CN106597134A - Intelligent distribution network secondary system phase sequence automatic check apparatus - Google Patents

Abstract

The invention discloses an automatic phase sequence checking device for a secondary system of an intelligent distribution network, which relates to the technical field of power equipment, including a power supply device, a voltage transformer, a current transformer, an acquisition device, an A/D conversion device, a processor and a display device ; When the phase sequence of the phase lines is checked after the installation of the distribution automation terminal is completed, the voltage transformer, current transformer and the phase line to be tested in the automation terminal are connected, and then the lead-out line of the acquisition device and the voltage transformer, current The transformer is connected. After the connection is completed, turn on the device to collect the three-phase current value, three-phase current phase value and voltage phase value of the phase line to be tested in the automation terminal, and make a comprehensive judgment based on the collected parameters to determine the phase sequence. Whether it is correct, so as to complete the phase verification work of the automation terminal, the operation steps of acceptance are simplified by using this device, and the efficiency of acceptance is improved.

Description

Intelligent distribution network secondary system phase sequence automatic check device

technical field

The invention relates to the technical field of electric power equipment, in particular to an automatic phase sequence checking device for a secondary system of an intelligent distribution network.

Background technique

With the continuous improvement of State Grid Corporation's requirements for the fine management level of distribution network, in order to improve the reliability of distribution network power supply and the professional management level of distribution network automation, the acceptance work of newly installed distribution automation terminal devices is particularly important. After the on-site installation of the distribution automation terminal is completed, acceptance work such as secondary circuit inspection and telemetry data verification is required. Since the current transformers are all installed on the construction site, the current transformers have been installed and the secondary lines have been connected during acceptance. The neutral points of current transformers and voltage transformers are connected to each phase line. To check the voltage and current of each phase line core, each phase line core of current and voltage must be disconnected from the neutral point line core. Undoubtedly, it increases the difficulty of acceptance work, greatly increases the working time of acceptance, and reduces the efficiency of acceptance work.

When checking the secondary wiring of voltage and current in the original technology, it is necessary to judge whether the secondary wiring of the voltage and current transformer is correct or not based on the data such as active power, reactive power, and power factor displayed by the power quality monitoring of the distribution automation terminal device. When there is a wiring error, it is necessary to use the method of manual drawing to judge the phase according to the measurement tools such as multimeter and clamp phase ammeter. This method is time-consuming, complicated and low in work efficiency.

Contents of the invention

The technical problem to be solved by the present invention is to provide an automatic phase sequence checking device for the secondary system of intelligent distribution network in view of the above-mentioned deficiencies in the prior art. high feature.

In order to solve the above technical problems, the technical solution adopted by the present invention is: an automatic phase sequence verification device for the secondary system of intelligent distribution network, including a power supply device, a voltage transformer, a current transformer, an acquisition device, an A/D conversion device, The processor and the display device; the voltage transformer is connected to the acquisition device, and the voltage transformer is used to convert the voltage, and the three-phase voltage to be measured is converted into a voltage signal that can be collected by the acquisition device; the current transformer is connected to the acquisition device, and the current transformer is used for Convert the current to convert the three-phase current to be measured into a current signal that can be collected by the acquisition device; the acquisition device is connected to the A/D conversion device, and the A/D conversion device converts the analog signal collected by the acquisition device into a digital signal; A/D The conversion device is connected with the processor, and the display device is connected with the processor.

Preferably, the current transformer is a clamp-shaped opening current transformer, and the selection of the clamp-shaped opening current transformer facilitates the connection with the power distribution automation terminal and is easy to operate.

Preferably, the display device is a liquid crystal display for displaying processing results, and the liquid crystal display can intuitively display the results, making it convenient for staff to obtain the results.

Preferably, the power supply device includes a voltage transformation circuit to supply power to the whole device, and the voltage transformation circuit in the power supply device can meet the needs of different voltages in the whole device.

Preferably, the collection device includes a voltage collection device and a current collection device. In this design, the collection device includes a voltage collection device and a current collection device at the same time, which can simultaneously collect the current and voltage signals of the power distribution automation terminal. Using this device makes the connection It is simpler and easier to operate, and the acquisition device can simultaneously collect voltage and current signals, reducing the number of components used in the device and reducing costs.

Preferably, the current collection device includes 4 current collection circuits, and the device can check 4 current signals at the same time, avoiding repeated wiring and disconnection of only one circuit at a time, and improving the efficiency of the check test.

The beneficial effects produced by adopting the above technical solution are: the present invention designs the phase sequence automatic checking device of the secondary system of the intelligent distribution network, and when the phase sequence of the phase line is checked after the distribution automation terminal is installed, the voltage transformer, Connect the current transformer with the phase wire to be tested at the automation terminal, and then connect the lead-out line of the acquisition device with the voltage transformer and current transformer. After the connection is completed, turn on the device to collect the three-phase current of the phase wire to be tested at the automation terminal Value, three-phase current phase value and voltage phase value, according to the comprehensive judgment of the collected parameters, it can be judged whether the phase sequence is correct, so as to complete the phase verification work of the automation terminal. By using this device, the operation steps of acceptance are simplified and improved. Acceptance efficiency.

Description of drawings

Fig. 1 is a functional block diagram of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, it is a functional block diagram of the phase sequence automatic checking device of the secondary system of the intelligent distribution network of the present invention, an automatic phase sequence checking device of the secondary system of the intelligent distribution network, including a power supply device, a voltage transformer, a current transformer, Acquisition device, A/D conversion device, processor and display device; the voltage transformer is connected to the acquisition device, the voltage transformer is used to convert the voltage, and converts the three-phase voltage to be measured into a voltage signal that can be collected by the acquisition device; the current transformer It is connected with the acquisition device, and the current transformer is used to convert the current, and convert the three-phase current to be measured into a current signal that can be collected by the acquisition device; The signal is converted into a digital signal; the A/D conversion device is connected with the processor, and the display device is connected with the processor.

When the phase sequence of the phase wires is checked after the distribution automation terminal is installed, connect the voltage transformer, current transformer and the phase wire to be tested in the automation terminal, and then connect the lead-out line of the acquisition device with the voltage transformer and current transformer. The function of the current transformer and the voltage transformer is to convert the current and voltage of the distribution automation terminal, and the conversion can enable the signal collected by the acquisition device. After the connection is completed, the device can be turned on to collect the phase line to be tested in the automation terminal. The three-phase current value, the three-phase current phase value and the voltage phase value can be comprehensively judged according to the collected parameters, and then it can be judged whether the phase sequence is correct, so as to complete the phase verification work of the automation terminal. By using the device, the operation steps of acceptance can be simplified and the efficiency of acceptance can be improved.

The current transformer is a clamp-shaped opening current transformer, and the selection of the clamp-shaped opening current transformer is convenient for connection with the distribution automation terminal and is easy to operate.

The display device is a liquid crystal display, which is used to display the processing results, and the liquid crystal display can intuitively display the results, which is convenient for the staff to obtain the results.

The power supply device includes a voltage transformation circuit, which can meet the needs of different voltages in the whole device through the voltage transformation circuit in the power supply device.

The acquisition device includes a voltage acquisition device and a current acquisition device. In this design, the acquisition device includes a voltage acquisition device and a current acquisition device at the same time, which can simultaneously collect the current and voltage signals of the distribution automation terminal. Using this device makes the connection easier , Easy to operate, and the acquisition device can simultaneously collect voltage and current signals, reducing the number of components used in the device and reducing costs.

The current acquisition device includes 4-channel current acquisition circuits. This device can check 4-channel current signals at the same time, avoiding the need for repeated wiring and disconnection when only 1 channel can be tested at a time, and improving the efficiency of the check test.

After adopting the above technical scheme, when the phase sequence of the phase wires is checked after the installation of the distribution automation terminal is completed, the voltage transformer, current transformer and the phase wire to be tested in the automation terminal are connected, and then the lead wire of the acquisition device and the phase wire to be tested are connected. The voltage transformer and current transformer are connected. After the connection is completed, turn on the device to collect the three-phase current value, three-phase current phase value and voltage phase value of the phase line to be tested in the automation terminal, and make a comprehensive judgment based on the collected parameters, that is It can judge whether the phase sequence is correct, so as to complete the phase verification work of the automation terminal. By using this device, the operation steps of acceptance are simplified and the efficiency of acceptance is improved.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (6)

1. a kind of intelligent network distribution electrical secondary system phase sequence automatic checking device, it is characterised in that：Including supply unit, mutual induction of voltage Device, current transformer, harvester, A/D conversion equipments, processor and display device；Voltage transformer and harvester connection, Voltage transformer is used to change voltage, the voltage signal that three-phase voltage to be measured is converted into being available for harvester to gather；Electric current is mutual Sensor and harvester connection, current transformer are used for switching current, will treat that measuring three-phase current is converted into being available for harvester to adopt The current signal of collection；Harvester and the connection of A/D conversion equipments, the analogue signal that harvester is gathered by A/D conversion equipments turn Change digital signal into；A/D conversion equipments and processor connection, display device and processor connection.

2. intelligent network distribution electrical secondary system phase sequence automatic checking device according to claim 1, it is characterised in that：The electric current Transformer is pincerlike opening current transformer.

3. intelligent network distribution electrical secondary system phase sequence automatic checking device according to claim 1, it is characterised in that：The display Device is LCDs, for display processing result.

4. intelligent network distribution electrical secondary system phase sequence automatic checking device according to claim 1, it is characterised in that：The power supply Device includes transforming circuit.

5. intelligent network distribution electrical secondary system phase sequence automatic checking device according to claim 1, it is characterised in that：The collection Device includes voltage collecting device and current collecting device.

6. intelligent network distribution electrical secondary system phase sequence automatic checking device according to claim 5, it is characterised in that：The electric current Harvester includes 4 road current collection circuits.