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Outdoor zero-sequence protection network system and protection method
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A protection network and zero-sequence technology, applied in emergency protection circuit devices, automatic disconnection emergency protection devices, electrical components, etc., can solve problems such as unsafe hidden dangers, long construction period, and large wind impact, and achieve convenient safety management. , low cost and high work efficiency
Active Publication Date: 2015-12-02
HANGZHOU ZHONGDA ELECTRICAL APPLIANCE CONTRACT
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Problems solved by technology
Its shortcomings: First, the construction period of this device is long, the cost is high, and the minimum construction is hundreds of thousands of RMB, and there are certain safety hazards in the construction process; Unsafe hidden danger of collapse
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Embodiment 1
[0016] Embodiment 1: with reference to attached figure 1 , 2 , 4, 6. An outdoor zero-sequence protection network system, the multi-channel power output terminals of the main circuit 4 in the controller 101 are respectively connected to the power input terminals of the protected device 201, and the signal terminal of the control loop 11 in the controller 101 is connected to the protection network 301 through wires , the protection net 301 is located between the protected object 201 and the protected object 401
[0017] The protected device 201 is a tower crane, a tower crane in the prior art; the protected object 401 is a medium-voltage line, an overhead medium-voltage line near a construction site.
[0018] The protection net 301 is a neutral line protection net and is composed of a plurality of bare metal wires.
[0019] The output ends of the multiple main circuit breakers (8, 9, 10) in the main circuit 4 are respectively connected to the protected device 201, and the in...
Embodiment 2
[0021] Embodiment 2: On the basis of Embodiment 1, the other end of the electric energy meter (7, 8, 9) is connected to one end of the air switch 501 in parallel, the air switch 501 is connected to one end of the surge protector 502, and the other end of the surge protector 502 One end is grounded.
Embodiment 3
[0022] Embodiment 3: On the basis of Embodiment 1 or 2, the protection method of the outdoor zero-sequence protection network system is characterized in that: (1) normal operation: disconnector 1 is closed, protective circuit breaker I12 circuit breaker II13 is closed, AC contactor I coil 14 is energized, AC contactor I contact 15 pulls in, AC contactor II coil 3 is energized, AC contactor II contact 2 is closed, multi-way main circuit breaker (8, 9, 10) Closing, the external power supply supplies power to the protected device 201 respectively through the isolating switch 1 AC contactor II contact 2, the electric energy meter (5, 6, 7) and the multi-channel main circuit breaker (8, 9, 10); When the protective device 201 touches the protective net 301, the circuit breaker I12 and the circuit breaker II13 trip, the AC contactor I coil 14 loses power, the AC contactor I contact 15 breaks, the AC contactor II coil 3 loses power, and the AC contactor The contact 2 of the device II ...
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Abstract
The invention relates to an outdoor zero sequence protective network and a protection method, enabling outdoor operation equipment to guarantee the personal safety of the operating personnel in the working range. The invention is mainly applicable to outdoor building industry. Multiple paths of the power supply output end of a main circuit of a controller are respectively connected with the power input ends of protected devices, a control loop signal end of the controller is connected with the protective net by a conducting wire, and the protective net is positioned among protected objects and protection objects. The outdoor zero sequence protective net and the protection method has the advantages that: firstly, the building process of the outdoor zero sequence protective network is safe and rapid, and is low in cost, the protective network can be built with large area and super elevation, measures are taken for guaranteeing safety performance ( when protected equipment is contacted with the protective net, the power supply of the protected equipment can be cut off, and a high-voltage power line of the protected equipment can automatically carry out tripping and locking, meanwhile an alarm device is started, the power supply of the protected equipment only can be recovered on the permission of safety administrators, and the safety management is facilitated), the response sensitivity is high, and the operation is simple and practical; secondly, the manufacturing cost is reduced by 90%, the working efficiency is high, and protective network can pass the inspection of safety supervisory department in a time.
Description
technical field [0001] The invention relates to an outdoor zero-sequence protection net system and a protection method capable of ensuring the personal safety of operators of outdoor operating equipment within the operating range. It is mainly used in the outdoor construction industry and belongs to the field of outdoor operating equipment protection system manufacturing. Background technique [0002] At present, on the construction site, as long as there is a medium-voltage overhead line (such as 10kV) around the construction site, in order to prevent the tower crane steel rope from touching the medium-voltage overhead line, according to the requirements of the Safety Supervision Bureau, a protective device must be erected between the tower crane and the overhead line. The purpose is to prevent the vicious accident of medium-voltage electric shock caused by the tower crane exceeding the limit. For example: a set of protective nets is established between the tower crane and ...
Claims
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Application Information
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