High Voltage Disconnector
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Shaanxi huadian electric co., Ltd. It is located in Baoji high-tech development zone, Shaanxi province. A modern high-tech enterprise specializing in integrating research and development, manufacturing, and sales of vacuum circuit breakers.
Shaanxi huadian has nearly 10,000 square meters of circuit breaker production workshop, and has a fully automated control assembly line and a full set of imported circuit breaker testing equipment, with an annual production capacity of 10,000 units.
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What is High Voltage Disconnector？
High-voltage disconnectors are used in electrical substations to allow isolation of apparatus such as circuit breakers, transformers, and transmission lines, for maintenance. The disconnector is usually not intended for normal control of the circuit, but only for safety isolation.
Benefits of High Voltage Disconnector
Staying within electrical code
The code set by the NEC determines the effective and safe use of electronics, devices, and electrical application nationwide. The NEC states disconnect switches as a critical and required component for your business, making it a matter of legality to install them, if nothing else.
Protecting investments
Disconnect switches prevent many common electrical incidents, including short circuits and surges. These problems can severely harm or even destroy important equipment, costing you a lot in replacement and repair, making installing a safety switch a very smart investment.
Promoting personnel and employee safety
Electrical accidents and failures can generate a massive risk for injury and potentially fatality. Safety switches provide exactly as their name suggests and are vital to ensure your associates avoid a very serious health risk.
Providing a cost-effective solution
Replacing equipment is a huge financial strain many businesses would prefer to avoid or may be unable to handle. Disconnects are highly cost-effective, making them one of the most effective means for ensuring your business and assets are safe and secure.
Types of High Voltage Disconnector
Switch disconnector
A switch disconnector combines the properties of a disconnector and a load switch, so it provides the safety isolation function while being able to make and break nominal currents.
Integrated disconnecting switch
In a disconnecting circuit breaker the disconnectors are integrated in the breaking chamber, which eliminates the need for separate disconnectors. The intention of this combined device is to decrease maintenance and increase availability and reliability. The usage of this device instead of a disconnector is limited due to the fact that the open gap is not clearly visible and many doubts in term of safety arise during maintenance activities. Where it is adopted the earthing switch must be used and the performance must be increased by the typical value.
A disconnector, isolator switch, or disconnector switch is used to de-energize the current for maintenance and service. In electric engineering, a disconnector is used to break the circuit found in the electrical distribution. They are used in industrial applications. A disconnector can be manually or motor-operated. It can be paired with the earthing switch for offering the required safety to the professional who is working to fix any electrical issue.
High-voltage disconnectors are mostly used in electrical substations to isolate transformers, transmission lines, and circuit breakers for maintenance. The disconnector offers safe isolation. It does not control the circuit. It lacks the mechanism to suppress the electric arcs that happens when the high currents are interrupted electrically. Therefore, disconnectors are called off-load devices. They will not break and make currents. Instead, they will completely isolate currents.
Components of High Voltage Disconnector
Conductive Part. It mainly includes dynamic and static arc contacts, main contacts or intermediate contacts, and various forms of transition connections. Its role is to pass operating current and short-circuit current.
Insulation Part. Mainly include insulating medium such as oil, vacuum or SF6 gas, porcelain sleeve, insulating rod, etc. Its function is to ensure a good insulation state between the conductive part and the ground, between different phases, and between the same phase fractures.
Arc Extinguishing Part. It mainly includes dynamic and static arc contacts, nozzles and pressure cylinders. Its function is to improve the arc extinguishing ability and shorten the arcing time. It is necessary to ensure reliable breaking of large short-circuit currents, and to ensure that the breaking of small inductive currents does not cut off, or the overvoltage generated does not exceed the allowable value; breaking small capacitive currents does not reignite.
The Operating Part. Mainly refers to various types of operating mechanisms and transmission mechanisms. Its function is to realize the prescribed operating procedures for the circuit breaker and keep the circuit breaker in the corresponding opening and closing positions.
How to Maintain High Voltage Disconnector
Check the operation of your home or business CB at least once a month. For this, the circuit breakers have a test button, no matter its brand or origin. If pressing the button does not trigger the lever, it is damaged.
Never operate an electrical appliance with bare feet or operate a switch with wet hands or feet.
When you are going to carry out any type of repair, make sure you have disconnected the electrical power at the panel and during the work, and always use tools with some type of insulating material.
In installations that have a certain age, it is recommended that a professional electrician carry out revision and maintenance work to prevent future accidents.
Avoid working on the roof near electrical power conductors on windy and stormy days to avoid accidents.
Try to use as much as possible, an outlet for each application, not T-Taps or the like in order to avoid electrical surges.
If you plan to manipulate an installation on your own, you must first turn off the electrical current at the circuit breaker, and check the absence of voltage in the circuit.
Never try to use cables that are very damaged, since the slightest damage to a cable can cause an accident due to electric shock, or even a fire, so it should be replaced as soon as possible with a new one.
Disconnectors are not designed to break fault current although some designs will make fault current. Most disconnectors are available with either a manual drive mechanism or motor operated drive mechanism and the appropriate drive method must be selected for a particular disconnector in a particular substation, e.g. in a remotely controlled unmanned double busbar substation the busbar selector disconnectors would be motor operated to allow ‘on load’ busbar changes without a site visit being required. Disconnector mechanisms incorporate a set of auxiliary switches for remote indication of disconnector position, electrical interlocking and current transformer switching for busbar protection.
Earthing switches are usually associated and interlocked with disconnectors and mounted on the same base frame. They are driven by a separate, but similar, mechanism to that used for the disconnector. This arrangement avoids the need for separate post insulators for the earth switch and often simplifies interlocking. Normally earth switches are designed to be applied to dead and isolated circuits and do not have a fault making capability, however special designs are available with fault making capability if required.
What Is the Difference Between Disconnectors and Circuit Breakers?
The feature that differentiates disconnectors from circuit breakers is that disconnectors do not possess the capability of current interruption. This means that a disconnecting switch cannot be opened when it is conducting current and cannot be closed when there is voltage across the terminals. The key working concept for a disconnector is the electrical distance it creates when opened, thereby providing a visible isolation gap.
Note: A disconnector can interrupt a small current when, after opening, a negligible voltage appears across the contacts.
Solutions for Overheating Faults of Circuit Breaker Switches
There are three ways to deal with the excessive heat of the circuit breaker switch:
①When the switch contacts of the circuit breaker are overheated, clean up the contamination on the moving and static contacts according to the technical specifications. At the same time, wipe the metal parts of the contacts to a bright state, and apply conductive paste according to the specifications.
②The contact surface is oxidized. When overhauling, treat the metal contact part to keep the contact surface flat and have metal brightness; apply an appropriate amount of power grease, and then measure the contact resistance of the isolating switch.
③ When the dynamic and static contacts of the circuit breaker are in poor contact, the bolts should be pressed during installation and maintenance, and electrical grease should be applied to the contact part to improve its electrical conductivity and prevent corrosion or oxidation of the contact part.
Nine Notable Differences between Isolator and Circuit Breaker
Now that we know the essential characteristics of both - a circuit breaker and an isolator, let us dive into the difference between a switch disconnector and a circuit breaker.
|
Basis of Difference |
Circuit Breaker |
Isolator/Disconnector |
|
Definition |
Protective electrical device that acts as a switch to interrupt current flow through a circuit whenever faults are detected. |
A kind of disconnecting switch is used to isolate an electrical system from the main power supply for safety reasons. |
|
Build |
A single unit consisting of an electromagnetic switch and a relay system. |
A simple mechanical switch. |
|
Operation |
Manual and automatic |
Manual |
|
Type |
On-load; can be used when the power supply is on |
Off-load; no current can flow through the circuit when in use |
|
Capacity |
Low, Medium, High |
Low |
|
Use |
Protects the entire circuit from surge currents by switching off the power supply as and when required. |
Isolates faulty parts of a circuit to facilitate repair and/or maintenance. |
|
Applications |
Domestic, commercial, and industrial applications |
Mostly industrial applications |
|
Breaking capacity |
More |
Less |
|
Expense |
More expensive |
Less expensive |
What’s the Difference Between a Fused Disconnect Switch and Circuit Breakers?
While fused disconnect switches and circuit breakers are both intended to open a circuit quickly in the event of a current overload or a short circuit, their designs vary greatly. The main difference between circuit breakers and disconnect switches are the number of uses each can offer. Fused disconnect switches can only operate once before the fuse needs to be replaced. Circuit breakers can be used multiple times. They may be used under slightly different circumstances, depending on the needs of your facility.
A Fused Disconnect Switch Is A Combination Of A Switch To Disconnect The Circuit And A Fuse To Shut The Circuit Off In The Event Of A Problem. When installing or maintaining equipment on the circuit, or the circuit itself, the switch provides a method to manually shut off the power. The fuse incorporates a small filament that is matched to the current rating of the circuit. If the amperage on the circuit exceeds the fuse’s rating for a long enough time, the filament will melt, disconnecting the circuit automatically and permanently.
To Restore Power, The Fuse Must Be Replaced. Fuses are available in multiple sizes and ratings. Standard fuses can react quickly to overcurrent situations, breaking the circuit almost immediately, while slow-burning fuses can handle high currents for short intervals, which can be useful to handle the inrush current of motors when they first start.
A Circuit Breaker Combines The Functions Of A Switch And An Overcurrent Disconnect Into One Device. When maintenance needs to be performed on the circuit or connected equipment, the circuit breaker can be manually turned off. When a short circuit or an overload is detected, an electromagnet turns the circuit breaker off automatically. To restore power once the fault has been corrected, the circuit breaker needs only to be turned back on.
Our Factory
Shaanxi huadian electric co., Ltd. It is located in Baoji high-tech development zone, Shaanxi province. A modern high-tech enterprise specializing in integrating research and development, manufacturing, and sales of vacuum circuit breakers.
