CN202308870U - Intelligent high-low voltage preassembly box type transformer substation - Google Patents

Abstract

The utility model discloses an intelligent high and low voltage prepacked box-type substation, which aims at realizing remote control, remote signaling, remote measurement, remote adjustment, remote viewing power distribution management and seamless connection automatic compensation of reactive power through the control technology of an intelligent controller , No switching oscillation, no inrush current, no compensation dead zone. It includes: a concrete box (1), which has a 10kV ring network power supply device (2), and the ring network power supply device is connected to a transformer device (3), a low-voltage power distribution device (4), and a reactive power compensation device (5) in sequence. ), remote meter reading device (6), each device is connected to the intelligent controller (8) through the communication interface (7), and the wireless data transmission terminal (9) of the intelligent controller corresponds to the main station computer ( 11) The wireless data transmission terminal (12), the reactive power compensation device includes a variable impedance transformer (14) controlled by an anti-parallel thyristor (13), and the variable impedance transformer is respectively connected to a circuit breaker (15), a vacuum contactor (16), a suppressor The inrush inductor (17) is connected to the compensating capacitor bank (18) to suppress the inrush inductor. This product is used for the construction of substations.

Description

An intelligent high and low voltage prepackaged substation

technical field

The utility model relates to an intelligent high and low voltage prepackaged box-type substation. the

Background technique

At present, the development and application of box-changing technology has reached a penetration rate of over 90% in European and American countries, but only about 10% in my country. Especially in terms of box-type intelligent technology, there is a big gap compared with foreign countries, and domestic research on related technologies is in its infancy. Especially in the wide-area urban power transmission and distribution network system, traditional civil substations and indoor and outdoor transformer kiosks (sets) are still used. Even if a few box-type substations are used, most of the box-type substations are still metal boxes. Corrosion, condensation, aging, environmental pollution, difficult maintenance, high cost of civil engineering, operation, and maintenance, low level of automation, etc. have many disadvantages, and the power supply cable of the ring network adopts the connection mode of high-voltage overhead line. the

The low-voltage reactive power compensation of the existing substation adopts the conventional mechanical switch switching capacitor bank switch. When the gate is included, the contact bounces easily to generate overvoltage and action delay to generate inrush current. Static pressure equalization is not suitable for compensating the shortcomings of loads with rapid reactive power changes. the

Utility model content

The purpose of this utility model is to provide an intelligent high and low voltage prepacked box-type substation, through the control of the connected intelligent controller to realize automatic reactive power compensation and remote automatic meter reading, and adopts reactive power based on low-voltage non-inrush switching switch compensation device. the

Above-mentioned purpose realizes by following technical scheme:

An intelligent high and low voltage prepackaged box-type substation, which consists of: a concrete box, the concrete box has a 10kV ring network power supply device, and the 10kV ring network power supply device is sequentially connected to a transformer device and a low-voltage power distribution device , reactive power compensation device, remote meter reading device, each of the above devices is connected to the intelligent controller through the communication interface, and the wireless data transmission terminal of the intelligent controller corresponds to the wireless data transmission terminal of the main station computer through the wireless antenna tower , the reactive power compensation device includes a variable impedance transformer controlled by an anti-parallel thyristor, and the variable impedance transformer is respectively connected to a circuit breaker, a vacuum contactor, and an inrush suppression inductance, and the inrush current suppression inductance is connected to a compensating capacitor bank. the

The beneficial effects of the utility model:

1. Through the control technology of the intelligent controller, the utility model realizes remote control, remote signaling, remote measurement, remote adjustment, remote viewing power distribution management and seamless connection of reactive power automatic compensation, no switching oscillation, no inrush current, no compensation dead zone . Reactive power compensation can dynamically track low-voltage changing loads, and realize low-voltage reactive power three-phase capacitor co-compensation, single-phase capacitor separate compensation, and single-phase and three-phase capacitor mixed compensation. Capacitor switching adopts the latest design of the company's stepped non-inrush current power capacitor switching device. The switching device is triggered by the zero-crossing voltage of the bidirectional thyristor to input the capacitor, and there is no surge current when it is input, and then it is transferred to the power capacitor contactor to run. The bidirectional thyristor current is cut off at zero crossing, and no high voltage is generated when the capacitor is disconnected. Therefore, there is no inrush current, no high voltage, and no heat during operation when the capacitor is switched on or off. The design life of the contactor is 600,000 times, so it has a long life, fewer failures, and stable and reliable operation. During normal operation, the circuit breaker DL is closed at first, and the anti-parallel thyristor is turned on at the system voltage zero crossing point TH, so that the primary of the TB variable impedance transformer quickly presents an extremely low impedance and connects to the main circuit. After a period of delay, the vacuum contactor closes. The on-resistance of the vacuum contactor is extremely small, so the current is transferred from the transformer circuit to the vacuum contactor circuit, and then the thyristor trigger pulse is canceled after a period of delay. The thyristor switch trigger phase is controllable, and no inrush current can be realized. When it is turned on, it presents extremely low impedance, so the vacuum contactor can be closed at low voltage, which reduces the electrical stress of the mechanical switch and protects the switch. After the mechanical switch is closed, the thyristor is disconnected so that the transformer is equivalent to the excitation impedance, and the transformer branch is cut off. When the circuit is in steady state, the circuit is connected by a vacuum contactor with a small on-resistance, thereby reducing the loss of the system. . When opening the gate, the vacuum contactor acts first, and the thyristor is also connected at the same time, the current of the vacuum contactor is transferred to the transformer, and then the trigger pulse of the thyristor is removed. The commutation circuit makes the vacuum contactor open under low current, greatly reduces the arcing time, realizes arc-free breaking of the vacuum contactor, and improves the service life of the vacuum contactor. Its main features are: controllable closing phase, no impact, no inrush input, low on-resistance, low power consumption, low current opening to reduce arcing time, and avoid switch restart; low voltage closing, low current Opening, reducing the electrical stress of the vacuum contactor and improving the service life of the switch; the response speed is fast and the dynamic response time is short, which can be used to compensate the reactive load that changes quickly; because the transformer adopts a short-term overload operation method, The capacity is significantly reduced, the price is low, and the cost performance is high. the

2. The concrete box used is resistant to magnitude 8 earthquake, no condensation, no rust, no weathering, no potential threat to the environment, and a service life of one hundred years. And the surface of the cabinet can be decorated according to the needs of users. The surface of the cabinet is sprayed with natural real stone, which is integrated with the surrounding buildings. It is anti-scouring, anti-weathering, durable and durable. According to the requirements of power supply users, two structures of "目" and "品" can be used in the box structure layout. the

3. Master station computer system: The intelligent controller collects real-time data and status information on site, uploads them to the real-time database system of the power distribution monitoring center through the GPRS.M2M wireless data transmission terminal, analyzes and compares the fault discrimination algorithm, and obtains instant analysis results. In this way, telemetry, remote signaling, remote fault diagnosis, and automatic location of faulty sections are completed for power distribution terminal equipment. It provides an efficient and reliable distribution automation overall solution for power distribution enterprises to realize real-time data integration, monitoring, coordination and operation of power distribution equipment in normal operation and accident status in remote places. When this product is connected into a "hand-in-hand" power supply ring network, it can complete automatic location of faulty sections, fault removal, load transfer, and network topology reconstruction, so that healthy areas can quickly restore power supply. the

4. In the intelligent high and low voltage prepackaged substation, the medium voltage (12kV) can meet the requirements of distribution network automation, and the low voltage (0.4kV) can meet the requirements of intelligent residential property management. It is suitable for urban public power distribution, high-rise buildings, residential quarters, industrial and mining enterprises, ports, Shantian, parks, expressways and large construction sites with a rated voltage of 12/0.4kV ring network or radial terminal and a capacity of 800kVA or below. Power transmission, reception and distribution of electric energy, power and lighting power supply. the

Description of drawings

Accompanying drawing 1 is the structural representation of this product. the

Accompanying drawing 2 is the circuit schematic diagram of reactive power compensation device. the

Detailed ways

The utility model will be described in further detail below according to the accompanying drawings and embodiments. the

Example 1:

The intelligent high and low voltage prepackaged box-type substation consists of: a concrete box 1, the concrete box has a 10kV ring network power supply device 2, and the 10kV ring network power supply device is connected to the transformer device 3 in turn, and the low-voltage power distribution Device 4, reactive power compensation device 5, remote meter reading device 6, each of the above devices is connected to the intelligent controller 8 through the communication interface 7, and the wireless data transmission terminal 9 of the intelligent controller corresponds to the wireless antenna tower 10 The wireless data transmission terminal 12 of the main station computer 11, the described reactive power compensation device comprises the anti-parallel thyristor 13 controlled variable impedance transformer 14. The described variable impedance transformer is respectively connected to a circuit breaker 15, a vacuum contactor 16, and an inrush current suppressing inductance 17. The inrush suppression inductance is connected to the compensating capacitor bank 18. the

The high-voltage arc extinguishing and insulation of the circuit breaker of the 10kV ring network power supply device adopts the SF6 magnetic swirling arc mechanism. When the moving contacts are separated, an arc is generated, and then the arc root of the arc is transferred to the metal inner core inside the arc extinguishing coil Above, the arc current passes through the arc extinguishing coil to generate a magnetic field and the arc generates a LORENZ force, driving the arc root to rotate around the inner core of the coil at a high speed, so that the arc is cooled and continuously in contact with fresh SF6 gas, and extinguished when the current crosses zero , to achieve the purpose of arc extinguishing and insulation. the

Under the control of the intelligent controller, the whole substation realizes 7*24 power distribution control center through the GPRS. Hour wireless real-time data transmission and communication. The 10kV ring network power supply cable connection changes the previous high-voltage overhead line access method, and adopts the 10kV high-voltage underground cable urban ring network power supply method. The 10kV high-voltage cable incoming line is connected to the high-voltage terminal of the gas box at the beginning of the 10kV ring network through an epoxy resin sleeve; each sleeve has passed the partial discharge test with a maximum discharge value of TE≤2PC: for safety reasons, each Airboxes are fitted with internal overpressure relief devices. The 10kV ring network power supply high-voltage chamber adopts the GA2K1TS ring network switch (3-way incoming line, 3-way outgoing line, and 3-way ring line) power supply mode; 200V/380V is transmitted to the low-voltage power distribution system through the secondary low-voltage output terminal, and the low-voltage power distribution equipment is divided into 3-6 output power supplies according to a certain wiring scheme. the

Claims (1)

1. An intelligent high and low voltage prepackaged box-type substation, which consists of: a concrete box, characterized in that: the concrete box has a 10kV ring network power supply device, and the 10kV ring network power supply device is sequentially connected to the transformer device, low-voltage power distribution device, reactive power compensation device, remote meter reading device, the above devices are connected to the intelligent controller through the communication interface, and the wireless data transmission terminal of the intelligent controller corresponds to the main station through the wireless antenna tower The wireless data transmission terminal of a computer, the reactive power compensation device includes a variable impedance transformer controlled by an anti-parallel thyristor, and the variable impedance transformer is respectively connected to a circuit breaker, a vacuum contactor, and an inrush suppression inductor, and the inrush current suppression inductor is connected to Compensation capacitor bank. the

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