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Primary and secondary fusion circuit breaker

In the field of power distribution systems, primary and secondary fuse circuit breakers play a key role in ensuring the safety and reliability of power supply. These devices are designed to isolate faults and protect circuits from overloads and short circuits. Primary fuse circuit breakers are typically used at the main distribution level, while secondary fuse circuit breakers are used in branch circuits, providing a comprehensive solution for fault management and power restoration.

Sectional load switch groups are an integral part of modern power systems and are primarily used in main line sectioning and communication locations. These switches provide local automatic isolation in the event of a main line fault, thereby improving the overall reliability of the distribution network. By supporting voltage synchronization logic, these devices ensure that the power system responds to faults quickly and effectively, minimizing downtime and potential equipment damage.

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    Product Details

    General requirements for secondary fusion switches

    1) The primary and secondary integrated complete sets of pole-mounted switches can be divided into four types according to their application functions: sectional load switch sets, sectional circuit breaker sets, boundary load switch sets and boundary circuit breaker sets.

    2) The complete set of section load switches is mainly used for main line sectioning/communication positions: to realize the function of automatic on-site isolation in case of main line failure, and to support voltage-synchronous logic.

    3) The complete set of sectionalized circuit breakers is mainly used to meet the requirements of grade difference, which can directly cut off the main branch link of the fault and have the function of closing the circuit breaker.

    4) Boundary load switches and boundary circuit breakers mainly realize the function of local isolation or removal of user-end branch line faults.

    5) The pole-mounted switchgear has a comprehensive local feeder automation function, which is independent of the master station and communication. It uses short-circuit/ground fault detection technology, positive pressure disconnection, fault line adaptive delay power closing and other control logic, adaptive multi-separate multi-connection distribution network frame, and realizes local line selection, section positioning and isolation of short-circuit faults; cooperates with the substation outlet switch for the primary contract to realize the section positioning of short-circuit faults and instantaneous fault power supply restoration; cooperates with the substation outlet switch for the secondary closing to realize the local automatic isolation of faults and power supply restoration in the upstream area of ​​the fault.

    6) The switch body, control unit, and voltage transformer are connected by outdoor fully insulated cables using military-grade aviation connectors.

    7) The switch body should meet the relevant requirements of the State Grid Corporation of China, and the control unit should meet the relevant requirements of Q/GDW514 (distribution automation terminal/substation function specifications) and (distribution automation terminal technical specifications).

    Secondary fusion function requirements

    Functional requirements for sectionalizing/connecting circuit breakers

    1)-The secondary complete set consists of switch, control unit, power supply voltage transformer, connecting cable, etc.

    2) The switch body should have built-in high-precision, wide-range voltage/current sensors to meet the requirements of fault detection, measurement, metering and line loss calculation. 3) The switch uses a built-in set of voltage sensors to provide Ua, Ub, Uc, Uo (measurement, metering) voltage signals, a built-in set of current sensors to provide la, Ib, I℃, l0 (protection, measurement, metering) current signals, and two external power supply voltage transformers installed on both sides of the switch. The line voltage signal is taken from the power supply voltage transformer.

    4) It has the ability to collect three-phase current, three-phase voltage, zero-sequence current and zero-sequence voltage, and can calculate active power, reactive power, power factor, frequency and measure electric energy.

    5) It has the function of handling phase-to-phase faults and single-phase grounding faults in small current grounding systems, can directly trip and remove faults, and has automatic reclosing function,Timely and adjustable.

    Functional requirements for sectionalizing/interconnecting load switch sets

    1)-The secondary complete set of equipment consists of the switch body, control unit, power supply voltage mutual inductance, connecting cables, etc.

    2) The switch body should have a built-in high-precision, wide-range voltage/current sensor to meet the requirements of fault detection, measurement, metering and line loss calculation. 3) The switch uses a built-in set of voltage sensors to provide Ua, Ub, UC, Uo (measurement, metering) voltage signals, and a built-in set of current sensors. Provide la, lb, I℃, lo (protection, measurement, metering) current signals, and two external power supply voltage transformers are installed on both sides of the switch. The line voltage signal is taken from the voltage transformer.

    4) It has the function of "closing when power is on and opening when voltage is lost", which can meet the local feeder automation function of local isolation of trunk line faults in coordination with the substation outgoing line, and has the non-interrupting protection function to ensure that the switch does not interrupt large currents.

    5) It has the ability to collect three-phase current, three-phase voltage, zero-sequence current, and zero-sequence voltage to calculate active power, reactive power, power factor, frequency, and metering.

    6) With forward locking function, if the switch loses pressure within the set time after closing, it will automatically open and lock the switch, and the forward power supply switch will not be closed. 7) With reverse locking and closing function, if the switch loses power or there is momentary residual pressure within the set time after closing, it will be reverse locked and closed, and the reverse power supply switch will not be closed.

    8) It has the function of ground fault isolation. If there is a sudden change from zero-sequence voltage to zero-sequence voltage within the set time after the switch is closed, the switch will automatically open and lock the closing, and the forward power supply switch will not be closed.

    9) It has the function of ground fault isolation. If there is a ground fault on the load side of the switch, it will trip with a delay and directly select the ground fault line.

    10) It has a locally selectable dial code for disconnection/contact mode and has the function of automatic power transfer in contact mode.

    11) It is equipped with a selection switch for centralized control mode and local reclosing mode (voltage time type), and the remote signal status of the selection switch can be actively reported to the main station.

    Functional requirements for complete set of boundary circuit breakers

    1) The boundary circuit breaker consists of four parts: switch body, control unit, power supply voltage transformer and connecting cable.

    2) The switch shall have at least A and C phase current transformers and zero-sequence current transformers built in to meet the application requirements of phase current and zero-sequence current, and an external power supply voltage transformer shall be installed on the power supply side.

    3) It has the function of handling phase-to-phase faults and grounding faults in small current grounding systems. It can directly trip and cut off the phase-to-phase faults and grounding faults on the user side, and has a one-time reclosing function.

    Functional requirements for boundary load switch sets

    1) The boundary load switch consists of a switch body, a control unit, a power supply voltage transformer, a connecting cable, etc.

    2) The switch shall have at least A and C phase current transformers and zero-sequence transformers built in to meet the application requirements of phase current and zero-sequence current. An external or built-in power supply voltage transformer shall be installed on the power supply side.

    3) It can automatically isolate the phase-to-phase short-circuit fault on the user side and automatically cut off the grounding fault on the user side to meet the application requirements of non-interrupting current blocking.