CN2602531Y

CN2602531Y - Secondary open circuit protector for current transformer

Info

Publication number: CN2602531Y
Application number: CN 00229882
Authority: CN
Inventors: 柯迪民; 吴家献; 李汝军; 黄维
Original assignee: No4 Prospecting And Design Inst Ministry Of Railway
Current assignee: No4 Prospecting And Design Inst Ministry Of Railway
Priority date: 2000-05-11
Filing date: 2000-05-11
Publication date: 2004-02-04
Anticipated expiration: 2010-05-11

Abstract

The utility model relates to a current transformer secondary side open circuit protector, connected in parallel with the current transformer. When the current transformator secondary side open circuit has voltage, through the function of the voltage, the protective loop of the protector starts the spring uncoupling rigging of the protector, thereby making the protector connection short circuit, realizing the aims to protect the equipment and workmen to avoid the high voltage endanger of the secondary side open circuit. The panel button of the protector can indicate the position after moving, convenient for workmen monitoring, reconditioning and resuming; through adding the assistant connection, the utility model also can realize the remote monitor to the secondary equipment. The utility model is suitable for the transformer station of the electric system.

Description

Current Transformer Secondary side open-circuit protector

In the transformer and distribution station of electric power system; be provided with supervision, metering, control and protective device in order to ensure distribution equipment safety normally, reliably to turn round in an orderly manner, basic electrical quantity such as electric current, the voltage etc. of this class device input are obtained by current transformer, voltage transformer secondary side.

As everyone knows, the secondary side of current transformer does not allow open circuit, otherwise, existing at the current transformer primary side under the situation of electric current, its secondary side open circuit place jeopardizes generation the high-tension electricity of equipment and personal safety.Still do not have any effective safeguard measure for this situation at present, reason is not have clear and definite regulation on the technical specification of design and operation, and does not also have maturation and effectively protect equipment relevant with this respect.Consider that from the designing requirement that becomes the distribution secondary circuit secondary device function, maintenance, detection are required more and more higher, it is also more and more to insert relevant components and parts in secondary circuit, has more increased the probability of Current Transformer Secondary side open circuit.Therefore, design and develop a kind of novel reliable Current Transformer Secondary side open-circuit protector to monitor effectively and to get rid of this type of fault very necessary.

Look into news from Chinese patent information, existing Current Transformer Secondary side open-circuit-protection technology mainly contains two kinds of technical schemes.The first is utilized the characteristic of zinc oxide component, in case produce high voltage, zinc oxide component short circuit conducting immediately, thus play a protective role; It two is serial connection diode or other semiconductors, and short circuit immediately when the secondary side of current transformer produces high pressure reaches the purpose of protection.But some problem can not solve in these cases, and reason is: (one), secondary circuit be open circuit in a single day, and fault can't be eliminated oneself; (2), primary current fluctuation is big, makes semiconductor element act frequently, and is impaired easily, do not reach the purpose of protection; (3), the protection running-active status of components and parts can't be observed.

The purpose of this utility model is to overcome the deficiency that above-mentioned two kinds of prior aries exist, and fundamentally eliminates the accident potential that Current Transformer Secondary side open circuit brings.

The technical solution of the utility model Current Transformer Secondary side open-circuit protector is: when the Current Transformer Secondary side is opened a way; promptly produce voltage (voltage has a process that progressively raises); the protection coil of protector attracts the spring tripping mechanism when this voltage reaches certain value (several volts or tens volts); the tripping mechanism action makes the contact permanent short, thereby reaches protective effect.In the time of the action of spring tripping mechanism, action of plate button and indication fault on the protector are so that the staff checks and recovers.In addition, can install auxiliary contact additional on the protector, so that remote signal (similar small air circuit breaker) to be provided.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the protection philosophy winding diagram;

Fig. 2 is the protector schematic diagram;

Fig. 3 is a protector profile schematic diagram.

Fig. 1 shows the wiring topology of the utility model protector 1 and current transformer 2.Among the figure 9 is the index signal output.

Fig. 2 and Fig. 3 show the internal structure and the external shape of the utility model protector.When the Current Transformer Secondary side is opened a way, protection coil 3 two ends are influence by voltage, when voltage reaches certain value, protection coil 3 attracts spring tripping mechanism 4,4 actions of spring tripping mechanism make contact 5 permanent shorts, up to human intervention, thereby avoid the harm of high voltage, reach the protection purpose equipment and personnel; Simultaneously, when 4 actions of spring tripping mechanism, plate button 6 moves thereupon, shows the short circuit index signal, is convenient to personnel monitoring, maintenance.In addition, install auxiliary contact 7 on the protector 1 additional, remote signal can be provided, realize remote inspection, monitoring.Structure of the present utility model is identical with small air circuit breaker profile and mounting structure, is installed on the guide rail 8 of standard with other secondary connection terminals.

Claims

1, the utility model relates to a kind of Current Transformer Secondary side open circuit high voltage protection device; it is characterized in that by the protector of protecting coil (3), spring tripping mechanism (4), protection contact (5), fault display panel button (6) and remote signal contact (7) to form; it is outer in parallel with existing Current Transformer Secondary side; when Current Transformer Secondary side open circuit produces high voltage; protection coil (3) attracts spring tripping mechanism (4) thereby makes the short circuit of protection contact (5); form secondary circuit, realize that protection equipment and staff avoid the harm of high voltage.In the time of spring tripping mechanism (4) action, plate button (6) the action indication fault on the protector.In addition, install remote signal contact (7) on the protector additional remote signal can be provided.

2, Current Transformer Secondary side open-circuit protector as claimed in claim 1 is characterized in that having on the shell plate button of distinguishing mark, but and involution; And when spring tripping mechanism (4) moved, fault display panel button (6) was exported index signal thereupon, is convenient to personnel monitoring, maintenance.

3, Current Transformer Secondary side open-circuit protector as claimed in claim 1 is characterized in that spring tripping mechanism (4) action makes protection contact (5) closed permanent, up to human intervention.

4, Current Transformer Secondary side open-circuit protector as claimed in claim 1 is characterized in that installing additional control contact far away (7), and remote signal can be provided.