ABB mechanical torque observation plate DATX132 3ASC25H216A deflection detection module

Description

Although UPS DATX132 has been widely used as a special power electronic power supply equipment, for the comprehensive application problems of front and rear electrical equipment, electrical load, system grounding, etc. working with UPS, various industries put forward some technical conditions, operation specifications and standards according to their own characteristics and requirements, but these technical conditions, specifications and standards are not completely unified, sometimes even completely contradictory, This requires us to be engaged in electrical work. DATX132 can comprehensively and deeply understand the characteristics of the electrical, UPS, subsequent instrument equipment, and grounding power supply system in practical applications, make specific analysis of specific problems, and propose operation and wiring methods that meet the actual needs to ensure the safety and reliability of power supply system operation.

The requirements for UPS grounding mode in some national or industrial standards are attached:
1. Whether the UPS secondary side output can be grounded
Refer to Article 10.2.15 of DL/T5136-2012 Technical Code for Design of Thermal Power Plant Substation: the distribution system can be ungrounded or grounded, which is determined according to the power requirements of thermal system. The article is explained as follows: “The adoption of ungrounded system can improve the power supply reliability of important electrical equipment, and the adoption of grounding system can meet the requirements of some DCS manufacturers for AC power grounding, and reduce the zero ground voltage.”
“There are various connection methods for the UPS main circuit. When the UPS is grounded: DATX132 When the bypass belt is isolated, the incoming line N is electrically isolated from the UPS output line N, so the output line N is connected to the PE line and the common grounding system. The UPS is still a grounding system after that. When the bypass belt is not isolated, the incoming line N is directly connected to the UPS output line N, so the UPS output line N should not be grounded again, and the UPS is still a grounding system after that.”
“Whether the UPS output N line needs to be grounded shall be determined according to the wiring form and reliability of the UPS, and the requirements of the thermal system for power supply shall be comprehensively considered. Article 8.1.10 of the current national standard GB50174-2008 Code for Design of Electronic Information System Room states that” when the zero ground voltage does not meet the requirements of load use (generally the zero ground voltage shall be less than 2V), measures shall be taken to reduce the zero ground voltage “. Through investigation, some DCS plants have grounding requirements for AC 220V power supply, such as ABB and FOXBORO; Some DCS plants have no requirements for this. When the DCS power supply requires neutral line grounding, the neutral line of the UPS power distribution system can be grounded or an isolation transformer can be added to the DCS to ground the secondary side of the isolation transformer. The use of ungrounded system can reduce the number of power outages, which is conducive to improving the reliability of power supply. For example, the domestic CPR1000 reactor type nuclear power plants have made it clear that the UPS system is ungrounded, and the insulation monitoring device is set to alarm when one point is grounded. The use of grounding system can reduce the zero ground voltage and meet the power supply requirements of some equipment. In addition, when the thermal power supply is ungrounded and the security power supply is grounded, some fast power switching circuits cannot correctly monitor the voltage on both sides, resulting in switching failure. In this case, grounding can also be considered. ”
According to the above explanation, the Regulations on Technical Management of Power Supply System for Process Control Instruments in Sinopec Production Units stipulates that “the neutral point of UPS output device is not grounded” and the Code for Design of Instrument Grounding in Petrochemical Industry (SH-T3081-2003) stipulates that “TN-S system shall be used for power supply in control room”. The requirements for UPS grounding mode are one-sided.
When the UPS load is single-phase, the neutral point ungrounded mode cannot be adopted for three-phase 380/220V UPS. When 380V/220V three-phase output UPS adopts neutral point ungrounded mode, under normal circumstances, as long as the potential of neutral point, i.e. N line, does not exceed the standard, the 220V load of UPS can operate normally. When a phase such as
In case of phase A grounding fault, the N line voltage of B and C phases without fault increases from 220V to 380V. At this time, all 220V loads connected between B-N and C-N are burned.
Therefore, the UPS output neutral point ungrounded mode is only applicable to single-phase output UPS or only 380V load.
2. Whether there is isolation transformer on both sides of UPS AC input and output
Article 10.2.15 of DL/T5136-2012 Technical Code for Design of Substation in Fossil Fuel Power Plants stipulates that isolation transformers shall be installed on both sides of AC input and output of UPS. The provisions are interpreted as follows:
one
As the secondary winding of the isolation transformer adopts the Y-type connection method, a new zero line will be generated after the neutral point is grounded, thus reducing the zero ground voltage.
two
The output isolation transformer can filter out a large number of low order harmonics at the load end, reduce high-frequency interference, and greatly attenuate the high order harmonics.
three
Enhance overload short circuit protection capability and isolate safe load. During the normal operation of UPS, if it encounters large short-circuit current, the transformer will generate reverse electromotive force, which will delay the impact of short-circuit current on the load and inverter, so as to protect the load and UPS host.
four
The output isolation transformer has the ability to “pass AC resistance DC”. If there is no output isolation transformer, once the insulated gate bipolar transistor (IGBT) of the inverter bridge arm is broken down and short circuited, the high DC voltage of the bus will be added to the load, which will endanger the safety of the load.
Article 8.1.10 of GB50174-2008 Code for Design of Electronic Information System Room stipulates that when the potential difference between the neutral line and the PE line at the output end cannot meet the requirements for the use of electronic information equipment, isolation transformers should be equipped.
The potential difference between neutral line and PE line is called “zero ground voltage”. When the “zero ground voltage” is higher than the allowable value of electronic information equipment, it will cause electrical hardware failure and equipment burning; Cause misoperation of control signal; The communication quality is affected. Therefore, when the “zero to ground voltage” does not meet the requirements of the load (generally, the “zero to ground voltage” should be less than 2V), measures should be taken to reduce the “zero to ground voltage”. For TN system, it is an effective way to reduce “zero ground voltage” by equipping isolation transformer at the output end of UPS. When selecting the protection switch of the isolation transformer, the excitation inrush current when the isolation transformer is put into operation shall be considered.

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