Can the 1250KVA transformer be without a high voltage switchgear? What harm is there if not?

The 1250kVA transformer should be equipped with a high-voltage cabinet, because the oil transformer should be protected by gas and temperature. Dry transformers should be temperature protected. Danger occurs if it is not protected.

With circuit breaker type ring main unit + medium voltage comprehensive protection, functions such as temperature rise and gas protection can also be realized!

However, the primary side current of 1250kva transformer is not large, and the conventional circuit breaker type ring main unit has 200A outlet type and 630A inlet type, which can fully meet the requirements, and is cheaper than the high-voltage cabinet!

It should be looked at in two cases:

If it is a dry transformer belt housing, it can also be called a transformer cabinet. It can be arranged together with the control cabinet.

If a dry transformer is installed in a high-voltage switchgear, it can also be called a transformer cabinet. (For example, in a 35 10kV substation, the transformer used in 10kV can be installed in a switchgear). At this time, pay attention to the size of the switch cabinet.

Generally, the switchgear of 50kva dry transformer should be 1 meter wide, and the 80kva dry transformer should be meter wide.

A transformer is a device that uses the principle of electromagnetic induction to change the alternating voltage, and the main components are the primary coil, the secondary coil and the core (magnetic core). In electrical equipment and wireless circuits, it is often used for voltage lifting, impedance matching, safety isolation, etc. The main features are:

Voltage conversion, current conversion, impedance conversion, isolation, voltage regulation (magnetic saturation transformer), etc. According to the use, it can be divided into: distribution transformer, power transformer, fully sealed transformer, combined transformer, dry-type transformer, oil-immersed transformer, single-phase transformer, electric furnace transformer, rectifier transformer, etc.

Without a high-voltage cabinet, what protection do you use for your transformer? It can't be directly protected by a substation.

KYN28A-12 is a common high-voltage switchgear in China, the full name is: indoor metal armored removable switchgear. The rated voltage is characterized by the fact that the vacuum circuit breaker is equipped with a mid-mounted type, that is, the circuit breaker is located in the middle of the front cabinet of the switchgear, so the lower space can be saved for the expansion of other solutions or used as a cable room.

K - stands for metal armor, Y - stands for removable type, N - stands for indoor, 28A is the model serial number issued by the industry centralized unit, and the following 12 represents the rated working voltage of 12kV. There are similar product models with different technologies in China: KYN28, KYN96, KYN44, etc., which are all mid-mounted switchgears.

Expand your knowledge. Look at the difference through the criteria:

According to the national standard (GB7251, GB14048) always put the low-voltage switchgear and low-voltage control cabinet together to discuss, at first glance it seems that there is no difference between the two, but in fact, the difference is still very big, so what is the difference between the high and low voltage control cabinet and the high and low voltage switchgear?

Switchgear is a general term for first-class power distribution equipment, which is mainly used for switchgear related to power generation, transmission, distribution and power conversion, as well as the combination of these switchgears and related control, detection, protection and regulation equipment. It also refers to the combination of these electrical appliances and equipment and the associated internal cables, auxiliary parts, enclosures and supporting mechanism parts.

The control equipment is the general name of the secondary power distribution equipment Seguess, which is mainly used to control the switching appliances of the receiving equipment and the combination of these switching appliances and the associated control, disorder-searching detection, protection and adjustment equipment. It also refers to the assembly of these electrical appliances and equipment and the associated internal cables, auxiliary parts, enclosures and support mechanisms.

A single power supply supplies four high-voltage cabinets: inlet cabinet (with inlet PT), metering cabinet (with PT outlet.

Dual power supply for six high-voltage cabinets: 2 inlet cabinets (with inlet PT), 2 metering cabinets (with PT outlet cabinets.

7-9 low-voltage cabinets: 2 incoming cabinets, 2 capacitor cabinets, 1 contact cabinet, 2-4 outlet cabinets.

This depends on your high-voltage incoming method, all the way to the line needs to have a metering cabinet, incoming cabinet, outgoing cabinet, PT cabinet and contact cabinet depends on the situation.

The number of low-voltage outlet cabinets should be determined according to the number of outlets and cabinet type.

5 high-voltage cabinets: incoming cabinets, metering cabinets, PT cabinets, and 2 outgoing cabinets.

7-9 low-voltage cabinets: 2 inlet cabinets, 3 capacitor cabinets, 2-4 outlet cabinets.

This depends on what your transformer is used for, there are two main types.

High supply alloter. High supply and low metering.

The number of plates used is also different.

The high-pressure ones have to ask other friends for advice. Our company only does low-pressure, so I still don't know much about the specific parameters of high-pressure.

This is a regulation, generally 800kva below the transformer can be protected by load switch, drop insurance, 800kva above the transformer should be protected by high-voltage switchgear, but there are some places do not follow the regulations. The 1000kVA is also protected with a load switch.

In fact, in order to reduce investment, load switches are installed indoors to protect transformers and daily power outage operations, and the inside of the high-voltage cabinet is also a load switch, whose main role is also to protect transformers and daily power outage operations.

It should be looked at in two cases:

If it is a dry transformer belt housing, it can also be called a transformer cabinet. It can be arranged together with the control cabinet.

If a dry transformer is installed in a high-voltage switchgear, it can also be called a transformer cabinet. (For example, in a 35 10kV substation, the transformer used in 10kV can be installed in a switchgear). At this time, pay attention to the size of the switch cabinet.

Generally, the switchgear of 50kva dry transformer should be 1 meter wide, and the 80kva dry transformer should be meter wide.

The gyn high-voltage switchgear has not been used, and it should generally be okay.

One metering cabinet, one pressure transformer arrester cabinet, one main cabinet, two sub-cabinets, a total of 5 high-voltage cabinets!

500kva, 250kva transformers don't have to be so complicated, give you a few solutions:

1. Outdoor drop insurance with metering box, a transformer with a set of drop insurance and a metering box, the advantage is simple, economical and applicable, the disadvantage is that the maintenance amount is slightly larger;

2. Use a short-circuit with a metering box, a transformer with a high-voltage short-circuit and a metering box, the advantage is that it is simple and reliable, and the disadvantage is that the short-circuit is slightly expensive.

3. Equipped with indoor switch cabinets, each with a wire outlet cabinet and a common measuring cabinet, the advantage is that the operation is reliable and there are protection devices, and the disadvantage is that the switch room is needed and the cost is high.

A separate cabinet is used for each transformer.