Power engineering terminology (distribution room) (distribution cabinet) (distribution box), a distribution device used to measure and control electrical energy. It consists of busbars, switchgear, protective appliances, measuring instruments and other accessories. The arrangement should meet the requirements of the normal operation of the power system, which is easy to overhaul and does not endanger the safety of the person and surrounding equipment. Located in power plants, power distribution stations, etc.
1. The electrical distribution box (board) of the power distribution and distribution system is installed with no electrical components to be debugged. The system does not count the commissioning fee; the power distribution box (board) of each user room is equipped with an electromagnetic switch. Debugging components such as leakage protectors, but if the manufacturer has adjusted according to the fixed general parameters, the installation unit and the user can directly put into use without self-commissioning, and the commissioning costs will not be counted. The power supply and distribution system that needs to be debugged after the installation of the system is completed, and the installation and construction unit should be debugged at the same time. The installation and construction unit should carry out commissioning according to the technical specifications, make a record, and calculate the commissioning cost according to the quota. In the stage of bidding project preparation and bidding, since electrical equipment (such as distribution box) has not been ordered, it is impossible to predict in advance whether it should be commissioned by the installation and construction unit. Under this circumstance, the units involved in the bidding will cause confusion on the calculation of the bidding price and bid price of the electrical engineering if they agree on a different method. Therefore, for the bidding project, we believe that if the "distribution box (board) is equipped with debuggable components, the commissioning fee for the transmission and distribution system should be temporarily calculated in the budget book, and clearly stated in the budget preparation statement or contract. It is better to deal with this problem when the project is settled and then adjust it according to the actual adjustment. Electrical commissioning is a difficult technical task and requires high professional quality. The cost of each electrical professional should be taken seriously and efforts should be made to master the technology.
2. A unit project must at least calculate the commissioning fee for the power transmission and distribution system of a low-voltage power supply system, that is, the commissioning fee for the AC power supply (comprehensive) system below 1KV (sub-item C2-995). For example, in a building's lighting electrical engineering, each distribution box has no debuggable components, and the building can also calculate a 1KV AC power supply (integrated) system commissioning fee.
Second, the power supply and distribution system system electrical debugging contentThe electrical commissioning of the power distribution and distribution system includes the primary circuit of the circuit breaker, the isolating switch, the current transformer, the reactor, and the secondary circuit of the relay protection and measuring instrument. This commissioning project only considers general relay protection devices (such as current protection for protection against overload and current protection for protection against short circuits), and does not include special protection and test adjustments for automatic device inputs.
1 Transmission and distribution equipment system commissioning is applicable to busbar connection, busbar section, circuit breaker circuit. If busbar protection is provided, the busbar section breaker circuit, in addition to the commissioning of a system's power transmission and distribution device, must be executed again. A busbar commissioning.
2 Transmission and distribution equipment system commissioning does not include special protection and automatic device adjustment. The so-called special protection device refers to power direction protection, distance protection, high frequency protection and line cross-link differential protection; the so-called automatic device refers to the automatic input of the standby power supply, automatic reclosing device. If these protection devices and automatic devices are used, they should be listed separately, and the number should be the same as the number of "systems" of the power distribution and distribution devices.
The commissioning of 3380v and 3~6kv motor feed circuit equipment (such as switchgear or switchboard) is included in the motor inspection wiring and commissioning list items.
4 Transformer (including factory transformer) incoming line equipment to the voltage distribution equipment of each level should not be used as the power distribution equipment system. The debugging work is included in the commissioning list of the transformer system.
The power supply line of the high-voltage power distribution device of the 5th factory shall be quoted from the busbar of the 6kv main distribution device (when the transformer is not used), and the system debugging list of the power distribution device shall be listed separately.
Third, the transmission and distribution debugging instructionsThe power distribution system is debugged with \system\calculation. The engineering quantity calculation rule is the number of circuit breakers according to the number of circuit breakers in the project that meet all of the following conditions. A unit project must calculate at least one loop of the power supply system for commissioning.
(1) A circuit breaker with a rated current of 100 A or greater for the trip unit.
(2) It is not a transformer high and low side circuit breaker and motor control box, and a circuit breaker inside the cabinet.
(3) It is not only a circuit breaker that is used for maintenance isolation and cannot be designed to protect. Transmission and distribution commissioning below 10kV:
1. The power transmission and distribution commissioning sub-project is applicable to the system commissioning of the power distribution circuit below 10 kV, such as the power supply circuit from the power distribution device to the distribution electric box. However, the power supply circuit from the distribution box to the motor is included in the system commissioning of the motor.
2. The commissioning of the power supply system includes the cable test in the system, the withstand voltage of the insulator, the test of the line insulation and all the circuit breakers, relay protection and test of the measuring instrument in one or two lines.
3. General instruments (such as voltmeters, ammeters) and protection transformers are included in the corresponding power transmission and distribution equipment system commissioning; metering instruments and transformers are verified by the power supply department, and the cost is calculated accordingly. Provisions. The switchgear and cable test have been counted in the \transmission and distribution system commissioning\sub-project, no further calculation; the test for the motor-powered cable and switchgear is included in the \motor system commissioning\sub-item; The commissioning of the dense busway to the power distribution is included in the \transmission and distribution system commissioning\, and the dense busway commissioning connected between the power distribution cabinets is included in the distribution system\busbar commissioning\, and the debugging of the transformer outlet dense busway includes In the transformer debugging. None are calculated separately.
4. The commissioning of the power distribution equipment system is considered by one circuit breaker on one side. If there are circuit breakers on both sides, it should be calculated according to two systems.
5, power transmission and distribution equipment system debugging, suitable for system debugging of various power supply circuits (including lighting power supply loop). Where the power supply circuit has debugging components such as instruments, relays, electromagnetic switches, etc. (excluding the knife switch and fuse), it is calculated according to the debugging system. The mobile electric appliance and the household electrical appliance connected by the socket shall not be calculated and commissioned by the equipment that has been debugged by the manufacturer and does not require user self-adjustment.
6. The power supply commissioning of general residential, school, office buildings, hotels, shops and other civil electrical projects is as follows:
(1) The discs, boxes, cabinets and lighting main distribution boxes with debugging components in the distribution room shall perform the corresponding sub-assembly of “Distribution Equipment System Commissioning†according to the power supply mode.
(2) Although the debugging box of electromagnetic switch is installed on the matching box (board) of each user room, if the manufacturer has adjusted according to the fixed general parameters, it is not necessary to install the unit for debugging and can be put into use directly. No commissioning fees are allowed.
(3) The adjustment and verification of the civil energy meter belongs to the professional management of the power supply department. Generally, the user orders the commissioned electricity meter from the power supply bureau, and the commissioning fee cannot be calculated separately.
Fourth, how to debug the transmission and distribution equipment system1. How many sets of high-voltage power distribution cabinets are used to calculate several commissions. The quota set is professionally calculated.
2. The low-voltage power distribution cabinet is not counted but has several calculations. It is included in the quota below 1kV in the commissioning of power transmission and distribution equipment. The quota includes all low-voltage power supply circuits, such as power supply from low-voltage power distribution equipment to distribution power box. The circuit; the power supply loop from the distribution box to the motor is included in the system commissioning quota of the motor.
The commissioning of the power distribution equipment system includes a full set of debugging work such as cable test in the system and pressure resistance of the porcelain bottle. The circuit breakers and busbar section breakers in the power supply bridge circuit are calculated as independent power supply systems.
The quota is considered on the one side of the system with a circuit breaker. If there are circuit breakers on both sides, it is calculated by two systems. If there is only a power supply circuit such as a knife switch, a fuse and an air switch that does not contain the debug component in the distribution box, it is not calculated as a debug system.
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