Since the invention and use of electricity by human beings, electricity has not only brought a lot of convenience to human beings, but also brought disaster to human beings. It can burn electrical appliances, cause fires, or electrocute people. If there is a device that allows people to use electricity safely, many unnecessary losses will be avoided. Therefore, while all kinds of electrical appliances came one after another, all kinds of circuit breakers were also born. One of them is specially designed to protect people, called leakage circuit breaker.
Residual current circuit breaker, also known as residual current operating device and residual current switch, is a device that trips when a ground fault current occurs, effectively isolating and protecting people and equipment. GSH200 series is a terminal power distribution protection product specially developed by ABB for the construction industry and meets the requirements of terminal power distribution breaking capacity. It is widely used in civil buildings and other occasions.
Because the leakage circuit breaker provides people with great safety guarantee in the process of electricity use, it has also become a key point in circuit control, and electronic components are mostly used as intermediate mechanisms, with high sensitivity and complete functions, so this protection device more and more widely used. I hope that the ABB leakage circuit breaker GSH200 series model parameter selection manual brought by Kexu Xiaobian can solve some of your doubts in the process of selecting leakage circuit breakers.
ABB earth leakage circuit breaker GSH200 series model parameters:
The main operating performance parameters are: rated leakage operating current, rated leakage operating time, rated leakage non-operating current. Other parameters include: power frequency, rated voltage, rated current, etc.
1.Rated leakage current
The current value at which the leakage protector operates under specified conditions. For example, for a 30mA protector, when the incoming current value reaches 30mA, the protector will act to disconnect the power supply.
2.Rated leakage action time
Refers to the time from the sudden application of the rated leakage current until the protection circuit is cut off. For example, for a protector of 30mA×0.1s, the time from the current value reaching 30mA to the separation of the main contact does not exceed 0.1s.
3.Rated leakage non-operating current
Under the specified conditions, the current value at which the leakage protector does not operate should generally be selected as half of the leakage current value. For example, a leakage protector with a leakage current of 30mA, when the current value is below 15mA, the protector should not act.
4.Other parameters such as: power frequency, rated voltage, rated current, etc., when choosing a leakage protector, should be compatible with the circuit and electrical equipment used. The working voltage of the leakage protector should adapt to the rated voltage of the normal fluctuation range of the power grid. If the fluctuation is too large, it will affect the normal operation of the protector, especially for electronic products. When the power supply voltage is lower than the rated working voltage of the protector, it will refuse to act. The rated working current of the leakage protector should also be consistent with the actual current in the circuit. If the actual working current is greater than the rated current of the protector, it will cause overload and cause the protector to malfunction.
ABB earth leakage circuit breaker GSH200 series wiring diagram:
ABB earth leakage circuit breaker GSH200 series operation and maintenance:
1. The installation of the leakage protector shall comply with the requirements of the manufacturer's product manual.
2. The leakage protectors marked with the power supply side and the load side shall not be reversed. If the connection is reversed, the trip coil of the electronic leakage protector will not be powered off when the power is cut off, so that it will burn out after being powered on for a long time.
3. Do not remove or abandon the original safety protection measures when installing the leakage protector. The leakage protector can only be used as an additional protection measure in the electrical safety protection system.
4. When installing the leakage protector, the neutral line and the protection line must be strictly distinguished. When using three-pole four-wire and four-pole four-wire leakage protectors, the neutral wire should be connected to the leakage protector. The neutral wire passing through the leakage protector shall not be used as a protection wire.
5. The working zero line must not be grounded repeatedly on the load side of the leakage protector, otherwise the leakage protector will not work normally.
6. For a branch circuit with a leakage protector, its working zero line can only be used as the zero line of this circuit. It is forbidden to connect with the working zero line of other circuits, and other lines or equipment cannot borrow the circuit or equipment after the leakage protector has been adopted. Working zero line.
7. After the installation is completed, according to the requirements of Clause 3.1.6 of the "Construction Quality Acceptance Specification for Building Electrical Engineering (GB50303-2002), that is, "the leakage protector of the power and lighting engineering should be subjected to a simulated action test", the completed leakage protection shall be protected. The device is tested to ensure its sensitivity and reliability. During the test, the test button can be operated three times, and the load is opened and closed three times to confirm that the action is correct before it can be officially put into use.
The safe operation of the leakage protector is guaranteed by a set of effective management systems and measures. In addition to regular maintenance, the operating characteristics of the leakage protector (including leakage operating value and operating time, leakage non-operating current value, etc.) should be tested regularly, and the test records should be made and compared with the initial installation value. Compare and judge whether its quality has changed.
In use, the leakage protector should be used in accordance with the requirements of the instruction manual, and should be checked once a month according to the regulations, that is, operate the test button of the leakage protector to check whether it can disconnect the power normally. When checking, it should be noted that the time of operating the test button should not be too long, generally it is appropriate to jog, and the number of times should not be too many, so as not to burn the internal components.
If the leakage protector trips during use, if the reason for the switch action is not found after inspection, it is allowed to test the power once.
If the leakage protector is damaged and cannot be used, it should be checked or replaced by a professional electrician immediately. If the leakage protector malfunctions and refuses to act, the reasons are on the one hand caused by the leakage protector itself, and on the other hand, it is the reason from the line. It should be carefully analyzed and the internal devices of the leakage protector should not be disassembled and adjusted without permission.
