CN202663347U

CN202663347U - Circuit controller for self-shunt excitation security system

Info

Publication number: CN202663347U
Application number: CN 201220125461
Authority: CN
Inventors: 汤鸣招
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-29
Filing date: 2012-03-29
Publication date: 2013-01-09
Anticipated expiration: 2022-03-29

Abstract

The utility model relates to a circuit controller for a self-shunt excitation security system, which is critical equipment for solving the problems of transient low voltage and blackout of a power grid. The equipment comprises an inner bypass control mechanism, an outer bypass control mechanism and a randomly arranged control function wave recorder. The inner bypass control mechanism is used as a supplement for a trigger pulse control mechanism for a silicon-controlled rectifier, and plays a role of eliminating the drawbacks of phase conversion overvoltage, negative damping and the like of the silicon-controlled rectifier at ordinary times; and the inner bypass control mechanism can ensure no transient excitation loss of a power generator in case of the failure of the power grid, and has a function of forcibly exciting, thus guaranteeing the transient stability of the power grid and avoiding the occurrence of the blackout accident of the power grid. The outer bypass control mechanism belongs to an emergency mechanism, and only in case of a failure protection action in a unit, an outer bypass switch acts immediately to perform passive de-excitation, so that the power generator is safely and rapidly de-excited. Additionally, the circuit controller disclosed by the utility model is further randomly provided with the control function wave recorder, thus facilitating a user to known the key role of the product.

Description

The security self-shunt excitation system circuit controller

Technical field

The utility model relates to a kind of security self-shunt excitation system circuit controller, is to solve the have a power failure on a large scale key equipment of problem of electrical network transient state low-voltage and electrical network.

Background technology

The transient voltage collapse occurs and the major reason of large area blackout in electrical network repeatedly in the recent period: electric network fault, can not encourage by force from shunt dynamo, and loss of excitation causes the collapse of electrical network transient voltage on the contrary.Because existing in the shunt excitation mode, belong to open networking excitation, the control function of single dependence trigger impulse can not satisfy the requirement of Power Network Transient Stability.The only way out must rely on autonomous innovation, improves the circuit controlling mechanism from shunt excitation system, becomes the loss of excitation of generator into encouraging by force.

Summary of the invention

The problem that the utility model exists for above-mentioned prior art and a kind of security self-shunt excitation system circuit controller is provided, it is according to recently obtaining State Intellectual Property Office's issued patents title " security self-shunt excitation system ", the innovative idea of the patent No. " ZL 2011200447500 ": on the basis of the single dependence trigger impulse control of silicon controlled rectifier, founded inside and outside bypass circuit controlling mechanism.This have an auxiliary controlling mechanism of two bypasses, and it not only for ensureing electricity net safety stable, has dissolved have a power failure on a large scale crisis and a difficult problem, and, also for power plant from the shunt excitation system safe operation with safeguard the aspect, bring a lot of technical economic benefits.

The technical solution of the utility model is as follows:

A kind of security self-shunt excitation system circuit controller is characterized in that: it is comprised of internal bypass negative voltage control section, outer bypass passive demagnetizing control section, main circuit ac de-excitation control section; Wherein, link to each other with the negative pole of rectifier output end after the end parallel connection of internal bypass negative voltage control section by three contacts of internal bypass switch; The other end of its three contacts, the resistance terminal with resistance and diode assembly links to each other respectively; The cathode terminal of three diodes respectively with rectifier under three silicon controlleds control of half-bridge extremely link to each other; Outer bypass passive demagnetizing control section is two contact parallel connections by outer by-pass switch, its contact two ends respectively with the negative pole of rectifier and the anodic bonding of diode, the negative electrode of diode is connected with the positive pole of rectifier output end; Main circuit ac de-excitation control section is closed by operating handle, and after the tripping operation of internal bypass switch, its auxiliary contact that closes starts the envelope time pulse relay, and at this moment, rectifier can be exported 50 all alternating voltages, makes the generator rotor current decay and demagnetization.

Advantage of the present utility model is as follows:

The utility model security self-shunt excitation system circuit controller is to solve the have a power failure on a large scale key equipment of problem of electrical network transient state low-voltage and electrical network.The control function oscillograph that this equipment includes internal bypass controlling mechanism, outer Bypass Control mechanism and is provided with at random.Its internal bypass controlling mechanism is replenished as the SCR trigger pulse controlling mechanism, and at ordinary times, it has the effect of disadvantages such as eliminating controllable silicon commutation overvoltage, negative damping; During electric network fault, it can protect no longer loss of excitation of generator transient state, and the function of forced exciting ensures Power Network Transient Stability in addition, stops the electrical network accident of having a power failure on a large scale and occurs.Its outer Bypass Control mechanism belongs to emergency mechanism, and when just thinking unit internal fault protection action, outer by-pass switch moves immediately, carries out passive demagnetizing, makes safely and fast demagnetization of generator.In addition, the utility model also is provided with control function oscillograph at random, is convenient to the key effect that the user understands this product.

Description of drawings

Fig. 1 is the utility model security self-shunt excitation system circuit controller key wiring diagram.

Fig. 2 is two and receipts or other documents in duplicate series wiring figure of the utility model internal bypass control assembly.

Fig. 3 is two series connection line charts of two parallel connections of the utility model internal bypass control assembly.

Fig. 4 is the utility model by-pass switch operation circuit key wiring diagram.

In the accompanying drawing 1: the 1-generator; The 2-main transformer; The 3-excitation transformer; 4-controllable silicon stream device; The outer by-pass switch assembly circuit of 5-; 6-de-excitation resistance assembly circuit; 7-internal bypass switch module circuit.

In the accompanying drawing 2,3: the outer by-pass switch assembly circuit of WPK-; NPK-internal bypass switch module circuit.

In the accompanying drawing 4: DJJ-power monitoring relay; The LD-green light; NPK-internal bypass switch; The HZ-closing coil; The BS1-operating handle; The HD-red light; The TZ-breaking coil; The AN-button; The JM-ac de-excitation; The DS-electric lock; FMJ-seals time pulse relay; QL-encourages by force; The outer by-pass switch of WPK-; The BS2-operating handle; The WM-passive demagnetizing; BCJ-protects exit relay; MZJ-demagnetization auxiliary relay; CKJ-main transformer gate out switch supervisory relay.

Embodiment

Describe the utility model in detail below in conjunction with drawings and Examples.

Embodiment 1:

The utility model comprises internal bypass negative voltage controlling mechanism, outer bypass passive demagnetizing controlling mechanism, main circuit ac de-excitation controlling mechanism.

The principle wiring of internal bypass negative voltage controlling mechanism assembly circuit 7 links to each other with the negative pole of rectifier output end after its end parallel connection by three contacts of internal bypass switch as shown in Figure 1; The other end of its three contacts, the resistance terminal with resistance and diode assembly links to each other respectively; The cathode terminal of three diodes respectively with rectifier under three silicon controlleds control of half-bridge extremely link to each other.Internal bypass control function: when the generator normal operation, when silicon controlled rectifier pulse pilot angle was spent greater than 60, the rectifier commutation process because the effect of internal bypass control function has been arranged, can avoid producing commutation voltage; When electric network fault, the situation of SCR control pulse disorder or anode voltage phase shortage can not only prevent the controllable silicon commutation failure, guarantees that generator can loss of excitation; And, can make rectifier transfer the single phase half wave rectification state to, guarantee that generator has the function of forced exciting, ensure Power Network Transient Stability, stop power plant, the electrical network accident of having a power failure on a large scale occurs.

The control principle wiring of outer bypass passive demagnetizing controlling mechanism assembly circuit 5 as shown in Figure 1, it is by two contact parallel connections of outer by-pass switch, its contact two ends respectively with the negative pole of rectifier and the anodic bonding of diode; The negative electrode of diode is connected with the positive pole of rectifier output end.Outer bypass controller function: the generating set internal fault, protection exit relay junction closure starts outer by-pass switch and closes a floodgate; After the action of envelope (cutting) pulse auxiliary relay, in the envelope pulse, start outer by-pass switch tripping operation auxiliary relay, make the by-pass switch tripping operation carry out passive demagnetizing.(old unit major loop switch can be used as the reserve demagnetization and trips simultaneously).

The control principle wiring of main circuit ac de-excitation controlling mechanism assembly, main circuit ac de-excitation passage: it is closed by operating handle, after the tripping operation of internal bypass switch, its auxiliary contact that closes starts the envelope time pulse relay, at this moment, rectifier can be exported 50 all alternating voltages, makes the generator rotor current decay and demagnetization.The function of main circuit ac de-excitation: after the normal off-the-line of generating set, but manual operation makes the internal bypass switch trip, starts envelope (cutting) time pulse relay, carries out ac de-excitation.Demagnetization is over, and recovers the internal bypass switch running status of normally closing a floodgate.

The circuit controling assembly associative operation illustrates as shown in Figure 4, and internal bypass circuit controlling mechanism for controlling mechanism commonly used, is to control by the normally open contact of internal bypass switch.Therefore, during the generating set operation, require the internal bypass switch often to be in closing position.Outer by-pass switch is then opposite, requires often to be in the state of opening a sluice gate.The closing operation of outer by-pass switch is controlled by protection exit relay contact, after outer by-pass switch closes a floodgate, by the auxiliary contact WPK of switch, makes internal bypass switch NPK tripping operation, and its NPK contact starts envelope time pulse relay FMJ; Simultaneously, FMJ relay tip startup demagnetization auxiliary relay makes outer by-pass switch tripping operation and carries out passive demagnetizing.Before shutting down after the generator off-the-line, but manual operation internal bypass switch trip handle, behind the internal bypass switch, its auxiliary contact makes envelope time pulse relay FMJ action, and rectifier just can be exported 50 all alternating voltages, and carries out ac de-excitation.Demagnetization is over, and recovers the internal bypass switch running status of normally closing a floodgate.

The utility model is understood " security self-shunt excitation system circuit controller " to the key effect of electrical network, power plant safety stable operation for the ease of users, the spy sets up control function oscillograph at random, so that at demagnetization process of the test and admission exciting current in service, voltage waveform: the unloaded ac de-excitation process of admission generator, rotor current, the time-varying waveform of voltage; During the admission internal fault of electric generator, passive demagnetizing rotor current, the time-varying waveform of voltage; The admission generator is normally in service, in the rectifier commutation process, and rotor current, the time-varying waveform of voltage; During the admission electric network fault, rectifier outlet side rotor current, the time-varying waveform of voltage.

Claims

1. security self-shunt excitation system circuit controller, it is characterized in that: it is comprised of internal bypass negative voltage control section, outer bypass passive demagnetizing control section, main circuit ac de-excitation control section; Wherein, link to each other with the negative pole of rectifier output end after the end parallel connection of internal bypass negative voltage control section by three contacts of internal bypass switch; The other end of its three contacts, the resistance terminal with resistance and diode assembly links to each other respectively; The cathode terminal of three diodes respectively with rectifier under three silicon controlleds control of half-bridge extremely link to each other; Outer bypass passive demagnetizing control section is two contact parallel connections by outer by-pass switch, its contact two ends respectively with the negative pole of rectifier and the anodic bonding of diode, the negative electrode of diode is connected with the positive pole of rectifier output end; Main circuit ac de-excitation control section is closed by operating handle, and after the tripping operation of internal bypass switch, its auxiliary contact that closes starts the envelope time pulse relay, and at this moment, rectifier can be exported 50 all alternating voltages, makes the generator rotor current decay and demagnetization.