What are the differences between the functions of the DC screen and the PT cabinet?_Chuanyang Electric Co., Ltd.
What are the differences between the functions of the DC screen and the PT cabinet?
Date of publication: 2017-11-11
The function of the DC screen: The switchgear of the switchgear substation generally has manual closing and electric closing.(Note: Many cabinets now do not have manual closing.) The operating current of electric closing is AC 220V, DC 220V. In order to provide safer and more reliable power supply in the substation, the general operating power supply uses DC operating power.. The function of the DC screen: in the case of power failure, use the DC operating power to quickly close the switch.Injury reduction accident time. In the substation, the transformed AC power source is rectified to produce a DC power source, and then connected to a charging cabinet composed of rechargeable batteries. The DC screen is composed of a rectifier cabinet and a charging cabinet.Introduce into each switch cabinet through combined mother and control mother.Open and close the switch remotely and locally. Closing: Generally, the DC screen is changed to DC240V, and the power supply used for the opening and closing of the circuit breaker’s incoming line.Provide a larger current at the moment of closing. Control mother: Generally, the DC screen changes into DC220V, which supplies power to the operating circuit and provides a smaller current.PT is voltage transformer.Mainly have the following 4 purposes: 1. Provide voltage for measurement, provide voltage for measuring meter, voltage for protection 2. Provide voltage for measurement, provide voltage for power meter 3. Provide operation and control of related equipment Power supply 4. The needs of relay protection devices provide voltage circuits for comprehensive protection devices, such as bus insulation, overvoltage, undervoltage, and automatic switching conditions, etc.. In layman’s terms, the power supply for the small busbar of the high-voltage cabinet screen top voltage is provided by the PT cabinet. The PT cabinet has both measurement PT and measurement PT. The level of the transformer is higher than the level of the protection transformer, but now if there is no special requirement or there is no separate and shared), all are on the small voltage bus on the top of the screen to provide other outgoing high-voltage cabinets with power for measurement, metering, and protection. Etc.; the small bus on the top of the screen also has a small bus with 220V DC voltage.(The voltage is taken from the DC screen, which provides DC power for circuit breakers, comprehensive protection and other equipment); the small bus on the top of the screen also has a small bus with 220V AC voltage.(The voltage is also taken from the AC outlet in the DC screen to provide AC power for the lighting, heater, and other equipment in the cabinet); General high-voltage cabinet screen top small bus layout diagram: 1, 10KV I section closing power supply small bus: +1WCL , —1WCL 2, 10KV Section II closing power supply small bus: +2WCL, —2WCL 3. 10KV Section I control power small bus: +1WC, —1WC 4. 10KV Section I control power small bus: +2WC, —2WC 5, 10KV I section voltage small bus : 1WTVa, 1WTVb, 1WTVc, 1WTVL, 1WTVN 6, 10KV Section II voltage small bus: 2WTVa, 2WTVb, 2WTVc, 2WTVL, 2WTVN 7. Current transmitter power supply small bus: A1, N 8. Cabinet lighting small bus: A2, N DC screen Source of this article: Chuanyang Electric Co., Ltd. http://www.chyele.com
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