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You know what electrical engineers have to know?
Release time:2024-12-09   Visit volume:1103

First, a preliminary understanding of complete sets of electrical equipment


As a quotation officer of complete electrical equipment, we must first understand what is called complete electrical equipment.


The complete set of electrical equipment refers to the complete equipment composed of the shell, bus, primary and secondary components, auxiliary materials, etc., which operates in the power grid and plays the role of accepting and distributing electric energy, and plays the role of controlling and protecting the power equipment.


Electrical equipment is mainly divided into: 0.4kV, 0.69KV, 1.2KV low-voltage switchgear; 3.6KV, 7.2KV, 12KV, 24KV medium voltage switchgear (current development trend), 40.5KV high voltage switchgear, power box (cabinet), lighting box, control box (cabinet, table), protection screen, DC screen, etc.


Product models are mainly divided into the following three categories:


1, low voltage: PGL (not recommended), GGD (safe, reliable and cost-effective, so widely used), BFC (not recommended), GCL (K) (not recommended), GBD, GCS (Senyuan design), MNS (ABB technology);


2. Middle and high pressure: GG-1A (F) (not recommended), XGN2-12 (not recommended), KYN1-12 (not recommended), JYN2,6-12 (not recommended), HXGN-12 (F), XGN15-12 (SF6), KYN18-12, KYN28-12 (mainstream products in the market), KYN □-24 (developing trend), JYN1-40.5 (not recommended), XGN□ (JGN□) -40.5 (not recommended), KYN61-40.5 (mainstream products on the market), KYN96-40


3, box variation: YBM□-12 (24, 40.5) /0.4, ZGS9 (11) -12 (40.5) /0.4, 10KV medium voltage switch station, 35KV high voltage switch station.


Second, learn and master the basic knowledge of complete sets of electrical equipment


As an electrical equipment quoter must be able to read and understand the primary system diagram, secondary schematic diagram, layout diagram, and the relationship between the three. This requires the quotation officer to see more, learn more and ask more.


In the complete set of electrical equipment, the bus, isolating switch (high voltage), knife switch (isolating switch) (low voltage), circuit breaker (air switch), leakage circuit breaker, voltage transformer, current transformer, power transformer, AC contactor, protective relay (thermal relay), lightning arrester and other equipment is called primary equipment. The loop composed of them according to the principle relationship is called a primary loop or a primary scheme diagram. In order to make the primary system operate safely, reliably and stably, monitor the operating status of the primary system at any time, and control the primary system at any time must be equipped with many other electrical components and equipment, such as: Measuring instruments (ammeter, voltmeter, power factor meter, power meter, frequency meter, etc.), control signal components (signal lamp, button, universal switch, etc.), relay protection devices, etc. The circuit composed of them according to the principle relationship is called the secondary circuit or the secondary scheme diagram.


Third, understand the price composition of complete sets of electrical equipment


1. Prices of primary and secondary components;


2, the price of auxiliary materials, including: secondary wire, terminal, wire nose, wire clamp, winding tube, number tube, character code, cable tie, standard parts, etc.;


3, the busbar price, busbar consumption according to the first plan budget;


4, shell price, need to be quoted by professional shell manufacturers according to a plan; Box-type substations and non-standard boxes (cabinets) are calculated according to the box size.


5, packaging and transportation costs;


6, enterprise comprehensive expenses, including management fees, labor wages, taxes and profits;


7. Other expenses, such as certain fees to be paid to the bidding company if the bid is won.


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