CN201514444U - High voltage power quality monitoring device - Google Patents

Abstract

The utility model relates to a high-voltage electric power monitoring device which comprises an electric power parameter collecting device, an electric power parameter monitoring device connected with the electric power parameter collecting device and a data transmission device connected with the electric power parameter monitoring device, wherein the terminal of the data transmission device is connected with the electric power parameter monitoring device by means of wireless signals; the electric power parameter monitoring device is connected with a lower computer data receiver of an electric power dispatching center through a cable converter; the electric power parameter collecting device comprises an electric power parameter collecting and calculating device and a current transformer and a voltage transformer, which are connected with the electric power parameter collecting and calculating device; a data mentoring software is arranged in the electric power parameter monitoring device; and the data transmission device transmits the data through the communication interface thereof. The high-voltage electric power monitoring device has the advantages of high safety performance, high conversion accuracy, portable measurement and strong function; and is applied to the power system, the industrial and mining enterprises, the oil field, the coal mine and the place with severe lack of electric power.

Description

High voltage power quality monitoring device

technical field

The utility model relates to a monitoring device, in particular to a high-voltage power quality monitoring device.

Background technique

With the vigorous development of my country's national economy, the power load has increased sharply, especially the continuous growth of impact and nonlinear load capacity, which has caused power quality problems such as waveform distortion, voltage fluctuation and flicker, and three-phase unbalance in the power grid. Due to the increase of grid capacity, the requirements for power quality are also increasing day by day. It is an indispensable part to effectively guarantee the power quality, line network loss and safe operation of the power system. In the power system, the voltage quality must reach the qualified range of the State Grid Corporation, the reactive power must be kept in situ balance, and the harmonic content must be kept within the allowable deviation range stipulated by the State Grid Corporation, otherwise, power loss and waste will occur. In serious cases, it will cause equipment damage and system disconnection. In addition, the power factor and voltage of the network are reduced, and the harmonic content exceeds the standard, so that the electrical equipment cannot be fully utilized, and the transmission capacity of the network is reduced. Therefore, it is extremely important to solve the power quality of the distribution network for the utilization of the power grid.

Data affecting power quality mainly include: system voltage, load current, power factor, reactive power, active power, and background harmonics. At present, there is no device for comprehensive monitoring of these data, only partial or single monitoring. Such as: the feeder terminal unit (FTU) installed in the traditional power distribution system, this kind of FTU device has the disadvantages of being unable to move at any time, relatively weak in data processing function and low in intelligence, so the monitoring quality of this kind of FTU device cannot be guaranteed.

Contents of the invention

The purpose of the utility model is to provide a high-voltage power quality monitoring device, which has the characteristics of being mobile at any time, powerful in data processing and high in intelligence, and solves the technical defect of low quality of power quality monitoring in the background technology.

The technical solution of the utility model is:

A high-voltage power quality monitoring device, including a power parameter acquisition device for real-time collection and upload of power grid data information, a power parameter monitoring device connected to the power parameter acquisition device to collect terminal data, complete storage, analysis and calculation of various data, and A data transmission device connected to the power parameter monitoring device, the terminal of the data transmission device is connected to the power monitoring device through a wireless signal, and the power monitoring device is connected to the lower computer data receiving device of the power dispatching center through wired switching,

Its special features are:

The electric energy parameter acquisition device includes an electric energy parameter acquisition operation device and a current transformer and a voltage transformer connected thereto; the electric energy parameter monitoring device has built-in data monitoring software; the data transmission device transmits data through its communication interface.

The above-mentioned current transformer is an open current transformer, and it is best not to cut off the wire during installation. .

The above-mentioned high-voltage power quality monitoring device is special in that it also includes a fuse for short-circuit protection of the device; the fuse is connected to the device through fuse protection.

The special feature of the above-mentioned high-voltage power quality monitoring device is that it also includes a lightning arrester; the lightning arrester is connected in parallel with the fuse and connected to the device.

The above-mentioned high-voltage power quality monitoring device is special in that it also includes a stainless steel box, and the fuse and lightning arrester are placed outside the stainless steel box.

The above-mentioned communication interface is preferably an RS-232 communication interface.

It is preferable that the above-mentioned electric energy parameter collection and operation control device is a digital electric energy parameter collection and operation control device.

The above-mentioned fuses are preferably remote-controlled and fully automatic drop-out fuses.

The above-mentioned arrester is a reinforced zinc oxide arrester is preferred.

The above-mentioned RS-232 communication interface is configured with a GPRS remote power parameter transmission device to realize remote parameter transmission through the mobile network.

The utility model has the following advantages:

1] High safety performance.

The voltage input adopts a high-voltage isolation device (2000V, response time ≤ 2μS), and the current input adopts a high-precision current transformer to safely isolate the input signal from the measurement system. This not only makes the device safe, reliable and convenient to use, but also greatly improves its anti-interference ability.

2] The collection and control system is easy to use.

It adopts Chinese interface, simple button operation, and is easy for users to use.

3] The structure is compact and beautiful.

The box body is made of cold-rolled steel plate or stainless steel, and the design is beautiful, light and handy, and it is very convenient to install and disassemble.

4] High precision conversion.

It meets the requirements of the national standard A-level testing equipment. It adopts the benchmark algorithm for harmonics, three-phase unbalance, flicker and fluctuation without approximate calculation. It adopts high-precision A/D (16-bit) and simultaneous sampling with a sampling rate of 12.8kHz. .

5] Strong function.

DSP+ARM+CPLD (digital signal processor + automatic program management system + complex programmable logic device) core is adopted, with fast processing speed and rich software functions, making this device suitable for complex test environment work and data processing work, greatly improving Test efficiency and level.

6] Communication interface.

The power quality monitor provides RS232 interface and GPRS interface, which is convenient for communication and data transmission in the background.

7] There are many test parameters.

System frequency, grid harmonics, three-phase voltage unbalance, voltage fluctuation and flicker, voltage deviation, voltage fundamental RMS and true RMS, current fundamental RMS and true RMS, fundamental active power, active power , Fundamental wave apparent power, power factor and other parameters stipulated by the five national standards of power quality.

8] Mass storage.

The power quality tester has a built-in 512M memory, which stores data in units of 5 minutes, and each channel can continuously store 4 months of historical data.

9] background management analysis software.

The power quality management and analysis software of this device is a background management and analysis software of power quality, which runs on WIN9X/2000/XP/NT operating system, has a friendly interface, and has graph and curve analysis functions.

10] It has the function of analyzing and counting the maximum value of electric energy parameters every day, and stores two months of time data.

The maximum value includes daily maximum voltage and minimum voltage of the grid; daily maximum current and minimum current; daily maximum power factor and minimum power factor; daily maximum active power and minimum active power; daily maximum reactive power and minimum reactive power; Harmonic content value.

11] The device is small in size, simple in installation, high in reliability, easy in maintenance, simple in software operation and friendly in display interface.

12] This device has strong mobility, and can be monitored on the line and equipment in real time and on the spot according to user requirements.

Description of drawings

Fig. 1 is a schematic diagram of the assembly structure of the utility model;

Among them (a) is the electric energy parameter acquisition part; (b) is the user control part.

Explanation of reference numerals: 1-electric energy parameter acquisition device, 11-electric energy parameter acquisition operation controller, 12-current transformer, 13-voltage transformer, 2-supervisor electrical energy parameter monitoring device, 3-data transmission device, 31- Lower computer communication transmission interface, 4-fuse, 5-lightning arrester, 6-stainless steel box, 7-lower computer data receiving device, 8-user dispatch center.

Detailed ways

A high-voltage power quality monitoring device, including a digital power parameter acquisition and calculation device for real-time collection and upload of power grid data information, connected with the digital power parameter acquisition and calculation device, responsible for collection of terminal data collection, storage, analysis and calculation of various data The electric energy parameter monitoring device 2 and the data transmission device 3 connected with the electric energy parameter monitoring device 2, the terminal of the data transmission device 3 is connected with the electric energy monitoring device 2 through the wireless signal, and the electric energy monitoring device 2 connects with the electric power dispatching center 8 through wired switching The lower computer data receiving device 7 is connected, and the digital electric energy parameter acquisition device includes an electric energy parameter acquisition operation device 11 and a current transformer 12 and a voltage transformer 13 connected thereto; the electric energy parameter monitoring device 2 has built-in monitoring software; the data transmission device 3 Data is transmitted through its RS-232 communication interface; the device also includes a remote-controlled fully automatic drop fuse for short-circuit protection; the remote-controlled fully automatic drop-out fuse is connected to the device through fuse protection; the device also includes Including the zinc oxide arrester; the zinc oxide arrester is connected in parallel with the remote-controlled automatic type drop fuse, and connected to the device, mainly to prevent damage to the device caused by lightning shock and play a protective role; the remote-controlled automatic type of the device Both the drop fuse and the zinc oxide arrester are placed outside a stainless steel box 6, which is considered in strict accordance with the relevant requirements of the high-voltage device design safety distance; the RS-232 communication interface of this device is equipped with a GPRS remote power parameter transmission module to realize remote wireless parameter transmission.

When connecting this device, see Figure 1, the voltage signals of phase A and C of the 10KV feeder line are first connected to the remote-controlled full-automatic drop-out fuse, and then the remote-controlled full-automatic drop-out fuse protects the access device through the fuse; First, the remote-controlled full-automatic drop fuse is mainly used to protect the device and the circuit when short-circuit or overload occurs; second, it provides convenience for power-off for device maintenance; the digital power parameter acquisition and calculation device collects 10KV feed Line B-phase current signal; voltage and current signals are respectively converted by transformation ratio, and finally the converted voltage and current signals are sent to the controller signal input terminal for power parameter conversion processing.

According to the requirements of power users, the device can be moved on the spot to monitor and collect the power parameters of the power grid; first, the power department needs to monitor the status of the power parameters at the head end of the feeder line, so the device can be directly installed in the first section of the feeder line to properly Second, the power department needs to monitor the status of the power quality parameters at the end, so the device can be directly installed at an appropriate position at the end for monitoring; Third, the power department needs to monitor the power parameter status at two-thirds of the feeder line , you can directly install the device in two-thirds of the place for monitoring; Fourth, the power department also needs to monitor the power parameters of the heavy-load concentrated area of the feeder line, and the device can be directly installed in the heavy-load concentrated area for monitoring Its five, the electric power sector needs to monitor the feeder line of special load change, can directly put this device into feeder line and monitor; Device mobility is very strong, completely replaces FTU (immovable shortcoming).

The main technical indicators are as follows:

★Nominal voltage: 6KV, 10KV, 35KV

★Frequency measurement

Measuring range: center frequency 50Hz, measuring conditions: signal fundamental wave component is not less than 80% F.S.

Measurement error: ≤0.02Hz

★Input voltage range: 185~285V

★Input current range: 5A, other ranges can be selected according to user requirements

★Fundamental wave voltage and current amplitude: allowable error of fundamental wave voltage≤0.5%F.S.; allowable error of fundamental wave current≤1%F.S.

★Measurement error of phase difference between fundamental voltage and current: ≤0.5°

★Measurement error of harmonic voltage content rate: ≤0.1%

★Measurement error of harmonic current content rate: ≤0.2%

★Three-phase voltage unbalance error: ≤0.2%

★Voltage deviation error: ≤0.2%

★Voltage variation error: ≤0.2%

★Power deviation: ≤5%

★Flicker error: ≤5%

★Voltage loop impedance: greater than 20kΩ

★Current loop impedance: less than 0.1Ω

★Secondary circuit withstand voltage: 2.5kV/1min

★Power consumption≤5W

★Insulation resistance: greater than 10MΩ under normal conditions, not less than 1MΩ under wet conditions.

★Implemented quality standards:

a.GB/T 19862-2005 General requirements for power quality monitoring equipment

b.GB/T 14549-1993 Power Quality Public Grid Harmonics

c.GB/T 12325-2008 power quality power supply voltage deviation

d.GB 12326-2008 Power Quality Voltage Fluctuation and Flicker

e.GB/T 15543-2008 power quality unbalanced three-phase voltage

f.GB/T 15945-2008 power quality power system frequency deviation

g.GB/T 18481-2001 Power Quality Temporary Overvoltage and Transient Overvoltage

h. Radiation electromagnetic field test: implement standard GB/T13926.3-92, severity level 3;

i.1MHz burst interference test: implement the standard GB/T6162-85;

j. The quality certification system passed by the enterprise: GB/T 19001-2000idt ISO9001: 2000; it has passed the relevant national industry certification.

The application fields of this device are mainly electric power system, users of industrial and mining enterprises, users of oil fields and coal mines, and places with serious power loss.

Claims (10)

1. A high-voltage power quality monitoring device, including a power parameter acquisition device (1) for real-time collection and upload of power grid data information, connected with the power parameter acquisition device (1), responsible for collecting terminal data collection, and completing storage and analysis of various data and the calculated electric energy parameter monitoring device (2) and the data transmission device (3) connected with the electric energy parameter monitoring device (2), the terminal of the data transmission device (3) is connected with the electric energy monitoring device (2) through a wireless signal, The electric energy monitoring device (2) is connected with the lower computer data receiving device (7) of the electric power dispatching center (8) through wired transfer, and it is characterized in that: The electric energy parameter acquisition device (1) includes an electric energy parameter acquisition operation device (11) and a current transformer (12) and a voltage transformer (13) connected thereto; the electric energy parameter monitoring device (2) has built-in data monitoring software; The data transmission device (3) transmits data through its communication interface (31). 2. The high voltage power quality monitoring device according to claim 1, characterized in that: the current transformer (12) is an open current transformer. 3. The high-voltage power quality monitoring device according to claim 2, characterized in that: it also includes a fuse (4) for short-circuit protection of the device; the fuse (4) is connected to the device through fuse protection. 4. The high-voltage power quality monitoring device according to claim 3, characterized in that: it also includes a lightning arrester (5); the lightning arrester (5) is connected in parallel with the fuse (4) and connected to the device. 5. The high-voltage power quality monitoring device according to claim 4, characterized in that: it also includes a stainless steel box (6), and the fuse (4) and lightning arrester (5) are placed outside the stainless steel box (6) . 6. The high-voltage power quality monitoring device according to any one of claims 1-5, characterized in that: the communication interface (31) is an RS-232 communication interface. 7. The high-voltage electric energy quality monitoring device according to claim 6, characterized in that: the electric energy parameter collection operation control device (11) is a digital electric energy parameter collection operation control device. 8. The high-voltage power quality monitoring device according to claim 7, characterized in that: the fuse (4) is a remote-controlled fully automatic dropout fuse. 9. The high-voltage power quality monitoring device according to claim 8, characterized in that: the arrester (5) is a reinforced zinc oxide arrester. 10. The high-voltage power quality monitoring device according to claim 9, characterized in that: the RS-232 communication interface is equipped with a GPRS remote power parameter transmission device to realize remote parameter transmission through a mobile network.

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