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Modifying method of transformer overcurrent relay protection

A relay protection and transformer technology, applied in the electronic field, can solve the problems that the current release cannot be started normally, and the overcurrent protection cannot be performed.

Inactive Publication Date: 2013-12-18
洛阳恒光特种变压器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a single transformer is running, its fixed values ​​are 60A and 130A respectively, and the converted secondary values ​​are 2A and 4.3A respectively, and the current release with a rated value of 5A cannot be started normally, so it cannot play the role of overcurrent protection.

Method used

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  • Modifying method of transformer overcurrent relay protection
  • Modifying method of transformer overcurrent relay protection
  • Modifying method of transformer overcurrent relay protection

Examples

Experimental program
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Effect test

Embodiment 1

[0017] exist figure 1 In , the dotted line is short-circuited, and the primary windings of the saturated converters of the intermediate relays 1ZJ and 2ZJ are still connected to the current loop, which is figure 2 Provide power to ensure the normal operation of the signal circuit. For this purpose, add an intermediate relay ZJ, see image 3 In the middle and upper dotted lines, after the current relays 3LJ and 4LJ act, the normally closed contacts close, the SJ coil power is disconnected, the SJ contacts close after a delay, and the start signal relay 2XJ, its first pair of normally open contacts close, giving At the same time, close the second pair of normally open contacts, connect them to the ZJ coil circuit, close the ZJ normally open contacts, connect the TQ circuit, and trip the vacuum circuit breaker.

[0018] After checking the product manual, 2XJ is DX31B type, the contact can switch the capacity of 100VA, ZJ and 4ZJ are the same type D252 type, the coil ca...

Embodiment 2

[0020] Embodiment 2 (preferred scheme)

[0021] No adjustment is made to Figure 1, so that the quick-break protection is still tripped by the current release, and the figure 2 The over-current protection circuit (dotted line) in the circuit is cancelled, and the over-current protection function is moved to image 3 realized in. See image 3 The lower dotted line in the image 3 Add an intermediate relay ZJ in the middle, after the overcurrent signal is generated, the 3LJ and 4U normally closed contacts are disconnected, the SJ coil is de-energized, the contact is closed after a delay, the ZJ coil is connected, and a pair of ZJ normally open contacts are connected together The two ends of the shunt button are used to realize over-current tripping; the other pair of normally open contacts are connected to the 2XJ coil at the same time to realize the alarm function. It should be noted that here, the model of the signal relay 2XJ needs to be replaced, in figure 2 is...

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PUM

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Abstract

Disclosed is a modifying method of transformer overcurrent relay protection. Due to the fact that a current relay can act normally and a current release cannot reach rated current to operate normally. The principle is that the tasks after actions of the current relay are executed by a voltage release. In order to achieve the purpose, secondary line is adjusted, and two modification schemes are provided.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an improved method for transformer overcurrent relay protection. Background technique [0002] One of the outgoing lines of a 10kV substation has two S9 transformers with a capacity of 630kVA and 1250kVA. Different operation modes can be selected according to the special requirements of the production process: 630kVA transformers are operated alone at light loads; 1250kVA transformers are operated at medium loads ; Two transformers run together at full load. This led to the adjustment of the relay protection mode. [0003] According to the protection setting value provided by the power company, when the 630kVA transformer is operated alone, its protection setting is 60A for overcurrent and 250A for quick break; when the 1250kVA transformer is operated alone, its protection setting is 130A for overcurrent and 460A for quick break; when two sets are put into operation, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04
Inventor 孙民
Owner 洛阳恒光特种变压器有限公司
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