Isolating switch Isolating switch is one of the most used electrical appliances in high-voltage switchgear. As the name implies, it works as an isolation in the circuit. Its own working principle and structure are relatively simple, but due to the large amount of use, high reliability and The impact of the design, establishment, and safe operation of power stations and power plants is large. The main feature of the knife gate is that it has no arc extinguishing ability, and the circuit is open and close without load current.
The following is the product model and its introduction：
GV-AU225, GV2-G345, GV2-G445, GV2-LS22C, GV2-LS14C, GV2-LS16C, GV2-LS20C, GV2-LS07C, VCF1C , VCF01C, VCF02C, VCF3C, VCF2C, NH2-100, NH3-63, NH3-100, NH4-100, NH9-32, XB2BL21C, XB2BL22C, XB2BL31C, XB2BL42C, XB2BP31C, XB2BP42C GV-AU225 GV2-G345 GV2-G445 GV2-LS22C GV2-LS14C GV2-LS16C GV2-LS20C GV2-LS07C XALB01C, XB2BC51C, XB2BC61C, XB2BD217C, XB2BD21C, XB2BD25C, XB2BD337C, XB2BD33C, XB2B41C, XB2BD45C, XB2BG03C, XB2BG21C, XB2BG25C, XB2BG33C, XB2BG41C, XB2B45C, XB2BG53C, XB2BJ21C, XB2BJ25C, XB2BJ33C, XB2BA11C, XB2BA21C, XB2BA22C, XB2B31C, XB2BA3311C, XB2BA4322C, XB2BA4342C, XB2BA51C, XB2BA61C, XB2BC21C, XB2B31C, XB2BC42C, XB2BP21C, XB2BP31C, XB2BP42C, XB2B21C, XB2BP31C, XB2BP42C, XB2BP51C, XB2BP61C, XB2BS142C, XB2BS442C, XB2BS542C, XB2BS742C, XB2BT42C, XB2BVB1C, XB2BVB3C, XB2BVB4C, XB2BVB5C, XB2BVB6C, XB2BVD1C, XB2BVD3C, XB2BVD4C, XB2BVD5C, XB2BVD6C, XB2BVD7C, XB2BVF1C, XB2BVF3C, XB2BVF4C, XB2BVF5C, XB2BVF6C, XB2BVM1C, XB2BVM3C, XB2BVM4C, XB2BVM5C, XB2BVM6C, XB2BVQ1C, XB2BVQ3C, XB2BVQ3C, XB2BVQ4C, XB2BVQ5C,XB2BW367M1C, XB2BW367B1C
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Twillight switch for lighting IC2000-CCT13284
Isolating switch is a switching device mainly used for "isolating power supply, switching operation, to connect and cut off small current circuits", without arc extinguishing function. When the isolating switch is in the sub-position, there is an insulation distance between the contacts that meets the required requirements and a clear disconnection mark; when it is in the closed position, it can carry the current under normal circuit conditions and the abnormal conditions (such as short circuits) within a specified time. Switching device for current. It is generally used as a high-voltage disconnector, that is, a disconnector with a rated voltage above 1kV. Its own working principle and structure are relatively simple, but due to the large amount of use and high reliability requirements, it is necessary for the design, establishment and construction of substations and power plants. The impact of safe operation is large. The main feature of the disconnector is that it has no arc extinguishing capability, and can only open and close the circuit without load current. The entry introduces the functions, characteristics, types, applications, error prevention improvements, maintenance, common problems, etc. of the isolating switch.
Features:
1. After opening the gate, establish a reliable insulation gap, and separate the equipment or line that needs to be repaired from the power supply with an obvious disconnection point to ensure the safety of the maintenance personnel and equipment.
2. Change the line according to the operation needs.
3. It can be used for small currents in the opening and closing lines, such as the charging current of bushings, busbars, connectors, short cables, the capacitor current of the switching voltage equalizing capacitor, the circulating current when the double busbars are connected, and the excitation current of the voltage transformer Wait.
4. According to the specific situation of different structure types, it can be used to divide and close the no-load excitation current of a certain capacity transformer.
Isolation switch is mainly used in low-voltage terminal power distribution systems such as residential buildings and buildings in low-voltage equipment. Main function: disconnect and connect the line without load.
1. Used to isolate the power source, disconnect the high-voltage maintenance equipment from the live equipment, so that there is a visible disconnection point between them.
2. The disconnector cooperates with the circuit breaker, and performs the switching operation according to the needs of the system operation mode to change the system operation wiring mode.
3. Used to connect or disconnect small current circuits.
Generally, a set of disconnectors are installed on the front and back of the circuit breaker. The purpose is to isolate the circuit breaker from the power supply to form a clear disconnection point. Because the original circuit breaker was an oil circuit breaker, the oil circuit breaker needs to be repaired frequently. Therefore, there must be obvious disconnection points on the two sides to facilitate maintenance. In general, the outlet cabinet is powered down from the busbar above the switch cabinet. A group of disconnectors are required in front of the circuit breaker to isolate the power supply, but sometimes, There is also the possibility of incoming calls behind the circuit breaker, such as through the other loops, capacitors and other devices, so a set of disconnectors are also required behind the circuit breaker.
Isolation switches are mainly used to reliably isolate the parts of the high-voltage power distribution device that need to be powered off from the live parts to ensure the safety of maintenance work. The contacts of the disconnector are all exposed in the air and have obvious disconnection points. The disconnector does not have an arc extinguishing device, so it cannot be used to cut off the load current or short-circuit current. Otherwise, a strong arc will occur at the disconnection point under the action of high voltage. It is difficult to extinguish by itself, and may even cause flashover (relative ground or phase-to-phase short circuit), burn equipment, and endanger personal safety. This is a serious accident called "pulling isolating switch with load". Isolation switches can also be used to switch certain circuits to change the way the system operates. For example: In a double-bus circuit, you can use a disconnector to switch the running circuit from one bus to another. At the same time, it can also be used to operate some small current circuits.
The control wiring of the disconnector and the corresponding circuit breaker can be locked to effectively prevent the disconnector from being pulled and closed with load. However, in the operation of the bus-side isolating switch and the line-side isolating switch, due to human reasons, the operation order may be reversed. This is not allowed by the operating principle of switches and knife gates, and it is also one of the causes of accidents in the power system. In order to prevent the operation sequence of the disconnector from being reversed, the original disconnector control wiring of the plant and station that did not use the program lock to prevent mistakes was improved to prevent misoperation and reduce unnecessary accidents.
Schneider Disconnect Switch Features:
The first is that the Schneider disconnect switch can be used to isolate the power supply. It can disconnect live equipment from high-voltage maintenance equipment. You can also see obvious disconnect points on it. The second is that Schneider isolation switches can cooperate with circuit breakers to achieve the purpose of changing the system operation wiring mode. Schneider disconnectors can switch on or off small current circuits. Isolation switches are more commonly used in high-voltage power distribution equipment, which can ensure the safety of maintenance work well.Essentials for operating Schneider disconnectors. It is divided into 3 parts. Including the operation of isolating switch closing, isolating switch opening and isolating opening and closing lock equipped with electromagnetic lock.
Features:
1. When servicing electrical equipment, provide an electrical interval and a clearly visible disconnect point to protect the personal safety of maintenance personnel.
2. Isolation switch can not be operated with load: it can not be operated with rated load or large load, can not be divided, combined load current and short circuit current, but those with arc extinguishing chamber can be operated with small load and no-load line.
3. In general power-on operation: close the disconnector first, then close the circuit breaker or load switch; in power-off operation: first disconnect the circuit breaker or load switch, and then disconnect the disconnector.
4. When selected, it is the same as other electrical equipment, and its rated voltage, rated current, dynamic stable current, and thermal stable current must meet the needs of the application.
The function of the disconnector is to disconnect the circuit with no load current. The equipment to be repaired has a clear disconnection point with the power supply to ensure the safety of the maintenance personnel. Therefore, the disconnector must be operated only when the circuit breaker opens the circuit.
I. Schneider Air Switch Model Introduction
1. Miniature Schneider air switch code marking method:
Example: 1-C65N-C20A / 2P + VE + 30mA + SD
Each meaning is 1--identification number, C65--serial code; N--breaking capacity, N is 6000A, H is 10000A, L is 15kA; C--trip curve, B is electronic protection, C is power distribution Protection, D is power protection; 20A-rated current, there are 1, 2, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63A2P --- number of poles, there are 1, 2, 3, 4-pole, VE--Residual current accessories, including VE, VEG, VM, VEA, VM is electromagnetic, 30mA--Residual operating current, 30, 100, 300mA; SD--Optional accessories, MX, OF MN, MV, SD, Tm, ATm, where SD is the auxiliary contact.
2. Plastic case Schneider air switch
Schneider Molded Case Circuit Breakers Commonly include NSX, NSE, EZD, NSC series products. Example: NSX100N TMD100 3P3DNSX --- Product Series
100-rated current, with 100, 250, 250, 400, 630A; N --- breaking capacity, with 36KA for F, 50KA for H, 70KA for L, and 100KA for L; TMD--trip actuator, with TMD- Magnetic release MIC2.2 MIC5.2A 5.2E 6.2A 6.2E electronic release; 100-16 25 32 40 50 63 80 100A at actual current 100A; 80 100 125 160A at 160A; 125 at 250A 160 200 250A; 400A under 400A; 630A under 630A 3P3D --- Number of poles 3P2D 3P3D 4P3D 4P4D
3.Frame Naide Air Switch
Schneider frame circuit breakers have MT MTE NW series products, for example: MTN106 mic2.0 3P
MT--series number; N1--breaking capacity: N1 N2 50KA, H1 65KA, H1b 85KA, H2 100KA, NWN1 42KA; 06--current 06-630A 08-800A 10-1000A 12-1250A 16-1600A 20-2000A 25-2500A 32-3200A 40-4000A 50-5000A 63-6300A; mic2.0 --- control unit includes: basic mic2.0 basic protection; mic5.0 selective protection; mic6.0 selective protection + ground fault Protection; ammeter A mic2.0A basic protection; mic5.0A selective protection; mic6.0A selection + ground fault protection; mic7.0A selection + leakage protection; energy meter D mic5.0D selective protection; mic6.0D selection + ground Fault protection; power meter P mic5.0P selective protection; mic6.0P selection + ground fault protection; mic7.0P selection + leakage protection; harmonic table H mic5.0H selective protection; mic6.0H selection + ground fault protection; mic7.0H selection + leakage protection; 3P-number of poles 3P 4P 2 files; in addition, there are fixed drawer circuit breakers. A complete frame circuit breaker includes the circuit breaker body, control unit, upper end wiring and lower end wiring. Drawer circuit breakers also need to be equipped with drawers
Main feature:
1. Used to isolate the power source, disconnect the high-voltage maintenance equipment from the live equipment, so that there is a visible disconnection point between them. 2. The disconnector cooperates with the circuit breaker, and performs the switching operation according to the needs of the system operation mode to change the system operation wiring mode.
3. Used to connect or disconnect small current circuits.
Generally, a set of disconnectors are installed on the front and back of the circuit breaker. The purpose is to isolate the circuit breaker from the power supply to form a clear disconnection point. Because the original circuit breaker was an oil circuit breaker, the oil circuit breaker needs to be repaired frequently. Therefore, there must be obvious disconnection points on the two sides to facilitate maintenance. In general, the outlet cabinet is powered down from the busbar above the switch cabinet. A group of disconnectors are required in front of the circuit breaker to isolate the power supply, but sometimes, There is also the possibility of incoming calls behind the circuit breaker, such as through the other loops, capacitors and other devices, so a set of disconnectors are also required behind the circuit breaker.
