CN209119803U

CN209119803U - Uninterrupted power supply Intelligent over voltage protective device

Info

Publication number: CN209119803U
Application number: CN201821358978.5U
Authority: CN
Inventors: 潘政强
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-08-23
Filing date: 2018-08-23
Publication date: 2019-07-16
Anticipated expiration: 2028-08-23

Abstract

The utility model discloses a kind of uninterrupted power supply Intelligent over voltage protective devices, belong to power electronics field.Including high-voltage switch gear QF, transformer TK, rectifier diode D1, rectifier diode D2, current-limiting resistance R1, ac capacitor C1, super capacitor C, D.C. contactor KM1, PC application, D.C. contactor KM2, discharge resistance R2, voltage transmitter XT, overvoltage energy super capacitor C is absorbed using transformer TK, diode D, and is equipped with auxiliary control circuit.It is the overvoltage protection that can be installed on power supply buses, for eliminating the Lightning Over-voltage and internal overvoltage of various operating condition middle high-pressure power grids, reaches stable power grid, protection equipment, enhancing system reliability and other effects.

Description

Uninterrupted power supply Intelligent over voltage protective device

Technical field

The present invention relates to a kind of uninterrupted power supply Intelligent over voltage protective devices, belong to power electronics field.For The Lightning Over-voltage and internal overvoltage for eliminating various operating condition middle high-pressure power grids reach stable power grid, protection equipment, enhancing system System certainty equivalence fruit.

Background technique

With economic growth, electric system is also developing at a gallop, installed capacity is increasing, network voltage increasingly Height, area coverage are more and more wider, and the medium-and-large-sized impact load of power grid and nonlinear-load are more and more, make power grid mistake frequent occurrence Voltage, severely impacts the safe and stable operation of electric system, and overvoltage occurs mainly with several respects.

1. vacuum circuit breaker breaking-closing operating overvoltage, vacuum circuit breaker are easy to produce during switching on and off compared with high-amplitude The overvoltage of value, or even the insulation damages of the equipment such as transformer, motor and the alternate flashover fault of breaker are caused, it endangers And the safe operation of power grid.A large amount of field test data analysis is it is found that vacuum circuit breaker divides, closes the capacitance current of capacitor group When, it is easy to produce arc reignition overvoltage；When vacuum circuit breaker cut-offs inductive current, due to vacuum circuit breaker arc extinguishing ability By force, it is possible to create higher cut-off overvoltage causes the frequent movement of arrester, or even causes apparatus insulated damage accident.

Although there is several methods that processing overvoltage can not under the manufacture level of current breaker and service condition Switching overvoltage can be generated with avoiding, cause Zinc-Oxide Arrester frequent movement, very big security burden is caused to operation department.

2. switching shunt reactor switching overvoltage, for the needs of its regulatory function, usually switching is frequent, meanwhile, It is influenced by objective factors such as fabricating yards, in the selection that it cut-offs equipment, with arc extinguishing ability is strong, contact wear is small, opens It is disconnected often, maintenance less, the vacuum circuit breaker for the advantages that time between overhauls(TBO) is long, become design preferred embodiment.But vacuum circuit breaker simultaneously Device such as shuts off, bounces, re-ignition, restriking and generate overvoltage therefrom there are also shortcoming.Overvoltage problem switching simultaneously Seem particularly pertinent when joining reactor group.Reactor belongs to energy-storage travelling wave tube, in operation operating process, since its working condition is sent out Changing, it is possible to create be several times as much as the switching overvoltage of supply voltage.

3. electric arc furnaces overvoltage, can often there be steel scrap slump to get off to collide with electrode and cause short circuit in electric arc furnaces, therefore be In system the size of electric current can irregularly big ups and downs repeatedly, cause very big load impact, current waveform Severe distortion.Electric arc The change dramatically and fluctuation of furnace electric current, make the voltage at distribution bus also generate change dramatically and fluctuation, wherein containing a large amount of Higher hamonic wave, higher harmonic voltage and the superimposed formation overvoltage of power-frequency voltage, are caused greatly to the electrical equipment of same power grid Injury.And higher hamonic wave can cause local pyrexia in generator and motor, destroy insulation, cause motor damage；Make Protective relaying maloperation is made, and power grid normal operation is influenced；Increase the loss of power transformer and consumer electronics equipment, service life drop It is low；Keep instrument and meter metering inaccurate；Prevent reactive power compensator from putting into operation etc..Mineral hot furnace is by arc heat and furnace charge Resistance heat carrys out work, is that degree is slightly light compared with electric arc furnaces.

4. power transformer zero load switching shoves and overvoltage, there is a large amount of power transformer in power grid, they are in zero load Can be generated when investment be equivalent to rated current several times shove and resonance overvoltage；Can be generated when zero load is cut out be equivalent to it is specified The overvoltage of voltage several times.This can not only pollute power grid, influence power supply quality, can also damage to transformer itself.

5. coal mine, mine harmonic wave overvoltage, coal mine, mine, oil field and outskirts of a town and rural work bad environments, condition are poor, Its electric power system fault is multiple, has a significant impact to production and life.Insulation damages, pollution flashover, mist including electrical equipment dodge thing Therefore relay protection and automatic device tripping or malfunction, system unstability etc..

6. electric railway overvoltage, continually pass through non-Electric region in electric locomotive traveling, pass through in the locomotive of front and back It cuts, close a floodgate, the main transformer of locomotive is made to generate switching overvoltage and shove every time.And the traction power that locomotive needs Increasing, impact and voltage fluctuation are also even more serious.Again since tractive power supply system itself is three-phase asymmetric load, electricity Power locomotive is the load of mobile single-phase rectifier band impact, generates a large amount of harmonic wave, negative phase-sequence and reactive power, injects power train System, causes electric power quality to decline, and can lead to protective relaying device malfunction when serious, causes system resonance, overvoltage Damage the accidents such as electrical equipment even large-area power-cuts.

7. wind-electricity integration closing operation overvoltage can repeated main open circuit when wind-electricity integration switchs grid-connected closing operation Device source side fingertip short trouble, existing serious closing rebound overvoltage cause box type transformer main breaker power source side exhausted Coil turn-to-turn short circuit scaling loss occurs under the double action of overvoltage and short circuit current for edge puncture short, box type transformer, box The basic reason that transformer breaks down.

8. Lightning Over-voltage, when thunder discharge, powerful lightning current will pass through the object that hit on ground, the broken ring effect of heat It is all very big with mechanical force destruction, while the very high overvoltage of numerical value, these mistakes can also be induced on neighbouring route High voltage can flee to cause bigger harm into power supply system.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of uninterrupted power supply Intelligent over voltage protective devices.It can supply The overvoltage protection installed on goddess of lightning's line, eliminating bus various types overvoltage makes Network Voltage Stability, can be to avoid confession The various failures such as electric equipment damage.

In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions, and uninterrupted power supply intelligence is excessively electric Press protective device, including high-voltage switch gear QF, transformer TK, rectifier diode D1, rectifier diode D2, current-limiting resistance R1, exchange Capacitor C1, super capacitor C, D.C. contactor KM1, PC application, D.C. contactor KM2, discharge resistance R2, electricity Pressure transmitter XT；The transformer TK primary side winding accesses power grid by high-voltage switch gear QF；It takes out at the both ends of transformer secondary winding Head meets rectifier diode D1, rectifier diode D2 respectively；The negative terminal parallel connection of rectifier diode D1, rectifier diode D2 are followed by current limliting Resistance R1；The contact D.C. contactor KM1 is connected to the both ends current-limiting resistance R1；Another termination super capacitor C of current-limiting resistance R1；It is super The negative terminal of grade capacitor C connects transformer TK vice-side winding centre cap；Ac capacitor C1 is connected to the both ends of super capacitor C；Direct current The both ends of super capacitor C are connected to behind the contact contactor KM2 and discharge resistance R2 series connection；Voltage transmitter XT primary side is connected to super The both ends of grade capacitor C, secondary side signal access PC application；PC application output control line connects respectively Meet D.C. contactor KM1, D.C. contactor KM2.The control system of the uninterrupted power supply Intelligent over voltage protective device uses PC application or industrial control computer COM control system.

PC application or industrial control computer COM control system, by voltage transmitter XT signal acquisition come into Row detection super capacitor C both end voltage, issues the control signal of D.C. contactor KM1, D.C. contactor KM2 after processing operation； The investment current limliting and the release of over-voltage energy for realizing device, to reach device stable operation, eliminate overvoltage, stablize power grid, The purpose protected equipment, enhance system reliability.

Detailed description of the invention

Attached drawing 1 is the main circuit diagram of uninterrupted power supply Intelligent over voltage protective device.

Specific embodiment

A kind of uninterrupted power supply Intelligent over voltage protective device as shown in Figure 1:, including it is high-voltage switch gear QF, transformer TK, whole It flows diode D1, rectifier diode D2, current-limiting resistance R1, ac capacitor C1, super capacitor C, D.C. contactor KM1, may be programmed Sequence controller PLC, D.C. contactor KM2, discharge resistance R2, voltage transmitter XT；The transformer TK primary side winding passes through height The QF that compresses switch accesses power grid；The both ends tap of transformer secondary winding meets rectifier diode D1, rectifier diode D2 respectively；Rectification The negative terminal parallel connection of diode D1, rectifier diode D2 are followed by current-limiting resistance R1；The contact D.C. contactor KM1 is connected to current-limiting resistance The both ends R1；Another termination super capacitor C of current-limiting resistance R1；The negative terminal of super capacitor C connects transformer TK vice-side winding center pumping Head；Ac capacitor C1 is connected to the both ends of super capacitor C；It is connected to after the contact D.C. contactor KM2 and discharge resistance R2 series connection The both ends of super capacitor C；Voltage transmitter XT primary side is connected to the both ends of super capacitor C, and secondary side signal accesses programmable control Device PLC processed；PC application output control line is separately connected D.C. contactor KM1, D.C. contactor KM2.Device opens When dynamic, first high-voltage switch gear QF is closed a floodgate, D.C. contactor KM1 disconnection, is that super capacitor C charges to system by current-limiting resistance R1 Burning voltage；PC application is reached by voltage transmitter XT monitoring voltage to be connect direct current after system burning voltage Tentaculum KM1 closes a floodgate, and the starting state of device completion at this time enters operating status and starts to carry out Intelligent over voltage protection to power grid；Work as electricity Net has overvoltage generation super capacitor C quickly to carry out absorbing to eliminate overvoltage to overvoltage energy；Programmable controller PLC, according to set value calculation D.C. contactor KM2 division, realizes R2 pairs of discharge resistance by voltage transmitter XT monitoring voltage The release of the energy of super capacitor C makes super capacitor C have enough capacity to absorb overvoltage energy next time.

Claims

1. uninterrupted power supply Intelligent over voltage protective device, it is characterized in that including high-voltage switch gear QF, transformer TK, rectifier diode D1, rectifier diode D2, current-limiting resistance R1, ac capacitor C1, super capacitor C, D.C. contactor KM1, programmable controller PLC, D.C. contactor KM2, discharge resistance R2, voltage transmitter XT；The transformer TK primary side winding passes through high-voltage switch gear QF Access power grid；The both ends tap of transformer secondary winding meets rectifier diode D1, rectifier diode D2 respectively；Rectifier diode The negative terminal parallel connection of D1, rectifier diode D2 are followed by current-limiting resistance R1；The contact D.C. contactor KM1 is connected to current-limiting resistance R1 two End；Another termination super capacitor C of current-limiting resistance R1；The negative terminal of super capacitor C connects transformer TK vice-side winding centre cap；It hands over Galvanic electricity holds the both ends that C1 is connected to super capacitor C；Super electricity is connected to after the contact D.C. contactor KM2 and discharge resistance R2 series connection Hold the both ends of C；Voltage transmitter XT primary side is connected to the both ends of super capacitor C, and secondary side signal accesses programmable controller PLC；PC application output control line is separately connected D.C. contactor KM1, D.C. contactor KM2.