CN103595055B - The control method of two transformer separate unit running state conversions in dual transformer system - Google Patents
The control method of two transformer separate unit running state conversions in dual transformer system Download PDFInfo
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Abstract
The invention discloses the control method of two transformer separate unit running state conversions in a kind of dual transformer system, by controlling the first primary cut-out C1 of dual transformer electric power system, second primary cut-out C2, first low-voltage circuit breaker 1DL, second low-voltage circuit breaker 2DL and the 3rd low-voltage circuit breaker 3DL etc. are at opening and closing state, thus control dual transformer electric power system is changed between T1 and T2 isolated operation state separately, and according to the status monitoring of dual transformer electric power system, adjustment dual transformer electric power system makes it can be in all the time in most economical running status, reach energy-conservation object.The control method of two transformer separate unit running state conversions in dual transformer system of the present invention, has after can making dual transformer electric power system power transmission and can run under the operational mode of maximum energy-saving, simplely can realize the advantages such as energy-conservation object.
Description
Technical field
The present invention relates to the control method of two transformer separate unit running state conversions in a kind of dual transformer system.
Background technology
For the supplying electricity and power distribution room of larger enterprise, factories and miness, according to load needs, 2 and above transformer are installed, to ensure power supply reliability.Low-voltage power supply usually adopts bus and connects mode, and normal operational mode is that every platform transformer is independently-powered, and every platform transformer is according to its part throttle characteristics, and low year rate, no-load ratio are higher.According to field survey statistics, the transformer energy loss caused because of low year rate and no-load ratio accounts for 15.6% of monthly actual power consumption.Transformer is in operation, if daily load increase and decrease is very large or load is that cyclic variation is very large, should adjusts the transformer number of units put into operation in time, take rational way of economic operation, to obtain good economic benefit.Such as: when 2 transformers can realize split operation, when whole system load drops to certain value, can meet the demands by 1 transformer-supplied; When system loading rises to certain value, enable 2 and above transformer and power simultaneously and just can meet the demands.Input and the excision work of transformer are commanded automatically by automatic control equipment, and the changes of operating modes of transformer just relates to the switching of control switch, need by automatic control system, multiple stage transformer is participated in power supply in most economical mode, distribution system energy-saving automatic could be realized.
In prior art, to the switching of transformer normal operating mode, normal conditions are load parameter according to instrument measurement or the actual load equipment put into operation, in conjunction with transformer economic operation condition, judged by staff, output operation order, then realize manual switchover by a series of grid switching operation, to reach energy-conservation object.This traditional Artificial Control method has many deficiencies:
(1) because parallel operation of transformers has strict condition restriction, and the impact of many objective factors is subject to by the accuracy of artificial judgment, as error, error in reading, time error, some unavoidable reasons such as electrical equipment action error and staff's professional standards of instrument itself, causing can not switching transformer timely and accurately, do not reach the object of economical operation, even there is the phenomenon of misoperation because of error in judgement, bring hidden danger to the safety of personnel and equipment;
(2) this control model of manual hand manipulation needs operator on duty to participate in the overall process, and hinders the development of unattended operation transformer and distribution power station, makes transformation and distribution system be difficult to accomplish real automation.
Summary of the invention
The present invention is for avoiding the weak point that exists in above-mentioned prior art, providing the control method of two transformer separate unit running state conversions in a kind of dual transformer system, can run to make dual transformer electric power system under the operational mode of maximum energy-saving.
The present invention be technical solution problem by the following technical solutions.
The control method of two transformer separate unit running state conversions in dual transformer system, be characterized in, dual transformer electric power system comprises 10KV bus, the first primary cut-out C1, the second primary cut-out C2, a 500kVA transformer T1, the 2nd 500kVA transformer T2, the first low-voltage circuit breaker 1DL, the second low-voltage circuit breaker 2DL and the 3rd low-voltage circuit breaker 3DL, 0.4kV I section of bus and 0.4kV II section of bus; Be connected by the first primary cut-out C1 between described 10KV bus and a 500kVA transformer T1, be connected by the second primary cut-out C2 between described 10KV bus and the 2nd 500kVA transformer T2; Be connected by the first low-voltage circuit breaker 1DL between described 0.4kV I section of bus and a 500kVA transformer T1, be connected by the second low-voltage circuit breaker 2DL between described 0.4kV II section of bus and the 2nd 500kVA transformer T2; Be connected by the 3rd low-voltage circuit breaker 3DL between described 0.4kV I section of bus and described 0.4kV II section of bus;
Dual transformer electric power system has four kinds of running statuses: a 500kVA transformer T1 isolated operation state, the 2nd 500kVA transformer T2 isolated operation state, two transformer split operation states and two parallel operation of transformers states; Running state parameter in dual transformer electric power system comprises: stop transport for the last time cumulative time TM1, the accumulated running time M2 of the 2nd 500kVA transformer T2, the 2nd 500kVA transformer T2 of the accumulated running time M1 of a 500kVA transformer T1, a 500kVA transformer T1 stops transport cumulative time TM2, the preferential transformer MB run for the last time;
Wherein, the accumulated running time M1 of a 500kVA transformer T1;
One 500kVA transformer T1 stops transport the last idle time ST1 of cumulative time TM1=current time-T1 for the last time;
The accumulated running time M2 of the 2nd 500kVA transformer T2;
2nd 500kVA transformer T2 stops transport the last idle time ST2 of cumulative time TM2=current time-T2 for the last time;
The transformer identity MB of preferential operation: default value is 1, represents preferential and runs a 500kVA transformer T1, span 1 or 2;
In dual transformer system, the control method of two transformer separate unit running state conversions comprises a 500kVA transformer T1 isolated operation state to the transfer process of the 2nd 500kVA transformer T2 isolated operation state and the 2nd 500kVA transformer T2 isolated operation state to the transfer process of a 500kVA transformer T1 isolated operation state;
When M1> accumulated running time, the PT scheduled time of a 500kVA transformer T1 or the 2nd 500kVA transformer T2 stops transport TM2> cumulative time, the PT scheduled time for the last time, electric power system is from a 500kVA transformer T1 isolated operation state to the 2nd 500kVA transformer T2 isolated operation State Transferring; Default scheduled time PT is generally no more than 15 days, generally scheduled time PT is set to 10 days;
One 500kVA transformer T1 isolated operation state to the transfer process of the 2nd 500kVA transformer T2 isolated operation state is:
Step 101: electric power system sends to the second primary cut-out C2 order of closing a floodgate, and the second primary cut-out C2 closes a floodgate successfully and carry out step 102;
Step 102: electric power system sends to the second low-voltage circuit breaker 2DL order of closing a floodgate, and the second low-voltage circuit breaker 2DL closes a floodgate successfully and carry out step 103;
Step 103: electric power system sends separating brake order to the first low-voltage circuit breaker 1DL, carry out step 104 after the first low-voltage circuit breaker 1DL separating brake success;
Step 104: electric power system sends separating brake order to the first primary cut-out C1, carry out step 105 after the first primary cut-out C1 separating brake success;
Step 105: so far, electric power system successful switch to the 2nd 500kVA transformer T2 isolated operation state; According to the total load situation of two transformers, electric power system judges whether current operating conditions is optimum economical operation state; If current operating conditions is optimum economical operation state, keep current operation running status, and start to carry out economical operation status monitoring; If current operating conditions is not optimum economical operation state, then switch from the state that trend is most economical;
When M2> accumulated running time, the PT scheduled time of a 2nd 500kVA transformer T2 or 500kVA transformer T1 stops transport TM1> cumulative time, the PT scheduled time for the last time, electric power system is from the 2nd 500kVA transformer T2 isolated operation state to a 500kVA transformer T1 isolated operation State Transferring;
2nd 500kVA transformer T2 isolated operation state to the transfer process of a 500kVA transformer T1 isolated operation state is:
Step 201: electric power system sends to the first primary cut-out C1 order of closing a floodgate, and the first primary cut-out C1 closes a floodgate successfully and carry out step 202;
Step 202: electric power system sends to the first low-voltage circuit breaker 1DL order of closing a floodgate, and the first low-voltage circuit breaker 1DL closes a floodgate successfully and carry out step 203;
Step 203: electric power system sends separating brake order to the second low-voltage circuit breaker 2DL, carry out step 204 after the second low-voltage circuit breaker 2DL separating brake success;
Step 204: electric power system sends separating brake order to the second primary cut-out C2, carry out step 205 after the second primary cut-out C2 separating brake success;
Step 205: so far, electric power system successful switch to a 500kVA transformer T1 isolated operation state; According to the total load situation of two transformers, electric power system judges whether current operating conditions is optimum economical operation state; If current operating conditions is optimum economical operation state, keep current operation running status, and start to carry out economical operation status monitoring; If current operating conditions is not optimum economical operation state, then switch from the state that trend is most economical.
In dual transformer system of the present invention, the design feature of the control method of two transformer separate unit running state conversions is also:
In described step 101, after electric power system sends to the second primary cut-out C2 order of closing a floodgate, judge whether the second primary cut-out C2 closes a floodgate successfully according to the on off state of the second primary cut-out C2 again, if the second primary cut-out C2 closes a floodgate successfully, then automatically enter step 102; If the second primary cut-out C2 closes a floodgate unsuccessful, then system sends to the second primary cut-out C2 order of once closing a floodgate again, if the second primary cut-out C2 closes a floodgate successfully, then automatically enters step 102; If the second primary cut-out C2 closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 102, after electric power system sends to the second low-voltage circuit breaker 2DL order of closing a floodgate, judge whether the second low-voltage circuit breaker 2DL closes a floodgate successfully according to the on off state of the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL closes a floodgate successfully, then automatically enter step 103; If the second low-voltage circuit breaker 2DL closes a floodgate unsuccessful, then system sends to the second low-voltage circuit breaker 2DL order of once closing a floodgate again, if the second low-voltage circuit breaker 2DL closes a floodgate successfully, then automatically enters step 103; If the second low-voltage circuit breaker 2DL closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 103, after electric power system sends separating brake order to the first low-voltage circuit breaker 1DL, whether separating brake is successful to judge the first low-voltage circuit breaker 1DL according to the on off state of the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL separating brake success, then automatically enters step 104; If the first low-voltage circuit breaker 1DL separating brake is unsuccessful, then system sends a separating brake order to the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL separating brake success, then automatically enters step 104; If the first low-voltage circuit breaker 1DL separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 104, after electric power system sends separating brake order to the first primary cut-out C1, more whether separating brake is successful to judge the first primary cut-out C1 according to the on off state of the first primary cut-out C1; If the first primary cut-out C1 separating brake success, then enter step 105 automatically; If the first primary cut-out C1 separating brake is unsuccessful, then system sends a separating brake order to the first primary cut-out C1 again, if the first primary cut-out C1 separating brake success, then automatically enters step 105; If the first primary cut-out C1 separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 201, after electric power system sends to the first primary cut-out C1 order of closing a floodgate, then judge whether the first primary cut-out C1 closes a floodgate successfully according to the on off state of the first primary cut-out C1; If the first primary cut-out C1 closes a floodgate successfully, then automatically enter step 202; If the first primary cut-out C1 closes a floodgate unsuccessful, then system sends to the first primary cut-out C1 order of once closing a floodgate again, if the first primary cut-out C1 closes a floodgate successfully, then automatically enters step 202; If the first primary cut-out C1 closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 202, after electric power system sends to the first low-voltage circuit breaker 1DL order of closing a floodgate, judge whether the first low-voltage circuit breaker 1DL closes a floodgate successfully according to the on off state of the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL closes a floodgate successfully, then automatically enter step 203; If the first low-voltage circuit breaker 1DL closes a floodgate unsuccessful, then system sends to the first low-voltage circuit breaker 1DL order of once closing a floodgate again, if the first low-voltage circuit breaker 1DL closes a floodgate successfully, then automatically enters step 203; If the first low-voltage circuit breaker 1DL closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 203, after electric power system sends separating brake order to the second low-voltage circuit breaker 2DL, whether separating brake is successful to judge the second low-voltage circuit breaker 2DL according to the on off state of the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL separating brake success, then automatically enters step 204; If the second low-voltage circuit breaker 2DL separating brake is unsuccessful, then system sends a separating brake order to the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL separating brake success, then automatically enters step 204; If the second low-voltage circuit breaker 2DL separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 204, after electric power system sends separating brake order to the second primary cut-out C2, whether separating brake is successful to judge the second primary cut-out C2 according to the on off state of the second primary cut-out C2 again, if the second primary cut-out C2 separating brake success, then automatically enters step 205; If the second primary cut-out C2 separating brake is unsuccessful, then system sends a separating brake order to the second primary cut-out C2 again, if the second primary cut-out C2 separating brake success, then automatically enters step 205; If the second primary cut-out C2 separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The control method of two transformer separate unit running state conversions in dual transformer system of the present invention, by controlling the first primary cut-out C1 of dual transformer electric power system, second primary cut-out C2, first low-voltage circuit breaker 1DL, second low-voltage circuit breaker 2DL and the 3rd low-voltage circuit breaker 3DL etc. are at opening and closing state, thus control dual transformer electric power system is mutually changed between T1 isolated operation and T2 isolated operation state, and according to the status monitoring of dual transformer electric power system, adjustment dual transformer electric power system makes it can be in all the time in most economical running status, reach energy-conservation object.Control method is simple, reaches the operational mode of control and maximum energy-saving automatically on the spot, saves electric energy.By switching manipulation, reasonably optimizing is selected transformer to drop into and is exited, and makes electric power system be in economic operation model all the time.
The control method of two transformer separate unit running state conversions in dual transformer system of the present invention, has after can making dual transformer electric power system power transmission and can run under the operational mode of maximum energy-saving, simplely can realize the advantages such as energy-conservation object.
Accompanying drawing explanation
Fig. 1 be in control method of the present invention T1 separate unit running state conversion to the control flow chart of T2 separate unit running status.
Fig. 2 be in control method of the present invention T2 separate unit running state conversion to the control flow chart of T1 separate unit running status.
Fig. 3 is the hardware connection figure of dual transformer electric power system in control method of the present invention.
Below by way of embodiment, and the invention will be further described by reference to the accompanying drawings.
Embodiment
See accompanying drawing 1 ~ Fig. 3, the control method of two transformer separate unit running state conversions in dual transformer system, it is characterized in that, as shown in Figure 3, dual transformer electric power system comprises 10KV bus, the first primary cut-out C1, the second primary cut-out C2, a 500kVA transformer T1, the 2nd 500kVA transformer T2, the first low-voltage circuit breaker 1DL, the second low-voltage circuit breaker 2DL and the 3rd low-voltage circuit breaker 3DL, 0.4kV I section of bus and 0.4kV II section of bus; Be connected by the first primary cut-out C1 between described 10KV bus and a 500kVA transformer T1, be connected by the second primary cut-out C2 between described 10KV bus and the 2nd 500kVA transformer T2; Be connected by the first low-voltage circuit breaker 1DL between described 0.4kV I section of bus and a 500kVA transformer T1, be connected by the second low-voltage circuit breaker 2DL between described 0.4kV II section of bus and the 2nd 500kVA transformer T2; Be connected by the 3rd low-voltage circuit breaker 3DL between described 0.4kV I section of bus and described 0.4kV II section of bus;
Dual transformer electric power system has four kinds of running statuses: a 500kVA transformer T1 isolated operation state, the 2nd 500kVA transformer T2 isolated operation state, two transformer split operation states and two parallel operation of transformers states; Running state parameter in dual transformer electric power system comprises: stop transport for the last time cumulative time TM1, the accumulated running time M2 of the 2nd 500kVA transformer T2, the 2nd 500kVA transformer T2 of the accumulated running time M1 of a 500kVA transformer T1, a 500kVA transformer T1 stops transport cumulative time TM2, the preferential transformer MB run for the last time;
Wherein, the accumulated running time M1 of a 500kVA transformer T1;
One 500kVA transformer T1 stops transport the last idle time ST1 of cumulative time TM1=current time-T1 for the last time;
The accumulated running time M2 of the 2nd 500kVA transformer T2;
2nd 500kVA transformer T2 stops transport the last idle time ST2 of cumulative time TM2=current time-T2 for the last time;
The transformer identity MB of preferential operation: default value is 1, represents preferential and runs a 500kVA transformer T1, span 1 or 2;
During concrete enforcement, need the voltage of detection two station power distribution transformer, electric current, meritorious, idle, high-low pressure both sides on off state, low-pressure side bus connection switch state.According to transformer actual motion state, relevant protection device information, in order to judge that distribution transformer whether can normal switching, if can not normal switching, give a warning information, and automatically process as required, makes switch reach switching condition.
(1) the one 500kVA transformer T1 isolated operation: now, C1,1DL and 3DL are in "on" position, C2 and 2DL is in gate-dividing state, only has T1 to be two sections of 0.4kV bussed supplies; It is adjustable that total power load S is less than single transformer capacity 500kVA(capacity data daemon software) 70%(thresholding adjustable) time, after exceeding 10 minutes (time is adjustable), select the set preferential transformer of a 500kVA transformer T1() isolated operation realizes economical operation operation.After one 500kVA transformer T1 runs 10 days continuously, carry out automatically switching operation, forward the operating scheme of the 2nd 500kVA transformer T2 isolated operation to.
(2) the 2nd 500kVA transformer T2 isolated operations: now, C2,2DL and 3DL are in "on" position, C1 and 1DL is in gate-dividing state, only have T2 to be two sections of 0.4kV bussed supplies; When total power load meets the first service conditions, the 2nd 500kVA transformer T2 also can isolated operation.After 2nd 500kVA transformer T2 runs 10 days continuously, carry out automatically switching operation, forward the operating scheme of a 500kVA transformer T1 isolated operation to.
(3) the one 500kVA transformer T1 and the 2nd 500kVA transformer T2 split operation: now, C1, C2,1DL and 2DL are in "on" position, 3DL is in gate-dividing state, T1 and T2 is respectively 0.4kV I section of bus and 0.4kV II section of bussed supply, and is mutually disconnect between 0.4kV I section of bus and 0.4kV II section of bus; It is adjustable that total load S is greater than single transformer capacity 500kVA(capacity data daemon software) 80%(thresholding adjustable) after 10 minutes (time is adjustable), carry out two transformer split operations operations.
(4) the one 500kVA transformer T1 and the 2nd 500kVA transformer T2 paired running: now, C1, C2,1DL, 2DL and 3DL are in "on" position, T1 and T2 be 0.4kV I section of bus and 0.4kV II section of bussed supply simultaneously, being interconnective between 0.4kV I section of bus and 0.4kV II section of bus, is parallel connection between T1 and T2; It is adjustable that total load S is greater than two transformer capacity 1000kVA(capacity data daemon softwares) 60%(thresholding adjustable) time, after exceeding 10 minutes (time is adjustable), carry out the operation of two parallel operation of transformers.
Above four kinds of operating schemes are normal operating mode, and other situations are all thought and belonged to abnormal running mode, any automatic control operation of automatic blocking.
In dual transformer system, the control method of two transformer separate unit running state conversions comprises a 500kVA transformer T1 isolated operation state to the transfer process of the 2nd 500kVA transformer T2 isolated operation state and the 2nd 500kVA transformer T2 isolated operation state to the transfer process of a 500kVA transformer T1 isolated operation state;
When M1> accumulated running time, the PT scheduled time of a 500kVA transformer T1 or the 2nd 500kVA transformer T2 stops transport TM2> cumulative time, the PT scheduled time for the last time, electric power system is from a 500kVA transformer T1 isolated operation state to the 2nd 500kVA transformer T2 isolated operation State Transferring; Default scheduled time PT is generally no more than 15 days, generally scheduled time PT is set to 10 days;
One 500kVA transformer T1 isolated operation state to the transfer process of the 2nd 500kVA transformer T2 isolated operation state is:
Step 101: electric power system sends to the second primary cut-out C2 order of closing a floodgate, and the second primary cut-out C2 closes a floodgate successfully and carry out step 102;
Step 102: electric power system sends to the second low-voltage circuit breaker 2DL order of closing a floodgate, and the second low-voltage circuit breaker 2DL closes a floodgate successfully and carry out step 103;
Step 103: electric power system sends separating brake order to the first low-voltage circuit breaker 1DL, carry out step 104 after the first low-voltage circuit breaker 1DL separating brake success;
Step 104: electric power system sends separating brake order to the first primary cut-out C1, carry out step 105 after the first primary cut-out C1 separating brake success;
Step 105: so far, electric power system successful switch to the 2nd 500kVA transformer T2 isolated operation state; According to the total load situation of two transformers, electric power system judges whether current operating conditions is optimum economical operation state; If current operating conditions is optimum economical operation state, keep current operation running status, and start to carry out economical operation status monitoring; If current operating conditions is not optimum economical operation state, then switch from the state that trend is most economical;
When M2> accumulated running time, the PT scheduled time of a 2nd 500kVA transformer T2 or 500kVA transformer T1 stops transport TM1> cumulative time, the PT scheduled time for the last time, electric power system is from the 2nd 500kVA transformer T2 isolated operation state to a 500kVA transformer T1 isolated operation State Transferring; Default scheduled time PT is generally no more than 15 days, generally scheduled time PT is set to 10 days;
2nd 500kVA transformer T2 isolated operation state to the transfer process of a 500kVA transformer T1 isolated operation state is:
Step 201: electric power system sends to the first primary cut-out C1 order of closing a floodgate, and the first primary cut-out C1 closes a floodgate successfully and carry out step 202;
Step 202: electric power system sends to the first low-voltage circuit breaker 1DL order of closing a floodgate, and the first low-voltage circuit breaker 1DL closes a floodgate successfully and carry out step 203;
Step 203: electric power system sends separating brake order to the second low-voltage circuit breaker 2DL, carry out step 204 after the second low-voltage circuit breaker 2DL separating brake success;
Step 204: electric power system sends separating brake order to the second primary cut-out C2, carry out step 205 after the second primary cut-out C2 separating brake success;
Step 205: so far, electric power system successful switch to a 500kVA transformer T1 isolated operation state; According to the total load situation of two transformers, electric power system judges whether current operating conditions is optimum economical operation state; If current operating conditions is optimum economical operation state, keep current operation running status, and start to carry out economical operation status monitoring; If current operating conditions is not optimum economical operation state, then switch from the state that trend is most economical.
In described step 101, after electric power system sends to the second primary cut-out C2 order of closing a floodgate, judge whether the second primary cut-out C2 closes a floodgate successfully according to the on off state of the second primary cut-out C2 again, if the second primary cut-out C2 closes a floodgate successfully, then automatically enter step 102; If the second primary cut-out C2 closes a floodgate unsuccessful, then system sends to the second primary cut-out C2 order of once closing a floodgate again, if the second primary cut-out C2 closes a floodgate successfully, then automatically enters step 102; If the second primary cut-out C2 closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 102, after electric power system sends to the second low-voltage circuit breaker 2DL order of closing a floodgate, judge whether the second low-voltage circuit breaker 2DL closes a floodgate successfully according to the on off state of the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL closes a floodgate successfully, then automatically enter step 103; If the second low-voltage circuit breaker 2DL closes a floodgate unsuccessful, then system sends to the second low-voltage circuit breaker 2DL order of once closing a floodgate again, if the second low-voltage circuit breaker 2DL closes a floodgate successfully, then automatically enters step 103; If the second low-voltage circuit breaker 2DL closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 103, after electric power system sends separating brake order to the first low-voltage circuit breaker 1DL, whether separating brake is successful to judge the first low-voltage circuit breaker 1DL according to the on off state of the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL separating brake success, then automatically enters step 104; If the first low-voltage circuit breaker 1DL separating brake is unsuccessful, then system sends a separating brake order to the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL separating brake success, then automatically enters step 104; If the first low-voltage circuit breaker 1DL separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 104, after electric power system sends separating brake order to the first primary cut-out C1, more whether separating brake is successful to judge the first primary cut-out C1 according to the on off state of the first primary cut-out C1; If the first primary cut-out C1 separating brake success, then enter step 105 automatically; If the first primary cut-out C1 separating brake is unsuccessful, then system sends a separating brake order to the first primary cut-out C1 again, if the first primary cut-out C1 separating brake success, then automatically enters step 105; If the first primary cut-out C1 separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 201, after electric power system sends to the first primary cut-out C1 order of closing a floodgate, then judge whether the first primary cut-out C1 closes a floodgate successfully according to the on off state of the first primary cut-out C1; If the first primary cut-out C1 closes a floodgate successfully, then automatically enter step 202; If the first primary cut-out C1 closes a floodgate unsuccessful, then system sends to the first primary cut-out C1 order of once closing a floodgate again, if the first primary cut-out C1 closes a floodgate successfully, then automatically enters step 202; If the first primary cut-out C1 closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 202, after electric power system sends to the first low-voltage circuit breaker 1DL order of closing a floodgate, judge whether the first low-voltage circuit breaker 1DL closes a floodgate successfully according to the on off state of the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL closes a floodgate successfully, then automatically enter step 203; If the first low-voltage circuit breaker 1DL closes a floodgate unsuccessful, then system sends to the first low-voltage circuit breaker 1DL order of once closing a floodgate again, if the first low-voltage circuit breaker 1DL closes a floodgate successfully, then automatically enters step 203; If the first low-voltage circuit breaker 1DL closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 203, after electric power system sends separating brake order to the second low-voltage circuit breaker 2DL, whether separating brake is successful to judge the second low-voltage circuit breaker 2DL according to the on off state of the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL separating brake success, then automatically enters step 204; If the second low-voltage circuit breaker 2DL separating brake is unsuccessful, then system sends a separating brake order to the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL separating brake success, then automatically enters step 204; If the second low-voltage circuit breaker 2DL separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
In described step 204, after electric power system sends separating brake order to the second primary cut-out C2, whether separating brake is successful to judge the second primary cut-out C2 according to the on off state of the second primary cut-out C2 again, if the second primary cut-out C2 separating brake success, then automatically enters step 205; If the second primary cut-out C2 separating brake is unsuccessful, then system sends a separating brake order to the second primary cut-out C2 again, if the second primary cut-out C2 separating brake success, then automatically enters step 205; If the second primary cut-out C2 separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
The control method of two transformer separate unit running state conversions in dual transformer system of the present invention, the discriminatory analysis ability of major embodiment logic, complicated criterion guarantees system correct operation, system safe, be reliably first-selected, system is by coordinating high and low voltage switch, drop into or excision transformer in the suitable time, change the operational mode of equipment, make transformer be in the state of an economical operation all the time.Energy-conservation is the follow-up considerable added value obtained under being based upon the condition of transformer economic operation.
The control method of two transformer separate unit running state conversions in dual transformer system of the present invention, the parameter used when running status switches has: stop transport for the last time cumulative time TM1, the accumulated running time M2 of the 2nd 500kVA transformer T2, the 2nd 500kVA transformer T2 of the accumulated running time M1 of a 500kVA transformer T1, a 500kVA transformer T1 stops transport cumulative time TM2, the preferential transformer identity MB run for the last time.
Wherein, the accumulated running time M1=M1% predefine largest cumulative time of a 500kVA transformer T1;
One 500kVA transformer T1 stops transport cumulative time TM1=current time-last idle time for the last time;
The accumulated running time M2=M2% predefine largest cumulative time of the 2nd 500kVA transformer T2;
2nd 500kVA transformer T2 stops transport cumulative time TM2=current time-last idle time for the last time;
The transformer identity MB of preferential operation: default value is 1, represents preferential and runs a 500kVA transformer T1, span 1 or 2.During value 2, represent preferential and run the 2nd 500kVA transformer T2.
M1, TM1, M2, TM2, MB are the parameter of Rule of judgment, are all to calculate with said method.
In system automatic control process, if because the appearance of external interference factor, and result in automatic system and cannot normally carry out, then system can stop automatic control flow chart automatically.External interference factor has three kinds usually: 1) human intervention; Such as: switch is closed a floodgate or separating brake on the spot by artificial; 2) switch failure; In the process that automatic control switch switches, exceed the switch failure arranging number of times, this fault is generally caused by the hardware fault of switch own; 3) switch protection action; Because the switch protection separating brake action caused appears instantaneity or permanent fault and in charge circuit.
After automatic control flow chart stops, must having and manually restart automatic control flow chart, thus ensure that the fail safe of the inspection and maintenance work of circuit and equipment.
In dual transformer system of the present invention two transformer separate unit running state conversions control method in, 2 transformers meet paired running condition: the connection set of (1) Transformer Winding must be identical; (2) voltage change ratio must be identical; (3) impedance voltage should be identical or close; (4) capacity can not differ too large; (5) secondary side phase place is identical.
After in power distribution room, transformer meets the demands side by side, 10kV incoming power is that (same transformer station, same 10kV bus, to power distribution room 10kV bussed supply, Fig. 2 is the schematic diagram of dual transformer electric power system to single power supply.
The control method of two transformer separate unit running state conversions in dual transformer system of the present invention, mainly for 2 that put into operation in factories and miness, enterprise and above 10kV distribution transformer, low-voltage power supply system can divide and paired running, automatically transformer making time is regulated according to low-pressure system payload, by the change of running state of transformer, make 2 transformers be in economical operation state all the time, reach the operational mode of control and maximum energy-saving automatically on the spot, save electric energy.By switching manipulation, reasonably optimizing is selected transformer to drop into and is exited, and makes electric power system be in economic operation model all the time.
Claims (9)
1. the control method of two transformer separate unit running state conversions in dual transformer system, it is characterized in that, dual transformer electric power system comprises 10KV bus, the first primary cut-out C1, the second primary cut-out C2, a 500kVA transformer T1, the 2nd 500kVA transformer T2, the first low-voltage circuit breaker 1DL, the second low-voltage circuit breaker 2DL and the 3rd low-voltage circuit breaker 3DL, 0.4kV I section of bus and 0.4kV II section of bus; Be connected by the first primary cut-out C1 between described 10KV bus and a 500kVA transformer T1, be connected by the second primary cut-out C2 between described 10KV bus and the 2nd 500kVA transformer T2; Be connected by the first low-voltage circuit breaker 1DL between described 0.4kV I section of bus and a 500kVA transformer T1, be connected by the second low-voltage circuit breaker 2DL between described 0.4kV II section of bus and the 2nd 500kVA transformer T2; Be connected by the 3rd low-voltage circuit breaker 3DL between described 0.4kV I section of bus and described 0.4kV II section of bus;
Dual transformer electric power system has four kinds of running statuses: a 500kVA transformer T1 isolated operation state, the 2nd 500kVA transformer T2 isolated operation state, two transformer split operation states and two parallel operation of transformers states; Running state parameter in dual transformer electric power system comprises: stop transport for the last time cumulative time TM1, the accumulated running time M2 of the 2nd 500kVA transformer T2, the 2nd 500kVA transformer T2 of the accumulated running time M1 of a 500kVA transformer T1, a 500kVA transformer T1 stops transport cumulative time TM2, the preferential transformer identity MB run for the last time;
Wherein, the accumulated running time M1 of a 500kVA transformer T1;
One 500kVA transformer T1 stops transport the last idle time ST1 of cumulative time TM1=current time-T1 for the last time;
The accumulated running time M2 of the 2nd 500kVA transformer T2;
2nd 500kVA transformer T2 stops transport the last idle time ST2 of cumulative time TM2=current time-T2 for the last time;
The transformer identity MB of preferential operation: default value is 1, represents preferential and runs a 500kVA transformer T1, span 1 or 2;
In dual transformer system, the control method of two transformer separate unit running state conversions comprises a 500kVA transformer T1 isolated operation state to the transfer process of the 2nd 500kVA transformer T2 isolated operation state and the 2nd 500kVA transformer T2 isolated operation state to the transfer process of a 500kVA transformer T1 isolated operation state;
When M1> accumulated running time, the PT scheduled time of a 500kVA transformer T1 or the 2nd 500kVA transformer T2 stops transport TM2> cumulative time, the PT scheduled time for the last time, electric power system is from a 500kVA transformer T1 isolated operation state to the 2nd 500kVA transformer T2 isolated operation State Transferring;
One 500kVA transformer T1 isolated operation state to the transfer process of the 2nd 500kVA transformer T2 isolated operation state is:
Step 101: electric power system sends to the second primary cut-out C2 order of closing a floodgate, and the second primary cut-out C2 closes a floodgate successfully and carry out step 102;
Step 102: electric power system sends to the second low-voltage circuit breaker 2DL order of closing a floodgate, and the second low-voltage circuit breaker 2DL closes a floodgate successfully and carry out step 103;
Step 103: electric power system sends separating brake order to the first low-voltage circuit breaker 1DL, carry out step 104 after the first low-voltage circuit breaker 1DL separating brake success;
Step 104: electric power system sends separating brake order to the first primary cut-out C1, carry out step 105 after the first primary cut-out C1 separating brake success;
Step 105: so far, electric power system successful switch to the 2nd 500kVA transformer T2 isolated operation state; According to the total load situation of two transformers, electric power system judges whether current operating conditions is optimum economical operation state; If current operating conditions is optimum economical operation state, keeps current operating conditions, and start to carry out economical operation status monitoring; If current operating conditions is not optimum economical operation state, then switch from the state that trend is most economical;
When M2> accumulated running time, the PT scheduled time of a 2nd 500kVA transformer T2 or 500kVA transformer T1 stops transport TM1> cumulative time, the PT scheduled time for the last time, electric power system is from the 2nd 500kVA transformer T2 isolated operation state to a 500kVA transformer T1 isolated operation State Transferring;
2nd 500kVA transformer T2 isolated operation state to the transfer process of a 500kVA transformer T1 isolated operation state is:
Step 201: electric power system sends to the first primary cut-out C1 order of closing a floodgate, and the first primary cut-out C1 closes a floodgate successfully and carry out step 202;
Step 202: electric power system sends to the first low-voltage circuit breaker 1DL order of closing a floodgate, and the first low-voltage circuit breaker 1DL closes a floodgate successfully and carry out step 203;
Step 203: electric power system sends separating brake order to the second low-voltage circuit breaker 2DL, carry out step 204 after the second low-voltage circuit breaker 2DL separating brake success;
Step 204: electric power system sends separating brake order to the second primary cut-out C2, carry out step 205 after the second primary cut-out C2 separating brake success;
Step 205: so far, electric power system successful switch to a 500kVA transformer T1 isolated operation state; According to the total load situation of two transformers, electric power system judges whether current operating conditions is optimum economical operation state; If current operating conditions is optimum economical operation state, keeps current operating conditions, and start to carry out economical operation status monitoring; If current operating conditions is not optimum economical operation state, then switch from the state that trend is most economical.
2. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1, it is characterized in that, in described step 101, after electric power system sends to the second primary cut-out C2 order of closing a floodgate, judge whether the second primary cut-out C2 closes a floodgate successfully according to the on off state of the second primary cut-out C2 again, if the second primary cut-out C2 closes a floodgate successfully, then automatically enter step 102; If the second primary cut-out C2 closes a floodgate unsuccessful, then system sends to the second primary cut-out C2 order of once closing a floodgate again, if the second primary cut-out C2 closes a floodgate successfully, then automatically enters step 102; If the second primary cut-out C2 closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
3. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1 and 2, it is characterized in that, in described step 102, after electric power system sends to the second low-voltage circuit breaker 2DL order of closing a floodgate, judge whether the second low-voltage circuit breaker 2DL closes a floodgate successfully according to the on off state of the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL closes a floodgate successfully, then automatically enter step 103; If the second low-voltage circuit breaker 2DL closes a floodgate unsuccessful, then system sends to the second low-voltage circuit breaker 2DL order of once closing a floodgate again, if the second low-voltage circuit breaker 2DL closes a floodgate successfully, then automatically enters step 103; If the second low-voltage circuit breaker 2DL closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
4. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1, it is characterized in that, in described step 103, after electric power system sends separating brake order to the first low-voltage circuit breaker 1DL, whether separating brake is successful to judge the first low-voltage circuit breaker 1DL according to the on off state of the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL separating brake success, then enter step 104 automatically; If the first low-voltage circuit breaker 1DL separating brake is unsuccessful, then system sends a separating brake order to the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL separating brake success, then automatically enters step 104; If the first low-voltage circuit breaker 1DL separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
5. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1, it is characterized in that, in described step 104, after electric power system sends separating brake order to the first primary cut-out C1, more whether separating brake is successful to judge the first primary cut-out C1 according to the on off state of the first primary cut-out C1; If the first primary cut-out C1 separating brake success, then enter step 105 automatically; If the first primary cut-out C1 separating brake is unsuccessful, then system sends a separating brake order to the first primary cut-out C1 again, if the first primary cut-out C1 separating brake success, then automatically enters step 105; If the first primary cut-out C1 separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
6. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1 and 2, it is characterized in that, in described step 201, after electric power system sends to the first primary cut-out C1 order of closing a floodgate, then judge whether the first primary cut-out C1 closes a floodgate successfully according to the on off state of the first primary cut-out C1; If the first primary cut-out C1 closes a floodgate successfully, then automatically enter step 202; If the first primary cut-out C1 closes a floodgate unsuccessful, then system sends to the first primary cut-out C1 order of once closing a floodgate again, if the first primary cut-out C1 closes a floodgate successfully, then automatically enters step 202; If the first primary cut-out C1 closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
7. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1 and 2, it is characterized in that, in described step 202, after electric power system sends to the first low-voltage circuit breaker 1DL order of closing a floodgate, judge whether the first low-voltage circuit breaker 1DL closes a floodgate successfully according to the on off state of the first low-voltage circuit breaker 1DL again, if the first low-voltage circuit breaker 1DL closes a floodgate successfully, then automatically enter step 203; If the first low-voltage circuit breaker 1DL closes a floodgate unsuccessful, then system sends to the first low-voltage circuit breaker 1DL order of once closing a floodgate again, if the first low-voltage circuit breaker 1DL closes a floodgate successfully, then automatically enters step 203; If the first low-voltage circuit breaker 1DL closes a floodgate also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
8. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1 and 2, it is characterized in that, in described step 203, after electric power system sends separating brake order to the second low-voltage circuit breaker 2DL, whether separating brake is successful to judge the second low-voltage circuit breaker 2DL according to the on off state of the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL separating brake success, then enter step 204 automatically; If the second low-voltage circuit breaker 2DL separating brake is unsuccessful, then system sends a separating brake order to the second low-voltage circuit breaker 2DL again, if the second low-voltage circuit breaker 2DL separating brake success, then automatically enters step 204; If the second low-voltage circuit breaker 2DL separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
9. the control method of two transformer separate unit running state conversions in dual transformer system according to claim 1, it is characterized in that, in described step 204, after electric power system sends separating brake order to the second primary cut-out C2, whether separating brake is successful to judge the second primary cut-out C2 according to the on off state of the second primary cut-out C2 again, if the second primary cut-out C2 separating brake success, then enter step 205 automatically; If the second primary cut-out C2 separating brake is unsuccessful, then system sends a separating brake order to the second primary cut-out C2 again, if the second primary cut-out C2 separating brake success, then automatically enters step 205; If the second primary cut-out C2 separating brake is also unsuccessful, then send warning information, stop the operation of automatic control flow chart.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255338A (en) * | 2011-08-19 | 2011-11-23 | 青岛特锐德电气股份有限公司 | Transformer automatic switching device for power transmission system |
| CN202218024U (en) * | 2011-07-07 | 2012-05-09 | 楼晓春 | Parallel power distribution economic operation system |
| CN103023031A (en) * | 2013-01-07 | 2013-04-03 | 王财勇 | Low-voltage six-phase power distribution system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100460996B1 (en) * | 2002-11-05 | 2004-12-09 | 주식회사 케이디파워 | Parallel opperating apparatus of transformer using a load factor and Parallel operating control system thereof |
| JP2007244138A (en) * | 2006-03-10 | 2007-09-20 | Chugoku Electric Power Co Inc:The | Protective circuit |
| KR101300752B1 (en) * | 2012-07-13 | 2013-08-28 | 주식회사 현태 | Low voltage distributing board system and power supply controller on low voltage distributing board |
-
2013
- 2013-11-29 CN CN201310632918.3A patent/CN103595055B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202218024U (en) * | 2011-07-07 | 2012-05-09 | 楼晓春 | Parallel power distribution economic operation system |
| CN102255338A (en) * | 2011-08-19 | 2011-11-23 | 青岛特锐德电气股份有限公司 | Transformer automatic switching device for power transmission system |
| CN103023031A (en) * | 2013-01-07 | 2013-04-03 | 王财勇 | Low-voltage six-phase power distribution system |
Non-Patent Citations (5)
| Title |
|---|
| Equal Current Distribution in Parallel Circuits of Resistive Superconducting Fault Current Limiters Using Multiple Superconducting Inter-Phase Transformers;Jungwook Sim et al.;《IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY》;20050630;第15卷(第2期);第2122-2125页 * |
| The 4×6 NETWORK: UPGRADE OF A MAJOR 500KV SUBSTATION;Ronald Page et al.;《IEEE Transactions on Power Delivery》;19910430;第6卷(第2期);第626-632页 * |
| 厂用工作电源与备用电源的正常切换方式探讨;陈洪利等;《电力建设》;20060930;第27卷(第9期);第56-59页 * |
| 浅谈变压器倒闸操作;孙兰等;《矿业快报》;20060930(第9期);第81-82页 * |
| 配网并列变压器经济运行的实例分析;霍宇等;《自动化应用》;20121231(第6期);第65-66页 * |
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