CN202384744U

CN202384744U - Full-stop protection device for cooler of forced oil-air cooling power transformer

Info

Publication number: CN202384744U
Application number: CN2012200140060U
Authority: CN
Inventors: 聂云瑞; 周波; 于泽军
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-01-03
Filing date: 2012-01-03
Publication date: 2012-08-15
Anticipated expiration: 2022-01-03

Abstract

The utility model relates to a full-stop protection device for a cooler of a forced oil-air cooling power transformer. According to the full-stop protection device for the cooler of the forced oil-air cooling power transformer, the coil of a first current relay 1BSJ and the coil of a second current relay 2BSJ are connected in parallel with each other and then are connected in series with the normally closed contact of a contactor 1C of a power supply of a cooler 1# and the normally closed contact of a contactor 2C of a power supply of a cooler 2#; the normally open contact of the first current relay 1BSJ and the normally open contact of the second current relay 2BSJ are connected in parallel with each other and then are connected in series with the normally open contact of a temperature relay WJ, the coil of a signal relay XJ and the coil of a protection exit relay BCJ; and after the two series loops are arranged between the positive supply +KM and the negative supply -KM of a control power supply of the transformer after being connected in parallel with each other.

Description

Forced-oil-air cooling power transformer cooler full cut-off protective device

One, technical field:

The utility model relates to protection equipment for transformer, what be specifically related to is forced-oil-air cooling power transformer cooler full cut-off protective device.

Two, background technology:

Forced-oil-air cooling power transformer cooler full cut-off protective device be prevent power transformer when the cooler full cut-off because the transformer temperature raises the device of scaling loss transformer.Because the design condition requirement of forced-oil-air cooling power transformer, transformer its cooler that requires in service puts into operation.As shown in Figure 1; Present transformer cooler full cut-off protective device is: behind the first current relay 1BSJ coil and the second current relay 2BSJ coils from parallel connection of coils, connect with the contactor 1C normally closed contact of cooler 1# power supply, the contactor 2C normally closed contact of cooler 2# power supply; After the first current relay 1BSJ normal opened contact, the second current relay 2BSJ normal opened contact parallel connection; Connect with signal relay XJ coil, protection exit relay BCJ coil; After above-mentioned two series loop parallel connections, be mounted on transformer control power supply+KM ,-KM between.When causing cooler 1# power supply and the whole dead electricity of 2# power supply owing to various faults; The contactor 1C normally closed contact of 1# power supply is closed; The contactor 2C normally closed contact of 2# power supply is also closed, and the first current relay 1BSJ coil, the second current relay 2BSJ coil magnetization are after the time-delay of adjusting; The normal opened contact of the first current relay 1BSJ is closed, the normal opened contact of the second current relay 2BSJ is closed; Protection exit relay BCJ coil and signal relay XJ coil be excitation simultaneously, and tripping transformer frequency response switch sends air-cooled power failure signal simultaneously.But in actual motion, especially during parallel operation of transformers, the operating load of transformer is also little; The rising of the temperature of transformer neither be clearly behind the air-cooled full cut-off; The temperature of transformer can not surpass permissible value in the long time, according to present cooler full cut-off protective device requirement, as long as transformer cooler all stops; No matter whether the temperature of transformer surpasses permissible value; Just time-delay is with the transformer frequency response switch trip in order to protect transformer, and interruption is irrational to user's normal power supply.

Three, summary of the invention:

The purpose of the utility model provides forced-oil-air cooling power transformer cooler full cut-off protective device, and this forced-oil-air cooling power transformer cooler full cut-off protective device is used for solving the problem that present transformer cooler full cut-off protective device does not have transformer temperature basis for estimation.

The utility model solves the technical scheme that its technical problem adopted: behind the first current relay 1BSJ coil and the second current relay 2BSJ coils from parallel connection of coils of this forced-oil-air cooling power transformer cooler full cut-off protective device, be cascaded with the contactor 1C normally closed contact of cooler 1# power supply, the contactor 2C normally closed contact of cooler 2# power supply; After the first current relay 1BSJ normal opened contact, the second current relay 2BSJ normal opened contact parallel connection, be cascaded with temperature relay WJ normal opened contact, signal relay XJ coil, protection exit relay BCJ coil; After above-mentioned two series loop parallel connections, be installed in transformer and control between the positive supply+KM of power supply, the negative supply-KM.

Beneficial effect:

The utility model is when the air-cooled power supply full cut-off of forced-oil-air cooling transformer; If the transformer temperature does not also surpass permissible value, temperature relay WJ normal opened contact breaks off, and protection exit relay BCJ coil can't get electric excitation; Cooler full cut-off protective device can not move, and transformer can continue operation.Have only when the air-cooled power supply full cut-off of forced-oil-air cooling transformer, the transformer temperature surpasses permissible value, and temperature relay WJ normal opened contact is connected; Protection exit relay BCJ coil gets electric excitation; Cooler full cut-off protective device just can move, and with the transformer frequency response switch trip, stops the operation of transformer.

Four, description of drawings:

Fig. 1 is the structural representation in existing forced-oil-air cooling power transformer cooler full cut-off protective device loop;

Fig. 2 is the structural representation of the utility model.

Five, embodiment:

Below in conjunction with accompanying drawing the utility model is done further explanation:

As shown in Figure 2, the contactor 1C normally closed contact of the cooler 1# power supply of this forced-oil-air cooling power transformer cooler full cut-off protective device and the contactor 2C normally closed contact of 2# power supply are cascaded with the parallelly connected first current relay 1BSJ coil and the second current relay 2BSJ coil; After the first current relay 1BSJ normal opened contact, the second current relay 2BSJ normal opened contact parallel connection; Connect with temperature relay WJ normal opened contact earlier; And then connect with signal relay XJ coil, protection exit relay BCJ coil; After above-mentioned two series loop parallel connections, be mounted on transformer and control between the positive supply+KM of power supply, the negative supply-KM.

After causing cooler 1# power supply and the whole dead electricity of cooler 2# power supply owing to various faults, when the transformer temperature surpassed permissible value, the contactor 1C normally closed contact of cooler 1# power supply was closed; The contactor 2C normally closed contact of cooler 2# power supply is closed; The first current relay 1BSJ coil magnetization, the second current relay 2BSJ coil magnetization is after the time-delay of adjusting; The normal opened contact of the first current relay 1BSJ is closed; The normal opened contact of the second current relay 2BSJ is closed, and temperature relay WJ normal opened contact is closed, and protection exit relay BCJ coil and signal relay XJ coil be excitation simultaneously; Tripping transformer frequency response switch sends air-cooled power failure signal simultaneously.

Claims

1. forced-oil-air cooling power transformer cooler full cut-off protective device; It is characterized in that: behind the first current relay 1BSJ coil and the second current relay 2BSJ coils from parallel connection of coils of this forced-oil-air cooling power transformer cooler full cut-off protective device, be cascaded with the contactor 1C normally closed contact of cooler 1# power supply, the contactor 2C normally closed contact of cooler 2# power supply; After the first current relay 1BSJ normal opened contact, the second current relay 2BSJ normal opened contact parallel connection, be cascaded with temperature relay WJ normal opened contact, signal relay XJ coil, protection exit relay BCJ coil; After above-mentioned two series loop parallel connections, be installed in transformer and control between the positive supply+KM of power supply, the negative supply-KM.