charging and discharging pile On the upper side, the output end of the capacitive voltage divider is electrically connected to the input end of the overvoltage on-line detector.

Further, the capacitive voltage divider includes a current transformer CT and a voltage sensor, the power line of the charging and discharging pile serves as the primary winding of the current transformer CT, and the secondary winding of the current transformer CT is electrically connected to the input end of the voltage sensor. , the output end of the voltage sensor is connected to the overvoltage on-line detector.

Further, the output end of the voltage sensor is connected to the overvoltage online detector through a coaxial cable.

Further, the model of the power collection terminal is a three-phase power collection module of HC-33A or a DAM-35XX series intelligent AC power collection module.

Further, the charging and discharging pile leakage fault location and acquisition system further includes an optical network unit and an optical line terminal, and both the power acquisition terminal and the overvoltage online detector are connected to the optical line terminal through the optical network unit.

Further, Ethernet data is sent between the optical network unit and the optical line terminal in a broadcast manner.

Further, the charging and discharging pile leakage fault location and acquisition system further includes a main station computer, and the output signals of the overvoltage online detector and the power acquisition terminal are transmitted to the main station computer in real time through Ethernet.

Further, the overvoltage online detector includes a GPS synchronous clock module, a crystal oscillator, a counter and a clock recording module; a signal output end of the GPS synchronous clock module and a signal output end of the crystal oscillator are respectively connected to the input end of the counter, so The counter is provided with a corresponding input terminal for receiving the trigger signal, and the output terminal of the counter and the other signal output terminal of the GPS synchronization clock module are connected to the input terminal of the clock recording module.

Further, the on-line overvoltage detector further includes a memory, and the memory is electrically connected to the clock recording module.

In the charging and discharging pile leakage fault location acquisition system of this embodiment, since the charging and discharging pile is connected to the transmission line through the power distribution equipment, the AC meter is connected in series with the power line of the charging and discharging pile, and the output end of the AC meter is electrically connected to the power collection terminal. The input terminal realizes the real-time monitoring of the charging operation state. At the same time, since a capacitor voltage divider is also connected to the power line of the charging and discharging pile, the output terminal of the capacitor voltage divider is electrically connected to the input terminal of the overvoltage online detector. The capacitor voltage divider is used to obtain the overvoltage signal without changing the primary wiring, which is safe and reliable; the overvoltage online detector detects the overvoltage waveform and triggering time at both ends of the power line in real time, and calculates the time difference between the overvoltage signal and the overvoltage online detector. The fault location is carried out by means of the method, and the overvoltage on-line detection device adopts GPS synchronization, which improves the positioning accuracy.

The power acquisition terminal can choose the three-phase power acquisition module model HC-33A. It is a highly integrated product for three-phase power parameter measurement applications. The three-meter method can accurately measure three-phase AC voltage and three-phase current (true RMS measurement), total active power, reactive power, power factor, single-phase power, frequency, total active power in forward and reverse directions and other electrical parameters, 1 RS-485 communication interface, ultra-small shape, 9mm perforated type (large Up to 100A) current input directly, or external precision transformer can directly measure current up to 1000A, with excellent cost performance.

HC-3 series power acquisition modules can be widely used in electric power, communication, railway, transportation, environmental protection, petrochemical, steel and other industries to monitor the current and power consumption of large equipment driven by three-phase motors, as well as distribution networks and enterprises. Measurement and monitoring of medium and three-phase electric energy.

The optional model of the power acquisition terminal is DAM-35XX series intelligent AC power acquisition module, which can be used to measure the comprehensive parameters of AC power, including single-phase AC or three-phase AC. The measured parameters include voltage, current, active power, reactive power, apparent power, power factor, frequency, active energy, reactive energy and other parameters.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present invention.

Claims (9)

1. a kind of charge and discharge stake leak current fault positioning acquisition system, it is characterised in that: it includes AC ammeter, electric quantity acquisition end End, capacitive divider and overvoltage on-line detector；It is accessed by controller switching equipment on the power supply line of the charge and discharge stake of transmission line of electricity It is serially connected with AC ammeter, the input terminal of the output end electrical connection electric quantity acquisition terminal of the AC ammeter, the capacitive divider Collection terminal be connected electrically on the power supply line of charge and discharge stake, the output end of capacitive divider electrical connection overvoltage on-line detector Input terminal.

2. charge and discharge stake leak current fault positioning acquisition system according to claim 1, it is characterised in that: the capacitance partial pressure Device includes Current Transmit and voltage sensor, the power supply line of the charge and discharge stake as Current Transmit it is primary around Group, the input terminal of the secondary winding electrical connection voltage sensor of Current Transmit, the output end access of the voltage sensor Overvoltage on-line detector.

3. charge and discharge stake leak current fault positioning acquisition system according to claim 2, it is characterised in that: the voltage sensor The output end of device accesses overvoltage on-line detector by coaxial cable.

4. charge and discharge stake leak current fault positioning acquisition system according to claim 1, it is characterised in that: the electric quantity acquisition The three-phase electric quantity acquisition module or DAM-35XX Series Intelligent alternating current quantity sampling module of the model HC-33A of terminal.

5. charge and discharge stake leak current fault positioning acquisition system according to claim 1, it is characterised in that: it further includes light net Network unit and optical line terminal, the electric quantity acquisition terminal pass through optical network unit with overvoltage on-line detector and connect light Road terminal.

6. charge and discharge stake leak current fault positioning acquisition system according to claim 5, it is characterised in that: the optical-fiber network list Ethernet data is sent by broadcast mode between member and optical line terminal.

7. charge and discharge stake leak current fault positioning acquisition system according to claim 1 or 5, it is characterised in that: it further includes The output signal of master station computer, the overvoltage on-line detector and electric quantity acquisition terminal is real-time transmitted to master by Ethernet It stands computer.

8. charge and discharge stake leak current fault positioning acquisition system according to claim 1, it is characterised in that: the overvoltage exists Line detector includes GPS synchronised clock module, crystal oscillator, counter and clock recording module；The one of the GPS synchronised clock module The signal output end of signal output end and crystal oscillator is respectively connected to the input terminal of counter, and the counter is used equipped with respective input In receiving trigger signal, the output end of the counter and another signal output end incoming clock of GPS synchronised clock module are remembered Record the input terminal of module.

9. charge and discharge stake leak current fault positioning acquisition system according to claim 8, it is characterised in that: the overvoltage exists Line detector further includes memory, the memory and clock recording module electrical connection.