CN2938505Y - Intelligent reactive power compensation distribution box - Google Patents

Abstract

The utility model relates to a power supply and distribution and reactive power compensation device with the functions of low-voltage measurement, measurement and control, power distribution, and intelligent reactive power compensation. The current transformer is connected to the outlet switch and the inlet terminal of the smart capacitor respectively, the outlet terminal of the outlet switch is connected to the user, the signal sensed by the current transformer is connected to the signal input terminal of the comprehensive detector, and the communication interface of the comprehensive detector is connected to the smart capacitor. The communication interface is connected, and the data detected by the comprehensive detector is sent to the monitoring system in the form of a short message through GPRS.

Description

Intelligent reactive power compensation distribution box

Technical field:

The utility model relates to a power supply and distribution and reactive power compensation device with the functions of low-voltage measurement, measurement and control, power distribution, intelligent reactive power compensation, etc., and belongs to the field of reactive power compensation distribution box manufacturing.

Background technique:

The patent number of the applicant is ZL200420048053.2, and the name is "Metering Switch Compensation Box". It is connected in parallel with the incoming line end of the outgoing line assembly (2), the metering assembly (1) is composed of a transformer, a watt-hour meter and a junction box, the outgoing line assembly (2) is composed of a knife fuse switch, and the compensation assembly (3) It consists of circuit breaker, contactor, capacitor, self-compensator, load monitor and lightning arrester. Its shortcomings: First, the structure is composed of a distribution transformer integrated measurement and control device and multiple low-voltage power capacitors, AC contactors and other protection devices in bulk in an outdoor equipment box; second, the function is integrated by a distribution transformer The measurement and control device and several intelligent capacitors are assembled by building blocks in the outdoor equipment box; the third is that the product structure is relatively complex, the volume is large, and it is difficult to standardize and normalize; the fourth is that once the product is formed, its configuration adjustment and reactive power compensation The optimization of capacity is very difficult; fifth, there are many devices, many contacts, long wires, and high energy consumption; sixth, the comprehensive measurement and control device of distribution transformer is the bottleneck of the reliability of the whole machine. Once the measurement and control device fails, the whole machine will fail; seventh, the overall The technology is difficult, and the fault diagnosis and on-site processing are both difficult and time-consuming; eighth, the product is a holistic device, which needs to be configured in the future and requires a one-time investment.

Invention content:

Design purpose: To avoid the deficiencies in the background technology, to design an intelligent reactive power compensation distribution box with functions such as low-voltage measurement, measurement and control, power distribution, and intelligent reactive power compensation.

Design scheme: In order to achieve the above design purpose. The intelligent reactive power compensation distribution box is a series of integrated measurement and control devices for power distribution and a series of intelligent low-voltage power capacitors developed by our company. This product is a new generation of power supply and distribution and reactive power compensation device with high technical content and high cost performance, which combines functions such as low-voltage metering, measurement and control, power distribution, and intelligent reactive power compensation in different ways according to different needs. It is composed of isolating switch, circuit breaker, power distribution comprehensive measurement and control device (optional) and intelligent low-voltage power capacitor. It is mainly installed under public transformers with a capacity of 30KVA-500KVA in cities and towns to measure, receive, feed and adjust line power factor, reduce reactive current, reduce power loss, improve power quality, and give full play to the potential of transformers to enhance power output. ability. This product can work uninterrupted and reliable for a long time in harsh environments with large ambient temperature changes and severe electromagnetic interference.

The intelligent reactive power compensation distribution box is mainly used for parameter collection, analysis, statistics, storage, reactive power intelligent automatic compensation, remote communication, control, and electric energy reception and distribution in the low-voltage distribution station area, and has a variety of communication interfaces , using GPRS or other channels to realize low-voltage power distribution management automation and reactive power optimization control. Users can implement low-voltage power distribution monitoring and reactive power compensation projects in stages according to conditions, and reactive power compensation can also be adjusted according to operating parameters after commissioning to optimize the configuration of power distribution monitoring and reactive power compensation. The loading and unloading of intelligent low-voltage power capacitors and power distribution integrated measurement and control devices are all plug-in, which is very convenient for assembly or replacement, and can be configured and adjusted at the use site or replaced after failure. Its technical solution: an intelligent reactive power compensation distribution box, which includes a box body and a metering assembly, and the three-phase power main line on the incoming line switch (1) respectively passes through the current transformer (2) and the outgoing line switch (5) respectively. It is connected to the incoming line terminal of the smart capacitor (3), the outgoing line terminal of the outgoing line switch (5) is connected to the user, and the signal sensed by the current transformer (2) is connected to the signal input terminal of the comprehensive detector (4), and the comprehensive detector (4) The communication interface of the intelligent capacitor (3) is connected with the communication interface of the smart capacitor (3), and the data detected by the comprehensive detector (4) is sent to the monitoring system in the form of a short message through GPRS.

Compared with the background technology, the utility model is firstly composed of a distribution transformer comprehensive measurement and control device and several intelligent capacitors assembled in the outdoor equipment box; The combination of voltage and power capacitors, smart capacitors have over-temperature (reflecting the influence of factors such as working voltage, ambient temperature, power harmonics and leakage current on capacitors) and over-current, phase failure, and three-phase unbalance protection. Once the measurement and control device fails, the intelligent low-voltage power capacitor can work as a self-contained system, and can still realize the basic function of low-voltage reactive power automatic compensation, and realize the fault self-diagnosis function of controllers, capacitors, switching appliances and other components; the third is The product structure is simple, the volume is small, and the capacity is standardized and normalized; the fourth is that it can be flexibly configured according to the situation and the change of the situation. For example, it is possible to only configure the distribution transformer comprehensive measurement and control device for distribution transformer monitoring, and then configure intelligent capacitors according to needs in the future; it is possible to configure only intelligent capacitors to realize basic low-voltage reactive power automatic compensation, and to add distribution transformer integration in the future as needed Measurement and control device; the intelligent capacitor can be adjusted on site to achieve the optimal configuration of reactive power compensation; fifth, there are fewer devices, fewer contacts, short wires, and low energy consumption; The system works to realize the low-voltage reactive power automatic compensation function, and some intelligent capacitors will automatically exit after failure, without affecting the rest of the work. The intelligent low-voltage power capacitor can achieve the reliability of switching 1 million times. The operating temperature inside the box is low, and the operating reliability is high; Seventh, the fault self-diagnosis function is strong, and on-site fault finding is easy; the main components are fully pluggable, easy to replace, assemble and disassemble; The allocation of economic capacity can be gradually increased in the future to realize investment in batches. The equipment with the same capacity is much smaller than the conventional type; Ninthly, the product wire loss, contact loss and device loss are greatly reduced, which reduces the energy consumption of the equipment itself, and at the same time reduces the operating temperature in the box and improves the operating reliability. And it has the advantages of simple wiring, compact and simple structure, strong completeness, small footprint, simple installation, safe and reliable operation, and easy operation and maintenance.

Description of drawings:

Figure 1 is a schematic diagram of the front view of the intelligent reactive power compensation distribution box.

Figure 2 is a schematic diagram of the wiring structure of the intelligent reactive power compensation distribution box.

Detailed ways:

Embodiment 1: with reference to accompanying drawing 1～3. The intelligent reactive power compensation distribution box includes a box body and a metering assembly. The main line of the three-phase power supply on the incoming line switch 1 passes through the current transformer 2 and is respectively connected to the outgoing line switch 5 and the incoming line end of the smart capacitor 3. Line switch 1 neutral line is connected to the zero line terminal of the comprehensive detector. The outlet terminal of the outlet switch 5 is connected to the user, and the signal sensed by the current transformer 2 is connected to the signal input terminal of the comprehensive detector 4, and the comprehensive detector 4 is provided with GPRS. The communication interface of the comprehensive detector 4 is connected with the communication interface of the smart capacitor 3, and the data detected by the comprehensive detector 4 is sent to the monitoring system in the form of a short message through GPRS, or the comprehensive detector 4 is provided with an infrared data communication interface or bluetooth data Communication Interface. Intelligent capacitors are equipped with over-temperature, over-current, phase failure, and three-phase unbalanced protection circuits. The loading and unloading of intelligent capacitors and power distribution integrated measurement and control devices (detectors) are all plug-in structures. The smart capacitor (3) is provided with a single-phase capacitor and a three-phase capacitor.

This application is equipped with overvoltage, undervoltage, loss of voltage, overcurrent, phase failure, three-phase unbalance, overtemperature protection (including overheat caused by overharmonic and leakage current can reflect), and can realize from the control The complete self-diagnosis function of the device, switchgear and intelligent low-voltage power capacitor is convenient for the user to inspect the operation and find and deal with the equipment failure by himself. The intelligent low-voltage power capacitor can reflect the over-temperature situation caused by its working over-voltage, over-harmonic, environmental over-temperature and its own leakage current, etc., and the intelligent low-voltage power capacitor has the function of zero switching (that is, the voltage zero-crossing capacitor switching, the current Zero capacitor cutting), the zero switching function can reduce the impact on the power grid and the capacitor itself, and improve the rapidity of control. The product's zero switching function and setting over-temperature protection can effectively prolong the service life of intelligent low-voltage power capacitors. Reach 1 million times of reliable switching.

This application adopts the combination of intelligent low-voltage electrical appliances, power distribution comprehensive measurement and control device and outdoor equipment box. In the case of both intelligent low-voltage power capacitors and power distribution comprehensive measurement and control devices, the functions of the two are integrated through bus communication. as one. Control: open and close control of incoming total power supply; open and close control of outgoing line load and reactive power compensation switching control. Protection: overload, short circuit, lightning protection, current transformer secondary open circuit protection, rainwater and grounding protection. Signal: intelligent low-voltage power capacitor switching, cutting signal, fault alarm signal. The power distribution integrated measurement and control device adopts a highly intelligent multifunctional voltage and reactive power integrated controller and a power distribution quality monitoring device, which can monitor the power distribution quality in real time. When used in conjunction with TDS series intelligent low-voltage power capacitors, it can The voltage and reactive power are optimally optimized, and the communication mode can be used to form the system work, which can simplify the connection line and improve the reliability. The device can be networked with other distribution transformers, electrical equipment and similar equipment to realize centralized management and automation of distribution transformers, compensation, and electrical operation. The control operation modes of the controller include automatic and manual. There is an automatic and manual compensation switching switch on the intelligent low-voltage power capacitor. In the case of configuring the power distribution comprehensive measurement and control device, in order to accept the control mode, execute the control command of the power distribution comprehensive measurement and control device. In the absence of a power distribution integrated measurement and control device or a power distribution comprehensive device failure, it will be switched on and off automatically according to the reactive power deficit. In the case of multiple intelligent low-voltage power capacitors used together, the intelligent low-voltage power capacitors can automatically identify and generate a master, and the rest are slaves, forming a low-voltage reactive power automatic control system to work. When individual slaves fail, they automatically exit without affecting the rest of the work; if the master fails and automatically exits, a new master is automatically generated among the rest of the slaves to form a new automatic control system to work, and the switching appliances realize zero-voltage conduction. On and off with zero current for fast reactive power compensation. Measurement: CT phase and transformation ratio automatic measurement and correction, measurement parameters include: distribution voltage, current, reactive power, efficiency factor, capacitor three-phase current and body surface temperature. Protection: power distribution overvoltage, undervoltage, loss of voltage protection. Capacitor overcurrent, three-phase unbalance, phase failure, capacitor body overtemperature protection (including overheat caused by overharmonic and leakage current can be reflected). Communication: RS----485/RS----232 online interface, MODEMBUS online protocol software. Human-machine connection: LCD screen, indicator light and keyboard on the device, and infrared meter reading device on the device.

It should be understood that: although the above-mentioned embodiments have described the utility model in more detail, these explanations are only illustrative of the utility model, rather than limiting the utility model, and any invention that does not exceed the essence of the utility model Creations all fall within the protection scope of the present utility model.

Claims (7)

1, a kind of intellectual reactive power compensation distribution box, it comprises casing and metering assembly, it is characterized in that: the three phase mains main line on the service entrance switch (1) pass respectively current transformer (2) respectively with go out wiretap (5) and be connected with intelligent capacitor (3) end of incoming cables, go out the outlet termination user of wiretap (5), the signal that current transformer (2) is sensed connects the signal input part of comprehensive detector (4), the communication interface of comprehensive detector (4) is connected with the communication interface of intelligent capacitor (3), and the detected data of comprehensive detector (4) are sent to supervisory control system by GPRS in the mode of short message.

2, intellectual reactive power compensation distribution box according to claim 1, it is characterized in that: comprehensive detector is provided with GPRS in (4).

3, intellectual reactive power compensation distribution box according to claim 2, it is characterized in that: comprehensive detector (4) is provided with infrared data communication interface or bluetooth data communication interface.

4, intellectual reactive power compensation distribution box according to claim 1 is characterized in that: service entrance switch (1) zero line connects comprehensive detector zero line terminals.

5, intellectual reactive power compensation distribution box according to claim 1, it is characterized in that: intellectual capacitor (3) is provided with excess temperature, overcurrent, the phase failure, three-phase imbalance protective circuit.

6, intellectual reactive power compensation distribution box according to claim 1 is characterized in that: the loading and unloading of intellectual capacitor (3) and comprehensive power distribution detector (4) are the pulling and inserting type structure entirely.

7, intellectual reactive power compensation distribution box according to claim 1, it is characterized in that: intellectual capacitor (3) is provided with single-phase electricity container and three-phase capacitor.

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