CN217333152U - Cooler control device - Google Patents

Abstract

The present application relates to a cooler control device. The cooler control device comprises an isolation switch normally closed contact circuit, a first intermediate relay circuit, a first normally open contact circuit and a cooler power supply circuit, wherein the isolation switch normally closed contact circuit comprises a plurality of first normally closed contacts connected in series, the first intermediate relay circuit comprises a plurality of first intermediate relays, the first normally open contact circuit comprises a plurality of first normally open contacts and second intermediate relays connected in series, and the second intermediate relays are connected in series with the plurality of first normally open contacts connected in series; the isolation switch normally closed contact circuit is connected with the first intermediate relay circuit and is used for controlling the opening and closing of the first normally open contact circuit; and the first normally open contact circuit is used for controlling the on-off of the power supply circuit of the cooler. The device can reduce the operation risk.

Description

Cooler control device

Technical Field

The present application relates to the field of electrical power technology, and more particularly, to a cooler control device.

Background

The start and stop of a cooler of a transformer in a nuclear power plant can be influenced by power transmission and power failure of the transformer, the cooler is started when the transformer transmits power, and the cooler is stopped when the transformer fails.

At present, the isolation disconnecting link needs to be manually operated so as to supply power or stop supplying power to the transformer, and then the start and stop of the cooler are controlled according to the state of the extended point intermediate relay. For example, when the isolation switch is switched on, the extension point intermediate relay loses power, so that the cooler is started; when the isolation disconnecting link is opened, the extended point intermediate relay is electrified, so that the cooler stops.

However, when the isolation switch or the extended point intermediate relay is touched by mistake by a person to cause malfunction, the current operation mode has operation risk.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a cooler control device capable of reducing an operation risk in view of the above technical problems.

The present application provides a cooler control device. The cooler control device comprises an isolation switch normally closed contact circuit, a first intermediate relay circuit, a first normally open contact circuit and a cooler power supply circuit, wherein the isolation switch normally closed contact circuit comprises a plurality of first normally closed contacts connected in series, the first intermediate relay circuit comprises a plurality of first intermediate relays, the first normally open contact circuit comprises a plurality of first normally open contacts and second intermediate relays connected in series, and the second intermediate relays are connected in series with the plurality of first normally open contacts connected in series;

the isolation switch normally closed contact circuit is connected with the first intermediate relay circuit and is used for controlling the opening and closing of the first normally open contact circuit;

the first normally open contact circuit is used for controlling the on-off of the power supply circuit of the cooler.

In one embodiment, the isolation switch normally closed contact circuit comprises two first normally closed contacts connected in series, the first intermediate relay circuit comprises two first intermediate relays, and the first normally open contact circuit comprises two first normally open contacts connected in series.

In one embodiment, two of the first intermediate relays are connected in parallel.

In one embodiment, the cooler power supply circuit comprises a master power supply circuit and a slave power supply circuit, and the master power supply circuit and the slave power supply circuit are identical in structure.

In one embodiment, the main power supply circuit comprises a second normally closed contact and a third intermediate relay, the second normally closed contact is connected with the third intermediate relay; the second intermediate relay is used for controlling the opening and closing of the second normally closed contact.

In one embodiment, the main power supply circuit further comprises a second normally open contact, and the third intermediate relay is used for controlling the opening and closing of the second normally open contact.

In one embodiment, the main power supply circuit further includes a third normally closed contact, and the third intermediate relay is disposed between the second normally closed contact and the third normally closed contact.

In one embodiment, the main power supply circuit further includes a third normally open contact connected to the second normally closed contact, and a fourth intermediate relay for controlling opening and closing of the third normally open contact.

In one embodiment, the main power supply circuit further comprises a fourth normally open contact and a main power monitoring device, the fourth normally open contact is connected with the main power monitoring device, and the main power monitoring device is used for controlling the opening and closing of the fourth normally open contact.

In one embodiment, the master power supply circuit is electrically interlocked with the slave power supply circuit.

Above-mentioned cooler controlling means is provided with a plurality of first normally closed contacts, a plurality of first auxiliary relay and a plurality of first normally open contact, and when a plurality of first normally open contacts were whole closed, first normally open contact circuit just can control cooler supply circuit stop work. And when people for the mistake touch isolation switch or expand a little intermediate relay and take place single trouble, also can only make a first normally closed contact among a plurality of first normally closed contacts closed, perhaps, a first intermediate relay among a plurality of first intermediate relays gets electric, and then only can make a first normally open contact closed, under this kind of condition, first normally open contact circuit can not control the disconnection of cooler supply circuit. Therefore, the cooler control device provided by the application can prevent the condition of a single fault caused by mistakenly touching the isolation switch or the spread point intermediate relay through the redundancy of the first normally closed contacts and the first intermediate relays, avoid the problem that the cooler stops working as long as a single fault occurs in the traditional technology, reduce the operation risk and increase the stability of the transformer during operation.

Drawings

FIG. 1 is a schematic circuit diagram of a prior art extended-point intermediate relay;

FIG. 2 is a schematic diagram of a power supply switching circuit of a conventional chiller;

FIG. 3 is a schematic diagram of a main power circuit of a conventional chiller;

FIG. 4 is a schematic diagram of the construction of the chiller control apparatus of the present application;

FIG. 5 is a schematic circuit diagram of a spread-point intermediate relay of the present application;

FIG. 6 is a schematic diagram of the power supply switching circuit of the chiller according to the present application;

FIG. 7 is a schematic diagram of the main power supply circuit of the present application;

fig. 8 is a schematic diagram of a slave power supply circuit in the present application.

Description of reference numerals:

101-isolating disconnecting link auxiliary contact, 102-ZJ1 relay, 201-ZJ1 normally open contact, 202-K relay, 301-Q1 switch, 302-power monitoring device, 303-KMS1 normally open contact, 304-isolating circuit, 305-Q2 switch, 306-KV1 normally open contact, 307-K1 relay, 308-K1 normally open contact, 309-KMS2 normally closed contact, 310-KMS1 relay, 311-K normally closed contact, 501-first normally closed contact, 502-first normally closed contact, 503-first intermediate relay, 504-first intermediate relay, 601-first normally open contact, 602-first normally open contact, 603-second intermediate relay, 701-air switch, 702-main power source detection device, 703-second normally open contact, 704-isolation circuit, 705-air switch, 706-fourth normally open contact, 707-fourth intermediate relay, 708-third normally open contact, 709-third normally closed contact, 710-third intermediate relay, 711-second normally closed contact, 801-air switch, 802-slave power supply detection device, 803-second normally open contact, 804-isolation circuit, 805-air switch, 806-fourth normally open contact, 807-fourth intermediate relay, 808-third normally open contact, 809-third normally closed contact, 810-third intermediate relay, 811-second normally closed contact.

Detailed Description

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The transformer controls the oil temperature through the cooler. At present, the start and stop of a cooler of a transformer in a nuclear power plant can be influenced by power transmission and power failure of the transformer, the cooler starts to work when the transformer transmits power, and the cooler stops working when the transformer fails.

Fig. 1 to 3 are schematic diagrams illustrating an operation manner of a conventional technology, and the conventional technology will be described with reference to fig. 1 to 3.

Fig. 1 is a schematic circuit diagram of a prior art extended-point intermediate relay. Wherein, the isolation switch auxiliary contact 101 is a normally closed contact. When the isolation switch is manually operated to be switched off, the transformer stops power transmission, and the auxiliary contact 101 of the isolation switch is closed; when the isolation switch is manually operated to be switched on, power is supplied to the transformer, and the auxiliary contact 101 of the isolation switch is disconnected.

Further, since the isolation switch auxiliary contact 101 and the ZJ1 relay 102 are connected in series, when the isolation switch is opened, the isolation switch auxiliary contact 101 is closed, and the ZJ1 relay 102 is powered; when the isolation knife switch is switched on, the auxiliary contact 101 of the isolation knife switch is opened, and the ZJ1 relay 102 is powered off. Among them, the ZJ1 relay 102 is a spread point intermediate relay.

Fig. 2 is a schematic diagram of a power supply switching circuit of a conventional chiller. The chiller power on circuit includes a ZJ1 normally open contact 201 and a K relay 202. The power on or off of the ZJ1 relay 102 controls the closing or opening of the ZJ1 normally open contact 201. That is, the normally open contact 201 of the ZJ1 is closed due to the power on of the ZJ1 relay 102, and the normally open contact 201 of the ZJ1 is opened due to the power off of the ZJ1 relay 102. Further, since the normally open contact 201 of ZJ1 and the K relay 202 are connected in series, when the normally open contact 201 of ZJ1 is closed, the K relay 202 is powered; when the normally open contact 201 of ZJ1 opens, the K relay 202 loses power.

Fig. 3 is a schematic diagram of a main power circuit of a conventional cooler. As shown in fig. 3, the Q1 switch 301 and the Q3 switch 305 need to be closed manually, and the power-on or power-off of the K1 relay 307 controls the closing or opening of the K1 normally open contact 308. When the power monitoring device 302 monitors that the power of the cooler is normal, the KV1 normally open contact 306 is closed, and then the K1 relay 307 is electrified, so that the K1 normally open contact 308 is closed due to the electrification of the K1 relay 307.

The KMS2 normally closed contacts are controlled by a slave power circuit (not shown) of the cooler, it being understood that the master and slave power circuits of the cooler are operated in a mutually exclusive manner, and that generally only one of the master or slave power circuits is required to supply power to the cooler. Specifically, the KMS1 normally closed contact 309 is controlled by the operating state of the slave power supply circuit, and the KMS1 normally closed contact 309 is closed when the slave power supply circuit is not required as the power supply side of the cooler, and the KMS1 normally closed contact 309 is opened when the slave power supply circuit is required as the power supply side of the cooler. That is, when the main power circuit of the cooler is required as the power supply of the cooler, the KMS1 normally closed contact 309 is closed.

The K normally closed contact 311 is controlled by the K relay 202 in fig. 2. Specifically, when the K relay 202 is powered on, the K normally closed contact 311 is opened; when the K relay 202 loses power, the K normally closed contact 311 is closed.

The KMS1 normally open contact 303 is controlled by the KMS1 relay 310 relay. Specifically, when the KMS1 relay 310 is powered on, the KMS1 normally open contact 303 is closed; when the KMS1 relay 310 loses power, the KMS1 normally open contact 303 is opened.

Taking the main power circuit as an example of a power supply, in conjunction with fig. 1 to 3, when the isolating switch is manually operated to close, power is supplied to the transformer, and in this case, a cooler needs to be started. Specifically, the isolation switch auxiliary contact 101 is opened, the ZJ1 relay 102 is de-energized, the ZJ1 normally open contact 201 is opened, the K relay 202 is de-energized, and the K normally closed contact 311 is closed. The Q1 switch 301 and the Q3 switch 305 are always in a closed state, under the normal condition, the KV1 normally-open contact 306 is closed, the K1 relay 307 is powered, the K1 normally-open contact 308 is closed, and the KMS1 normally-closed contact 309 is closed, so that the KMS1 relay 310 is powered due to the conduction of the loop where the relay is located. Further, the KMS1 normally open contact 303 is closed by the power on of the KMS1 relay 310, so that the main power circuit of the cooler is activated to power the cooler, i.e., the cooler is activated.

When the isolating knife switch is manually operated to be closed, the power supply of the transformer is stopped, and in this case, the cooler also needs to stop working. Specifically, the isolation switch auxiliary contact 101 is closed, the ZJ1 relay 102 is energized, and further the ZJ1 normally open contact 201 is closed, the K relay 202 is energized, and thus the K normally closed contact 311 is opened. KMS1 relay 310 also loses power due to the opening of its circuit. Further, the KMS1 normally open contact 303 is opened due to a loss of power to the KMS1 relay 310, so that the main power circuit of the cooler is deactivated, that is, the cooler is deactivated.

The principle is the same when the cooler needs to be powered from the power circuit, and the details are not repeated here. That is to say, under normal conditions, in the conventional technology, the isolation switch needs to be manually operated to supply power to the transformer or stop supplying power, and then the start and stop of the cooler are controlled according to the state of the extended-point intermediate relay. However, in the case of a malfunction caused by a human error touching the isolation switch or the extended-point intermediate relay (i.e., the ZJ1 relay 102), the current operation mode has an operation risk.

Specifically, the cooler is normally started and in an operating state, but when the isolating disconnecting link is touched by mistake or the ZJ1 relay 102 is in malfunction and is powered on, the normally open contact 201 of the ZJ1 is closed, and further the K relay 202 is powered on, so that the normally closed contact 311 of the K is opened. The KMS1 relay 310 is also de-energized due to the open circuit, the KMS1 normally open contact is open, the cooler is abnormally stopped, and no alarm is given. Therefore, the oil temperature of the transformer cannot be controlled, and the operation risk of the transformer is increased.

In view of the above, it is necessary to provide a cooler control device in order to solve the above-mentioned technical problems.

Fig. 4 is a schematic structural diagram of a cooler control device according to the present application, and as shown in fig. 4, the cooler control device 400 includes an isolation switch normally closed contact circuit 401, a first intermediate relay circuit 402, a first normally open contact circuit 403, and a cooler power supply circuit 404.

Referring to fig. 5, fig. 5 is a schematic circuit diagram of the extended-point intermediate relay according to the present application. The isolation switch normally closed contact circuit 401 includes a plurality of first normally closed contacts 501 and 502 connected in series, the first intermediate relay circuit 402 includes a plurality of first intermediate relays 503 and 504, the first normally open contact circuit 403 includes a plurality of first normally open contacts 601 and 602 and a second intermediate relay 603 connected in series, and the second intermediate relay 603 is connected in series with the plurality of first normally open contacts 601 and 602 connected in series. It is understood that the present embodiment does not limit the number of the first normally open contact, the first intermediate relay, and the first normally closed contact.

The isolation switch normally closed contact circuit 401 is connected with the first intermediate relay circuit 402, and the isolation switch normally closed contact circuit 401 is used for controlling the opening and closing of the first normally open contact circuit 403.

Specifically, with reference to fig. 5, the first normally closed contact 501 and the first normally closed contact 502 may be controlled by the same isolation switch, for example, when the isolation switch a is opened by manual operation, the first normally closed contact 501 and the first normally closed contact 502 are both closed; when the isolating switch a is manually operated to be switched on, both the first normally closed contact 501 and the first normally closed contact 502 are opened. The first normally closed contact 501 and the first normally closed contact 502 may also be controlled by different isolation switches, for example, when the isolation switch a and the isolation switch B are both opened by manual operation, the first normally closed contact 501 and the first normally closed contact 502 are closed; when the isolating knife switch A and the isolating knife switch B are manually switched on, the first normally closed contact 501 and the first normally closed contact 502 are disconnected.

When the first normally-closed contact 501 and the first normally-closed contact 502 are both closed, the first intermediate relay 503 and the first intermediate relay 504 are both energized; when both the first normally closed contact 501 and the first normally closed contact 502 are opened, both the first intermediate relay 503 and the first intermediate relay 504 lose power.

Fig. 6 is a schematic diagram of a power supply switching circuit of the cooler according to the present application, and as shown in fig. 6, the opening and closing of the first normally open contact 601 is controlled by the first intermediate relay 503. When the first intermediate relay 503 is powered on, the first normally open contact 601 is closed; when the first intermediate relay 503 loses power, the first normally open contact 601 opens. Therefore, the isolation switch normally closed contact circuit 401 can control the opening and closing of the first normally open contact circuit 403.

And a first normally open contact circuit 403 for controlling the on/off of the cooler power supply circuit 404.

Specifically, when both the first normally-closed contact 401 and the first normally-closed contact 402 are closed, the second intermediate relay 603 is energized. The power on and power off of the second intermediate relay 603 can influence the on and off of the cooler power supply circuit, so that the start and stop of the cooler can be controlled. For example, when the second intermediate relay 603 loses power, the cooler power supply circuit is closed, so that the cooler starts to work; when the second intermediate relay 603 is energized, the cooler power supply circuit is disconnected, and the cooler stops operating. Therefore, the first normally open contact circuit 403 can be used to control the switching of the cooler power supply circuit 404.

With reference to fig. 4 to 6, the cooler control device provided by the present application is provided with a plurality of first normally closed contacts 501 to 502, a plurality of first intermediate relays 503 to 504, and a plurality of first normally open contacts 601 to 602, and when the plurality of first normally open contacts 601 and 602 are all closed, the first normally open contact circuit 403 will control the cooler power supply circuit 404 to stop working. When a single fault occurs due to a human error-contact isolating switch or a spread-point intermediate relay, only one first normally-closed contact, for example, the first normally-closed contact 501, of the plurality of first normally-closed contacts is closed, or one first intermediate relay, for example, the first intermediate relay 503, of the plurality of first intermediate relays is powered on, and then only one first normally-open contact, for example, the first normally-open contact 601, is closed. In this case, the first normally open contact circuit 403 does not control the cooler power supply circuit 404 to open. Therefore, the cooler control device that this application provided can prevent through the redundancy of a plurality of first normally closed contacts and a plurality of first auxiliary relay that the mistake from touching the condition of the single trouble that isolation switch or spread a little auxiliary relay and lead to, avoid in the conventional art as long as take place the single trouble and will cause the problem of cooler stop work, reduce the operation risk, stability when increasing transformer operation.

In the present embodiment, the isolation switch normally closed contact circuit 401 includes two first normally closed contacts 501 and 502 connected in series, the first intermediate relay circuit 402 includes two first intermediate relays 503 and 504, and the first normally open contact circuit 403 includes two first normally open contacts 601 and 602 connected in series.

In the present embodiment, two first intermediate relays 503 and 504 are connected in parallel. Therefore, when the isolating knife switch is manually operated to be switched on, the two first intermediate relays 503 and 504 can be powered on and do not affect each other.

In this embodiment, fig. 7 is a schematic diagram of a master power supply circuit in the present application, fig. 8 is a schematic diagram of a slave power supply circuit in the present application, please refer to fig. 7 and fig. 8, the cooler power supply circuit 404 includes a master power supply circuit 700 and a slave power supply circuit 800, and the structures of the master power supply circuit and the slave power supply circuit are the same.

In the present embodiment, the main power supply circuit 700 includes a first normally closed contact 711 and a third intermediate relay 710, and the second normally closed contact 711 is connected to the third intermediate relay 710; the second intermediate relay 603 is used to control the opening and closing of the second normally closed contact 711. Specifically, when the second intermediate relay 603 is powered on, the second normally closed contact 711 is opened; when the second intermediate relay 603 loses power, the second normally closed contact 711 is closed.

In this embodiment, the main power supply circuit 700 further includes a second normally open contact 703, and the third intermediate relay 710 is used to control the opening and closing of the second normally open contact 703. Specifically, when the third intermediate relay 710 is energized, the second normally open contact 703 is closed; when the third intermediate relay 710 loses power, the second normally open contact 703 is opened. As can be seen from fig. 7, when the second normally open contact 703 is closed, the main power supply circuit is turned on and supplies power to the cooler, and the cooler is started to operate; when the second normally open contact 703 is open, the main power supply circuit stops supplying power to the cooler, and the cooler stops operating.

In this embodiment, the main power supply circuit 700 further includes a third normally-closed contact 709, and the third intermediate relay 710 is disposed between the second normally-closed contact 711 and the third normally-closed contact 709.

In this embodiment, the main power supply circuit 700 further includes a third normally-open contact 708 and a fourth intermediate relay 707, the third normally-open contact 708 is connected to the third normally-closed contact 709, and the fourth intermediate relay 707 is used to control the opening and closing of the third normally-open contact 708. Specifically, the third normally open contact 708 is closed when the fourth intermediate relay 707 is energized, and the third normally open contact 708 is open when the fourth intermediate relay 707 is de-energized.

In this embodiment, the main power supply circuit 700 further includes a fourth normally open contact 706 and a main power monitoring device 702, the fourth normally open contact 706 is connected to the main power monitoring device 702, and the main power monitoring device 702 is configured to control opening and closing of the fourth normally open contact 706. It can be understood that the main power source monitoring device 702 can monitor the state of the main power source, and when the main power source is normal, the fourth normally open contact 706 is closed; when the primary power source is abnormal, the fourth normally open contact 706 is open.

In the present embodiment, the main power supply circuit 700 includes an air switch 701, an air switch 705, and a disconnector 704, and the air switch 701 and the air switch 705 are closed by a human operation by default. The isolating switch is used for electric isolation, and mutual interference among different circuits is reduced. 1L1 ~ 1L3 respectively represent the ground wire, zero line, live wire of one section of power supply and two sections of power supply.

The slave power supply circuit 800 comprises an air switch 801, a slave power supply detection device 802, second normally open contacts 803 and 804-an isolation circuit, an air switch 805, a fourth normally open contact 806, a fourth intermediate relay 807, a third normally open contact 808, a third normally closed contact 809, a third intermediate relay 810 and a second normally closed contact 811, and the slave power supply circuit and the master power supply circuit have the same structure and are not described again.

In this embodiment, the master power supply circuit 700 is electrically interlocked with the slave power supply circuit 800.

It will be appreciated that generally only one of the master power supply circuit 700 or the slave power supply circuit 800 is required to provide power to the chiller as a power supply, and that the electrical interlock is used to achieve mutual exclusion between the master power supply circuit 700 and the slave power supply circuit 800.

Specifically, the third normally closed contact 709 of the master power supply circuit 700 is controlled by a third intermediate relay 810 in the slave power supply circuit 800. When the slave power supply circuit 800 is closed or the slave power supply circuit 800 is required to serve as a power supply side of the cooler, the third intermediate relay 810 is energized, and the third normally-closed contact 709 is opened, so that the master power supply circuit cannot be closed, and vice versa. The third normally closed contact 809 of the slave power supply circuit 800 is controlled by the third intermediate relay 710 in the master power supply circuit 700, specifically, when the master power supply circuit 700 is closed or the master power supply circuit 700 is required to be used as a power supply of a cooler, the third intermediate relay 710 is powered on, and further the third normally closed contact 709 is disconnected, so that the slave power supply circuit cannot be closed, and vice versa. Thus, the master power supply circuit 700 is electrically interlocked with the slave power supply circuit 800. It will be appreciated that the third normally closed contact 709 is closed by default when the main power circuit 700 is required to power the chiller. When the power supply from the power supply circuit 800 is required as the power supply side of the cooler, the third normally closed contact 809 is closed by default.

With reference to fig. 4 to fig. 8, a main power supply circuit 700 is taken as an example of a power supply of a cooler. The main power supply circuit 700 normally has the air switch 701, the air switches 705, 706, and 709 closed.

When the isolating switch is manually operated to be switched on, the first normally closed contact 501 and the first normally closed contact 502 are both opened, and then the first intermediate relay 503 and the first intermediate relay 504 are powered off, so that the first normally open contact 601 and the first normally open contact 602 are both powered off, and the second intermediate relay 603 is powered off. The fourth intermediate relay 707 is energized due to conduction of the circuit, and the third normally open contact 708 is closed due to energization of the fourth intermediate relay 707. Due to the loss of power of the second intermediate relay 603, the second normally closed contact 711 is closed, so that the third intermediate relay 710 is powered on, and the second normally open contact 703 is closed due to the power on of the third intermediate relay 710, so that the cooler starts to work.

When the isolating disconnecting link is opened by manual operation, the first normally closed contact 501 and the first normally closed contact 502 are both closed, and then the first intermediate relay 503 and the first intermediate relay 504 are powered on, so that the first normally open contact 601 and the first normally open contact 602 are both closed, and the second intermediate relay 603 is powered on. Due to the loss of power to the second intermediate relay 603, the second normally closed contact 711 is opened, and therefore, the third intermediate relay 710 is lost, and the second normally open contact 703 is opened due to the loss of power to the third intermediate relay 710, and the cooler stops operating.

In the cooler controlling means that this application provided, even the condition of the single trouble that the mistake touched isolation switch or expanded point auxiliary relay leads to appears, for example the mistake touches isolation switch A and leads to first normally closed contact 501 closed, or first auxiliary relay 503 breaks down and gets electric, 601 and 602 can not be closed simultaneously, thereby also can not make second auxiliary relay 603 get electric cooler stop work, thereby prevent the mistake and touch the condition of the single trouble that isolation switch or expanded point auxiliary relay lead to, avoid causing the problem of cooler stop work, reduce the operation risk, increase transformer operation stability.

Further, the cooler control apparatus in the present application can reuse elements in the conventional art. For example, the first normally closed contact 501 is multiplexed with the isolation switch auxiliary contact 101, the first intermediate relay is multiplexed with the ZJ1 relay 102, the first normally open contact 601 is multiplexed with the ZJ1 normally open contact 201, and the second intermediate relay 603 is multiplexed with the K relay 202. The cooler control device in the application is simple in improvement compared with the traditional technology, low in cost, strong in practicability and does not influence other functions in the traditional technology.

It should be noted that, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (10)

1. A cooler control device is characterized by comprising an isolation switch normally closed contact circuit, a first intermediate relay circuit, a first normally open contact circuit and a cooler power supply circuit, wherein the isolation switch normally closed contact circuit comprises a plurality of first normally closed contacts connected in series, the first intermediate relay circuit comprises a plurality of first intermediate relays, the first normally open contact circuit comprises a plurality of first normally open contacts and second intermediate relays connected in series, and the second intermediate relays are connected with the plurality of first normally open contacts connected in series;

the isolation switch normally closed contact circuit is connected with the first intermediate relay circuit and is used for controlling the opening and closing of the first normally open contact circuit;

and the first normally open contact circuit is used for controlling the on-off of the power supply circuit of the cooler.

2. The cooler control device according to claim 1, wherein the isolating switch normally closed contact circuit includes two of the first normally closed contacts connected in series, the first intermediate relay circuit includes two of the first intermediate relays, and the first normally open contact circuit includes two of the first normally open contacts connected in series.

3. The cooler control device according to claim 2, characterized in that two of the first intermediate relays are connected in parallel.

4. The cooler control device according to claim 1, characterized in that the cooler power supply circuit includes a master power supply circuit and a slave power supply circuit, and the master power supply circuit and the slave power supply circuit are identical in structure.

5. The cooler control device according to claim 4, characterized in that the main power supply circuit includes a second normally-closed contact and a third intermediate relay, the second normally-closed contact being connected with the third intermediate relay; and the second intermediate relay is used for controlling the opening and closing of the second normally closed contact.

6. The cooler control device according to claim 5, wherein the main power supply circuit further includes a second normally open contact, and the third intermediate relay is configured to control opening and closing of the second normally open contact.

7. The cooler control device according to claim 6, characterized in that the main power supply circuit further includes a third normally-closed contact, and the third intermediate relay is provided between the second normally-closed contact and the third normally-closed contact.

8. The cooler control device according to claim 7, wherein the main power supply circuit further includes a third normally-open contact connected to the third normally-closed contact, and a fourth intermediate relay for controlling opening and closing of the third normally-open contact.

9. The cooler control device according to claim 8, wherein the main power supply circuit further comprises a fourth normally open contact and a main power source monitoring device, the fourth normally open contact is connected with the main power source monitoring device, and the main power source monitoring device is used for controlling opening and closing of the fourth normally open contact.

10. The chiller control device of any of claims 4-9, wherein the master power supply circuit is electrically interlocked with the slave power supply circuit.

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