CN203800567U - Integrated protection apparatus for low-voltage distribution transformer area - Google Patents

Abstract

The utility model discloses an integrated protection apparatus for a low-voltage distribution transformer area, and the apparatus is used for protecting the transformer area. The apparatus comprises a case, a power connector board, a central processing and storage connector board, a monitoring and protection information input connector board, a control keyboard input connector board, a data liquid-crystal-display connector board, a GSM remote-transmission connector board, a communication unit connector board, and a tripping alarm connector board, wherein the power connector board, the central processing and storage connector board, the monitoring and protection information input connector board, the control keyboard input connector board, the data liquid-crystal-display connector board, the GSM remote-transmission connector board, the communication unit connector board and the tripping alarm connector board are plugged in the case. Each connector board is provided with a corresponding module unit circuit in a welding manner. A power module is connected with each module unit and supplies power to all the module units. The input end of a central processing and storage unit is connected with a monitoring and protection information input module and a control keyboard input module. The output end of the central processing and storage unit is connected with a data liquid crystal display module, a GSM remote-transmission module, and a tripping alarm unit. The apparatus provided by the utility model can be widely used in urban and rural low-voltage distribution networks, achieves the integrated protection for the important parts of the transformer area, and enhances the operation safety of a low-voltage power grid.

Description

Comprehensive protection device for low-voltage distribution transformer station area

technical field

The utility model relates to a protection device, in particular to a protection device for a transformer station area.

Background technique

Accelerating the construction of new rural electrification is an important measure to realize the integration of urban and rural areas. The electrification construction of the new countryside is carried out on the basis of the transformation of the rural power grid to meet the needs of the development of the new countryside. The low-voltage distribution station area is an important part of the new rural electrification construction, and its safety issues are directly related to the operation safety of the rural power grid. At present, the protection of the low-voltage distribution transformer station area still needs personnel inspections. The detection and protection of the operating conditions of the low-voltage distribution transformer station area, including whether there is overvoltage, overcurrent, whether the zero line is broken, and whether the three items are balanced, etc. Without unified equipment to achieve, the normal and stable operation of the low-voltage power grid cannot be guaranteed.

Utility model content

The technical problem to be solved by the utility model is to provide a comprehensive protection device for the low-voltage distribution transformer area, which can be widely used in urban and rural low-voltage power distribution networks, to provide unified protection for all key parts of the transformer area, and to enhance the safety of the low-voltage power grid operation sex.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

Comprehensive protection device for low-voltage distribution transformer station area, including casing and power plug-in board plugged into the casing, central processing and storage plug-in board, monitoring and protection information input plug-in board, control keyboard input plug-in board, and data LCD display plug-in Board, GSM remote transmission plug-in board, communication unit plug-in board and tripping alarm plug-in board, each plug-in board is welded with corresponding module unit circuit; among them: the power module is connected with the central processing and storage unit, monitoring protection information input module, control The keyboard input module, data LCD display module, GSM remote transmission module, communication unit and trip alarm unit are connected, and the input terminals of the central processing and storage unit are respectively connected with the monitoring information protection input module and the control keyboard input module; the central processing and storage unit The output terminals of the data LCD display module are respectively connected with the data LCD display module, the GSM remote transmission module and the trip alarm unit; the central processing and storage unit also communicate with the communication unit; the output terminals of the data LCD display module are connected and arranged on the front panel of the casing On the LCD screen, the GSM remote transmission module is also connected to the handheld terminal bound to it through the wireless network.

Owing to having adopted above-mentioned technical scheme, the technical progress that the utility model obtains is:

The utility model can be widely used in low-voltage power distribution networks in urban and rural areas, realizes unified protection of key parts in the transformer station area, and enhances the safety of the low-voltage power grid operation. The setting of the trip alarm unit can execute trip or alarm commands to protect the safety of low-voltage power grid operation when accidents such as overvoltage in the transformer station area, unbalanced three-phase voltage in the transformer station area, and undervoltage in the transformer station area occur; GSM remote The setting of the transmission module is used to send the fault information to the relevant staff in the form of sending a text message or making a phone call when there is a fault in each monitoring and protection quantity, so as to eliminate the fault as soon as possible.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a schematic diagram of wiring of each unit terminal of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

The comprehensive protection device for the low-voltage distribution transformer station area, its structure is shown in Figure 1, including the casing and the power plug-in board plugged into the casing, the central processing and storage plug-in board, the monitoring and protection information input plug-in board, and the control keyboard input Plug-in boards, data LCD display plug-in boards, GSM remote transmission plug-in boards, communication unit plug-in boards and trip alarm plug-in boards, each plug-in board is welded with a corresponding module unit circuit; the GSM remote transmission module is also connected to the The bound handheld terminal.

The output terminals of the power module are respectively connected with the central processing and storage unit, the monitoring and protection information input module, the control keyboard input module, the data liquid crystal display module, the GSM remote transmission module, the communication unit and the tripping alarm unit to provide power for them; The input terminals of the processing and storage unit are respectively connected with the monitoring information protection input module and the control keyboard input module; the output terminals of the central processing and storage unit are respectively connected with the data LCD display unit, the GSM remote transmission module and the trip alarm unit; the data LCD screen The output end of the display module is connected to the liquid crystal screen arranged on the front panel of the casing; the central processing and storage unit is also connected to the communication unit through communication.

The input end of the monitoring protection information input module is respectively connected to the voltage transformer, the current transformer and each sensor through cables. Among them, the voltage transformer is used to collect the system voltage value. The current transformer is used to collect the current value of each phase of the system. The sensors mainly include access control sensors, water immersion sensors, etc., which are installed in various monitoring parts of the low-voltage distribution transformer area. The access control sensors can be installed at the cabinet door of the transformer area to prevent electricity theft in the transformer area and detect Whether the cabinet door of the transformer station area is opened by mistake; the water immersion sensor is installed inside the transformer station area to detect whether there is any fault such as water immersion in the transformer station area.

The control keyboard input module is used to set and input the limit value of each protection value.

The central processing and storage unit stores various fixed values input by the control keyboard input module. When the central processing and storage unit receives the voltage value, current value and data signals of each sensor collected in the monitoring protection information input module, the It analyzes and judges, and draws the results, and then sends control instructions to the relevant unit modules. the

The data LCD display module is used to display the information collected by the monitoring and protection information input module and the calculation results of the central processing and storage unit, which is convenient for the staff to monitor the various operating states of the low-voltage distribution transformer area in real time.

The GSM remote transmission module is used to realize the transmission of signals, combined with the GSM short message platform, the GSM wireless network is used as the carrier for transmitting information to realize the transmission of signals. The network structure of GSM is flexible and convenient, and it can be set up in the substation. When the detection transformer area protection fails, the alarm signal is transmitted to the handheld terminal through the GSM wireless network, so that the staff can solve the problem as soon as possible.

The trip alarm unit includes a trip control module and an alarm indicator module. After processing and analyzing the information of each protection device in the central processing and storage unit, if an abnormal situation is found, according to the fault level, choose to execute the trip command or light the alarm indicator.

The communication unit is provided with an S485 interface or an RS232 interface, which is used to connect with the background monitoring center of the substation through a communication cable for data sharing.

The limit value of each monitoring quantity of the utility model can be set by controlling the keyboard input module, and similarly, the protection mode can also be preset by controlling the keyboard input module. The utility model is set into three types: the first protection function is "blocking", which means that the device does not have this protection function; the second protection function is "alarm", which means that the device judges When the fault occurs, the alarm output is closed and the indicator light is on. When all fault states disappear, the alarm output is disconnected; the third protection function is "tripping", which means that the device judges that the fault occurs according to the customization and delay of the protection. , the alarm indicator light is on, and the trip outlet is closed at the same time.

The liquid crystal screen of the utility model is installed on the front panel of the casing, and the wiring terminals of each module unit are arranged on the rear panel of the casing. There are 24 connection terminals respectively arranged on the two rows of terminal blocks, and the connection state of each terminal is shown in FIG. 2 .

The upper terminal block includes 24 terminals, and the wiring status of each terminal block is as follows: Terminals 1 to 4 on the upper terminal block are voltage sampling terminals, which can be directly connected to the three-phase voltage transformer on the low-voltage side of the distribution transformer for voltage monitoring. Sampling; terminals No. 6 to No. 13 on the upper terminal block are current sampling terminals, which are respectively connected to the three-phase CT and neutral line CT output on the low-voltage side of the distribution transformer; No. 16 to No. 22 terminals on the upper terminal block are external communication terminals, which can be selected RS485 interface or RS232 interface, communicate with the communication unit; terminals 23 and 24 on the upper terminal block are the output interfaces of the 12V power supply.

The lower terminal block also includes 24 terminals, and the wiring status of each terminal block is as follows: No. 2 to No. 5 terminals of the lower terminal block are set as digital input, the limited voltage is 220V, and the input digital value can be set as normally open point input or Normally closed point input, if the normally open point input is selected, the normal state is the disconnected state, and the closed state is the valid state. If the normally closed point input is selected, the normal state is the closed state, and the disconnected state is the valid state; No. 6 to 9 of the lower terminal block The terminals are respectively connected to external signal acquisition sensors, including access control sensors, water immersion sensors, etc.; terminals No. 11 to No. 18 of the lower terminal block are connected to the control output circuit, and terminals No. 15 and No. 16 of the lower terminal block are connected to the tripping control circuit , No. 15 terminal is connected to the contactor coil, with electric tripping function, No. 16 terminal is connected to any one of the three phases A, B, C; No. 17 and No. 18 terminals of the lower terminal block are connected to the alarm control circuit, and No. 17 terminal is connected to Any one of the three phases A, B, and C, the No. 18 terminal is connected to the alarm light.

After the device is started, the control keyboard input module can set the device to display the operating data of the system in a cycle of 3 seconds, set the parameters according to the safety requirements of the low-voltage power grid operation, and set the action threshold value of each protection function as As follows: the overvoltage threshold is set to 260V, the undervoltage threshold is set to 160V, the voltage difference threshold is set to 30V, the overload threshold is set to 200A, the leakage current threshold is set to 10A, and the oil temperature threshold is set to 80°C. The upper limit of each protection threshold is set as follows: the overvoltage threshold is 260V, the undervoltage threshold is 220V, the voltage difference threshold is 60V, the overload threshold is 5000A, the leakage current threshold is 1000A, and the oil temperature threshold is 200°C.

The utility model can realize the disconnection of the zero line of the transformer station area, the overcurrent of the transformer station area, the overvoltage of the transformer station area, the three-phase unbalance of the voltage of the transformer station area, the voltage undervoltage of the transformer station area, and the disconnection of the zero line of the transformer station area according to the preset parameter requirements. Overload, oil temperature in the transformer station area, whether there is electricity stealing in the transformer station area, whether the cabinet door of the transformer station area is opened by mistake, and whether the transformer station area is flooded, etc.

Claims (1)

1. low voltage distribution transformer platform district comprehensive protector, it is characterized in that: comprise casing and be plugged on power insert plate, central authorities' processing and memory card plate, monitoring and protecting input information card, supervisory keyboard input card, data liquid crystal display screen demonstration card, GSM remote transmission card, communication unit card and the tripping alarm card in casing, on each card, be welded with respectively corresponding modular unit circuit; Wherein: power module is connected with central authorities' processing and memory cell, monitoring and protecting MIM message input module, supervisory keyboard input module, data liquid crystal display screen display module, GSM remote transmission module, communication unit and tripping alarm unit respectively, the input of central authorities' processing and memory cell is connected with monitoring information protection input module and supervisory keyboard input module respectively; Central authorities process and the output of memory cell is connected with data liquid crystal display screen display module, GSM remote transmission module and tripping alarm unit respectively; Central authorities process and memory cell also intercoms mutually with communication unit; The output of described data liquid crystal display screen display module connects the liquid crystal display screen being arranged on casing front panel, and GSM remote transmission module also connects the handheld terminal of binding with it by wireless network.