CN204290471U - Batteries off-line electric discharge free of discontinuities switching device shifter - Google Patents

Abstract

The utility model provides a non-interrupted switching device for off-line discharge of a battery pack, comprising a first terminal, a second terminal and a third terminal; the positive pole of the first terminal is connected to the positive pole of the second terminal through a first line, and the negative pole of the first terminal The negative pole of the second terminal is connected with the second line; the first light bulb, the second light bulb and a voltmeter are connected between the first line and the second line; the positive pole of the third terminal is connected with the first line through the third line, and the The negative pole of the three terminals is connected to the second circuit through the fourth circuit; the third circuit is provided with a first diode, and the fourth circuit is provided with a second diode; the third circuit and the fourth circuit are connected with a second circuit. Three light bulbs. With the device of the utility model, when the AC power supply is interrupted or fails, and the charger cannot supply power to the load, the off-line battery pack can switch to supply power to the loads of the whole station without interruption, maintaining the continuity of the DC power supply of the whole station , improve work efficiency and reduce costs.

Description

Battery pack off-line discharge without interruption switching device

【Technical field】

The utility model relates to the technical field of power transformation, in particular to a non-interrupted switching device for off-line discharge of storage battery packs.

【Background technique】

As we all know, the substation DC system is mainly composed of charging module (floating charging device), control unit, DC feed unit (closing circuit, control circuit, protection circuit, signal circuit, public circuit and emergency lighting circuit, etc.), insulation monitoring, battery pack and so on. The most important equipment is the charging module and battery pack. Under normal operating conditions, the secondary equipment in the substation only needs to be powered by the charging module. When the power grid fails, the AC input voltage will inevitably drop. When the charging module fails to work normally, the battery will send power to the DC bus without interruption, without affecting the external function of the DC power panel, ensuring the correct operation of secondary equipment and circuit breakers. Ensure the safe operation of the grid.

During the battery charge and discharge test, under normal circumstances, the battery is used as a backup power supply, and the charger provides sufficient DC power for the DC feed unit. At this time, if the battery needs to be charged and discharged, it is necessary to disconnect the battery and the charger. In order to ensure the normal and uninterrupted power supply of the entire DC system, especially to provide a reliable backup power supply when the AC power supply is lost or the charger is out of service due to failure, generally two sets of batteries are used as backup for each other in substations above 220kV. 110kV and 35kV substations have only one set of storage batteries, which is more troublesome. In order to ensure the reliability of the protection action due to external faults, when doing the check discharge test, the conventional check discharge method is: bring a set of spare batteries, put This method has many disadvantages: first, it is very heavy to carry a spare battery, and the wiring is very troublesome; second, the cost of the equipped battery is relatively high; third, it is necessary to regularly check the spare battery Maintenance is very troublesome.

【Content of utility model】

In view of this, in order to overcome the deficiencies of the prior art, the utility model provides a non-interrupted switching device for off-line discharge of battery packs that can switch power supply to the loads of the whole station without interruption and maintain the continuity of the DC power supply of the whole station.

In order to achieve the above purpose, the utility model provides a non-stop switching device for off-line discharge of a battery pack, which is characterized in that it includes a first terminal, a second terminal and a third terminal;

The positive and negative poles of the first terminal are connected to the battery pack, the positive and negative poles of the second terminal are connected to the discharge tester; the positive pole of the first terminal is connected to the positive pole of the second terminal through the first line, and the positive pole of the first terminal The negative pole and the negative pole of the second terminal are connected through the second line; the first light bulb, the second light bulb and the voltmeter are also connected between the first line and the second line; There is a first air switch for controlling the switch of the switching device and a second air switch for controlling the operation of the discharge device;

The positive and negative poles of the third terminal are connected to the DC bus; the positive pole of the third terminal is connected to the first line through the third line, and the negative pole of the third terminal is connected to the second line through the fourth line; A first diode is provided on the third circuit, a second diode is provided on the fourth circuit, and a third air switch is also provided on the third circuit and the fourth circuit; the third circuit and the fourth circuit A third light bulb is also connected between the lines.

The utility model has the advantages that: the device of the utility model is connected to the system without using a backup battery when performing a discharge test on the storage battery of a power substation, and the off-line checking discharge of the battery pack is performed. The DC load of the whole station is temporarily powered by the charger. When the AC power supply is interrupted or fails, and the charger cannot supply power to the load, the off-line battery pack can switch to supply power to the load of the whole station without interruption, maintaining the power supply of the whole station. The continuity of DC power supply improves work efficiency and reduces costs.

【Description of drawings】

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

Fig. 2 is a panel layout diagram of the utility model.

【Detailed ways】

In order to better understand the utility model, the utility model will be described in detail below in conjunction with the accompanying drawings and specific examples.

The off-line discharge uninterrupted switching device for battery packs as shown in the figure is characterized in that it includes a first terminal JXZ1, a second terminal JXZ2 and a third terminal JXZ3;

The positive and negative poles of the first terminal JXZ1 are connected to the battery pack, the positive and negative poles of the second terminal JXZ2 are connected to the discharge tester; the positive pole JXZ11 of the first terminal JXZ1 is connected to the positive pole JXZ21 of the second terminal JXZ2 through the first line a, and the positive pole of the second terminal JXZ2 is connected to the discharge tester. The negative pole JXZ12 of the first terminal JXZ1 is connected to the negative pole JXZ22 of the second terminal JXZ2 through the second line b; the first light bulb DX1, the second light bulb DX2 and the voltmeter V are also connected between the first line a and the second line b; The first air switch K1 for controlling the switch of the switching device and the second air switch K2 for controlling the operation of the discharge instrument are both provided on the first line a and the second line b;

The positive and negative poles of the third terminal JXZ3 are connected to the small DC bus; the positive pole JXZ31 of the third terminal JXZ3 is connected to the first line a through the third line c, and the negative pole JXZ32 of the third terminal JXZ3 is connected to the second line b through the fourth line d connection; a first diode D1 is provided on the third circuit c, a second diode D2 is provided on the fourth circuit d, and a third air switch K3 is also provided on both the third circuit c and the fourth circuit d; A third bulb DX3 is also connected between the third line c and the fourth line d.

The device of the utility model connects the first terminal JXZ1, the second terminal JXZ2 and the third terminal JXZ3 to the storage battery pack, the discharge tester and the DC small bus respectively during normal charge and discharge. Close the first air switch K1 of the switching device, control the second air switch K2 of the discharge instrument, connect the third air switch K3 of the DC small bus, and disconnect the main insurance or air switch between the charging device and the storage battery. At this time, The DC small busbar is normally powered by the charging device, and the DC small busbar is powered by the charger. The terminal voltage is higher than the terminal voltage of the storage battery. K1 and the second air switch K2 are connected for normal discharge test.

The light of the first light bulb DX1 indicates that the battery is discharging; the light of the second light bulb DX2 indicates that the discharge instrument is working; the light of the third light bulb DX3 indicates that the power supply circuit is normal.

If the AC power supply disappears or the charger fails, the small DC bus cannot be powered normally by the charger, and the voltage drops. At this time, the first diode D1 and the second diode D2 conduct in one direction, and the battery pack can be used as a small DC bus. Continuous power supply ensures the continuous reliability of the DC power supply of the whole station when the battery pack is used for off-line discharge test.

The above-mentioned implementation examples only express some implementations of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (1)

1. a batteries off-line electric discharge free of discontinuities switching device shifter, is characterized in that: comprise the first terminal (JXZ1), the second terminal (JXZ2) and the 3rd terminal (JXZ3);

The both positive and negative polarity of described the first terminal (JXZ1) is connected with batteries, and the both positive and negative polarity of described second terminal (JXZ2) is connected with discharge tester; The positive pole (JXZ11) of the first terminal (JXZ1) is connected by first line (a) with the positive pole (JXZ21) of the second terminal (JXZ2), and the negative pole (JXZ12) of the first terminal (JXZ1) is connected by the second circuit (b) with the negative pole (JXZ22) of the second terminal (JXZ2); The first bulb (DX1), the second bulb (DX2) and voltmeter (V) is also connected with between described first line (a) and the second circuit (b); Described first line (a) and the second circuit (b) are equipped with first air switch (K1) of control switching device shifter switch and second air switch (K2) of controlled discharge instrument work;

The both positive and negative polarity of described 3rd terminal (JXZ3) is connected with the little bus of direct current; The positive pole (JXZ31) of described 3rd terminal (JXZ3) is connected with first line (a) by tertiary circuit (c), and the negative pole (JXZ32) of described 3rd terminal (JXZ3) is connected with the second circuit (b) by the 4th circuit (d); Described tertiary circuit (c) is provided with the first diode (D1), 4th circuit (d) is provided with the second diode (D2), and tertiary circuit (c) and the 4th circuit (d) are also equipped with the 3rd air switch (K3); The 3rd bulb (DX3) is also connected with between described tertiary circuit (c) and the 4th circuit (d).