该装置具有消除 PT 饱和谐振和限制涌流2种功能，但在应用中存在局限性：①中性点为半绝缘结构,只能直接接地安装的PT无法使用；②只能限制本PT不发生谐振，对电网中的其他PT无效（仅一对一有效）；③当发生单相接地故障时，PT零序电压U０的测量值有误差,因此不适宜使用在对U0幅值和角度精度要求较高的场合（如微机接地选线装置）；④装置自身的热容量有限，即使选用热容量相对较大的LXQ型一次消谐阻尼器，在持续时间较长的间歇电弧接地过电压激发下，仍可损坏装置。一次消谐阻尼器较适用于JDZJ等型号中性点全绝缘PT的消谐改造。
The device has two functions of eliminating Pt saturation resonance and limiting inrush current, but there are limitations in its application: ① the neutral point is semi insulated structure, and the PT installed by direct grounding can not be used; ② it can only limit the Pt from resonance, which is invalid for other Pt in the power grid (only one-to-one); ③ when single-phase grounding fault occurs, the measurement value of Pt zero sequence voltage U0 has errors, so It is not suitable to be used in occasions with high requirements for U0 amplitude and angle accuracy (such as microcomputer grounding line selection device); ④ the thermal capacity of the device itself is limited, even if lxq type primary harmonic elimination damper with relatively large thermal capacity is selected, the device can still be damaged under the excitation of intermittent arc grounding overvoltage with long duration. The primary harmonic elimination damper is suitable for the modification of jdzj neutral point full insulation Pt.