High-voltage switchgear current transformer ratio polarity test rapid debugging structure and method

Abstract

A rapid debugging structure and method for testing the polarity of current transformers in high-voltage switchgear involves connecting the upper ends of a first circuit breaker and a second circuit breaker to the same busbar. Phase A at the lower primary end of the first current transformer is connected to phase B at the lower primary end of the second current transformer. Phase B at the lower primary end of the first current transformer is connected to phase C at the lower primary end of the second current transformer. Phase C at the lower primary end of the first current transformer is connected to one end of the AC output of a current generator, while phase A at the lower primary end of the second current transformer is connected to the other end of the AC output of the current generator. This method fully utilizes the components within the high-voltage switchgear cabinet and connects the six current transformers of any two adjacent high-voltage switchgear cabinets in series via circuit breakers and busbars, ensuring the integrity of the current transformer current loop. This eliminates the need for repeated disassembly and assembly of interphase insulation partitions, improving efficiency when applying current between two high-voltage switchgear cabinets.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformer testing, and in particular to a rapid debugging structure and method for a current transformer ratio polarity test of a high-voltage switch cabinet. Background Art

[0002] Current transformers are very important measurement and protection equipment in high-voltage switchgear, so checking their ratio polarity is particularly important. However, since current transformers in high-voltage switchgear often have insulating partitions between the three phases to ensure a safe distance, it is difficult to perform current transformer ratio polarity tests. If a test is to be performed, the insulating partitions must be disassembled, which is both time-consuming and laborious. Based on this, a debugging structure was considered that not only utilizes existing instruments and equipment but can also quickly complete the ratio polarity test. After careful study, it was found that if the circuit breakers of two adjacent high-voltage switchgears are turned to the working position and closed, one end of the two current transformers in each phase is connected together, and then two short-circuit wires are connected at the feed end of the two high-voltage switchgears to connect the six current transformers of the two high-voltage switchgears in series, without having to consider the problem of disassembling and assembling the insulating partitions. Summary of the Invention

[0003] In order to solve the technical problems in the background technology, the present invention provides a high-voltage switch cabinet current transformer ratio polarity test rapid debugging structure and method, which is simple to operate and easy to master, greatly improving work efficiency.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A rapid debugging structure for a current transformer ratio polarity test in a high-voltage switchgear cabinet is disclosed. The debugging structure comprises a current generator, a first circuit breaker, a second circuit breaker, a first current transformer, and a second current transformer. The upper ends of the first circuit breaker and the second circuit breaker are respectively connected to the same busbar, the upper end of the primary side of the first current transformer is connected to the lower end of the first circuit breaker, and the upper end of the primary side of the second current transformer is connected to the lower end of the second circuit breaker.

[0006] Phase A at the lower end of the primary side of the first current transformer is connected to phase B at the lower end of the primary side of the second current transformer, phase B at the lower end of the primary side of the first current transformer is connected to phase C at the lower end of the primary side of the second current transformer, phase C at the lower end of the primary side of the first current transformer is connected to one end of the AC output end of the current generator, and phase A at the lower end of the primary side of the second current transformer is connected to the other end of the AC output end of the current generator.

[0007] A rapid debugging method for a current transformer ratio polarity test of a high-voltage switchgear comprises the following steps:

[0008] 1) Move the circuit breakers of any two adjacent high-voltage switch cabinets to the working position and close them. Short-circuit the A phase of the current transformer of the first cabinet with the B phase of the current transformer of the second cabinet, and short-circuit the B phase of the current transformer of the first cabinet with the C phase of the current transformer of the second cabinet. In this way, the six current transformers of the two cabinets are connected in series to ensure that the current transformer current circuit is complete;

[0009] 2) Connect the AC current output of a large current generator or other current source to phase C of the current transformer in the first cabinet and phase A of the current transformer in the second cabinet, and then apply an appropriate current I1 according to the transformation ratio of the current transformer;

[0010] 3) Read the current I2 on the integrated protection of the two high-voltage switchgear respectively, or clamp the clamp ammeter on the secondary side of the current transformer of the high-voltage switchgear to measure the secondary side current I2 of the current transformer;

[0011] 4) After completing the above steps, calculate the current transformer ratio K of the high-voltage switchgear. The calculation method is:

[0012] K=I1 / I2

[0013] Where: I1 is the primary side current of the high-voltage switchgear; I2 is the secondary side current of the current transformer; K is the transformation ratio of the current transformer.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The structure and method described in this invention utilize the circuit breaker and busbars of a high-voltage switchgear to connect current transformers in series. Appropriate current is then applied to the current transformers at the output end of the high-voltage switchgear. This eliminates the need for repeated disassembly and assembly of interphase insulating barriers and improves efficiency when applying current between two high-voltage switchgears, saving time, particularly when multiple high-voltage switchgears are involved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a quick debugging structure diagram of the current transformer ratio polarity test of the high-voltage switch cabinet in the prior art;

[0017] Figure 2 The present invention is a diagram of a quick debugging structure for a current transformer ratio polarity test of a high-voltage switch cabinet.

[0018] In the figure: 1 - current generator 2 - circuit breaker 2 - 1 - first circuit breaker 2 - 2 - second circuit breaker 3 - current transformer 3 - 1 - first current transformer 3 - 2 - second current transformer 4 - insulating partition. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, according to the conventional debugging structure, the interphase insulating partition must be removed first, and then the A-phase tail end of the current transformer 3 is short-circuited with the B-phase head end, and the B-phase tail end is short-circuited with the C-phase head end. A current generator 1 is added between the A-phase head end and the C-phase tail end to perform a transformation ratio polarity test, and finally the insulating partition is restored.

[0021] like Figure 2 As shown, a rapid debugging structure for a current transformer ratio polarity test of a high-voltage switchgear of the present invention is provided. The components of the debugging structure include a current generator 1, a first circuit breaker 2-1, a second circuit breaker 2-2, a first current transformer 3-1, and a second current transformer 3-2. The first current transformer 3-1 and the second current transformer 3-2 are both three-phase current transformers. The upper ends of the first circuit breaker 2-1 and the second circuit breaker 2-2 are respectively connected to the same busbar, the upper end of the primary side of the first current transformer 3-1 is connected to the lower end of the first circuit breaker 2-1, and the upper end of the primary side of the second current transformer 3-2 is connected to the lower end of the second circuit breaker 2-2.

[0022] The A phase at the lower end of the primary side of the first current transformer 3-1 is connected to the B phase at the lower end of the primary side of the second current transformer 3-2, the B phase at the lower end of the primary side of the first current transformer 3-1 is connected to the C phase at the lower end of the primary side of the second current transformer 3-2, the C phase at the lower end of the primary side of the first current transformer 3-1 is connected to one end of the AC output end of the current generator 1, and the A phase at the lower end of the primary side of the second current transformer 3-2 is connected to the other end of the AC output end of the current generator 3.

[0023] The secondary side connection methods of the first current transformer 3-1 and the second current transformer 3-2 are the same as those of conventional technologies, and are connected to the comprehensive protection device of the high-voltage switchgear, and test data is read through the comprehensive protection device.

[0024] A rapid debugging method for a current transformer ratio polarity test of a high-voltage switchgear comprises the following steps:

[0025] 1) Move the circuit breakers of any two adjacent high-voltage switch cabinets to the working position and close them. Short-circuit the A phase of the current transformer of the first cabinet with the B phase of the current transformer of the second cabinet, and short-circuit the B phase of the current transformer of the first cabinet with the C phase of the current transformer of the second cabinet. In this way, the six current transformers of the two cabinets are connected in series to ensure that the current transformer current circuit is complete;

[0026] 2) Connect the AC current output of a large current generator or other current source to phase C of the current transformer in the first cabinet and phase A of the current transformer in the second cabinet, and then apply an appropriate current I1 according to the transformation ratio of the current transformer;

[0027] 3) Read the current I2 on the integrated protection of the two high-voltage switchgear respectively, or clamp the clamp ammeter on the secondary side of the current transformer of the high-voltage switchgear to measure the secondary side current I2 of the current transformer;

[0028] 4) After completing the above steps, calculate the current transformer ratio K of the high-voltage switchgear. The calculation method is:

[0029] K=I1 / I2

[0030] Where: I1 is the primary side current of the high-voltage switchgear; I2 is the secondary side current of the current transformer; K is the transformation ratio of the current transformer.

[0031] The debugging structure of the present invention fully utilizes the components inside the high-voltage switch cabinet. The circuit breakers of any two adjacent high-voltage switch cabinets are moved to the working position and closed. The heads of the current transformers of each phase are connected through the busbar. Then, the A phase of the current transformer at the feed end of the first cabinet is short-circuited with the B phase of the current transformer at the feed end of the second cabinet. The B phase of the current transformer at the feed end of the first cabinet is short-circuited with the C phase of the current transformer at the feed end of the second cabinet. In this way, the six current transformers of the two cabinets are connected in series, ensuring that the current circuit of the current transformers is complete.

[0032] Connect the AC current output end of a large current generator or other current source to the C phase of the current transformer at the first cabinet feed end and the A phase of the current transformer at the second cabinet feed end, and then add appropriate current according to the transformation ratio of the current transformer to quickly measure the transformation ratio and polarity of the high-voltage switch cabinet current transformer.

[0033] The debugging structure described in this invention utilizes the circuit breakers and busbars of a high-voltage switchgear to connect current transformers in series. Appropriate current is then applied to the current transformers at the output end of the high-voltage switchgear. This eliminates the need for repeated disassembly and assembly of interphase insulating barriers. Furthermore, applying current between two high-voltage switchgear cabinets improves efficiency, saving time, especially when multiple high-voltage switchgear cabinets are in operation.

[0034] The above embodiments are implemented under the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A rapid debugging method for a rapid debugging structure of a current transformer ratio polarity test in a high-voltage switchgear, wherein the debugging structure comprises a current generator and is characterized in that: It also includes a first circuit breaker, a second circuit breaker, a first current transformer, and a second current transformer; the upper ends of the first circuit breaker and the second circuit breaker are respectively connected to the same busbar, the upper end of the primary side of the first current transformer is connected to the lower end of the first circuit breaker, and the upper end of the primary side of the second current transformer is connected to the lower end of the second circuit breaker; Phase A at the lower end of the primary side of the first current transformer is connected to phase B at the lower end of the primary side of the second current transformer, phase B at the lower end of the primary side of the first current transformer is connected to phase C at the lower end of the primary side of the second current transformer, phase C at the lower end of the primary side of the first current transformer is connected to one end of the AC output terminal of the current generator, and phase A at the lower end of the primary side of the second current transformer is connected to the other end of the AC output terminal of the current generator; It is characterized in that the rapid debugging method comprises the following steps: 1) Move the circuit breakers of any two adjacent high-voltage switchgear cabinets to the working position and close them. Short-circuit the A phase of the current transformer of the first cabinet with the B phase of the current transformer of the second cabinet, and short-circuit the B phase of the current transformer of the first cabinet with the C phase of the current transformer of the second cabinet. In this way, the six current transformers of the two cabinets are connected in series to ensure that the current transformer current circuit is complete; 2) Connect the AC current output terminal of the large current generator to the C phase of the current transformer of the first cabinet and the A phase of the current transformer of the second cabinet, and then add an appropriate current I1 according to the transformation ratio of the current transformer; 3) Read the current I2 on the integrated protection of the two high-voltage switchgear respectively, or clamp the clamp ammeter on the secondary side of the current transformer of the high-voltage switchgear to measure the secondary side current I2 of the current transformer; 4) After completing the above steps, calculate the current transformer ratio K of the high-voltage switchgear. The calculation method is: K=I1 / I2 Where: I1 is the primary side current of the high-voltage switchgear; I2 is the secondary side current of the current transformer; K is the transformation ratio of the current transformer.

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