CN2115543U

CN2115543U - Loss or miss-of-phase indicating device for reactive local compensator

Info

Publication number: CN2115543U
Application number: CN 92201804
Authority: CN
Inventors: 王启敏
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-02-01
Filing date: 1992-02-01
Publication date: 1992-09-09

Abstract

The utility model relates to a loss or miss-of-phase indicating device, which is installed on the external part of a reactive local compensator. When a 'normal work' indicator lamp (luminous diode) goes out, the reactive local compensator is indicated to be damaged; the utility model can remind people of replacement in time. The utility model is characterized in that when the reactive local compensator works normally, the alternating voltage and the electric current of an external terminal which is sheathed on the ring shaped magnetic coil on the external terminal is utilized for perception; after rectification, direct current pulsating voltage is changed into to cause the glow starting of the luminous diode; people are informed that the compensator works normally.

Description

Loss or miss-of-phase indicating device for reactive local compensator

The utility model is a kind of disconnected, phase shortage display device that is installed in reactive power compensation on the spot device outside, when reactive power compensation on the spot device phase failure off-grid or phase-deficient operation, the pilot lamp that shows its " operate as normal " is horizontal blanking, and the prompting people in time change the reactive power compensation on the spot device of damage.

On inductive loads such as asynchronous machine, generally adopt a kind of economize on electricity, the significant reactive power compensation on the spot device of compatibilization effect (to remove H in as Fig. 1 at present both at home and abroad ₁, H ₂, H ₃And the part of LED and D), its internal wiring is as shown in Fig. 1 dot-and-dash line, it is made of bleeder resistance R, anti-coil L and temperature breaker RD and the capacitor group C etc. of shoving, this compensator can bring up to 0.95～0.97 with power factor, economize on electricity 20%, transformer increase-volume 30%, sectional area of wire reduces 30%, and can reach 15 years normal serviceable life.But, this compensator still exists does not have defective disconnected, that phase shortage shows, when compensator inside makes temperature rise to 92 ℃ because of reasons such as overcurrents, temperature breaker RD wherein just opens from circuit interruption automatically, make compensator withdraw from three-phase supply, no longer provide reactive power to asynchronous machine, the effectiveness of economize on electricity, increase-volume also disappears thereupon; If temperature breaker only has one to be fused and another phase when still intact, the reactive power that consumed of required excitation reactive power of asynchronous machine and asynchronous machine leakage field will be provided by that group capacitor of the not phase failure and the transformer of electric substation respectively so, because the resulting reactive power source of asynchronous machine source is different, certainly will produce the imbalance of compensation.In this case, not only reduced the effect of economize on electricity, increase-volume, and because a large amount of compensators all are in a situation long-time running that is fused, transformer must overload and generate heat, thus the serviceable life of having reduced transformer and lead.

The purpose of this utility model is a kind of device that designs for addressing the above problem, and when reactive power compensation on the spot device temperature inside isolating switch hinders for some reason and fuses, is sleeved on the ring-like magnetic induction coil H on compensator (Fig. 1) external connection terminal A, B, the Y ₁, H ₂, H ₃Can perceive the generation of fault by the variation of electric current, voltage in the external connection terminal, in time extinguish " operate as normal " pilot lamp LED that is installed on the compensator protecting cover, thereby reminds people is changed the compensator that damages.

Specific embodiments of the present utility model is: three of suits are by the attached ring-like magnetic induction coil H with the enameled wire coiling of ferroxcube magnet ring on the external connection terminal of reactive power compensation on the spot device ₁, H ₂, H ₃Two ring-like magnetic induction coil H of suit (Fig. 3), or only ₁, H ₂(Fig. 4), ring-like magnetic induction coil H(Fig. 5 of suit again or only), when the compensator operate as normal, exchange current on its external connection terminal will induce certain alternating voltage and electric current on ring-like magnetic induction coil, when adopting display circuit (in the frame of broken lines) shown in Figure 3, need to carry out full-wave rectification and make output certain dc pulse moving voltage and electric current through rectifier D, make light emitting diode (i.e. " operate as normal " pilot lamp) LED starter, at this moment indication is that compensator is working properly, when one of temperature breaker RD fusing, dc pulse moving voltage will be reduced to below the LED operating voltage, make it can not starter, if two temperature breakers fuse simultaneously, rectifier does not have DC voltage output, LED does not work, and the expression compensator is bad, should change; When adopting display circuit (in the frame of broken lines) shown in Figure 4, H ₂Induced voltage carry out half-wave rectification, capacitor C through diode D ₁Make triode BG conducting after the filtering, and H ₁Induced voltage be added in that (LED also plays the half-wave rectification effect) makes its starter on the LED, the expression compensator is intact, after the fusing of one or two temperature breaker RD in the compensator, H ₁Or H ₂, or H ₁And H ₂Non-inductive voltage output, BG ends, and LED extinguishes, and the expression compensator damages, and should change; When adopting display circuit (in the frame of broken lines) shown in Figure 5, when breaking one or two as if compensator temperature inside isolating switch, the base voltage of triode BG reduces or equals zero, and BG is ended, and LED extinguishes, and also represents that compensator damages, and should in time change.In the various embodiments described above on the used ring-like magnetic induction coil around the enameled wire number of turn just make that the LED starter is luminous to be as the criterion after depending on the induced voltage stack of several magnetic induction coil institute.

Fig. 1 is that installation is resolved, the reactive power compensation on the spot device of phase shortage display device.Fig. 2 is the vertical view of Fig. 1.Fig. 3 is an electrical schematic diagram of implementing scheme shown in Figure 1, and Fig. 4, Fig. 5 are that the reactive power compensation on the spot device is disconnected, two kinds of additional electrical schematic diagrams of implementing in addition of phase shortage display device.

Claims

1, a kind of reactive power compensation on the spot device is disconnected, the phase shortage display device, it is made of with light emitting diode (i.e. " operate as normal " pilot lamp) LED that is installed on the compensator protecting cover jointly the ring-like magnetic induction coil and the rectification circuit that are sleeved on the reactive power compensation on the spot device external connection terminal, it is characterized in that: when the compensator operate as normal, exchange current on its external connection terminal will induce certain alternating voltage and electric current in ring-like magnetic induction coil, certain dc pulse moving voltage and the electric current of output makes the LED starter after rectification, shows that compensator is in normal operating conditions.

2, disconnected, the phase shortage display device of reactive power compensation on the spot device according to claim 1 is characterized in that, ring-like magnetic induction coil is sleeved on outside the reactive power compensation on the spot device on the connection terminal.

3, disconnected, the phase shortage display device of reactive power compensation on the spot device according to claim 1 is characterized in that the quantity that is enclosed within the ring-like magnetic induction coil on the compensator external connection terminal can be respectively one, two or three.

4, disconnected, the phase shortage display device of reactive power compensation on the spot device according to claim 1 is characterized in that used ring-like magnetic induction coil is attached with the enameled wire coiling by the ferroxcube magnet ring.