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Direct-current emergency transfer box and using method thereof

A transfer box and direct current technology, which is applied in the direction of direct current circuits with more than three wires, parallel operation of direct current power supplies, direct current network circuit devices, etc., can solve the problems of lack of effective supervision and protection, increased danger of direct current boxes, uneven quality, etc. problems, to achieve the effect of improving reliability and safety, improving on-site work efficiency, and improving safety

Pending Publication Date: 2020-12-18
MEISHAN POWER SUPPLY CO STATE GRID SICHUAN ELECTRIC POWER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The construction and wiring of the traditional load-changing temporary power supply is based on the site conditions, using temporary equipment such as wooden boards, manually marking the interface, and temporarily building the wiring. There may be a voltage difference between the temporary feeder screen and the DC power distribution box of the system. Temporary The reliability and safety of the power supply are determined by the ability of the on-site protection personnel. The quality is uneven, cannot be effectively supervised and guaranteed, and a lot of on-site time needs to be wasted, which increases the danger in the DC box transformation process

Method used

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  • Direct-current emergency transfer box and using method thereof
  • Direct-current emergency transfer box and using method thereof
  • Direct-current emergency transfer box and using method thereof

Examples

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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, a DC emergency transfer box 2 of the present invention includes a monitoring and protection device, and the monitoring and protection device includes an insulation monitor connected in parallel at the positive and negative poles of the DC emergency transfer box 2 power supply bus, a DC monitor and a DC lightning protection The insulation monitor performs real-time insulation monitoring on the DC emergency transfer box 2 circuit. The DC monitor has the functions of DC measurement, display and undervoltage alarm and control (contact output), and displays the measured DC voltage in real time. The undervoltage can be set at will Alarm voltage, and relay contact output; real-time monitoring of the working voltage of the DC emergency transfer box 2 circuit, when the circuit voltage is abnormal or DC grounding, an alarm signal is sent; the DC lightning protection device prevents the instantaneous The overvoltage is limited within the voltage range th...

Embodiment 2

[0053] On the basis of Embodiment 1, a DC emergency transfer method, the connection relationship is as follows figure 2 shown, including steps:

[0054] S1: The upper terminal block 6 of the DC emergency transfer box 2 is connected to the DC power supply 1;

[0055] S11: the second upper terminal block 6 of the DC emergency transfer box 2 is connected to the inverter backup power supply 9;

[0056] S2: The lower terminal block 11 of the DC emergency transfer box 2 is connected to the old DC power distribution box 8 to eliminate the voltage difference between the two, and the old DC power distribution box 8 is connected to the system power supply 10;

[0057] S3: Select the air switch 5 of the corresponding capacity on the DC emergency transfer box 2 according to the power of the load 7, connect the load 7 through the air switch 5, and close the air switch 5. At this time, the load 7 is connected by the DC emergency transfer box 2 and the old DC power distribution box 8 supp...

Embodiment 3

[0069] Such as image 3 As shown, in this embodiment, on the basis of Embodiment 2, a lower connection terminal row 11 of No. 1 DC emergency transfer box 2 is connected with an upper connection terminal row 6 of No. 2 DC emergency transfer box 2 to form a parallel transfer Connection box group; the lower terminal block 11 of the No. 2 DC emergency transfer box 2 is connected to the target DC power distribution box, and the two upper terminal blocks 6 of the No. 1 DC emergency transfer box 2 are respectively connected to the DC power source 1 and the inverter The backup power supply 9, the target DC power distribution box is connected to the system power supply 10, and the air switches 5 of the two emergency transfer boxes 2 can be used for the transfer of the load 7 at the same time. When the number of loads 7 in the target DC power distribution box is too large , the operation mode of this embodiment can be selected to ensure the safe operation of the direct current switching...

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Abstract

The invention discloses a direct-current emergency transfer box and a using method thereof. The direct-current emergency transfer box comprises a direct-current emergency transfer box body and a monitoring protection device, and the monitoring protection device comprises an insulation monitor, a direct-current voltmeter and a direct-current lightning protection device which are connected to the positive pole and the negative pole of a power bus of the direct-current emergency transfer box in parallel; and the direct-current lightning protection device is also connected with a direct-current lightning protection device air switch in series. The direct current emergency transfer box is applied to load transfer work, the monitoring protection devices are connected to the positive end and thenegative end of the power bus of the transfer box in parallel, when the circuit voltage is abnormal or direct current is grounded, an alarm signal is sent out, the situations of direct current power loss and short circuit in the transformation work are avoided, and the reliability and safety of load transfer work are improved; the multi-capacity and multi-number air switches are arranged in the transfer box to serve as output branches, the actual requirements of different access loads are met, and the safety of direct-current emergency switching work is improved.

Description

technical field [0001] The invention relates to a line load transfer tool and method, in particular to a direct current emergency transfer box and a use method thereof. Background technique [0002] The DC box provides reliable DC power for control, signal, relay protection and automatic devices in the substation, and also provides reliable operating power for circuit breakers. The reliability of the DC box plays a vital role in the safe operation of the substation and is the guarantee for the safe operation of the substation. With the arrival of the peak period of substation technical transformation and DC expansion and transformation in recent years, more and more DC power distribution boxes need to be removed and replaced with new DC power distribution boxes with larger capacity. However, the reliability of the DC power supply requires that the DC power supply cannot be interrupted during the replacement process, which requires a substation DC box-to-load control device,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/08H02J1/10H02H9/04
CPCH02H9/04H02J1/10H02J1/086
Inventor 潘南西别进平杨雄吴昊李滨辰
Owner MEISHAN POWER SUPPLY CO STATE GRID SICHUAN ELECTRIC POWER CO
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