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Differential Voltage Discharge Coils

Min. Order:	3 Pieces
Port:	Shanghai, China
Production Capacity:	30000
Payment Terms:	L/C, T/T, D/P, Western Union

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Product Description

Company Info

Basic Info.

Model NO.

Differential voltage protection

Application

Power, Instrument

Phase

Single

Core

Core-type Transformer

Cooling Method

Dry-type Transformer

Winding Type

Two-winding Transformer

Certification

ISO9001, CCC

Usage

Single-phase Transformer

Frequency Characteristics

Power Frequency

Shape of Core

Ring

Brand

Jingcheng Electric

Trademark

Jingcheng electric

Transport Package

Wooden Package

Specification

FDGE35

Origin

China

HS Code

8504909000

Product Description

Introduction of discharge coil

The discharge coil is used in power system to connect with high voltage shunt capacitor, so that the residual charge of capacitor bank after being cut off from power system can be released rapidly. Therefore, the installation of discharge coil is a necessary technical safety measure for shunt capacitors in substation, which can effectively prevent switching overvoltage and over-current endangering equipment safety due to the capacitor still carrying charge when the capacitor bank is switched on again, and ensure the safety of maintenance personnel. This product has secondary winding, which can be used for line monitoring, monitoring and secondary protection.
Discharge coil is a common discharge element in capacitor cabinet. Sometimes, discharge coil will be replaced by discharge Pt. Whether discharge coil or voltage transformer is used for capacitor discharge mainly depends on the capacity of capacitor. Generally, voltage transformer can be used for discharge of small capacity capacitance, and discharge coil must be used for large capacity capacitance.
The discharge coil is suitable for 35kV and below power system and connected with high voltage shunt capacitor bank in parallel
The residual voltage of the capacitor can reach the required value within the specified time. The secondary coil can be used for line monitoring
Principle of discharge coil
Discharge coil is a common discharge element in capacitor cabinet. Sometimes, discharge coil will be replaced by discharge Pt. Whether discharge coil or voltage transformer is used for capacitor discharge mainly depends on the capacity of capacitor. Generally, voltage transformer can be used for discharge of small capacity capacitance, and discharge coil must be used for large capacity capacitance.
When the capacitor is out of power, the discharge coil acts as a discharge load to quickly discharge the residual charge at both ends of the capacitor. In standard, the high voltage seems to require the capacitor to exit. The terminal voltage of the capacitor should be less than 50V within 5 minutes.
During operation, the discharge coil is used as a voltage transformer, and the secondary winding is often connected into an open triangle,
So as to provide protection for internal fault of capacitor bank (PT on bus cannot be used). We often say open triangle protection and unbalanced voltage protection of capacitor bank, and zero sequence unbalanced protection is actually this kind of protection.
This kind of protection is widely used in 10kV single Y connection capacitor bank.
Function of discharge coil in high voltage compensation device
Ordinary electricians will hear about this kind of experience. After one or two days of power failure, they went to repair the capacitor, but they were shocked. When your power grid is cut off, the capacitor can store electric charges. In order to prevent people from being hit by electricity,
So add a discharge coil to reduce the voltage of the capacitor bank to the specified voltage in the specified time, so as to ensure the safety of people. In fact, the principle is that a coil will discharge several poles of the capacitor together, consuming the internal storage charge of the capacitor.
The setting out coil has two functions. During normal operation, it monitors whether the three-phase voltage is balanced. When it is out of balance, an open delta voltage is generated and the voltage relay is input. Then the protection action can select trip or alarm. When the capacitor is cut off, the voltage at the capacitor terminal can be reduced to below 50V within 5 minutes for the safety of maintenance personnel.
It is said that the input time must be more than 5 minutes, so as to avoid the superposition of the power supply on the capacitor, burning the capacitor, or using electrical appliances. This is without scientific basis. The limit of switching times is realized through the secondary control logic software.
Discharge coil
The discharge coil is used in power system to connect with high voltage shunt capacitor, so that the residual charge of capacitor bank after being cut off from power system can be released rapidly. Therefore, the installation of discharge coil is a necessary technical safety measure for shunt capacitors in substation, which can effectively prevent switching overvoltage and over-current endangering equipment safety due to the capacitor still carrying charge when the capacitor bank is switched on again, and ensure the safety of maintenance personnel. This product has secondary winding, which can be used for line monitoring, monitoring and secondary protection.
Discharge coil is suitable for 66kV and below power system. It is connected with high voltage shunt capacitor bank in parallel, so that the residual charge of capacitor after being cut off from the power system can be released quickly. The residual voltage of capacitor can reach the required value within the specified time. With secondary coil, it can be used for line monitoring. Discharge coil is a common discharge element of capacitor cabinet, sometimes it will be used for discharge
Instead of Pt, the discharge coil or voltage transformer is mainly determined by the capacity of the capacitor. Generally, the discharge of small capacity (< 1.7mvar) capacitor bank can be discharged with voltage transformer, and the large capacity capacitor bank (≥ 1.7mvar) must use discharge coil, otherwise the voltage transformer will be burned or exploded.
When the capacitor is out of power, the discharge coil, as a discharge load, will rapidly discharge two capacitors
In order to meet the need of automatic switching for 5 times in 5min. The standard requires that the terminal voltage of the withdrawn capacitor should be less than 50V within 5 seconds.
The outlet ends of the discharge coil are connected in parallel with the two outlet terminals of the capacitor bank
By the voltage of capacitor bank, the secondary winding reflects the primary transformation ratio, and the accuracy is usually 0
50VA / 0.5 grade,
It can operate for a long time under 1.1 times of rated voltage. The secondary winding is usually connected with an open delta or phase voltage differential to protect the internal faults of the capacitor bank
Pt on bus bar). We often say that the open delta voltage protection and unbalanced voltage protection of capacitor banks are actually such protection.

Address: 311121, Hangzhou, Zhejiang, China

Business Type: Manufacturer/Factory, Trading Company

Business Range: Auto, Motorcycle Parts & Accessories, Electrical & Electronics, Industrial Equipment & Components, Instruments & Meters, Light Industry & Daily Use, Manufacturing & Processing Machinery, Metallurgy, Mineral & Energy, Service

Management System Certification: ISO 9000, ISO 14001, OHSAS/ OHSMS 18001

Main Products: Reactor, Shunt Reactor, Magnetic Control Reactor, Current Limiting Reactor, Capacitor, Controller, Discharge Coil, Vacuum Contactors

Company Introduction: Hangzhou Jingcheng electric Equipment Co., Ltd. (Brief name: Jingcheng Electric). Was founded in 1998, registered capital is 60 million yuan. We mainly produces 110kV and below series reactor, shunt reactor, magnetic control reactor, current limiting reactor, etc After years of development, we has gradually combined with other reactive power compensation related products: Capacitor, reactive power compensation controller, discharge coil, SVG, vacuum Contactors and other related reactive power compensation equipment for unified sales and production, in the reactor and reactive power compensation industry to create a domestic leading level, and gradually step out of the country to the world. Our company has specialized in the research of reactive power compensation device for more than 20 years, and has accumulated valuable experience in the industry. We are one of the first domestic manufacturers to develop and manufacture magnetic control reactor, and is also one of the advanced manufacturers of large capacity magnetic control shunt reactor in China.

Jingcheng electric has three production bases, which are located in Cangqian science and Technology Park in Hangzhou, Sandun Industrial Zone in Hangzhou and Deqing high tech Industrial Zone in Huzhou. Jingcheng electric covers an area of more than 120 mu, with a construction area of 400000 square meters, and has nearly 240 employees;

The advantages of our company are reliable product quality, preferential price and excellent service quality. We hope you and I can work together to deliver more reliable, high-quality and clean electric energy for the power transmission and distribution system. Each kW of electricity saved by us for the world will make a huge share for environmental protection. I hope you and I can create a better future together!

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