CN207069679U - Direct current emergency power system for transformer station - Google Patents

Abstract

The utility model discloses the direct current emergency power system for transformer station, including being provided with battery pack on dc source charger, in electric network fault, after the AC power of emergency system input is lost, the battery pack is powered to system, and the battery pack is powered to system, and carries out showing that the dc source charger matches one by one with battery pack over the display, when power-supply system incoming transport power supply, dc source fills device and charged by battery pack.Emergency system carries out rectification after incoming transport electricity by rectifier; sent data to while rectification by 485 communication interfaces in monitoring unit; one output end of the DC current after rectification is connected with discharge prevention; dc source output is carried out after discharge prevention; another output end is connected after diode is accessed with charge protection; two output ends form a loop, are provided with battery pack on the loop, the battery pack is charged to dc source charger.

Description

DC Emergency Power System for Substation

technical field

The utility model relates to an emergency power supply system, in particular to a DC emergency power supply system used in a substation.

Background technique

The DC power supply system of the substation provides DC and emergency power for the substation equipment. Substations of 110kV and below in the power system are basically equipped with a single battery pack. When the capacity of the battery pack declines, individual batteries fail internally, and nuclear capacity tests are required, if there is no temporary battery pack to support the DC system, once the AC is interrupted, the entire station will be damaged. Serious consequences of DC bus power loss.

There are currently two kinds of DC emergency power supply systems in China. One is to use traditional lead-acid batteries as the DC emergency power supply system, which has problems such as large volume, heavy equipment, short life, long charging time, inconvenient transportation, and delayed repair time; the other is the substation of proton exchange membrane fuel cells Emergency power system, but based on factors such as fuel cell technology maturity, operation and maintenance, it is difficult to apply it in the power system. In addition to the above two systems, the others are basically UPS, EPS power supply and lighting emergency power supply, which cannot yet be used as a DC power supply emergency system for power system substations.

To sum up, the site urgently needs a portable DC emergency power system that is convenient for transportation and transition, as an emergency DC power supply for substations.

Utility model content

The technical problem to be solved by the utility model is that when the capacity of the storage battery equipped in the substation declines, the internal failure of individual batteries and the nuclear capacity test need to be performed, an emergency power supply system is required as an emergency for the DC power supply of the substation, and the purpose is to provide a power supply system for the substation. The DC emergency power supply system solves the above problems.

The utility model is realized through the following technical solutions:

The DC emergency power supply system used in substations includes a battery pack installed on the DC power charger. When the power grid fails and the AC power input by the emergency system is lost, the battery pack supplies power to the system, and the battery pack supplies power to the system. The power supply also includes a monitoring unit, the monitoring unit monitors the data of the entire system, and displays on the display. The DC power charger matches the battery pack one by one. When the power system is connected to the AC power, the DC power will charge The charger is charged by the battery pack.

After the emergency system is connected to the AC power, it rectifies through the rectifier, and sends the data to the monitoring unit through the 485 communication interface while rectifying. One output terminal of the rectified DC current is connected to the discharge protection, and the DC power output is performed after the discharge protection. The other output end is connected to the charging protection after being connected with a diode, and the two output ends form a loop, and a battery pack is arranged on the loop, and the battery pack is charged to a DC power charger. The circuit formed by the two output terminals is also equipped with a charging protection module, which includes a diode and a normally closed contact. The normally closed contact is set for normal charging. After the battery pack is fully charged, the normally closed contact is triggered to disconnect. Current is transmitted through the diode. The alternating current is 110kv. Substations of 110kV and below in the power system are basically equipped with a single set of batteries. When the capacity of the battery set declines, an internal failure of a few batteries is required, and a nuclear capacity test is required, if there is no temporary battery set to support the DC system, once the AC is interrupted, the entire station will cause DC. The serious consequences of bus power failure, after the AC power is lost, the battery pack is used to maintain the basic system operation. At this time, when other AC power is connected, the system’s built-in rectifier can output stable DC power to ensure DC in the station. The power supply is safe and reliable.

Further, the battery pack selects a lithium battery to provide power for the emergency power system. The lithium battery material includes lithium cobalt oxide, nickel cobalt manganese, lithium manganese oxide, lithium ferrous phosphate, and lithium iron. The lithium battery using the above materials can ensure that the battery pack can output stably when supplying power.

Further, the monitoring unit collects the information of the battery pack in real time and sets a threshold, and when the collected data exceeds the threshold, an early warning is displayed on the display. Through the analysis of the discharge characteristics and cycle life of lithium batteries with different capacities, different threshold parameters of each lithium battery can be obtained, and this parameter is set in the monitoring unit. The information collected by the monitoring unit includes charging and discharging. , current, voltage, short circuit, reverse charging and temperature information, compared with the threshold set in the monitoring unit, if the information exceeds the threshold, the display will give a warning, so that real-time monitoring can be realized, so that the staff can judge from the display of the display Whether the system is malfunctioning.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. The utility model is used in the DC emergency power supply system of the substation, and is used as a DC emergency power supply. When the DC system of the substation fails, the system is placed next to the DC power supply equipment of the substation as a whole, connected to the AC power supply, and the emergency system is started to operate for the DC load of the substation to ensure the safety and reliability of the DC power supply in the substation.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the utility model, constitute a part of the application, and do not constitute a limitation to the embodiments of the utility model. In the attached picture:

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the electrical wiring diagram of the utility model.

Marks and corresponding parts names in the attached drawings:

1-DC power charger, 2-battery pack, 3-monitoring unit, 4-display.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the examples and accompanying drawings. The schematic implementation of the utility model and its description are only used to explain the utility model Novelty, not as a limitation to the utility model.

Embodiment one

As shown in Figures 1-2, the utility model is used in a DC emergency power supply system of a substation, including a battery pack 2 arranged on a DC power charger 1. When the power grid fails, after the AC power input by the emergency system is lost, the battery The group 2 supplies power to the system, and also includes a monitoring unit 3, the monitoring unit 3 monitors the data of the entire system and displays it on the display 4, and the DC power charger 1 is matched with the battery pack 2 one by one. When the power system is connected to an AC power source, the DC power charger 1 charges through the battery pack 2 .

After the emergency system is connected to the AC power, rectification is carried out through the rectifier, and the data is sent to the monitoring unit 3 through the 485 communication interface during the rectification. One output terminal of the rectified DC current is connected to the discharge protection, and the DC power output is performed after the discharge protection , the other output terminal is connected to the charging protection after being connected to a diode, and the two output terminals form a loop, and a battery pack 2 is arranged on the loop, and the battery pack 2 charges the DC power charger 1 . The circuit formed by the two output terminals is also equipped with a charging protection module, which includes a diode and a normally closed contact, and the normally closed contact is set for normal charging. After the charging of the battery pack 2 is completed, the normally closed contact triggers disconnection , the current is transmitted through the diode. The alternating current is 110kv. Substations of 110kV and below in the power system are basically equipped with a single set of batteries. When the capacity of the battery set declines, an internal failure of a few batteries is required, and a nuclear capacity test is required, if there is no temporary battery set to support the DC system, once the AC is interrupted, the entire station will cause DC. The serious consequences of bus power failure, after the AC power is lost, the battery pack is used to maintain the basic system operation. At this time, when other AC power is connected, the system’s built-in rectifier can output stable DC power to ensure DC in the station. The power supply is safe and reliable.

The battery pack 2 selects a lithium battery to provide power for the emergency power system, and the lithium battery material includes lithium cobalt oxide, nickel cobalt manganese, lithium manganate, lithium ferrous phosphate, and lithium iron. The lithium battery using the above materials can ensure that the battery pack can output stably when supplying power. The preferred lithium battery of the utility model is iron lithium, because iron lithium is particularly suitable for power applications due to its performance, and iron lithium has a good cycle life than other lithium batteries. After 500 cycles, its discharge capacity is still greater than 95%. , there is no safety problem when discharged to zero volts, and the technology of lithium iron phosphate lithium ion battery in my country is very mature, the price is low, and it is easy to decompose, and the pollution to the environment is small. Based on the above conditions, iron lithium is preferred as the utility model. lithium battery power source.

The monitoring unit 3 collects the information of the battery pack 2 in real time, and sets a threshold. When the collected data exceeds the threshold, an early warning is displayed on the display 4 . The battery pack 2 information collected by the monitoring unit 3 includes charging, discharging, current, voltage, short circuit, reverse charging and temperature information.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. Within the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (7)

1. A DC emergency power supply system for substations, including a DC power charger (1) equipped with a battery pack (2). When the power grid fails, after the AC power input by the emergency system is lost, the battery pack (2) will The power supply of the system is characterized in that it also includes a monitoring unit (3), the monitoring unit (3) monitors the data of the entire system and displays it on the display (4), and the DC power charger (1) The battery pack (2) is matched one by one, and when the power supply system is connected to an AC power source, the DC power charger (1) charges through the battery pack (2). 2. The DC emergency power supply system for substation according to claim 1, wherein the emergency system is rectified by a rectifier after being connected to the alternating current, and the data is sent to the monitoring unit (3 ), one output terminal of the rectified DC current is connected to the discharge protection, and the DC power output is performed after the discharge protection, and the other output terminal is connected to the charging protection after being connected to a diode. The two output terminals form a loop, and the loop is A battery pack (2) is provided, and the battery pack (2) charges the DC power charger (1). 3. The DC emergency power supply system for substation according to claim 2, characterized in that, the circuit formed by the two output terminals is also provided with a charging protection module, the module includes a diode and a normally closed contact, and a normally closed contact is set. The contacts are normally charged, and after the charging of the battery pack (2) is completed, the normally closed contacts are triggered and disconnected, and the current is transmitted through the diode. 4. The DC emergency power supply system for substation according to claim 2, characterized in that the alternating current is 110kv. 5. the DC emergency power system for substation according to claim 1, is characterized in that, described battery pack (2) selects lithium battery to supply power for emergency power system, and described lithium battery material comprises lithium cobaltate, nickel Cobalt manganese, lithium manganate, lithium iron phosphate, lithium iron. 6. The DC emergency power supply system for substation according to claim 1, characterized in that, said monitoring unit (3) collects battery pack (2) information in real time, and sets a threshold, when the collected data exceeds the threshold , display warning by display (4). 7. The DC emergency power supply system for substation according to claim 1, characterized in that the battery pack (2) information collected by the monitoring unit (3) includes charging, discharging, current, voltage, short circuit, reverse charging and temperature information.