CN2938530Y

CN2938530Y - Air-cooled control cabinet of converting station

Info

Publication number: CN2938530Y
Application number: CNU2006200928016U
Authority: CN
Inventors: 姜学忠; 王世阁
Original assignee: SHENYANG DONGDIAN POWER EQUIPMENT CO Ltd
Current assignee: SHENYANG DONGDIAN POWER EQUIPMENT CO Ltd
Priority date: 2006-08-15
Filing date: 2006-08-15
Publication date: 2007-08-22
Anticipated expiration: 2016-08-15

Abstract

The utility model relates to a substation air-cooled control cabinet, which is composed of the power supply sets I, II and a control circuit built up from a power supply select circuit and a cooler control circuit. The control loop of the power supply select circuit in the utility model is provide with an automatic switching circuit, wherein the coil of time relay KT1 in series connection with the normal closed contact KMS1 is linked to the operating handle 6, and the coil of time relay KT2 in series connection with the normal closed contact KMS2 is linked to the operating handle 4. The normal open contacts of KT1 and KT2 are respectively in parallel connection on both ends of the normal closed contacts K1 and K2. A phase protective circuit is also provided between the two sets of power supply and the power supply select circuit, in which every phase incoming power supply is respectively connected to the capacitors C1-C3 and C4-C6, and the star contact is linked to the input end of a silicon bridge. The silicon bridge respectively connected to the DC relays KV1 and KV2 is linked to the N terminal. With practical and reliable operation, the utility model is energy saving with long service life, which is much safer with easy maintenance.

Description

The air-cooled control cubicle of transformer station

Technical field

The utility model relates to a kind of affiliated facility of transformer station, relates in particular to the air-cooled control cubicle of a kind of transformer station.It is the air-cooled facility of transformer station's first-selection.

Background technology

Air-cooled control cubicle is the indispensable auxiliary device of high-power transformer, particularly Yan Re south and the north summer, air-cooled control cubicle is guaranteed the indispensable supporting auxiliary device of the normal operation of transformer especially, thereby visible air-cooled control cubicle had once been brought into play positive effect in the development electric utility.Yet however, in the past for many years in the practice operation because its Circuit Design is unreasonable, and cause existing the following defective not fully up to expectations, be further improved:

1, certain element breaks down or when damaging, the two-way power supply can not be realized automaticallying switch in the control system.When working power I moves, KMS1 work, KMS2 is standby.If when damage of KMS1 coil or the loose contact of KMS2 normally closed contact, the two-way power supply should automatically switch, promptly KMS2 drops into, and guarantees that cooler normally moves.Yet this moment, the normally closed contact in KMS2 loop was opened, and makes power supply II can't constitute the loop because K1 coil excitation, and KMS2 can not excitation, causes cooler two-way power supply to lose the cooler full cut-off.The same power supply II of working as moves, and the problems referred to above occur, and power supply I can not drop into automatically.

2, when power supply appearance one is opened circuit mutually, cause the situation of motor burning to happen occasionally.Carry out open phase protection with two auxiliary relay KV1 and KV2 in the former control loop; yet occurring one as power supply in blower fan, oil pump running opens circuit mutually; because of just being in operation, its motor can produce certain back-emf; cause the auxiliary relay can not loss of excitation; the motor two-phase operation, the result burns motor.

3, when north of china in winter temperature is very low, always wish oil pump operation and under the situation that blower fan is stopped transport transformer still can under suitable temperature, move.Realized and before the blower fan general supply, added an air circuit QB in the past.Though blower fan stops, KM11 remains and is in attracting state, and the contactor that makes its work of drive is also in work, still in consumes energy and waste useful life.

4, in whole cooling system, if when certain being arranged or having the part cooler to break down, and remaining cooler also will work on, and it is very difficult making the trouble shooting cooler, if do not note also taking place easily skill peace accident slightly.

Based on above-mentioned situation, although cause the serious concerns of related scientific research unit and manufacturer already, up to the present do not see successfully the report that solves regrettably as yet, make that the user has no way out day by day, using till today year after year.

The utility model content

The utility model is at above-mentioned problems of the prior art; if provide a kind of in control system certain element break down or can auto switching electric source when damaging, open phase protection, save the energy, easy access, guarantee maintenance personal's safety, the cooling system operation is more reliable flexibly and adapt to the air-cooled control cubicle of the transformer station that moves under the various conditions.

To achieve these goals, the technical solution of the utility model is as follows:

Form by the control circuit that I, II group power supply, power selection circuit and cooler control circuit constitute, it also is provided with an automatic switch-over circuit in the control loop of power selection circuit, wherein the coil of time relay KT1 with connect operating handle 6, KT2 coil after the KMS1 normally closed contact is connected and connect operating handle 4 after the KMS2 normally closed contact is connected, the normal opened contact of KT1, KT2 is attempted by the two ends of K1, K2 normally closed contact respectively; Also establish an open-phase protection circuit between described two groups of power supplys and the power selection circuit; it inserts a capacitor C 1-C3 respectively on every phase incoming power; C4-C6, its mixed asterism connects the input of silicon bridge, connects respectively in the silicon bridge behind a direct current relay KV1, the KV2 to link to each other with the N end.

Also be provided with an air circuit ZK1 in the control loop of described cooler control circuit, one of them normal opened contact one end is plugged between FC1 and the KM1 coil, the normally closed contact of ZK1 is attempted by the two ends of the normal opened contact of KM11, and another normal opened contact one end links to each other with the normally closed contact of KM11, and the other end is plugged on the handle 1.

Also be provided with the air circuit QZ of being convenient to modular repair between described I, the II group power supply, its capacity is 1/2 of KMS1 or KMS2.

The utility model has the advantages of as follows:

The utility model compared with prior art; owing in the control loop of former power selection circuit, set up an automatic switch-over circuit; between two groups of power supplys and power selection circuit, set up an open-phase protection circuit and be convenient to the air circuit QZ of modular repair; and in the control loop of cooler control circuit, set up one be convenient to that north of china in winter stops a series of technical measures such as air circuit of blower motor and through evidence its to have a cooling system operation more reliable flexibly, save the energy; increase the service life; be convenient to keep in repair drawback safer and that elimination is burnt motor because of phase shortage.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is a schematic block circuit diagram of the present utility model.

Embodiment

Embodiment of the present utility model is described in detail in conjunction with the accompanying drawings, the control circuit of air-cooled control cubicle as shown in Figure 1, 2 comprises I, II group power supply, power selection circuit, between is provided with open-phase protection circuit, be connected in series the capacitor C 1-C6 of a 1uF/630V on its every phase incoming power respectively, mixed asterism at C1-C3 and C4-C6 connects the silicon bridge input, and silicon bridge links to each other with the N end of power selection circuit after inserting a direct current relay KV1, KV2 respectively; In the control loop of power selection circuit, set up an automatic switch-over circuit, wherein the coil of time relay KT1 with connect operating handle 6 after the KMS1 normally closed contact is connected in series, another termination N end, the coil of KT2 with connect operating handle 4 after the KMS2 normally closed contact is connected, another termination N end, the two ends of the normal opened contact of KT1 are attempted by the two ends of the normally closed contact of K1, and the normal opened contact of KT2 is attempted by the two ends of K2 normally closed contact; Also be provided with the air circuit QZ of being convenient to modular repair between described I, the II group power supply, its capacity is 1/2 of KMS1 or a KMS2 capacity.Also be provided with an air circuit ZK1 in the control loop of cooler control circuit, one of them normal opened contact one end is plugged between FC1 and the KM1 coil, the normally closed contact of ZK1 is attempted by the two ends of the normal opened contact of KM11, and another normal opened contact one end links to each other with the normally closed contact of KM11, and the other end is plugged on the handle 1.

When the utility model uses as under the situation of power supply I operation, KMS1 damages, its normally closed contact closure, this moment the KT1 relay excitation, normal opened contact closure after delaying time, K2 relay excitation, its normal opened contact closure, connect the KMS2 wire loop, stand-by power supply II puts into operation automatically, guarantees that cooling system normally moves; When breaking down if any a cross streams power supply in running, then producing the 50-60V alternating voltage between neutral point and the ground, is 30V left and right sides direct voltage through rectification, make direct current relay KV excitation, normally closed contact is opened, K1 or K2 relay loss of excitation, the normal battle opened, the general supply of excision phase shortage; As cooler when breaking down, and whole cooling system can not full cut-off, this moment air circuit QZ is disconnected and just can realize that the part cooler overhauls; As at north of china in winter, because temperature is lower, though main transformer work, temperature can not surpass set point of temperature, so the time wish that fan electromotor do not work not only energy-conservation but also can prolong its useful life, when air circuit ZK1 is disconnected, drive the A.C. contactor loss of excitation of fan electromotor work, fan electromotor shuts down, and ZK1's is normally closed closed, make indicator light normally luminous, and Oil pump electrical machinery runs well, guarantee oil normal circulation in pipeline.

Claims

1, the air-cooled control cubicle of transformer station, form by the control circuit that I, II group power supply, power selection circuit and cooler control circuit constitute, it is characterized in that in the control loop of power selection circuit, also being provided with an automatic switch-over circuit, wherein the coil of time relay KT1 with connect after the KMS1 normally closed contact is connected operating handle 6., the KT2 coil with connect after the KMS2 normally closed contact is connected operating handle 4. the normal opened contact of KT1, KT2 be attempted by the two ends of K1, K2 normally closed contact respectively; Also establish an open-phase protection circuit between described two groups of power supplys and the power selection circuit; it inserts a capacitor C 1-C3 respectively on every phase incoming power; C4-C6, its star contact connects the input of silicon bridge, connects respectively in the silicon bridge behind a direct current relay KV1, the KV2 to link to each other with the N end.

2, the air-cooled control cubicle of transformer station according to claim 1, it is characterized in that also being provided with an air circuit ZK1 in the control loop of described cooler control circuit, one of them normal opened contact one end is plugged between FC1 and the KM1 coil, the normally closed contact of ZK1 is attempted by the two ends of the normal opened contact of KM11, and another normal opened contact one end links to each other with the normally closed contact of KM11, and the other end is plugged on handle and 1. goes up.

3, the air-cooled control cubicle of transformer station according to claim 1 is characterized in that also being provided with the air circuit QZ of being convenient to modular repair between described I, the II group power supply, and its capacity is 1/2 of KMS1 or a KMS2 capacity.